Add content-type and filename params for file upload

lib/rocket_chat/messages/room.rb

@@ -347,7 +347,15 @@ def validate_attribute(attribute)
 
       def file_upload_hash(**params)
         permited_keys_for_file_upload = %i[file msg description tmid]
-        Util.slice_hash(params, *permited_keys_for_file_upload)
+        hash = Util.slice_hash(params, *permited_keys_for_file_upload)
+
+        # NOTE: https://www.rubydoc.info/github/ruby/ruby/Net/HTTPHeader:set_form
+        file_options = params.slice(:filename, :content_type).compact
+        hash.map do |key, value|
+          next [key, value] unless key == :file && file_options.keys.any?
+
+          [key, value, file_options]
+        end
       end
     end
   end

spec/shared/room_behaviors.rb

@@ -724,6 +724,21 @@
       it { expect(upload).to be_a(RocketChat::Message) }
     end
 
+    context 'with content_type params' do
+      subject(:upload) { scope.upload_file(room_id: room_id, file: file, content_type: content_type, **rest_params) }
+
+      let(:content_type) { 'image/png' }
+      let(:file) { File.open('spec/fixtures/files/image.png') }
+      let(:response) { png_upload_response(room_id: room_id) }
+
+      before do
+        stub_authed_request(:post, path).to_return(body: response, status: 200)
+      end
+
+      it { expect { upload }.not_to raise_error }
+      it { expect(upload).to be_a(RocketChat::Message) }
+    end
+
     context 'when not accepted error is raised' do
       before do
         stub_authed_request(:post, path).to_return(body: response, status: 400)