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.{WebFinger, Websub}
  11   alias Pleroma.Web.OStatus.FollowHandler
  12
  13   def feed_path(user) do
  14     "#{user.ap_id}/feed.atom"
  15   end
  16
  17   def pubsub_path(user) do
  18     "#{Web.base_url}/push/hub/#{user.nickname}"
  19   end
  20
  21   def salmon_path(user) do
  22     "#{user.ap_id}/salmon"
  23   end
  24
  25   def handle_incoming(xml_string) do
  26     doc = parse_document(xml_string)
  27     entries = :xmerl_xpath.string('//entry', doc)
  28
  29     activities = Enum.map(entries, fn (entry) ->
  30       {:xmlObj, :string, object_type} = :xmerl_xpath.string('string(/entry/activity:object-type[1])', entry)
  31       {:xmlObj, :string, verb} = :xmerl_xpath.string('string(/entry/activity:verb[1])', entry)
  32
  33       case verb do
  34         'http://activitystrea.ms/schema/1.0/follow' ->
  35           with {:ok, activity} <- FollowHandler.handle(entry, doc), do: activity
  36         'http://activitystrea.ms/schema/1.0/share' ->
  37           with {:ok, activity, retweeted_activity} <- handle_share(entry, doc), do: [activity, retweeted_activity]
  38         'http://activitystrea.ms/schema/1.0/favorite' ->
  39           with {:ok, activity, favorited_activity} <- handle_favorite(entry, doc), do: [activity, favorited_activity]
  40         _ ->
  41           case object_type do
  42             'http://activitystrea.ms/schema/1.0/note' ->
  43               with {:ok, activity} <- handle_note(entry, doc), do: activity
  44             'http://activitystrea.ms/schema/1.0/comment' ->
  45               with {:ok, activity} <- handle_note(entry, doc), do: activity
  46             _ ->
  47               Logger.error("Couldn't parse incoming document")
  48               nil
  49           end
  50       end
  51     end)
  52     {:ok, activities}
  53   end
  54
  55   def make_share(entry, doc, retweeted_activity) do
  56     with {:ok, actor} <- find_make_or_update_user(doc),
  57          %Object{} = object <- Object.get_by_ap_id(retweeted_activity.data["object"]["id"]),
  58          id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
  59          {:ok, activity, _object} = ActivityPub.announce(actor, object, id, false) do
  60       {:ok, activity}
  61     end
  62   end
  63
  64   def handle_share(entry, doc) do
  65     with [object] <- :xmerl_xpath.string('/entry/activity:object', entry),
  66          {:ok, retweeted_activity} <-  handle_note(object, object),
  67          {:ok, activity} <- make_share(entry, doc, retweeted_activity) do
  68       {:ok, activity, retweeted_activity}
  69     else
  70       e -> {:error, e}
  71     end
  72   end
  73
  74   def make_favorite(entry, doc, favorited_activity) do
  75     with {:ok, actor} <- find_make_or_update_user(doc),
  76          %Object{} = object <- Object.get_by_ap_id(favorited_activity.data["object"]["id"]),
  77          id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
  78          {:ok, activity, _object} = ActivityPub.like(actor, object, id, false) do
  79       {:ok, activity}
  80     end
  81   end
  82
  83   def get_or_try_fetching(entry) do
  84     Logger.debug("Trying to get entry from db")
  85     with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry),
  86          %Activity{} = activity <- Activity.get_create_activity_by_object_ap_id(id) do
  87       {:ok, activity}
  88     else e ->
  89         Logger.debug("Couldn't get, will try to fetch")
  90         with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry),
  91              {:ok, [favorited_activity]} <- fetch_activity_from_html_url(href) do
  92           {:ok, favorited_activity}
  93         else e -> Logger.debug("Couldn't find href: #{inspect(e)}")
  94         end
  95     end
  96   end
  97
  98   def handle_favorite(entry, doc) do
  99     with {:ok, favorited_activity} <- get_or_try_fetching(entry),
 100          {:ok, activity} <- make_favorite(entry, doc, favorited_activity) do
 101       {:ok, activity, favorited_activity}
 102     else
 103       e -> {:error, e}
 104     end
 105   end
 106
 107   def get_attachments(entry) do
 108     :xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry)
 109     |> Enum.map(fn (enclosure) ->
 110       with href when not is_nil(href) <- string_from_xpath("/link/@href", enclosure),
 111            type when not is_nil(type) <- string_from_xpath("/link/@type", enclosure) do
 112         %{
 113           "type" => "Attachment",
 114           "url" => [%{
 115                        "type" => "Link",
 116                        "mediaType" => type,
 117                        "href" => href
 118                     }]
 119         }
 120       end
 121     end)
 122     |> Enum.filter(&(&1))
 123   end
 124
 125   def get_content(entry) do
 126     base_content = string_from_xpath("//content", entry)
 127
 128     with scope when not is_nil(scope) <- string_from_xpath("//mastodon:scope", entry),
 129          cw when not is_nil(cw) <- string_from_xpath("/*/summary", entry) do
 130       "<span class='mastodon-cw'>#{cw}</span><br>#{base_content}"
 131     else _e -> base_content
 132     end
 133   end
 134
 135   def handle_note(entry, doc \\ nil) do
 136     content_html = get_content(entry)
 137
 138     [author] = :xmerl_xpath.string('//author[1]', doc)
 139     {:ok, actor} = find_make_or_update_user(author)
 140     inReplyTo = string_from_xpath("//thr:in-reply-to[1]/@ref", entry)
 141
 142     if inReplyTo && !Object.get_cached_by_ap_id(inReplyTo) do
 143       inReplyToHref = string_from_xpath("//thr:in-reply-to[1]/@href", entry)
