Replace whitespaces in wiki page attachments file names

app/services/wikis/create_attachment_service.rb

@@ -11,7 +11,7 @@ module Wikis
     def initialize(*args)
       super
 
-      @file_name = truncate_file_name(params[:file_name])
+      @file_name = clean_file_name(params[:file_name])
       @file_path = File.join(ATTACHMENT_PATH, SecureRandom.hex, @file_name) if @file_name
       @commit_message ||= "Upload attachment #{@file_name}"
       @branch_name ||= wiki.default_branch
@@ -23,8 +23,16 @@ module Wikis
 
     private
 
-    def truncate_file_name(file_name)
+    def clean_file_name(file_name)
       return unless file_name.present?
+
+      file_name = truncate_file_name(file_name)
+      # CommonMark does not allow Urls with whitespaces, so we have to replace them
+      # Using the same regex Carrierwave use to replace invalid characters
+      file_name.gsub(CarrierWave::SanitizedFile.sanitize_regexp, '_')
+    end
+
+    def truncate_file_name(file_name)
       return file_name if file_name.length <= MAX_FILENAME_LENGTH
 
       extension = File.extname(file_name)

changelogs/unreleased/fj-51194-fix-wiki-attachments-with-whitespaces.yml

+---
+title: Replace white spaces in wiki attachments file names
+merge_request: 21569
+author:
+type: fixed

spec/services/wikis/create_attachment_service_spec.rb

@@ -88,8 +88,30 @@ describe Wikis::CreateAttachmentService do
     end
   end
 
-  describe 'validations' do
+  describe '#parse_file_name' do
     context 'when file_name' do
+      context 'has white spaces' do
+        let(:file_name) { 'file with spaces' }
+
+        it "replaces all of them with '_'" do
+          result = service.execute
+
+          expect(result[:status]).to eq :success
+          expect(result[:result][:file_name]).to eq 'file_with_spaces'
+        end
+      end
+
+      context 'has other invalid characters' do
+        let(:file_name) { "file\twith\tinvalid chars" }
+
+        it "replaces all of them with '_'" do
+          result = service.execute
+
+          expect(result[:status]).to eq :success
+          expect(result[:result][:file_name]).to eq 'file_with_invalid_chars'
+        end
+      end
+
       context 'is not present' do
         let(:file_name) { nil }