"""Unittests for the various HTTPServer modules.

Written by Cody A.W. Somerville <cody-somerville@ubuntu.com>,
Josip Dzolonga, and Michael Otteneder for the 2007/08 GHOP contest.
"""

from http.server import BaseHTTPRequestHandler, HTTPServer, \
     SimpleHTTPRequestHandler, CGIHTTPRequestHandler
from http import server

import os
import sys
import re
import base64
import shutil
import urllib.parse
import http.client
import tempfile
import threading

import unittest

from io import BytesIO
from test import support

class NoLogRequestHandler:
    def log_message(self, *args):
        # don't write log messages to stderr
        pass

    def read(self, n=None):
        return ''


class SocketlessRequestHandler(SimpleHTTPRequestHandler):
    def __init__(self):
        self.get_called = False
        self.protocol_version = "HTTP/1.1"

    def do_GET(self):
        self.get_called = True
        self.send_response(200)
        self.send_header('Content-Type', 'text/html')
        self.end_headers()
        self.wfile.write(b'<html><body>Data</body></html>\r\n')

    def log_message(self, format, *args):
        pass

class TestServerThread(threading.Thread):
    def __init__(self, test_object, request_handler):
        threading.Thread.__init__(self)
        self.request_handler = request_handler
        self.test_object = test_object

    def run(self):
        self.server = HTTPServer(('', 0), self.request_handler)
        self.test_object.PORT = self.server.socket.getsockname()[1]
        self.test_object.server_started.set()
        self.test_object = None
        try:
            self.server.serve_forever(0.05)
        finally:
            self.server.server_close()

    def stop(self):
        self.server.shutdown()


class BaseTestCase(unittest.TestCase):
    def setUp(self):
        self.server_started = threading.Event()
        self.thread = TestServerThread(self, self.request_handler)
        self.thread.start()
        self.server_started.wait()

    def tearDown(self):
        self.thread.stop()

    def request(self, uri, method='GET', body=None, headers={}):
        self.connection = http.client.HTTPConnection('localhost', self.PORT)
        self.connection.request(method, uri, body, headers)
        return self.connection.getresponse()

class BaseHTTPRequestHandlerTestCase(unittest.TestCase):
    """Test the functionaility of the BaseHTTPServer."""

    HTTPResponseMatch = re.compile(b'HTTP/1.[0-9]+ 200 OK')

    def setUp (self):
        self.handler = SocketlessRequestHandler()

    def send_typical_request(self, message):
        input = BytesIO(message)
        output = BytesIO()
        self.handler.rfile = input
        self.handler.wfile = output
        self.handler.handle_one_request()
        output.seek(0)
        return output.readlines()

    def verify_get_called(self):
        self.assertTrue(self.handler.get_called)

    def verify_expected_headers(self, headers):
        for fieldName in b'Server: ', b'Date: ', b'Content-Type: ':
            self.assertEqual(sum(h.startswith(fieldName) for h in headers), 1)

    def verify_http_server_response(self, response):
        match = self.HTTPResponseMatch.search(response)
        self.assertTrue(match is not None)

    def test_http_1_1(self):
        result = self.send_typical_request(b'GET / HTTP/1.1\r\n\r\n')
        self.verify_http_server_response(result[0])
        self.verify_expected_headers(result[1:-1])
        self.verify_get_called()
        self.assertEqual(result[-1], b'<html><body>Data</body></html>\r\n')

    def test_http_1_0(self):
        result = self.send_typical_request(b'GET / HTTP/1.0\r\n\r\n')
        self.verify_http_server_response(result[0])
        self.verify_expected_headers(result[1:-1])
        self.verify_get_called()
        self.assertEqual(result[-1], b'<html><body>Data</body></html>\r\n')

    def test_http_0_9(self):
        result = self.send_typical_request(b'GET / HTTP/0.9\r\n\r\n')
        self.assertEqual(len(result), 1)
        self.assertEqual(result[0], b'<html><body>Data</body></html>\r\n')
        self.verify_get_called()

    def test_with_continue_1_0(self):
        result = self.send_typical_request(b'GET / HTTP/1.0\r\nExpect: 100-continue\r\n\r\n')
        self.verify_http_server_response(result[0])
        self.verify_expected_headers(result[1:-1])
        self.verify_get_called()
        self.assertEqual(result[-1], b'<html><body>Data</body></html>\r\n')

