Merge branch 'feat-private-messages' into 'main'

Private messages Closes #496 See merge request framasoft/mobilizon!1477
2023-11-20 16:58:20 +00:00 · 2023-11-20 16:58:20 +00:00 · dcfcf066f9
parent 074099a36e 7ef85fe19b
commit dcfcf066f9
676 changed files with 17527 additions and 9061 deletions
--- a/js/.browserslistrc
+++ b/js/.browserslistrc
--- a/.credo.exs
+++ b/.credo.exs
@ -22,7 +22,7 @@
        # In the latter case `**/*.{ex,exs}` will be used.
        #
        included: ["lib/", "src/", "test/"],
-        excluded: [~r"/_build/", ~r"/deps/", ~r"/js/"]
+        excluded: [~r"/_build/", ~r"/deps/", ~r"/src/"]
      },
      #
      # If you create your own checks, you must specify the source files for
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@ -1,44 +1,46 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
 // https://github.com/microsoft/vscode-dev-containers/tree/v0.209.6/containers/elixir-phoenix-postgres
 {
-	"name": "Elixir, Phoenix, Node.js & PostgresSQL (Community)",
-	"dockerComposeFile": "docker-compose.yml",
-	"service": "elixir",
-	"workspaceFolder": "/workspace",
+  "name": "Elixir, Phoenix, Node.js & PostgresSQL (Community)",
+  "dockerComposeFile": "docker-compose.yml",
+  "service": "elixir",
+  "workspaceFolder": "/workspace",

-	// Set *default* container specific settings.json values on container create.
-	"settings": {
-		"sqltools.connections": [{
-			"name": "Container database",
-			"driver": "PostgreSQL",
-			"previewLimit": 50,
-			"server": "localhost",
-			"port": 5432,
-			"database": "postgres",
-			"username": "postgres",
-			"password": "postgres"
-		}]
-	},
+  // Set *default* container specific settings.json values on container create.
+  "settings": {
+    "sqltools.connections": [
+      {
+        "name": "Container database",
+        "driver": "PostgreSQL",
+        "previewLimit": 50,
+        "server": "localhost",
+        "port": 5432,
+        "database": "postgres",
+        "username": "postgres",
+        "password": "postgres"
+      }
+    ]
+  },

-	// Add the IDs of extensions you want installed when the container is created.
-	"extensions": [
-		"jakebecker.elixir-ls",
-		"mtxr.sqltools",
-		"mtxr.sqltools-driver-pg"
-	],
+  // Add the IDs of extensions you want installed when the container is created.
+  "extensions": [
+    "jakebecker.elixir-ls",
+    "mtxr.sqltools",
+    "mtxr.sqltools-driver-pg"
+  ],

-	// Use 'forwardPorts' to make a list of ports inside the container available locally.
-	"forwardPorts": [4000, 4001, 5432],
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  "forwardPorts": [4000, 4001, 5432],

-	// Use 'postCreateCommand' to run commands after the container is created.
-	// "postCreateCommand": "mix deps.get",
-	// "runArgs": ["--userns=keep-id", "--privileged"],
-	// "containerUser": "vscode",
-	// "containerEnv": {
-	// 	"HOME": "/home/vscode",
-	// },
-	// "workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind,Z",
+  // Use 'postCreateCommand' to run commands after the container is created.
+  // "postCreateCommand": "mix deps.get",
+  // "runArgs": ["--userns=keep-id", "--privileged"],
+  // "containerUser": "vscode",
+  // "containerEnv": {
+  // 	"HOME": "/home/vscode",
+  // },
+  // "workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind,Z",

-	// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
-	"remoteUser": "vscode"
+  // Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
+  "remoteUser": "vscode"
 }
--- a/.dockerignore
+++ b/.dockerignore
@ -15,5 +15,5 @@ Makefile
 README.md
 SECURITY.md
 ssh_match_hostname
-.js/package-lock.json
-js/node_modules
+package-lock.json
+node_modules
--- a/js/.editorconfig
+++ b/js/.editorconfig
--- a/js/.eslintrc.js
+++ b/js/.eslintrc.js
--- a/.gitignore
+++ b/.gitignore
@ -46,7 +46,14 @@ release/
 .weblate
 docker/production/.env
 test-junit-report.xml
-js/junit.xml
+junit.xml
 .env
 demo/
 codeclimate.json
+
+node_modules
+stats.html
+/coverage
+/playwright-report/
+.histoire
+
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@ -13,7 +13,6 @@ stages:

 variables:
  MIX_ENV: "test"
-  YARN_CACHE_FOLDER: "js/.yarn"
  # DB Variables for Postgres / Postgis
  POSTGRES_DB: mobilizon_test
  POSTGRES_USER: postgres
@ -38,8 +37,8 @@ cache:
  paths:
    - deps/
    - _build/
-    - js/node_modules
-    - js/.yarn
+    - node_modules
+    - .npm

 # Installed dependencies are cached across the pipeline
 # So there is no need to reinstall them all the time
@ -47,7 +46,7 @@ cache:
 install:
  stage: install
  script:
-    - yarn --cwd "js" install --frozen-lockfile
+    - npm ci
    - mix deps.get
    - mix compile

@ -68,27 +67,26 @@ lint-elixir:
    reports:
      codequality: codeclimate.json

-
 lint-front:
-  image: node:16
+  image: node:20
  stage: check
  before_script:
    - export EXITVALUE=0
-    - yarn --cwd "js" install --frozen-lockfile
+    - npm ci
  script:
-    - yarn --cwd "js" run lint || export EXITVALUE=1
-    - yarn --cwd "js" run prettier -c . || export EXITVALUE=1
+    - npm run lint || export EXITVALUE=1
+    - npx prettier -c . || export EXITVALUE=1
    - exit $EXITVALUE

 build-frontend:
  stage: build-js
-  image: node:16
+  image: node:20
  before_script:
    - apt update
-    - apt install -y --no-install-recommends python build-essential webp imagemagick gifsicle jpegoptim optipng pngquant
+    - apt install -y --no-install-recommends python3 build-essential webp imagemagick gifsicle jpegoptim optipng pngquant
  script:
-    - yarn --cwd "js" install --frozen-lockfile
-    - yarn --cwd "js" run build
+    - npm install --frozen-lockfile
+    - npm run build
  artifacts:
    expire_in: 5 days
    paths:
@ -118,7 +116,7 @@ deps:
  script:
    - export EXITVALUE=0
    - mix hex.outdated || export EXITVALUE=1
-    - yarn --cwd "js" outdated || export EXITVALUE=1
+    - npm outdated || export EXITVALUE=1
    - exit $EXITVALUE
  allow_failure: true
  needs:
@ -151,16 +149,16 @@ vitest:
  needs:
    - lint-front
  before_script:
-    - yarn --cwd "js" install --frozen-lockfile
+    - npm install --frozen-lockfile
  script:
-    - yarn --cwd "js" run coverage --reporter=default --reporter=junit --outputFile.junit=./junit.xml
+    - npm run coverage --reporter=default --reporter=junit --outputFile.junit=./junit.xml
  artifacts:
    when: always
    paths:
-      - js/coverage
+      - coverage
    reports:
      junit:
-        - js/junit.xml
+        - junit.xml
    expire_in: 30 days

 e2e:
@ -175,21 +173,20 @@ e2e:
    - mix ecto.create
    - mix ecto.migrate
    - mix run priv/repo/e2e.seed.exs
-    - cd js && yarn install && yarn run build && npx playwright install && cd ../
+    - npm install && npm run build && npx playwright install
    - mix phx.digest
  script:
    - mix phx.server &
-    - cd js
    - npx wait-on http://localhost:4000
    - npx playwright test --project $BROWSER
  parallel:
    matrix:
-      - BROWSER: ['firefox', 'chromium']
+      - BROWSER: ["firefox", "chromium"]
  artifacts:
    expire_in: 2 days
    paths:
-      - js/playwright-report/
-      - js/test-results/
+      - playwright-report/
+      - test-results/

 pages:
  stage: deploy
@ -198,8 +195,8 @@ pages:
    - mix deps.get
    - mix docs
    - mv doc public/backend
-  #     #- yarn run --cwd "js" styleguide:build
-  #     #- mv js/styleguide public/frontend
+  #     #- npm run styleguide:build
+  #     #- mv styleguide public/frontend
  rules:
    - if: '$CI_COMMIT_BRANCH == "main"'
  artifacts:
@ -270,7 +267,6 @@ build-and-push-to-latest-docker-tag:
      - ARCH: ["arm64"]
        ERL_FLAGS: ["ERL_FLAGS=+JMsingle true"]

-
 # Don't push to latest when building beta/rc tags
 build-and-push-docker-tag:
  <<: *docker
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@ -1,4 +1,3 @@
 #!/usr/bin/env sh
 . "$(dirname -- "$0")/_/husky.sh"
-cd js
-yarn run lint-staged
+npm run pre-commit
--- a/.prettierignore
+++ b/.prettierignore
@ -0,0 +1,4 @@
+src/i18n/*.json
+coverage/
+**/*.md
+test/fixtures
--- a/js/.prettierrc.json
+++ b/js/.prettierrc.json
--- a/.sobelow-skips
+++ b/.sobelow-skips
@ -3,18 +3,18 @@
 1C29EE70E90ECED01AF28EC58D2575B5
 31CE26BC979C57B9E3CC97B40C290CE5
 3529E7A4CECC24D02678820E6F521162
-4A4B7002DEB734A943B467DF7D2BD1AA
+37E854EA3BDF7275C6A7631F80804EC4
 4E7C044C59E0BCB76AA826789998F624
 53CBBEB6243FAF5C37249CBA17DE6F4C
 5BCE3651A03711295046DE48BDFE007E
+5C16A2AE6A24E4795F95DDE20EEC458E
+5C4CED447689F00D9D1ACEB9B895ED29
 630C0972985257251EDF89A7117DE423
-8274AF29B81EC7CF7F585D5EED8A64E1
 94ACF7B17C3FF42F64E57DD1DA936BD8
 A32E125003F1EDFAD95C487C6A969725
 ACF6272A1DBB3A2ABD96C0C120B5CA69
 C46C4893B2F702ACADC4CAA5683FE370
 CDF2CCE0CF10F49CDFAE22FE26208155
 E720CB13C50FF3ADEE7C522531E11217
-E8FC5F2C5DEA6671BA596B022C4FE6F2
 F3D5851D3FB050939841ED2F14307A27
 FD1C9756370A195B74E95CE504C45E9E
--- a/2
+++ b/2
@ -1,6 +1,6 @@
 FROM elixir:alpine

-RUN apk add --no-cache inotify-tools postgresql-client yarn file make gcc libc-dev argon2 imagemagick cmake build-base libwebp-tools bash ncurses git python3
+RUN apk add --no-cache inotify-tools postgresql-client file make gcc libc-dev argon2 imagemagick cmake build-base libwebp-tools bash ncurses git python3

 RUN mix local.hex --force && mix local.rebar --force

--- a/3
+++ b/3
@ -4,7 +4,7 @@ init:

 setup: stop
 	@bash docker/message.sh "Compiling everything"
-	docker-compose run --rm api bash -c 'mix deps.get; yarn --cwd "js"; yarn --cwd "js" build:pictures; mix ecto.create; mix ecto.migrate'
+	docker-compose run --rm api bash -c 'mix deps.get; npm ci; npm run build:pictures; mix ecto.create; mix ecto.migrate'
 migrate:
 	docker-compose run --rm api mix ecto.migrate
 logs:
@ -19,6 +19,7 @@ stop:
 	@bash docker/message.sh "Mobilizon is stopped"
 test: stop
 	@bash docker/message.sh "Running tests"
+	docker-compose -f docker-compose.yml -f docker-compose.test.yml run api mix prepare_test
 	docker-compose -f docker-compose.yml -f docker-compose.test.yml run api mix test $(only)
 	@bash docker/message.sh "Done running tests"
 format: 
--- a/apollo.config.js
+++ b/apollo.config.js
@ -7,6 +7,6 @@ module.exports = {
      localSchemaFile: "./schema.graphql",
    },
    // Files processed by the extension
-    includes: ["js/src/**/*.vue", "js/src/**/*.js"],
+    includes: ["src/**/*.vue", "src/**/*.js"],
  },
 };
--- a/config/dev.exs
+++ b/config/dev.exs
@ -15,8 +15,7 @@ config :mobilizon, Mobilizon.Web.Endpoint,
  check_origin: false,
  watchers: [
    node: [
-      "node_modules/.bin/vite",
-      cd: Path.expand("../js", __DIR__)
+      "node_modules/.bin/vite"
    ]
  ]

--- a/config/e2e.exs
+++ b/config/e2e.exs
@ -16,7 +16,7 @@ config :mobilizon, Mobilizon.Web.Endpoint,
  check_origin: false,
  # Somehow this can't be merged properly with the dev config so we got this…
  watchers: [
-    yarn: [cd: Path.expand("../js", __DIR__)]
+    npm: []
  ]

 config :vite_phx,
--- a/docker-compose.test.yml
+++ b/docker-compose.test.yml
@ -11,7 +11,7 @@ services:
      MIX_ENV: "test"
      MOBILIZON_DATABASE_DBNAME: mobilizon_test
      MOBILIZON_INSTANCE_HOST: mobilizon.test
-    command: "mix test"
+    command: "mix prepare_test && mix test"
 volumes:
  pgdata:
  .:
--- a/docker/multiarch/Dockerfile
+++ b/docker/multiarch/Dockerfile
@ -18,9 +18,8 @@ ENV NODE_VERSION 18
 RUN apt-get update -yq && apt-get install -yq build-essential cmake postgresql-client git curl gnupg unzip exiftool webp imagemagick gifsicle
 RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

-# # Install Node & yarn
+# # Install Node
 # RUN curl -sL https://deb.nodesource.com/setup_16.x | bash && apt-get install nodejs -yq
-# RUN npm install -g yarn

 # Install build tools
 RUN source /root/.bashrc && \
@ -32,8 +31,8 @@ COPY ./ /mobilizon
 WORKDIR /mobilizon

 # # Build front-end
-# RUN yarn --cwd "js" install --frozen-lockfile
-# RUN yarn --cwd "js" run build
+# RUN npm install
+# RUN npm run build

 # Elixir release
 RUN source /root/.bashrc && \
--- a/docker/production/Dockerfile
+++ b/docker/production/Dockerfile
@ -3,11 +3,10 @@ FROM node:18-alpine as assets

 RUN apk add --no-cache python3 build-base libwebp-tools bash imagemagick ncurses
 WORKDIR /build
-COPY js .
+COPY . .

 # Network timeout because it's slow when cross-compiling
-RUN yarn install --network-timeout 100000 \
-    && yarn run build
+RUN npm install && npm run build

 # Then, build the application binary
 FROM elixir:1.15-alpine AS builder
--- a/docker/tests/Dockerfile
+++ b/docker/tests/Dockerfile
@ -4,7 +4,7 @@ LABEL maintainer="Thomas Citharel <tcit@tcit.fr>"
 ENV REFRESHED_AT=2023-08-17
 RUN apt-get update -yq && apt-get install -yq build-essential inotify-tools postgresql-client git curl gnupg xvfb libgtk-3-dev libnotify-dev libgconf-2-4 libnss3 libxss1 libasound2 cmake exiftool python3-pip python3-setuptools
 RUN curl -sL https://deb.nodesource.com/setup_20.x | bash && apt-get install nodejs -yq
-RUN npm install -g yarn wait-on
+RUN npm install -g wait-on
 RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 RUN mix local.hex --force && mix local.rebar --force
 RUN pip3 install -Iv weasyprint pyexcel_ods3
--- a/docs/dev.md
+++ b/docs/dev.md
@ -19,7 +19,7 @@ Mobilizon is an app that uses:

