# frozen_string_literal: true

require 'spec_helper'
require_relative '../../../config/initializers/sentry'

RSpec.describe API::Helpers, :enable_admin_mode, feature_category: :system_access do
  include API::APIGuard::HelperMethods
  include described_class
  include TermsHelper

  using RSpec::Parameterized::TableSyntax

  let_it_be(:organization) { create(:organization) }
  let_it_be(:user, reload: true) { create(:user, organizations: [organization]) }

  let(:admin) { create(:admin) }
  let(:key) { create(:key, user: user) }

  let(:csrf_token) { SecureRandom.base64(ActionController::RequestForgeryProtection::AUTHENTICITY_TOKEN_LENGTH) }
  let(:env) do
    {
      'rack.input' => '',
      'rack.session' => {
        _csrf_token: csrf_token
      },
      'REQUEST_METHOD' => 'GET',
      'CONTENT_TYPE' => 'text/plain;charset=utf-8'
    }
  end

  let(:header) {}
  let(:request) { Grape::Request.new(env) }
  let(:params) { request.params }

  before do
    allow_any_instance_of(self.class).to receive(:options).and_return({})

    allow(env['rack.session']).to receive(:enabled?).and_return(true)
    allow(env['rack.session']).to receive(:loaded?).and_return(true)
  end

  def warden_authenticate_returns(value)
    warden = double("warden", authenticate: value)
    env['warden'] = warden
  end

  def error!(message, status, header)
    raise StandardError, "#{status} - #{message}"
  end

  def set_param(key, value)
    request.update_param(key, value)
  end

  describe ".current_user" do
    subject { current_user }

    describe "Warden authentication", :allow_forgery_protection do
      context "with invalid credentials" do
        context "GET request" do
          before do
            env['REQUEST_METHOD'] = 'GET'
          end

          it { is_expected.to be_nil }
        end
      end

      context "with valid credentials" do
        before do
          warden_authenticate_returns user
        end

        context "GET request" do
          before do
            env['REQUEST_METHOD'] = 'GET'
          end

          it { is_expected.to eq(user) }

          it 'sets the environment with data of the current user' do
            subject

            expect(env[API::Helpers::API_USER_ENV]).to eq({ user_id: subject.id, username: subject.username })
          end
        end

        context "HEAD request" do
          before do
            env['REQUEST_METHOD'] = 'HEAD'
          end

          it { is_expected.to eq(user) }

          context 'when user should have 2fa enabled' do
            before do
              allow(user).to receive(:require_two_factor_authentication_from_group?).and_return(true)
              allow_next_instance_of(Gitlab::Auth::TwoFactorAuthVerifier) do |verifier|
                allow(verifier).to receive(:two_factor_grace_period_expired?).and_return(true)
              end
            end

            context 'when 2fa is not enabled' do
              it { is_expected.to be_nil }
            end

            context 'when 2fa is enabled' do
              before do
                allow(user).to receive(:two_factor_enabled?).and_return(true)
              end

              it { is_expected.to eq(user) }
            end
          end
        end

        context "PUT request" do
          before do
            env['REQUEST_METHOD'] = 'PUT'
          end

          context 'without CSRF token' do
            it { is_expected.to be_nil }
          end

          context 'with CSRF token' do
            before do
              env['HTTP_X_CSRF_TOKEN'] = csrf_token
            end

            it { is_expected.to eq(user) }
          end
        end

        context "POST request" do
          before do
            env['REQUEST_METHOD'] = 'POST'
          end

          context 'without CSRF token' do
            it { is_expected.to be_nil }
          end

          context 'with CSRF token' do
            before do
              env['HTTP_X_CSRF_TOKEN'] = csrf_token
            end

            it { is_expected.to eq(user) }
          end
        end

        context "DELETE request" do
          before do
            env['REQUEST_METHOD'] = 'DELETE'
          end

          context 'without CSRF token' do
            it { is_expected.to be_nil }
          end

          context 'with CSRF token' do
            before do
              env['HTTP_X_CSRF_TOKEN'] = csrf_token
            end

            it { is_expected.to eq(user) }
          end
        end
      end
    end

    describe "when authenticating using a user's personal access tokens" do
      let(:personal_access_token) { create(:personal_access_token, user: user) }

      it "returns a 401 response for an invalid token" do
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = 'invalid token'

        expect { current_user }.to raise_error(/401/)
      end

      it "returns a 403 response for a user without access" do
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token
        allow_any_instance_of(Gitlab::UserAccess).to receive(:allowed?).and_return(false)

        expect { current_user }.to raise_error(/403/)
      end

      it 'returns a 403 response for a user who is blocked' do
        user.block!
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token

