# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, print_function

from tornado.httputil import (
    url_concat, parse_multipart_form_data, HTTPHeaders, format_timestamp,
    HTTPServerRequest, parse_request_start_line, parse_cookie, qs_to_qsl,
    HTTPInputError,
)
from tornado.escape import utf8, native_str
from tornado.util import PY3
from tornado.log import gen_log
from tornado.testing import ExpectLog
from tornado.test.util import unittest

import copy
import datetime
import logging
import pickle
import time

if PY3:
    import urllib.parse as urllib_parse
else:
    import urlparse as urllib_parse


class TestUrlConcat(unittest.TestCase):
    def test_url_concat_no_query_params(self):
        url = url_concat(
            "https://localhost/path",
            [('y', 'y'), ('z', 'z')],
        )
        self.assertEqual(url, "https://localhost/path?y=y&z=z")

    def test_url_concat_encode_args(self):
        url = url_concat(
            "https://localhost/path",
            [('y', '/y'), ('z', 'z')],
        )
        self.assertEqual(url, "https://localhost/path?y=%2Fy&z=z")

    def test_url_concat_trailing_q(self):
        url = url_concat(
            "https://localhost/path?",
            [('y', 'y'), ('z', 'z')],
        )
        self.assertEqual(url, "https://localhost/path?y=y&z=z")

    def test_url_concat_q_with_no_trailing_amp(self):
        url = url_concat(
            "https://localhost/path?x",
            [('y', 'y'), ('z', 'z')],
        )
        self.assertEqual(url, "https://localhost/path?x=&y=y&z=z")

    def test_url_concat_trailing_amp(self):
        url = url_concat(
            "https://localhost/path?x&",
            [('y', 'y'), ('z', 'z')],
        )
        self.assertEqual(url, "https://localhost/path?x=&y=y&z=z")

    def test_url_concat_mult_params(self):
        url = url_concat(
            "https://localhost/path?a=1&b=2",
            [('y', 'y'), ('z', 'z')],
        )
        self.assertEqual(url, "https://localhost/path?a=1&b=2&y=y&z=z")

    def test_url_concat_no_params(self):
        url = url_concat(
            "https://localhost/path?r=1&t=2",
            [],
        )
        self.assertEqual(url, "https://localhost/path?r=1&t=2")

    def test_url_concat_none_params(self):
        url = url_concat(
            "https://localhost/path?r=1&t=2",
            None,
        )
        self.assertEqual(url, "https://localhost/path?r=1&t=2")

    def test_url_concat_with_frag(self):
        url = url_concat(
            "https://localhost/path#tab",
            [('y', 'y')],
        )
        self.assertEqual(url, "https://localhost/path?y=y#tab")

    def test_url_concat_multi_same_params(self):
        url = url_concat(
            "https://localhost/path",
            [('y', 'y1'), ('y', 'y2')],
        )
        self.assertEqual(url, "https://localhost/path?y=y1&y=y2")

    def test_url_concat_multi_same_query_params(self):
        url = url_concat(
            "https://localhost/path?r=1&r=2",
            [('y', 'y')],
        )
        self.assertEqual(url, "https://localhost/path?r=1&r=2&y=y")

    def test_url_concat_dict_params(self):
        url = url_concat(
            "https://localhost/path",
            dict(y='y'),
        )
        self.assertEqual(url, "https://localhost/path?y=y")


class QsParseTest(unittest.TestCase):

    def test_parsing(self):
        qsstring = "a=1&b=2&a=3"
        qs = urllib_parse.parse_qs(qsstring)
        qsl = list(qs_to_qsl(qs))
        self.assertIn(('a', '1'), qsl)
        self.assertIn(('a', '3'), qsl)
        self.assertIn(('b', '2'), qsl)


class MultipartFormDataTest(unittest.TestCase):
    def test_file_upload(self):
        data = b"""\
--1234
Content-Disposition: form-data; name="files"; filename="ab.txt"

Foo
--1234--""".replace(b"\n", b"\r\n")
        args = {}
        files = {}
        parse_multipart_form_data(b"1234", data, args, files)
        file = files["files"][0]
        self.assertEqual(file["filename"], "ab.txt")
        self.assertEqual(file["body"], b"Foo")

    def test_unquoted_names(self):
        # quotes are optional unless special characters are present
        data = b"""\
--1234
Content-Disposition: form-data; name=files; filename=ab.txt

