Open WebIDE in fork when user doesn't have access

When opening the IDE on a project where the user doesn't have push
access, we create a fork and then redirect back to the IDE. To make
sure the user can actually commit, we need to open the IDE in the forked
project rather than the upstream project.

app/helpers/blob_helper.rb

@@ -18,7 +18,16 @@ module BlobHelper
   end
   def ide_edit_path(project = @project, ref = @ref, path = @path, options = {})
-    segments = [ide_path, 'project', project.full_path, 'edit', ref]
+    project_path =
+      if !current_user || can?(current_user, :push_code, project)
+        project.full_path
+      else
+        # We currently always fork to the user's namespace
+        # in edit_fork_button_tag
+        "#{current_user.namespace.full_path}/#{project.path}"
+      end
+
+    segments = [ide_path, 'project', project_path, 'edit', ref]
     segments.concat(['-', encode_ide_path(path)]) if path.present?
     File.join(segments)
   end

changelogs/unreleased/51952-redirect-to-webide-in-fork.yml

+---
+title: Open WebIDE in fork when user doesn't have access
+merge_request: 30642
+author:
+type: changed

spec/features/projects/files/user_edits_files_spec.rb

@@ -162,6 +162,7 @@ describe 'Projects > Files > User edits files', :js do
       expect_fork_status
+      expect(page).to have_css('.ide-sidebar-project-title', text: "#{project2.name} #{user.namespace.full_path}/#{project2.path}")
       expect(page).to have_css('.ide .multi-file-tab', text: '.gitignore')
     end

spec/helpers/blob_helper_spec.rb

@@ -29,14 +29,15 @@ describe BlobHelper do
     let(:project) { create(:project, :repository, namespace: namespace) }
     before do
-      allow(self).to receive(:current_user).and_return(nil)
-      allow(self).to receive(:can_collaborate_with_project?).and_return(true)
+      allow(helper).to receive(:current_user).and_return(nil)
+      allow(helper).to receive(:can?).and_return(true)
+      allow(helper).to receive(:can_collaborate_with_project?).and_return(true)
     end
     it 'verifies blob is text' do
       expect(helper).not_to receive(:blob_text_viewable?)
-      button = edit_blob_button(project, 'refs/heads/master', 'README.md')
+      button = helper.edit_blob_button(project, 'refs/heads/master', 'README.md')
       expect(button).to start_with('<button')
     end
@@ -46,25 +47,25 @@ describe BlobHelper do
       expect(project.repository).not_to receive(:blob_at)
-      edit_blob_button(project, 'refs/heads/master', 'README.md', blob: blob)
+      helper.edit_blob_button(project, 'refs/heads/master', 'README.md', blob: blob)
     end
     it 'returns a link with the proper route' do
       stub_feature_flags(web_ide_default: false)
-      link = edit_blob_button(project, 'master', 'README.md')
+      link = helper.edit_blob_button(project, 'master', 'README.md')
       expect(Capybara.string(link).find_link('Edit')[:href]).to eq("/#{project.full_path}/edit/master/README.md")
     end
     it 'returns a link with a Web IDE route' do
-      link = edit_blob_button(project, 'master', 'README.md')
+      link = helper.edit_blob_button(project, 'master', 'README.md')
       expect(Capybara.string(link).find_link('Edit')[:href]).to eq("/-/ide/project/#{project.full_path}/edit/master/-/README.md")
     end
     it 'returns a link with the passed link_opts on the expected route' do
       stub_feature_flags(web_ide_default: false)
-      link = edit_blob_button(project, 'master', 'README.md', link_opts: { mr_id: 10 })
+      link = helper.edit_blob_button(project, 'master', 'README.md', link_opts: { mr_id: 10 })
       expect(Capybara.string(link).find_link('Edit')[:href]).to eq("/#{project.full_path}/edit/master/README.md?mr_id=10")
     end
@@ -203,6 +204,13 @@ describe BlobHelper do
   describe '#ide_edit_path' do
     let(:project) { create(:project) }
+    let(:current_user) { create(:user) }
+    let(:can_push_code) { true }
+
+    before do
+      allow(helper).to receive(:current_user).and_return(current_user)
+      allow(helper).to receive(:can?).and_return(can_push_code)
+    end
     around do |example|
       old_script_name = Rails.application.routes.default_url_options[:script_name]
@@ -243,5 +251,21 @@ describe BlobHelper do
       expect(helper.ide_edit_path(project, "testing/slashes", "readme.md/")).to eq("/-/ide/project/#{project.namespace.path}/#{project.path}/edit/testing/slashes/-/readme.md/")
     end
+
+    context 'when user is not logged in' do
+      let(:current_user) { nil }
+
+      it 'returns IDE path inside the project' do
+        expect(helper.ide_edit_path(project, "master", "")).to eq("/-/ide/project/#{project.namespace.path}/#{project.path}/edit/master")
+      end
+    end
+
+    context 'when user cannot push to the project' do
+      let(:can_push_code) { false }
+
+      it "returns IDE path with the user's fork" do
+        expect(helper.ide_edit_path(project, "master", "")).to eq("/-/ide/project/#{current_user.namespace.full_path}/#{project.path}/edit/master")
+      end
+    end
   end
 end