        expect { current_user }.to raise_error(/403/)
      end

      context 'when terms are enforced' do
        before do
          enforce_terms
          env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token
        end

        it 'returns a 403 when a user has not accepted the terms' do
          expect { current_user }.to raise_error(/must accept the Terms of Service/)
        end

        it 'sets the current user when the user accepted the terms' do
          accept_terms(user)

          expect(current_user).to eq(user)
        end
      end

      it "sets current_user" do
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token
        expect(current_user).to eq(user)
      end

      it "does not allow tokens without the appropriate scope" do
        personal_access_token = create(:personal_access_token, user: user, scopes: ['read_user'])
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token

        expect { current_user }.to raise_error Gitlab::Auth::InsufficientScopeError
      end

      it 'does not allow revoked tokens' do
        personal_access_token.revoke!
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token

        expect { current_user }.to raise_error Gitlab::Auth::RevokedError
      end

      it 'does not allow expired tokens' do
        personal_access_token.update!(expires_at: 1.day.ago)
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token

        expect { current_user }.to raise_error Gitlab::Auth::ExpiredError
      end

      context 'when impersonation is disabled' do
        let(:personal_access_token) { create(:personal_access_token, :impersonation, user: user) }

        before do
          stub_config_setting(impersonation_enabled: false)
          env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = personal_access_token.token
        end

        it 'does not allow impersonation tokens' do
          expect { current_user }.to raise_error Gitlab::Auth::ImpersonationDisabled
        end
      end
    end

    describe "when authenticating using a job token" do
      let_it_be(:job, reload: true) do
        create(:ci_build, user: user, status: :running)
      end

      let(:route_authentication_setting) { {} }

      before do
        allow_any_instance_of(self.class).to receive(:route_authentication_setting)
          .and_return(route_authentication_setting)
      end

      context 'when route is allowed to be authenticated' do
        let(:route_authentication_setting) { { job_token_allowed: true } }

        it "returns a 401 response for an invalid token" do
          env[Gitlab::Auth::AuthFinders::JOB_TOKEN_HEADER] = 'invalid token'

          expect { current_user }.to raise_error(/401/)
        end

        it "returns a 401 response for a job that's not running" do
          job.update!(status: :success)
          env[Gitlab::Auth::AuthFinders::JOB_TOKEN_HEADER] = job.token

          expect { current_user }.to raise_error(/401/)
        end

        it "returns a 403 response for a user without access" do
          env[Gitlab::Auth::AuthFinders::JOB_TOKEN_HEADER] = job.token
          allow_any_instance_of(Gitlab::UserAccess).to receive(:allowed?).and_return(false)

          expect { current_user }.to raise_error(/403/)
        end

        it 'returns a 403 response for a user who is blocked' do
          user.block!
          env[Gitlab::Auth::AuthFinders::JOB_TOKEN_HEADER] = job.token

          expect { current_user }.to raise_error(/403/)
        end

        it "sets current_user" do
          env[Gitlab::Auth::AuthFinders::JOB_TOKEN_HEADER] = job.token

          expect(current_user).to eq(user)
        end
      end

      context 'when route is not allowed to be authenticated' do
        let(:route_authentication_setting) { { job_token_allowed: false } }

        it "sets current_user to nil" do
          env[Gitlab::Auth::AuthFinders::JOB_TOKEN_HEADER] = job.token
          allow_any_instance_of(Gitlab::UserAccess).to receive(:allowed?).and_return(true)

          expect(current_user).to be_nil
        end
      end
    end

    describe 'when authenticating using a granular token' do
      let_it_be(:granular_pat) { create(:granular_pat) }

      before do
        env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = granular_pat.token
        allow(self).to receive(:route_setting)
      end

      context 'when the `authorize_granular_pats` feature flag is disabled' do
        before do
          stub_feature_flags(authorize_granular_pats: false)
        end

        it 'raises an error stating that the feature is not yet supported' do
          expect { current_user }.to raise_error Gitlab::Auth::GranularPermissionsError,
            'Granular tokens are not yet supported'
        end
      end

      context 'when authorization permissions and boundary type are not defined for an endpoint' do
        it 'raises an error stating that the permissions cannot be determined' do
          expect { current_user }.to raise_error Gitlab::Auth::GranularPermissionsError,
            'Unable to determine boundary and permissions for authorization'
        end
      end

      context 'when authorization permissions are defined for an endpoint' do
        before do
          env['PATH_INFO'] = "/api/v4/#{boundary_segment}/endpoint"
          allow(self).to receive(:route_setting).with(:authorization)
            .and_return(permissions: permission, boundary_type: boundary_type)