  * `config` backend compile-time and runtime configuration
  * `docker` 🐳
-  * `js/src` Front-end
+  * `src` Front-end
  * `lib/federation` Handling all the federation stuff (sending and receving activities, converting activities, signatures, helpers…)
  * `lib/graphql/schema` The schema declarations for the GraphQL API
  * `lib/graphql/resolvers` The logic behind the GraphQL API
--- a/js/env.d.ts
+++ b/js/env.d.ts
--- a/js/fragmentTypes.json
+++ b/js/fragmentTypes.json
--- a/js/get_union_json.ts
+++ b/js/get_union_json.ts
--- a/js/histoire.config.ts
+++ b/js/histoire.config.ts
@ -8,6 +8,7 @@ export default defineConfig({
  plugins: [HstVue()],
  setupFile: path.resolve(__dirname, "./src/histoire.setup.ts"),
  viteNodeInlineDeps: [/date-fns/],
+  // viteIgnorePlugins: ['vite-plugin-pwa', 'vite-plugin-pwa:build', 'vite-plugin-pwa:info'],
  tree: {
    groups: [
      {
--- a/js/.gitignore
+++ b/js/.gitignore
@ -1,27 +0,0 @@
-.DS_Store
-node_modules
-/dist
-
-/coverage
-stats.html
-
-# local env files
-.env.local
-.env.*.local
-
-# Log files
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-
-# Editor directories and files
-.idea
-.vscode
-*.suo
-*.ntvs*
-*.njsproj
-*.sln
-*.sw?
-/test-results/
-/playwright-report/
-/playwright/.cache/
--- a/js/.prettierignore
+++ b/js/.prettierignore
@ -1,2 +0,0 @@
-src/i18n/*.json
-coverage/
--- a/js/src/composition/apollo/tags.ts
+++ b/js/src/composition/apollo/tags.ts
@ -1,20 +0,0 @@
-import { FILTER_TAGS } from "@/graphql/tags";
-import { ITag } from "@/types/tag.model";
-import { apolloClient, waitApolloQuery } from "@/vue-apollo";
-import { provideApolloClient, useQuery } from "@vue/apollo-composable";
-
-export async function fetchTags(text: string): Promise<ITag[]> {
-  try {
-    const res = await waitApolloQuery(
-      provideApolloClient(apolloClient)(() =>
-        useQuery<{ tags: ITag[] }, { filter: string }>(FILTER_TAGS, {
-          filter: text,
-        })
-      )
-    );
-    return res.data.tags;
-  } catch (e) {
-    console.error(e);
-    return [];
-  }
-}
--- a/js/src/typings/absinthe.d.ts
+++ b/js/src/typings/absinthe.d.ts
@ -1,5 +0,0 @@
-declare module "@absinthe/socket";
-
-declare module "@absinthe/socket-apollo-link";
-
-declare module "apollo-absinthe-upload-link";
--- a/js/src/vue-apollo.ts
+++ b/js/src/vue-apollo.ts
@ -1,38 +0,0 @@
-import {
-  ApolloClient,
-  ApolloQueryResult,
-  NormalizedCacheObject,
-  OperationVariables,
-} from "@apollo/client/core";
-import buildCurrentUserResolver from "@/apollo/user";
-import { cache } from "./apollo/memory";
-import { fullLink } from "./apollo/link";
-import { UseQueryReturn } from "@vue/apollo-composable";
-
-export const apolloClient = new ApolloClient<NormalizedCacheObject>({
-  cache,
-  link: fullLink,
-  connectToDevTools: true,
-  resolvers: buildCurrentUserResolver(cache),
-});
-
-export function waitApolloQuery<
-  TResult = any,
-  TVariables extends OperationVariables = OperationVariables,
->({
-  onResult,
-  onError,
-}: UseQueryReturn<TResult, TVariables>): Promise<ApolloQueryResult<TResult>> {
-  return new Promise((res, rej) => {
-    const { off: offResult } = onResult((result) => {
-      if (result.loading === false) {
-        offResult();
-        res(result);
-      }
-    });
-    const { off: offError } = onError((error) => {
-      offError();
-      rej(error);
-    });
-  });
-}
--- a/js/tests/unit/specs/components/Comment/snapshots/CommentTree.spec.ts.snap
+++ b/js/tests/unit/specs/components/Comment/snapshots/CommentTree.spec.ts.snap
@ -1,67 +0,0 @@
-// Vitest Snapshot v1
-
-exports[`CommentTree > renders a comment tree with comments 1`] = `
-"<div data-v-5d0380ab=\\"\\">
-  <form class=\\"\\" data-v-5d0380ab=\\"\\">
-    <!--v-if-->
-    <article class=\\"flex flex-wrap items-start gap-2\\" data-v-5d0380ab=\\"\\">
-      <figure class=\\"\\" data-v-5d0380ab=\\"\\">
-        <identity-picker-wrapper-stub modelvalue=\\"[object Object]\\" inline=\\"false\\" masked=\\"false\\" data-v-5d0380ab=\\"\\"></identity-picker-wrapper-stub>
-      </figure>
-      <div class=\\"flex-1\\" data-v-5d0380ab=\\"\\">
-        <div class=\\"flex flex-col gap-2\\" data-v-5d0380ab=\\"\\">
-          <div class=\\"editor-wrapper\\" data-v-5d0380ab=\\"\\">
-            <editor-stub currentactor=\\"[object Object]\\" mode=\\"comment\\" modelvalue=\\"\\" aria-label=\\"Comment body\\" data-v-5d0380ab=\\"\\"></editor-stub>
-            <!--v-if-->
-          </div>
-          <!--v-if-->
-        </div>
-      </div>
-      <div class=\\"\\" data-v-5d0380ab=\\"\\">
-        <o-button-stub variant=\\"primary\\" iconleft=\\"send\\" rounded=\\"false\\" outlined=\\"false\\" expanded=\\"false\\" inverted=\\"false\\" nativetype=\\"submit\\" tag=\\"button\\" disabled=\\"false\\" iconboth=\\"false\\" data-v-5d0380ab=\\"\\"></o-button-stub>
-      </div>
-    </article>
-  </form>
-  <transition-group-stub data-v-5d0380ab=\\"\\">
-    <transition-group-stub data-v-5d0380ab=\\"\\">
-      <comment-stub comment=\\"[object Object]\\" event=\\"[object Object]\\" currentactor=\\"[object Object]\\" rootcomment=\\"true\\" class=\\"root-comment\\" data-v-5d0380ab=\\"\\"></comment-stub>
-      <comment-stub comment=\\"[object Object]\\" event=\\"[object Object]\\" currentactor=\\"[object Object]\\" rootcomment=\\"true\\" class=\\"root-comment\\" data-v-5d0380ab=\\"\\"></comment-stub>
-    </transition-group-stub>
-  </transition-group-stub>
-</div>"
-`;
-
-exports[`CommentTree > renders a loading comment tree 1`] = `
-"<div data-v-5d0380ab=\\"\\">
-  <!--v-if-->
-  <p class=\\"text-center\\" data-v-5d0380ab=\\"\\">Loading comments…</p>
-</div>"
-`;
-
-exports[`CommentTree > renders an empty comment tree 1`] = `
-"<div data-v-5d0380ab=\\"\\">
-  <form class=\\"\\" data-v-5d0380ab=\\"\\">
-    <!--v-if-->
-    <article class=\\"flex flex-wrap items-start gap-2\\" data-v-5d0380ab=\\"\\">
-      <figure class=\\"\\" data-v-5d0380ab=\\"\\">
-        <identity-picker-wrapper-stub modelvalue=\\"[object Object]\\" inline=\\"false\\" masked=\\"false\\" data-v-5d0380ab=\\"\\"></identity-picker-wrapper-stub>
-      </figure>
-      <div class=\\"flex-1\\" data-v-5d0380ab=\\"\\">
-        <div class=\\"flex flex-col gap-2\\" data-v-5d0380ab=\\"\\">
-          <div class=\\"editor-wrapper\\" data-v-5d0380ab=\\"\\">
-            <editor-stub currentactor=\\"[object Object]\\" mode=\\"comment\\" modelvalue=\\"\\" aria-label=\\"Comment body\\" data-v-5d0380ab=\\"\\"></editor-stub>
-            <!--v-if-->
-          </div>
-          <!--v-if-->
-        </div>
-      </div>
-      <div class=\\"\\" data-v-5d0380ab=\\"\\">
-        <o-button-stub variant=\\"primary\\" iconleft=\\"send\\" rounded=\\"false\\" outlined=\\"false\\" expanded=\\"false\\" inverted=\\"false\\" nativetype=\\"submit\\" tag=\\"button\\" disabled=\\"false\\" iconboth=\\"false\\" data-v-5d0380ab=\\"\\"></o-button-stub>
-      </div>
-    </article>
-  </form>
-  <transition-group-stub data-v-5d0380ab=\\"\\">
-    <empty-content-stub icon=\\"comment\\" descriptionclasses=\\"\\" inline=\\"true\\" center=\\"false\\" data-v-5d0380ab=\\"\\"></empty-content-stub>
-  </transition-group-stub>
-</div>"
-`;
--- a/js/tests/unit/specs/components/Post/snapshots/PostListItem.spec.ts.snap
+++ b/js/tests/unit/specs/components/Post/snapshots/PostListItem.spec.ts.snap
@ -1,37 +0,0 @@
-// Vitest Snapshot v1
-
-exports[`PostListItem > renders post list item with basic informations 1`] = `
-"<a href=\\"/p/my-blog-post-some-uuid\\" class=\\"block md:flex bg-white dark:bg-violet-2 dark:text-white dark:hover:text-white rounded-lg shadow-md\\" dir=\\"auto\\" data-v-6ca7cc69=\\"\\">
-  <!--v-if-->
-  <div class=\\"flex flex-col gap-1 bg-inherit p-2 rounded-lg flex-1\\" data-v-6ca7cc69=\\"\\">
-    <h3 class=\\"text-xl color-violet-3 line-clamp-3 mb-2 font-bold\\" lang=\\"en\\" data-v-6ca7cc69=\\"\\">My Blog Post</h3>
-    <p class=\\"flex gap-2\\" data-v-6ca7cc69=\\"\\"><span aria-hidden=\\"true\\" class=\\"material-design-icon clock-icon\\" role=\\"img\\" data-v-6ca7cc69=\\"\\"><svg fill=\\"currentColor\\" class=\\"material-design-icon__svg\\" width=\\"24\\" height=\\"24\\" viewBox=\\"0 0 24 24\\"><path d=\\"M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10,10 0 0,0 12,2M16.2,16.2L11,13V7H12.5V12.2L17,14.9L16.2,16.2Z\\"><!--v-if--></path></svg></span><span dir=\\"auto\\" class=\\"\\" data-v-6ca7cc69=\\"\\">Dec 2, 2020</span></p>
-    <!--v-if-->
-    <!--v-if-->
-  </div>
-</a>"
-`;
-
-exports[`PostListItem > renders post list item with publisher name 1`] = `
-"<a href=\\"/p/my-blog-post-some-uuid\\" class=\\"block md:flex bg-white dark:bg-violet-2 dark:text-white dark:hover:text-white rounded-lg shadow-md\\" dir=\\"auto\\" data-v-6ca7cc69=\\"\\">
-  <!--v-if-->
-  <div class=\\"flex flex-col gap-1 bg-inherit p-2 rounded-lg flex-1\\" data-v-6ca7cc69=\\"\\">
-    <h3 class=\\"text-xl color-violet-3 line-clamp-3 mb-2 font-bold\\" lang=\\"en\\" data-v-6ca7cc69=\\"\\">My Blog Post</h3>
-    <p class=\\"flex gap-2\\" data-v-6ca7cc69=\\"\\"><span aria-hidden=\\"true\\" class=\\"material-design-icon clock-icon\\" role=\\"img\\" data-v-6ca7cc69=\\"\\"><svg fill=\\"currentColor\\" class=\\"material-design-icon__svg\\" width=\\"24\\" height=\\"24\\" viewBox=\\"0 0 24 24\\"><path d=\\"M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10,10 0 0,0 12,2M16.2,16.2L11,13V7H12.5V12.2L17,14.9L16.2,16.2Z\\"><!--v-if--></path></svg></span><span dir=\\"auto\\" class=\\"\\" data-v-6ca7cc69=\\"\\">Dec 2, 2020</span></p>
-    <!--v-if-->
-    <p class=\\"flex gap-1\\" data-v-6ca7cc69=\\"\\"><span aria-hidden=\\"true\\" class=\\"material-design-icon account-edit-icon\\" role=\\"img\\" data-v-6ca7cc69=\\"\\"><svg fill=\\"currentColor\\" class=\\"material-design-icon__svg\\" width=\\"24\\" height=\\"24\\" viewBox=\\"0 0 24 24\\"><path d=\\"M21.7,13.35L20.7,14.35L18.65,12.3L19.65,11.3C19.86,11.09 20.21,11.09 20.42,11.3L21.7,12.58C21.91,12.79 21.91,13.14 21.7,13.35M12,18.94L18.06,12.88L20.11,14.93L14.06,21H12V18.94M12,14C7.58,14 4,15.79 4,18V20H10V18.11L14,14.11C13.34,14.03 12.67,14 12,14M12,4A4,4 0 0,0 8,8A4,4 0 0,0 12,12A4,4 0 0,0 16,8A4,4 0 0,0 12,4Z\\"><!--v-if--></path></svg></span>Published by <b class=\\"\\" data-v-6ca7cc69=\\"\\">An author</b></p>
-  </div>
-</a>"
-`;
-
-exports[`PostListItem > renders post list item with tags 1`] = `
-"<a href=\\"/p/my-blog-post-some-uuid\\" class=\\"block md:flex bg-white dark:bg-violet-2 dark:text-white dark:hover:text-white rounded-lg shadow-md\\" dir=\\"auto\\" data-v-6ca7cc69=\\"\\">
-  <!--v-if-->
-  <div class=\\"flex flex-col gap-1 bg-inherit p-2 rounded-lg flex-1\\" data-v-6ca7cc69=\\"\\">
-    <h3 class=\\"text-xl color-violet-3 line-clamp-3 mb-2 font-bold\\" lang=\\"en\\" data-v-6ca7cc69=\\"\\">My Blog Post</h3>
-    <p class=\\"flex gap-2\\" data-v-6ca7cc69=\\"\\"><span aria-hidden=\\"true\\" class=\\"material-design-icon clock-icon\\" role=\\"img\\" data-v-6ca7cc69=\\"\\"><svg fill=\\"currentColor\\" class=\\"material-design-icon__svg\\" width=\\"24\\" height=\\"24\\" viewBox=\\"0 0 24 24\\"><path d=\\"M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10,10 0 0,0 12,2M16.2,16.2L11,13V7H12.5V12.2L17,14.9L16.2,16.2Z\\"><!--v-if--></path></svg></span><span dir=\\"auto\\" class=\\"\\" data-v-6ca7cc69=\\"\\">Dec 2, 2020</span></p>
-    <div class=\\"flex flex-wrap gap-y-0 gap-x-2\\" data-v-6ca7cc69=\\"\\"><span aria-hidden=\\"true\\" class=\\"material-design-icon tag-icon\\" role=\\"img\\" data-v-6ca7cc69=\\"\\"><svg fill=\\"currentColor\\" class=\\"material-design-icon__svg\\" width=\\"24\\" height=\\"24\\" viewBox=\\"0 0 24 24\\"><path d=\\"M5.5,7A1.5,1.5 0 0,1 4,5.5A1.5,1.5 0 0,1 5.5,4A1.5,1.5 0 0,1 7,5.5A1.5,1.5 0 0,1 5.5,7M21.41,11.58L12.41,2.58C12.05,2.22 11.55,2 11,2H4C2.89,2 2,2.89 2,4V11C2,11.55 2.22,12.05 2.59,12.41L11.58,21.41C11.95,21.77 12.45,22 13,22C13.55,22 14.05,21.77 14.41,21.41L21.41,14.41C21.78,14.05 22,13.55 22,13C22,12.44 21.77,11.94 21.41,11.58Z\\"><!--v-if--></path></svg></span><span class=\\"rounded-md truncate text-sm text-violet-title px-2 py-1 bg-purple-3 dark:text-violet-3\\" data-v-6955ca87=\\"\\" data-v-6ca7cc69=\\"\\">A tag</span></div>
-    <!--v-if-->
-  </div>
-</a>"
-`;
--- a/js/tests/unit/specs/components/Report/snapshots/ReportModal.spec.ts.snap
+++ b/js/tests/unit/specs/components/Report/snapshots/ReportModal.spec.ts.snap
@ -1,29 +0,0 @@
-// Vitest Snapshot v1
-
-exports[`ReportModal > renders report modal with basic informations and submits it 1`] = `
-"<div class=\\"p-2\\" data-v-e0cceef3=\\"\\">
-  <!--v-if-->
-  <section data-v-e0cceef3=\\"\\">
-    <div class=\\"flex gap-1 flex-row mb-3\\" data-v-e0cceef3=\\"\\"><span class=\\"o-icon o-icon--warning hidden md:block flex-1\\" data-v-e0cceef3=\\"\\"><i class=\\"mdi mdi-alert 48\\"></i></span>
-      <p data-v-e0cceef3=\\"\\">The report will be sent to the moderators of your instance. You can explain why you report this content below.</p>
-    </div>
-    <div class=\\"\\" data-v-e0cceef3=\\"\\">
-      <!--v-if-->
-      <div class=\\"o-field o-field--filled\\" data-v-e0cceef3=\\"\\"><label for=\\"additional-comments\\" class=\\"o-field__label\\">Additional comments</label>
-        <div class=\\"o-ctrl-input\\" data-v-e0cceef3=\\"\\"><textarea id=\\"additional-comments\\" class=\\"o-input o-input__textarea\\"></textarea>
-          <!--v-if-->
-          <!--v-if-->
-          <!--v-if-->
-        </div>
-        <!--v-if-->
-      </div>
-      <!--v-if-->
-    </div>
-  </section>
-  <footer class=\\"flex gap-2 py-3\\" data-v-e0cceef3=\\"\\"><button type=\\"button\\" class=\\"o-btn o-btn--outlined\\" data-v-e0cceef3=\\"\\"><span class=\\"o-btn__wrapper\\"><!--v-if--><span class=\\"o-btn__label\\">Cancel</span>
-      <!--v-if--></span>
-    </button><button type=\\"button\\" class=\\"o-btn o-btn--primary\\" data-v-e0cceef3=\\"\\"><span class=\\"o-btn__wrapper\\"><!--v-if--><span class=\\"o-btn__label\\">Send the report</span>
-      <!--v-if--></span>
-    </button></footer>
-</div>"
-`;
--- a/js/tests/unit/specs/components/snapshots/navbar.spec.ts.snap
+++ b/js/tests/unit/specs/components/snapshots/navbar.spec.ts.snap
@ -1,196 +0,0 @@
-// Vitest Snapshot v1
-
-exports[`App component > renders a Vue component 1`] = `
-"<nav class=\\"bg-white border-gray-200 px-2 sm:px-4 py-2.5 dark:bg-zinc-900\\" id=\\"navbar\\">
-  <div class=\\"container mx-auto flex flex-wrap items-center mx-auto gap-4\\">
-    <router-link to=\\"[object Object]\\" class=\\"flex items-center\\">
-      <mobilizon-logo-stub invert=\\"false\\" class=\\"w-40\\"></mobilizon-logo-stub>
-    </router-link>
-    <!--v-if--><button type=\\"button\\" class=\\"inline-flex items-center p-2 ml-1 text-sm text-zinc-500 rounded-lg md:hidden hover:bg-zinc-100 focus:outline-none focus:ring-2 focus:ring-gray-200 dark:text-zinc-400 dark:hover:bg-zinc-700 dark:focus:ring-gray-600\\" aria-controls=\\"mobile-menu-2\\" aria-expanded=\\"false\\"><span class=\\"sr-only\\">Open main menu</span><svg class=\\"w-6 h-6\\" aria-hidden=\\"true\\" fill=\\"currentColor\\" viewBox=\\"0 0 20 20\\" xmlns=\\"http://www.w3.org/2000/svg\\">
-        <path fill-rule=\\"evenodd\\" d=\\"M3 5a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM3 10a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM3 15a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1z\\" clip-rule=\\"evenodd\\"></path>
-      </svg></button>
-    <div class=\\"justify-between items-center w-full md:flex md:w-auto md:order-1 hidden\\" id=\\"mobile-menu-2\\">
-      <ul class=\\"flex flex-col md:flex-row md:space-x-8 mt-2 md:mt-0 md:font-lightbold\\">
-        <!--v-if-->
-        <!--v-if-->
-        <li>
-          <router-link to=\\"[object Object]\\" class=\\"block py-2 pr-4 pl-3 text-zinc-700 border-b border-gray-100 hover:bg-zinc-50 md:hover:bg-transparent md:border-0 md:hover:text-mbz-purple-700 md:p-0 dark:text-zinc-400 md:dark:hover:text-white dark:hover:bg-zinc-700 dark:hover:text-white md:dark:hover:bg-transparent dark:border-gray-700\\">Login</router-link>
-        </li>
-        <li>
-          <router-link to=\\"[object Object]\\" class=\\"block py-2 pr-4 pl-3 text-zinc-700 border-b border-gray-100 hover:bg-zinc-50 md:hover:bg-transparent md:border-0 md:hover:text-mbz-purple-700 md:p-0 dark:text-zinc-400 md:dark:hover:text-white dark:hover:bg-zinc-700 dark:hover:text-white md:dark:hover:bg-transparent dark:border-gray-700\\">Register</router-link>
-        </li>
-      </ul>
-    </div>
-  </div>
-</nav>
-<!-- <o-navbar
-    id=\\"navbar\\"
-    type=\\"is-secondary\\"
-    wrapper-class=\\"container mx-auto\\"
-    v-model:active=\\"mobileNavbarActive\\"
-  >
-    <template #brand>
-      <o-navbar-item
-        tag=\\"router-link\\"
-        :to=\\"{ name: RouteName.HOME }\\"
-        :aria-label=\\"$t('Home')\\"
-      >
-        <logo />
-      </o-navbar-item>
-    </template>
-    <template #start>
-      <o-navbar-item tag=\\"router-link\\" :to=\\"{ name: RouteName.SEARCH }\\">{{
-        $t(\\"Explore\\")
-      }}</o-navbar-item>
-      <o-navbar-item
-        v-if=\\"currentActor.id && currentUser?.isLoggedIn\\"
-        tag=\\"router-link\\"
-        :to=\\"{ name: RouteName.MY_EVENTS }\\"
-        >{{ $t(\\"My events\\") }}</o-navbar-item
-      >
-      <o-navbar-item
-        tag=\\"router-link\\"
-        :to=\\"{ name: RouteName.MY_GROUPS }\\"
-        v-if=\\"
-          config &&
-          config.features.groups &&
-          currentActor.id &&
-          currentUser?.isLoggedIn
-        \\"
-        >{{ $t(\\"My groups\\") }}</o-navbar-item
-      >
-      <o-navbar-item
-        tag=\\"span\\"
-        v-if=\\"
-          config &&
-          config.features.eventCreation &&
-          currentActor.id &&
-          currentUser?.isLoggedIn
-        \\"
-      >
-        <o-button
-          v-if=\\"!hideCreateEventsButton\\"
-          tag=\\"router-link\\"
-          :to=\\"{ name: RouteName.CREATE_EVENT }\\"
-          variant=\\"primary\\"
-          >{{ $t(\\"Create\\") }}</o-button
-        >
-      </o-navbar-item>
-    </template>
-    <template #end>
-      <o-navbar-item tag=\\"div\\">
-        <search-field @navbar-search=\\"mobileNavbarActive = false\\" />
-      </o-navbar-item>
-
-      <o-navbar-dropdown
-        v-if=\\"currentActor.id && currentUser?.isLoggedIn\\"
-        right
-        collapsible
-        ref=\\"user-dropdown\\"
-        tabindex=\\"0\\"
-        tag=\\"span\\"
-        @keyup.enter=\\"toggleMenu\\"
-      >
-        <template #label v-if=\\"currentActor\\">
-          <div class=\\"identity-wrapper\\">
-            <div>
-              <figure class=\\"image is-32x32\\" v-if=\\"currentActor.avatar\\">
-                <img
-                  class=\\"is-rounded\\"
-                  alt=\\"avatarUrl\\"
-                  :src=\\"currentActor.avatar.url\\"
-                />
-              </figure>
-              <o-icon v-else icon=\\"account-circle\\" />
-            </div>
-            <div class=\\"media-content is-hidden-desktop\\">
-              <span>{{ displayName(currentActor) }}</span>
-              <span class=\\"has-text-grey-dark\\" v-if=\\"currentActor.name\\"
-                >@{{ currentActor.preferredUsername }}</span
-              >
-            </div>
-          </div>
-        </template>
-
-        No identities dropdown if no identities
-        <span v-if=\\"identities.length <= 1\\"></span>
-        <o-navbar-item
-          tag=\\"span\\"
-          v-for=\\"identity in identities\\"
-          v-else
-          :active=\\"identity.id === currentActor.id\\"
-          :key=\\"identity.id\\"
-          tabindex=\\"0\\"
-          @click=\\"setIdentity({
-      preferredUsername: identity.preferredUsername,
-    })\\"
-          @keyup.enter=\\"setIdentity({
-      preferredUsername: identity.preferredUsername,
-    })\\"
-        >
-          <span>
-            <div class=\\"media-left\\">
-              <figure class=\\"image is-32x32\\" v-if=\\"identity.avatar\\">
-                <img
-                  class=\\"is-rounded\\"
-                  loading=\\"lazy\\"
-                  :src=\\"identity.avatar.url\\"
-                  alt
-                />
-              </figure>
-              <o-icon v-else size=\\"is-medium\\" icon=\\"account-circle\\" />
-            </div>
-
-            <div class=\\"media-content\\">
-              <span>{{ displayName(identity) }}</span>
-              <span class=\\"has-text-grey-dark\\" v-if=\\"identity.name\\"
-                >@{{ identity.preferredUsername }}</span
-              >
-            </div>
-          </span>
-
-          <hr class=\\"navbar-divider\\" role=\\"presentation\\" />
-        </o-navbar-item>
-
-        <o-navbar-item
-          tag=\\"router-link\\"
-          :to=\\"{ name: RouteName.UPDATE_IDENTITY }\\"
-          >{{ $t(\\"My account\\") }}</o-navbar-item
-        >
-        <o-navbar-item
-          v-if=\\"currentUser.role === ICurrentUserRole.ADMINISTRATOR\\"
-          tag=\\"router-link\\"
-          :to=\\"{ name: RouteName.ADMIN_DASHBOARD }\\"
-          >{{ $t(\\"Administration\\") }}</o-navbar-item
-        >
-
-        <o-navbar-item
-          tag=\\"span\\"
-          tabindex=\\"0\\"
-          @click=\\"logout\\"
-          @keyup.enter=\\"logout\\"
-        >
-          <span>{{ $t(\\"Log out\\") }}</span>
-        </o-navbar-item>
-      </o-navbar-dropdown>
-
-      <o-navbar-item v-else tag=\\"div\\">
-        <div class=\\"buttons\\">
-          <router-link
-            class=\\"button is-primary\\"
-            v-if=\\"config && config.registrationsOpen\\"
-            :to=\\"{ name: RouteName.REGISTER }\\"
-          >
-            <strong>{{ $t(\\"Sign up\\") }}</strong>
-          </router-link>
-
-          <router-link
-            class=\\"button is-light\\"
-            :to=\\"{ name: RouteName.LOGIN }\\"
-            >{{ $t(\\"Log in\\") }}</router-link
-          >
-        </div>
-      </o-navbar-item>
-    </template>
-  </o-navbar> -->"
-`;
--- a/js/tsconfig.json
+++ b/js/tsconfig.json
@ -1,40 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "esnext",
-    "module": "esnext",
-    "strict": true,
-    "jsx": "preserve",
-    "importHelpers": true,
-    "moduleResolution": "node",
-    "experimentalDecorators": true,
-    "skipLibCheck": true,
-    "esModuleInterop": true,
-    "allowSyntheticDefaultImports": true,
-    "resolveJsonModule": true,
-    "isolatedModules": true,
-    "sourceMap": true,
-    "baseUrl": ".",
-    "types": ["webpack-env", "jest", "vite/client", "vite-plugin-pwa/vue"],
-    "typeRoots": ["./@types", "./node_modules/@types"],
-    "paths": {
-      "@/*": ["src/*"]
-    },
-    "lib": [
-      "esnext",
-      "dom",
-      "es2017.intl",
-      "dom.iterable",
-      "scripthost",
-      "webworker"
-    ]
-  },
-  "include": [
-    "src/**/*.ts",
-    "src/**/*.tsx",
-    "src/**/*.vue",
-    "tests/**/*.ts",
-    "tests/**/*.tsx",
-    "env.d.ts"
-  ],
-  "exclude": ["node_modules"]
-}
--- a/js/yarn.lock
+++ b/js/yarn.lock
--- a/lib/federation/activity_pub/actions/create.ex
+++ b/lib/federation/activity_pub/actions/create.ex
@ -14,7 +14,15 @@ defmodule Mobilizon.Federation.ActivityPub.Actions.Create do
    ]

