Access uploaded files via env.params.files.

Kemal parses the body and makes uploaded files available when
accessing `params`. There's no need to independently parse the form
data.

Remove a check for the upload request path that served as a guard
against invoking `params`, which then made it impossible to access and
parse the form data.

src/controllers/uploads.cr

@@ -8,7 +8,7 @@ class UploadsController
   post "/uploads" do |env|
     filename = nil
     filepath = nil
-    HTTP::FormData.parse(env.request) do |part|
+    env.params.files.each do |name, part|
       if part.filename.presence
         filename = env.account.actor.id.to_s
         filepath = File.join("uploads", *Tuple(String, String, String).from(UUID.random.to_s.split("-")[0..2]))
@@ -17,9 +17,7 @@ class UploadsController
           filename = "#{filename}#{extension}"
         end
         Dir.mkdir_p(File.join(Kemal.config.public_folder, filepath))
-        File.open(File.join(Kemal.config.public_folder, filepath, filename), "w") do |file|
-          IO.copy(part.body, file)
-        end
+        part.tempfile.rename(File.join(Kemal.config.public_folder, filepath, filename))
       end
     end
     if filename && filepath

src/framework/method.cr

@@ -18,7 +18,7 @@ module Ktistec
       # "application/x-www-form-urlencoded" on activities. see:
       # https://github.com/pixelfed/pixelfed/issues/3049
       return call_next env unless env.request.method == "POST"
-      return call_next env if env.request.path == "/uploads" || env.request.path.ends_with?("/inbox")
+      return call_next env if env.request.path.ends_with?("/inbox")
       return call_next env unless env.params.body["_method"]? == "delete"
 
       # switch method and fix URL params