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   end
  25
  26   def fix_in_reply_to(%{"inReplyTo" => in_reply_to_id} = object) when not is_nil(in_reply_to_id) do
  27     case ActivityPub.fetch_object_from_id(object["inReplyToAtomUri"] || in_reply_to_id) do
  28       {:ok, replied_object} ->
  29         activity = Activity.get_create_activity_by_object_ap_id(replied_object.data["id"])
  30         object
  31         |> Map.put("inReplyTo", replied_object.data["id"])
  32         |> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
  33         |> Map.put("inReplyToStatusId", activity.id)
  34       e ->
  35         Logger.error("Couldn't fetch #{object["inReplyTo"]} #{inspect(e)}")
  36         object
  37     end
  38   end
  39   def fix_in_reply_to(object), do: object
  40
  41   def fix_context(object) do
  42     object
  43     |> Map.put("context", object["conversation"])
  44   end
  45
  46   def fix_attachments(object) do
  47     attachments = (object["attachment"] || [])
  48     |> Enum.map(fn (data) ->
  49       url = [%{"type" => "Link", "mediaType" => data["mediaType"], "href" => data["url"]}]
  50       Map.put(data, "url", url)
  51     end)
  52
  53     object
  54     |> Map.put("attachment", attachments)
  55   end
  56
  57   # TODO: validate those with a Ecto scheme
  58   # - tags
  59   # - emoji
  60   def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
  61     with nil <- Activity.get_create_activity_by_object_ap_id(object["id"]),
  62          %User{} = user <- User.get_or_fetch_by_ap_id(data["actor"]) do
  63       object = fix_object(data["object"])
  64
  65       params = %{
  66         to: data["to"],
  67         object: object,
  68         actor: user,
  69         context: data["object"]["conversation"],
  70         local: false,
  71         published: data["published"],
  72         additional: Map.take(data, [
  73               "cc",
  74               "id"
  75             ])
  76       }
  77
  78
  79       ActivityPub.create(params)
  80     else
  81       %Activity{} = activity -> {:ok, activity}
  82       _e -> :error
  83     end
  84   end
  85
  86   def handle_incoming(%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data) do
  87     with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
  88          %User{} = follower <- User.get_or_fetch_by_ap_id(follower),
  89          {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
  90       ActivityPub.accept(%{to: [follower.ap_id], actor: followed.ap_id, object: data, local: true})
  91       User.follow(follower, followed)
  92       {:ok, activity}
  93     else
  94       _e -> :error
  95     end
  96   end
  97
  98   def handle_incoming(%{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data) do
  99     with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 100          {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
 101          {:ok, activity, object} <- ActivityPub.like(actor, object, id, false) do
 102       {:ok, activity}
 103     else
 104       _e -> :error
 105     end
 106   end
 107
 108   def handle_incoming(%{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data) do
 109     with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
 110          {:ok, object} <- get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
 111          {:ok, activity, object} <- ActivityPub.announce(actor, object, id, false) do
 112       {:ok, activity}
 113     else
 114       _e -> :error
 115     end
 116   end
 117
 118   # TODO
 119   # Accept
 120   # Undo
 121
 122   def handle_incoming(_), do: :error
 123
 124   def get_obj_helper(id) do
 125     if object = Object.get_by_ap_id(id), do: {:ok, object}, else: nil
 126   end
 127
 128   def prepare_object(object) do
 129     object
 130     |> set_sensitive
 131     |> add_hashtags
 132     |> add_mention_tags
 133     |> add_attributed_to
 134     |> prepare_attachments
 135     |> set_conversation
 136   end
 137
 138   @doc
 139   """
 140   internal -> Mastodon
 141   """
 142   def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
 143     object = object
 144     |> prepare_object
 145     data = data
 146     |> Map.put("object", object)
 147     |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 148
 149     {:ok, data}
 150   end
 151
 152   def prepare_outgoing(%{"type" => type} = data) do
 153     data = data
 154     |> Map.put("@context", "https://www.w3.org/ns/activitystreams")
 155
 156     {:ok, data}
 157   end
 158
 159   def add_hashtags(object) do
 160     tags = (object["tag"] || [])
 161     |> Enum.map fn (tag) -> %{"href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}", "name" => "##{tag}", "type" => "Hashtag"} end
 162
 163     object
 164     |> Map.put("tag", tags)
 165   end
 166
 167   def add_mention_tags(object) do
 168     recipients = object["to"] ++ (object["cc"] || [])
 169     mentions = recipients
 170     |> Enum.map(fn (ap_id) -> User.get_cached_by_ap_id(ap_id) end)
 171     |> Enum.filter(&(&1))
 172     |> Enum.map(fn(user) -> %{"type" => "Mention", "href" => user.ap_id, "name" => "@#{user.nickname}"} end)
 173
 174     tags = object["tag"] || []
 175
 176     object
 177     |> Map.put("tag", tags ++ mentions)
 178   end
 179
 180   def set_conversation(object) do
 181     Map.put(object, "conversation", object["context"])
 182   end
 183
 184   def set_sensitive(object) do
 185     tags = object["tag"] || []
 186     Map.put(object, "sensitive", "nsfw" in tags)
 187   end
 188
 189   def add_attributed_to(object) do
 190     attributedTo = object["attributedTo"] || object["actor"]
 191
 192     object
 193     |> Map.put("attributedTo", attributedTo)
 194   end
 195
 196   def prepare_attachments(object) do
 197     attachments = (object["attachment"] || [])
 198     |> Enum.map(fn (data) ->
 199       [%{"mediaType" => media_type, "href" => href} | _] = data["url"]
 200       %{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
 201     end)
 202
 203     object
 204     |> Map.put("attachment", attachments)
 205   end
 206
 207   defp user_upgrade_task(user) do
 208     old_follower_address = User.ap_followers(user)
 209     q  = from u in User,
 210     where: ^old_follower_address in u.following,
 211     update: [set: [following: fragment("array_replace(?,?,?)", u.following, ^old_follower_address, ^user.follower_address)]]
 212     Repo.update_all(q, [])
 213
 214     maybe_retire_websub(user.ap_id)
 215
 216     # Only do this for recent activties, don't go through the whole db.
 217     since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
 218     q  = from a in Activity,
 219     where: ^old_follower_address in a.recipients,
 220     where: a.id > ^since,
 221     update: [set: [recipients: fragment("array_replace(?,?,?)", a.recipients, ^old_follower_address, ^user.follower_address)]]
 222     Repo.update_all(q, [])
 223   end
 224
 225   def upgrade_user_from_ap_id(ap_id, async \\ true) do
 226     with %User{local: false} = user <- User.get_by_ap_id(ap_id),
 227          {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id) do
 228       data = data
 229       |> Map.put(:info, Map.merge(user.info, data[:info]))
 230
 231       {:ok, user} = User.upgrade_changeset(user, data)
 232       |> Repo.update()
 233
 234       # This could potentially take a long time, do it in the background
 235       if async do
 236         Task.start(fn ->
 237           user_upgrade_task(user)
 238         end)
 239       else
 240         user_upgrade_task(user)
 241       end
 242
 243       {:ok, user}
 244     else
 245       e -> e
 246     end
 247   end
 248
 249   def maybe_retire_websub(ap_id) do
 250     # some sanity checks
 251     if is_binary(ap_id) && (String.length(ap_id) > 8) do
 252       q = from ws in Pleroma.Web.Websub.WebsubClientSubscription,
 253         where: fragment("? like ?", ws.topic, ^"#{ap_id}%")
 254       Repo.delete_all(q)
 255     end
 256   end
 257 end