require_relative 'spec_helper'
require_relative '../lib/gitlab_shell'
require_relative '../lib/gitlab_access_status'

describe GitlabShell do
  before do
    FileUtils.mkdir_p(tmp_repos_path)
  end

  after do
    FileUtils.rm_rf(tmp_repos_path)
  end

  subject do
    ARGV[0] = key_id
    GitlabShell.new(key_id).tap do |shell|
      shell.stub(exec_cmd: :exec_called)
      shell.stub(api: api)
    end
  end

  let(:api) do
    double(GitlabNet).tap do |api|
      api.stub(discover: { 'name' => 'John Doe' })
      api.stub(check_access: GitAccessStatus.new(true, 'ok', repo_path))
      api.stub(two_factor_recovery_codes: {
        'success' => true,
        'recovery_codes' => ['f67c514de60c4953', '41278385fc00c1e0']
      })
    end
  end

  let(:key_id) { "key-#{rand(100) + 100}" }
  let(:ssh_cmd) { nil }
  let(:tmp_repos_path) { File.join(ROOT_PATH, 'tmp', 'repositories') }

  let(:repo_name) { 'gitlab-ci.git' }
  let(:repo_path) { File.join(tmp_repos_path, repo_name) }

  before do
    GitlabConfig.any_instance.stub(audit_usernames: false)
  end

  describe :initialize do
    let(:ssh_cmd) { 'git-receive-pack' }

    its(:key_id) { should == key_id }
  end

  describe :parse_cmd do
    describe 'git' do
      context 'w/o namespace' do
        let(:ssh_args) { %W(git-upload-pack gitlab-ci.git) }

        before do
          subject.send :parse_cmd, ssh_args
        end

        its(:repo_name) { should == 'gitlab-ci.git' }
        its(:command) { should == 'git-upload-pack' }
      end

      context 'namespace' do
        let(:repo_name) { 'dmitriy.zaporozhets/gitlab-ci.git' }
        let(:ssh_args) { %W(git-upload-pack dmitriy.zaporozhets/gitlab-ci.git) }

        before do
          subject.send :parse_cmd, ssh_args
        end

        its(:repo_name) { should == 'dmitriy.zaporozhets/gitlab-ci.git' }
        its(:command) { should == 'git-upload-pack' }
      end

      context 'with an invalid number of arguments' do
        let(:ssh_args) { %W(foobar) }

        it "should raise an DisallowedCommandError" do
          expect { subject.send :parse_cmd, ssh_args }.to raise_error(GitlabShell::DisallowedCommandError)
        end
      end

      context 'with an API command' do
        before do
          subject.send :parse_cmd, ssh_args
        end

        context 'when generating recovery codes' do
          let(:ssh_args) { %w(2fa_recovery_codes) }

          it 'sets the correct command' do
            expect(subject.command).to eq('2fa_recovery_codes')
          end

          it 'does not set repo name' do
            expect(subject.repo_name).to be_nil
          end
        end
      end
    end

    describe 'git-annex' do
      let(:repo_name) { 'dzaporozhets/gitlab.git' }
      let(:ssh_args) { %W(git-annex-shell inannex /~/dzaporozhets/gitlab.git SHA256E) }

      before do
        GitlabConfig.any_instance.stub(git_annex_enabled?: true)

        subject.send :parse_cmd, ssh_args
      end

      its(:repo_name) { should == 'dzaporozhets/gitlab.git' }
      its(:command) { should == 'git-annex-shell' }
    end

    describe 'git-lfs' do
      let(:repo_name) { 'dzaporozhets/gitlab.git' }
      let(:ssh_args) { %W(git-lfs-authenticate dzaporozhets/gitlab.git download) }

      before do
        subject.send :parse_cmd, ssh_args
      end

      its(:repo_name) { should == 'dzaporozhets/gitlab.git' }
      its(:command) { should == 'git-lfs-authenticate' }
      its(:git_access) { should == 'git-upload-pack' }
    end

    describe 'git-lfs old clients' do
      let(:repo_name) { 'dzaporozhets/gitlab.git' }
      let(:ssh_args) { %W(git-lfs-authenticate dzaporozhets/gitlab.git download long_oid) }

      before do
        subject.send :parse_cmd, ssh_args
      end

      its(:repo_name) { should == 'dzaporozhets/gitlab.git' }
      its(:command) { should == 'git-lfs-authenticate' }
      its(:git_access) { should == 'git-upload-pack' }
    end
  end

  describe :exec do

    context 'git-upload-pack' do
      let(:ssh_cmd) { "git-upload-pack gitlab-ci.git" }
      after { subject.exec(ssh_cmd) }

      it "should process the command" do
        subject.should_receive(:process_cmd).with(%W(git-upload-pack gitlab-ci.git))
      end