  @type create_entities ::
-          :event | :comment | :discussion | :actor | :todo_list | :todo | :resource | :post
+          :event
+          | :comment
+          | :discussion
+          | :conversation
+          | :actor
+          | :todo_list
+          | :todo
+          | :resource
+          | :post

  @doc """
  Create an activity of type `Create`
@ -50,18 +58,27 @@ defmodule Mobilizon.Federation.ActivityPub.Actions.Create do
    end
  end

+  @map_types %{
+    :event => Types.Events,
+    :comment => Types.Comments,
+    :discussion => Types.Discussions,
+    :conversation => Types.Conversations,
+    :actor => Types.Actors,
+    :todo_list => Types.TodoLists,
+    :todo => Types.Todos,
+    :resource => Types.Resources,
+    :post => Types.Posts
+  }
+
  @spec do_create(create_entities(), map(), map()) ::
          {:ok, Entity.t(), Activity.t()} | {:error, Ecto.Changeset.t() | atom()}
  defp do_create(type, args, additional) do
-    case type do
-      :event -> Types.Events.create(args, additional)
-      :comment -> Types.Comments.create(args, additional)
-      :discussion -> Types.Discussions.create(args, additional)
-      :actor -> Types.Actors.create(args, additional)
-      :todo_list -> Types.TodoLists.create(args, additional)
-      :todo -> Types.Todos.create(args, additional)
-      :resource -> Types.Resources.create(args, additional)
-      :post -> Types.Posts.create(args, additional)
+    mod = Map.get(@map_types, type)
+
+    if is_nil(mod) do
+      {:error, :type_not_supported}
+    else
+      mod.create(args, additional)
    end
  end

--- a/lib/federation/activity_pub/audience.ex
+++ b/lib/federation/activity_pub/audience.ex
@ -5,6 +5,7 @@ defmodule Mobilizon.Federation.ActivityPub.Audience do

  alias Mobilizon.{Actors, Discussions, Events, Share}
  alias Mobilizon.Actors.{Actor, Member}
+  alias Mobilizon.Conversations.Conversation
  alias Mobilizon.Discussions.{Comment, Discussion}
  alias Mobilizon.Events.{Event, Participant}
  alias Mobilizon.Federation.ActivityPub.Types.Entity
@ -38,6 +39,10 @@ defmodule Mobilizon.Federation.ActivityPub.Audience do
    %{"to" => maybe_add_group_members([], actor), "cc" => []}
  end

+  def get_audience(%Conversation{participants: participants}) do
+    %{"to" => Enum.map(participants, & &1.url), "cc" => []}
+  end
+
  # Deleted comments are just like tombstones
  def get_audience(%Comment{deleted_at: deleted_at}) when not is_nil(deleted_at) do
    %{"to" => [@ap_public], "cc" => []}
--- a/lib/federation/activity_pub/fetcher.ex
+++ b/lib/federation/activity_pub/fetcher.ex
@ -177,7 +177,7 @@ defmodule Mobilizon.Federation.ActivityPub.Fetcher do
        {:error, :content_not_json}

      {:ok, %Tesla.Env{} = res} ->
-        Logger.debug("Resource returned bad HTTP code #{inspect(res)}")
+        Logger.debug("Resource returned bad HTTP code (#{res.status}) #{inspect(res)}")
        {:error, :http_error}

      {:error, err} ->
--- a/lib/federation/activity_pub/transmogrifier.ex
+++ b/lib/federation/activity_pub/transmogrifier.ex
@ -68,24 +68,26 @@ defmodule Mobilizon.Federation.ActivityPub.Transmogrifier do
  def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object}) do
    Logger.info("Handle incoming to create notes")

-    case Converter.Comment.as_to_model_data(object) do
-      %{visibility: visibility, event_id: event_id}
-      when visibility != :public and event_id != nil ->
-        Logger.info("Tried to reply to an event with a private comment - ignore")
-        :error
+    case Discussions.get_comment_from_url_with_preload(object["id"]) do
+      {:error, :comment_not_found} ->
+        case Converter.Comment.as_to_model_data(object) do
+          %{visibility: visibility, attributed_to_id: attributed_to_id} = object_data
+          when visibility === :private and is_nil(attributed_to_id) ->
+            Actions.Create.create(:conversation, object_data, false)

-      object_data when is_map(object_data) ->
-        case Discussions.get_comment_from_url_with_preload(object_data.url) do
-          {:error, :comment_not_found} ->
-            object_data
-            |> transform_object_data_for_discussion()
-            |> save_comment_or_discussion()
-
-          {:ok, %Comment{} = comment} ->
-            # Object already exists
-            {:ok, nil, comment}
+          object_data when is_map(object_data) ->
+            case Discussions.get_comment_from_url_with_preload(object_data.url) do
+              {:error, :comment_not_found} ->
+                object_data
+                |> transform_object_data_for_discussion()
+                |> save_comment_or_discussion()
+            end
        end

+      {:ok, %Comment{} = comment} ->
+        # Object already exists
+        {:ok, nil, comment}
+
      {:error, err} ->
        {:error, err}
    end
--- a/lib/federation/activity_pub/types/conversation.ex
+++ b/lib/federation/activity_pub/types/conversation.ex
@ -0,0 +1,219 @@
+defmodule Mobilizon.Federation.ActivityPub.Types.Conversations do
+  @moduledoc false
+
+  # alias Mobilizon.Conversations.ConversationParticipant
+  alias Mobilizon.{Actors, Conversations, Discussions}
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.Conversation
+  alias Mobilizon.Discussions.Comment
+  alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
+  alias Mobilizon.Federation.ActivityPub.{Audience, Permission}
+  alias Mobilizon.Federation.ActivityPub.Types.Entity
+  alias Mobilizon.Federation.ActivityStream
+  alias Mobilizon.Federation.ActivityStream.Converter.Utils, as: ConverterUtils
+  alias Mobilizon.Federation.ActivityStream.Convertible
+  alias Mobilizon.GraphQL.API.Utils, as: APIUtils
+  alias Mobilizon.Service.Activity.Conversation, as: ConversationActivity
+  alias Mobilizon.Web.Endpoint
+  import Mobilizon.Federation.ActivityPub.Utils, only: [make_create_data: 2, make_update_data: 2]
+  require Logger
+
+  @behaviour Entity
+
+  @impl Entity
+  @spec create(map(), map()) ::
+          {:ok, Conversation.t(), ActivityStream.t()}
+          | {:error,
+             :conversation_not_found
+             | :last_comment_not_found
+             | :empty_participants
+             | Ecto.Changeset.t()}
+  def create(%{conversation_id: conversation_id} = args, additional)
+      when not is_nil(conversation_id) do
+    Logger.debug("Creating a reply to a conversation #{inspect(args, pretty: true)}")
+    args = prepare_args(args)
+    Logger.debug("Creating a reply to a conversation #{inspect(args, pretty: true)}")
+
+    with args when is_map(args) <- prepare_args(args) do
+      case Conversations.get_conversation(conversation_id) do
+        %Conversation{} = conversation ->
+          case Conversations.reply_to_conversation(conversation, args) do
+            {:ok, %Conversation{last_comment_id: last_comment_id} = conversation} ->
+              ConversationActivity.insert_activity(conversation, subject: "conversation_replied")
+              maybe_publish_graphql_subscription(conversation)
+
+              case Discussions.get_comment_with_preload(last_comment_id) do
+                %Comment{} = last_comment ->
+                  comment_as_data = Convertible.model_to_as(last_comment)
+                  audience = Audience.get_audience(conversation)
+                  create_data = make_create_data(comment_as_data, Map.merge(audience, additional))
+                  {:ok, conversation, create_data}
+
+                nil ->
+                  {:error, :last_comment_not_found}
+              end
+
+            {:error, _, %Ecto.Changeset{} = err, _} ->
+              {:error, err}
+          end
+
+        nil ->
+          {:error, :discussion_not_found}
+      end
+    end
+  end
+
+  @impl Entity
+  def create(args, additional) do
+    with args when is_map(args) <- prepare_args(args) do
+      case Conversations.create_conversation(args) do
+        {:ok, %Conversation{} = conversation} ->
+          ConversationActivity.insert_activity(conversation, subject: "conversation_created")
+          conversation_as_data = Convertible.model_to_as(conversation)
+          audience = Audience.get_audience(conversation)
+          create_data = make_create_data(conversation_as_data, Map.merge(audience, additional))
+          {:ok, conversation, create_data}
+
+        {:error, _, %Ecto.Changeset{} = err, _} ->
+          {:error, err}
+      end
+    end
+  end
+
+  @impl Entity
+  @spec update(Conversation.t(), map(), map()) ::
+          {:ok, Conversation.t(), ActivityStream.t()} | {:error, Ecto.Changeset.t()}
+  def update(%Conversation{} = old_conversation, args, additional) do
+    case Conversations.update_conversation(old_conversation, args) do
+      {:ok, %Conversation{} = new_conversation} ->
+        # ConversationActivity.insert_activity(new_conversation,
+        #   subject: "conversation_renamed",
+        #   old_conversation: old_conversation
+        # )
+
+        conversation_as_data = Convertible.model_to_as(new_conversation)
+        audience = Audience.get_audience(new_conversation)
+        update_data = make_update_data(conversation_as_data, Map.merge(audience, additional))
+        {:ok, new_conversation, update_data}
+
+      {:error, %Ecto.Changeset{} = err} ->
+        {:error, err}
+    end
+  end
+
+  @impl Entity
+  @spec delete(Conversation.t(), Actor.t(), boolean, map()) ::
+          {:error, Ecto.Changeset.t()} | {:ok, ActivityStream.t(), Actor.t(), Conversation.t()}
+  def delete(
+        %Conversation{} = _conversation,
+        %Actor{} = _actor,
+        _local,
+        _additionnal
+      ) do
+    {:error, :not_applicable}
+  end
+
+  # @spec actor(Conversation.t()) :: Actor.t() | nil
+  # def actor(%ConversationParticipant{actor_id: actor_id}), do: Actors.get_actor(actor_id)
+
+  # @spec group_actor(Conversation.t()) :: Actor.t() | nil
+  # def group_actor(%Conversation{actor_id: actor_id}), do: Actors.get_actor(actor_id)
+
+  @spec permissions(Conversation.t()) :: Permission.t()
+  def permissions(%Conversation{}) do
+    %Permission{access: :member, create: :member, update: :moderator, delete: :moderator}
+  end
+
+  @spec maybe_publish_graphql_subscription(Conversation.t()) :: :ok
+  defp maybe_publish_graphql_subscription(%Conversation{} = conversation) do
+    Absinthe.Subscription.publish(Endpoint, conversation,
+      conversation_comment_changed: conversation.id
+    )
+
+    :ok
+  end
+
+  @spec prepare_args(map) :: map | {:error, :empty_participants}
+  defp prepare_args(args) do
+    {text, mentions, _tags} =
+      APIUtils.make_content_html(
+        args |> Map.get(:text, "") |> String.trim(),
+        # Can't put additional tags on a comment
+        [],
+        "text/html"
+      )
+
+    mentions =
+      (args |> Map.get(:mentions, []) |> prepare_mentions()) ++
+        ConverterUtils.fetch_mentions(mentions)
+
+    # Can't create a conversation with just ourselves
+    mentions =
+      Enum.filter(mentions, fn %{actor_id: actor_id} ->
+        to_string(actor_id) != to_string(args.actor_id)
+      end)
+
+    if Enum.empty?(mentions) do
+      {:error, :empty_participants}
+    else
+      event = Map.get(args, :event, get_event(Map.get(args, :event_id)))
+
+      participants =
+        (mentions ++
+           [
+             %{actor_id: args.actor_id},
+             %{
+               actor_id:
+                 if(is_nil(event),
+                   do: nil,
+                   else: event.attributed_to_id || event.organizer_actor_id
+                 )
+             }
+           ])
+        |> Enum.reduce(
+          [],
+          fn %{actor_id: actor_id}, acc ->
+            case Actors.get_actor(actor_id) do
+              nil -> acc
+              actor -> acc ++ [actor]
+            end
+          end
+        )
+        |> Enum.uniq_by(& &1.id)
+
+      args
+      |> Map.put(:text, text)
+      |> Map.put(:mentions, mentions)
+      |> Map.put(:participants, participants)
+    end
+  end
+
+  @spec prepare_mentions(list(String.t())) :: list(%{actor_id: String.t()})
+  defp prepare_mentions(mentions) do
+    Enum.reduce(mentions, [], &prepare_mention/2)
+  end
+
+  @spec prepare_mention(String.t() | map(), list()) :: list(%{actor_id: String.t()})
+  defp prepare_mention(%{actor_id: _} = mention, mentions) do
+    mentions ++ [mention]
+  end
+
+  defp prepare_mention(mention, mentions) do
+    case ActivityPubActor.find_or_make_actor_from_nickname(mention) do
+      {:ok, %Actor{id: actor_id}} ->
+        mentions ++ [%{actor_id: actor_id}]
+
+      {:error, _} ->
+        mentions
+    end
+  end
+
+  defp get_event(nil), do: nil
+
+  defp get_event(event_id) do
+    case Mobilizon.Events.get_event(event_id) do
+      {:ok, event} -> event
+      _ -> nil
+    end
+  end
+end
--- a/lib/federation/activity_pub/utils.ex
+++ b/lib/federation/activity_pub/utils.ex
@ -22,6 +22,7 @@ defmodule Mobilizon.Federation.ActivityPub.Utils do

  @actor_types ["Group", "Person", "Application"]
  @all_actor_types @actor_types ++ ["Organization", "Service"]
+  @ap_public_audience "https://www.w3.org/ns/activitystreams#Public"

  # Wraps an object into an activity
  @spec create_activity(map(), boolean()) :: {:ok, Activity.t()}
@ -491,8 +492,7 @@ defmodule Mobilizon.Federation.ActivityPub.Utils do
      if public do
        Logger.debug("Making announce data for a public object")

-        {[actor.followers_url, object_actor_url],
-         ["https://www.w3.org/ns/activitystreams#Public"]}
+        {[actor.followers_url, object_actor_url], [@ap_public_audience]}
      else
        Logger.debug("Making announce data for a private object")

@ -539,7 +539,7 @@ defmodule Mobilizon.Federation.ActivityPub.Utils do
      "actor" => url,
      "object" => activity,
      "to" => [actor.followers_url, actor.url],
-      "cc" => ["https://www.w3.org/ns/activitystreams#Public"]
+      "cc" => [@ap_public_audience]
    }

    if activity_id, do: Map.put(data, "id", activity_id), else: data
--- a/lib/federation/activity_stream/converter/comment.ex
+++ b/lib/federation/activity_stream/converter/comment.ex
@ -47,9 +47,6 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Comment do

    case maybe_fetch_actor_and_attributed_to_id(object) do
      {:ok, %Actor{id: actor_id, domain: actor_domain}, attributed_to} ->
-        Logger.debug("Inserting full comment")
-        Logger.debug(inspect(object))
-
        data = %{
          text: object["content"],
          url: object["id"],
@ -70,14 +67,7 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Comment do
          is_announcement: Map.get(object, "isAnnouncement", false)
        }

-        Logger.debug("Converted object before fetching parents")
-        Logger.debug(inspect(data))
-
-        data = maybe_fetch_parent_object(object, data)
-
-        Logger.debug("Converted object after fetching parents")
-        Logger.debug(inspect(data))
-        data
+        maybe_fetch_parent_object(object, data)

      {:error, err} ->
        {:error, err}
@ -147,19 +137,22 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Comment do
  end

  @spec determine_to(CommentModel.t()) :: [String.t()]
-  defp determine_to(%CommentModel{} = comment) do
-    cond do
-      not is_nil(comment.attributed_to) ->
-        [comment.attributed_to.url]
+  defp determine_to(%CommentModel{visibility: :private, mentions: mentions} = _comment) do
+    Enum.map(mentions, fn mention -> mention.actor.url end)
+  end

