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
  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
  34       case verb do
  35         'http://activitystrea.ms/schema/1.0/follow' ->
  36           with {:ok, activity} <- FollowHandler.handle(entry, doc), do: activity
  37         'http://activitystrea.ms/schema/1.0/share' ->
  38           with {:ok, activity, retweeted_activity} <- handle_share(entry, doc), do: [activity, retweeted_activity]
  39         'http://activitystrea.ms/schema/1.0/favorite' ->
  40           with {:ok, activity, favorited_activity} <- handle_favorite(entry, doc), do: [activity, favorited_activity]
  41         _ ->
  42           case object_type do
  43             'http://activitystrea.ms/schema/1.0/note' ->
  44               with {:ok, activity} <- handle_note(entry, doc), do: activity
  45             'http://activitystrea.ms/schema/1.0/comment' ->
  46               with {:ok, activity} <- handle_note(entry, doc), do: activity
  47             _ ->
  48               Logger.error("Couldn't parse incoming document")
  49               nil
  50           end
  51       end
  52     end)
  53     {:ok, activities}
  54   end
  55
  56   def make_share(entry, doc, retweeted_activity) do
  57     with {:ok, actor} <- find_make_or_update_user(doc),
  58          %Object{} = object <- Object.get_by_ap_id(retweeted_activity.data["object"]["id"]),
  59          id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
  60          {:ok, activity, _object} = ActivityPub.announce(actor, object, id, false) do
  61       {:ok, activity}
  62     end
  63   end
  64
  65   def handle_share(entry, doc) do
  66     with {:ok, retweeted_activity} <- get_or_build_object(entry),
  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_build_object(entry) do
  84     with {:ok, activity} <- get_or_try_fetching(entry) do
  85       {:ok, activity}
  86     else
  87       _e ->
  88         with [object] <- :xmerl_xpath.string('/entry/activity:object', entry) do
  89           handle_note(object, object)
  90         end
  91     end
  92   end
  93
  94
  95   def get_or_try_fetching(entry) do
  96     Logger.debug("Trying to get entry from db")
  97     with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry),
  98          %Activity{} = activity <- Activity.get_create_activity_by_object_ap_id(id) do
  99       {:ok, activity}
 100     else e ->
 101         Logger.debug("Couldn't get, will try to fetch")
 102         with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry),
 103              {:ok, [favorited_activity]} <- fetch_activity_from_html_url(href) do
 104           {:ok, favorited_activity}
 105         else e -> Logger.debug("Couldn't find href: #{inspect(e)}")
 106         end
 107     end
 108   end
 109
 110   def handle_favorite(entry, doc) do
 111     with {:ok, favorited_activity} <- get_or_try_fetching(entry),
 112          {:ok, activity} <- make_favorite(entry, doc, favorited_activity) do
 113       {:ok, activity, favorited_activity}
 114     else
 115       e -> {:error, e}
 116     end
 117   end
 118
 119   def get_attachments(entry) do
 120     :xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry)
 121     |> Enum.map(fn (enclosure) ->
 122       with href when not is_nil(href) <- string_from_xpath("/link/@href", enclosure),
 123            type when not is_nil(type) <- string_from_xpath("/link/@type", enclosure) do
 124         %{
 125           "type" => "Attachment",
 126           "url" => [%{
 127                        "type" => "Link",
 128                        "mediaType" => type,
 129                        "href" => href
 130                     }]
 131         }
 132       end
 133     end)
 134     |> Enum.filter(&(&1))
 135   end
 136
 137   def get_content(entry) do
 138     base_content = string_from_xpath("//content", entry)
 139
 140     with scope when not is_nil(scope) <- string_from_xpath("//mastodon:scope", entry),
 141          cw when not is_nil(cw) <- string_from_xpath("/*/summary", entry) do
 142       "<span class='mastodon-cw'>#{cw}</span><br>#{base_content}"
 143     else _e -> base_content
 144     end
 145   end
 146
 147   def get_tags(entry) do
 148     :xmerl_xpath.string('//category', entry)
 149     |> Enum.map(fn (category) -> string_from_xpath("/category/@term", category) end)
 150   end
 151
 152   def handle_note(entry, doc \\ nil) do
 153     content_html = get_content(entry)
 154
 155     [author] = :xmerl_xpath.string('//author[1]', doc)
 156     {:ok, actor} = find_make_or_update_user(author)
 157     inReplyTo = string_from_xpath("//thr:in-reply-to[1]/@ref", entry)
 158
 159     if inReplyTo && !Object.get_cached_by_ap_id(inReplyTo) do
 160       inReplyToHref = string_from_xpath("//thr:in-reply-to[1]/@href", entry)
 161       if inReplyToHref do
 162         fetch_activity_from_html_url(inReplyToHref)
 163       else
 164         Logger.debug("Couldn't find a href link to #{inReplyTo}")
 165       end
 166     end
 167
 168     context = (string_from_xpath("//ostatus:conversation[1]", entry) || "") |> String.trim
 169
 170     attachments = get_attachments(entry)
 171
 172     context = with %{data: %{"context" => context}} <- Object.get_cached_by_ap_id(inReplyTo) do
 173                 context
 174               else _e ->
 175                 if String.length(context) > 0 do
 176                   context
 177                 else
 178                   Utils.generate_context_id
 179                 end
 180               end
 181
 182     tags = get_tags(entry)
 183
 184     to = [
 185       "https://www.w3.org/ns/activitystreams#Public",
 186       User.ap_followers(actor)
 187     ]
 188
 189     mentions = :xmerl_xpath.string('//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/person"]', entry)
 190     |> Enum.map(fn(person) -> string_from_xpath("@href", person) end)
 191
 192     to = to ++ mentions
 193
 194     date = string_from_xpath("//published", entry)
 195     id = string_from_xpath("//id", entry)
 196
 197     object = %{
 198       "id" => id,
 199       "type" => "Note",
 200       "to" => to,
 201       "content" => content_html,
 202       "published" => date,
 203       "context" => context,
 204       "actor" => actor.ap_id,
 205       "attachment" => attachments,
 206       "tag" => tags
 207     }
 208
 209     object = if inReplyTo do
 210       replied_to_activity = Activity.get_create_activity_by_object_ap_id(inReplyTo)
 211       if replied_to_activity do
 212         object
 213         |> Map.put("inReplyTo", inReplyTo)
 214         |> Map.put("inReplyToStatusId", replied_to_activity.id)
 215       else
 216         object
 217         |> Map.put("inReplyTo", inReplyTo)
 218       end
 219     else
 220       object
 221     end
 222
 223     # TODO: Bail out sooner and use transaction.
