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     with doc when doc != :error <- parse_document(xml_string) do
  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(xml_string)
  60           Logger.error(inspect(e))
  61           nil
  62         end
  63       end)
  64       |> Enum.filter(&(&1))
  65
  66       {:ok, activities}
  67     else
  68       _e -> {:error, []}
  69     end
  70   end
  71
  72   def make_share(entry, doc, retweeted_activity) do
  73     with {:ok, actor} <- find_make_or_update_user(doc),
  74          %Object{} = object <- Object.get_by_ap_id(retweeted_activity.data["object"]["id"]),
  75          id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
  76          {:ok, activity, _object} = ActivityPub.announce(actor, object, id, false) do
  77       {:ok, activity}
  78     end
  79   end
  80
  81   def handle_share(entry, doc) do
  82     with {:ok, retweeted_activity} <- get_or_build_object(entry),
  83          {:ok, activity} <- make_share(entry, doc, retweeted_activity) do
  84       {:ok, activity, retweeted_activity}
  85     else
  86       e -> {:error, e}
  87     end
  88   end
  89
  90   def make_favorite(entry, doc, favorited_activity) do
  91     with {:ok, actor} <- find_make_or_update_user(doc),
  92          %Object{} = object <- Object.get_by_ap_id(favorited_activity.data["object"]["id"]),
  93          id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
  94          {:ok, activity, _object} = ActivityPub.like(actor, object, id, false) do
  95       {:ok, activity}
  96     end
  97   end
  98
  99   def get_or_build_object(entry) do
 100     with {:ok, activity} <- get_or_try_fetching(entry) do
 101       {:ok, activity}
 102     else
 103       _e ->
 104         with [object] <- :xmerl_xpath.string('/entry/activity:object', entry) do
 105           NoteHandler.handle_note(object, object)
 106         end
 107     end
 108   end
 109
 110   def get_or_try_fetching(entry) do
 111     Logger.debug("Trying to get entry from db")
 112     with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry),
 113          %Activity{} = activity <- Activity.get_create_activity_by_object_ap_id(id) do
 114       {:ok, activity}
 115     else e ->
 116         Logger.debug("Couldn't get, will try to fetch")
 117         with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry),
 118              {:ok, [favorited_activity]} <- fetch_activity_from_url(href) do
 119           {:ok, favorited_activity}
 120         else e -> Logger.debug("Couldn't find href: #{inspect(e)}")
 121         end
 122     end
 123   end
 124
 125   def handle_favorite(entry, doc) do
 126     with {:ok, favorited_activity} <- get_or_try_fetching(entry),
 127          {:ok, activity} <- make_favorite(entry, doc, favorited_activity) do
 128       {:ok, activity, favorited_activity}
 129     else
 130       e -> {:error, e}
 131     end
 132   end
 133
 134   def get_attachments(entry) do
 135     :xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry)
 136     |> Enum.map(fn (enclosure) ->
 137       with href when not is_nil(href) <- string_from_xpath("/link/@href", enclosure),
 138            type when not is_nil(type) <- string_from_xpath("/link/@type", enclosure) do
 139         %{
 140           "type" => "Attachment",
 141           "url" => [%{
 142                        "type" => "Link",
 143                        "mediaType" => type,
 144                        "href" => href
 145                     }]
 146         }
 147       end
 148     end)
 149     |> Enum.filter(&(&1))
 150   end
 151
 152   @doc """
 153     Gets the content from a an entry.
 154   """
 155   def get_content(entry) do
 156     string_from_xpath("//content", entry)
 157   end
 158
 159   @doc """
