Implement support for CI variables of type file

Add env_var and file as supported types for CI variables. Variables of
type file expose to users existing gitlab-runner behaviour - save
variable value into a temp file and set the path to this file in an ENV
var named after the variable key.

Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/46806.

2 files changed, 41 insertions, 0 deletions

diff --git a/spec/support/shared_examples/controllers/variables_shared_examples.rb b/spec/support/shared_examples/controllers/variables_shared_examples.rb
index b615a8f54cf..e80722857ec 100644
--- a/spec/support/shared_examples/controllers/variables_shared_examples.rb
+++ b/spec/support/shared_examples/controllers/variables_shared_examples.rb
@@ -120,4 +120,16 @@ shared_examples 'PATCH #update updates variables' do
       expect(response).to match_response_schema('variables')
     end
   end
+
+  context 'for variables of type file' do
+    let(:variables_attributes) do
+      [
+        new_variable_attributes.merge(variable_type: 'file')
+      ]
+    end
+
+    it 'creates new variable of type file' do
+      expect { subject }.to change { owner.variables.file.count }.by(1)
+    end
+  end
 end
diff --git a/spec/support/shared_examples/models/ci_variable_shared_examples.rb b/spec/support/shared_examples/models/ci_variable_shared_examples.rb
new file mode 100644
index 00000000000..f93de8b6ff1
--- /dev/null
+++ b/spec/support/shared_examples/models/ci_variable_shared_examples.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+shared_examples_for 'CI variable' do
+  it { is_expected.to include_module(HasVariable) }
+
+  describe "variable type" do
+    it 'defines variable types' do
+      expect(described_class.variable_types).to eq({ "env_var" => 1, "file" => 2 })
+    end
+
+    it "defaults variable type to env_var" do
+      expect(subject.variable_type).to eq("env_var")
+    end
+
+    it "supports variable type file" do
+      variable = described_class.new(variable_type: :file)
+      expect(variable).to be_file
+    end
+  end
+
+  it 'strips whitespaces when assigning key' do
+    subject.key = " SECRET "
+    expect(subject.key).to eq("SECRET")
+  end
+
+  it 'can convert to runner variable' do
+    expect(subject.to_runner_variable.keys).to include(:key, :value, :public, :file)
+  end
+end