import unittest
import requests

from flask import request, jsonify
from flask.blueprints import Blueprint
from flask.ext.testing import LiveServerTestCase

from app import app
from endpoints.v1 import v1_bp
from endpoints.api import api_bp
from initdb import wipe_database, initialize_database, populate_database
from endpoints.csrf import generate_csrf_token

import endpoints.decorated
import json
import features

import tarfile

from cStringIO import StringIO
from digest.checksums import compute_simple

try:
  app.register_blueprint(v1_bp, url_prefix='/v1')
  app.register_blueprint(api_bp, url_prefix='/api')
except ValueError:
  # Blueprint was already registered
  pass


# Add a test blueprint for generating CSRF tokens and setting feature flags.
testbp = Blueprint('testbp', __name__)

@testbp.route('/csrf', methods=['GET'])
def generate_csrf():
  return generate_csrf_token()

@testbp.route('/feature/<feature_name>', methods=['POST'])
def set_feature(feature_name):
  import features
  old_value = features._FEATURES[feature_name].value
  features._FEATURES[feature_name].value = request.get_json()['value']
  return jsonify({'old_value': old_value})

app.register_blueprint(testbp, url_prefix='/__test')


class TestFeature(object):
  """ Helper object which temporarily sets the value of a feature flag.
  """

  def __init__(self, test_case, feature_flag, test_value):
    self.test_case = test_case
    self.feature_flag = feature_flag
    self.test_value = test_value
    self.old_value = None

  def __enter__(self):
    result = self.test_case.conduct('POST', '/__test/feature/' + self.feature_flag,
                                    data=json.dumps(dict(value=self.test_value)),
                                    headers={'Content-Type': 'application/json'})

    result_data = json.loads(result.text)
    self.old_value = result_data['old_value']

  def __exit__(self, type, value, traceback):
    self.test_case.conduct('POST', '/__test/feature/' + self.feature_flag,
                           data=json.dumps(dict(value=self.old_value)),
                           headers={'Content-Type': 'application/json'})

class RegistryTestCase(LiveServerTestCase):
  maxDiff = None

  def create_app(self):
    app.config['TESTING'] = True
    return app

  def setUp(self):
    # Note: We cannot use the normal savepoint-based DB setup here because we are accessing
    # different app instances remotely via a live webserver, which is multiprocess. Therefore, we
    # completely clear the database between tests.
    wipe_database()
    initialize_database()
    populate_database()

    self.clearSession()

  def clearSession(self):
    self.session = requests.Session()
    self.signature = None
    self.docker_token = 'true'

    # Load the CSRF token.
    self.csrf_token = ''
    self.csrf_token = self.conduct('GET', '/__test/csrf').text

  def conduct(self, method, url, headers=None, data=None, auth=None, expected_code=200):
    headers = headers or {}
    headers['X-Docker-Token'] = self.docker_token

    if self.signature and not auth:
      headers['Authorization'] = 'token ' + self.signature

    response = self.session.request(method, self.get_server_url() + url, headers=headers, data=data,
                                    auth=auth, params=dict(_csrf_token=self.csrf_token))
    if response.status_code != expected_code:
      print response.text

    if 'www-authenticate' in response.headers:
      self.signature = response.headers['www-authenticate']

    if 'X-Docker-Token' in response.headers:
      self.docker_token = response.headers['X-Docker-Token']

    self.assertEquals(response.status_code, expected_code)
    return response

  def ping(self):
    self.conduct('GET', '/v1/_ping')

  def do_login(self, username, password='password'):
    self.ping()
    result = self.conduct('POST', '/v1/users/',
                           data=json.dumps(dict(username=username, password=password,
                                                email='bar@example.com')),
                           headers={"Content-Type": "application/json"},
                           expected_code=400)

    self.assertEquals(result.text, '"Username or email already exists"')
    self.conduct('GET', '/v1/users/', auth=(username, password))

  def do_push(self, namespace, repository, username, password, images):
    auth = (username, password)

    # Ping!
    self.ping()

    # PUT /v1/repositories/{namespace}/{repository}/
    data = [{"id": image['id']} for image in images]
    self.conduct('PUT', '/v1/repositories/%s/%s' % (namespace, repository),
                 data=json.dumps(data), auth=auth,
                 expected_code=201)

    for image in images:
      # PUT /v1/images/{imageID}/json
      self.conduct('PUT', '/v1/images/%s/json' % image['id'], data=json.dumps(image))