 160     Get the cw that mastodon uses.
 161   """
 162   def get_cw(entry) do
 163     with scope when not is_nil(scope) <- string_from_xpath("//mastodon:scope", entry),
 164          cw when not is_nil(cw) <- string_from_xpath("/*/summary", entry) do
 165       cw
 166     else _e -> nil
 167     end
 168   end
 169
 170   def get_tags(entry) do
 171     :xmerl_xpath.string('//category', entry)
 172     |> Enum.map(fn (category) -> string_from_xpath("/category/@term", category) end)
 173     |> Enum.filter(&(&1))
 174     |> Enum.map(&String.downcase/1)
 175   end
 176
 177   def maybe_update(doc, user) do
 178     old_data = %{
 179       avatar: user.avatar,
 180       bio: user.bio,
 181       name: user.name,
 182       info: user.info
 183     }
 184
 185     with false <- user.local,
 186          avatar <- make_avatar_object(doc),
 187          bio <- string_from_xpath("//author[1]/summary", doc),
 188          name <- string_from_xpath("//author[1]/poco:displayName", doc),
 189          info <- Map.put(user.info, "banner", make_avatar_object(doc, "header") || user.info["banner"]),
 190          new_data <- %{avatar: avatar || old_data.avatar, name: name || old_data.name, bio: bio || old_data.bio, info: info || old_data.info},
 191          false <- new_data == old_data do
 192       change = Ecto.Changeset.change(user, new_data)
 193       Repo.update(change)
 194     else e ->
 195       {:ok, user}
 196     end
 197   end
 198
 199   def find_make_or_update_user(doc) do
 200     uri = string_from_xpath("//author/uri[1]", doc)
 201     with {:ok, user} <- find_or_make_user(uri) do
 202       maybe_update(doc, user)
 203     end
 204   end
 205
 206   def find_or_make_user(uri) do
 207     query = from user in User,
 208       where: user.ap_id == ^uri
 209
 210     user = Repo.one(query)
 211
 212     if is_nil(user) do
 213       make_user(uri)
 214     else
 215       {:ok, user}
 216     end
 217   end
 218
 219   def insert_or_update_user(data) do
 220     cs = User.remote_user_creation(data)
 221     Repo.insert(cs, on_conflict: :replace_all, conflict_target: :nickname)
 222   end
 223
 224   def make_user(uri) do
 225     with {:ok, info} <- gather_user_info(uri) do
 226       data = %{
 227         name: info["name"],
 228         nickname: info["nickname"] <> "@" <> info["host"],
 229         ap_id: info["uri"],
 230         info: info,
 231         avatar: info["avatar"],
 232         bio: info["bio"]
 233       }
 234       with %User{} = user <- User.get_by_ap_id(data.ap_id) do
 235         {:ok, user}
 236       else _e -> insert_or_update_user(data)
 237       end
 238     end
 239   end
 240
 241   # TODO: Just takes the first one for now.
 242   def make_avatar_object(author_doc, rel \\ "avatar") do
 243     href = string_from_xpath("//author[1]/link[@rel=\"#{rel}\"]/@href", author_doc)
 244     type = string_from_xpath("//author[1]/link[@rel=\"#{rel}\"]/@type", author_doc)
 245
 246     if href do
 247       %{
 248         "type" => "Image",
 249         "url" =>
 250           [%{
 251               "type" => "Link",
 252               "mediaType" => type,
 253               "href" => href
 254            }]
 255       }
 256     else
 257       nil
 258     end
 259   end
 260
 261   def gather_user_info(username) do
 262     with {:ok, webfinger_data} <- WebFinger.finger(username),
 263          {:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do
 264       {:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)}
 265     else e ->
 266       Logger.debug(fn -> "Couldn't gather info for #{username}" end)
 267       {:error, e}
 268     end
 269   end
 270
 271   # Regex-based 'parsing' so we don't have to pull in a full html parser
 272   # It's a hack anyway. Maybe revisit this in the future
 273   @mastodon_regex ~r/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
 274   @gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
 275   @gs_classic_regex ~r/<link rel="alternate" href="(.*)" type="application\/atom\+xml" title=.*>/
 276   def get_atom_url(body) do
 277     cond do
 278       Regex.match?(@mastodon_regex, body) ->
 279         [[_, match]] = Regex.scan(@mastodon_regex, body)
 280         {:ok, match}
 281       Regex.match?(@gs_regex, body) ->
 282         [[_, match]] = Regex.scan(@gs_regex, body)
 283         {:ok, match}
 284       Regex.match?(@gs_classic_regex, body) ->
 285         [[_, match]] = Regex.scan(@gs_classic_regex, body)
 286         {:ok, match}
 287       true ->
 288         Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end)
 289         {:error, "Couldn't find the atom link"}
 290     end
 291   end
 292
 293   def fetch_activity_from_atom_url(url) do
 294     with {:ok, %{body: body, status_code: code}} when code in 200..299 <- @httpoison.get(url, [Accept: "application/atom+xml"], follow_redirect: true, timeout: 10000, recv_timeout: 20000) do
 295       Logger.debug("Got document from #{url}, handling...")
 296       handle_incoming(body)
 297     else e -> Logger.debug("Couldn't get #{url}: #{inspect(e)}")
 298     end
 299   end
 300
 301   def fetch_activity_from_html_url(url) do
 302     Logger.debug("Trying to fetch #{url}")
 303     with {:ok, %{body: body}} <- @httpoison.get(url, [], follow_redirect: true, timeout: 10000, recv_timeout: 20000),
 304          {:ok, atom_url} <- get_atom_url(body) do
 305         fetch_activity_from_atom_url(atom_url)
 306     else e -> Logger.debug("Couldn't get #{url}: #{inspect(e)}")
 307     end
 308   end
 309
 310   def fetch_activity_from_url(url) do
 311     try do
 312       with {:ok, activities} when length(activities) > 0 <- fetch_activity_from_atom_url(url) do
 313         {:ok, activities}
 314       else
 315         _e -> with {:ok, activities} <- fetch_activity_from_html_url(url) do
 316                 {:ok, activities}
 317               end
 318       end
 319     rescue
 320       e ->
 321         Logger.debug("Couldn't get #{url}: #{inspect(e)}")
 322         {:error, "Couldn't get #{url}: #{inspect(e)}"}
 323     end
 324   end
 325 end