defmodule Pleroma.Web.WebFinger do @httpoison Application.get_env(:pleroma, :httpoison) alias Pleroma.{Repo, User, XmlBuilder} alias Pleroma.Web alias Pleroma.Web.{XML, Salmon, OStatus} require Logger def host_meta do base_url = Web.base_url { :XRD, %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"}, { :Link, %{rel: "lrdd", type: "application/xrd+xml", template: "#{base_url}/.well-known/webfinger?resource={uri}"} } } |> XmlBuilder.to_doc end def webfinger(resource) do host = Pleroma.Web.Endpoint.host regex = ~r/(acct:)?(?\w+)@#{host}/ with %{"username" => username} <- Regex.named_captures(regex, resource) do user = User.get_by_nickname(username) {:ok, represent_user(user)} else _e -> with user when not is_nil(user) <- User.get_cached_by_ap_id(resource) do {:ok, represent_user(user)} else _e -> {:error, "Couldn't find user"} end end end def represent_user(user) do {:ok, user} = ensure_keys_present(user) {:ok, _private, public} = Salmon.keys_from_pem(user.info["keys"]) magic_key = Salmon.encode_key(public) { :XRD, %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"}, [ {:Subject, "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host}"}, {:Alias, user.ap_id}, {:Link, %{rel: "http://schemas.google.com/g/2010#updates-from", type: "application/atom+xml", href: OStatus.feed_path(user)}}, {:Link, %{rel: "http://webfinger.net/rel/profile-page", type: "text/html", href: user.ap_id}}, {:Link, %{rel: "salmon", href: OStatus.salmon_path(user)}}, {:Link, %{rel: "magic-public-key", href: "data:application/magic-public-key,#{magic_key}"}} ] } |> XmlBuilder.to_doc end # This seems a better fit in Salmon def ensure_keys_present(user) do info = user.info || %{} if info["keys"] do {:ok, user} else {:ok, pem} = Salmon.generate_rsa_pem info = Map.put(info, "keys", pem) Repo.update(Ecto.Changeset.change(user, info: info)) end end defp webfinger_from_xml(doc) do magic_key = XML.string_from_xpath(~s{//Link[@rel="magic-public-key"]/@href}, doc) "data:application/magic-public-key," <> magic_key = magic_key topic = XML.string_from_xpath(~s{//Link[@rel="http://schemas.google.com/g/2010#updates-from"]/@href}, doc) subject = XML.string_from_xpath("//Subject", doc) salmon = XML.string_from_xpath(~s{//Link[@rel="salmon"]/@href}, doc) data = %{ "magic_key" => magic_key, "topic" => topic, "subject" => subject, "salmon" => salmon } {:ok, data} end def get_template_from_xml(body) do xpath = "//Link[@rel='lrdd' and @type='application/xrd+xml']/@template" with doc when doc != :error <- XML.parse_document(body), template when template != nil <- XML.string_from_xpath(xpath, doc) do {:ok, template} end end def find_lrdd_template(domain) do with {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- @httpoison.get("http://#{domain}/.well-known/host-meta", [], follow_redirect: true) do get_template_from_xml(body) else _ -> with {:ok, %{body: body}} <- @httpoison.get("https://#{domain}/.well-known/host-meta", []) do get_template_from_xml(body) else e -> {:error, "Can't find lrdd template: #{inspect(e)}"} end end end def finger(account) do domain = with [_name, domain] <- String.split(account, "@") do domain else _e -> URI.parse(account).host end with {:ok, template} <- find_lrdd_template(domain), address <- String.replace(template, "{uri}", URI.encode(account)), response <- @httpoison.get(address, ["Accept": "application/xrd+xml"]), {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response, doc when doc != :error<- XML.parse_document(body), {:ok, data} <- webfinger_from_xml(doc) do {:ok, data} else e -> Logger.debug(fn -> "Couldn't finger #{account}." end) Logger.debug(fn -> inspect(e) end) {:error, e} end end end