      # PUT /v1/images/{imageID}/layer
      tar_file_info = tarfile.TarInfo(name='image_name')
      tar_file_info.type = tarfile.REGTYPE
      tar_file_info.size = len(image['id'])

      layer_data = StringIO()

      tar_file = tarfile.open(fileobj=layer_data, mode='w|gz')
      tar_file.addfile(tar_file_info, StringIO(image['id']))
      tar_file.close()

      layer_bytes = layer_data.getvalue()
      layer_data.close()

      self.conduct('PUT', '/v1/images/%s/layer' % image['id'], data=StringIO(layer_bytes))

      # PUT /v1/images/{imageID}/checksum
      checksum = compute_simple(StringIO(layer_bytes), json.dumps(image))
      self.conduct('PUT', '/v1/images/%s/checksum' % image['id'],
                   headers={'X-Docker-Checksum-Payload': checksum})


    # PUT /v1/repositories/{namespace}/{repository}/tags/latest
    self.conduct('PUT', '/v1/repositories/%s/%s/tags/latest' % (namespace, repository),
                 data='"' + images[0]['id'] + '"')

    # PUT /v1/repositories/{namespace}/{repository}/images
    self.conduct('PUT', '/v1/repositories/%s/%s/images' % (namespace, repository),
                 expected_code=204)


  def do_pull(self, namespace, repository, username=None, password='password', expected_code=200):
    auth = None
    if username:
      auth = (username, password)

    # Ping!
    self.ping()

    prefix = '/v1/repositories/%s/%s/' % (namespace, repository)

    # GET /v1/repositories/{namespace}/{repository}/
    self.conduct('GET', prefix + 'images', auth=auth, expected_code=expected_code)
    if expected_code != 200:
      return

    # GET /v1/repositories/{namespace}/{repository}/
    result = json.loads(self.conduct('GET', prefix + 'tags').text)

    for image_id in result.values():
      # /v1/images/{imageID}/{ancestry, json, layer}
      image_prefix = '/v1/images/%s/' % image_id
      self.conduct('GET', image_prefix + 'ancestry')
      self.conduct('GET', image_prefix + 'json')
      self.conduct('GET', image_prefix + 'layer')

  def conduct_api_login(self, username, password):
    self.conduct('POST', '/api/v1/signin',
                 data=json.dumps(dict(username=username, password=password)),
                 headers={'Content-Type': 'application/json'})

  def change_repo_visibility(self, repository, namespace, visibility):
    self.conduct('POST', '/api/v1/repository/%s/%s/changevisibility' % (repository, namespace),
                 data=json.dumps(dict(visibility=visibility)),
                 headers={'Content-Type': 'application/json'})


class RegistryTests(RegistryTestCase):
  def test_pull_publicrepo_anonymous(self):
    # Add a new repository under the public user, so we have a real repository to pull.
    images = [{
      'id': 'onlyimagehere'
    }]
    self.do_push('public', 'newrepo', 'public', 'password', images)
    self.clearSession()

    # First try to pull the (currently private) repo anonymously, which should fail (since it is
    # private)
    self.do_pull('public', 'newrepo', expected_code=403)

    # Make the repository public.
    self.conduct_api_login('public', 'password')
    self.change_repo_visibility('public', 'newrepo', 'public')
    self.clearSession()

    # Pull the repository anonymously, which should succeed because the repository is public.
    self.do_pull('public', 'newrepo')


  def test_pull_publicrepo_devtable(self):
    # Add a new repository under the public user, so we have a real repository to pull.
    images = [{
      'id': 'onlyimagehere'
    }]
    self.do_push('public', 'newrepo', 'public', 'password', images)
    self.clearSession()

    # First try to pull the (currently private) repo as devtable, which should fail as it belongs
    # to public.
    self.do_pull('public', 'newrepo', 'devtable', 'password', expected_code=403)

    # Make the repository public.
    self.conduct_api_login('public', 'password')
    self.change_repo_visibility('public', 'newrepo', 'public')
    self.clearSession()

    # Pull the repository as devtable, which should succeed because the repository is public.
    self.do_pull('public', 'newrepo', 'devtable', 'password')


  def test_pull_private_repo(self):
    # Add a new repository under the devtable user, so we have a real repository to pull.
    images = [{
      'id': 'onlyimagehere'
    }]
    self.do_push('devtable', 'newrepo', 'devtable', 'password', images)
    self.clearSession()

    # First try to pull the (currently private) repo as public, which should fail as it belongs
    # to devtable.
    self.do_pull('devtable', 'newrepo', 'public', 'password', expected_code=403)

