- 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}
+ 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: status, body: body}} when status in 200..299 <-
+ HTTP.get("http://#{domain}/.well-known/host-meta", []) do
+ get_template_from_xml(body)
+ else
+ _ ->
+ with {:ok, %{body: body}} <- HTTP.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 <-
+ HTTP.get(
+ address,
+ Accept: "application/xrd+xml,application/jrd+json"
+ ),
+ {:ok, %{status: status, body: body}} when status 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