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, Activity}
   9   alias Pleroma.Web.ActivityPub.ActivityPub
  10   alias Pleroma.Web.ActivityPub.Utils
  11   alias Pleroma.Web.{WebFinger, Websub}
  12   alias Pleroma.Web.OStatus.{FollowHandler, NoteHandler}
  13
  14   def feed_path(user) do
  15     "#{user.ap_id}/feed.atom"
  16   end
  17
  18   def pubsub_path(user) do
  19     "#{Web.base_url}/push/hub/#{user.nickname}"
  20   end
  21
  22   def salmon_path(user) do
  23     "#{user.ap_id}/salmon"
  24   end
  25
  26   def handle_incoming(xml_string) do
  27     doc = parse_document(xml_string)
  28     entries = :xmerl_xpath.string('//entry', doc)
  29
  30     activities = Enum.map(entries, fn (entry) ->
  31       {:xmlObj, :string, object_type} = :xmerl_xpath.string('string(/entry/activity:object-type[1])', entry)
  32       {:xmlObj, :string, verb} = :xmerl_xpath.string('string(/entry/activity:verb[1])', entry)
  33       Logger.debug("Handling #{verb}")
  34
  35       try do
  36         case verb do
  37           'http://activitystrea.ms/schema/1.0/follow' ->
  38             with {:ok, activity} <- FollowHandler.handle(entry, doc), do: activity
  39           'http://activitystrea.ms/schema/1.0/share' ->
  40             with {:ok, activity, retweeted_activity} <- handle_share(entry, doc), do: [activity, retweeted_activity]
  41           'http://activitystrea.ms/schema/1.0/favorite' ->
  42             with {:ok, activity, favorited_activity} <- handle_favorite(entry, doc), do: [activity, favorited_activity]
  43           _ ->
  44             case object_type do
  45               'http://activitystrea.ms/schema/1.0/note' ->
  46                 with {:ok, activity} <- NoteHandler.handle_note(entry, doc), do: activity
  47               'http://activitystrea.ms/schema/1.0/comment' ->
  48                 with {:ok, activity} <- NoteHandler.handle_note(entry, doc), do: activity
  49               _ ->
  50                 Logger.error("Couldn't parse incoming document")
  51                 nil
  52             end
  53         end
  54       rescue
  55         e ->
  56           Logger.error("Error occured while handling activity")
  57           Logger.error(inspect(e))
  58           nil
  59       end
  60     end)
  61     |> Enum.filter(&(&1))
  62
  63     {:ok, activities}
  64   end
  65
  66   def make_share(entry, doc, retweeted_activity) do
  67     with {:ok, actor} <- find_make_or_update_user(doc),
  68          %Object{} = object <- Object.get_by_ap_id(retweeted_activity.data["object"]["id"]),
  69          id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
  70          {:ok, activity, _object} = ActivityPub.announce(actor, object, id, false) do
  71       {:ok, activity}
  72     end
  73   end
  74
  75   def handle_share(entry, doc) do
  76     with {:ok, retweeted_activity} <- get_or_build_object(entry),
  77          {:ok, activity} <- make_share(entry, doc, retweeted_activity) do
  78       {:ok, activity, retweeted_activity}
  79     else
  80       e -> {:error, e}
  81     end
  82   end
  83
  84   def make_favorite(entry, doc, favorited_activity) do
  85     with {:ok, actor} <- find_make_or_update_user(doc),
  86          %Object{} = object <- Object.get_by_ap_id(favorited_activity.data["object"]["id"]),
  87          id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
  88          {:ok, activity, _object} = ActivityPub.like(actor, object, id, false) do
  89       {:ok, activity}
  90     end
  91   end
  92
  93   def get_or_build_object(entry) do
  94     with {:ok, activity} <- get_or_try_fetching(entry) do
  95       {:ok, activity}
  96     else
  97       _e ->
  98         with [object] <- :xmerl_xpath.string('/entry/activity:object', entry) do
  99           NoteHandler.handle_note(object, object)
 100         end
 101     end
 102   end
 103
 104   def get_or_try_fetching(entry) do
 105     Logger.debug("Trying to get entry from db")
 106     with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry),
 107          %Activity{} = activity <- Activity.get_create_activity_by_object_ap_id(id) do
 108       {:ok, activity}
 109     else e ->
 110         Logger.debug("Couldn't get, will try to fetch")
 111         with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry),
 112              {:ok, [favorited_activity]} <- fetch_activity_from_html_url(href) do
 113           {:ok, favorited_activity}
 114         else e -> Logger.debug("Couldn't find href: #{inspect(e)}")
 115         end
 116     end
 117   end
 118
 119   def handle_favorite(entry, doc) do
 120     with {:ok, favorited_activity} <- get_or_try_fetching(entry),
 121          {:ok, activity} <- make_favorite(entry, doc, favorited_activity) do
 122       {:ok, activity, favorited_activity}
 123     else
 124       e -> {:error, e}
 125     end
 126   end
 127
 128   def get_attachments(entry) do
 129     :xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry)
 130     |> Enum.map(fn (enclosure) ->
 131       with href when not is_nil(href) <- string_from_xpath("/link/@href", enclosure),
 132            type when not is_nil(type) <- string_from_xpath("/link/@type", enclosure) do
 133         %{
 134           "type" => "Attachment",
 135           "url" => [%{
 136                        "type" => "Link",
 137                        "mediaType" => type,
 138                        "href" => href
 139                     }]
 140         }
 141       end
 142     end)
 143     |> Enum.filter(&(&1))
 144   end
 145
 146   @doc """