 224     if Object.get_by_ap_id(id) do
 225       {:ok, Activity.get_create_activity_by_object_ap_id(id)}
 226     else
 227       ActivityPub.create(to, actor, context, object, %{}, date, false)
 228     end
 229   end
 230
 231   def find_make_or_update_user(doc) do
 232     uri = string_from_xpath("//author/uri[1]", doc)
 233     with {:ok, user} <- find_or_make_user(uri) do
 234       avatar = make_avatar_object(doc)
 235       if !user.local && user.avatar != avatar do
 236         change = Ecto.Changeset.change(user, %{avatar: avatar})
 237         Repo.update(change)
 238       else
 239         {:ok, user}
 240       end
 241     end
 242   end
 243
 244   def find_or_make_user(uri) do
 245     query = from user in User,
 246       where: user.ap_id == ^uri
 247
 248     user = Repo.one(query)
 249
 250     if is_nil(user) do
 251       make_user(uri)
 252     else
 253       {:ok, user}
 254     end
 255   end
 256
 257   def make_user(uri) do
 258     with {:ok, info} <- gather_user_info(uri) do
 259       data = %{
 260         name: info["name"],
 261         nickname: info["nickname"] <> "@" <> info["host"],
 262         ap_id: info["uri"],
 263         info: info,
 264         avatar: info["avatar"]
 265       }
 266       with %User{} = user <- User.get_by_ap_id(data.ap_id) do
 267         {:ok, user}
 268       else _e ->
 269         cs = User.remote_user_creation(data)
 270         Repo.insert(cs)
 271       end
 272     end
 273   end
 274
 275   # TODO: Just takes the first one for now.
 276   def make_avatar_object(author_doc) do
 277     href = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@href", author_doc)
 278     type = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@type", author_doc)
 279
 280     if href do
 281       %{
 282         "type" => "Image",
 283         "url" =>
 284           [%{
 285               "type" => "Link",
 286               "mediaType" => type,
 287               "href" => href
 288            }]
 289       }
 290     else
 291       nil
 292     end
 293   end
 294
 295   def gather_user_info(username) do
 296     with {:ok, webfinger_data} <- WebFinger.finger(username),
 297          {:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do
 298       {:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)}
 299     else e ->
 300       Logger.debug(fn -> "Couldn't gather info for #{username}" end)
 301       {:error, e}
 302     end
 303   end
 304
 305   # Regex-based 'parsing' so we don't have to pull in a full html parser
 306   # It's a hack anyway. Maybe revisit this in the future
 307   @mastodon_regex ~r/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
 308   @gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
 309   @gs_classic_regex ~r/<link rel="alternate" href="(.*)" type="application\/atom\+xml" title=.*>/
 310   def get_atom_url(body) do
 311     cond do
 312       Regex.match?(@mastodon_regex, body) ->
 313         [[_, match]] = Regex.scan(@mastodon_regex, body)
 314         {:ok, match}
 315       Regex.match?(@gs_regex, body) ->
 316         [[_, match]] = Regex.scan(@gs_regex, body)
 317         {:ok, match}
 318       Regex.match?(@gs_classic_regex, body) ->
 319         [[_, match]] = Regex.scan(@gs_classic_regex, body)
 320         {:ok, match}
 321       true ->
 322         Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end)
 323         {:error, "Couldn't find the atom link"}
 324     end
 325   end
 326
 327   def fetch_activity_from_html_url(url) do
 328     Logger.debug("Trying to fetch #{url}")
 329     with {:ok, %{body: body}} <- @httpoison.get(url, [], follow_redirect: true),
 330          {:ok, atom_url} <- get_atom_url(body),
 331          {:ok, %{status_code: code, body: body}} when code in 200..299 <- @httpoison.get(atom_url, [], follow_redirect: true) do
 332       Logger.debug("Got document from #{url}, handling...")
 333       handle_incoming(body)
 334     else e -> Logger.debug("Couldn't get #{url}: #{inspect(e)}")
 335     end
 336   end
 337 end