import unittest

from scrapy.http import Request
from scrapy.downloadermiddlewares.auth import AuthMiddleware
from scrapy.spiders import Spider


class TestSpider(Spider):
    http_user = 'foo'
    http_pass = 'bar'


class AuthMiddlewareTest(unittest.TestCase):

    def setUp(self):
        self.mw = AuthMiddleware()
        self.spider = TestSpider('foo')
        self.mw.spider_opened(self.spider)

    def tearDown(self):
        del self.mw

    def test_auth(self):
        req = Request('http://scrapytest.org/')
        assert self.mw.process_request(req, self.spider) is None
        self.assertEquals(req.headers['Authorization'], b'Basic Zm9vOmJhcg==')

    def test_auth_already_set(self):
        req = Request('http://scrapytest.org/',
                      headers=dict(Authorization='Digest 123'))
        assert self.mw.process_request(req, self.spider) is None
        self.assertEquals(req.headers['Authorization'], b'Digest 123')

    def test_auth_from_http_url(self):
        req = Request('http://username:password@scrapytest.org/')
        new_req = self.mw.process_request(req, self.spider)
        assert new_req is not None
        self.assertEquals(new_req.headers['Authorization'], b'Basic dXNlcm5hbWU6cGFzc3dvcmQ=')
        self.assertEquals(new_req.url, 'http://scrapytest.org/')

    def test_auth_from_ftp_url(self):
        req = Request('ftp://username:password@scrapytest.org/')
        new_req = self.mw.process_request(req, self.spider)
        assert new_req is not None
        self.assertIn('ftp_user', new_req.meta)
        self.assertIn('ftp_password', new_req.meta)
        self.assertNotIn('@', new_req.url)