from __future__ import unicode_literals

import time
import warnings
from datetime import datetime, timedelta
from io import BytesIO

from django.conf import settings
from django.core.exceptions import SuspiciousOperation
from django.core.handlers.wsgi import WSGIRequest, LimitedStream
from django.http import HttpRequest, HttpResponse, parse_cookie, build_request_repr, UnreadablePostError
from django.test.utils import str_prefix
from django.utils import unittest
from django.utils.http import cookie_date
from django.utils.timezone import utc


class RequestsTests(unittest.TestCase):
    def test_httprequest(self):
        request = HttpRequest()
        self.assertEqual(list(request.GET.keys()), [])
        self.assertEqual(list(request.POST.keys()), [])
        self.assertEqual(list(request.COOKIES.keys()), [])
        self.assertEqual(list(request.META.keys()), [])

    def test_httprequest_repr(self):
        request = HttpRequest()
        request.path = '/somepath/'
        request.GET = {'get-key': 'get-value'}
        request.POST = {'post-key': 'post-value'}
        request.COOKIES = {'post-key': 'post-value'}
        request.META = {'post-key': 'post-value'}
        self.assertEqual(repr(request), str_prefix("<HttpRequest\npath:/somepath/,\nGET:{%(_)s'get-key': %(_)s'get-value'},\nPOST:{%(_)s'post-key': %(_)s'post-value'},\nCOOKIES:{%(_)s'post-key': %(_)s'post-value'},\nMETA:{%(_)s'post-key': %(_)s'post-value'}>"))
        self.assertEqual(build_request_repr(request), repr(request))
        self.assertEqual(build_request_repr(request, path_override='/otherpath/', GET_override={'a': 'b'}, POST_override={'c': 'd'}, COOKIES_override={'e': 'f'}, META_override={'g': 'h'}),
                         str_prefix("<HttpRequest\npath:/otherpath/,\nGET:{%(_)s'a': %(_)s'b'},\nPOST:{%(_)s'c': %(_)s'd'},\nCOOKIES:{%(_)s'e': %(_)s'f'},\nMETA:{%(_)s'g': %(_)s'h'}>"))

    def test_wsgirequest(self):
        request = WSGIRequest({'PATH_INFO': 'bogus', 'REQUEST_METHOD': 'bogus', 'wsgi.input': BytesIO(b'')})
        self.assertEqual(list(request.GET.keys()), [])
        self.assertEqual(list(request.POST.keys()), [])
        self.assertEqual(list(request.COOKIES.keys()), [])
        self.assertEqual(set(request.META.keys()), set(['PATH_INFO', 'REQUEST_METHOD', 'SCRIPT_NAME', 'wsgi.input']))
        self.assertEqual(request.META['PATH_INFO'], 'bogus')
        self.assertEqual(request.META['REQUEST_METHOD'], 'bogus')
        self.assertEqual(request.META['SCRIPT_NAME'], '')

    def test_wsgirequest_repr(self):
        request = WSGIRequest({'PATH_INFO': '/somepath/', 'REQUEST_METHOD': 'get', 'wsgi.input': BytesIO(b'')})
        request.GET = {'get-key': 'get-value'}
        request.POST = {'post-key': 'post-value'}
        request.COOKIES = {'post-key': 'post-value'}
        request.META = {'post-key': 'post-value'}
        self.assertEqual(repr(request), str_prefix("<WSGIRequest\npath:/somepath/,\nGET:{%(_)s'get-key': %(_)s'get-value'},\nPOST:{%(_)s'post-key': %(_)s'post-value'},\nCOOKIES:{%(_)s'post-key': %(_)s'post-value'},\nMETA:{%(_)s'post-key': %(_)s'post-value'}>"))
        self.assertEqual(build_request_repr(request), repr(request))
        self.assertEqual(build_request_repr(request, path_override='/otherpath/', GET_override={'a': 'b'}, POST_override={'c': 'd'}, COOKIES_override={'e': 'f'}, META_override={'g': 'h'}),
                         str_prefix("<WSGIRequest\npath:/otherpath/,\nGET:{%(_)s'a': %(_)s'b'},\nPOST:{%(_)s'c': %(_)s'd'},\nCOOKIES:{%(_)s'e': %(_)s'f'},\nMETA:{%(_)s'g': %(_)s'h'}>"))