Foo
--1234--""".replace(b"\n", b"\r\n")
        args = {}
        files = {}
        parse_multipart_form_data(b"1234", data, args, files)
        file = files["files"][0]
        self.assertEqual(file["filename"], "ab.txt")
        self.assertEqual(file["body"], b"Foo")

    def test_special_filenames(self):
        filenames = ['a;b.txt',
                     'a"b.txt',
                     'a";b.txt',
                     'a;"b.txt',
                     'a";";.txt',
                     'a\\"b.txt',
                     'a\\b.txt',
                     ]
        for filename in filenames:
            logging.debug("trying filename %r", filename)
            data = """\
--1234
Content-Disposition: form-data; name="files"; filename="%s"

Foo
--1234--""" % filename.replace('\\', '\\\\').replace('"', '\\"')
            data = utf8(data.replace("\n", "\r\n"))
            args = {}
            files = {}
            parse_multipart_form_data(b"1234", data, args, files)
            file = files["files"][0]
            self.assertEqual(file["filename"], filename)
            self.assertEqual(file["body"], b"Foo")

    def test_non_ascii_filename(self):
        data = b"""\
--1234
Content-Disposition: form-data; name="files"; filename="ab.txt"; filename*=UTF-8''%C3%A1b.txt

Foo
--1234--""".replace(b"\n", b"\r\n")
        args = {}
        files = {}
        parse_multipart_form_data(b"1234", data, args, files)
        file = files["files"][0]
        self.assertEqual(file["filename"], u"áb.txt")
        self.assertEqual(file["body"], b"Foo")

    def test_boundary_starts_and_ends_with_quotes(self):
        data = b'''\
--1234
Content-Disposition: form-data; name="files"; filename="ab.txt"

Foo
--1234--'''.replace(b"\n", b"\r\n")
        args = {}
        files = {}
        parse_multipart_form_data(b'"1234"', data, args, files)
        file = files["files"][0]
        self.assertEqual(file["filename"], "ab.txt")
        self.assertEqual(file["body"], b"Foo")

    def test_missing_headers(self):
        data = b'''\
--1234

Foo
--1234--'''.replace(b"\n", b"\r\n")
        args = {}
        files = {}
        with ExpectLog(gen_log, "multipart/form-data missing headers"):
            parse_multipart_form_data(b"1234", data, args, files)
        self.assertEqual(files, {})

    def test_invalid_content_disposition(self):
        data = b'''\
--1234
Content-Disposition: invalid; name="files"; filename="ab.txt"

Foo
--1234--'''.replace(b"\n", b"\r\n")
        args = {}
        files = {}
        with ExpectLog(gen_log, "Invalid multipart/form-data"):
            parse_multipart_form_data(b"1234", data, args, files)
        self.assertEqual(files, {})

    def test_line_does_not_end_with_correct_line_break(self):
        data = b'''\
--1234
Content-Disposition: form-data; name="files"; filename="ab.txt"

Foo--1234--'''.replace(b"\n", b"\r\n")
        args = {}
        files = {}
        with ExpectLog(gen_log, "Invalid multipart/form-data"):
            parse_multipart_form_data(b"1234", data, args, files)
        self.assertEqual(files, {})

    def test_content_disposition_header_without_name_parameter(self):
        data = b"""\
--1234
Content-Disposition: form-data; filename="ab.txt"

Foo
--1234--""".replace(b"\n", b"\r\n")
        args = {}
        files = {}
        with ExpectLog(gen_log, "multipart/form-data value missing name"):
            parse_multipart_form_data(b"1234", data, args, files)
        self.assertEqual(files, {})

    def test_data_after_final_boundary(self):
        # The spec requires that data after the final boundary be ignored.
        # http://www.w3.org/Protocols/rfc1341/7_2_Multipart.html
        # In practice, some libraries include an extra CRLF after the boundary.
        data = b"""\
--1234
Content-Disposition: form-data; name="files"; filename="ab.txt"

Foo
--1234--
""".replace(b"\n", b"\r\n")
        args = {}
        files = {}
        parse_multipart_form_data(b"1234", data, args, files)
        file = files["files"][0]
        self.assertEqual(file["filename"], "ab.txt")
        self.assertEqual(file["body"], b"Foo")


class HTTPHeadersTest(unittest.TestCase):
    def test_multi_line(self):
        # Lines beginning with whitespace are appended to the previous line
        # with any leading whitespace replaced by a single space.
        # Note that while multi-line headers are a part of the HTTP spec,
        # their use is strongly discouraged.
        data = """\
Foo: bar
 baz
Asdf: qwer
\tzxcv
Foo: even
     more
     lines
""".replace("\n", "\r\n")
        headers = HTTPHeaders.parse(data)
        self.assertEqual(headers["asdf"], "qwer zxcv")
        self.assertEqual(headers.get_list("asdf"), ["qwer zxcv"])
        self.assertEqual(headers["Foo"], "bar baz,even more lines")
        self.assertEqual(headers.get_list("foo"), ["bar baz", "even more lines"])
        self.assertEqual(sorted(list(headers.get_all())),
                         [("Asdf", "qwer zxcv"),
                          ("Foo", "bar baz"),
                          ("Foo", "even more lines")])

