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spec_dir = File.expand_path File.join(File.dirname(__FILE__))
$LOAD_PATH.unshift spec_dir
$LOAD_PATH.uniq!

require "apply_auth_examples"
require "faraday"
require "googleauth/compute_engine"
require "spec_helper"

describe Google::Auth::GCECredentials do
  MD_URI = "http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/token".freeze
  GCECredentials = Google::Auth::GCECredentials

  before :example do
    @client = GCECredentials.new
  end

  def make_auth_stubs opts = {}
    access_token = opts[:access_token] || ""
    body = MultiJson.dump("access_token" => access_token,
                          "token_type"   => "Bearer",
                          "expires_in"   => 3600)
    stub_request(:get, MD_URI)
      .with(headers: { "Metadata-Flavor" => "Google" })
      .to_return(body:    body,
                 status:  200,
                 headers: { "Content-Type" => "application/json" })
  end

  it_behaves_like "apply/apply! are OK"

  context "metadata is unavailable" do
    describe "#fetch_access_token" do
      it "should fail if the metadata request returns a 404" do
        stub = stub_request(:get, MD_URI)
               .to_return(status:  404,
                          headers: { "Metadata-Flavor" => "Google" })
        expect { @client.fetch_access_token! }
          .to raise_error Signet::AuthorizationError
        expect(stub).to have_been_requested
      end

      it "should fail if the metadata request returns an unexpected code" do
        stub = stub_request(:get, MD_URI)
               .to_return(status:  503,
                          headers: { "Metadata-Flavor" => "Google" })
        expect { @client.fetch_access_token! }
          .to raise_error Signet::AuthorizationError
        expect(stub).to have_been_requested
      end

      it "should fail with Signet::AuthorizationError if request times out" do
        allow_any_instance_of(Faraday::Connection).to receive(:get)
          .and_raise(Faraday::TimeoutError)
        expect { @client.fetch_access_token! }
          .to raise_error Signet::AuthorizationError
      end

      it "should fail with Signet::AuthorizationError if request fails" do
        allow_any_instance_of(Faraday::Connection).to receive(:get)
          .and_raise(Faraday::ConnectionFailed, nil)
        expect { @client.fetch_access_token! }
          .to raise_error Signet::AuthorizationError
      end
    end
  end

  describe "#on_gce?" do
    it "should be true when Metadata-Flavor is Google" do
      stub = stub_request(:get, "http://169.254.169.254")
             .with(headers: { "Metadata-Flavor" => "Google" })
             .to_return(status:  200,
                        headers: { "Metadata-Flavor" => "Google" })
      expect(GCECredentials.on_gce?({}, true)).to eq(true)
      expect(stub).to have_been_requested
    end

    it "should be false when Metadata-Flavor is not Google" do
      stub = stub_request(:get, "http://169.254.169.254")
             .with(headers: { "Metadata-Flavor" => "Google" })
             .to_return(status:  200,
                        headers: { "Metadata-Flavor" => "NotGoogle" })
      expect(GCECredentials.on_gce?({}, true)).to eq(false)
      expect(stub).to have_been_requested
    end

    it "should be false if the response is not 200" do
      stub = stub_request(:get, "http://169.254.169.254")
             .with(headers: { "Metadata-Flavor" => "Google" })
             .to_return(status:  404,
                        headers: { "Metadata-Flavor" => "NotGoogle" })
      expect(GCECredentials.on_gce?({}, true)).to eq(false)
      expect(stub).to have_been_requested
    end
  end
end