-      comment.visibility == :public ->
-        ["https://www.w3.org/ns/activitystreams#Public"]
-
-      true ->
-        [comment.actor.followers_url]
+  defp determine_to(%CommentModel{visibility: :public} = comment) do
+    if is_nil(comment.attributed_to) do
+      ["https://www.w3.org/ns/activitystreams#Public"]
+    else
+      [comment.attributed_to.url]
    end
  end

+  defp determine_to(%CommentModel{} = comment) do
+    [comment.actor.followers_url]
+  end
+
  defp maybe_fetch_parent_object(object, data) do
    # We fetch the parent object
    Logger.debug("We're fetching the parent object")
@ -170,9 +163,12 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Comment do

      case ActivityPub.fetch_object_from_url(object["inReplyTo"]) do
        # Reply to an event (Event)
-        {:ok, %Event{id: id}} ->
+        {:ok, %Event{id: id} = event} ->
          Logger.debug("Parent object is an event")
-          data |> Map.put(:event_id, id)
+
+          data
+          |> Map.put(:event_id, id)
+          |> Map.put(:event, event)

        # Reply to a comment (Comment)
        {:ok, %CommentModel{id: id} = comment} ->
@ -182,6 +178,7 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Comment do
          |> Map.put(:in_reply_to_comment_id, id)
          |> Map.put(:origin_comment_id, comment |> CommentModel.get_thread_id())
          |> Map.put(:event_id, comment.event_id)
+          |> Map.put(:conversation_id, comment.conversation_id)

        # Reply to a discucssion (Discussion)
        {:ok,
--- a/lib/federation/activity_stream/converter/conversation.ex
+++ b/lib/federation/activity_stream/converter/conversation.ex
@ -0,0 +1,68 @@
+defmodule Mobilizon.Federation.ActivityStream.Converter.Conversation do
+  @moduledoc """
+  Comment converter.
+
+  This module allows to convert conversations from ActivityStream format to our own
+  internal one, and back.
+  """
+
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.Conversation
+  alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
+  alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
+  alias Mobilizon.Federation.ActivityStream.Converter.Conversation, as: ConversationConverter
+  alias Mobilizon.Storage.Repo
+  import Mobilizon.Service.Guards, only: [is_valid_string: 1]
+
+  require Logger
+
+  @behaviour Converter
+
+  defimpl Convertible, for: Conversation do
+    defdelegate model_to_as(comment), to: ConversationConverter
+  end
+
+  @doc """
+  Make an AS comment object from an existing `conversation` structure.
+  """
+  @impl Converter
+  @spec model_to_as(Conversation.t()) :: map
+  def model_to_as(%Conversation{} = conversation) do
+    conversation = Repo.preload(conversation, [:participants, last_comment: [:actor]])
+
+    %{
+      "type" => "Note",
+      "to" => Enum.map(conversation.participants, & &1.url),
+      "cc" => [],
+      "content" => conversation.last_comment.text,
+      "mediaType" => "text/html",
+      "actor" => conversation.last_comment.actor.url,
+      "id" => conversation.last_comment.url,
+      "publishedAt" => conversation.inserted_at
+    }
+  end
+
+  @impl Converter
+  @spec as_to_model_data(map) :: map() | {:error, atom()}
+  def as_to_model_data(%{"type" => "Note", "name" => name} = object) when is_valid_string(name) do
+    with %{actor_id: actor_id, creator_id: creator_id} <- extract_actors(object) do
+      %{actor_id: actor_id, creator_id: creator_id, title: name, url: object["id"]}
+    end
+  end
+
+  @spec extract_actors(map()) ::
+          %{actor_id: String.t(), creator_id: String.t()} | {:error, atom()}
+  defp extract_actors(%{"actor" => creator_url, "attributedTo" => actor_url} = _object)
+       when is_valid_string(creator_url) and is_valid_string(actor_url) do
+    with {:ok, %Actor{id: creator_id, suspended: false}} <-
+           ActivityPubActor.get_or_fetch_actor_by_url(creator_url),
+         {:ok, %Actor{id: actor_id, suspended: false}} <-
+           ActivityPubActor.get_or_fetch_actor_by_url(actor_url) do
+      %{actor_id: actor_id, creator_id: creator_id}
+    else
+      {:error, error} -> {:error, error}
+      {:ok, %Actor{url: ^creator_url}} -> {:error, :creator_suspended}
+      {:ok, %Actor{url: ^actor_url}} -> {:error, :actor_suspended}
+    end
+  end
+end
--- a/lib/federation/web_finger/web_finger.ex
+++ b/lib/federation/web_finger/web_finger.ex
@ -242,12 +242,15 @@ defmodule Mobilizon.Federation.WebFinger do
  @spec domain_from_federated_actor(String.t()) :: {:ok, String.t()} | {:error, :host_not_found}
  defp domain_from_federated_actor(actor) do
    case String.split(actor, "@") do
+      [_name, ""] ->
+        {:error, :host_not_found}
+
      [_name, domain] ->
        {:ok, domain}

      _e ->
        host = URI.parse(actor).host
-        if is_nil(host), do: {:error, :host_not_found}, else: {:ok, host}
+        if is_nil(host) or host == "", do: {:error, :host_not_found}, else: {:ok, host}
    end
  end

--- a/lib/graphql/api/comments.ex
+++ b/lib/graphql/api/comments.ex
@ -4,7 +4,8 @@ defmodule Mobilizon.GraphQL.API.Comments do
  """

  alias Mobilizon.Actors.Actor
-  alias Mobilizon.Discussions.Comment
+  alias Mobilizon.Conversations.Conversation
+  alias Mobilizon.Discussions.{Comment, Discussion}
  alias Mobilizon.Federation.ActivityPub.{Actions, Activity}
  alias Mobilizon.GraphQL.API.Utils

@ -53,6 +54,22 @@ defmodule Mobilizon.GraphQL.API.Comments do
    )
  end

+  @doc """
+  Creates a conversation (or reply to a conversation)
+  """
+  @spec create_conversation(map()) ::
+          {:ok, Activity.t(), Conversation.t()}
+          | {:error, :entity_tombstoned | atom | Ecto.Changeset.t()}
+  def create_conversation(args) do
+    args = extract_pictures_from_comment_body(args)
+
+    Actions.Create.create(
+      :conversation,
+      args,
+      true
+    )
+  end
+
  @spec extract_pictures_from_comment_body(map()) :: map()
  defp extract_pictures_from_comment_body(%{text: text, actor_id: actor_id} = args) do
    pictures = Utils.extract_pictures_from_body(text, actor_id)
--- a/lib/graphql/api/events.ex
+++ b/lib/graphql/api/events.ex
@ -4,8 +4,8 @@ defmodule Mobilizon.GraphQL.API.Events do
  """

  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Discussions.Comment
  alias Mobilizon.Events.Event
-
  alias Mobilizon.Federation.ActivityPub.{Actions, Activity, Utils}
  alias Mobilizon.GraphQL.API.Utils, as: APIUtils

@ -36,6 +36,12 @@ defmodule Mobilizon.GraphQL.API.Events do
    Actions.Delete.delete(event, actor, true)
  end

+  @spec send_private_message_to_participants(map()) ::
+          {:ok, Activity.t(), Comment.t()} | {:error, atom() | Ecto.Changeset.t()}
+  def send_private_message_to_participants(args) do
+    Actions.Create.create(:comment, args, true)
+  end
+
  @spec prepare_args(map) :: map
  defp prepare_args(args) do
    organizer_actor = Map.get(args, :organizer_actor)
--- a/lib/graphql/api/search.ex
+++ b/lib/graphql/api/search.ex
@ -116,13 +116,9 @@ defmodule Mobilizon.GraphQL.API.Search do
  @spec process_from_username(String.t()) :: Page.t(Actor.t())
  defp process_from_username(search) do
    case ActivityPubActor.find_or_make_actor_from_nickname(search) do
-      {:ok, %Actor{type: :Group} = actor} ->
+      {:ok, %Actor{} = actor} ->
        %Page{total: 1, elements: [actor]}

-      # Don't return anything else than groups
-      {:ok, %Actor{}} ->
-        %Page{total: 0, elements: []}
-
      {:error, _err} ->
        Logger.debug(fn -> "Unable to find or make actor '#{search}'" end)

--- a/lib/graphql/authorization.ex
+++ b/lib/graphql/authorization.ex
@ -16,11 +16,13 @@ defmodule Mobilizon.GraphQL.Authorization do
  @impl true
  def has_user_access?(%User{}, _scope, _rule), do: true

+  @impl true
  def has_user_access?(%ApplicationToken{scope: scope} = _current_app_token, _struct, rule)
      when rule != :forbid_app_access do
    AppScope.has_app_access?(scope, rule)
  end

+  @impl true
  def has_user_access?(_current_user, _scoped_struct, _rule), do: false

  @impl true
--- a/lib/graphql/resolvers/conversation.ex
+++ b/lib/graphql/resolvers/conversation.ex
@ -0,0 +1,277 @@
+defmodule Mobilizon.GraphQL.Resolvers.Conversation do
+  @moduledoc """
+  Handles the group-related GraphQL calls.
+  """
+
+  alias Mobilizon.{Actors, Conversations}
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.{Conversation, ConversationParticipant, ConversationView}
+  alias Mobilizon.Events.Event
+  alias Mobilizon.GraphQL.API.Comments
+  alias Mobilizon.Storage.Page
+  alias Mobilizon.Users.User
+  alias Mobilizon.Web.Endpoint
+  import Mobilizon.Web.Gettext, only: [dgettext: 2]
+  require Logger
+
+  @spec find_conversations_for_event(Event.t(), map(), Absinthe.Resolution.t()) ::
+          {:ok, Page.t(ConversationView.t())} | {:error, :unauthenticated}
+  def find_conversations_for_event(
+        %Event{id: event_id, attributed_to_id: attributed_to_id},
+        %{page: page, limit: limit},
+        %{
+          context: %{
+            current_actor: %Actor{id: actor_id}
+          }
+        }
+      )
+      when not is_nil(attributed_to_id) do
+    if Actors.is_member?(actor_id, attributed_to_id) do
+      {:ok,
+       event_id
+       |> Conversations.find_conversations_for_event(attributed_to_id, page, limit)
+       |> conversation_participant_to_view()}
+    else
+      {:ok, %Page{total: 0, elements: []}}
+    end
+  end
+
+  @spec find_conversations_for_event(Event.t(), map(), Absinthe.Resolution.t()) ::
+          {:ok, Page.t(ConversationView.t())} | {:error, :unauthenticated}
+  def find_conversations_for_event(
+        %Event{id: event_id, organizer_actor_id: organizer_actor_id},
+        %{page: page, limit: limit},
+        %{
+          context: %{
+            current_actor: %Actor{id: actor_id}
+          }
+        }
+      ) do
+    if organizer_actor_id == actor_id do
+      {:ok,
+       event_id
+       |> Conversations.find_conversations_for_event(actor_id, page, limit)
+       |> conversation_participant_to_view()}
+    else
+      {:ok, %Page{total: 0, elements: []}}
+    end
+  end
+
+  def list_conversations(%Actor{id: actor_id}, %{page: page, limit: limit}, %{
+        context: %{
+          current_actor: %Actor{id: _current_actor_id}
+        }
+      }) do
+    {:ok,
+     actor_id
+     |> Conversations.list_conversation_participants_for_actor(page, limit)
+     |> conversation_participant_to_view()}
+  end
+
+  def list_conversations(%User{id: user_id}, %{page: page, limit: limit}, %{
+        context: %{
+          current_actor: %Actor{id: _current_actor_id}
+        }
+      }) do
+    {:ok,
+     user_id
+     |> Conversations.list_conversation_participants_for_user(page, limit)
+     |> conversation_participant_to_view()}
+  end
+
+  def unread_conversations_count(%Actor{id: actor_id}, _args, %{
+        context: %{
+          current_user: %User{} = user
+        }
+      }) do
+    case User.owns_actor(user, actor_id) do
+      {:is_owned, %Actor{}} ->
+        {:ok, Conversations.count_unread_conversation_participants_for_person(actor_id)}
+
+      _ ->
+        {:error, :unauthorized}
+    end
+  end
+
+  def get_conversation(_parent, %{id: conversation_participant_id}, %{
+        context: %{
+          current_actor: %Actor{id: performing_actor_id}
+        }
+      }) do
+    case Conversations.get_conversation_participant(conversation_participant_id) do
+      nil ->
+        {:error, :not_found}
+
+      %ConversationParticipant{actor_id: actor_id} = conversation_participant ->
+        if actor_id == performing_actor_id or Actors.is_member?(performing_actor_id, actor_id) do
+          {:ok, conversation_participant_to_view(conversation_participant)}
+        else
+          {:error, :not_found}
+        end
+    end
+  end
+
+  def get_comments_for_conversation(
+        %ConversationView{origin_comment_id: origin_comment_id, actor_id: conversation_actor_id},
+        %{page: page, limit: limit},
+        %{
+          context: %{
+            current_actor: %Actor{id: performing_actor_id}
+          }
+        }
+      ) do
+    if conversation_actor_id == performing_actor_id or
+         Actors.is_member?(performing_actor_id, conversation_actor_id) do
+      {:ok,
+       Mobilizon.Discussions.get_comments_in_reply_to_comment_id(origin_comment_id, page, limit)}
+    else
+      {:error, :unauthorized}
+    end
+  end
+
+  def create_conversation(
+        _parent,
+        %{actor_id: actor_id} = args,
+        %{
+          context: %{
+            current_actor: %Actor{} = current_actor
+          }
+        }
+      ) do
+    if authorized_to_reply?(
+         Map.get(args, :conversation_id),
+         Map.get(args, :attributed_to_id),
+         current_actor.id
+       ) do
+      case Comments.create_conversation(args) do
+        {:ok, _activity, %Conversation{} = conversation} ->
+          Absinthe.Subscription.publish(
+            Endpoint,
+            Conversations.count_unread_conversation_participants_for_person(current_actor.id),
+            person_unread_conversations_count: current_actor.id
+          )
+
+          conversation_participant_actor =
+            args |> Map.get(:attributed_to_id, actor_id) |> Actors.get_actor()
+
+          {:ok, conversation_to_view(conversation, conversation_participant_actor)}
+
+        {:error, :empty_participants} ->
+          {:error,
+           dgettext(
+             "errors",
+             "Conversation needs to mention at least one participant that's not yourself"
+           )}
+      end
+    else
+      Logger.debug(
+        "Actor #{current_actor.id} is not authorized to reply to conversation #{inspect(Map.get(args, :conversation_id))}"
+      )
+
+      {:error, :unauthorized}
+    end
+  end
+
+  def update_conversation(_parent, %{conversation_id: conversation_participant_id, read: read}, %{
+        context: %{
+          current_actor: %Actor{id: current_actor_id}
+        }
+      }) do
+    with {:no_participant,
+          %ConversationParticipant{actor_id: actor_id} = conversation_participant} <-
+           {:no_participant,
+            Conversations.get_conversation_participant(conversation_participant_id)},
+         {:valid_actor, true} <-
+           {:valid_actor,
+            actor_id == current_actor_id or
+              Actors.is_member?(current_actor_id, actor_id)},
+         {:ok, %ConversationParticipant{} = conversation_participant} <-
+           Conversations.update_conversation_participant(conversation_participant, %{
+             unread: !read
+           }) do
+      Absinthe.Subscription.publish(
+        Endpoint,
+        Conversations.count_unread_conversation_participants_for_person(actor_id),
+        person_unread_conversations_count: actor_id
+      )
+
+      {:ok, conversation_participant_to_view(conversation_participant)}
+    else
+      {:no_participant, _} ->
+        {:error, :not_found}
+
+      {:valid_actor, _} ->
+        {:error, :unauthorized}
+    end
+  end
+
+  def delete_conversation(_, _, _), do: :ok
+
+  defp conversation_participant_to_view(%Page{elements: elements} = page) do
+    %Page{page | elements: Enum.map(elements, &conversation_participant_to_view/1)}
+  end
+
+  defp conversation_participant_to_view(%ConversationParticipant{} = conversation_participant) do
+    value =
+      conversation_participant
+      |> Map.from_struct()
+      |> Map.merge(Map.from_struct(conversation_participant.conversation))
+      |> Map.delete(:conversation)
+      |> Map.put(
+        :participants,
+        Enum.map(
+          conversation_participant.conversation.participants,
+          &conversation_participant_to_actor/1
+        )
+      )
+      |> Map.put(:conversation_participant_id, conversation_participant.id)
+
+    struct(ConversationView, value)
+  end
+
+  defp conversation_to_view(
+         %Conversation{id: conversation_id} = conversation,
+         %Actor{id: actor_id} = actor,
+         unread \\ true
+       ) do
+    value =
+      conversation
+      |> Map.from_struct()
+      |> Map.put(:actor, actor)
+      |> Map.put(:unread, unread)
+      |> Map.put(
+        :conversation_participant_id,
+        Conversations.get_participant_by_conversation_and_actor(conversation_id, actor_id).id
+      )
+
+    struct(ConversationView, value)
+  end
+
+  defp conversation_participant_to_actor(%Actor{} = actor), do: actor
+
+  defp conversation_participant_to_actor(%ConversationParticipant{} = conversation_participant),
+    do: conversation_participant.actor
+
+  @spec authorized_to_reply?(String.t() | nil, String.t() | nil, String.t()) :: boolean()
+  # Not a reply
+  defp authorized_to_reply?(conversation_id, _attributed_to_id, _current_actor_id)
+       when is_nil(conversation_id),
+       do: true
+
+  # We are authorized to reply if we are one of the participants, or if we a a member of a participant group
+  defp authorized_to_reply?(conversation_id, attributed_to_id, current_actor_id) do
+    case Conversations.get_conversation(conversation_id) do
+      nil ->
+        false
+
+      %Conversation{participants: participants} ->
+        participant_ids = Enum.map(participants, fn participant -> to_string(participant.id) end)
+
+        to_string(current_actor_id) in participant_ids or
+          Enum.any?(participant_ids, fn participant_id ->
+            Actors.is_member?(current_actor_id, participant_id) and
+              attributed_to_id == participant_id
+          end)
+    end
+  end
+end
--- a/lib/graphql/resolvers/participant.ex
+++ b/lib/graphql/resolvers/participant.ex
@ -2,9 +2,11 @@ defmodule Mobilizon.GraphQL.Resolvers.Participant do
  @moduledoc """
  Handles the participation-related GraphQL calls.
  """
-  alias Mobilizon.{Actors, Config, Crypto, Events}
+  alias Mobilizon.{Actors, Config, Conversations, Crypto, Events}
  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.{Conversation, ConversationView}
  alias Mobilizon.Events.{Event, Participant}
+  alias Mobilizon.GraphQL.API.Comments
  alias Mobilizon.GraphQL.API.Participations
  alias Mobilizon.Service.Export.Participants.{CSV, ODS, PDF}
  alias Mobilizon.Users.User
@ -346,6 +348,75 @@ defmodule Mobilizon.GraphQL.Resolvers.Participant do

  def export_event_participants(_, _, _), do: {:error, :unauthorized}

+  def send_private_messages_to_participants(
+        _parent,
+        %{roles: roles, event_id: event_id, actor_id: actor_id} =
+          args,
+        %{
+          context: %{
+            current_user: %User{locale: _locale},
+            current_actor: %Actor{id: current_actor_id}
+          }
+        }
+      ) do
+    participant_actors =
+      event_id
+      |> Events.list_all_participants_for_event(roles)
+      |> Enum.map(& &1.actor)
+
+    mentions =
+      participant_actors
+      |> Enum.map(& &1.id)
+      |> Enum.uniq()
+      |> Enum.map(&%{actor_id: &1, event_id: event_id})
+
+    args =
+      Map.merge(args, %{
+        mentions: mentions,
+        visibility: :private
+      })
+
+    with {:member, true} <-
+           {:member,
+            current_actor_id == actor_id or Actors.is_member?(current_actor_id, actor_id)},
+         {:ok, _activity, %Conversation{} = conversation} <- Comments.create_conversation(args) do
+      {:ok, conversation_to_view(conversation, Actors.get_actor(actor_id))}
+    else
+      {:member, false} ->
+        {:error, :unauthorized}
+
+      {:error, :empty_participants} ->
+        {:error,
+         dgettext(
+           "errors",
+           "There are no participants matching the audience you've selected."
+         )}
+
+      {:error, err} ->
+        {:error, err}
+    end
+  end
+
+  def send_private_messages_to_participants(_parent, _args, _resolution),
+    do: {:error, :unauthorized}
+
+  defp conversation_to_view(
+         %Conversation{id: conversation_id} = conversation,
+         %Actor{id: actor_id} = actor
+       ) do
+    value =
+      conversation
+      |> Map.from_struct()
+      |> Map.put(:actor, actor)
+      |> Map.put(:unread, false)
+      |> Map.put(
+        :conversation_participant_id,
+        Conversations.get_participant_by_conversation_and_actor(conversation_id, actor_id).id
+      )
+
+    struct(ConversationView, value)
+  end
+
  @spec valid_email?(String.t() | nil) :: boolean
  defp valid_email?(email) when is_nil(email), do: false

