+
+ # 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)
+ Ecto.Changeset.change(user, info: info)
+ |> User.update_and_set_cache()
+ 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)
+ 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)
+ data = %{
+ "magic_key" => magic_key,
+ "topic" => topic,
+ "subject" => subject,
+ "salmon" => salmon,
+ "subscribe_address" => subscribe_address,
+ "ap_id" => ap_id
+ }
+ {:ok, data}
+ end
+
+ # TODO: maybe fill in other details from JRD webfinger response
+ defp webfinger_from_json(doc) do
+ data = Enum.reduce(doc["links"], %{"subject" => doc["subject"]}, fn (link, data) ->
+ case link["type"] do
+ "application/activity+json" ->
+ Map.put(data, "ap_id", link["href"])
+ _ ->
+ Logger.debug("Unhandled type: #{inspect(link["type"])}")
+ end
+ end)
+ {: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
+ account = String.trim_leading(account, "@")
+ domain = with [_name, domain] <- String.split(account, "@") do
+ domain
+ else _e ->
+ URI.parse(account).host
+ end
+
+ case find_lrdd_template(domain) do
+ {:ok, template} ->
+ address = String.replace(template, "{uri}", URI.encode(account))
+ _ ->
+ address = "http://#{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
+ {:ok, doc} = Poison.decode(body)
+ webfinger_from_json(doc)
+ end
+ else
+ e ->
+ Logger.debug(fn -> "Couldn't finger #{account}" end)
+ Logger.debug(fn -> inspect(e) end)
+ {:error, e}
+ end
+ end