Removing workhorse_set_content_type feature flag

Removing workhorse_set_content_type feature flag introduced in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22667

app/helpers/blob_helper.rb

@@ -140,36 +140,6 @@ module BlobHelper
     Gitlab::Sanitizers::SVG.clean(data)
   end
 
-  # Remove once https://gitlab.com/gitlab-org/gitlab-ce/issues/36103 is closed
-  # and :workhorse_set_content_type flag is removed
-  # If we blindly set the 'real' content type when serving a Git blob we
-  # are enabling XSS attacks. An attacker could upload e.g. a Javascript
-  # file to a Git repository, trick the browser of a victim into
-  # downloading the blob, and then the 'application/javascript' content
-  # type would tell the browser to execute the attacker's Javascript. By
-  # overriding the content type and setting it to 'text/plain' (in the
-  # example of Javascript) we tell the browser of the victim not to
-  # execute untrusted data.
-  def safe_content_type(blob)
-    if blob.extension == 'svg'
-      blob.mime_type
-    elsif blob.text?
-      'text/plain; charset=utf-8'
-    elsif blob.image?
-      blob.content_type
-    else
-      'application/octet-stream'
-    end
-  end
-
-  def content_disposition(blob, inline)
-    # Remove the following line when https://gitlab.com/gitlab-org/gitlab-ce/issues/36103
-    # is closed and :workhorse_set_content_type flag is removed
-    return 'attachment' if blob.extension == 'svg'
-
-    inline ? 'inline' : 'attachment'
-  end
-
   def ref_project
     @ref_project ||= @target_project || @project
   end

app/helpers/workhorse_helper.rb

@@ -7,8 +7,7 @@ module WorkhorseHelper
   def send_git_blob(repository, blob, inline: true)
     headers.store(*Gitlab::Workhorse.send_git_blob(repository, blob))
 
-    headers['Content-Disposition'] = content_disposition(blob, inline)
-    headers['Content-Type'] = safe_content_type(blob)
+    headers['Content-Disposition'] = inline ? 'inline' : 'attachment'
 
     # If enabled, this will override the values set above
     workhorse_set_content_type!
@@ -47,6 +46,6 @@ module WorkhorseHelper
   end
 
   def workhorse_set_content_type!
-    headers[Gitlab::Workhorse::DETECT_HEADER] = "true" if Feature.enabled?(:workhorse_set_content_type)
+    headers[Gitlab::Workhorse::DETECT_HEADER] = "true"
   end
 end

spec/controllers/projects/avatars_controller_spec.rb

@@ -26,40 +26,16 @@ describe Projects::AvatarsController do
       context 'when the avatar is stored in the repository' do
         let(:filepath) { 'files/images/logo-white.png' }
 
-        context 'when feature flag workhorse_set_content_type is' do
-          before do
-            stub_feature_flags(workhorse_set_content_type: flag_value)
-          end
-
-          context 'enabled' do
-            let(:flag_value) { true }
-
         it 'sends the avatar' do
           subject
 
           expect(response).to have_gitlab_http_status(200)
           expect(response.header['Content-Disposition']).to eq('inline')
-              expect(response.header['Content-Type']).to eq 'image/png'
           expect(response.header[Gitlab::Workhorse::SEND_DATA_HEADER]).to start_with('git-blob:')
           expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to eq "true"
         end
       end
 
-          context 'disabled' do
-            let(:flag_value) { false }
-
-            it 'sends the avatar' do
-              subject
-
-              expect(response).to have_gitlab_http_status(200)
-              expect(response.header['Content-Type']).to eq('image/png')
-              expect(response.header[Gitlab::Workhorse::SEND_DATA_HEADER]).to start_with('git-blob:')
-              expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to eq nil
-            end
-          end
-        end
-      end
-
       context 'when the avatar is stored in lfs' do
         it_behaves_like 'repository lfs file load' do
           let(:filename) { 'lfs_object.iso' }

spec/controllers/projects/jobs_controller_spec.rb

@@ -892,14 +892,6 @@ describe Projects::JobsController, :clean_gitlab_redis_shared_state do
     context "when job has a trace artifact" do
       let(:job) { create(:ci_build, :trace_artifact, pipeline: pipeline) }
 
