import unittest
from time import sleep
import uuid
import socket
import requests
import os

TEST_SERVER = 'sovereign.local'
TEST_ADDRESS = 'sovereign@sovereign.local'
TEST_PASSWORD = 'foo'
CA_BUNDLE = 'roles/common/files/wildcard_ca.pem'


socket.setdefaulttimeout(5)
os.environ['REQUESTS_CA_BUNDLE'] = CA_BUNDLE


class SSHTests(unittest.TestCase):
    def test_ssh_banner(self):
        """SSH is responding with its banner"""
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((TEST_SERVER, 22))
        data = s.recv(1024)
        s.close()

        self.assertRegexpMatches(data, '^SSH-2.0-OpenSSH')


class WebTests(unittest.TestCase):
    def test_blog_http(self):
        """Blog is redirecting to https"""
        # FIXME: requests won't verify sovereign.local with *.sovereign.local cert
        r = requests.get('http://' + TEST_SERVER, verify=False)

        # We should be redirected to https
        self.assertEquals(r.history[0].status_code, 301)
        self.assertEquals(r.url, 'https://' + TEST_SERVER + '/')

        # 403 - Since there is no documents in the blog directory
        self.assertEquals(r.status_code, 403)

    def test_webmail_http(self):
        """Webmail is redirecting to https and displaying login page"""
        r = requests.get('http://mail.' + TEST_SERVER)

        # We should be redirected to https
        self.assertEquals(r.history[0].status_code, 301)
        self.assertEquals(r.url, 'https://mail.' + TEST_SERVER + '/')

        # 200 - We should be at the login page
        self.assertEquals(r.status_code, 200)
        self.assertIn(
            'Welcome to Roundcube Webmail',
            r.content
        )

    def test_owncloud_http(self):
        """ownCloud is redirecting to https and displaying login page"""
        r = requests.get('http://cloud.' + TEST_SERVER)

        # We should be redirected to https
        self.assertEquals(r.history[0].status_code, 301)
        self.assertEquals(r.url, 'https://cloud.' + TEST_SERVER + '/')

        # 200 - We should be at the login page
        self.assertEquals(r.status_code, 200)
        self.assertIn(
            'ownCloud',
            r.content
        )

    def test_znc_http(self):
        """ZNC web interface is displaying login page"""
        # FIXME: requests won't verify sovereign.local with *.sovereign.local cert
        r = requests.get('https://' + TEST_SERVER + ':6697', verify=False)
        self.assertEquals(r.status_code, 200)
        self.assertIn(
            "Welcome to ZNC's web interface!",
            r.content
        )


class IRCTests(unittest.TestCase):
    def test_irc_auth(self):
        """ZNC is accepting encrypted logins"""
        import ssl
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        ssl_sock = ssl.wrap_socket(s, ca_certs=CA_BUNDLE, cert_reqs=ssl.CERT_REQUIRED)
        ssl_sock.connect((TEST_SERVER, 6697))

        # Check the encryption parameters
        cipher, version, bits = ssl_sock.cipher()
        self.assertEquals(cipher, 'AES256-SHA')
        self.assertEquals(version, 'TLSv1/SSLv3')
        self.assertEquals(bits, 256)

        # Login
        ssl_sock.send('CAP REQ sasl multi-prefix\r\n')
        ssl_sock.send('PASS foo\r\n')
        ssl_sock.send('NICK sovereign\r\n')
        ssl_sock.send('USER sovereign 0 * Sov\r\n')

        # Read until we see the ZNC banner (or timeout)
        while 1:
            r = ssl_sock.recv(1024)
            if 'Connected to ZNC' in r:
                break


def new_message(from_email, to_email):
    """Creates an email (headers & body) with a random subject"""
    from email.mime.text import MIMEText
    msg = MIMEText('Testing')
    msg['Subject'] = uuid.uuid4().hex[:8]
    msg['From'] = from_email
    msg['To'] = to_email
    return msg.as_string(), msg['subject']


class MailTests(unittest.TestCase):
    def assertEmailReceived(self, subject):
        """Connects with IMAP and asserts the existance of an email, then deletes it"""
        import imaplib

        sleep(1)

        # Login to IMAP
        m = imaplib.IMAP4_SSL(TEST_SERVER, 993)
        m.login(TEST_ADDRESS, TEST_PASSWORD)
        m.select()