    def test_parse_cookie(self):
        self.assertEqual(parse_cookie('invalid:key=true'), {})

    def test_httprequest_location(self):
        request = HttpRequest()
        self.assertEqual(request.build_absolute_uri(location="https://www.example.com/asdf"),
            'https://www.example.com/asdf')

        request.get_host = lambda: 'www.example.com'
        request.path = ''
        self.assertEqual(request.build_absolute_uri(location="/path/with:colons"),
            'http://www.example.com/path/with:colons')

    def test_http_get_host(self):
        old_USE_X_FORWARDED_HOST = settings.USE_X_FORWARDED_HOST
        try:
            settings.USE_X_FORWARDED_HOST = False

            # Check if X_FORWARDED_HOST is provided.
            request = HttpRequest()
            request.META = {
                'HTTP_X_FORWARDED_HOST': 'forward.com',
                'HTTP_HOST': 'example.com',
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 80,
            }
            # X_FORWARDED_HOST is ignored.
            self.assertEqual(request.get_host(), 'example.com')

            # Check if X_FORWARDED_HOST isn't provided.
            request = HttpRequest()
            request.META = {
                'HTTP_HOST': 'example.com',
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 80,
            }
            self.assertEqual(request.get_host(), 'example.com')

            # Check if HTTP_HOST isn't provided.
            request = HttpRequest()
            request.META = {
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 80,
            }
            self.assertEqual(request.get_host(), 'internal.com')

            # Check if HTTP_HOST isn't provided, and we're on a nonstandard port
            request = HttpRequest()
            request.META = {
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 8042,
            }
            self.assertEqual(request.get_host(), 'internal.com:8042')

            # Poisoned host headers are rejected as suspicious
            legit_hosts = [
                'example.com',
                'example.com:80',
                '12.34.56.78',
                '12.34.56.78:443',
                '[2001:19f0:feee::dead:beef:cafe]',
                '[2001:19f0:feee::dead:beef:cafe]:8080',
            ]

            poisoned_hosts = [
                'example.com@evil.tld',
                'example.com:dr.frankenstein@evil.tld',
                'example.com:someone@somestie.com:80',
                'example.com:80/badpath'
            ]

            for host in legit_hosts:
                request = HttpRequest()
                request.META = {
                    'HTTP_HOST': host,
                }
                request.get_host()

            for host in poisoned_hosts:
                with self.assertRaises(SuspiciousOperation):
                    request = HttpRequest()
                    request.META = {
                        'HTTP_HOST': host,
                    }
                    request.get_host()

        finally:
            settings.USE_X_FORWARDED_HOST = old_USE_X_FORWARDED_HOST

    def test_http_get_host_with_x_forwarded_host(self):
        old_USE_X_FORWARDED_HOST = settings.USE_X_FORWARDED_HOST
        try:
            settings.USE_X_FORWARDED_HOST = True

            # Check if X_FORWARDED_HOST is provided.
            request = HttpRequest()
            request.META = {
                'HTTP_X_FORWARDED_HOST': 'forward.com',
                'HTTP_HOST': 'example.com',
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 80,
            }
            # X_FORWARDED_HOST is obeyed.
            self.assertEqual(request.get_host(), 'forward.com')

            # Check if X_FORWARDED_HOST isn't provided.
            request = HttpRequest()
            request.META = {
                'HTTP_HOST': 'example.com',
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 80,
            }
            self.assertEqual(request.get_host(), 'example.com')