    def test_request_length(self):
        # Issue #10714: huge request lines are discarded, to avoid Denial
        # of Service attacks.
        result = self.send_typical_request(b'GET ' + b'x' * 65537)
        self.assertEqual(result[0], b'HTTP/1.1 414 Request-URI Too Long\r\n')
        self.assertFalse(self.handler.get_called)

    def test_header_length(self):
        # Issue #6791: same for headers
        result = self.send_typical_request(
            b'GET / HTTP/1.1\r\nX-Foo: bar' + b'r' * 65537 + b'\r\n\r\n')
        self.assertEqual(result[0], b'HTTP/1.1 400 Line too long\r\n')
        self.assertFalse(self.handler.get_called)


class BaseHTTPServerTestCase(BaseTestCase):
    class request_handler(NoLogRequestHandler, BaseHTTPRequestHandler):
        protocol_version = 'HTTP/1.1'
        default_request_version = 'HTTP/1.1'

        def do_TEST(self):
            self.send_response(204)
            self.send_header('Content-Type', 'text/html')
            self.send_header('Connection', 'close')
            self.end_headers()

        def do_KEEP(self):
            self.send_response(204)
            self.send_header('Content-Type', 'text/html')
            self.send_header('Connection', 'keep-alive')
            self.end_headers()

        def do_KEYERROR(self):
            self.send_error(999)

        def do_CUSTOM(self):
            self.send_response(999)
            self.send_header('Content-Type', 'text/html')
            self.send_header('Connection', 'close')
            self.end_headers()

    def setUp(self):
        BaseTestCase.setUp(self)
        self.con = http.client.HTTPConnection('localhost', self.PORT)
        self.con.connect()

    def test_command(self):
        self.con.request('GET', '/')
        res = self.con.getresponse()
        self.assertEqual(res.status, 501)

    def test_request_line_trimming(self):
        self.con._http_vsn_str = 'HTTP/1.1\n'
        self.con.putrequest('GET', '/')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 501)

    def test_version_bogus(self):
        self.con._http_vsn_str = 'FUBAR'
        self.con.putrequest('GET', '/')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 400)

    def test_version_digits(self):
        self.con._http_vsn_str = 'HTTP/9.9.9'
        self.con.putrequest('GET', '/')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 400)

    def test_version_none_get(self):
        self.con._http_vsn_str = ''
        self.con.putrequest('GET', '/')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 501)

    def test_version_none(self):
        self.con._http_vsn_str = ''
        self.con.putrequest('PUT', '/')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 400)

    def test_version_invalid(self):
        self.con._http_vsn = 99
        self.con._http_vsn_str = 'HTTP/9.9'
        self.con.putrequest('GET', '/')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 505)

    def test_send_blank(self):
        self.con._http_vsn_str = ''
        self.con.putrequest('', '')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 400)

    def test_header_close(self):
        self.con.putrequest('GET', '/')
        self.con.putheader('Connection', 'close')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 501)

    def test_head_keep_alive(self):
        self.con._http_vsn_str = 'HTTP/1.1'
        self.con.putrequest('GET', '/')
        self.con.putheader('Connection', 'keep-alive')
        self.con.endheaders()
        res = self.con.getresponse()
        self.assertEqual(res.status, 501)

    def test_handler(self):
        self.con.request('TEST', '/')
        res = self.con.getresponse()
        self.assertEqual(res.status, 204)

    def test_return_header_keep_alive(self):
        self.con.request('KEEP', '/')
        res = self.con.getresponse()
        self.assertEqual(res.getheader('Connection'), 'keep-alive')
        self.con.request('TEST', '/')

    def test_internal_key_error(self):
        self.con.request('KEYERROR', '/')
        res = self.con.getresponse()
        self.assertEqual(res.status, 999)

    def test_return_custom_status(self):
        self.con.request('CUSTOM', '/')
        res = self.con.getresponse()
        self.assertEqual(res.status, 999)


class SimpleHTTPServerTestCase(BaseTestCase):
    class request_handler(NoLogRequestHandler, SimpleHTTPRequestHandler):
        pass

    def setUp(self):
        BaseTestCase.setUp(self)
        self.cwd = os.getcwd()
        basetempdir = tempfile.gettempdir()
        os.chdir(basetempdir)
        self.data = b'We are the knights who say Ni!'
        self.tempdir = tempfile.mkdtemp(dir=basetempdir)
        self.tempdir_name = os.path.basename(self.tempdir)
        temp = open(os.path.join(self.tempdir, 'test'), 'wb')
        temp.write(self.data)
        temp.close()

