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

   1 defmodule Pleroma.Web.OStatus do
   2   @httpoison Application.get_env(:pleroma, :httpoison)
   3
   4   import Ecto.Query
   5   import Pleroma.Web.XML
   6   require Logger
   7
   8   alias Pleroma.{Repo, User, Web, Object}
   9   alias Pleroma.Web.ActivityPub.ActivityPub
  10   alias Pleroma.Web.{WebFinger, Websub}
  11
  12   def feed_path(user) do
  13     "#{user.ap_id}/feed.atom"
  14   end
  15
  16   def pubsub_path(user) do
  17     "#{Web.base_url}/push/hub/#{user.nickname}"
  18   end
  19
  20   def salmon_path(user) do
  21     "#{user.ap_id}/salmon"
  22   end
  23
  24   def handle_incoming(xml_string) do
  25     doc = parse_document(xml_string)
  26     entries = :xmerl_xpath.string('//entry', doc)
  27
  28     activities = Enum.map(entries, fn (entry) ->
  29       {:xmlObj, :string, object_type} = :xmerl_xpath.string('string(/entry/activity:object-type[1])', entry)
  30       {:xmlObj, :string, verb} = :xmerl_xpath.string('string(/entry/activity:verb[1])', entry)
  31
  32       case verb do
  33         'http://activitystrea.ms/schema/1.0/share' ->
  34           with {:ok, activity, retweeted_activity} <- handle_share(entry, doc), do: [activity, retweeted_activity]
  35         'http://activitystrea.ms/schema/1.0/favorite' ->
  36           with {:ok, activity, favorited_activity} <- handle_favorite(entry, doc), do: [activity, favorited_activity]
  37         _ ->
  38           case object_type do
  39             'http://activitystrea.ms/schema/1.0/note' ->
  40               with {:ok, activity} <- handle_note(entry, doc), do: activity
  41             'http://activitystrea.ms/schema/1.0/comment' ->
  42               with {:ok, activity} <- handle_note(entry, doc), do: activity
  43             _ ->
  44               Logger.error("Couldn't parse incoming document")
  45               nil
  46           end
  47       end
  48     end)
  49     {:ok, activities}
  50   end
  51
  52   def make_share(_entry, doc, retweeted_activity) do
  53     with {:ok, actor} <- find_make_or_update_user(doc),
  54          %Object{} = object <- Object.get_cached_by_ap_id(retweeted_activity.data["object"]["id"]),
  55          {:ok, activity, _object} = ActivityPub.announce(actor, object, false) do
  56       {:ok, activity}
  57     end
  58   end
  59
  60   def handle_share(entry, doc) do
  61     with [object] <- :xmerl_xpath.string('/entry/activity:object', entry),
  62          {:ok, retweeted_activity} <-  handle_note(object, object),
  63          {:ok, activity} <- make_share(entry, doc, retweeted_activity) do
  64       {:ok, activity, retweeted_activity}
  65     else
  66       e -> {:error, e}
  67     end
  68   end
  69
  70   def make_favorite(_entry, doc, favorited_activity) do
  71     with {:ok, actor} <- find_make_or_update_user(doc),
  72          %Object{} = object <- Object.get_cached_by_ap_id(favorited_activity.data["object"]["id"]),
  73          {:ok, activity, _object} = ActivityPub.like(actor, object, false) do
  74       {:ok, activity}
  75     end
  76   end
  77
  78   def handle_favorite(entry, doc) do
  79     with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry),
  80          {:ok, [favorited_activity]} <- fetch_activity_from_html_url(href),
  81          {:ok, activity} <- make_favorite(entry, doc, favorited_activity) do
  82       {:ok, activity, favorited_activity}
  83     else
  84       e -> {:error, e}
  85     end
  86   end
  87
  88   def get_attachments(entry) do
  89     :xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry)
  90     |> Enum.map(fn (enclosure) ->
  91       with href when not is_nil(href) <- string_from_xpath("/link/@href", enclosure),
  92            type when not is_nil(type) <- string_from_xpath("/link/@type", enclosure) do
  93         %{
  94           "type" => "Attachment",
  95           "url" => [%{
  96                        "type" => "Link",
  97                        "mediaType" => type,
  98                        "href" => href
  99                     }]
 100         }
 101       end
 102     end)
 103     |> Enum.filter(&(&1))
 104   end
 105
 106   def handle_note(entry, doc \\ nil) do
 107     content_html = string_from_xpath("//content[1]", entry)
 108
 109     [author] = :xmerl_xpath.string('//author[1]', doc)
 110     {:ok, actor} = find_make_or_update_user(author)
 111     inReplyTo = string_from_xpath("//thr:in-reply-to[1]/@ref", entry)
 112
 113     context = (string_from_xpath("//ostatus:conversation[1]", entry) || "") |> String.trim
 114
 115     attachments = get_attachments(entry)
 116
 117     context = with %{data: %{"context" => context}} <- Object.get_cached_by_ap_id(inReplyTo) do
 118                 context
 119               else _e ->
 120                 if String.length(context) > 0 do
 121                   context
 122                 else
 123                   ActivityPub.generate_context_id
 124                 end
 125               end
 126
 127     to = [
 128       "https://www.w3.org/ns/activitystreams#Public"
 129     ]
 130
 131     mentions = :xmerl_xpath.string('//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/person"]', entry)
 132     |> Enum.map(fn(person) -> string_from_xpath("@href", person) end)
 133
 134     to = to ++ mentions
 135
 136     date = string_from_xpath("//published", entry)
 137     id = string_from_xpath("//id", entry)
 138
 139     object = %{
 140       "id" => id,
 141       "type" => "Note",
 142       "to" => to,
 143       "content" => content_html,
 144       "published" => date,
 145       "context" => context,
 146       "actor" => actor.ap_id,
 147       "attachment" => attachments
 148     }
 149
 150     object = if inReplyTo do
 151       Map.put(object, "inReplyTo", inReplyTo)
 152     else
 153       object
 154     end
 155
 156     # TODO: Bail out sooner and use transaction.
