From 4dc4524e713cad83dcea21a46c97066c437732c2 Mon Sep 17 00:00:00 2001
From: Thomas Citharel <tcit@tcit.fr>
Date: Mon, 18 Nov 2019 17:54:42 +0100
Subject: [PATCH] Validate username on backend side and refactor actor
 changeset

Closes #316

Signed-off-by: Thomas Citharel <tcit@tcit.fr>
---
 lib/mobilizon/actors/actor.ex | 38 +++++++++++++----------------------
 1 file changed, 14 insertions(+), 24 deletions(-)

diff --git a/lib/mobilizon/actors/actor.ex b/lib/mobilizon/actors/actor.ex
index 29107caf8..f5623b414 100644
--- a/lib/mobilizon/actors/actor.ex
+++ b/lib/mobilizon/actors/actor.ex
@@ -203,14 +203,9 @@ defmodule Mobilizon.Actors.Actor do
     actor
     |> cast(attrs, @attrs)
     |> build_urls()
-    |> cast_embed(:avatar)
-    |> cast_embed(:banner)
+    |> common_changeset()
     |> unique_username_validator()
     |> validate_required(@required_attrs)
-    |> unique_constraint(:preferred_username,
-      name: :actors_preferred_username_domain_type_index
-    )
-    |> unique_constraint(:url, name: :actors_url_index)
   end
 
   @doc false
@@ -218,13 +213,8 @@ defmodule Mobilizon.Actors.Actor do
   def update_changeset(%__MODULE__{} = actor, attrs) do
     actor
     |> cast(attrs, @update_attrs)
-    |> cast_embed(:avatar)
-    |> cast_embed(:banner)
+    |> common_changeset()
     |> validate_required(@update_required_attrs)
-    |> unique_constraint(:preferred_username,
-      name: :actors_preferred_username_domain_type_index
-    )
-    |> unique_constraint(:url, name: :actors_url_index)
   end
 
   @doc """
@@ -235,13 +225,8 @@ defmodule Mobilizon.Actors.Actor do
     actor
     |> cast(attrs, @registration_attrs)
     |> build_urls()
-    |> cast_embed(:avatar)
-    |> cast_embed(:banner)
+    |> common_changeset()
     |> unique_username_validator()
-    |> unique_constraint(:preferred_username,
-      name: :actors_preferred_username_domain_type_index
-    )
-    |> unique_constraint(:url, name: :actors_url_index)
     |> validate_required(@registration_required_attrs)
   end
 
@@ -254,13 +239,8 @@ defmodule Mobilizon.Actors.Actor do
       %__MODULE__{}
       |> cast(attrs, @remote_actor_creation_attrs)
       |> validate_required(@remote_actor_creation_required_attrs)
-      |> cast_embed(:avatar)
-      |> cast_embed(:banner)
+      |> common_changeset()
       |> unique_username_validator()
-      |> unique_constraint(:preferred_username,
-        name: :actors_preferred_username_domain_type_index
-      )
-      |> unique_constraint(:url, name: :actors_url_index)
       |> validate_length(:summary, max: 5000)
       |> validate_length(:preferred_username, max: 100)
 
@@ -269,6 +249,16 @@ defmodule Mobilizon.Actors.Actor do
     changeset
   end
 
+  @spec common_changeset(Ecto.Changeset.t()) :: Ecto.Changeset.t()
+  defp common_changeset(%Ecto.Changeset{} = changeset) do
+    changeset
+    |> cast_embed(:avatar)
+    |> cast_embed(:banner)
+    |> unique_constraint(:url, name: :actors_url_index)
+    |> unique_constraint(:preferred_username, name: :actors_preferred_username_domain_type_index)
+    |> validate_format(:preferred_username, ~r/[a-z0-9_]+/)
+  end
+
   @doc """
   Changeset for relay creation.
   """