    def tearDown(self):
        try:
            os.chdir(self.cwd)
            try:
                shutil.rmtree(self.tempdir)
            except:
                pass
        finally:
            BaseTestCase.tearDown(self)

    def check_status_and_reason(self, response, status, data=None):
        body = response.read()
        self.assertTrue(response)
        self.assertEqual(response.status, status)
        self.assertTrue(response.reason != None)
        if data:
            self.assertEqual(data, body)

    def test_get(self):
        #constructs the path relative to the root directory of the HTTPServer
        response = self.request(self.tempdir_name + '/test')
        self.check_status_and_reason(response, 200, data=self.data)
        response = self.request(self.tempdir_name + '/')
        self.check_status_and_reason(response, 200)
        response = self.request(self.tempdir_name)
        self.check_status_and_reason(response, 301)
        response = self.request('/ThisDoesNotExist')
        self.check_status_and_reason(response, 404)
        response = self.request('/' + 'ThisDoesNotExist' + '/')
        self.check_status_and_reason(response, 404)
        f = open(os.path.join(self.tempdir_name, 'index.html'), 'w')
        response = self.request('/' + self.tempdir_name + '/')
        self.check_status_and_reason(response, 200)
        if os.name == 'posix':
            # chmod won't work as expected on Windows platforms
            os.chmod(self.tempdir, 0)
            response = self.request(self.tempdir_name + '/')
            self.check_status_and_reason(response, 404)
            os.chmod(self.tempdir, 0o755)

    def test_head(self):
        response = self.request(
            self.tempdir_name + '/test', method='HEAD')
        self.check_status_and_reason(response, 200)
        self.assertEqual(response.getheader('content-length'),
                         str(len(self.data)))
        self.assertEqual(response.getheader('content-type'),
                         'application/octet-stream')

    def test_invalid_requests(self):
        response = self.request('/', method='FOO')
        self.check_status_and_reason(response, 501)
        # requests must be case sensitive,so this should fail too
        response = self.request('/', method='get')
        self.check_status_and_reason(response, 501)
        response = self.request('/', method='GETs')
        self.check_status_and_reason(response, 501)


cgi_file1 = """\
#!%s

print("Content-type: text/html")
print()
print("Hello World")
"""

cgi_file2 = """\
#!%s
import cgi

print("Content-type: text/html")
print()

form = cgi.FieldStorage()
print("%%s, %%s, %%s" %% (form.getfirst("spam"), form.getfirst("eggs"),\
              form.getfirst("bacon")))
"""

class CGIHTTPServerTestCase(BaseTestCase):
    class request_handler(NoLogRequestHandler, CGIHTTPRequestHandler):
        pass

    def setUp(self):
        BaseTestCase.setUp(self)
        self.parent_dir = tempfile.mkdtemp()
        self.cgi_dir = os.path.join(self.parent_dir, 'cgi-bin')
        os.mkdir(self.cgi_dir)

        # The shebang line should be pure ASCII: use symlink if possible.
        # See issue #7668.
        if hasattr(os, 'symlink'):
            self.pythonexe = os.path.join(self.parent_dir, 'python')
            os.symlink(sys.executable, self.pythonexe)
        else:
            self.pythonexe = sys.executable

        self.file1_path = os.path.join(self.cgi_dir, 'file1.py')
        with open(self.file1_path, 'w') as file1:
            file1.write(cgi_file1 % self.pythonexe)
        os.chmod(self.file1_path, 0o777)

        self.file2_path = os.path.join(self.cgi_dir, 'file2.py')
        with open(self.file2_path, 'w') as file2:
            file2.write(cgi_file2 % self.pythonexe)
        os.chmod(self.file2_path, 0o777)

        self.cwd = os.getcwd()
        os.chdir(self.parent_dir)

    def tearDown(self):
        try:
            os.chdir(self.cwd)
            if self.pythonexe != sys.executable:
                os.remove(self.pythonexe)
            os.remove(self.file1_path)
            os.remove(self.file2_path)
            os.rmdir(self.cgi_dir)
            os.rmdir(self.parent_dir)
        finally:
            BaseTestCase.tearDown(self)

