forked from potsda.mn/mobilizon
106 lines
3.5 KiB
Elixir
106 lines
3.5 KiB
Elixir
defmodule Mobilizon.Federation.ActivityPub.Fetcher do
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@moduledoc """
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Module to handle direct URL ActivityPub fetches to remote content
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If you need to first get cached data, see `Mobilizon.Federation.ActivityPub.fetch_object_from_url/2`
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"""
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require Logger
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alias Mobilizon.Federation.HTTPSignatures.Signature
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alias Mobilizon.Federation.ActivityPub.{Relay, Transmogrifier}
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alias Mobilizon.Service.HTTP.ActivityPub, as: ActivityPubClient
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import Mobilizon.Federation.ActivityPub.Utils,
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only: [maybe_date_fetch: 2, sign_fetch: 4, origin_check?: 2]
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@spec fetch(String.t(), Keyword.t()) :: {:ok, map()}
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def fetch(url, options \\ []) do
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on_behalf_of = Keyword.get(options, :on_behalf_of, Relay.get_actor())
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with false <- address_invalid(url),
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date <- Signature.generate_date_header(),
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headers <-
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[{:Accept, "application/activity+json"}]
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|> maybe_date_fetch(date)
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|> sign_fetch(on_behalf_of, url, date),
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client <-
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ActivityPubClient.client(headers: headers),
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{:ok, %Tesla.Env{body: data, status: code}} when code in 200..299 <-
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ActivityPubClient.get(client, url) do
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{:ok, data}
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else
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{:ok, %Tesla.Env{status: 410}} ->
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Logger.warn("Resource at #{url} is 410 Gone")
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{:error, "Gone"}
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{:ok, %Tesla.Env{status: 404}} ->
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Logger.warn("Resource at #{url} is 404 Gone")
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{:error, "Not found"}
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{:ok, %Tesla.Env{} = res} ->
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{:error, res}
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{:error, err} ->
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{:error, err}
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end
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end
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@spec fetch_and_create(String.t(), Keyword.t()) :: {:ok, map(), struct()}
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def fetch_and_create(url, options \\ []) do
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with {:ok, data} when is_map(data) <- fetch(url, options),
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{:origin_check, true} <- {:origin_check, origin_check?(url, data)},
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params <- %{
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"type" => "Create",
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"to" => data["to"],
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"cc" => data["cc"],
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"actor" => data["actor"] || data["attributedTo"],
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"attributedTo" => data["attributedTo"] || data["actor"],
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"object" => data
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} do
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Transmogrifier.handle_incoming(params)
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else
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{:origin_check, false} ->
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Logger.warn("Object origin check failed")
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{:error, "Object origin check failed"}
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# Returned content is not JSON
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{:ok, data} when is_binary(data) ->
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{:error, "Failed to parse content as JSON"}
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{:error, err} ->
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{:error, err}
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end
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end
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@spec fetch_and_update(String.t(), Keyword.t()) :: {:ok, map(), struct()}
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def fetch_and_update(url, options \\ []) do
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with {:ok, data} when is_map(data) <- fetch(url, options),
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{:origin_check, true} <- {:origin_check, origin_check?(url, data)},
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params <- %{
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"type" => "Update",
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"to" => data["to"],
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"cc" => data["cc"],
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"actor" => data["actor"] || data["attributedTo"],
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"attributedTo" => data["attributedTo"] || data["actor"],
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"object" => data
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} do
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Transmogrifier.handle_incoming(params)
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else
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{:origin_check, false} ->
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Logger.warn("Object origin check failed")
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{:error, "Object origin check failed"}
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{:error, err} ->
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{:error, err}
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end
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end
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@spec address_invalid(String.t()) :: false | {:error, :invalid_url}
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defp address_invalid(address) do
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with %URI{host: host, scheme: scheme} <- URI.parse(address),
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true <- is_nil(host) or is_nil(scheme) do
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{:error, :invalid_url}
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end
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end
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end
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