 144       if inReplyToHref do
 145         fetch_activity_from_html_url(inReplyToHref)
 146       else
 147         Logger.debug("Couldn't find a href link to #{inReplyTo}")
 148       end
 149     end
 150
 151     context = (string_from_xpath("//ostatus:conversation[1]", entry) || "") |> String.trim
 152
 153     attachments = get_attachments(entry)
 154
 155     context = with %{data: %{"context" => context}} <- Object.get_cached_by_ap_id(inReplyTo) do
 156                 context
 157               else _e ->
 158                 if String.length(context) > 0 do
 159                   context
 160                 else
 161                   ActivityPub.generate_context_id
 162                 end
 163               end
 164
 165     to = [
 166       "https://www.w3.org/ns/activitystreams#Public",
 167       User.ap_followers(actor)
 168     ]
 169
 170     mentions = :xmerl_xpath.string('//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/person"]', entry)
 171     |> Enum.map(fn(person) -> string_from_xpath("@href", person) end)
 172
 173     to = to ++ mentions
 174
 175     date = string_from_xpath("//published", entry)
 176     id = string_from_xpath("//id", entry)
 177
 178     object = %{
 179       "id" => id,
 180       "type" => "Note",
 181       "to" => to,
 182       "content" => content_html,
 183       "published" => date,
 184       "context" => context,
 185       "actor" => actor.ap_id,
 186       "attachment" => attachments
 187     }
 188
 189     object = if inReplyTo do
 190       Map.put(object, "inReplyTo", inReplyTo)
 191     else
 192       object
 193     end
 194
 195     # TODO: Bail out sooner and use transaction.
 196     if Object.get_by_ap_id(id) do
 197       {:ok, Activity.get_create_activity_by_object_ap_id(id)}
 198     else
 199       ActivityPub.create(to, actor, context, object, %{}, date, false)
 200     end
 201   end
 202
 203   def find_make_or_update_user(doc) do
 204     uri = string_from_xpath("//author/uri[1]", doc)
 205     with {:ok, user} <- find_or_make_user(uri) do
 206       avatar = make_avatar_object(doc)
 207       if !user.local && user.avatar != avatar do
 208         change = Ecto.Changeset.change(user, %{avatar: avatar})
 209         Repo.update(change)
 210       else
 211         {:ok, user}
 212       end
 213     end
 214   end
 215
 216   def find_or_make_user(uri) do
 217     query = from user in User,
 218       where: user.ap_id == ^uri
 219
 220     user = Repo.one(query)
 221
 222     if is_nil(user) do
 223       make_user(uri)
 224     else
 225       {:ok, user}
 226     end
 227   end
 228
 229   def make_user(uri) do
 230     with {:ok, info} <- gather_user_info(uri) do
 231       data = %{
 232         name: info["name"],
 233         nickname: info["nickname"] <> "@" <> info["host"],
 234         ap_id: info["uri"],
 235         info: info,
 236         avatar: info["avatar"]
 237       }
 238       cs = User.remote_user_creation(data)
 239       Repo.insert(cs)
 240     end
 241   end
 242
 243   # TODO: Just takes the first one for now.
 244   def make_avatar_object(author_doc) do
 245     href = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@href", author_doc)
 246     type = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@type", author_doc)
 247
 248     if href do
 249       %{
 250         "type" => "Image",
 251         "url" =>
 252           [%{
 253               "type" => "Link",
 254               "mediaType" => type,
 255               "href" => href
 256            }]
 257       }
 258     else
 259       nil
 260     end
 261   end
 262
 263   def gather_user_info(username) do
 264     with {:ok, webfinger_data} <- WebFinger.finger(username),
 265          {:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do
 266       {:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)}
 267     else e ->
 268       Logger.debug(fn -> "Couldn't gather info for #{username}" end)
 269       {:error, e}
 270     end
 271   end
 272
 273   # Regex-based 'parsing' so we don't have to pull in a full html parser
 274   # It's a hack anyway. Maybe revisit this in the future
 275   @mastodon_regex ~r/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
 276   @gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
 277   @gs_classic_regex ~r/<link rel="alternate" href="(.*)" type="application\/atom\+xml" title=.*>/
 278   def get_atom_url(body) do
 279     cond do
 280       Regex.match?(@mastodon_regex, body) ->
 281         [[_, match]] = Regex.scan(@mastodon_regex, body)
 282         {:ok, match}
 283       Regex.match?(@gs_regex, body) ->
 284         [[_, match]] = Regex.scan(@gs_regex, body)
 285         {:ok, match}
 286       Regex.match?(@gs_classic_regex, body) ->
 287         [[_, match]] = Regex.scan(@gs_classic_regex, body)
 288         {:ok, match}
 289       true ->
 290         Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end)
 291         {:error, "Couldn't find the atom link"}
 292     end
 293   end
 294
 295   def fetch_activity_from_html_url(url) do
 296     Logger.debug("Trying to fetch #{url}")
 297     with {:ok, %{body: body}} <- @httpoison.get(url, [], follow_redirect: true),
 298          {:ok, atom_url} <- get_atom_url(body),
 299          {:ok, %{status_code: code, body: body}} when code in 200..299 <- @httpoison.get(atom_url, [], follow_redirect: true) do
 300       Logger.debug("Got document from #{url}, handling...")
 301       handle_incoming(body)
 302     else e -> Logger.debug("Couldn't get #{url}: #{inspect(e)}")
 303     end
 304   end
 305 end