    # Pull the repository as devtable, which should succeed because the repository is owned by
    # devtable.
    self.do_pull('devtable', 'newrepo', 'devtable', 'password')


  def test_public_no_anonymous_access_with_auth(self):
    # Turn off anonymous access.
    with TestFeature(self, 'ANONYMOUS_ACCESS', False):
      # Add a new repository under the public user, so we have a real repository to pull.
      images = [{
        'id': 'onlyimagehere'
      }]
      self.do_push('public', 'newrepo', 'public', 'password', images)
      self.clearSession()

      # First try to pull the (currently private) repo as devtable, which should fail as it belongs
      # to public.
      self.do_pull('public', 'newrepo', 'devtable', 'password', expected_code=403)

      # Make the repository public.
      self.conduct_api_login('public', 'password')
      self.change_repo_visibility('public', 'newrepo', 'public')
      self.clearSession()

      # Pull the repository as devtable, which should succeed because the repository is public.
      self.do_pull('public', 'newrepo', 'devtable', 'password')


  def test_private_no_anonymous_access(self):
    # Turn off anonymous access.
    with TestFeature(self, 'ANONYMOUS_ACCESS', False):
      # Add a new repository under the public user, so we have a real repository to pull.
      images = [{
        'id': 'onlyimagehere'
      }]
      self.do_push('public', 'newrepo', 'public', 'password', images)
      self.clearSession()

      # First try to pull the (currently private) repo as devtable, which should fail as it belongs
      # to public.
      self.do_pull('public', 'newrepo', 'devtable', 'password', expected_code=403)

      # Pull the repository as public, which should succeed because the repository is owned by public.
      self.do_pull('public', 'newrepo', 'public', 'password')


  def test_public_no_anonymous_access_no_auth(self):
    # Turn off anonymous access.
    with TestFeature(self, 'ANONYMOUS_ACCESS', False):
      # Add a new repository under the public user, so we have a real repository to pull.
      images = [{
        'id': 'onlyimagehere'
      }]
      self.do_push('public', 'newrepo', 'public', 'password', images)
      self.clearSession()

      # First try to pull the (currently private) repo as anonymous, which should fail as it
      # is private.
      self.do_pull('public', 'newrepo', expected_code=401)

      # Make the repository public.
      self.conduct_api_login('public', 'password')
      self.change_repo_visibility('public', 'newrepo', 'public')
      self.clearSession()

      # Try again to pull the (currently public) repo as anonymous, which should fail as
      # anonymous access is disabled.
      self.do_pull('public', 'newrepo', expected_code=401)

      # Pull the repository as public, which should succeed because the repository is owned by public.
      self.do_pull('public', 'newrepo', 'public', 'password')

      # Pull the repository as devtable, which should succeed because the repository is public.
      self.do_pull('public', 'newrepo', 'devtable', 'password')


  def test_create_repo_creator_user(self):
    images = [{
      'id': 'onlyimagehere'
    }]
    self.do_push('buynlarge', 'newrepo', 'creator', 'password', images)

    # Pull the repository as devtable, which should succeed because the repository is owned by the
    # org.
    self.do_pull('buynlarge', 'newrepo', 'devtable', 'password')


  def test_create_repo_robot_owner(self):
    # Lookup the robot's password.
    self.conduct_api_login('devtable', 'password')
    resp = self.conduct('GET', '/api/v1/organization/buynlarge/robots/ownerbot')
    robot_token = json.loads(resp.text)['token']

    images = [{
      'id': 'onlyimagehere'
    }]
    self.do_push('buynlarge', 'newrepo', 'buynlarge+ownerbot', robot_token, images)

    # Pull the repository as devtable, which should succeed because the repository is owned by the
    # org.
    self.do_pull('buynlarge', 'newrepo', 'devtable', 'password')


  def test_create_repo_robot_creator(self):
    # Lookup the robot's password.
    self.conduct_api_login('devtable', 'password')
    resp = self.conduct('GET', '/api/v1/organization/buynlarge/robots/creatorbot')
    robot_token = json.loads(resp.text)['token']

    images = [{
      'id': 'onlyimagehere'
    }]
    self.do_push('buynlarge', 'newrepo', 'buynlarge+creatorbot', robot_token, images)

    # Pull the repository as devtable, which should succeed because the repository is owned by the
    # org.
    self.do_pull('buynlarge', 'newrepo', 'devtable', 'password')

if __name__ == '__main__':
  unittest.main()