      it "should execute the command" do
        subject.should_receive(:exec_cmd).with("git-upload-pack", repo_path)
      end

      it "should log the command execution" do
        message = "gitlab-shell: executing git command "
        message << "<git-upload-pack #{repo_path}> "
        message << "for user with key #{key_id}."
        $logger.should_receive(:info).with(message)
      end

      it "should use usernames if configured to do so" do
        GitlabConfig.any_instance.stub(audit_usernames: true)
        $logger.should_receive(:info) { |msg| msg.should =~ /for John Doe/ }
      end
    end

    context 'git-receive-pack' do
      let(:ssh_cmd) { "git-receive-pack gitlab-ci.git" }
      after { subject.exec(ssh_cmd) }

      it "should process the command" do
        subject.should_receive(:process_cmd).with(%W(git-receive-pack gitlab-ci.git))
      end

      it "should execute the command" do
        subject.should_receive(:exec_cmd).with("git-receive-pack", repo_path)
      end

      it "should log the command execution" do
        message = "gitlab-shell: executing git command "
        message << "<git-receive-pack #{repo_path}> "
        message << "for user with key #{key_id}."
        $logger.should_receive(:info).with(message)
      end
    end

    context 'arbitrary command' do
      let(:ssh_cmd) { 'arbitrary command' }
      after { subject.exec(ssh_cmd) }

      it "should not process the command" do
        subject.should_not_receive(:process_cmd)
      end

      it "should not execute the command" do
        subject.should_not_receive(:exec_cmd)
      end

      it "should log the attempt" do
        message = "gitlab-shell: Attempt to execute disallowed command <arbitrary command> by user with key #{key_id}."
        $logger.should_receive(:warn).with(message)
      end
    end

    context 'no command' do
      after { subject.exec(nil) }

      it "should call api.discover" do
        api.should_receive(:discover).with(key_id)
      end
    end

    context "failed connection" do
      let(:ssh_cmd) { 'git-upload-pack gitlab-ci.git' }

      before {
        api.stub(:check_access).and_raise(GitlabNet::ApiUnreachableError)
      }
      after { subject.exec(ssh_cmd) }

      it "should not process the command" do
        subject.should_not_receive(:process_cmd)
      end

      it "should not execute the command" do
        subject.should_not_receive(:exec_cmd)
      end
    end

    describe 'git-annex' do
      let(:repo_name) { 'dzaporozhets/gitlab.git' }

      before do
        GitlabConfig.any_instance.stub(git_annex_enabled?: true)
      end

      context 'initialization' do
        let(:ssh_cmd) { "git-annex-shell inannex /~/gitlab-ci.git SHA256E" }

        before do
          # Create existing project
          FileUtils.mkdir_p(repo_path)
          cmd = %W(git --git-dir=#{repo_path} init --bare)
          system(*cmd)

          subject.exec(ssh_cmd)
        end

        it 'should init git-annex' do
          File.exists?(repo_path).should be_true
        end

        context 'with git-annex-shell gcryptsetup' do
          let(:ssh_cmd) { "git-annex-shell gcryptsetup /~/dzaporozhets/gitlab.git" }

          it 'should not init git-annex' do
            File.exists?(File.join(tmp_repos_path, 'dzaporozhets/gitlab.git/annex')).should be_false
          end
        end

        context 'with git-annex and relative path without ~/' do
          # Using a SSH URL on a custom port will generate /dzaporozhets/gitlab.git
          let(:ssh_cmd) { "git-annex-shell inannex dzaporozhets/gitlab.git SHA256E" }

          it 'should init git-annex' do
            File.exists?(File.join(tmp_repos_path, "dzaporozhets/gitlab.git/annex")).should be_true
          end
        end
      end

      context 'execution' do
        let(:ssh_cmd) { "git-annex-shell commit /~/gitlab-ci.git SHA256" }

        after { subject.exec(ssh_cmd) }

        it "should execute the command" do
          subject.should_receive(:exec_cmd).with("git-annex-shell", "commit", repo_path, "SHA256")
        end
      end
    end

    context 'with an API command' do
      before do
        allow(subject).to receive(:continue?).and_return(true)
      end

      context 'when generating recovery codes' do
        let(:ssh_cmd) { '2fa_recovery_codes' }
        after do
          subject.exec(ssh_cmd)
        end

        it 'does not call verify_access' do
          expect(subject).not_to receive(:verify_access)
        end

        it 'calls the corresponding method' do
          expect(subject).to receive(:api_2fa_recovery_codes)
        end

        it 'outputs recovery codes' do
          expect($stdout).to receive(:puts)
            .with(/f67c514de60c4953\n41278385fc00c1e0/)
        end

        context 'when the process is unsuccessful' do
          it 'displays the error to the user' do
            api.stub(two_factor_recovery_codes: {
              'success' => false,
              'message' => 'Could not find the given key'
            })

