277 lines
9.2 KiB
Elixir
277 lines
9.2 KiB
Elixir
defmodule Pleroma.Web.OStatus do
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@httpoison Application.get_env(:pleroma, :httpoison)
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import Ecto.Query
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import Pleroma.Web.XML
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require Logger
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alias Pleroma.{Repo, User, Web, Object, Activity}
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alias Pleroma.Web.ActivityPub.ActivityPub
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alias Pleroma.Web.ActivityPub.Utils
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alias Pleroma.Web.{WebFinger, Websub}
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alias Pleroma.Web.OStatus.{FollowHandler, NoteHandler}
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def feed_path(user) do
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"#{user.ap_id}/feed.atom"
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end
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def pubsub_path(user) do
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"#{Web.base_url}/push/hub/#{user.nickname}"
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end
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def salmon_path(user) do
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"#{user.ap_id}/salmon"
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end
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def handle_incoming(xml_string) do
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doc = parse_document(xml_string)
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entries = :xmerl_xpath.string('//entry', doc)
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activities = Enum.map(entries, fn (entry) ->
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{:xmlObj, :string, object_type} = :xmerl_xpath.string('string(/entry/activity:object-type[1])', entry)
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{:xmlObj, :string, verb} = :xmerl_xpath.string('string(/entry/activity:verb[1])', entry)
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case verb do
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'http://activitystrea.ms/schema/1.0/follow' ->
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with {:ok, activity} <- FollowHandler.handle(entry, doc), do: activity
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'http://activitystrea.ms/schema/1.0/share' ->
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with {:ok, activity, retweeted_activity} <- handle_share(entry, doc), do: [activity, retweeted_activity]
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'http://activitystrea.ms/schema/1.0/favorite' ->
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with {:ok, activity, favorited_activity} <- handle_favorite(entry, doc), do: [activity, favorited_activity]
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_ ->
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case object_type do
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'http://activitystrea.ms/schema/1.0/note' ->
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with {:ok, activity} <- NoteHandler.handle_note(entry, doc), do: activity
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'http://activitystrea.ms/schema/1.0/comment' ->
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with {:ok, activity} <- NoteHandler.handle_note(entry, doc), do: activity
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_ ->
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Logger.error("Couldn't parse incoming document")
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nil
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end
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end
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end)
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{:ok, activities}
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end
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def make_share(entry, doc, retweeted_activity) do
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with {:ok, actor} <- find_make_or_update_user(doc),
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%Object{} = object <- Object.get_by_ap_id(retweeted_activity.data["object"]["id"]),
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id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
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{:ok, activity, _object} = ActivityPub.announce(actor, object, id, false) do
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{:ok, activity}
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end
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end
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def handle_share(entry, doc) do
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with {:ok, retweeted_activity} <- get_or_build_object(entry),
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{:ok, activity} <- make_share(entry, doc, retweeted_activity) do
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{:ok, activity, retweeted_activity}
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else
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e -> {:error, e}
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end
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end
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def make_favorite(entry, doc, favorited_activity) do
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with {:ok, actor} <- find_make_or_update_user(doc),
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%Object{} = object <- Object.get_by_ap_id(favorited_activity.data["object"]["id"]),
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id when not is_nil(id) <- string_from_xpath("/entry/id", entry),
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{:ok, activity, _object} = ActivityPub.like(actor, object, id, false) do
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{:ok, activity}
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end
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end
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def get_or_build_object(entry) do
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with {:ok, activity} <- get_or_try_fetching(entry) do
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{:ok, activity}
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else
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_e ->
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with [object] <- :xmerl_xpath.string('/entry/activity:object', entry) do
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NoteHandler.handle_note(object, object)
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end
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end
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end
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def get_or_try_fetching(entry) do
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Logger.debug("Trying to get entry from db")
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with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry),
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%Activity{} = activity <- Activity.get_create_activity_by_object_ap_id(id) do
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{:ok, activity}
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else e ->
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Logger.debug("Couldn't get, will try to fetch")
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with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry),
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{:ok, [favorited_activity]} <- fetch_activity_from_html_url(href) do
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{:ok, favorited_activity}
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else e -> Logger.debug("Couldn't find href: #{inspect(e)}")
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end
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end
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end
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def handle_favorite(entry, doc) do
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with {:ok, favorited_activity} <- get_or_try_fetching(entry),
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{:ok, activity} <- make_favorite(entry, doc, favorited_activity) do
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{:ok, activity, favorited_activity}
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else
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e -> {:error, e}
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end
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end
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def get_attachments(entry) do
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:xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry)
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|> Enum.map(fn (enclosure) ->
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with href when not is_nil(href) <- string_from_xpath("/link/@href", enclosure),
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type when not is_nil(type) <- string_from_xpath("/link/@type", enclosure) do
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%{
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"type" => "Attachment",
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"url" => [%{
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"type" => "Link",
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"mediaType" => type,
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"href" => href
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}]
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}
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end
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end)
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|> Enum.filter(&(&1))
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end
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@doc """
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Gets the content from a an entry. Will add the cw text to the body for cw'd
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Mastodon notes.
