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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	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}
	alias Pleroma.Web.OStatus.{FollowHandler, UnfollowHandler, NoteHandler, DeleteHandler}
	alias Pleroma.Web.ActivityPub.Transmogrifier

	def is_representable?(%Activity{data: data}) do
	object = Object.normalize(data["object"])

	cond do
	is_nil(object) ->
	false

	object.data["type"] == "Note" ->
	true

	true ->
	false
	end
	end

	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 remote_follow_path do
	"#{Web.base_url()}/ostatus_subscribe?acct={uri}"
	end

	def handle_incoming(xml_string) do
	with doc when doc != :error <- parse_document(xml_string) do
	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)
	Logger.debug("Handling #{verb}")

	try do
	case verb do
	'http://activitystrea.ms/schema/1.0/delete' ->
	with {:ok, activity} <- DeleteHandler.handle_delete(entry, doc), do: activity

	'http://activitystrea.ms/schema/1.0/follow' ->
	with {:ok, activity} <- FollowHandler.handle(entry, doc), do: activity

	'http://activitystrea.ms/schema/1.0/unfollow' ->
	with {:ok, activity} <- UnfollowHandler.handle(entry, doc), do: activity

	'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} <- NoteHandler.handle_note(entry, doc), do: activity

	'http://activitystrea.ms/schema/1.0/comment' ->
	with {:ok, activity} <- NoteHandler.handle_note(entry, doc), do: activity

	_ ->
	Logger.error("Couldn't parse incoming document")
	nil
	end
	end
	rescue
	e ->
	Logger.error("Error occured while handling activity")
	Logger.error(xml_string)
	Logger.error(inspect(e))
	nil
	end
	end)
	\|> Enum.filter(& &1)

	{:ok, activities}
	else
	_e -> {:error, []}
	end
	end

	def make_share(entry, doc, retweeted_activity) do
	with {:ok, actor} <- find_make_or_update_user(doc),
	%Object{} = object <- Object.normalize(retweeted_activity.data["object"]),
	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 {:ok, retweeted_activity} <- get_or_build_object(entry),
	{: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.normalize(favorited_activity.data["object"]),
	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_build_object(entry) do
	with {:ok, activity} <- get_or_try_fetching(entry) do
	{:ok, activity}
	else
	_e ->
	with [object] <- :xmerl_xpath.string('/entry/activity:object', entry) do
	NoteHandler.handle_note(object, object)
	end
	end
	end

	def get_or_try_fetching(entry) do
	Logger.debug("Trying to get entry from db")

	with id when not is_nil(id) <- string_from_xpath("//activity:object[1]/id", entry),
	%Activity{} = activity <- Activity.get_create_by_object_ap_id(id) do
	{:ok, activity}
	else
	_ ->
	Logger.debug("Couldn't get, will try to fetch")

	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_url(href) do
	{:ok, favorited_activity}
	else
	e -> Logger.debug("Couldn't find href: #{inspect(e)}")
	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

	@doc """
	Gets the content from a an entry.
	"""
	def get_content(entry) do
	string_from_xpath("//content", entry)
	end

	@doc """
	Get the cw that mastodon uses.
	"""
	def get_cw(entry) do
	with cw when not is_nil(cw) <- string_from_xpath("/*/summary", entry) do
	cw
	else
	_e -> nil
	end
	end

	def get_tags(entry) do
	:xmerl_xpath.string('//category', entry)
	\|> Enum.map(fn category -> string_from_xpath("/category/@term", category) end)
	\|> Enum.filter(& &1)
	\|> Enum.map(&String.downcase/1)
	end

	def maybe_update(doc, user) do
	if "true" == string_from_xpath("//author[1]/ap_enabled", doc) do
	Transmogrifier.upgrade_user_from_ap_id(user.ap_id)
	else
	maybe_update_ostatus(doc, user)
	end
	end

	def maybe_update_ostatus(doc, user) do
	old_data = %{
	avatar: user.avatar,
	bio: user.bio,
	name: user.name
	}

	with false <- user.local,
	avatar <- make_avatar_object(doc),
	bio <- string_from_xpath("//author[1]/summary", doc),
	name <- string_from_xpath("//author[1]/poco:displayName", doc),
	new_data <- %{
	avatar: avatar \|\| old_data.avatar,
	name: name \|\| old_data.name,
	bio: bio \|\| old_data.bio
	},
	false <- new_data == old_data do
	change = Ecto.Changeset.change(user, new_data)
	User.update_and_set_cache(change)
	else
	_ ->
	{:ok, user}
	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
	maybe_update(doc, user)
	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, update \\ false) 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"],
	bio: info["bio"]
	}

	with false <- update,
	%User{} = user <- User.get_by_ap_id(data.ap_id) do
	{:ok, user}
	else
	_e -> User.insert_or_update_user(data)
	end
	end
	end

	# TODO: Just takes the first one for now.
	def make_avatar_object(author_doc, rel \\ "avatar") do
	href = string_from_xpath("//author[1]/link[@rel=\"#{rel}\"]/@href", author_doc)
	type = string_from_xpath("//author[1]/link[@rel=\"#{rel}\"]/@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/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
	@gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
	@gs_classic_regex ~r/<link rel="alternate" href="(.)" type="application\/atom\+xml" title=.>/
	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_atom_url(url) do
	with true <- String.starts_with?(url, "http"),
	{:ok, %{body: body, status: code}} when code in 200..299 <-
	@httpoison.get(
	url,
	[{:Accept, "application/atom+xml"}]
	) do
	Logger.debug("Got document from #{url}, handling...")
	handle_incoming(body)
	else
	e ->
	Logger.debug("Couldn't get #{url}: #{inspect(e)}")
	e
	end
	end

	def fetch_activity_from_html_url(url) do
	Logger.debug("Trying to fetch #{url}")

	with true <- String.starts_with?(url, "http"),
	{:ok, %{body: body}} <- @httpoison.get(url, []),
	{:ok, atom_url} <- get_atom_url(body) do
	fetch_activity_from_atom_url(atom_url)
	else
	e ->
	Logger.debug("Couldn't get #{url}: #{inspect(e)}")
	e
	end
	end

	def fetch_activity_from_url(url) do
	with {:ok, [_ \| _] = activities} <- fetch_activity_from_atom_url(url) do
	{:ok, activities}
	else
	_e -> fetch_activity_from_html_url(url)
	end
	rescue
	e ->
	Logger.debug("Couldn't get #{url}: #{inspect(e)}")
	{:error, "Couldn't get #{url}: #{inspect(e)}"}
	end
	end

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