add tunable for streaming.

config/config.exs

@@ -109,6 +109,7 @@ config :pleroma, Pleroma.Uploaders.Local, uploads: "uploads"
 
 config :pleroma, Pleroma.Uploaders.S3,
   bucket: nil,
+  streaming_enabled: true,
   public_endpoint: "https://s3.amazonaws.com"
 
 config :pleroma, Pleroma.Uploaders.MDII,

lib/pleroma/uploaders/s3.ex

@@ -6,10 +6,12 @@ defmodule Pleroma.Uploaders.S3 do
   @behaviour Pleroma.Uploaders.Uploader
   require Logger
 
+  alias Pleroma.Config
+
   # 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__])
+    config = Config.get([__MODULE__])
     bucket = Keyword.fetch!(config, :bucket)
 
     bucket_with_namespace =
@@ -34,18 +36,28 @@ defmodule Pleroma.Uploaders.S3 do
   end
 
   def put_file(%Pleroma.Upload{} = upload) do
-    config = Pleroma.Config.get([__MODULE__])
+    config = Config.get([__MODULE__])
     bucket = Keyword.get(config, :bucket)
+    streaming = Keyword.get(config, :streaming_enabled)
 
     {:ok, file_data} = File.read(upload.tempfile)
 
     s3_name = strict_encode(upload.path)
 
     op =
-      ExAws.S3.put_object(bucket, s3_name, file_data, [
-        {:acl, :public_read},
-        {:content_type, upload.content_type}
-      ])
+      if streaming do
+        upload.tempfile
+        |> ExAws.S3.Upload.stream_file()
+        |> ExAws.S3.upload(bucket, s3_name, [
+          {:acl, :public_read},
+          {:content_type, upload.content_type}
+        ])
+      else
+        ExAws.S3.put_object(bucket, s3_name, file_data, [
+          {:acl, :public_read},
+          {:content_type, upload.content_type}
+        ])
+      end
 
     case ExAws.request(op) do
       {:ok, _} ->