-      context 'when feature flag workhorse_set_content_type is' do
-        before do
-          stub_feature_flags(workhorse_set_content_type: flag_value)
-        end
-
-        context 'enabled' do
-          let(:flag_value) { true }
-
       it "sets #{Gitlab::Workhorse::DETECT_HEADER} header" do
         response = subject
 
@@ -910,21 +902,6 @@ describe Projects::JobsController, :clean_gitlab_redis_shared_state do
       end
     end
 
-        context 'disabled' do
-          let(:flag_value) { false }
-
-          it 'returns a trace' do
-            response = subject
-
-            expect(response).to have_gitlab_http_status(:ok)
-            expect(response.headers["Content-Type"]).to eq("text/plain; charset=utf-8")
-            expect(response.body).to eq(job.job_artifacts_trace.open.read)
-            expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to be nil
-          end
-        end
-      end
-    end
-
     context "when job has a trace file" do
       let(:job) { create(:ci_build, :trace_live, pipeline: pipeline) }
 

spec/controllers/projects/raw_controller_spec.rb

@@ -16,17 +16,9 @@ describe Projects::RawController do
     context 'regular filename' do
       let(:filepath) { 'master/README.md' }
 
-      context 'when feature flag workhorse_set_content_type is' do
-        before do
-          stub_feature_flags(workhorse_set_content_type: flag_value)
-
+      it 'delivers ASCII file' do
         subject
-        end
-
-        context 'enabled' do
-          let(:flag_value) { true }
 
-          it 'delivers ASCII file' do
         expect(response).to have_gitlab_http_status(200)
         expect(response.header['Content-Type']).to eq('text/plain; charset=utf-8')
         expect(response.header['Content-Disposition']).to eq('inline')
@@ -35,58 +27,19 @@ describe Projects::RawController do
       end
     end
 
-        context 'disabled' do
-          let(:flag_value) { false }
-
-          it 'delivers ASCII file' do
-            expect(response).to have_gitlab_http_status(200)
-            expect(response.header['Content-Type']).to eq('text/plain; charset=utf-8')
-            expect(response.header['Content-Disposition']).to eq('inline')
-            expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to eq nil
-            expect(response.header[Gitlab::Workhorse::SEND_DATA_HEADER]).to start_with('git-blob:')
-          end
-        end
-      end
-    end
-
     context 'image header' do
       let(:filepath) { 'master/files/images/6049019_460s.jpg' }
 
-      context 'when feature flag workhorse_set_content_type is' do
-        before do
-          stub_feature_flags(workhorse_set_content_type: flag_value)
-        end
-
-        context 'enabled' do
-          let(:flag_value) { true }
-
       it 'leaves image content disposition' do
         subject
 
         expect(response).to have_gitlab_http_status(200)
-            expect(response.header['Content-Type']).to eq('image/jpeg')
         expect(response.header['Content-Disposition']).to eq('inline')
         expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to eq "true"
         expect(response.header[Gitlab::Workhorse::SEND_DATA_HEADER]).to start_with('git-blob:')
       end
     end
 
-        context 'disabled' do
-          let(:flag_value) { false }
-
-          it 'sets image content type header' do
-            subject
-
-            expect(response).to have_gitlab_http_status(200)
-            expect(response.header['Content-Type']).to eq('image/jpeg')
-            expect(response.header['Content-Disposition']).to eq('inline')
-            expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to eq nil
-            expect(response.header[Gitlab::Workhorse::SEND_DATA_HEADER]).to start_with('git-blob:')
-          end
-        end
-      end
-    end
-
     it_behaves_like 'repository lfs file load' do
       let(:filename) { 'lfs_object.iso' }
       let(:filepath) { "be93687/files/lfs/#{filename}" }

spec/controllers/projects/wikis_controller_spec.rb

@@ -52,23 +52,14 @@ describe Projects::WikisController do
 
       let(:path) { upload_file_to_wiki(project, user, file_name) }
 
-      subject { get :show, params: { namespace_id: project.namespace, project_id: project, id: path } }
-
-      context 'when file is an image' do
-        let(:file_name) { 'dk.png' }
-
-        context 'when feature flag workhorse_set_content_type is' do
       before do
-            stub_feature_flags(workhorse_set_content_type: flag_value)
-
-            subject
+        get :show, params: { namespace_id: project.namespace, project_id: project, id: path }
       end
 
