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     |> fix_in_reply_to
  24     |> fix_emoji
  25   end
  26
  27   def fix_in_reply_to(%{"inReplyTo" => in_reply_to_id} = object) when not is_nil(in_reply_to_id) do
  28     case ActivityPub.fetch_object_from_id(in_reply_to_id) do
  29       {:ok, replied_object} ->
  30         activity = Activity.get_create_activity_by_object_ap_id(replied_object.data["id"])
  31         object
  32         |> Map.put("inReplyTo", replied_object.data["id"])
  33         |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
  34         |> Map.put("inReplyToStatusId", activity.id)
  35         |> Map.put("conversation", replied_object.data["context"] || object["conversation"])
  36         |> Map.put("context", replied_object.data["context"] || object["conversation"])
  37       e ->
  38         Logger.error("Couldn't fetch #{object["inReplyTo"]} #{inspect(e)}")
  39         object
  40     end
  41   end
  42   def fix_in_reply_to(object), do: object
  43
  44   def fix_context(object) do
  45     object
  46     |> Map.put("context", object["conversation"])
  47   end
  48
  49   def fix_attachments(object) do
  50     attachments = (object["attachment"] || [])
  51     |> Enum.map(fn (data) ->
  52       url = [%{"type" => "Link", "mediaType" => data["mediaType"], "href" => data["url"]}]
  53       Map.put(data, "url", url)
  54     end)
  55
  56     object
  57     |> Map.put("attachment", attachments)
  58   end
  59
  60   def fix_emoji(object) do
  61     tags = (object["tag"] || [])
  62     emoji = tags |> Enum.filter(fn (data) -> data["type"] == "Emoji" and data["icon"] end)
  63     emoji = emoji |> Enum.reduce(%{}, fn (data, mapping) ->
  64       name = data["name"]
  65       if String.starts_with?(name, ":") do
  66         name = name |> String.slice(1..-2)
  67       end
  68
  69       mapping |> Map.put(name, data["icon"]["url"])
  70     end)
  71
  72     # we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats
  73     emoji = Map.merge(object["emoji"] || %{}, emoji)
  74
  75     object
  76     |> Map.put("emoji", emoji)
  77   end
  78
  79   # TODO: validate those with a Ecto scheme
  80   # - tags
  81   # - emoji
  82   def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
  83     with nil <- Activity.get_create_activity_by_object_ap_id(object["id"]),
  84          %User{} = user <- User.get_or_fetch_by_ap_id(data["actor"]) do
  85       object = fix_object(data["object"])
  86
  87       params = %{
  88         to: data["to"],
  89         object: object,
  90         actor: user,
  91         context: object["conversation"],
  92         local: false,
  93         published: data["published"],
  94         additional: Map.take(data, [
  95               "cc",
  96               "id"
  97             ])
  98       }
  99
 100
 101       ActivityPub.create(params)
 102     else
 103       %Activity{} = activity -> {:ok, activity}
 104       _e -> :error
 105     end
 106   end
 107
 108   def handle_incoming(%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data) do
 109     with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
 110          %User{} = follower <- User.get_or_fetch_by_ap_id(follower),
 111          {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
 112       ActivityPub.accept(%{to: [follower.ap_id], actor: followed.ap_id, object: data, local: true})
 113       User.follow(follower, followed)
 114       {:ok, activity}
 115     else
 116       _e -> :error
 117     end
 118   end
 119
 120   def handle_incoming(%{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data) do
 121     with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 122          {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
 123          {:ok, activity, object} <- ActivityPub.like(actor, object, id, false) do
 124       {:ok, activity}
 125     else
 126       _e -> :error
 127     end
 128   end
 129
 130   def handle_incoming(%{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data) do
 131     with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 132          {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
 133          {:ok, activity, object} <- ActivityPub.announce(actor, object, id, false) do
 134       {:ok, activity}
 135     else
 136       _e -> :error
 137     end
 138   end
 139
 140   def handle_incoming(%{"type" => "Update", "object" => %{"type" => "Person"} = object, "actor" => actor_id} = data) do
 141     with %User{ap_id: ^actor_id} = actor <- User.get_by_ap_id(object["id"]) do
 142       {:ok, new_user_data} = ActivityPub.user_data_from_user_object(object)
 143
 144       banner = new_user_data[:info]["banner"]
 145       update_data = new_user_data
 146       |> Map.take([:name, :bio, :avatar])
 147       |> Map.put(:info, Map.merge(actor.info, %{"banner" => banner}))
 148
 149       actor
 150       |> User.upgrade_changeset(update_data)
 151       |> User.update_and_set_cache()
 152
 153       ActivityPub.update(%{local: false, to: data["to"] || [], cc: data["cc"] || [], object: object, actor: actor_id})
 154     else
 155       e ->
 156         Logger.error(e)
 157         :error
 158     end
 159   end
 160
 161   # TODO: Make secure.