--- a/lib/graphql/schema.ex
+++ b/lib/graphql/schema.ex
@ -55,6 +55,7 @@ defmodule Mobilizon.GraphQL.Schema do
  import_types(Schema.Users.ActivitySetting)
  import_types(Schema.FollowedGroupActivityType)
  import_types(Schema.AuthApplicationType)
+  import_types(Schema.ConversationType)

  @desc "A struct containing the id of the deleted object"
  object :deleted_object do
@ -165,6 +166,7 @@ defmodule Mobilizon.GraphQL.Schema do
    import_fields(:todo_list_queries)
    import_fields(:todo_queries)
    import_fields(:discussion_queries)
+    import_fields(:conversation_queries)
    import_fields(:resource_queries)
    import_fields(:post_queries)
    import_fields(:statistics_queries)
@ -189,6 +191,7 @@ defmodule Mobilizon.GraphQL.Schema do
    import_fields(:todo_list_mutations)
    import_fields(:todo_mutations)
    import_fields(:discussion_mutations)
+    import_fields(:conversation_mutations)
    import_fields(:resource_mutations)
    import_fields(:post_mutations)
    import_fields(:actor_mutations)
@ -204,6 +207,7 @@ defmodule Mobilizon.GraphQL.Schema do
  subscription do
    import_fields(:person_subscriptions)
    import_fields(:discussion_subscriptions)
+    import_fields(:conversation_subscriptions)
  end

  @spec middleware(list(module()), any(), map()) :: list(module())
--- a/lib/graphql/schema/actors/person.ex
+++ b/lib/graphql/schema/actors/person.ex
@ -7,7 +7,7 @@ defmodule Mobilizon.GraphQL.Schema.Actors.PersonType do
  import Absinthe.Resolution.Helpers, only: [dataloader: 2]

  alias Mobilizon.Events
-  alias Mobilizon.GraphQL.Resolvers.{Media, Person}
+  alias Mobilizon.GraphQL.Resolvers.{Conversation, Media, Person}
  alias Mobilizon.GraphQL.Schema

  import_types(Schema.Events.FeedTokenType)
@ -136,6 +136,25 @@ defmodule Mobilizon.GraphQL.Schema.Actors.PersonType do
      arg(:limit, :integer, default_value: 10, description: "The limit of follows per page")
      resolve(&Person.person_follows/3)
    end
+
+    @desc "The list of conversations this person has"
+    field(:conversations, :paginated_conversation_list,
+      meta: [private: true, rule: :"read:profile:conversations"]
+    ) do
+      arg(:page, :integer,
+        default_value: 1,
+        description: "The page in the conversations list"
+      )
+
+      arg(:limit, :integer, default_value: 10, description: "The limit of conversations per page")
+      resolve(&Conversation.list_conversations/3)
+    end
+
+    field(:unread_conversations_count, :integer,
+      meta: [private: true, rule: :"read:profile:conversations"]
+    ) do
+      resolve(&Conversation.unread_conversations_count/3)
+    end
  end

  @desc """
@ -353,5 +372,16 @@ defmodule Mobilizon.GraphQL.Schema.Actors.PersonType do
        {:ok, topic: [args.group, args.person_id]}
      end)
    end
+
+    @desc "Notify when a person unread conversations count changed"
+    field(:person_unread_conversations_count, :integer,
+      meta: [private: true, rule: :"read:profile:conversations"]
+    ) do
+      arg(:person_id, non_null(:id), description: "The person's ID")
+
+      config(fn args, _ ->
+        {:ok, topic: [args.person_id]}
+      end)
+    end
  end
 end
--- a/lib/graphql/schema/conversation.ex
+++ b/lib/graphql/schema/conversation.ex
@ -0,0 +1,132 @@
+defmodule Mobilizon.GraphQL.Schema.ConversationType do
+  @moduledoc """
+  Schema representation for conversation
+  """
+  use Absinthe.Schema.Notation
+
+  # import Absinthe.Resolution.Helpers, only: [dataloader: 1]
+
+  # alias Mobilizon.Actors
+  alias Mobilizon.GraphQL.Resolvers.Conversation
+
+  @desc "A conversation"
+  object :conversation do
+    meta(:authorize, :user)
+    interfaces([:activity_object])
+    field(:id, :id, description: "Internal ID for this conversation")
+
+    field(:conversation_participant_id, :id,
+      description: "Internal ID for the conversation participant"
+    )
+
+    field(:last_comment, :comment, description: "The last comment of the conversation")
+
+    field :comments, :paginated_comment_list do
+      arg(:page, :integer, default_value: 1)
+      arg(:limit, :integer, default_value: 10)
+      resolve(&Conversation.get_comments_for_conversation/3)
+      description("The comments for the conversation")
+    end
+
+    field(:participants, list_of(:person),
+      # resolve: dataloader(Actors),
+      description: "The list of participants to the conversation"
+    )
+
+    field(:event, :event, description: "The event this conversation is associated to")
+
+    field(:actor, :person,
+      # resolve: dataloader(Actors),
+      description: "The actor concerned by the conversation"
+    )
+
+    field(:unread, :boolean, description: "Whether this conversation is unread")
+
+    field(:inserted_at, :datetime, description: "When was this conversation's created")
+    field(:updated_at, :datetime, description: "When was this conversation's updated")
+  end
+
+  @desc "A paginated list of conversations"
+  object :paginated_conversation_list do
+    meta(:authorize, :user)
+    field(:elements, list_of(:conversation), description: "A list of conversations")
+    field(:total, :integer, description: "The total number of conversations in the list")
+  end
+
+  object :conversation_queries do
+    @desc "Get a conversation"
+    field :conversation, type: :conversation do
+      arg(:id, :id, description: "The conversation's ID")
+
+      middleware(Rajska.QueryAuthorization,
+        permit: :user,
+        scope: Mobilizon.Conversations.Conversation,
+        rule: :"read:conversations",
+        args: %{id: :id}
+      )
+
+      resolve(&Conversation.get_conversation/3)
+    end
+  end
+
+  object :conversation_mutations do
+    @desc "Post a private message"
+    field :post_private_message, type: :conversation do
+      arg(:text, non_null(:string), description: "The conversation's first comment body")
+      arg(:actor_id, non_null(:id), description: "The profile ID to create the conversation as")
+      arg(:attributed_to_id, :id, description: "The group ID to attribute the conversation to")
+      arg(:conversation_id, :id, description: "The conversation ID to reply to")
+      arg(:language, :string, description: "The comment language", default_value: "und")
+      arg(:mentions, list_of(:string), description: "A list of federated usernames to mention")
+
+      middleware(Rajska.QueryAuthorization,
+        permit: :user,
+        scope: Mobilizon.Conversations.ConversationParticipant,
+        rule: :"write:conversation:create",
+        args: %{actor_id: :actor_id}
+      )
+
+      resolve(&Conversation.create_conversation/3)
+    end
+
+    @desc "Update a conversation"
+    field :update_conversation, type: :conversation do
+      arg(:conversation_id, non_null(:id), description: "The conversation's ID")
+      arg(:read, non_null(:boolean), description: "Whether the conversation is read or not")
+
+      middleware(Rajska.QueryAuthorization,
+        permit: :user,
+        scope: Mobilizon.Conversations.Conversation,
+        rule: :"write:conversation:update",
+        args: %{id: :conversation_id}
+      )
+
+      resolve(&Conversation.update_conversation/3)
+    end
+
+    @desc "Delete a conversation"
+    field :delete_conversation, type: :conversation do
+      arg(:conversation_id, non_null(:id), description: "The conversation's ID")
+
+      middleware(Rajska.QueryAuthorization,
+        permit: :user,
+        scope: Mobilizon.Conversations.Conversation,
+        rule: :"write:conversation:delete",
+        args: %{id: :conversation_id}
+      )
+
+      resolve(&Conversation.delete_conversation/3)
+    end
+  end
+
+  object :conversation_subscriptions do
+    @desc "Notify when a conversation changed"
+    field :conversation_comment_changed, :conversation do
+      arg(:id, non_null(:id), description: "The conversation's ID")
+
+      config(fn args, _ ->
+        {:ok, topic: args.id}
+      end)
+    end
+  end
+end
--- a/lib/graphql/schema/discussions/comment.ex
+++ b/lib/graphql/schema/discussions/comment.ex
@ -56,6 +56,8 @@ defmodule Mobilizon.GraphQL.Schema.Discussions.CommentType do
      description: "Whether this comment needs to be announced to participants"
    )

+    field(:conversation, :conversation, description: "The conversation this comment is part of")
+
    field(:language, :string, description: "The comment language")
  end

--- a/lib/graphql/schema/event.ex
+++ b/lib/graphql/schema/event.ex
@ -8,7 +8,7 @@ defmodule Mobilizon.GraphQL.Schema.EventType do
  import Absinthe.Resolution.Helpers, only: [dataloader: 1, dataloader: 2]

  alias Mobilizon.{Actors, Addresses, Discussions}
-  alias Mobilizon.GraphQL.Resolvers.{Event, Media, Tag}
+  alias Mobilizon.GraphQL.Resolvers.{Conversation, Event, Media, Tag}
  alias Mobilizon.GraphQL.Schema

  import_types(Schema.AddressType)
@ -113,6 +113,18 @@ defmodule Mobilizon.GraphQL.Schema.EventType do
    field(:options, :event_options, description: "The event options")
    field(:metadata, list_of(:event_metadata), description: "A key-value list of metadata")
    field(:language, :string, description: "The event language")
+
+    field(:conversations, :paginated_conversation_list,
+      description: "The list of conversations started on this event"
+    ) do
+      arg(:page, :integer,
+        default_value: 1,
+        description: "The page in the paginated conversation list"
+      )
+
+      arg(:limit, :integer, default_value: 10, description: "The limit of conversations per page")
+      resolve(&Conversation.find_conversations_for_event/3)
+    end
  end

  @desc "The list of visibility options for an event"
--- a/lib/graphql/schema/events/participant.ex
+++ b/lib/graphql/schema/events/participant.ex
@ -159,5 +159,34 @@ defmodule Mobilizon.GraphQL.Schema.Events.ParticipantType do

      resolve(&Participant.export_event_participants/3)
    end
+
+    @desc "Send private messages to participants"
+    field :send_event_private_message, :conversation do
+      arg(:event_id, non_null(:id),
+        description: "The ID from the event for which to export participants"
+      )
+
+      arg(:roles, list_of(:participant_role_enum),
+        default_value: [],
+        description: "The participant roles to include"
+      )
+
+      arg(:text, non_null(:string), description: "The private message body")
+
+      arg(:actor_id, non_null(:id),
+        description: "The profile ID to create the private message as"
+      )
+
+      arg(:language, :string, description: "The private message language", default_value: "und")
+
+      middleware(Rajska.QueryAuthorization,
+        permit: :user,
+        scope: Mobilizon.Events.Event,
+        rule: :"write:event:participants:private_message",
+        args: %{id: :event_id}
+      )
+
+      resolve(&Participant.send_private_messages_to_participants/3)
+    end
  end
 end
--- a/lib/graphql/schema/user.ex
+++ b/lib/graphql/schema/user.ex
@ -8,7 +8,7 @@ defmodule Mobilizon.GraphQL.Schema.UserType do

  alias Mobilizon.Events
  alias Mobilizon.GraphQL.Resolvers.Application, as: ApplicationResolver
-  alias Mobilizon.GraphQL.Resolvers.{Media, User}
+  alias Mobilizon.GraphQL.Resolvers.{Conversation, Media, User}
  alias Mobilizon.GraphQL.Resolvers.Users.ActivitySettings
  alias Mobilizon.GraphQL.Schema

@ -191,6 +191,19 @@ defmodule Mobilizon.GraphQL.Schema.UserType do
    ) do
      resolve(&ApplicationResolver.get_user_applications/3)
    end
+
+    @desc "The list of conversations this person has"
+    field(:conversations, :paginated_conversation_list,
+      meta: [private: true, rule: :"read:profile:conversations"]
+    ) do
+      arg(:page, :integer,
+        default_value: 1,
+        description: "The page in the conversations list"
+      )
+
+      arg(:limit, :integer, default_value: 10, description: "The limit of conversations per page")
+      resolve(&Conversation.list_conversations/3)
+    end
  end

  @desc "The list of roles an user can have"
--- a/lib/mobilizon/activities/activities.ex
+++ b/lib/mobilizon/activities/activities.ex
@ -17,10 +17,24 @@ defmodule Mobilizon.Activities do
    very_high: 50
  )

-  @activity_types ["event", "post", "discussion", "resource", "group", "member", "comment"]
+  @activity_types [
+    "event",
+    "post",
+    "conversation",
+    "discussion",
+    "resource",
+    "group",
+    "member",
+    "comment"
+  ]
  @event_activity_subjects ["event_created", "event_updated", "event_deleted", "comment_posted"]
  @participant_activity_subjects ["event_new_participation"]
  @post_activity_subjects ["post_created", "post_updated", "post_deleted"]
+  @conversation_activity_subjects [
+    "conversation_created",
+    "conversation_replied",
+    "conversation_event_announcement"
+  ]
  @discussion_activity_subjects [
    "discussion_created",
    "discussion_replied",
@ -49,6 +63,7 @@ defmodule Mobilizon.Activities do
  @settings_activity_subjects ["group_created", "group_updated"]

  @subjects @event_activity_subjects ++
+              @conversation_activity_subjects ++
              @participant_activity_subjects ++
              @post_activity_subjects ++
              @discussion_activity_subjects ++
@ -61,6 +76,7 @@ defmodule Mobilizon.Activities do
    "actor",
    "post",
    "discussion",
+    "conversation",
    "resource",
    "member",
    "group",
--- a/lib/mobilizon/actors/actor.ex
+++ b/lib/mobilizon/actors/actor.ex
@ -10,6 +10,7 @@ defmodule Mobilizon.Actors.Actor do
  alias Mobilizon.{Actors, Addresses, Config, Crypto, Mention, Share}
  alias Mobilizon.Actors.{ActorOpenness, ActorType, ActorVisibility, Follower, Member}
  alias Mobilizon.Addresses.Address
+  alias Mobilizon.Conversations.Conversation
  alias Mobilizon.Discussions.Comment
  alias Mobilizon.Events.{Event, FeedToken, Participant}
  alias Mobilizon.Medias.File
@ -196,6 +197,11 @@ defmodule Mobilizon.Actors.Actor do
    has_many(:owner_shares, Share, foreign_key: :owner_actor_id)
    many_to_many(:memberships, __MODULE__, join_through: Member)

+    many_to_many(:conversations, Conversation,
+      join_through: "conversation_participants",
+      join_keys: [conversation_id: :id, participant_id: :id]
+    )
+
    timestamps()
  end