 157     if Object.get_by_ap_id(id) do
 158       {:error, "duplicate activity"}
 159     else
 160       ActivityPub.create(to, actor, context, object, %{}, date, false)
 161     end
 162   end
 163
 164   def find_make_or_update_user(doc) do
 165     uri = string_from_xpath("//author/uri[1]", doc)
 166     with {:ok, user} <- find_or_make_user(uri) do
 167       avatar = make_avatar_object(doc)
 168       if user.avatar != avatar do
 169         change = Ecto.Changeset.change(user, %{avatar: avatar})
 170         Repo.update(change)
 171       else
 172         {:ok, user}
 173       end
 174     end
 175   end
 176
 177   def find_or_make_user(uri) do
 178     query = from user in User,
 179       where: user.local == false and fragment("? @> ?", user.info, ^%{uri: uri})
 180
 181     user = Repo.one(query)
 182
 183     if is_nil(user) do
 184       make_user(uri)
 185     else
 186       {:ok, user}
 187     end
 188   end
 189
 190   def make_user(uri) do
 191     with {:ok, info} <- gather_user_info(uri) do
 192       data = %{
 193         local: false,
 194         name: info["name"],
 195         nickname: info["nickname"] <> "@" <> info["host"],
 196         ap_id: info["uri"],
 197         info: info,
 198         avatar: info["avatar"]
 199       }
 200       # TODO: Make remote user changeset
 201       # SHould enforce fqn nickname
 202       Repo.insert(Ecto.Changeset.change(%User{}, data))
 203     end
 204   end
 205
 206   # TODO: Just takes the first one for now.
 207   def make_avatar_object(author_doc) do
 208     href = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@href", author_doc)
 209     type = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@type", author_doc)
 210
 211     if href do
 212       %{
 213         "type" => "Image",
 214         "url" =>
 215           [%{
 216               "type" => "Link",
 217               "mediaType" => type,
 218               "href" => href
 219            }]
 220       }
 221     else
 222       nil
 223     end
 224   end
 225
 226   def gather_user_info(username) do
 227     with {:ok, webfinger_data} <- WebFinger.finger(username),
 228          {:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do
 229       {:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)}
 230     else e ->
 231       Logger.debug(fn -> "Couldn't gather info for #{username}" end)
 232       {:error, e}
 233     end
 234   end
 235
 236   # Regex-based 'parsing' so we don't have to pull in a full html parser
 237   # It's a hack anyway. Maybe revisit this in the future
 238   @mastodon_regex ~r/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
 239   @gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
 240   def get_atom_url(body) do
 241     cond do
 242       Regex.match?(@mastodon_regex, body) ->
 243         [[_, match]] = Regex.scan(@mastodon_regex, body)
 244         {:ok, match}
 245       Regex.match?(@gs_regex, body) ->
 246         [[_, match]] = Regex.scan(@gs_regex, body)
 247         {:ok, match}
 248       true ->
 249         Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end)
 250         {:error, "Couldn't find the atom link"}
 251     end
 252   end
 253
 254   def fetch_activity_from_html_url(url) do
 255     with {:ok, %{body: body}} <- @httpoison.get(url),
 256          {:ok, atom_url} <- get_atom_url(body),
 257          {:ok, %{status_code: code, body: body}} when code in 200..299 <- @httpoison.get(atom_url) do
 258       handle_incoming(body)
 259     end
 260   end
 261 end