Merge branch '42031-fix-links-to-uploads-in-wikis' into 'master'

Resolve "Wiki uploaded files are missing"

Closes #42031

See merge request gitlab-org/gitlab-ce!16499

(cherry picked from commit 79b05cdd469726582e916cb606ba14b440a59011)

31e59219 Fix links to uploaded files on wiki pages

3 files changed, 17 insertions, 0 deletions

diff --git a/changelogs/unreleased/42031-fix-links-to-uploads-in-wikis.yml b/changelogs/unreleased/42031-fix-links-to-uploads-in-wikis.yml
new file mode 100644
index 00000000000..027cb414f23
--- /dev/null
+++ b/changelogs/unreleased/42031-fix-links-to-uploads-in-wikis.yml
@@ -0,0 +1,5 @@
+---
+title: Fix links to uploaded files on wiki pages
+merge_request: 16499
+author:
+type: fixed
diff --git a/lib/banzai/filter/wiki_link_filter/rewriter.rb b/lib/banzai/filter/wiki_link_filter/rewriter.rb
index e7a1ec8457d..072d24e5a11 100644
--- a/lib/banzai/filter/wiki_link_filter/rewriter.rb
+++ b/lib/banzai/filter/wiki_link_filter/rewriter.rb
@@ -9,6 +9,10 @@ module Banzai
         end
 
         def apply_rules
+          # Special case: relative URLs beginning with `/uploads/` refer to
+          # user-uploaded files and will be handled elsewhere.
+          return @uri.to_s if @uri.relative? && @uri.path.starts_with?('/uploads/')
+
           apply_file_link_rules!
           apply_hierarchical_link_rules!
           apply_relative_link_rules!
diff --git a/spec/lib/banzai/filter/wiki_link_filter_spec.rb b/spec/lib/banzai/filter/wiki_link_filter_spec.rb
index 9596f004052..50d053011b3 100644
--- a/spec/lib/banzai/filter/wiki_link_filter_spec.rb
+++ b/spec/lib/banzai/filter/wiki_link_filter_spec.rb
@@ -10,15 +10,23 @@ describe Banzai::Filter::WikiLinkFilter do
 
   it "doesn't rewrite absolute links" do
     filtered_link = filter("<a href='http://example.com:8000/'>Link</a>", project_wiki: wiki).children[0]
+
     expect(filtered_link.attribute('href').value).to eq('http://example.com:8000/')
   end
 
+  it "doesn't rewrite links to project uploads" do
+    filtered_link = filter("<a href='/uploads/a.test'>Link</a>", project_wiki: wiki).children[0]
+
+    expect(filtered_link.attribute('href').value).to eq('/uploads/a.test')
+  end
+
   describe "invalid links" do
     invalid_links = ["http://:8080", "http://", "http://:8080/path"]
 
     invalid_links.each do |invalid_link|
       it "doesn't rewrite invalid invalid_links like #{invalid_link}" do
         filtered_link = filter("<a href='#{invalid_link}'>Link</a>", project_wiki: wiki).children[0]
+
         expect(filtered_link.attribute('href').value).to eq(invalid_link)
       end
     end