--- a/lib/mobilizon/conversations/conversation.ex
+++ b/lib/mobilizon/conversations/conversation.ex
@ -0,0 +1,57 @@
+defmodule Mobilizon.Conversations.Conversation do
+  @moduledoc """
+  Represents a conversation
+  """
+
+  use Ecto.Schema
+
+  import Ecto.Changeset
+
+  alias Ecto.Changeset
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.ConversationParticipant
+  alias Mobilizon.Discussions.Comment
+  alias Mobilizon.Events.Event
+
+  @type t :: %__MODULE__{
+          id: String.t(),
+          origin_comment: Comment.t(),
+          last_comment: Comment.t(),
+          participants: list(Actor.t())
+        }
+
+  @required_attrs [:origin_comment_id, :last_comment_id]
+  @optional_attrs [:event_id]
+  @attrs @required_attrs ++ @optional_attrs
+
+  schema "conversations" do
+    belongs_to(:origin_comment, Comment)
+    belongs_to(:last_comment, Comment)
+    belongs_to(:event, Event)
+    has_many(:comments, Comment)
+
+    many_to_many(:participants, Actor,
+      join_through: ConversationParticipant,
+      join_keys: [conversation_id: :id, actor_id: :id],
+      on_replace: :delete
+    )
+
+    timestamps(type: :utc_datetime)
+  end
+
+  @doc false
+  @spec changeset(t | Ecto.Schema.t(), map) :: Ecto.Changeset.t()
+  def changeset(%__MODULE__{} = conversation, attrs) do
+    conversation
+    |> cast(attrs, @attrs)
+    |> maybe_set_participants(attrs)
+    |> validate_required(@required_attrs)
+  end
+
+  defp maybe_set_participants(%Changeset{} = changeset, %{participants: participants})
+       when length(participants) > 0 do
+    put_assoc(changeset, :participants, participants)
+  end
+
+  defp maybe_set_participants(%Changeset{} = changeset, _), do: changeset
+end
--- a/lib/mobilizon/conversations/conversation_participant.ex
+++ b/lib/mobilizon/conversations/conversation_participant.ex
@ -0,0 +1,40 @@
+defmodule Mobilizon.Conversations.ConversationParticipant do
+  @moduledoc """
+  Represents a conversation participant
+  """
+
+  use Ecto.Schema
+
+  import Ecto.Changeset
+
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.Conversation
+
+  @type t :: %__MODULE__{
+          conversation: Conversation.t(),
+          actor: Actor.t(),
+          unread: boolean()
+        }
+
+  @required_attrs [:actor_id, :conversation_id]
+  @optional_attrs [:unread]
+  @attrs @required_attrs ++ @optional_attrs
+
+  schema "conversation_participants" do
+    belongs_to(:conversation, Conversation)
+    belongs_to(:actor, Actor)
+    field(:unread, :boolean, default: true)
+
+    timestamps(type: :utc_datetime)
+  end
+
+  @doc false
+  @spec changeset(t | Ecto.Schema.t(), map) :: Ecto.Changeset.t()
+  def changeset(%__MODULE__{} = conversation, attrs) do
+    conversation
+    |> cast(attrs, @attrs)
+    |> validate_required(@required_attrs)
+    |> foreign_key_constraint(:conversation_id)
+    |> foreign_key_constraint(:actor_id)
+  end
+end
--- a/lib/mobilizon/conversations/conversation_view.ex
+++ b/lib/mobilizon/conversations/conversation_view.ex
@ -0,0 +1,22 @@
+defmodule Mobilizon.Conversations.ConversationView do
+  @moduledoc """
+  Represents a conversation view for GraphQL API
+  """
+
+  defstruct [
+    :id,
+    :conversation_participant_id,
+    :origin_comment,
+    :origin_comment_id,
+    :last_comment,
+    :last_comment_id,
+    :event,
+    :event_id,
+    :actor,
+    :actor_id,
+    :unread,
+    :inserted_at,
+    :updated_at,
+    :participants
+  ]
+end
--- a/lib/mobilizon/conversations/conversations.ex
+++ b/lib/mobilizon/conversations/conversations.ex
@ -0,0 +1,344 @@
+defmodule Mobilizon.Conversations do
+  @moduledoc """
+  The conversations context
+  """
+
+  import Ecto.Query
+
+  alias Ecto.Changeset
+  alias Ecto.Multi
+  alias Mobilizon.Actors.{Actor, Member}
+  alias Mobilizon.Conversations.{Conversation, ConversationParticipant}
+  alias Mobilizon.Discussions.Comment
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Storage.{Page, Repo}
+
+  @conversation_preloads [
+    :origin_comment,
+    :last_comment,
+    :event,
+    :participants
+  ]
+
+  @comment_preloads [
+    :actor,
+    :event,
+    :attributed_to,
+    :in_reply_to_comment,
+    :origin_comment,
+    :replies,
+    :tags,
+    :mentions,
+    :media
+  ]
+
+  @doc """
+  Get a conversation by it's ID
+  """
+  @spec get_conversation(String.t() | integer()) :: Conversation.t() | nil
+  def get_conversation(conversation_id) do
+    Conversation
+    |> Repo.get(conversation_id)
+    |> Repo.preload(@conversation_preloads)
+  end
+
+  @doc """
+  Get a conversation by it's ID
+  """
+  @spec get_conversation_participant(String.t() | integer()) :: Conversation.t() | nil
+  def get_conversation_participant(conversation_participant_id) do
+    preload_conversation_participant_details()
+    |> where([cp], cp.id == ^conversation_participant_id)
+    |> Repo.one()
+  end
+
+  def get_participant_by_conversation_and_actor(conversation_id, actor_id) do
+    preload_conversation_participant_details()
+    |> where([cp], cp.conversation_id == ^conversation_id and cp.actor_id == ^actor_id)
+    |> Repo.one()
+  end
+
+  defp preload_conversation_participant_details do
+    ConversationParticipant
+    |> join(:inner, [cp], c in Conversation, on: cp.conversation_id == c.id)
+    |> join(:left, [_cp, c], e in Event, on: c.event_id == e.id)
+    |> join(:inner, [cp], a in Actor, on: cp.actor_id == a.id)
+    |> join(:inner, [_cp, c], lc in Comment, on: c.last_comment_id == lc.id)
+    |> join(:inner, [_cp, c], oc in Comment, on: c.origin_comment_id == oc.id)
+    |> join(:inner, [_cp, c], p in ConversationParticipant, on: c.id == p.conversation_id)
+    |> join(:inner, [_cp, _c, _e, _a, _lc, _oc, p], ap in Actor, on: p.actor_id == ap.id)
+    |> preload([_cp, c, e, a, lc, oc, p, ap],
+      actor: a,
+      conversation:
+        {c, event: e, last_comment: lc, origin_comment: oc, participants: {p, actor: ap}}
+    )
+  end
+
+  @doc """
+  Get a paginated list of conversations for an actor
+  """
+  @spec find_conversations_for_actor(Actor.t(), integer | nil, integer | nil) ::
+          Page.t(Conversation.t())
+  def find_conversations_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
+    Conversation
+    |> where([c], c.actor_id == ^actor_id)
+    |> preload(^@conversation_preloads)
+    |> order_by(desc: :updated_at)
+    |> Page.build_page(page, limit)
+  end
+
+  @spec find_conversations_for_event(
+          String.t() | integer,
+          String.t() | integer,
+          integer | nil,
+          integer | nil
+        ) :: Page.t(ConversationParticipant.t())
+  def find_conversations_for_event(event_id, actor_id, page \\ nil, limit \\ nil) do
+    ConversationParticipant
+    |> join(:inner, [cp], c in Conversation, on: cp.conversation_id == c.id)
+    |> join(:left, [_cp, c], e in Event, on: c.event_id == e.id)
+    |> join(:inner, [cp], a in Actor, on: cp.actor_id == a.id)
+    |> join(:inner, [_cp, c], lc in Comment, on: c.last_comment_id == lc.id)
+    |> join(:inner, [_cp, c], oc in Comment, on: c.origin_comment_id == oc.id)
+    |> join(:inner, [_cp, c], p in ConversationParticipant, on: c.id == p.conversation_id)
+    |> join(:inner, [_cp, _c, _e, _a, _lc, _oc, p], ap in Actor, on: p.actor_id == ap.id)
+    |> where([_cp, c], c.event_id == ^event_id)
+    |> where([cp], cp.actor_id == ^actor_id)
+    |> preload([_cp, c, e, a, lc, oc, p, ap],
+      actor: a,
+      conversation:
+        {c, event: e, last_comment: lc, origin_comment: oc, participants: {p, actor: ap}}
+    )
+    |> Page.build_page(page, limit)
+  end
+
+  @spec list_conversation_participants_for_actor(
+          integer | String.t(),
+          integer | nil,
+          integer | nil
+        ) ::
+          Page.t(ConversationParticipant.t())
+  def list_conversation_participants_for_actor(actor_id, page \\ nil, limit \\ nil) do
+    subquery =
+      ConversationParticipant
+      |> distinct([cp], cp.conversation_id)
+      |> join(:left, [cp], m in Member, on: cp.actor_id == m.parent_id)
+      |> where([cp], cp.actor_id == ^actor_id)
+      |> or_where(
+        [_cp, m],
+        m.actor_id == ^actor_id and m.role in [:creator, :administrator, :moderator]
+      )
+
+    subquery
+    |> subquery()
+    |> order_by([cp], desc: cp.unread, desc: cp.updated_at)
+    |> preload([:actor, conversation: [:last_comment, :participants]])
+    |> Page.build_page(page, limit)
+  end
+
+  @spec list_conversation_participants_for_user(
+          integer | String.t(),
+          integer | nil,
+          integer | nil
+        ) ::
+          Page.t(ConversationParticipant.t())
+  def list_conversation_participants_for_user(user_id, page \\ nil, limit \\ nil) do
+    ConversationParticipant
+    |> join(:inner, [cp], a in Actor, on: cp.actor_id == a.id)
+    |> where([_cp, a], a.user_id == ^user_id)
+    |> preload([:actor, conversation: [:last_comment, :participants]])
+    |> Page.build_page(page, limit)
+  end
+
+  @spec list_conversation_participants_for_conversation(integer | String.t()) ::
+          list(ConversationParticipant.t())
+  def list_conversation_participants_for_conversation(conversation_id) do
+    ConversationParticipant
+    |> where([cp], cp.conversation_id == ^conversation_id)
+    |> Repo.all()
+  end
+
+  @spec count_unread_conversation_participants_for_person(integer | String.t()) ::
+          non_neg_integer()
+  def count_unread_conversation_participants_for_person(actor_id) do
+    ConversationParticipant
+    |> where([cp], cp.actor_id == ^actor_id and cp.unread == true)
+    |> Repo.aggregate(:count)
+  end
+
+  @doc """
+  Creates a conversation.
+  """
+  @spec create_conversation(map()) ::
+          {:ok, Conversation.t()} | {:error, atom(), Changeset.t(), map()}
+  def create_conversation(attrs) do
+    with {:ok, %{comment: %Comment{} = _comment, conversation: %Conversation{} = conversation}} <-
+           Multi.new()
+           |> Multi.insert(
+             :comment,
+             Comment.changeset(
+               %Comment{},
+               Map.merge(attrs, %{
+                 actor_id: attrs.actor_id,
+                 attributed_to_id: attrs.actor_id,
+                 visibility: :private
+               })
+             )
+           )
+           |> Multi.insert(:conversation, fn %{
+                                               comment: %Comment{
+                                                 id: comment_id,
+                                                 origin_comment_id: origin_comment_id
+                                               }
+                                             } ->
+             Conversation.changeset(
+               %Conversation{},
+               Map.merge(attrs, %{
+                 last_comment_id: comment_id,
+                 origin_comment_id: origin_comment_id || comment_id,
+                 participants: attrs.participants
+               })
+             )
+           end)
+           |> Multi.update(:update_comment, fn %{
+                                                 comment: %Comment{} = comment,
+                                                 conversation: %Conversation{id: conversation_id}
+                                               } ->
+             Comment.changeset(
+               comment,
+               %{conversation_id: conversation_id}
+             )
+           end)
+           |> Multi.update_all(
+             :conversation_participants,
+             fn %{
+                  conversation: %Conversation{
+                    id: conversation_id
+                  }
+                } ->
+               ConversationParticipant
+               |> where(
+                 [cp],
+                 cp.conversation_id == ^conversation_id and cp.actor_id == ^attrs.actor_id
+               )
+               |> update([cp], set: [unread: false, updated_at: ^NaiveDateTime.utc_now()])
+             end,
+             []
+           )
+           |> Repo.transaction(),
+         %Conversation{} = conversation <- Repo.preload(conversation, @conversation_preloads) do
+      {:ok, conversation}
+    end
+  end
+
+  @doc """
+  Create a response to a conversation
+  """
+  @spec reply_to_conversation(Conversation.t(), map()) ::
+          {:ok, Conversation.t()} | {:error, atom(), Ecto.Changeset.t(), map()}
+  def reply_to_conversation(%Conversation{id: conversation_id} = conversation, attrs \\ %{}) do
+    attrs =
+      Map.merge(attrs, %{
+        conversation_id: conversation_id,
+        actor_id: Map.get(attrs, :creator_id, Map.get(attrs, :actor_id)),
+        origin_comment_id: conversation.origin_comment_id,
+        in_reply_to_comment_id: conversation.last_comment_id,
+        visibility: :private
+      })
+
+    changeset =
+      Comment.changeset(
+        %Comment{},
+        attrs
+      )
+
+    with {:ok, %{comment: %Comment{} = comment, conversation: %Conversation{} = conversation}} <-
+           Multi.new()
+           |> Multi.insert(
+             :comment,
+             changeset
+           )
+           |> Multi.update(:conversation, fn %{comment: %Comment{id: comment_id}} ->
+             Conversation.changeset(
+               conversation,
+               %{last_comment_id: comment_id}
+             )
+           end)
+           |> Multi.update_all(
+             :conversation_participants,
+             fn %{
+                  conversation: %Conversation{
+                    id: conversation_id
+                  }
+                } ->
+               ConversationParticipant
+               |> where(
+                 [cp],
+                 cp.conversation_id == ^conversation_id and cp.actor_id != ^attrs.actor_id
+               )
+               |> update([cp], set: [unread: true, updated_at: ^NaiveDateTime.utc_now()])
+             end,
+             []
+           )
+           |> Multi.update_all(
+             :conversation_participants_author,
+             fn %{
+                  conversation: %Conversation{
+                    id: conversation_id
+                  }
+                } ->
+               ConversationParticipant
+               |> where(
+                 [cp],
+                 cp.conversation_id == ^conversation_id and cp.actor_id == ^attrs.actor_id
+               )
+               |> update([cp], set: [unread: false, updated_at: ^NaiveDateTime.utc_now()])
+             end,
+             []
+           )
+           |> Repo.transaction(),
+         # Conversation is not updated
+         %Comment{} = comment <- Repo.preload(comment, @comment_preloads) do
+      {:ok, %Conversation{conversation | last_comment: comment}}
+    end
+  end
+
+  @doc """
+  Update a conversation.
+  """
+  @spec update_conversation(Conversation.t(), map()) ::
+          {:ok, Conversation.t()} | {:error, Changeset.t()}
+  def update_conversation(%Conversation{} = conversation, attrs \\ %{}) do
+    conversation
+    |> Conversation.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Delete a conversation.
+  """
+  @spec delete_conversation(Conversation.t()) ::
+          {:ok, %{comments: {integer() | nil, any()}}} | {:error, :comments, Changeset.t(), map()}
+  def delete_conversation(%Conversation{id: conversation_id}) do
+    Multi.new()
+    |> Multi.delete_all(:comments, fn _ ->
+      where(Comment, [c], c.conversation_id == ^conversation_id)
+    end)
+    # |> Multi.delete(:conversation, conversation)
+    |> Repo.transaction()
+  end
+
+  @doc """
+  Update a conversation participant. Only their read status for now
+  """
+  @spec update_conversation_participant(ConversationParticipant.t(), map()) ::
+          {:ok, ConversationParticipant.t()} | {:error, Changeset.t()}
+  def update_conversation_participant(
+        %ConversationParticipant{} = conversation_participant,
+        attrs \\ %{}
+      ) do
+    conversation_participant
+    |> ConversationParticipant.changeset(attrs)
+    |> Repo.update()
+  end
+end
--- a/lib/mobilizon/discussions/comment.ex
+++ b/lib/mobilizon/discussions/comment.ex
@ -9,6 +9,7 @@ defmodule Mobilizon.Discussions.Comment do
  import Mobilizon.Storage.Ecto, only: [maybe_add_published_at: 1]

  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Conversations.Conversation
  alias Mobilizon.Discussions.{Comment, CommentVisibility, Discussion}
  alias Mobilizon.Events.{Event, Tag}
  alias Mobilizon.Medias.Media
@ -49,7 +50,9 @@ defmodule Mobilizon.Discussions.Comment do
    :local,
    :is_announcement,
    :discussion_id,
-    :language
+    :conversation_id,
+    :language,
+    :visibility
  ]
  @attrs @required_attrs ++ @optional_attrs

@ -71,16 +74,17 @@ defmodule Mobilizon.Discussions.Comment do
    belongs_to(:in_reply_to_comment, Comment, foreign_key: :in_reply_to_comment_id)
    belongs_to(:origin_comment, Comment, foreign_key: :origin_comment_id)
    belongs_to(:discussion, Discussion, type: :binary_id)
+    belongs_to(:conversation, Conversation)
    has_many(:replies, Comment, foreign_key: :origin_comment_id)
    many_to_many(:tags, Tag, join_through: "comments_tags", on_replace: :delete)
-    has_many(:mentions, Mention)
+    has_many(:mentions, Mention, on_replace: :delete)
    many_to_many(:media, Media, join_through: "comments_medias", on_replace: :delete)

    timestamps(type: :utc_datetime)
  end

  @doc """
-  Returns the id of the first comment in the discussion.
+  Returns the id of the first comment in the discussion or conversation.
  """
  @spec get_thread_id(t) :: integer
  def get_thread_id(%__MODULE__{id: id, origin_comment_id: origin_comment_id}) do
@ -181,7 +185,7 @@ defmodule Mobilizon.Discussions.Comment do
    Tag.changeset(%Tag{}, tag)
  end

-  defp process_mention(tag) do
-    Mention.changeset(%Mention{}, tag)
+  defp process_mention(mention) do
+    Mention.changeset(%Mention{}, mention)
  end
 end
--- a/lib/mobilizon/discussions/discussions.ex
+++ b/lib/mobilizon/discussions/discussions.ex
@ -42,9 +42,9 @@ defmodule Mobilizon.Discussions do
    :origin_comment,
    :replies,
    :tags,
-    :mentions,
    :discussion,
-    :media
+    :media,
+    mentions: [:actor]
  ]

  @discussion_preloads [
@ -76,6 +76,7 @@ defmodule Mobilizon.Discussions do
    Comment
    |> join(:left, [c], r in Comment, on: r.origin_comment_id == c.id)
    |> where([c, _], is_nil(c.in_reply_to_comment_id))
+    |> where([c], c.visibility in ^@public_visibility)
    # TODO: This was added because we don't want to count deleted comments in total_replies.
    # However, it also excludes all top-level comments with deleted replies from being selected
    # |> where([_, r], is_nil(r.deleted_at))
@ -197,9 +198,13 @@ defmodule Mobilizon.Discussions do
  """
  @spec update_comment(Comment.t(), map) :: {:ok, Comment.t()} | {:error, Changeset.t()}
  def update_comment(%Comment{} = comment, attrs) do
-    comment
-    |> Comment.update_changeset(attrs)
-    |> Repo.update()
+    with {:ok, %Comment{} = comment} <-
+           comment
+           |> Comment.update_changeset(attrs)
+           |> Repo.update(),
+         %Comment{} = comment <- Repo.preload(comment, @comment_preloads) do
+      {:ok, comment}
+    end
  end

  @doc """
@ -272,6 +277,19 @@ defmodule Mobilizon.Discussions do
    |> Page.build_page(page, limit)
  end

+  @doc """
+  Get all the comments contained into a discussion
+  """
+  @spec get_comments_in_reply_to_comment_id(integer, integer | nil, integer | nil) ::
+          Page.t(Comment.t())
+  def get_comments_in_reply_to_comment_id(origin_comment_id, page \\ nil, limit \\ nil) do
+    Comment
+    |> where([c], c.id == ^origin_comment_id)
+    |> or_where([c], c.origin_comment_id == ^origin_comment_id)
+    |> order_by(asc: :inserted_at)
+    |> Page.build_page(page, limit)
+  end
+
  @doc """
  Counts local comments under events
  """
--- a/lib/mobilizon/events/event.ex
+++ b/lib/mobilizon/events/event.ex
@ -13,6 +13,7 @@ defmodule Mobilizon.Events.Event do
  alias Mobilizon.{Addresses, Events, Medias, Mention}
  alias Mobilizon.Addresses.Address

+  alias Mobilizon.Conversations.Conversation
  alias Mobilizon.Discussions.Comment

  alias Mobilizon.Events.{
@ -126,6 +127,7 @@ defmodule Mobilizon.Events.Event do
    has_many(:sessions, Session)
    has_many(:mentions, Mention)
    has_many(:comments, Comment)
+    has_many(:conversations, Conversation)
    many_to_many(:contacts, Actor, join_through: "event_contacts", on_replace: :delete)
    many_to_many(:tags, Tag, join_through: "events_tags", on_replace: :delete)
    many_to_many(:participants, Actor, join_through: Participant)
--- a/lib/mobilizon/events/events.ex
+++ b/lib/mobilizon/events/events.ex
@ -871,6 +871,21 @@ defmodule Mobilizon.Events do
    |> Page.build_page(page, limit)
  end

+  @doc """
+  Returns the whole list of participants for an event.
+  Default behaviour is to not return :not_approved or :not_confirmed participants
+  """
+  @spec list_all_participants_for_event(String.t(), list(atom())) :: list(Participant.t())
+  def list_all_participants_for_event(
+        id,
+        roles \\ []
+      ) do
+    id
+    |> participants_for_event_query(roles)
+    |> preload([:actor, :event])
+    |> Repo.all()
+  end
+
  @spec list_actors_participants_for_event(String.t()) :: [Actor.t()]
  def list_actors_participants_for_event(id) do
    id
--- a/lib/mobilizon/mentions/mention.ex
+++ b/lib/mobilizon/mentions/mention.ex
@ -32,8 +32,8 @@ defmodule Mobilizon.Mention do

  @doc false
  @spec changeset(t | Ecto.Schema.t(), map) :: Ecto.Changeset.t()
-  def changeset(event, attrs) do
-    event
+  def changeset(mention, attrs) do
+    mention
    |> cast(attrs, @attrs)
    # TODO: Enforce having either event_id or comment_id
    |> validate_required(@required_attrs)
--- a/lib/mobilizon/reports/reports.ex
+++ b/lib/mobilizon/reports/reports.ex
@ -21,7 +21,14 @@ defmodule Mobilizon.Reports do
  def get_report(id) do
    Report
    |> Repo.get(id)
-    |> Repo.preload([:reported, :reporter, :manager, :events, :comments, :notes])
+    |> Repo.preload([
+      :reported,
+      :reporter,
+      :manager,
+      :events,
+      :notes,
+      comments: [conversation: [:participants]]
+    ])
  end

