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