 147     Gets the content from a an entry. Will add the cw text to the body for cw'd
 148     Mastodon notes.
 149   """
 150   def get_content(entry) do
 151     base_content = string_from_xpath("//content", entry)
 152
 153     with scope when not is_nil(scope) <- string_from_xpath("//mastodon:scope", entry),
 154          cw when not is_nil(cw) <- string_from_xpath("/*/summary", entry) do
 155       "<span class='mastodon-cw'>#{cw}</span><br>#{base_content}"
 156     else _e -> base_content
 157     end
 158   end
 159
 160   def get_tags(entry) do
 161     :xmerl_xpath.string('//category', entry)
 162     |> Enum.map(fn (category) -> string_from_xpath("/category/@term", category) |> String.downcase end)
 163   end
 164
 165   def maybe_update(doc, user) do
 166     old_data = %{
 167       avatar: user.avatar,
 168       bio: user.bio,
 169       name: user.name
 170     }
 171
 172     with false <- user.local,
 173          avatar <- make_avatar_object(doc),
 174          bio <- string_from_xpath("//author[1]/summary", doc),
 175          name when not is_nil(name) <- string_from_xpath("//author[1]/poco:displayName", doc),
 176          new_data <- %{avatar: avatar, name: name, bio: bio},
 177          false <- new_data == old_data do
 178       change = Ecto.Changeset.change(user, new_data)
 179       Repo.update(change)
 180     else e ->
 181       {:ok, user}
 182     end
 183   end
 184
 185   def find_make_or_update_user(doc) do
 186     uri = string_from_xpath("//author/uri[1]", doc)
 187     with {:ok, user} <- find_or_make_user(uri) do
 188       maybe_update(doc, user)
 189     end
 190   end
 191
 192   def find_or_make_user(uri) do
 193     query = from user in User,
 194       where: user.ap_id == ^uri
 195
 196     user = Repo.one(query)
 197
 198     if is_nil(user) do
 199       make_user(uri)
 200     else
 201       {:ok, user}
 202     end
 203   end
 204
 205   def insert_or_update_user(data) do
 206     cs = User.remote_user_creation(data)
 207     Repo.insert(cs, on_conflict: :replace_all, conflict_target: :nickname)
 208   end
 209
 210   def make_user(uri) do
 211     with {:ok, info} <- gather_user_info(uri) do
 212       data = %{
 213         name: info["name"],
 214         nickname: info["nickname"] <> "@" <> info["host"],
 215         ap_id: info["uri"],
 216         info: info,
 217         avatar: info["avatar"],
 218         bio: info["bio"]
 219       }
 220       with %User{} = user <- User.get_by_ap_id(data.ap_id) do
 221         {:ok, user}
 222       else _e -> insert_or_update_user(data)
 223       end
 224     end
 225   end
 226
 227   # TODO: Just takes the first one for now.
 228   def make_avatar_object(author_doc) do
 229     href = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@href", author_doc)
 230     type = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@type", author_doc)
 231
 232     if href do
 233       %{
 234         "type" => "Image",
 235         "url" =>
 236           [%{
 237               "type" => "Link",
 238               "mediaType" => type,
 239               "href" => href
 240            }]
 241       }
 242     else
 243       nil
 244     end
 245   end
 246
 247   def gather_user_info(username) do
 248     with {:ok, webfinger_data} <- WebFinger.finger(username),
 249          {:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do
 250       {:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)}
 251     else e ->
 252       Logger.debug(fn -> "Couldn't gather info for #{username}" end)
 253       {:error, e}
 254     end
 255   end
 256
 257   # Regex-based 'parsing' so we don't have to pull in a full html parser
 258   # It's a hack anyway. Maybe revisit this in the future
 259   @mastodon_regex ~r/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
 260   @gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
 261   @gs_classic_regex ~r/<link rel="alternate" href="(.*)" type="application\/atom\+xml" title=.*>/
 262   def get_atom_url(body) do
 263     cond do
 264       Regex.match?(@mastodon_regex, body) ->
 265         [[_, match]] = Regex.scan(@mastodon_regex, body)
 266         {:ok, match}
 267       Regex.match?(@gs_regex, body) ->
 268         [[_, match]] = Regex.scan(@gs_regex, body)
 269         {:ok, match}
 270       Regex.match?(@gs_classic_regex, body) ->
 271         [[_, match]] = Regex.scan(@gs_classic_regex, body)
 272         {:ok, match}
 273       true ->
 274         Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end)
 275         {:error, "Couldn't find the atom link"}
 276     end
 277   end
 278
 279   def fetch_activity_from_html_url(url) do
 280     Logger.debug("Trying to fetch #{url}")
 281     with {:ok, %{body: body}} <- @httpoison.get(url, [], follow_redirect: true, timeout: 10000, recv_timeout: 20000),
 282          {:ok, atom_url} <- get_atom_url(body),
 283          {:ok, %{status_code: code, body: body}} when code in 200..299 <- @httpoison.get(atom_url, [], follow_redirect: true, timeout: 10000, recv_timeout: 20000) do
 284       Logger.debug("Got document from #{url}, handling...")
 285       handle_incoming(body)
 286     else e -> Logger.debug("Couldn't get #{url}: #{inspect(e)}")
 287     end
 288   end
 289 end