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"""
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def get_content(entry) do
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base_content = string_from_xpath("//content", entry)
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with scope when not is_nil(scope) <- string_from_xpath("//mastodon:scope", entry),
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cw when not is_nil(cw) <- string_from_xpath("/*/summary", entry) do
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"<span class='mastodon-cw'>#{cw}</span><br>#{base_content}"
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else _e -> base_content
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end
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end
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def get_tags(entry) do
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:xmerl_xpath.string('//category', entry)
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|> Enum.map(fn (category) -> string_from_xpath("/category/@term", category) |> String.downcase end)
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end
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def maybe_update(doc, user) do
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old_data = %{
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avatar: user.avatar,
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bio: user.bio,
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name: user.name
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}
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with false <- user.local,
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avatar <- make_avatar_object(doc),
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bio when not is_nil(bio) <- string_from_xpath("//author[1]/summary", doc),
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name when not is_nil(name) <- string_from_xpath("//author[1]/poco:displayName", doc),
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new_data <- %{avatar: avatar, name: name, bio: bio},
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false <- new_data == old_data do
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change = Ecto.Changeset.change(user, new_data)
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Repo.update(change)
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else e ->
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{:ok, user}
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end
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end
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def find_make_or_update_user(doc) do
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uri = string_from_xpath("//author/uri[1]", doc)
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with {:ok, user} <- find_or_make_user(uri) do
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maybe_update(doc, user)
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end
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end
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def find_or_make_user(uri) do
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query = from user in User,
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where: user.ap_id == ^uri
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user = Repo.one(query)
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if is_nil(user) do
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make_user(uri)
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else
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{:ok, user}
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end
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end
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def make_user(uri) do
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with {:ok, info} <- gather_user_info(uri) do
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data = %{
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name: info["name"],
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nickname: info["nickname"] <> "@" <> info["host"],
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ap_id: info["uri"],
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info: info,
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avatar: info["avatar"],
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bio: info["bio"]
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}
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with %User{} = user <- User.get_by_ap_id(data.ap_id) do
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{:ok, user}
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else _e ->
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cs = User.remote_user_creation(data)
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Repo.insert(cs)
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end
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end
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end
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# TODO: Just takes the first one for now.
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def make_avatar_object(author_doc) do
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href = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@href", author_doc)
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type = string_from_xpath("//author[1]/link[@rel=\"avatar\"]/@type", author_doc)
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if href do
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%{
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"type" => "Image",
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"url" =>
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[%{
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"type" => "Link",
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"mediaType" => type,
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"href" => href
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}]
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}
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else
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nil
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end
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end
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def gather_user_info(username) do
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with {:ok, webfinger_data} <- WebFinger.finger(username),
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{:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do
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{:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)}
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else e ->
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Logger.debug(fn -> "Couldn't gather info for #{username}" end)
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{:error, e}
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end
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end
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# Regex-based 'parsing' so we don't have to pull in a full html parser
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# It's a hack anyway. Maybe revisit this in the future
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@mastodon_regex ~r/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
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@gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
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@gs_classic_regex ~r/<link rel="alternate" href="(.*)" type="application\/atom\+xml" title=.*>/
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def get_atom_url(body) do
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cond do
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Regex.match?(@mastodon_regex, body) ->
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[[_, match]] = Regex.scan(@mastodon_regex, body)
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{:ok, match}
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Regex.match?(@gs_regex, body) ->
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[[_, match]] = Regex.scan(@gs_regex, body)
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{:ok, match}
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Regex.match?(@gs_classic_regex, body) ->
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[[_, match]] = Regex.scan(@gs_classic_regex, body)
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{:ok, match}
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true ->
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Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end)
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{:error, "Couldn't find the atom link"}
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end
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end
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def fetch_activity_from_html_url(url) do
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Logger.debug("Trying to fetch #{url}")
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with {:ok, %{body: body}} <- @httpoison.get(url, [], follow_redirect: true, timeout: 10000, recv_timeout: 20000),
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{:ok, atom_url} <- get_atom_url(body),
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{:ok, %{status_code: code, body: body}} when code in 200..299 <- @httpoison.get(atom_url, [], follow_redirect: true, timeout: 10000, recv_timeout: 20000) do
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Logger.debug("Got document from #{url}, handling...")
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handle_incoming(body)
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else e -> Logger.debug("Couldn't get #{url}: #{inspect(e)}")
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end
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end
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end
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