            # Check if HTTP_HOST isn't provided.
            request = HttpRequest()
            request.META = {
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 80,
            }
            self.assertEqual(request.get_host(), 'internal.com')

            # Check if HTTP_HOST isn't provided, and we're on a nonstandard port
            request = HttpRequest()
            request.META = {
                'SERVER_NAME': 'internal.com',
                'SERVER_PORT': 8042,
            }
            self.assertEqual(request.get_host(), 'internal.com:8042')

            # Poisoned host headers are rejected as suspicious
            legit_hosts = [
                'example.com',
                'example.com:80',
                '12.34.56.78',
                '12.34.56.78:443',
                '[2001:19f0:feee::dead:beef:cafe]',
                '[2001:19f0:feee::dead:beef:cafe]:8080',
            ]

            poisoned_hosts = [
                'example.com@evil.tld',
                'example.com:dr.frankenstein@evil.tld',
                'example.com:dr.frankenstein@evil.tld:80',
                'example.com:80/badpath'
            ]

            for host in legit_hosts:
                request = HttpRequest()
                request.META = {
                    'HTTP_HOST': host,
                }
                request.get_host()

            for host in poisoned_hosts:
                with self.assertRaises(SuspiciousOperation):
                    request = HttpRequest()
                    request.META = {
                        'HTTP_HOST': host,
                    }
                    request.get_host()

        finally:
            settings.USE_X_FORWARDED_HOST = old_USE_X_FORWARDED_HOST

    def test_near_expiration(self):
        "Cookie will expire when an near expiration time is provided"
        response = HttpResponse()
        # There is a timing weakness in this test; The
        # expected result for max-age requires that there be
        # a very slight difference between the evaluated expiration
        # time, and the time evaluated in set_cookie(). If this
        # difference doesn't exist, the cookie time will be
        # 1 second larger. To avoid the problem, put in a quick sleep,
        # which guarantees that there will be a time difference.
        expires = datetime.utcnow() + timedelta(seconds=10)
        time.sleep(0.001)
        response.set_cookie('datetime', expires=expires)
        datetime_cookie = response.cookies['datetime']
        self.assertEqual(datetime_cookie['max-age'], 10)

    def test_aware_expiration(self):
        "Cookie accepts an aware datetime as expiration time"
        response = HttpResponse()
        expires = (datetime.utcnow() + timedelta(seconds=10)).replace(tzinfo=utc)
        time.sleep(0.001)
        response.set_cookie('datetime', expires=expires)
        datetime_cookie = response.cookies['datetime']
        self.assertEqual(datetime_cookie['max-age'], 10)

    def test_far_expiration(self):
        "Cookie will expire when an distant expiration time is provided"
        response = HttpResponse()
        response.set_cookie('datetime', expires=datetime(2028, 1, 1, 4, 5, 6))
        datetime_cookie = response.cookies['datetime']
        self.assertEqual(datetime_cookie['expires'], 'Sat, 01-Jan-2028 04:05:06 GMT')

    def test_max_age_expiration(self):
        "Cookie will expire if max_age is provided"
        response = HttpResponse()
        response.set_cookie('max_age', max_age=10)
        max_age_cookie = response.cookies['max_age']
        self.assertEqual(max_age_cookie['max-age'], 10)
        self.assertEqual(max_age_cookie['expires'], cookie_date(time.time()+10))

    def test_httponly_cookie(self):
        response = HttpResponse()
        response.set_cookie('example', httponly=True)
        example_cookie = response.cookies['example']
        # A compat cookie may be in use -- check that it has worked
        # both as an output string, and using the cookie attributes
        self.assertTrue('; httponly' in str(example_cookie))
        self.assertTrue(example_cookie['httponly'])

    def test_limited_stream(self):
        # Read all of a limited stream
        stream = LimitedStream(BytesIO(b'test'), 2)
        self.assertEqual(stream.read(), b'te')
        # Reading again returns nothing.
        self.assertEqual(stream.read(), b'')