        # Assert the message exist
        typ, data = m.search(None, '(SUBJECT \"{}\")'.format(subject))
        self.assertTrue(len(data[0].split()), 1)

        # Delete it & logout
        m.store(data[0].strip(), '+FLAGS', '\\Deleted')
        m.expunge()
        m.close()
        m.logout()

    def test_imap_requires_ssl(self):
        """IMAP without SSL is NOT available"""
        import imaplib

        with self.assertRaisesRegexp(socket.timeout, 'timed out'):
            imaplib.IMAP4(TEST_SERVER, 143)

    def test_smtps(self):
        """Email sent from an MUA via SMTPS is delivered"""
        import smtplib
        msg, subject = new_message(TEST_ADDRESS, 'root@sovereign.local')
        s = smtplib.SMTP_SSL(TEST_SERVER, 465)
        s.login(TEST_ADDRESS, TEST_PASSWORD)
        s.sendmail(TEST_ADDRESS, ['root@sovereign.local'], msg)
        s.quit()
        self.assertEmailReceived(subject)

    def test_smtps_requires_auth(self):
        """SMTPS with no authentication is rejected"""
        import smtplib
        s = smtplib.SMTP_SSL(TEST_SERVER, 465)

        with self.assertRaisesRegexp(smtplib.SMTPRecipientsRefused, 'Access denied'):
            s.sendmail(TEST_ADDRESS, ['root@sovereign.local'], 'Test')

        s.quit()

    def test_smtp(self):
        """Email sent from an MTA is delivered"""
        import smtplib
        msg, subject = new_message('someone@example.com', TEST_ADDRESS)
        s = smtplib.SMTP(TEST_SERVER, 25)
        s.sendmail('someone@example.com', [TEST_ADDRESS], msg)
        s.quit()
        self.assertEmailReceived(subject)

    def test_smtp_tls(self):
        """Email sent from an MTA via SMTP+TLS is delivered"""
        import smtplib
        msg, subject = new_message('someone@example.com', TEST_ADDRESS)
        s = smtplib.SMTP(TEST_SERVER, 25)
        s.starttls()
        s.sendmail('someone@example.com', [TEST_ADDRESS], msg)
        s.quit()
        self.assertEmailReceived(subject)

    def test_smtps_headers(self):
        """Email sent from an MUA has DKIM and TLS headers"""
        import smtplib
        import imaplib

        # Send a message to root
        msg, subject = new_message(TEST_ADDRESS, 'root@sovereign.local')
        s = smtplib.SMTP_SSL(TEST_SERVER, 465)
        s.login(TEST_ADDRESS, TEST_PASSWORD)
        s.sendmail(TEST_ADDRESS, ['root@sovereign.local'], msg)
        s.quit()

        sleep(1)

        # Get the message
        m = imaplib.IMAP4_SSL(TEST_SERVER, 993)
        m.login(TEST_ADDRESS, TEST_PASSWORD)
        m.select()
        _, res = m.search(None, '(SUBJECT \"{}\")'.format(subject))
        _, data = m.fetch(res[0], '(RFC822)')

        self.assertIn(
            'DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sovereign.local;',
            data[0][1]
        )

        self.assertIn(
            '(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))',
            data[0][1]
        )

        # Clean up
        m.store(res[0].strip(), '+FLAGS', '\\Deleted')
        m.expunge()
        m.close()
        m.logout()

    def test_smtp_headers(self):
        """Email sent from an MTA via SMTP+TLS has X-DSPAM and TLS headers"""
        import smtplib
        import imaplib

        # Send a message to root
        msg, subject = new_message('someone@example.com', TEST_ADDRESS)
        s = smtplib.SMTP(TEST_SERVER, 25)
        s.starttls()
        s.sendmail('someone@example.com', [TEST_ADDRESS], msg)
        s.quit()

        sleep(1)

        # Get the message
        m = imaplib.IMAP4_SSL(TEST_SERVER, 993)
        m.login(TEST_ADDRESS, TEST_PASSWORD)
        m.select()
        _, res = m.search(None, '(SUBJECT \"{}\")'.format(subject))
        _, data = m.fetch(res[0], '(RFC822)')

        self.assertIn(
            'X-DSPAM-Result: Innocent',
            data[0][1]
        )

        self.assertIn(
            '(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))',
            data[0][1]
        )

        # Clean up
        m.store(res[0].strip(), '+FLAGS', '\\Deleted')
        m.expunge()
        m.close()
        m.logout()