            expect($stdout).to receive(:puts)
              .with(/Could not find the given key/)
          end
        end
      end
    end
  end

  describe :validate_access do
    let(:ssh_cmd) { "git-upload-pack gitlab-ci.git" }

    describe 'check access with api' do
      after { subject.exec(ssh_cmd) }

      it "should call api.check_access" do
        api.should_receive(:check_access).with('git-upload-pack', 'gitlab-ci.git', key_id, '_any', 'ssh')
      end

      it "should disallow access and log the attempt if check_access returns false status" do
        api.stub(check_access: GitAccessStatus.new(false, 'denied', nil))
        message = "gitlab-shell: Access denied for git command <git-upload-pack gitlab-ci.git> "
        message << "by user with key #{key_id}."
        $logger.should_receive(:warn).with(message)
      end
    end

    describe 'set the repository path' do
      context 'with a correct path' do
        before { subject.exec(ssh_cmd) }

        its(:repo_path) { should == repo_path }
      end

      context "with a path that doesn't match an absolute path" do
        before do
          File.stub(:absolute_path) { 'y/gitlab-ci.git' }
        end

        it "refuses to assign the path" do
          $stderr.should_receive(:puts).with("GitLab: Invalid repository path")
          expect(subject.exec(ssh_cmd)).to be_false
        end
      end
    end
  end

  describe :exec_cmd do
    let(:shell) { GitlabShell.new(key_id) }
    before { Kernel.stub(:exec) }

    it "uses Kernel::exec method" do
      Kernel.should_receive(:exec).with(kind_of(Hash), 1, 2, unsetenv_others: true).once
      shell.send :exec_cmd, 1, 2
    end

    it "refuses to execute a lone non-array argument" do
      expect { shell.send :exec_cmd, 1 }.to raise_error(GitlabShell::DisallowedCommandError)
    end

    it "allows one argument if it is an array" do
      Kernel.should_receive(:exec).with(kind_of(Hash), [1, 2], unsetenv_others: true).once
      shell.send :exec_cmd, [1, 2]
    end

    context "when specifying a git_tracing log file" do
      let(:git_trace_log_file) { '/tmp/git_trace_performance.log' }

      before do
        GitlabConfig.any_instance.stub(git_trace_log_file: git_trace_log_file)
        shell
      end

      it "uses GIT_TRACE_PERFORMANCE" do
        expected_hash = hash_including(
          'GIT_TRACE' => git_trace_log_file,
          'GIT_TRACE_PACKET' => git_trace_log_file,
          'GIT_TRACE_PERFORMANCE' => git_trace_log_file
        )
        Kernel.should_receive(:exec).with(expected_hash, [1, 2], unsetenv_others: true).once

        shell.send :exec_cmd, [1, 2]
      end

      context "when provides a relative path" do
        let(:git_trace_log_file) { 'git_trace_performance.log' }

        it "does not uses GIT_TRACE*" do
          # If we try to use it we'll show a warning to the users
          expected_hash = hash_excluding(
            'GIT_TRACE', 'GIT_TRACE_PACKET', 'GIT_TRACE_PERFORMANCE'
          )
          Kernel.should_receive(:exec).with(expected_hash, [1, 2], unsetenv_others: true).once

          shell.send :exec_cmd, [1, 2]
        end

        it "writes an entry on the log" do
          expect($logger).to receive(:warn).
            with("gitlab-shell: is configured to trace git commands with #{git_trace_log_file.inspect} but an absolute path needs to be provided")

          Kernel.should_receive(:exec).with(kind_of(Hash), [1, 2], unsetenv_others: true).once
          shell.send :exec_cmd, [1, 2]
        end
      end

      context "when provides a file not writable" do
        before do
          expect(File).to receive(:open).with(git_trace_log_file, 'a').and_raise(Errno::EACCES)
        end

        it "does not uses GIT_TRACE*" do
          # If we try to use it we'll show a warning to the users
          expected_hash = hash_excluding(
            'GIT_TRACE', 'GIT_TRACE_PACKET', 'GIT_TRACE_PERFORMANCE'
          )
          Kernel.should_receive(:exec).with(expected_hash, [1, 2], unsetenv_others: true).once

          shell.send :exec_cmd, [1, 2]
        end

        it "writes an entry on the log" do
          expect($logger).to receive(:warn).
            with("gitlab-shell: is configured to trace git commands with #{git_trace_log_file.inspect} but it's not possible to write in that path Permission denied")

          Kernel.should_receive(:exec).with(kind_of(Hash), [1, 2], unsetenv_others: true).once
          shell.send :exec_cmd, [1, 2]
        end
      end
    end
  end

  describe :api do
    let(:shell) { GitlabShell.new(key_id) }
    subject { shell.send :api }

    it { should be_a(GitlabNet) }
  end
end