 162   def handle_incoming(%{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => id} = data) do
 163     object_id = case object_id do
 164                   %{"id" => id} -> id
 165                   id -> id
 166                 end
 167     with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 168          {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
 169          {:ok, activity} <- ActivityPub.delete(object, false) do
 170       {:ok, activity}
 171     else
 172       e -> :error
 173     end
 174   end
 175
 176   # TODO
 177   # Accept
 178   # Undo
 179
 180   def handle_incoming(_), do: :error
 181
 182   def get_obj_helper(id) do
 183     if object = Object.get_by_ap_id(id), do: {:ok, object}, else: nil
 184   end
 185
 186   def prepare_object(object) do
 187     object
 188     |> set_sensitive
 189     |> add_hashtags
 190     |> add_mention_tags
 191     |> add_emoji_tags
 192     |> add_attributed_to
 193     |> prepare_attachments
 194     |> set_conversation
 195   end
 196
 197   @doc
 198   """
 199   internal -> Mastodon
 200   """
 201   def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
 202     object = object
 203     |> prepare_object
 204     data = data
 205     |> Map.put("object", object)
 206     |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 207
 208     {:ok, data}
 209   end
 210
 211   def prepare_outgoing(%{"type" => type} = data) do
 212     data = data
 213     |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 214
 215     {:ok, data}
 216   end
 217
 218   def add_hashtags(object) do
 219     tags = (object["tag"] || [])
 220     |> Enum.map fn (tag) -> %{"href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}", "name" => "##{tag}", "type" => "Hashtag"} end
 221
 222     object
 223     |> Map.put("tag", tags)
 224   end
 225
 226   def add_mention_tags(object) do
 227     recipients = object["to"] ++ (object["cc"] || [])
 228     mentions = recipients
 229     |> Enum.map(fn (ap_id) -> User.get_cached_by_ap_id(ap_id) end)
 230     |> Enum.filter(&(&1))
 231     |> Enum.map(fn(user) -> %{"type" => "Mention", "href" => user.ap_id, "name" => "@#{user.nickname}"} end)
 232
 233     tags = object["tag"] || []
 234
 235     object
 236     |> Map.put("tag", tags ++ mentions)
 237   end
 238
 239   # TODO: we should probably send mtime instead of unix epoch time for updated
 240   def add_emoji_tags(object) do
 241     tags = object["tag"] || []
 242     emoji = object["emoji"] || []
 243     out = emoji |> Enum.map(fn {name, url} ->
 244       %{"icon" => %{"url" => url, "type" => "Image"},
 245         "name" => ":" <> name <> ":",
 246         "type" => "Emoji",
 247         "updated" => "1970-01-01T00:00:00Z",
 248         "id" => url}
 249     end)
 250
 251     object
 252     |> Map.put("tag", tags ++ out)
 253   end
 254
 255   def set_conversation(object) do
 256     Map.put(object, "conversation", object["context"])
 257   end
 258
 259   def set_sensitive(object) do
 260     tags = object["tag"] || []
 261     Map.put(object, "sensitive", "nsfw" in tags)
 262   end
 263
 264   def add_attributed_to(object) do
 265     attributedTo = object["attributedTo"] || object["actor"]
 266
 267     object
 268     |> Map.put("attributedTo", attributedTo)
 269   end
 270
 271   def prepare_attachments(object) do
 272     attachments = (object["attachment"] || [])
 273     |> Enum.map(fn (data) ->
 274       [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
 275       %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
 276     end)
 277
 278     object
 279     |> Map.put("attachment", attachments)
 280   end
 281
 282   defp user_upgrade_task(user) do
 283     old_follower_address = User.ap_followers(user)
 284     q  = from u in User,
 285     where: ^old_follower_address in u.following,
 286     update: [set: [following: fragment("array_replace(?,?,?)", u.following, ^old_follower_address, ^user.follower_address)]]
 287     Repo.update_all(q, [])
 288
 289     maybe_retire_websub(user.ap_id)
 290
 291     # Only do this for recent activties, don't go through the whole db.
 292     # Only look at the last 1000 activities.
 293     since = (Repo.aggregate(Activity, :max, :id) || 0) - 1_000
 294     q  = from a in Activity,
 295     where: ^old_follower_address in a.recipients,
 296     where: a.id > ^since,
 297     update: [set: [recipients: fragment("array_replace(?,?,?)", a.recipients, ^old_follower_address, ^user.follower_address)]]
 298     Repo.update_all(q, [])
 299   end
 300
 301   def upgrade_user_from_ap_id(ap_id, async \\ true) do
 302     with %User{local: false} = user <- User.get_by_ap_id(ap_id),
 303          {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id) do
 304       data = data
 305       |> Map.put(:info, Map.merge(user.info, data[:info]))
 306
 307       already_ap = User.ap_enabled?(user)
 308       {:ok, user} = User.upgrade_changeset(user, data)
 309       |> Repo.update()
 310
 311       if !already_ap do
 312         # This could potentially take a long time, do it in the background
 313         if async do
 314           Task.start(fn ->
 315             user_upgrade_task(user)
 316           end)
 317         else
 318           user_upgrade_task(user)
 319         end
 320       end
 321
 322       {:ok, user}
 323     else
 324       e -> e
 325     end
 326   end
 327
 328   def maybe_retire_websub(ap_id) do
 329     # some sanity checks
 330     if is_binary(ap_id) && (String.length(ap_id) > 8) do
 331       q = from ws in Pleroma.Web.Websub.WebsubClientSubscription,
 332         where: fragment("? like ?", ws.topic, ^"#{ap_id}%")
 333       Repo.delete_all(q)
 334     end
 335   end
 336 end