    def test_malformed_continuation(self):
        # If the first line starts with whitespace, it's a
        # continuation line with nothing to continue, so reject it
        # (with a proper error).
        data = " Foo: bar"
        self.assertRaises(HTTPInputError, HTTPHeaders.parse, data)

    def test_unicode_newlines(self):
        # Ensure that only \r\n is recognized as a header separator, and not
        # the other newline-like unicode characters.
        # Characters that are likely to be problematic can be found in
        # http://unicode.org/standard/reports/tr13/tr13-5.html
        # and cpython's unicodeobject.c (which defines the implementation
        # of unicode_type.splitlines(), and uses a different list than TR13).
        newlines = [
            u'\u001b',  # VERTICAL TAB
            u'\u001c',  # FILE SEPARATOR
            u'\u001d',  # GROUP SEPARATOR
            u'\u001e',  # RECORD SEPARATOR
            u'\u0085',  # NEXT LINE
            u'\u2028',  # LINE SEPARATOR
            u'\u2029',  # PARAGRAPH SEPARATOR
        ]
        for newline in newlines:
            # Try the utf8 and latin1 representations of each newline
            for encoding in ['utf8', 'latin1']:
                try:
                    try:
                        encoded = newline.encode(encoding)
                    except UnicodeEncodeError:
                        # Some chars cannot be represented in latin1
                        continue
                    data = b'Cookie: foo=' + encoded + b'bar'
                    # parse() wants a native_str, so decode through latin1
                    # in the same way the real parser does.
                    headers = HTTPHeaders.parse(
                        native_str(data.decode('latin1')))
                    expected = [('Cookie', 'foo=' +
                                 native_str(encoded.decode('latin1')) + 'bar')]
                    self.assertEqual(
                        expected, list(headers.get_all()))
                except Exception:
                    gen_log.warning("failed while trying %r in %s",
                                    newline, encoding)
                    raise

    def test_optional_cr(self):
        # Both CRLF and LF should be accepted as separators. CR should not be
        # part of the data when followed by LF, but it is a normal char
        # otherwise (or should bare CR be an error?)
        headers = HTTPHeaders.parse(
            'CRLF: crlf\r\nLF: lf\nCR: cr\rMore: more\r\n')
        self.assertEqual(sorted(headers.get_all()),
                         [('Cr', 'cr\rMore: more'),
                          ('Crlf', 'crlf'),
                          ('Lf', 'lf'),
                          ])

    def test_copy(self):
        all_pairs = [('A', '1'), ('A', '2'), ('B', 'c')]
        h1 = HTTPHeaders()
        for k, v in all_pairs:
            h1.add(k, v)
        h2 = h1.copy()
        h3 = copy.copy(h1)
        h4 = copy.deepcopy(h1)
        for headers in [h1, h2, h3, h4]:
            # All the copies are identical, no matter how they were
            # constructed.
            self.assertEqual(list(sorted(headers.get_all())), all_pairs)
        for headers in [h2, h3, h4]:
            # Neither the dict or its member lists are reused.
            self.assertIsNot(headers, h1)
            self.assertIsNot(headers.get_list('A'), h1.get_list('A'))

    def test_pickle_roundtrip(self):
        headers = HTTPHeaders()
        headers.add('Set-Cookie', 'a=b')
        headers.add('Set-Cookie', 'c=d')
        headers.add('Content-Type', 'text/html')
        pickled = pickle.dumps(headers)
        unpickled = pickle.loads(pickled)
        self.assertEqual(sorted(headers.get_all()), sorted(unpickled.get_all()))
        self.assertEqual(sorted(headers.items()), sorted(unpickled.items()))

    def test_setdefault(self):
        headers = HTTPHeaders()
        headers['foo'] = 'bar'
        # If a value is present, setdefault returns it without changes.
        self.assertEqual(headers.setdefault('foo', 'baz'), 'bar')
        self.assertEqual(headers['foo'], 'bar')
        # If a value is not present, setdefault sets it for future use.
        self.assertEqual(headers.setdefault('quux', 'xyzzy'), 'xyzzy')
        self.assertEqual(headers['quux'], 'xyzzy')
        self.assertEqual(sorted(headers.get_all()), [('Foo', 'bar'), ('Quux', 'xyzzy')])

