defmodule Pleroma.Web.OStatus do @httpoison Application.get_env(:pleroma, :httpoison) import Ecto.Query import Pleroma.Web.XML require Logger alias Pleroma.{Repo, User, Web, Object, Activity} alias Pleroma.Web.ActivityPub.ActivityPub alias Pleroma.Web.{WebFinger, Websub} def feed_path(user) do "#{user.ap_id}/feed.atom" end def pubsub_path(user) do "#{Web.base_url}/push/hub/#{user.nickname}" end def salmon_path(user) do "#{user.ap_id}/salmon" end def handle_incoming(xml_string) do doc = parse_document(xml_string) entries = :xmerl_xpath.string('//entry', doc) activities = Enum.map(entries, fn (entry) -> {:xmlObj, :string, object_type} = :xmerl_xpath.string('string(/entry/activity:object-type[1])', entry) {:xmlObj, :string, verb} = :xmerl_xpath.string('string(/entry/activity:verb[1])', entry) case verb do 'http://activitystrea.ms/schema/1.0/share' -> with {:ok, activity, retweeted_activity} <- handle_share(entry, doc), do: [activity, retweeted_activity] 'http://activitystrea.ms/schema/1.0/favorite' -> with {:ok, activity, favorited_activity} <- handle_favorite(entry, doc), do: [activity, favorited_activity] _ -> case object_type do 'http://activitystrea.ms/schema/1.0/note' -> with {:ok, activity} <- handle_note(entry, doc), do: activity 'http://activitystrea.ms/schema/1.0/comment' -> with {:ok, activity} <- handle_note(entry, doc), do: activity _ -> Logger.error("Couldn't parse incoming document") nil end end end) {:ok, activities} end def make_share(entry, doc, retweeted_activity) do with {:ok, actor} <- find_make_or_update_user(doc), %Object{} = object <- Object.get_by_ap_id(retweeted_activity.data["object"]["id"]), id when not is_nil(id) <- string_from_xpath("/entry/id", entry), {:ok, activity, _object} = ActivityPub.announce(actor, object, id, false) do {:ok, activity} end end def handle_share(entry, doc) do with [object] <- :xmerl_xpath.string('/entry/activity:object', entry), {:ok, retweeted_activity} <- handle_note(object, object), {:ok, activity} <- make_share(entry, doc, retweeted_activity) do {:ok, activity, retweeted_activity} else e -> {:error, e} end end def make_favorite(entry, doc, favorited_activity) do with {:ok, actor} <- find_make_or_update_user(doc), %Object{} = object <- Object.get_by_ap_id(favorited_activity.data["object"]["id"]), id when not is_nil(id) <- string_from_xpath("/entry/id", entry), {:ok, activity, _object} = ActivityPub.like(actor, object, id, false) do {:ok, activity} end end def get_or_try_fetching(entry) do with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry), %Activity{} = activity <- Activity.get_create_activity_by_object_ap_id(id) do {:ok, activity} else _e -> with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry), {:ok, [favorited_activity]} <- fetch_activity_from_html_url(href) do {:ok, favorited_activity} end end end def handle_favorite(entry, doc) do with {:ok, favorited_activity} <- get_or_try_fetching(entry), {:ok, activity} <- make_favorite(entry, doc, favorited_activity) do {:ok, activity, favorited_activity} else e -> {:error, e} end end def get_attachments(entry) do :xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry) |> Enum.map(fn (enclosure) -> with href when not is_nil(href) <- string_from_xpath("/link/@href", enclosure), type when not is_nil(type) <- string_from_xpath("/link/@type", enclosure) do %{ "type" => "Attachment", "url" => [%{ "type" => "Link", "mediaType" => type, "href" => href }] } end end) |> Enum.filter(&(&1)) end def handle_note(entry, doc \\ nil) do content_html = string_from_xpath("//content[1]", entry) [author] = :xmerl_xpath.string('//author[1]', doc) {:ok, actor} = find_make_or_update_user(author) inReplyTo = string_from_xpath("//thr:in-reply-to[1]/@ref", entry) if !Object.get_cached_by_ap_id(inReplyTo) do inReplyToHref = string_from_xpath("//thr:in-reply-to[1]/@href", entry) if inReplyToHref do fetch_activity_from_html_url(inReplyToHref) end end context = (string_from_xpath("//ostatus:conversation[1]", entry) || "") |> String.trim attachments = get_attachments(entry) context = with %{data: %{"context" => context}} <- Object.get_cached_by_ap_id(inReplyTo) do context else _e -> if String.length(context) > 0 do context else ActivityPub.generate_context_id end end to = [ "https://www.w3.org/ns/activitystreams#Public", User.ap_followers(actor) ] mentions = :xmerl_xpath.string('//link[@rel="mentioned" and @ostatus:object-type="http://activitystrea.ms/schema/1.0/person"]', entry) |> Enum.map(fn(person) -> string_from_xpath("@href", person) end) to = to ++ mentions date = string_from_xpath("//published", entry) id = string_from_xpath("//id", entry) object = %{ "id" => id, "type" => "Note", "to" => to, "content" => content_html, "published" => date, "context" => context, "actor" => actor.ap_id, "attachment" => attachments } object = if inReplyTo do Map.put(object, "inReplyTo", inReplyTo) else object end # TODO: Bail out sooner and use transaction. if Object.get_by_ap_id(id) do {:ok, Activity.get_create_activity_by_object_ap_id(id)} else ActivityPub.create(to, actor, context, object, %{}, date, false) end end def find_make_or_update_user(doc) do uri = string_from_xpath("//author/uri[1]", doc) with {:ok, user} <- find_or_make_user(uri) do avatar = make_avatar_object(doc) if !user.local && user.avatar != avatar do change = Ecto.Changeset.change(user, %{avatar: avatar}) Repo.update(change) else {:ok, user} end end end def find_or_make_user(uri) do query = from user in User, where: user.ap_id == ^uri user = Repo.one(query) if is_nil(user) do make_user(uri) else {:ok, user} end end def make_user(uri) do with {:ok, info} <- gather_user_info(uri) do data = %{ name: info["name"], nickname: info["nickname"] <> "@" <> info["host"], ap_id: info["uri"], info: info, avatar: info["avatar"] } cs = User.remote_user_creation(data) Repo.insert(cs) end end # TODO: Just takes the first one for now. def make_avatar_object(author_doc) do href = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@href", author_doc) type = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@type", author_doc) if href do %{ "type" => "Image", "url" => [%{ "type" => "Link", "mediaType" => type, "href" => href }] } else nil end end def gather_user_info(username) do with {:ok, webfinger_data} <- WebFinger.finger(username), {:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do {:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)} else e -> Logger.debug(fn -> "Couldn't gather info for #{username}" end) {:error, e} end end # Regex-based 'parsing' so we don't have to pull in a full html parser # It's a hack anyway. Maybe revisit this in the future @mastodon_regex ~r// @gs_regex ~r// @gs_classic_regex ~r// def get_atom_url(body) do cond do Regex.match?(@mastodon_regex, body) -> [[_, match]] = Regex.scan(@mastodon_regex, body) {:ok, match} Regex.match?(@gs_regex, body) -> [[_, match]] = Regex.scan(@gs_regex, body) {:ok, match} Regex.match?(@gs_classic_regex, body) -> [[_, match]] = Regex.scan(@gs_classic_regex, body) {:ok, match} true -> Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end) {:error, "Couldn't find the atom link"} end end def fetch_activity_from_html_url(url) do with {:ok, %{body: body}} <- @httpoison.get(url, [], follow_redirect: true), {:ok, atom_url} <- get_atom_url(body), {:ok, %{status_code: code, body: body}} when code in 200..299 <- @httpoison.get(atom_url, [], follow_redirect: true) do handle_incoming(body) end end end