Merge branch 'develop' into feature/activitypub

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

diff --git a/lib/pleroma/web/salmon/salmon.ex b/lib/pleroma/web/salmon/salmon.ex
index 777898cfa23bfe04227bda67997ca9db5ce7b45c..46ca645d1d37352c2d5545a44eca0751f23ee53d 100644 (file)
--- a/lib/pleroma/web/salmon/salmon.ex
+++ b/lib/pleroma/web/salmon/salmon.ex
@@ -1,6 +1,11 @@
 defmodule Pleroma.Web.Salmon do
+  @httpoison Application.get_env(:pleroma, :httpoison)
+
   use Bitwise
   alias Pleroma.Web.XML
+  alias Pleroma.Web.OStatus.ActivityRepresenter
+  alias Pleroma.User
+  require Logger
 
   def decode(salmon) do
     doc = XML.parse_document(salmon)
@@ -11,7 +16,6 @@ defmodule Pleroma.Web.Salmon do
     {:xmlObj, :string, encoding} = :xmerl_xpath.string('string(//me:encoding[1])', doc)
     {:xmlObj, :string, type} = :xmerl_xpath.string('string(//me:data[1]/@type)', doc)
 
-
     {:ok, data} = Base.url_decode64(to_string(data), ignore: :whitespace)
     {:ok, sig} = Base.url_decode64(to_string(sig), ignore: :whitespace)
     alg = to_string(alg)
@@ -21,16 +25,14 @@ defmodule Pleroma.Web.Salmon do
     [data, type, encoding, alg, sig]
   end
 
-  # TODO rewrite in with-stile
-  # Make it fetch the key from the saved user if there is one
   def fetch_magic_key(salmon) do
-    [data, _, _, _, _] = decode(salmon)
-    doc = XML.parse_document(data)
-    uri = XML.string_from_xpath("/entry/author[1]/uri", doc)
-
-    {:ok, info} = Pleroma.Web.OStatus.gather_user_info(uri)
-
-    info.magic_key
+    with [data, _, _, _, _] <- decode(salmon),
+         doc <- XML.parse_document(data),
+         uri when not is_nil(uri) <- XML.string_from_xpath("/entry/author[1]/uri", doc),
+         {:ok, public_key} <- User.get_public_key_for_ap_id(uri),
+         magic_key <- encode_key(public_key) do
+      {:ok, magic_key}
+    end
   end
 
   def decode_and_validate(magickey, salmon) do
@@ -59,7 +61,7 @@ defmodule Pleroma.Web.Salmon do
 
     [modulus, exponent] = magickey
     |> String.split(".")
-    |> Enum.map(&Base.url_decode64!/1)
+    |> Enum.map(fn (n) -> Base.url_decode64!(n, padding: false) end)
     |> Enum.map(make_integer)
 
     {:RSAPublicKey, modulus, exponent}
@@ -72,17 +74,30 @@ defmodule Pleroma.Web.Salmon do
     "RSA.#{modulus_enc}.#{exponent_enc}"
   end
 
-  def generate_rsa_pem do
-    port = Port.open({:spawn, "openssl genrsa"}, [:binary])
-    {:ok, pem} = receive do
-      {^port, {:data, pem}} -> {:ok, pem}
-    end
-    Port.close(port)
-    if Regex.match?(~r/RSA PRIVATE KEY/, pem) do
+  # Native generation of RSA keys is only available since OTP 20+ and in default build conditions
+  # We try at compile time to generate natively an RSA key otherwise we fallback on the old way.
+  try do
+    _ = :public_key.generate_key({:rsa, 2048, 65537})
+    def generate_rsa_pem do
+      key = :public_key.generate_key({:rsa, 2048, 65537})
+      entry = :public_key.pem_entry_encode(:RSAPrivateKey, key)
+      pem = :public_key.pem_encode([entry]) |> String.trim_trailing
       {:ok, pem}
-    else
-      :error
     end
+  rescue
+    _ ->
+      def generate_rsa_pem do
+        port = Port.open({:spawn, "openssl genrsa"}, [:binary])
+        {:ok, pem} = receive do
+          {^port, {:data, pem}} -> {:ok, pem}
+        end
+        Port.close(port)
+        if Regex.match?(~r/RSA PRIVATE KEY/, pem) do
+          {:ok, pem}
+        else
+          :error
+        end
+      end
   end
 
   def keys_from_pem(pem) do
@@ -102,8 +117,13 @@ defmodule Pleroma.Web.Salmon do
     |> Enum.map(&Base.url_encode64/1)
     |> Enum.join(".")
 
-    signature = :public_key.sign(signed_text, :sha256, private_key) |> to_string |> Base.url_encode64
-    doc_base64= doc |> Base.url_encode64
+    signature = signed_text
+    |> :public_key.sign(:sha256, private_key)
+    |> to_string
+    |> Base.url_encode64
+
+    doc_base64 = doc
+    |> Base.url_encode64
 
     # Don't need proper xml building, these strings are safe to leave unescaped
     salmon = """
@@ -118,4 +138,52 @@ defmodule Pleroma.Web.Salmon do
 
     {:ok, salmon}
   end
+
+  def remote_users(%{data: %{"to" => to} = data}) do
+    to = to ++ (data["cc"] || [])
+    to
+    |> Enum.map(fn(id) -> User.get_cached_by_ap_id(id) end)
+    |> Enum.filter(fn(user) -> user && !user.local end)
+  end
+
+  defp send_to_user(%{info: %{"salmon" => salmon}}, feed, poster) do
+    with {:ok, %{status_code: code}} <- poster.(salmon, feed, [{"Content-Type", "application/magic-envelope+xml"}], timeout: 10000, recv_timeout: 20000) do
+      Logger.debug(fn -> "Pushed to #{salmon}, code #{code}" end)
+    else
+      e -> Logger.debug(fn -> "Pushing salmon to #{salmon} failed, #{inspect(e)}" end)
+    end
+  end
+
+  defp send_to_user(_,_,_), do: nil
+
+  @supported_activities [
+    "Create",
+    "Follow",
+    "Like",
+    "Announce",
+    "Undo",
+    "Delete"
+  ]
+  def publish(user, activity, poster \\ &@httpoison.post/4)
+  def publish(%{info: %{"keys" => keys}} = user, %{data: %{"type" => type}} = activity, poster) when type in @supported_activities do
+    feed = ActivityRepresenter.to_simple_form(activity, user, true)
+    |> ActivityRepresenter.wrap_with_entry
+    |> :xmerl.export_simple(:xmerl_xml)
+    |> to_string
+
+    if feed do
+      {:ok, private, _} = keys_from_pem(keys)
+      {:ok, feed} = encode(private, feed)
+
+      remote_users(activity)
+      |> Enum.each(fn(remote_user) ->
+        Task.start(fn ->
+          Logger.debug(fn -> "sending salmon to #{remote_user.ap_id}" end)
+          send_to_user(remote_user, feed, poster)
+        end)
+      end)
+    end
+  end
+
+  def publish(%{id: id}, _, _), do: Logger.debug(fn -> "Keys missing for user #{id}" end)
 end