          if boundary_resource != standalone_resource
            allow(self).to receive(:params).and_return(boundary_parameter => boundary_resource.id)
          end
        end

        let_it_be(:permission) { :create_issue }
        let_it_be(:project_resource) { create(:project, organization: user.organization) }
        let_it_be(:group_resource) { create(:group, organization: user.organization) }
        let_it_be(:standalone_resource) { nil }
        let(:boundary) { ::Authz::Boundary.for(boundary_resource) }

        where(:boundary_type, :boundary_resource, :boundary_segment, :boundary_parameter) do
          :project    | ref(:project_resource)    | 'projects' | :project_id
          :project    | ref(:project_resource)    | 'projects' | :id
          :group      | ref(:group_resource)      | 'groups'   | :group_id
          :group      | ref(:group_resource)      | 'groups'   | :id
          :standalone | ref(:standalone_resource) | ''         | nil
        end

        with_them do
          context 'when the granular token scopes are insufficient' do
            let(:message) do
              msg = "Access denied: Your Personal Access Token lacks the required permissions: [#{permission}]"
              msg << " for \"#{boundary.path}\"" if boundary_resource != standalone_resource
              msg << "."
            end

            it 'raises an error that includes the missing scope' do
              expect { current_user }.to raise_error Gitlab::Auth::GranularPermissionsError, message
            end
          end

          context 'when the granular token scopes are sufficient' do
            let(:granular_pat) do
              create(:granular_pat, user: user, permissions: permission, namespace: boundary.namespace)
            end

            it 'does not raise an error and returns the token user' do
              expect(current_user).to eq(user)
            end
          end
        end
      end
    end
  end

  describe '.set_current_organization' do
    context 'when user argument is omitted' do
      before do
        allow(self).to receive(:current_user).and_return(user)
      end

      it 'sets Current.organization using current_user' do
        set_current_organization

        expect(Current.organization).to eq(organization)
      end
    end

    context 'when user is passed' do
      let(:other_user) { create(:user, organizations: [create(:organization)]) }

      it 'sets Current.organization' do
        set_current_organization(user: other_user)

        expect(Current.organization).to eq(other_user.organization)
      end
    end
  end

  describe '.handle_api_exception' do
    before do
      allow_any_instance_of(self.class).to receive(:rack_response)

      stub_sentry_settings

      expect(Gitlab::ErrorTracking).to receive(:sentry_dsn).and_return(Gitlab.config.sentry.dsn)
      Gitlab::ErrorTracking.configure
    end

    it 'does not report a MethodNotAllowed exception to Sentry' do
      exception = Grape::Exceptions::MethodNotAllowed.new({ 'X-GitLab-Test' => '1' })
      allow(exception).to receive(:backtrace).and_return(caller)

      expect(Gitlab::ErrorTracking).not_to receive(:track_exception).with(exception)

      handle_api_exception(exception)
    end

    it 'does report RuntimeError to Sentry' do
      exception = RuntimeError.new('test error')
      allow(exception).to receive(:backtrace).and_return(caller)

      expect(Gitlab::ErrorTracking).to receive(:track_exception).with(exception)

      Labkit::Correlation::CorrelationId.use_id('new-correlation-id') do
        handle_api_exception(exception)
      end
    end

    context 'with a personal access token given' do
      let(:token) { create(:personal_access_token, scopes: ['api'], user: user) }

      # Regression test for https://gitlab.com/gitlab-org/gitlab-foss/issues/38571
      it 'does not raise an additional exception because of missing `request`' do
        # We need to stub at a lower level than #sentry_enabled? otherwise
        # Sentry is not enabled when the request below is made, and the test
        # would pass even without the fix
        expect(ProjectsFinder).to receive(:new).and_raise('Runtime Error!')

        get api('/projects', personal_access_token: token)

        # The 500 status is expected as we're testing a case where an exception
        # is raised, but Grape shouldn't raise an additional exception
        expect(response).to have_gitlab_http_status(:internal_server_error)
        expect(json_response['message']).not_to include("undefined local variable or method `request'")
        expect(json_response['message']).to start_with("\nRuntimeError (Runtime Error!):")
      end
    end
  end

  describe '.authenticate_non_get!' do
    %w[HEAD GET].each do |method_name|
      context "method is #{method_name}" do
        before do
          expect_any_instance_of(self.class).to receive(:route).and_return(double(request_method: method_name))
        end

        it 'does not raise an error' do
          expect_any_instance_of(self.class).not_to receive(:authenticate!)

          expect { authenticate_non_get! }.not_to raise_error
        end
      end
    end