    def test_url_collapse_path_split(self):
        test_vectors = {
            '': ('/', ''),
            '..': IndexError,
            '/.//..': IndexError,
            '/': ('/', ''),
            '//': ('/', ''),
            '/\\': ('/', '\\'),
            '/.//': ('/', ''),
            'cgi-bin/file1.py': ('/cgi-bin', 'file1.py'),
            '/cgi-bin/file1.py': ('/cgi-bin', 'file1.py'),
            'a': ('/', 'a'),
            '/a': ('/', 'a'),
            '//a': ('/', 'a'),
            './a': ('/', 'a'),
            './C:/': ('/C:', ''),
            '/a/b': ('/a', 'b'),
            '/a/b/': ('/a/b', ''),
            '/a/b/c/..': ('/a/b', ''),
            '/a/b/c/../d': ('/a/b', 'd'),
            '/a/b/c/../d/e/../f': ('/a/b/d', 'f'),
            '/a/b/c/../d/e/../../f': ('/a/b', 'f'),
            '/a/b/c/../d/e/.././././..//f': ('/a/b', 'f'),
            '../a/b/c/../d/e/.././././..//f': IndexError,
            '/a/b/c/../d/e/../../../f': ('/a', 'f'),
            '/a/b/c/../d/e/../../../../f': ('/', 'f'),
            '/a/b/c/../d/e/../../../../../f': IndexError,
            '/a/b/c/../d/e/../../../../f/..': ('/', ''),
        }
        for path, expected in test_vectors.items():
            if isinstance(expected, type) and issubclass(expected, Exception):
                self.assertRaises(expected,
                                  server._url_collapse_path_split, path)
            else:
                actual = server._url_collapse_path_split(path)
                self.assertEqual(expected, actual,
                                 msg='path = %r\nGot:    %r\nWanted: %r' % (
                                 path, actual, expected))

    def test_headers_and_content(self):
        res = self.request('/cgi-bin/file1.py')
        self.assertEqual((b'Hello World\n', 'text/html', 200), \
             (res.read(), res.getheader('Content-type'), res.status))

    def test_post(self):
        params = urllib.parse.urlencode(
            {'spam' : 1, 'eggs' : 'python', 'bacon' : 123456})
        headers = {'Content-type' : 'application/x-www-form-urlencoded'}
        res = self.request('/cgi-bin/file2.py', 'POST', params, headers)

        self.assertEqual(res.read(), b'1, python, 123456\n')

    def test_invaliduri(self):
        res = self.request('/cgi-bin/invalid')
        res.read()
        self.assertEqual(res.status, 404)

    def test_authorization(self):
        headers = {b'Authorization' : b'Basic ' +
                   base64.b64encode(b'username:pass')}
        res = self.request('/cgi-bin/file1.py', 'GET', headers=headers)
        self.assertEqual((b'Hello World\n', 'text/html', 200), \
             (res.read(), res.getheader('Content-type'), res.status))

    def test_no_leading_slash(self):
        # http://bugs.python.org/issue2254
        res = self.request('cgi-bin/file1.py')
        self.assertEqual((b'Hello World\n', 'text/html', 200),
             (res.read(), res.getheader('Content-type'), res.status))

    def test_os_environ_is_not_altered(self):
        signature = "Test CGI Server"
        os.environ['SERVER_SOFTWARE'] = signature
        res = self.request('/cgi-bin/file1.py')
        self.assertEqual((b'Hello World\n', 'text/html', 200),
                (res.read(), res.getheader('Content-type'), res.status))
        self.assertEqual(os.environ['SERVER_SOFTWARE'], signature)


class SimpleHTTPRequestHandlerTestCase(unittest.TestCase):
    """ Test url parsing """
    def setUp(self):
        self.translated = os.getcwd()
        self.translated = os.path.join(self.translated, 'filename')
        self.handler = SocketlessRequestHandler()

    def test_query_arguments(self):
        path = self.handler.translate_path('/filename')
        self.assertEqual(path, self.translated)
        path = self.handler.translate_path('/filename?foo=bar')
        self.assertEqual(path, self.translated)
        path = self.handler.translate_path('/filename?a=b&spam=eggs#zot')
        self.assertEqual(path, self.translated)

    def test_start_with_double_slash(self):
        path = self.handler.translate_path('//filename')
        self.assertEqual(path, self.translated)
        path = self.handler.translate_path('//filename?foo=bar')
        self.assertEqual(path, self.translated)


def test_main(verbose=None):
    try:
        cwd = os.getcwd()
        support.run_unittest(BaseHTTPRequestHandlerTestCase,
                             SimpleHTTPRequestHandlerTestCase,
                             BaseHTTPServerTestCase,
                             SimpleHTTPServerTestCase,
                             CGIHTTPServerTestCase
                             )
    finally:
        os.chdir(cwd)

if __name__ == '__main__':
    test_main()