2 files changed, 42 insertions, 5 deletions
diff --git a/lib/pleroma/uploaders/s3.ex b/lib/pleroma/uploaders/s3.ex
index 108cf06b5..fbd89616c 100644
--- a/lib/pleroma/uploaders/s3.ex
+++ b/lib/pleroma/uploaders/s3.ex
@@ -9,12 +9,20 @@ defmodule Pleroma.Uploaders.S3 do
   # The file name is re-encoded with S3's constraints here to comply with previous links with less strict filenames
   def get_file(file) do
     config = Pleroma.Config.get([__MODULE__])
+    bucket = Keyword.fetch!(config, :bucket)
+
+    bucket_with_namespace =
+      if namespace = Keyword.get(config, :bucket_namespace) do
+        namespace <> ":" <> bucket
+      else
+        bucket
+      end
 
     {:ok,
      {:url,
       Path.join([
         Keyword.fetch!(config, :public_endpoint),
-        Keyword.fetch!(config, :bucket),
+        bucket_with_namespace,
         strict_encode(URI.decode(file))
       ])}}
   end
diff --git a/lib/pleroma/uploaders/uploader.ex b/lib/pleroma/uploaders/uploader.ex
index 0959d7a3e..ce83cbbbc 100644
--- a/lib/pleroma/uploaders/uploader.ex
+++ b/lib/pleroma/uploaders/uploader.ex
@@ -27,18 +27,47 @@ defmodule Pleroma.Uploaders.Uploader do
     This allows to correctly proxy or redirect requests to the backend, while allowing to migrate backends without breaking any URL.
   * `{url, url :: String.t}` to bypass `get_file/2` and use the `url` directly in the activity.
   * `{:error, String.t}` error information if the file failed to be saved to the backend.
+  * `:wait_callback` will wait for an http post request at `/api/pleroma/upload_callback/:upload_path` and call the uploader's `http_callback/3` method.
 
 
   """
+  @type file_spec :: {:file | :url, String.t()}
   @callback put_file(Pleroma.Upload.t()) ::
-              :ok | {:ok, {:file | :url, String.t()}} | {:error, String.t()}
+              :ok | {:ok, file_spec()} | {:error, String.t()} | :wait_callback
+
+  @callback http_callback(Plug.Conn.t(), Map.t()) ::
+              {:ok, Plug.Conn.t()}
+              | {:ok, Plug.Conn.t(), file_spec()}
+              | {:error, Plug.Conn.t(), String.t()}
+  @optional_callbacks http_callback: 2
+
+  @spec put_file(module(), Pleroma.Upload.t()) :: {:ok, file_spec()} | {:error, String.t()}
 
-  @spec put_file(module(), Pleroma.Upload.t()) ::
-          {:ok, {:file | :url, String.t()}} | {:error, String.t()}
   def put_file(uploader, upload) do
     case uploader.put_file(upload) do
       :ok -> {:ok, {:file, upload.path}}
-      other -> other
+      :wait_callback -> handle_callback(uploader, upload)
+      {:ok, _} = ok -> ok
+      {:error, _} = error -> error
+    end
+  end
+
+  defp handle_callback(uploader, upload) do
+    :global.register_name({__MODULE__, upload.path}, self())
+
+    receive do
+      {__MODULE__, pid, conn, params} ->
+        case uploader.http_callback(conn, params) do
+          {:ok, conn, ok} ->
+            send(pid, {__MODULE__, conn})
+            {:ok, ok}
+
+          {:error, conn, error} ->
+            send(pid, {__MODULE__, conn})
+            {:error, error}
+        end
+    after
+      30_000 -> {:error, "Uploader callback timeout"}
     end
   end
 end