    %w[POST PUT PATCH DELETE].each do |method_name|
      context "method is #{method_name}" do
        before do
          expect_any_instance_of(self.class).to receive(:route).and_return(double(request_method: method_name))
        end

        it 'calls authenticate!' do
          expect_any_instance_of(self.class).to receive(:authenticate!)

          authenticate_non_get!
        end
      end
    end
  end

  describe '.authenticate!' do
    context 'current_user is nil' do
      before do
        expect_any_instance_of(self.class).to receive(:current_user).and_return(nil)
      end

      it 'returns a 401 response' do
        expect { authenticate! }.to raise_error(/401/)

        expect(env[described_class::API_RESPONSE_STATUS_CODE]).to eq(401)
      end
    end

    context 'current_user is present' do
      let(:user) { build(:user) }

      before do
        expect_any_instance_of(self.class).to receive(:current_user).and_return(user)
      end

      it 'does not raise an error' do
        expect { authenticate! }.not_to raise_error

        expect(env[described_class::API_RESPONSE_STATUS_CODE]).to be_nil
      end
    end
  end

  context 'sudo' do
    include_context 'custom session'

    shared_examples 'successful sudo' do
      it 'sets current_user' do
        expect(current_user).to eq(user)
      end

      it 'sets sudo?' do
        expect(sudo?).to be_truthy
      end
    end

    shared_examples 'sudo' do
      context 'when admin' do
        before do
          token.user = admin
          token.save!
        end

        context 'when token has sudo scope' do
          before do
            token.scopes = %w[sudo]
            token.save!
          end

          context 'when user exists' do
            context 'when using header' do
              context 'when providing username' do
                before do
                  env[API::Helpers::SUDO_HEADER] = user.username
                end

                it_behaves_like 'successful sudo'
              end

              context 'when providing username (case insensitive)' do
                before do
                  env[API::Helpers::SUDO_HEADER] = user.username.upcase
                end

                it_behaves_like 'successful sudo'
              end

              context 'when providing user ID' do
                before do
                  env[API::Helpers::SUDO_HEADER] = user.id.to_s
                end

                it_behaves_like 'successful sudo'
              end
            end

            context 'when using param' do
              context 'when providing username' do
                before do
                  set_param(API::Helpers::SUDO_PARAM, user.username)
                end

                it_behaves_like 'successful sudo'
              end

              context 'when providing username (case insensitive)' do
                before do
                  set_param(API::Helpers::SUDO_PARAM, user.username.upcase)
                end

                it_behaves_like 'successful sudo'
              end

              context 'when providing user ID' do
                before do
                  set_param(API::Helpers::SUDO_PARAM, user.id.to_s)
                end

                it_behaves_like 'successful sudo'
              end
            end
          end

          context 'when user does not exist' do
            before do
              set_param(API::Helpers::SUDO_PARAM, 'nonexistent')
            end

            it 'raises an error' do
              expect { current_user }.to raise_error(/User with ID or username 'nonexistent' Not Found/)
            end
          end
        end

        context 'when token does not have sudo scope' do
          before do
            token.scopes = %w[api]
            token.save!

            set_param(API::Helpers::SUDO_PARAM, user.id.to_s)
          end

          it 'raises an error' do
            expect { current_user }.to raise_error Gitlab::Auth::InsufficientScopeError
          end
        end
      end

      context 'when not admin' do
        before do
          token.user = user
          token.save!

          set_param(API::Helpers::SUDO_PARAM, user.id.to_s)
        end

        it 'raises an error' do
          expect { current_user }.to raise_error(/Must be admin to use sudo/)
        end
      end
    end

    context 'using an OAuth token' do
      let(:token) { create(:oauth_access_token) }

      before do
        env['HTTP_AUTHORIZATION'] = "Bearer #{token.plaintext_token}"
      end

      it_behaves_like 'sudo'
    end

    context 'using a personal access token' do
      let(:token) { create(:personal_access_token) }

      context 'passed as param' do
        before do
          set_param(Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_PARAM, token.token)
        end

        it_behaves_like 'sudo'
      end

      context 'passed as header' do
        before do
          env[Gitlab::Auth::AuthFinders::PRIVATE_TOKEN_HEADER] = token.token
        end

        it_behaves_like 'sudo'
      end
    end

    context 'using warden authentication' do
      before do
        allow(session).to receive(:enabled?).and_return(true)
        allow(session).to receive(:loaded?).and_return(true)

        warden_authenticate_returns admin
        env[API::Helpers::SUDO_HEADER] = user.username
      end

      it 'raises an error' do
        expect { current_user }.to raise_error(/Must be authenticated using an OAuth or personal access token to use sudo/)
      end
    end
  end
end
