# Scenario step implementations

    IMPLEMENTS GIVEN a users.yaml with user (\S+), password (\S+), scopes (.+)
    username = get_next_match()
    password = get_next_match()
    scopes_string = get_next_match()
    scopes = [s.strip() for s in scopes_string.split(',')]
    user = {
        'salt': 'nacl',
        'password': distixapi.encrypt_password('nacl', password),
        'cleartext': password,
        'scopes': scopes,
    }
    users = load_users()
    users['users'][username] = user
    save_users(users)

    IMPLEMENTS GIVEN a running backend instance
    backend = os.path.join(srcdir, 'distix-backend')
    cliapp.runcmd(
        ['/usr/sbin/daemonize', '-c', datadir,
         backend, '--pid-file', 'pid', '--port-file', 'port',
         '--log', 'distix-backend.log',
         '--users-file', 'users.yaml'])
    vars['pid'] = cat('pid').strip()
    vars['port'] = cat('port').strip()

    IMPLEMENTS FINALLY stop backend instance
    import signal
    print 'killing process', repr(vars['pid'])
    os.kill(int(vars['pid']), signal.SIGTERM)

    IMPLEMENTS WHEN user (\S+) makes request GET (\S+)
    user = get_next_match()
    path = get_next_match()
    url = 'http://localhost:{}{}'.format(vars['port'], path)
    print 'url:', repr(url)
    users = load_users()
    print repr(users)
    password = users['users'][user]['cleartext']
    import requests
    r = requests.get(url, auth=(user, password))
    vars['http-status'] = r.status_code
    vars['http-body'] = r.text

    IMPLEMENTS WHEN user (\S+) makes unauthenticated request GET (\S+)
    user = get_next_match()
    path = get_next_match()
    url = 'http://localhost:{}{}'.format(vars['port'], path)
    print 'url:', repr(url)
    import requests
    r = requests.get(url)
    vars['http-status'] = r.status_code
    vars['http-body'] = r.text

    IMPLEMENTS THEN HTTP status code is (\d+)
    wanted = int(os.environ['MATCH_1'])
    print 'wanted:', repr(wanted)
    print 'actual:', repr(vars['http-status'])
    assert vars['http-status'] == wanted

    IMPLEMENTS THEN result matches (.*)
    import json
    body = json.loads(vars['http-body'])
    pattern = json.loads(os.environ['MATCH_1'])
    assert type(body) == type(pattern)
    for key in pattern.keys():
        assert key in body
        assert body[key] == pattern[key]