        # Read a number of characters greater than the stream has to offer
        stream = LimitedStream(BytesIO(b'test'), 2)
        self.assertEqual(stream.read(5), b'te')
        # Reading again returns nothing.
        self.assertEqual(stream.readline(5), b'')

        # Read sequentially from a stream
        stream = LimitedStream(BytesIO(b'12345678'), 8)
        self.assertEqual(stream.read(5), b'12345')
        self.assertEqual(stream.read(5), b'678')
        # Reading again returns nothing.
        self.assertEqual(stream.readline(5), b'')

        # Read lines from a stream
        stream = LimitedStream(BytesIO(b'1234\n5678\nabcd\nefgh\nijkl'), 24)
        # Read a full line, unconditionally
        self.assertEqual(stream.readline(), b'1234\n')
        # Read a number of characters less than a line
        self.assertEqual(stream.readline(2), b'56')
        # Read the rest of the partial line
        self.assertEqual(stream.readline(), b'78\n')
        # Read a full line, with a character limit greater than the line length
        self.assertEqual(stream.readline(6), b'abcd\n')
        # Read the next line, deliberately terminated at the line end
        self.assertEqual(stream.readline(4), b'efgh')
        # Read the next line... just the line end
        self.assertEqual(stream.readline(), b'\n')
        # Read everything else.
        self.assertEqual(stream.readline(), b'ijkl')

        # Regression for #15018
        # If a stream contains a newline, but the provided length
        # is less than the number of provided characters, the newline
        # doesn't reset the available character count
        stream = LimitedStream(BytesIO(b'1234\nabcdef'), 9)
        self.assertEqual(stream.readline(10), b'1234\n')
        self.assertEqual(stream.readline(3), b'abc')
        # Now expire the available characters
        self.assertEqual(stream.readline(3), b'd')
        # Reading again returns nothing.
        self.assertEqual(stream.readline(2), b'')

        # Same test, but with read, not readline.
        stream = LimitedStream(BytesIO(b'1234\nabcdef'), 9)
        self.assertEqual(stream.read(6), b'1234\na')
        self.assertEqual(stream.read(2), b'bc')
        self.assertEqual(stream.read(2), b'd')
        self.assertEqual(stream.read(2), b'')
        self.assertEqual(stream.read(), b'')

    def test_stream(self):
        payload = b'name=value'
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'application/x-www-form-urlencoded',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        self.assertEqual(request.read(), b'name=value')

    def test_read_after_value(self):
        """
        Reading from request is allowed after accessing request contents as
        POST or body.
        """
        payload = b'name=value'
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'application/x-www-form-urlencoded',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        self.assertEqual(request.POST, {'name': ['value']})
        self.assertEqual(request.body, b'name=value')
        self.assertEqual(request.read(), b'name=value')

    def test_value_after_read(self):
        """
        Construction of POST or body is not allowed after reading
        from request.
        """
        payload = b'name=value'
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'application/x-www-form-urlencoded',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        self.assertEqual(request.read(2), b'na')
        self.assertRaises(Exception, lambda: request.body)
        self.assertEqual(request.POST, {})

    def test_body_after_POST_multipart(self):
        """
        Reading body after parsing multipart is not allowed
        """
        # Because multipart is used for large amounts fo data i.e. file uploads,
        # we don't want the data held in memory twice, and we don't want to
        # silence the error by setting body = '' either.
        payload = "\r\n".join([
                '--boundary',
                'Content-Disposition: form-data; name="name"',
                '',
                'value',
                '--boundary--'
                '']).encode('utf-8')
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'multipart/form-data; boundary=boundary',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        self.assertEqual(request.POST, {'name': ['value']})
        self.assertRaises(Exception, lambda: request.body)

