Merge branch 'develop' of git.pleroma.social:pleroma/pleroma into develop

[akkoma] / lib / pleroma / web / web_finger / web_finger.ex

diff --git a/lib/pleroma/web/web_finger/web_finger.ex b/lib/pleroma/web/web_finger/web_finger.ex
index 258ff76714b4ee94c3d4f4cb8d0be6a25ef0919e..95e717b17859086c3e2dddb7a7561718161e8424 100644 (file)
--- a/lib/pleroma/web/web_finger/web_finger.ex
+++ b/lib/pleroma/web/web_finger/web_finger.ex
@@ -1,38 +1,125 @@
 defmodule Pleroma.Web.WebFinger do
-  alias Pleroma.XmlBuilder
-  alias Pleroma.User
+  @httpoison Application.get_env(:pleroma, :httpoison)
 
-  def host_meta() do
-    base_url  = Pleroma.Web.base_url
+  alias Pleroma.{Repo, User, XmlBuilder}
+  alias Pleroma.Web
+  alias Pleroma.Web.{XML, Salmon, OStatus}
+  require Logger
+
+  def host_meta do
+    base_url  = Web.base_url
     {
-      :XRD, %{ xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0" },
+      :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}"  }
+        :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:(?<username>\w+)@#{host}/
-    case Regex.named_captures(regex, resource) do
-      %{"username" => username} ->
-        user = User.get_cached_by_nickname(username)
+    host = Pleroma.Web.Endpoint.host
+    regex = ~r/(acct:)?(?<username>\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)}
-      _ -> nil
+      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}"},
+        {: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: "#{user.ap_id}.atom"}}
+        {: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: "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 = Map.put(info, "keys", pem)
+      Repo.update(Ecto.Changeset.change(user, info: info))
+    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)
+    data = %{
+      "magic_key" => magic_key,
+      "topic" => topic,
+      "subject" => subject,
+      "salmon" => salmon,
+      "subscribe_address" => subscribe_address
+    }
+    {: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
+    domain = with [_name, domain] <- String.split(account, "@") do
+               domain
+             else _e ->
+               URI.parse(account).host
+             end
+
+    with {:ok, template} <- find_lrdd_template(domain),
+         address <- String.replace(template, "{uri}", URI.encode(account)),
+         response <- @httpoison.get(address, ["Accept": "application/xrd+xml"]),
+         {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response,
+         doc when doc != :error<- XML.parse_document(body),
+         {:ok, data} <- webfinger_from_xml(doc) do
+      {:ok, data}
+    else
+      e ->
+        Logger.debug(fn -> "Couldn't finger #{account}." end)
+        Logger.debug(fn -> inspect(e) end)
+        {:error, e}
+    end
+  end
 end