git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/transmogrifier.ex

   1 defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   2   @moduledoc """
   3   A module to handle coding from internal to wire ActivityPub and back.
   4   """
   5   alias Pleroma.User
   6   alias Pleroma.Object
   7   alias Pleroma.Activity
   8   alias Pleroma.Repo
   9   alias Pleroma.Web.ActivityPub.ActivityPub
  10
  11   import Ecto.Query
  12
  13   require Logger
  14
  15   @doc """
  16   Modifies an incoming AP object (mastodon format) to our internal format.
  17   """
  18   def fix_object(object) do
  19     object
  20     |> Map.put("actor", object["attributedTo"])
  21     |> fix_attachments
  22     |> fix_context
  23   end
  24
  25   def fix_context(object) do
  26     object
  27     |> Map.put("context", object["conversation"])
  28   end
  29
  30   def fix_attachments(object) do
  31     attachments = (object["attachment"] || [])
  32     |> Enum.map(fn (data) ->
  33       url = [%{"type" => "Link", "mediaType" => data["mediaType"], "href" => data["url"]}]
  34       Map.put(data, "url", url)
  35     end)
  36
  37     object
  38     |> Map.put("attachment", attachments)
  39   end
  40
  41   # TODO: validate those with a Ecto scheme
  42   # - tags
  43   # - emoji
  44   def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
  45     with nil <- Activity.get_create_activity_by_object_ap_id(object["id"]),
  46          %User{} = user <- User.get_or_fetch_by_ap_id(data["actor"]) do
  47       object = fix_object(data["object"])
  48
  49       replied_to_id = if object["inReplyTo"] do
  50         case ActivityPub.fetch_object_from_id(object["inReplyTo"]) do
  51           {:ok, object} -> object.data["id"]
  52           e ->
  53             Logger.error("Couldn't fetch #{object["inReplyTo"]} #{inspect(e)}")
  54             nil
  55         end
  56       else
  57         nil
  58       end
  59
  60       object = Map.put(object, "inReplyTo", replied_to_id || object["inReplyTo"])
  61
  62       params = %{
  63         to: data["to"],
  64         object: object,
  65         actor: user,
  66         context: data["object"]["conversation"],
  67         local: false,
  68         published: data["published"],
  69         additional: Map.take(data, [
  70               "cc",
  71               "id"
  72             ])
  73       }
  74
  75
  76       ActivityPub.create(params)
  77     else
  78       %Activity{} = activity -> {:ok, activity}
  79       _e -> :error
  80     end
  81   end
  82
  83   def handle_incoming(%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data) do
  84     with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
  85          %User{} = follower <- User.get_or_fetch_by_ap_id(follower),
  86          {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
  87       ActivityPub.accept(%{to: [follower.ap_id], actor: followed.ap_id, object: data, local: true})
  88       User.follow(follower, followed)
  89       {:ok, activity}
  90     else
  91       _e -> :error
  92     end
  93   end
  94
  95   def handle_incoming(%{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data) do
  96     with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
  97          {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
  98          {:ok, activity, object} <- ActivityPub.like(actor, object, id, false) do
  99       {:ok, activity}
 100     else
 101       _e -> :error
 102     end
 103   end
 104
 105   def handle_incoming(%{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data) do
 106     with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 107          {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
 108          {:ok, activity, object} <- ActivityPub.announce(actor, object, id, false) do
 109       {:ok, activity}
 110     else
 111       _e -> :error
 112     end
 113   end
 114
 115   # TODO
 116   # Accept
 117   # Undo
 118
 119   def handle_incoming(_), do: :error
 120
 121   def get_obj_helper(id) do
 122     if object = Object.get_by_ap_id(id), do: {:ok, object}, else: nil
 123   end
 124
 125   @doc
 126   """
 127   internal -> Mastodon
 128   """
 129   def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
 130     object = object
 131     |> set_sensitive
 132     |> add_hashtags
 133     |> add_mention_tags
 134     |> add_attributed_to
 135     |> prepare_attachments
 136     |> set_conversation
 137
 138     data = data
 139     |> Map.put("object", object)
 140     |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 141
 142     {:ok, data}
 143   end
 144
 145   def prepare_outgoing(%{"type" => type} = data) do
 146     data = data
 147     |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 148
 149     {:ok, data}
 150   end
 151
 152   def add_hashtags(object) do
 153     tags = (object["tag"] || [])
 154     |> Enum.map fn (tag) -> %{"href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}", "name" => "##{tag}", "type" => "Hashtag"} end
 155
 156     object
 157     |> Map.put("tag", tags)
 158   end
 159
 160   def add_mention_tags(object) do
 161     recipients = object["to"] ++ (object["cc"] || [])
 162     mentions = recipients
 163     |> Enum.map(fn (ap_id) -> User.get_cached_by_ap_id(ap_id) end)
 164     |> Enum.filter(&(&1))
 165     |> Enum.map(fn(user) -> %{"type" => "Mention", "href" => user.ap_id, "name" => "@#{user.nickname}"} end)
 166
 167     tags = object["tag"] || []
 168
 169     object
 170     |> Map.put("tag", tags ++ mentions)
 171   end
 172
 173   def set_conversation(object) do
 174     Map.put(object, "conversation", object["context"])
 175   end
 176
 177   def set_sensitive(object) do
 178     tags = object["tag"] || []
 179     Map.put(object, "sensitive", "nsfw" in tags)
 180   end
 181
 182   def add_attributed_to(object) do
 183     attributedTo = object["attributedTo"] || object["actor"]
 184
 185     object
 186     |> Map.put("attributedTo", attributedTo)
 187   end
 188
 189   def prepare_attachments(object) do
 190     attachments = (object["attachment"] || [])
 191     |> Enum.map(fn (data) ->
 192       [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
 193       %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
 194     end)
 195
 196     object
 197     |> Map.put("attachment", attachments)
 198   end
 199
 200   defp user_upgrade_task(user) do
 201     old_follower_address = User.ap_followers(user)
 202     q  = from u in User,
 203     where: ^old_follower_address in u.following,
 204     update: [set: [following: fragment("array_replace(?,?,?)", u.following, ^old_follower_address, ^user.follower_address)]]
 205     Repo.update_all(q, [])
 206
 207     # Only do this for recent activties, don't go through the whole db.
 208     since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
 209     q  = from a in Activity,
 210     where: ^old_follower_address in a.recipients,
 211     where: a.id > ^since,
 212     update: [set: [recipients: fragment("array_replace(?,?,?)", a.recipients, ^old_follower_address, ^user.follower_address)]]
 213     Repo.update_all(q, [])
 214   end
 215
 216   def upgrade_user_from_ap_id(ap_id, async \\ true) do
 217     with %User{} = user <- User.get_by_ap_id(ap_id),
 218          {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id) do
 219       data = data
 220       |> Map.put(:info, Map.merge(user.info, data[:info]))
 221
 222       {:ok, user} = User.upgrade_changeset(user, data)
 223       |> Repo.update()
 224
 225       # This could potentially take a long time, do it in the background
 226       if async do
 227         Task.start(fn ->
 228           user_upgrade_task(user)
 229         end)
 230       else
 231         user_upgrade_task(user)
 232       end
 233
 234       {:ok, user}
 235     else
 236       e -> e
 237     end
 238   end
 239 end