    def test_POST_multipart_with_content_length_zero(self):
        """
        Multipart POST requests with Content-Length >= 0 are valid and need to be handled.
        """
        # According to:
        # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13
        # Every request.POST with Content-Length >= 0 is a valid request,
        # this test ensures that we handle Content-Length == 0.
        payload = "\r\n".join([
                '--boundary',
                'Content-Disposition: form-data; name="name"',
                '',
                'value',
                '--boundary--'
                '']).encode('utf-8')
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'multipart/form-data; boundary=boundary',
                               'CONTENT_LENGTH': 0,
                               'wsgi.input': BytesIO(payload)})
        self.assertEqual(request.POST, {})

    def test_POST_binary_only(self):
        payload = b'\r\n\x01\x00\x00\x00ab\x00\x00\xcd\xcc,@'
        environ = {'REQUEST_METHOD': 'POST',
                   'CONTENT_TYPE': 'application/octet-stream',
                   'CONTENT_LENGTH': len(payload),
                   'wsgi.input': BytesIO(payload)}
        request = WSGIRequest(environ)
        self.assertEqual(request.POST, {})
        self.assertEqual(request.FILES, {})
        self.assertEqual(request.body, payload)

        # Same test without specifying content-type
        environ.update({'CONTENT_TYPE': '', 'wsgi.input': BytesIO(payload)})
        request = WSGIRequest(environ)
        self.assertEqual(request.POST, {})
        self.assertEqual(request.FILES, {})
        self.assertEqual(request.body, payload)

    def test_read_by_lines(self):
        payload = b'name=value'
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'application/x-www-form-urlencoded',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        self.assertEqual(list(request), [b'name=value'])

    def test_POST_after_body_read(self):
        """
        POST should be populated even if body is read first
        """
        payload = b'name=value'
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'application/x-www-form-urlencoded',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        raw_data = request.body
        self.assertEqual(request.POST, {'name': ['value']})

    def test_POST_after_body_read_and_stream_read(self):
        """
        POST should be populated even if body is read first, and then
        the stream is read second.
        """
        payload = b'name=value'
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'application/x-www-form-urlencoded',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        raw_data = request.body
        self.assertEqual(request.read(1), b'n')
        self.assertEqual(request.POST, {'name': ['value']})

    def test_POST_after_body_read_and_stream_read_multipart(self):
        """
        POST should be populated even if body is read first, and then
        the stream is read second. Using multipart/form-data instead of urlencoded.
        """
        payload = "\r\n".join([
                '--boundary',
                'Content-Disposition: form-data; name="name"',
                '',
                'value',
                '--boundary--'
                '']).encode('utf-8')
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'multipart/form-data; boundary=boundary',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': BytesIO(payload)})
        raw_data = request.body
        # Consume enough data to mess up the parsing:
        self.assertEqual(request.read(13), b'--boundary\r\nC')
        self.assertEqual(request.POST, {'name': ['value']})

    def test_raw_post_data_returns_body(self):
        """
        HttpRequest.raw_post_body should be the same as HttpRequest.body
        """
        payload = b'Hello There!'
        request = WSGIRequest({
            'REQUEST_METHOD': 'POST',
            'CONTENT_LENGTH': len(payload),
            'wsgi.input': BytesIO(payload)
        })

        with warnings.catch_warnings(record=True):
            self.assertEqual(request.body, request.raw_post_data)

    def test_POST_connection_error(self):
        """
        If wsgi.input.read() raises an exception while trying to read() the
        POST, the exception should be identifiable (not a generic IOError).
        """
        class ExplodingBytesIO(BytesIO):
            def read(self, len=0):
                raise IOError("kaboom!")

        payload = b'name=value'
        request = WSGIRequest({'REQUEST_METHOD': 'POST',
                               'CONTENT_TYPE': 'application/x-www-form-urlencoded',
                               'CONTENT_LENGTH': len(payload),
                               'wsgi.input': ExplodingBytesIO(payload)})

        with warnings.catch_warnings(record=True) as w:
            warnings.simplefilter("always")
            with self.assertRaises(UnreadablePostError):
                request.raw_post_data
            self.assertEqual(len(w), 1)