  @doc """
--- a/lib/service/activity/conversation.ex
+++ b/lib/service/activity/conversation.ex
@ -0,0 +1,95 @@
+defmodule Mobilizon.Service.Activity.Conversation do
+  @moduledoc """
+  Insert a conversation activity
+  """
+  alias Mobilizon.Conversations
+  alias Mobilizon.Conversations.{Conversation, ConversationParticipant}
+  alias Mobilizon.Discussions.Comment
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Service.Activity
+  alias Mobilizon.Service.Workers.LegacyNotifierBuilder
+
+  @behaviour Activity
+
+  @impl Activity
+  def insert_activity(conversation, options \\ [])
+
+  def insert_activity(
+        %Conversation{} = conversation,
+        options
+      ) do
+    subject = Keyword.fetch!(options, :subject)
+
+    send_participant_notifications(subject, conversation, conversation.last_comment, options)
+  end
+
+  def insert_activity(_, _), do: {:ok, nil}
+
+  @impl Activity
+  def get_object(conversation_id) do
+    Conversations.get_conversation(conversation_id)
+  end
+
+  # An actor is mentionned
+  @spec send_participant_notifications(String.t(), Discussion.t(), Comment.t(), Keyword.t()) ::
+          {:ok, Oban.Job.t()} | {:ok, :skipped}
+  defp send_participant_notifications(
+         subject,
+         %Conversation{
+           id: conversation_id
+         } = conversation,
+         %Comment{actor_id: actor_id},
+         _options
+       )
+       when subject in [
+              "conversation_created",
+              "conversation_replied",
+              "conversation_event_announcement"
+            ] do
+    # We need to send each notification individually as the conversation URL varies for each participant
+
+    conversation_id
+    |> Conversations.list_conversation_participants_for_conversation()
+    |> Enum.each(fn %ConversationParticipant{id: conversation_participant_id} =
+                      conversation_participant ->
+      LegacyNotifierBuilder.enqueue(
+        :legacy_notify,
+        %{
+          "subject" => subject,
+          "subject_params" =>
+            Map.merge(
+              %{
+                conversation_id: conversation_id,
+                conversation_participant_id: conversation_participant_id
+              },
+              event_subject_params(conversation)
+            ),
+          "type" => :conversation,
+          "object_type" => :conversation,
+          "author_id" => actor_id,
+          "object_id" => to_string(conversation_id),
+          "participant" => Map.take(conversation_participant, [:id, :actor_id])
+        }
+      )
+    end)
+
+    {:ok, :enqueued}
+  end
+
+  defp send_participant_notifications(_, _, _, _), do: {:ok, :skipped}
+
+  defp event_subject_params(%Conversation{
+         event: %Event{
+           id: conversation_event_id,
+           title: conversation_event_title,
+           uuid: conversation_event_uuid
+         }
+       }),
+       do: %{
+         conversation_event_id: conversation_event_id,
+         conversation_event_title: conversation_event_title,
+         conversation_event_uuid: conversation_event_uuid
+       }
+
+  defp event_subject_params(_), do: %{}
+end
--- a/lib/service/activity/renderer/conversation.ex
+++ b/lib/service/activity/renderer/conversation.ex
@ -0,0 +1,73 @@
+defmodule Mobilizon.Service.Activity.Renderer.Conversation do
+  @moduledoc """
+  Render a conversation activity
+  """
+  alias Mobilizon.Activities.Activity
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Service.Activity.Renderer
+  alias Mobilizon.Web.Endpoint
+  alias Mobilizon.Web.Router.Helpers, as: Routes
+  import Mobilizon.Web.Gettext, only: [dgettext: 3]
+
+  @behaviour Renderer
+
+  @impl Renderer
+  def render(%Activity{} = activity, options) do
+    locale = Keyword.get(options, :locale, "en")
+    Gettext.put_locale(locale)
+    profile = profile(activity)
+
+    case activity.subject do
+      :conversation_created ->
+        %{
+          body:
+            dgettext(
+              "activity",
+              "%{profile} sent you a message",
+              %{
+                profile: profile
+              }
+            ),
+          url: conversation_url(activity)
+        }
+
+      :conversation_replied ->
+        %{
+          body:
+            dgettext(
+              "activity",
+              "%{profile} replied to your message",
+              %{
+                profile: profile
+              }
+            ),
+          url: conversation_url(activity)
+        }
+
+      :conversation_event_announcement ->
+        %{
+          body:
+            dgettext(
+              "activity",
+              "%{profile} sent a private message about event %{event}",
+              %{
+                profile: profile,
+                event: event_title(activity)
+              }
+            ),
+          url: conversation_url(activity)
+        }
+    end
+  end
+
+  defp conversation_url(activity) do
+    Routes.page_url(
+      Endpoint,
+      :conversation,
+      activity.subject_params["conversation_id"]
+    )
+  end
+
+  defp profile(activity), do: Actor.display_name_and_username(activity.author)
+  defp event_title(activity), do: activity.subject_params["conversation_event_title"]
+end
--- a/lib/service/activity/renderer/renderer.ex
+++ b/lib/service/activity/renderer/renderer.ex
@ -51,17 +51,25 @@ defmodule Mobilizon.Service.Activity.Renderer do
    res
  end

+  @types_map %{
+    discussion: Discussion,
+    conversation: Conversation,
+    event: Event,
+    group: Group,
+    member: Member,
+    post: Post,
+    resource: Resource,
+    comment: Comment
+  }
+
  @spec do_render(Activity.t(), Keyword.t()) :: common_render()
  defp do_render(%Activity{type: type} = activity, options) do
-    case type do
-      :discussion -> Discussion.render(activity, options)
-      :event -> Event.render(activity, options)
-      :group -> Group.render(activity, options)
-      :member -> Member.render(activity, options)
-      :post -> Post.render(activity, options)
-      :resource -> Resource.render(activity, options)
-      :comment -> Comment.render(activity, options)
-      _ -> nil
+    case Map.get(@types_map, type) do
+      nil ->
+        nil
+
+      mod ->
+        mod.render(activity, options)
    end
  end
 end
--- a/lib/service/formatter/html.ex
+++ b/lib/service/formatter/html.ex
@ -14,6 +14,8 @@ defmodule Mobilizon.Service.Formatter.HTML do

  def filter_tags(html), do: Sanitizer.scrub(html, DefaultScrubbler)

+  defdelegate basic_html(html), to: FastSanitize
+
  @spec strip_tags(String.t()) :: String.t() | no_return()
  def strip_tags(html) do
    case FastSanitize.strip_tags(html) do
@ -39,5 +41,17 @@ defmodule Mobilizon.Service.Formatter.HTML do

  def strip_tags_and_insert_spaces(html), do: html

+  @spec html_to_text(String.t()) :: String.t()
+  def html_to_text(html) do
+    html
+    |> String.replace(~r/<li>/, "\\g{1}- ", global: true)
+    |> String.replace(
+      ~r/<\/?\s?br>|<\/\s?p>|<\/\s?li>|<\/\s?div>|<\/\s?h.>/,
+      "\\g{1}\n\r",
+      global: true
+    )
+    |> strip_tags()
+  end
+
  def filter_tags_for_oembed(html), do: Sanitizer.scrub(html, OEmbed)
 end
--- a/lib/service/formatter/text.ex
+++ b/lib/service/formatter/text.ex
@ -0,0 +1,36 @@
+defmodule Mobilizon.Service.Formatter.Text do
+  @moduledoc """
+  Helps to format text blocks
+
+  Inspired from https://elixirforum.com/t/is-there-are-text-wrapping-library-for-elixir/21733/4
+  Using the Knuth-Plass Line Wrapping Algorithm https://www.students.cs.ubc.ca/~cs-490/2015W2/lectures/Knuth.pdf
+  """
+
+  def quote_paragraph(string, max_line_length) do
+    paragraph(string, max_line_length, "> ")
+  end
+
+  def paragraph(string, max_line_length, prefix \\ "") do
+    string
+    |> String.split("\n\n", trim: true)
+    |> Enum.map_join("\n#{prefix}\n", &subparagraph(&1, max_line_length, prefix))
+  end
+
+  defp subparagraph(string, max_line_length, prefix) do
+    [word | rest] = String.split(string, ~r/\s+/, trim: true)
+
+    rest
+    |> lines_assemble(max_line_length - String.length(prefix), String.length(word), word, [])
+    |> Enum.map_join("\n", &"#{prefix}#{&1}")
+  end
+
+  defp lines_assemble([], _, _, line, acc), do: [line | acc] |> Enum.reverse()
+
+  defp lines_assemble([word | rest], max, line_length, line, acc) do
+    if line_length + 1 + String.length(word) > max do
+      lines_assemble(rest, max, String.length(word), word, [line | acc])
+    else
+      lines_assemble(rest, max, line_length + 1 + String.length(word), line <> " " <> word, acc)
+    end
+  end
+end
--- a/lib/service/notifier/email.ex
+++ b/lib/service/notifier/email.ex
@ -70,6 +70,9 @@ defmodule Mobilizon.Service.Notifier.Email do
  @always_direct_subjects [
    :participation_event_comment,
    :event_comment_mention,
+    :conversation_mention,
+    :conversation_created,
+    :conversation_replied,
    :discussion_mention,
    :event_new_comment
  ]
@ -175,6 +178,9 @@ defmodule Mobilizon.Service.Notifier.Email do
    "member_updated" => false,
    "user_email_password_updated" => true,
    "event_comment_mention" => true,
+    "conversation_mention" => true,
+    "conversation_created" => true,
+    "conversation_replied" => true,
    "discussion_mention" => true,
    "event_new_comment" => true
  }
--- a/lib/service/notifier/filter.ex
+++ b/lib/service/notifier/filter.ex
@ -33,6 +33,10 @@ defmodule Mobilizon.Service.Notifier.Filter do
  defp map_activity_to_activity_setting(%Activity{subject: :event_comment_mention}),
    do: "event_comment_mention"

+  defp map_activity_to_activity_setting(%Activity{subject: subject})
+       when subject in [:conversation_mention, :conversation_created, :conversation_replied],
+       do: to_string(subject)
+
  defp map_activity_to_activity_setting(%Activity{subject: :discussion_mention}),
    do: "discussion_mention"

--- a/lib/service/notifier/push.ex
+++ b/lib/service/notifier/push.ex
@ -64,6 +64,7 @@ defmodule Mobilizon.Service.Notifier.Push do
    "member_updated" => false,
    "user_email_password_updated" => false,
    "event_comment_mention" => true,
+    "conversation_mention" => true,
    "discussion_mention" => false,
    "event_new_comment" => false
  }
--- a/lib/service/workers/legacy_notifier_builder.ex
+++ b/lib/service/workers/legacy_notifier_builder.ex
@ -8,6 +8,7 @@ defmodule Mobilizon.Service.Workers.LegacyNotifierBuilder do
  alias Mobilizon.Actors.Actor
  alias Mobilizon.Events.{Event, Participant}
  alias Mobilizon.Service.Notifier
+  require Logger

  use Mobilizon.Service.Workers.Helper, queue: "activity"

@ -15,14 +16,22 @@ defmodule Mobilizon.Service.Workers.LegacyNotifierBuilder do
  def perform(%Job{args: args}) do
    {"legacy_notify", args} = Map.pop(args, "op")
    activity = build_activity(args)
+    Logger.debug("Handling activity #{activity.subject} to notify in LegacyNotifierBuilder")

    if args["subject"] == "participation_event_comment" do
      notify_anonymous_participants(get_in(args, ["subject_params", "event_id"]), activity)
    end

+    if args["subject"] == "conversation_created" do
+      notify_anonymous_participants(
+        get_in(args, ["subject_params", "conversation_event_id"]),
+        activity
+      )
+    end
+
    args
    |> users_to_notify(author_id: args["author_id"], group_id: Map.get(args, "group_id"))
-    |> Enum.each(&Notifier.notify(&1, activity, single_activity: true))
+    |> Enum.each(&notify_user(&1, activity))
  end

  defp build_activity(args) do
@ -48,6 +57,15 @@ defmodule Mobilizon.Service.Workers.LegacyNotifierBuilder do
    users_from_actor_ids(mentionned_actor_ids, Keyword.fetch!(options, :author_id))
  end

+  @spec users_to_notify(map(), Keyword.t()) :: list(Users.t())
+  defp users_to_notify(
+         %{"subject" => subject, "participant" => %{"actor_id" => actor_id}},
+         options
+       )
+       when subject in ["conversation_created", "conversation_replied"] do
+    users_from_actor_ids([actor_id], Keyword.fetch!(options, :author_id))
+  end
+
  defp users_to_notify(
         %{"subject" => "discussion_mention", "mentions" => mentionned_actor_ids},
         options
@ -114,4 +132,9 @@ defmodule Mobilizon.Service.Workers.LegacyNotifierBuilder do
      )
    end)
  end
+
+  defp notify_user(user, activity) do
+    Logger.debug("Notifying #{user.email} for activity #{activity.subject}")
+    Notifier.notify(user, activity, single_activity: true)
+  end
 end
--- a/lib/web/auth/context.ex
+++ b/lib/web/auth/context.ex
@ -44,7 +44,7 @@ defmodule Mobilizon.Web.Auth.Context do

    context = if is_nil(user_agent), do: context, else: Map.put(context, :user_agent, user_agent)

-    put_private(conn, :absinthe, %{context: context})
+    Absinthe.Plug.put_options(conn, context: context)
  end

  defp set_user_context({conn, context}, %User{id: user_id, email: user_email} = user) do
--- a/lib/web/cache/activity_pub.ex
+++ b/lib/web/cache/activity_pub.ex
@ -3,9 +3,10 @@ defmodule Mobilizon.Web.Cache.ActivityPub do
  ActivityPub related cache.
  """

-  alias Mobilizon.{Actors, Discussions, Events, Posts, Resources, Todos, Tombstone}
+  alias Mobilizon.{Actors, Conversations, Discussions, Events, Posts, Resources, Todos, Tombstone}
  alias Mobilizon.Actors.Actor, as: ActorModel
  alias Mobilizon.Actors.Member
+  alias Mobilizon.Conversations.Conversation
  alias Mobilizon.Discussions.{Comment, Discussion}
  alias Mobilizon.Events.Event
  alias Mobilizon.Federation.ActivityPub.{Actor, Relay}
@ -184,6 +185,23 @@ defmodule Mobilizon.Web.Cache.ActivityPub do
    end)
  end

+  @doc """
+  Gets a conversation participant by it's ID, with all associations loaded.
+  """
+  @spec get_conversation_by_id_with_preload(String.t()) ::
+          {:commit, Todo.t()} | {:ignore, nil}
+  def get_conversation_by_id_with_preload(id) do
+    Cachex.fetch(@cache, "conversation_participant_" <> id, fn "conversation_participant_" <> id ->
+      case Conversations.get_conversation_participant(id) do
+        %Conversation{} = conversation ->
+          {:commit, conversation}
+
+        nil ->
+          {:ignore, nil}
+      end
+    end)
+  end
+
  @doc """
  Gets a member by its UUID, with all associations loaded.
  """
--- a/lib/web/cache/cache.ex
+++ b/lib/web/cache/cache.ex
@ -4,6 +4,7 @@ defmodule Mobilizon.Web.Cache do
  """

  alias Mobilizon.Actors.{Actor, Member}
+  alias Mobilizon.Conversations.Conversation
  alias Mobilizon.Discussions.{Comment, Discussion}
  alias Mobilizon.Events.Event
  alias Mobilizon.Posts.Post
@ -27,6 +28,10 @@ defmodule Mobilizon.Web.Cache do
  defdelegate get_todo_list_by_uuid_with_preload(uuid), to: ActivityPub
  @spec get_todo_by_uuid_with_preload(binary) :: {:commit, Todo.t()} | {:ignore, nil}
  defdelegate get_todo_by_uuid_with_preload(uuid), to: ActivityPub
+
+  @spec get_conversation_by_id_with_preload(binary) ::
+          {:commit, Conversation.t()} | {:ignore, nil}
+  defdelegate get_conversation_by_id_with_preload(uuid), to: ActivityPub
  @spec get_member_by_uuid_with_preload(binary) :: {:commit, Member.t()} | {:ignore, nil}
  defdelegate get_member_by_uuid_with_preload(uuid), to: ActivityPub
  @spec get_post_by_slug_with_preload(binary) :: {:commit, Post.t()} | {:ignore, nil}
--- a/lib/web/channels/graphql_socket.ex
+++ b/lib/web/channels/graphql_socket.ex
@ -13,9 +13,7 @@ defmodule Mobilizon.Web.GraphQLSocket do
    with {:ok, authed_socket} <-
           Guardian.Phoenix.Socket.authenticate(socket, Mobilizon.Web.Auth.Guardian, token),
         resource <- Guardian.Phoenix.Socket.current_resource(authed_socket) do
-      set_context(authed_socket, resource)
-
-      {:ok, authed_socket}
+      {:ok, set_context(authed_socket, resource)}
    else
      {:error, _} ->
        :error
@ -24,8 +22,17 @@ defmodule Mobilizon.Web.GraphQLSocket do

  def connect(_args, _socket), do: :error

-  @spec id(any) :: nil
-  def id(_socket), do: nil
+  @spec id(Phoenix.Socket.t()) :: String.t() | nil
+  def id(%Phoenix.Socket{assigns: assigns}) do
+    context = Keyword.get(assigns.absinthe.opts, :context)
+    current_user = Map.get(context, :current_user)
+
+    if current_user do
+      "user_socket:#{current_user.id}"
+    else
+      nil
+    end
+  end

  @spec set_context(Phoenix.Socket.t(), User.t() | ApplicationToken.t()) :: Phoenix.Socket.t()
  defp set_context(socket, %User{} = user) do
--- a/lib/web/controllers/page_controller.ex
+++ b/lib/web/controllers/page_controller.ex
@ -85,6 +85,12 @@ defmodule Mobilizon.Web.PageController do
    render_or_error(conn, &checks?/3, status, :todo, todo)
  end

+  @spec conversation(Plug.Conn.t(), map()) :: Plug.Conn.t() | {:error, :not_found}
+  def conversation(conn, %{"id" => slug}) do
+    {status, conversation} = Cache.get_conversation_by_id_with_preload(slug)
+    render_or_error(conn, &checks?/3, status, :conversation, conversation)
+  end
+
  @typep collections :: :resources | :posts | :discussions | :events | :todos

  @spec resources(Plug.Conn.t(), map()) :: Plug.Conn.t()
--- a/lib/web/email/activity.ex
+++ b/lib/web/email/activity.ex
@ -10,6 +10,7 @@ defmodule Mobilizon.Web.Email.Activity do
  alias Mobilizon.Actors.Actor
  alias Mobilizon.Config
  alias Mobilizon.Web.Email
+  require Logger

  @spec direct_activity(String.t(), list(), Keyword.t()) :: Swoosh.Email.t()
  def direct_activity(
@ -39,6 +40,36 @@ defmodule Mobilizon.Web.Email.Activity do
  end

  @spec anonymous_activity(String.t(), Activity.t(), Keyword.t()) :: Swoosh.Email.t()
+  def anonymous_activity(
+        email,
+        %Activity{subject_params: subject_params, type: :conversation} = activity,
+        options
+      ) do
+    locale = Keyword.get(options, :locale, "en")
+
+    subject =
+      dgettext(
+        "activity",
+        "Informations about your event %{event}",
+        event: subject_params["conversation_event_title"]
+      )
+
+    conversation = Mobilizon.Conversations.get_conversation(activity.object_id)
+
+    Logger.debug("Going to send anonymous activity of type #{activity.type} to #{email}")
+
+    [to: email, subject: subject]
+    |> Email.base_email()
+    |> render_body(:email_anonymous_activity, %{
+      subject: subject,
+      activity: activity,
+      locale: locale,
+      extra: %{
+        "conversation" => conversation
+      }
+    })
+  end
+
  def anonymous_activity(email, %Activity{subject_params: subject_params} = activity, options) do
    locale = Keyword.get(options, :locale, "en")

@ -49,6 +80,8 @@ defmodule Mobilizon.Web.Email.Activity do
        event: subject_params["event_title"]
      )

+    Logger.debug("Going to send anonymous activity of type #{activity.type} to #{email}")
+
    [to: email, subject: subject]
    |> Email.base_email()
    |> render_body(:email_anonymous_activity, %{
--- a/lib/web/endpoint.ex
+++ b/lib/web/endpoint.ex
@ -10,6 +10,21 @@ defmodule Mobilizon.Web.Endpoint do
  use Phoenix.Endpoint, otp_app: :mobilizon
  use Absinthe.Phoenix.Endpoint

+  # Serve at "/" the static files from "priv/static" directory.
+  #
+  # You should set gzip to true if you are running phoenix.digest
+  # when deploying your static files in production.
+  plug(
+    Plug.Static,
+    at: "/",
+    from: {:mobilizon, "priv/static"},
+    gzip: false,
+    only: Mobilizon.Web.static_paths()
+    # only_matching: ["precache-manifest"]
+  )
+
+  plug(Mobilizon.Web.Plugs.UploadedMedia)
+
  plug(Mobilizon.Web.Plugs.DetectLocalePlug)

  if Application.compile_env(:mobilizon, :env) !== :dev do
@ -37,21 +52,6 @@ defmodule Mobilizon.Web.Endpoint do
    do: RemoteIp
  )

-  plug(Mobilizon.Web.Plugs.UploadedMedia)
-
-  # Serve at "/" the static files from "priv/static" directory.
-  #
-  # You should set gzip to true if you are running phoenix.digest
-  # when deploying your static files in production.
-  plug(
-    Plug.Static,
-    at: "/",
-    from: {:mobilizon, "priv/static"},
-    gzip: false,
-    only: Mobilizon.Web.static_paths(),
-    only_matching: ["precache-manifest"]
-  )
-
  # Code reloading can be explicitly enabled under the
  # :code_reloader configuration of your endpoint.
  if code_reloading? do
--- a/lib/web/router.ex
+++ b/lib/web/router.ex
@ -72,7 +72,6 @@ defmodule Mobilizon.Web.Router do

  pipeline :browser do
    plug(:put_request_context)
-    plug(Plug.Static, at: "/", from: "priv/static")

    plug(Mobilizon.Web.Plugs.SetLocalePlug)