-          context 'enabled' do
-            let(:flag_value) { true }
+      context 'when file is an image' do
+        let(:file_name) { 'dk.png' }
 
         it 'delivers the image' do
-              expect(response.headers['Content-Type']).to eq('image/png')
           expect(response.headers['Content-Disposition']).to match(/^inline/)
           expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq "true"
         end
@@ -77,31 +68,8 @@ describe Projects::WikisController do
           let(:file_name) { 'unsanitized.svg' }
 
           it 'delivers the image' do
-                expect(response.headers['Content-Type']).to eq('image/svg+xml')
-                expect(response.headers['Content-Disposition']).to match(/^attachment/)
-                expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq "true"
-              end
-            end
-          end
-
-          context 'disabled' do
-            let(:flag_value) { false }
-
-            it 'renders the content inline' do
-              expect(response.headers['Content-Type']).to eq('image/png')
             expect(response.headers['Content-Disposition']).to match(/^inline/)
-              expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq nil
-            end
-
-            context 'when file is a svg' do
-              let(:file_name) { 'unsanitized.svg' }
-
-              it 'renders the content as an attachment' do
-                expect(response.headers['Content-Type']).to eq('image/svg+xml')
-                expect(response.headers['Content-Disposition']).to match(/^attachment/)
-                expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq nil
-              end
-            end
+            expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq "true"
           end
         end
       end
@@ -109,34 +77,11 @@ describe Projects::WikisController do
       context 'when file is a pdf' do
         let(:file_name) { 'git-cheat-sheet.pdf' }
 
-        context 'when feature flag workhorse_set_content_type is' do
-          before do
-            stub_feature_flags(workhorse_set_content_type: flag_value)
-
-            subject
-          end
-
-          context 'enabled' do
-            let(:flag_value) { true }
-
         it 'sets the content type to sets the content response headers' do
-              expect(response.headers['Content-Type']).to eq 'application/octet-stream'
           expect(response.headers['Content-Disposition']).to match(/^inline/)
           expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq "true"
         end
       end
-
-          context 'disabled' do
-            let(:flag_value) { false }
-
-            it 'sets the content response headers' do
-              expect(response.headers['Content-Type']).to eq 'application/octet-stream'
-              expect(response.headers['Content-Disposition']).to match(/^inline/)
-              expect(response.headers[Gitlab::Workhorse::DETECT_HEADER]).to eq nil
-            end
-          end
-        end
-      end
     end
   end
 

spec/controllers/snippets_controller_spec.rb

@@ -437,10 +437,7 @@ describe SnippetsController do
         end
 
         context 'when signed in user is the author' do
-          let(:flag_value) { false }
-
           before do
-            stub_feature_flags(workhorse_set_content_type: flag_value)
             get :raw, params: { id: personal_snippet.to_param }
           end
 
@@ -455,24 +452,11 @@ describe SnippetsController do
             expect(response.header['Content-Disposition']).to match(/inline/)
           end
 
-          context 'when feature flag workhorse_set_content_type is' do
-            context 'enabled' do
-              let(:flag_value) { true }
-
           it "sets #{Gitlab::Workhorse::DETECT_HEADER} header" do
             expect(response).to have_gitlab_http_status(200)
             expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to eq "true"
           end
         end
-
-            context 'disabled' do
-              it "does not set #{Gitlab::Workhorse::DETECT_HEADER} header" do
-                expect(response).to have_gitlab_http_status(200)
-                expect(response.header[Gitlab::Workhorse::DETECT_HEADER]).to be nil
-              end
-            end
-          end
-        end
       end
 
       context 'when not signed in' do