git.squeep.com Git - akkoma/blob - lib/pleroma/web/web_finger/web_finger.ex

   1 defmodule Pleroma.Web.WebFinger do
   2   alias Pleroma.XmlBuilder
   3   alias Pleroma.User
   4   alias Pleroma.Web.OStatus
   5   alias Pleroma.Web.XML
   6   require Logger
   7
   8   def host_meta() do
   9     base_url  = Pleroma.Web.base_url
  10     {
  11       :XRD, %{ xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0" },
  12       {
  13         :Link, %{ rel: "lrdd", type: "application/xrd+xml", template: "#{base_url}/.well-known/webfinger?resource={uri}"  }
  14       }
  15     }
  16     |> XmlBuilder.to_doc
  17   end
  18
  19   def webfinger(resource) do
  20     host = Pleroma.Web.host
  21     regex = ~r/acct:(?<username>\w+)@#{host}/
  22     case Regex.named_captures(regex, resource) do
  23       %{"username" => username} ->
  24         user = User.get_cached_by_nickname(username)
  25         {:ok, represent_user(user)}
  26       _ -> nil
  27     end
  28   end
  29
  30   def represent_user(user) do
  31     {
  32       :XRD, %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
  33       [
  34         {:Subject, "acct:#{user.nickname}@#{Pleroma.Web.host}"},
  35         {:Alias, user.ap_id},
  36         {:Link, %{rel: "http://schemas.google.com/g/2010#updates-from", type: "application/atom+xml", href: OStatus.feed_path(user)}},
  37         {:Link, %{rel: "salmon", href: OStatus.salmon_path(user)}}
  38       ]
  39     }
  40     |> XmlBuilder.to_doc
  41   end
  42
  43   # FIXME: Make this call the host-meta to find the actual address.
  44   defp webfinger_address(domain) do
  45     "https://#{domain}/.well-known/webfinger"
  46   end
  47
  48   defp webfinger_from_xml(doc) do
  49     magic_key = XML.string_from_xpath(~s{//Link[@rel="magic-public-key"]/@href}, doc)
  50     "data:application/magic-public-key," <> magic_key = magic_key
  51     topic = XML.string_from_xpath(~s{//Link[@rel="http://schemas.google.com/g/2010#updates-from"]/@href}, doc)
  52     subject = XML.string_from_xpath("//Subject", doc)
  53     salmon = XML.string_from_xpath(~s{//Link[@rel="salmon"]/@href}, doc)
  54     data = %{
  55       magic_key: magic_key,
  56       topic: topic,
  57       subject: subject,
  58       salmon: salmon
  59     }
  60     {:ok, data}
  61   end
  62
  63   def finger(account, getter \\ &HTTPoison.get/3) do
  64     [name, domain] = String.split(account, "@")
  65     address = webfinger_address(domain)
  66     with {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- getter.(address, ["Accept": "application/xrd+xml"], [params: [resource: account]]),
  67          doc <- XML.parse_document(body),
  68          {:ok, data} <- webfinger_from_xml(doc) do
  69       {:ok, data}
  70     else
  71       e ->
  72         Logger.debug("Couldn't finger #{account}.")
  73         Logger.debug(e)
  74         {:error, e}
  75     end
  76   end
  77 end