Fix for #32595, users can view the blame or history of file with newlines in its filename.

changelogs/unreleased/32595-blame-or-history-newline-in-filename.yml

+---
+title: Users can view the blame or history of a file with newlines in its filename.
+merge_request: 17543
+author: Jesse Hall @jessehall3
+type: fixed

config/routes/repository.rb

@@ -34,7 +34,7 @@ scope format: false do
       # ref regex used in constraints. Regex verification now done in controller.
       get 'logs_tree/*path', action: :logs_tree, as: :logs_file, format: false, constraints: {
         id: /.*/,
-        path: /.*/
+        path: /[^\0]*/
       }
     end
   end

spec/routing/project_routing_spec.rb

@@ -276,6 +276,11 @@ describe 'project routing' do
       expect(get('/gitlab/gitlabhq/refs/feature%2B45/logs_tree/foo/bar/baz')).to route_to('projects/refs#logs_tree', namespace_id: 'gitlab', project_id: 'gitlabhq', id: 'feature+45', path: 'foo/bar/baz')
       expect(get('/gitlab/gitlabhq/refs/feature@45/logs_tree/foo/bar/baz')).to route_to('projects/refs#logs_tree', namespace_id: 'gitlab', project_id: 'gitlabhq', id: 'feature@45', path: 'foo/bar/baz')
       expect(get('/gitlab/gitlabhq/refs/stable/logs_tree/files.scss')).to route_to('projects/refs#logs_tree', namespace_id: 'gitlab', project_id: 'gitlabhq', id: 'stable', path: 'files.scss')
+      assert_routing({ path: "/gitlab/gitlabhq/refs/stable/logs_tree/new%0A%0Aline.txt",
+                       method: :get },
+                     { controller: 'projects/refs', action: 'logs_tree',
+                       namespace_id: 'gitlab', project_id: 'gitlabhq',
+                       id: "stable", path: "new\n\nline.txt" })
     end
   end