defmodule Pleroma.Web.WebFinger do @httpoison Application.get_env(:pleroma, :httpoison) alias Pleroma.{User, XmlBuilder} alias Pleroma.Web alias Pleroma.Web.{XML, Salmon, OStatus} require Jason 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, fmt) when fmt in ["XML", "JSON"] do host = Pleroma.Web.Endpoint.host() regex = ~r/(acct:)?(?\w+)@#{host}/ with %{"username" => username} <- Regex.named_captures(regex, resource), %User{} = user <- User.get_by_nickname(username) do {:ok, represent_user(user, fmt)} else _e -> with %User{} = user <- User.get_cached_by_ap_id(resource) do {:ok, represent_user(user, fmt)} else _e -> {:error, "Couldn't find user"} end end end def represent_user(user, "JSON") do {:ok, user} = ensure_keys_present(user) {:ok, _private, public} = Salmon.keys_from_pem(user.info.keys) magic_key = Salmon.encode_key(public) %{ "subject" => "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}", "aliases" => [user.ap_id], "links" => [ %{ "rel" => "http://schemas.google.com/g/2010#updates-from", "type" => "application/atom+xml", "href" => OStatus.feed_path(user) }, %{ "rel" => "http://webfinger.net/rel/profile-page", "type" => "text/html", "href" => user.ap_id }, %{"rel" => "salmon", "href" => OStatus.salmon_path(user)}, %{ "rel" => "magic-public-key", "href" => "data:application/magic-public-key,#{magic_key}" }, %{"rel" => "self", "type" => "application/activity+json", "href" => user.ap_id}, %{ "rel" => "self", "type" => "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"", "href" => user.ap_id }, %{ "rel" => "http://ostatus.org/schema/1.0/subscribe", "template" => OStatus.remote_follow_path() } ] } end def represent_user(user, "XML") 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}"}}, {:Link, %{rel: "self", type: "application/activity+json", href: user.ap_id}}, {:Link, %{rel: "http://ostatus.org/schema/1.0/subscribe", template: OStatus.remote_follow_path()}} ] } |> 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_cng = info |> Pleroma.User.Info.set_keys(pem) cng = Ecto.Changeset.change(user) |> Ecto.Changeset.put_embed(:info, info_cng) User.update_and_set_cache(cng) end end defp get_magic_key(magic_key) do "data:application/magic-public-key," <> magic_key = magic_key {:ok, magic_key} rescue MatchError -> {:error, "Missing magic key data."} end defp webfinger_from_xml(doc) do with magic_key <- XML.string_from_xpath(~s{//Link[@rel="magic-public-key"]/@href}, doc), {:ok, magic_key} <- get_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), subscribe_address <- XML.string_from_xpath( ~s{//Link[@rel="http://ostatus.org/schema/1.0/subscribe"]/@template}, doc ), ap_id <- XML.string_from_xpath( ~s{//Link[@rel="self" and @type="application/activity+json"]/@href}, doc ) do data = %{ "magic_key" => magic_key, "topic" => topic, "subject" => subject, "salmon" => salmon, "subscribe_address" => subscribe_address, "ap_id" => ap_id } {:ok, data} else {:error, e} -> {:error, e} e -> {:error, e} end end defp webfinger_from_json(doc) do data = Enum.reduce(doc["links"], %{"subject" => doc["subject"]}, fn link, data -> case {link["type"], link["rel"]} do {"application/activity+json", "self"} -> Map.put(data, "ap_id", link["href"]) {"application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"", "self"} -> Map.put(data, "ap_id", link["href"]) {_, "magic-public-key"} -> "data:application/magic-public-key," <> magic_key = link["href"] Map.put(data, "magic_key", magic_key) {"application/atom+xml", "http://schemas.google.com/g/2010#updates-from"} -> Map.put(data, "topic", link["href"]) {_, "salmon"} -> Map.put(data, "salmon", link["href"]) {_, "http://ostatus.org/schema/1.0/subscribe"} -> Map.put(data, "subscribe_address", link["template"]) _ -> Logger.debug("Unhandled type: #{inspect(link["type"])}") data end end) {:ok, data} end def get_template_from_xml(body) do xpath = "//Link[@rel='lrdd']/@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 account = String.trim_leading(account, "@") domain = with [_name, domain] <- String.split(account, "@") do domain else _e -> URI.parse(account).host end address = case find_lrdd_template(domain) do {:ok, template} -> String.replace(template, "{uri}", URI.encode(account)) _ -> "https://#{domain}/.well-known/webfinger?resource=acct:#{account}" end with response <- @httpoison.get( address, [Accept: "application/xrd+xml,application/jrd+json"], follow_redirect: true ), {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response do doc = XML.parse_document(body) if doc != :error do webfinger_from_xml(doc) else with {:ok, doc} <- Jason.decode(body) do webfinger_from_json(doc) else {:error, e} -> e end end else e -> Logger.debug(fn -> "Couldn't finger #{account}" end) Logger.debug(fn -> inspect(e) end) {:error, e} end end end