defmodule Pleroma.Web.WebFinger do alias Pleroma.XmlBuilder alias Pleroma.{Repo, User} alias Pleroma.Web.{XML, Salmon, OStatus} require Logger def host_meta() do base_url = Pleroma.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.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.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: "salmon", href: OStatus.salmon_path(user)}}, {:Link, %{rel: "magic-public-key", href: "data:application/magic-public-key,#{magic_key}"}} ] } |> XmlBuilder.to_doc end 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 # FIXME: Make this call the host-meta to find the actual address. defp webfinger_address(domain) do "//#{domain}/.well-known/webfinger" 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 finger(account, getter \\ &HTTPoison.get/3) do domain = with [_name, domain] <- String.split(account, "@") do domain else _e -> URI.parse(account).host end address = webfinger_address(domain) # try https first response = with {:ok, result} <- getter.("https:" <> address, ["Accept": "application/xrd+xml"], [params: [resource: account]]) do {:ok, result} else _ -> getter.("http:" <> address, ["Accept": "application/xrd+xml"], [params: [resource: account]]) end with {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response, doc <- XML.parse_document(body), {:ok, data} <- webfinger_from_xml(doc) do {:ok, data} else e -> Logger.debug("Couldn't finger #{account}.") Logger.debug(inspect(e)) {:error, e} end end end