@ -132,6 +131,7 @@ defmodule Mobilizon.Web.Router do
    get("/@:name/discussions", PageController, :discussions)
    get("/@:name/events", PageController, :events)
    get("/p/:slug", PageController, :post)
+    get("/conversations/:id", PageController, :conversation)
    get("/@:name/c/:slug", PageController, :discussion)
  end

@ -176,6 +176,7 @@ defmodule Mobilizon.Web.Router do

    forward("/", Absinthe.Plug.GraphiQL,
      schema: Mobilizon.GraphQL.Schema,
+      socket: Mobilizon.Web.GraphQLSocket,
      interface: :playground
    )
  end
--- a/lib/web/templates/email/activity/_conversation_activity_item.html.heex
+++ b/lib/web/templates/email/activity/_conversation_activity_item.html.heex
@ -0,0 +1,20 @@
+<%= case @activity.subject do %>
+  <% :conversation_created -> %>
+    <%= dgettext("activity", "%{profile} mentionned you in a %{conversation}.", %{
+      profile: "<b>#{escaped_display_name_and_username(@activity.author)}</b>",
+      conversation:
+        "<a href=\"#{Routes.page_url(Mobilizon.Web.Endpoint,
+        :conversation,
+        @activity.subject_params["conversation_participant_id"]) |> URI.decode()}\">conversation</a>"
+    })
+    |> raw %>
+  <% :conversation_replied -> %>
+    <%= dgettext("activity", "%{profile} replied you in a %{conversation}.", %{
+      profile: "<b>#{escaped_display_name_and_username(@activity.author)}</b>",
+      conversation:
+        "<a href=\"#{Routes.page_url(Mobilizon.Web.Endpoint,
+        :conversation,
+        @activity.subject_params["conversation_participant_id"]) |> URI.decode()}\">conversation</a>"
+    })
+    |> raw %>
+<% end %>
--- a/lib/web/templates/email/activity/_conversation_activity_item.text.eex
+++ b/lib/web/templates/email/activity/_conversation_activity_item.text.eex
@ -0,0 +1,11 @@
+<%= case @activity.subject do %><% :conversation_created -> %><%= dgettext("activity", "%{profile} mentionned you in a conversation.",
+    %{
+        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+    }
+) %>
+<%= Routes.page_url(Mobilizon.Web.Endpoint, :conversation, @activity.subject_params["conversation_participant_id"]) |> URI.decode() %><% :conversation_replied -> %><%= dgettext("activity", "%{profile} replied you in a conversation.",
+    %{
+        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+    }
+) %>
+<%= Routes.page_url(Mobilizon.Web.Endpoint, :conversation, @activity.subject_params["conversation_participant_id"]) |> URI.decode() %><% end %>
--- a/lib/web/templates/email/email_anonymous_activity.html.heex
+++ b/lib/web/templates/email/email_anonymous_activity.html.heex
@ -35,61 +35,164 @@
        <tr>
          <td align="center" valign="top" width="600">
    <![endif]-->
-    <table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
-      <!-- COPY -->
-      <tr>
-        <td bgcolor="#ffffff" align="left">
-          <table width="100%" border="0" cellspacing="0" cellpadding="0">
-            <tr>
-              <td
-                align="center"
-                style="border-radius: 3px; text-align: left; padding: 10px 5% 0px 30px; color: #474467; font-family: 'Roboto', Helvetica, Arial, sans-serif; font-size: 16px; font-weight: 400;line-height: 25px;"
-              >
-                <%= dgettext(
-                  "activity",
-                  "%{profile} has posted an announcement under event %{event}.",
-                  %{
-                    profile: "<b>#{escape_html(display_name_and_username(@activity.author))}</b>",
-                    event:
-                      "<a href=\"#{Routes.page_url(Mobilizon.Web.Endpoint,
-                      :event,
-                      @activity.subject_params["event_uuid"]) |> URI.decode()}\">
+    <%= case @activity.type do %>
+      <% :comment -> %>
+        <table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
+          <!-- COPY -->
+          <tr>
+            <td bgcolor="#ffffff" align="left">
+              <table width="100%" border="0" cellspacing="0" cellpadding="0">
+                <tr>
+                  <td
+                    align="center"
+                    style="border-radius: 3px; text-align: left; padding: 10px 5% 0px 30px; color: #474467; font-family: 'Roboto', Helvetica, Arial, sans-serif; font-size: 16px; font-weight: 400;line-height: 25px;"
+                  >
+                    <%= dgettext(
+                      "activity",
+                      "%{profile} has posted a public announcement under event %{event}.",
+                      %{
+                        profile:
+                          "<b>#{escape_html(display_name_and_username(@activity.author))}</b>",
+                        event:
+                          "<a href=\"#{Routes.page_url(Mobilizon.Web.Endpoint,
+                          :event,
+                          @activity.subject_params["event_uuid"]) |> URI.decode()}\">
                                #{escape_html(@activity.subject_params["event_title"])}
                            </a>"
-                  }
-                )
-                |> raw %>
-              </td>
-            </tr>
-          </table>
-        </td>
-      </tr>
-      <tr>
-        <td bgcolor="#ffffff" align="left">
-          <table width="100%" border="0" cellspacing="0" cellpadding="0">
-            <tr>
-              <td bgcolor="#ffffff" align="center" style="padding: 20px 30px 60px 30px;">
-                <table border="0" cellspacing="0" cellpadding="0">
-                  <tr>
-                    <td align="center" style="border-radius: 3px;" bgcolor="#3C376E">
-                      <a
-                        href={
+                      }
+                    )
+                    |> raw %>
+                  </td>
+                </tr>
+              </table>
+            </td>
+          </tr>
+          <tr>
+            <td bgcolor="#ffffff" align="left">
+              <table width="100%" border="0" cellspacing="0" cellpadding="0">
+                <tr>
+                  <td bgcolor="#ffffff" align="center" style="padding: 20px 30px 60px 30px;">
+                    <table border="0" cellspacing="0" cellpadding="0">
+                      <tr>
+                        <td align="center" style="border-radius: 3px;" bgcolor="#3C376E">
+                          <a
+                            href={
                          "#{Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"])}"
                        }
-                        target="_blank"
-                        style="font-size: 20px; font-family: Helvetica, Arial, sans-serif; color: #ffffff; text-decoration: none; padding: 15px 25px; border-radius: 2px; border: 1px solid #3C376E; display: inline-block;"
-                      >
-                        <%= gettext("Visit event page") %>
-                      </a>
-                    </td>
-                  </tr>
-                </table>
-              </td>
-            </tr>
-          </table>
-        </td>
-      </tr>
-    </table>
+                            target="_blank"
+                            style="font-size: 20px; font-family: Helvetica, Arial, sans-serif; color: #ffffff; text-decoration: none; padding: 15px 25px; border-radius: 2px; border: 1px solid #3C376E; display: inline-block;"
+                          >
+                            <%= gettext("Visit event page") %>
+                          </a>
+                        </td>
+                      </tr>
+                    </table>
+                  </td>
+                </tr>
+              </table>
+            </td>
+          </tr>
+        </table>
+      <% :conversation -> %>
+        <table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
+          <!-- COPY -->
+          <tr>
+            <td bgcolor="#ffffff" align="left">
+              <table width="100%" border="0" cellspacing="0" cellpadding="0">
+                <tr>
+                  <td
+                    align="center"
+                    style="border-radius: 3px; text-align: left; padding: 10px 5% 0px 30px; color: #474467; font-family: 'Roboto', Helvetica, Arial, sans-serif; font-size: 16px; font-weight: 400;line-height: 25px;"
+                  >
+                    <%= dgettext(
+                      "activity",
+                      "%{profile} has posted a private announcement about event %{event}.",
+                      %{
+                        profile:
+                          "<b>#{escape_html(display_name_and_username(@activity.author))}</b>",
+                        event:
+                          "<a href=\"#{Routes.page_url(Mobilizon.Web.Endpoint,
+                          :event,
+                          @activity.subject_params["conversation_event_uuid"]) |> URI.decode()}\">
+                                #{escape_html(@activity.subject_params["conversation_event_title"])}
+                            </a>"
+                      }
+                    )
+                    |> raw %>
+                    <%= dgettext(
+                      "activity",
+                      "It might give details on how to join the event, so make sure to read it appropriately."
+                    ) %>
+                  </td>
+                </tr>
+              </table>
+            </td>
+          </tr>
+          <tr>
+            <td bgcolor="#ffffff" align="left">
+              <table width="100%" border="0" cellspacing="0" cellpadding="0">
+                <tr>
+                  <td bgcolor="#ffffff" align="center" style="padding: 20px 30px 60px 30px;">
+                    <table border="0" cellspacing="0" cellpadding="0">
+                      <tr>
+                        <td align="center">
+                          <blockquote style="border-left-width: 0.25rem;border-left-color: #e2e8f0;border-left-style: solid;padding-left: 1em;margin: 0;text-align: start;color: #474467;font-family: 'Roboto', Helvetica, Arial, sans-serif; font-size: 16px; font-weight: 400;line-height: 25px;">
+                            <%= @extra["conversation"].last_comment.text
+                            |> sanitize_to_basic_html()
+                            |> raw() %>
+                          </blockquote>
+                        </td>
+                      </tr>
+                    </table>
+                  </td>
+                </tr>
+              </table>
+            </td>
+          </tr>
+          <tr>
+            <td bgcolor="#ffffff" align="left">
+              <table width="100%" border="0" cellspacing="0" cellpadding="0">
+                <tr>
+                  <td
+                    align="center"
+                    style="border-radius: 3px; text-align: left; padding: 10px 5% 0px 30px; color: #474467; font-family: 'Roboto', Helvetica, Arial, sans-serif; font-size: 16px; font-weight: 400;line-height: 25px;"
+                  >
+                    <%= dgettext(
+                      "activity",
+                      "This information is sent privately to you as a person who registered for this event. Share the informations above with other people with caution."
+                    ) %>
+                  </td>
+                </tr>
+              </table>
+            </td>
+          </tr>
+          <tr>
+            <td bgcolor="#ffffff" align="left">
+              <table width="100%" border="0" cellspacing="0" cellpadding="0">
+                <tr>
+                  <td bgcolor="#ffffff" align="center" style="padding: 20px 30px 60px 30px;">
+                    <table border="0" cellspacing="0" cellpadding="0">
+                      <tr>
+                        <td align="center" style="border-radius: 3px;" bgcolor="#3C376E">
+                          <a
+                            href={
+                          "#{Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["conversation_event_uuid"])}"
+                        }
+                            target="_blank"
+                            style="font-size: 20px; font-family: Helvetica, Arial, sans-serif; color: #ffffff; text-decoration: none; padding: 15px 25px; border-radius: 2px; border: 1px solid #3C376E; display: inline-block;"
+                          >
+                            <%= gettext("Visit event page") %>
+                          </a>
+                        </td>
+                      </tr>
+                    </table>
+                  </td>
+                </tr>
+              </table>
+            </td>
+          </tr>
+        </table>
+    <% end %>
    <!--[if (gte mso 9)|(IE)]>
    </td>
  </tr>
--- a/lib/web/templates/email/email_anonymous_activity.text.eex
+++ b/lib/web/templates/email/email_anonymous_activity.text.eex
@ -1,11 +1,30 @@
 <%= @subject %>

 ==
-
-<%= dgettext("activity", "%{profile} has posted an announcement under event %{event}.",
+<%= case @activity.type do %>
+<% :comment -> %>
+<%= dgettext("activity", "%{profile} has posted a public announcement under event %{event}.",
    %{
        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
        event: @activity.subject_params["event_title"]
    }
 ) %>
 <%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["event_uuid"]) |> URI.decode() %>
+<% :conversation -> %>
+<%= dgettext("activity", "%{profile} has posted a private announcement about event %{event}.",
+    %{
+        profile: Mobilizon.Actors.Actor.display_name_and_username(@activity.author),
+        event: @activity.subject_params["conversation_event_title"]
+    }
+) %>
+<%= dgettext("activity", "It might give details on how to join the event, so make sure to read it appropriately.") %>
+
+--
+
+<%= @extra["conversation"].last_comment.text |> html_to_text() |> mail_quote() %>
+
+--
+
+<%= dgettext("activity", "This information is sent privately to you as a person who registered for this event. Share the informations above with other people with caution.") %>
+<%= Routes.page_url(Mobilizon.Web.Endpoint, :event, @activity.subject_params["conversation_event_uuid"]) |> URI.decode() %>
+<% end %>
--- a/lib/web/templates/email/email_direct_activity.html.heex
+++ b/lib/web/templates/email/email_direct_activity.html.heex
@ -167,6 +167,10 @@
                                  <%= render("activity/_discussion_activity_item.html",
                                    activity: activity
                                  ) %>
+                                <% :conversation -> %>
+                                  <%= render("activity/_conversation_activity_item.html",
+                                    activity: activity
+                                  ) %>
                                <% :event -> %>
                                  <%= render("activity/_event_activity_item.html",
                                    activity: activity
--- a/lib/web/templates/email/email_direct_activity.text.eex
+++ b/lib/web/templates/email/email_direct_activity.text.eex
@ -15,7 +15,7 @@
 <% end %>

 <%= for activity <- Enum.take(group_activities, 5) do %>
-* <%= case activity.type do %><% :discussion -> %><%= render("activity/_discussion_activity_item.text", activity: activity) %><% :event -> %><%= render("activity/_event_activity_item.text", activity: activity) %><% :group -> %><%= render("activity/_group_activity_item.text", activity: activity) %>
+* <%= case activity.type do %><% :discussion -> %><%= render("activity/_discussion_activity_item.text", activity: activity) %><% :conversation -> %><%= render("activity/_conversation_activity_item.text", activity: activity) %><% :event -> %><%= render("activity/_event_activity_item.text", activity: activity) %><% :group -> %><%= render("activity/_group_activity_item.text", activity: activity) %>
 <% :member -> %><%= render("activity/_member_activity_item.text", activity: activity) %><% :post -> %><%= render("activity/_post_activity_item.text", activity: activity) %><% :resource -> %><%= render("activity/_resource_activity_item.text", activity: activity) %><% :comment -> %><%= render("activity/_comment_activity_item.text", activity: activity) %><% end %>
 <%= unless @single_activity do %><%= datetime_to_string(activity.inserted_at, @locale, :short) %><% end %>
 <% end %>
--- a/lib/web/views/email_view.ex
+++ b/lib/web/views/email_view.ex
@ -7,6 +7,7 @@ defmodule Mobilizon.Web.EmailView do
  alias Mobilizon.Actors.Actor
  alias Mobilizon.Service.Address
  alias Mobilizon.Service.DateTime, as: DateTimeRenderer
+  alias Mobilizon.Service.Formatter.{HTML, Text}
  alias Mobilizon.Web.Router.Helpers, as: Routes
  import Mobilizon.Web.Gettext
  import Mobilizon.Service.Metadata.Utils, only: [process_description: 1]
@ -35,6 +36,21 @@ defmodule Mobilizon.Web.EmailView do
    |> safe_to_string()
  end

+  @spec sanitize_to_basic_html(String.t()) :: String.t()
+  def sanitize_to_basic_html(html) do
+    case HTML.basic_html(html) do
+      {:ok, html} -> html
+      _ -> ""
+    end
+  end
+
+  defdelegate html_to_text(html), to: HTML
+
+  def mail_quote(text) do
+    # https://www.emailonacid.com/blog/article/email-development/line-length-in-html-email/
+    Text.quote_paragraph(text, 78)
+  end
+
  def escaped_display_name_and_username(actor) do
    actor
    |> display_name_and_username()
--- a/mix.exs
+++ b/mix.exs
@ -258,17 +258,19 @@ defmodule Mobilizon.Mixfile do
        "ecto.drop",
        "ecto.setup"
      ],
-      test: [
+      prepare_test: [
        "ecto.create",
        "ecto.migrate",
-        "tz_world.update",
+        "tz_world.update"
+      ],
+      test: [
        &run_test/1
      ],
      "phx.deps_migrate_serve": [
        "deps.get",
        "ecto.create --quiet",
        "ecto.migrate",
-        "cmd cd js && yarn install && cd ../",
+        "cmd npm ci",
        "phx.server"
      ]
    ]
--- a/package-lock.json
+++ b/package-lock.json
--- a/js/package.json
+++ b/js/package.json
@ -5,9 +5,9 @@
  "scripts": {
    "dev": "vite",
    "preview": "vite preview",
-    "build": "yarn run build:assets && yarn run build:pictures",
+    "build": "npm run build:assets && npm run build:pictures",
    "lint": "eslint --ext .ts,.vue --ignore-path .gitignore --fix src",
-    "format": "prettier .  --write",
+    "format": "prettier . --write",
    "build:assets": "vite build",
    "build:pictures": "bash ./scripts/build/pictures.sh",
    "story:dev": "histoire dev",
@ -15,7 +15,8 @@
    "story:preview": "histoire preview",
    "test": "vitest",
    "coverage": "vitest run --coverage",
-    "prepare": "cd ../ && husky install"
+    "prepare": "husky install",
+    "pre-commit": "lint-staged"
  },
  "lint-staged": {
    "**/*.{js,ts,vue}": [
@ -24,10 +25,10 @@
    ]
  },
  "dependencies": {
-    "@absinthe/socket": "^0.2.1",
-    "@absinthe/socket-apollo-link": "^0.2.1",
    "@apollo/client": "^3.3.16",
-    "@oruga-ui/oruga-next": "^0.6.0",
+    "@framasoft/socket": "^1.0.0",
+    "@framasoft/socket-apollo-link": "^1.0.0",
+    "@oruga-ui/oruga-next": "^0.7.0",
    "@sentry/tracing": "^7.1",
    "@sentry/vue": "^7.1",
    "@tiptap/core": "^2.0.0-beta.41",
@ -68,11 +69,11 @@
    "date-fns": "^2.16.0",
    "date-fns-tz": "^2.0.0",
    "floating-vue": "^2.0.0-beta.24",
-    "graphql": "^15.8.0",
+    "graphql": "^16.8.1",
    "graphql-tag": "^2.10.3",
    "hammerjs": "^2.0.8",
    "intersection-observer": "^0.12.0",
-    "jwt-decode": "^3.1.2",
+    "jwt-decode": "^4.0.0",
    "leaflet": "^1.4.0",
    "leaflet.locatecontrol": "^0.79",
    "leaflet.markercluster": "^1.5.3",
@ -114,7 +115,7 @@
    "@vitest/coverage-v8": "^0.34.1",
    "@vitest/ui": "^0.34.1",
    "@vue/eslint-config-prettier": "^8.0.0",
-    "@vue/eslint-config-typescript": "^11.0.0",
+    "@vue/eslint-config-typescript": "^12.0.0",
    "@vue/test-utils": "^2.0.2",
    "eslint": "^8.21.0",
    "eslint-config-prettier": "^9.0.0",
@ -125,16 +126,17 @@
    "histoire": "^0.17.0",
    "husky": "^8.0.3",
    "jsdom": "^22.0.0",
-    "lint-staged": "^14.0.1",
+    "lint-staged": "^15.1.0",
    "mock-apollo-client": "^1.1.0",
    "prettier": "^3.0.0",
-    "prettier-eslint": "^15.0.1",
+    "prettier-eslint": "^16.1.2",
    "rollup-plugin-visualizer": "^5.7.1",
    "sass": "^1.34.1",
-    "typescript": "~5.1.3",
+    "typescript": "~5.2.2",
    "vite": "^4.0.4",
    "vite-plugin-pwa": "^0.16.4",
    "vitest": "^0.34.1",
-    "vue-i18n-extract": "^2.0.4"
+    "vue-i18n-extract": "^2.0.4",
+    "vue-router-mock": "^1.0.0"
  }
 }
--- a/js/playwright.config.ts
+++ b/js/playwright.config.ts
--- a/js/postcss.config.js
+++ b/js/postcss.config.js
--- a/Show more
+++ b/Show more