    def test_string(self):
        headers = HTTPHeaders()
        headers.add("Foo", "1")
        headers.add("Foo", "2")
        headers.add("Foo", "3")
        headers2 = HTTPHeaders.parse(str(headers))
        self.assertEquals(headers, headers2)


class FormatTimestampTest(unittest.TestCase):
    # Make sure that all the input types are supported.
    TIMESTAMP = 1359312200.503611
    EXPECTED = 'Sun, 27 Jan 2013 18:43:20 GMT'

    def check(self, value):
        self.assertEqual(format_timestamp(value), self.EXPECTED)

    def test_unix_time_float(self):
        self.check(self.TIMESTAMP)

    def test_unix_time_int(self):
        self.check(int(self.TIMESTAMP))

    def test_struct_time(self):
        self.check(time.gmtime(self.TIMESTAMP))

    def test_time_tuple(self):
        tup = tuple(time.gmtime(self.TIMESTAMP))
        self.assertEqual(9, len(tup))
        self.check(tup)

    def test_datetime(self):
        self.check(datetime.datetime.utcfromtimestamp(self.TIMESTAMP))


# HTTPServerRequest is mainly tested incidentally to the server itself,
# but this tests the parts of the class that can be tested in isolation.
class HTTPServerRequestTest(unittest.TestCase):
    def test_default_constructor(self):
        # All parameters are formally optional, but uri is required
        # (and has been for some time).  This test ensures that no
        # more required parameters slip in.
        HTTPServerRequest(uri='/')

    def test_body_is_a_byte_string(self):
        requets = HTTPServerRequest(uri='/')
        self.assertIsInstance(requets.body, bytes)

    def test_repr_does_not_contain_headers(self):
        request = HTTPServerRequest(uri='/', headers={'Canary': 'Coal Mine'})
        self.assertTrue('Canary' not in repr(request))


class ParseRequestStartLineTest(unittest.TestCase):
    METHOD = "GET"
    PATH = "/foo"
    VERSION = "HTTP/1.1"

    def test_parse_request_start_line(self):
        start_line = " ".join([self.METHOD, self.PATH, self.VERSION])
        parsed_start_line = parse_request_start_line(start_line)
        self.assertEqual(parsed_start_line.method, self.METHOD)
        self.assertEqual(parsed_start_line.path, self.PATH)
        self.assertEqual(parsed_start_line.version, self.VERSION)


class ParseCookieTest(unittest.TestCase):
    # These tests copied from Django:
    # https://github.com/django/django/pull/6277/commits/da810901ada1cae9fc1f018f879f11a7fb467b28
    def test_python_cookies(self):
        """
        Test cases copied from Python's Lib/test/test_http_cookies.py
        """
        self.assertEqual(parse_cookie('chips=ahoy; vienna=finger'),
                         {'chips': 'ahoy', 'vienna': 'finger'})
        # Here parse_cookie() differs from Python's cookie parsing in that it
        # treats all semicolons as delimiters, even within quotes.
        self.assertEqual(
            parse_cookie('keebler="E=mc2; L=\\"Loves\\"; fudge=\\012;"'),
            {'keebler': '"E=mc2', 'L': '\\"Loves\\"', 'fudge': '\\012', '': '"'}
        )
        # Illegal cookies that have an '=' char in an unquoted value.
        self.assertEqual(parse_cookie('keebler=E=mc2'), {'keebler': 'E=mc2'})
        # Cookies with ':' character in their name.
        self.assertEqual(parse_cookie('key:term=value:term'), {'key:term': 'value:term'})
        # Cookies with '[' and ']'.
        self.assertEqual(parse_cookie('a=b; c=[; d=r; f=h'),
                         {'a': 'b', 'c': '[', 'd': 'r', 'f': 'h'})

    def test_cookie_edgecases(self):
        # Cookies that RFC6265 allows.
        self.assertEqual(parse_cookie('a=b; Domain=example.com'),
                         {'a': 'b', 'Domain': 'example.com'})
        # parse_cookie() has historically kept only the last cookie with the
        # same name.
        self.assertEqual(parse_cookie('a=b; h=i; a=c'), {'a': 'c', 'h': 'i'})

    def test_invalid_cookies(self):
        """
        Cookie strings that go against RFC6265 but browsers will send if set
        via document.cookie.
        """
        # Chunks without an equals sign appear as unnamed values per
        # https://bugzilla.mozilla.org/show_bug.cgi?id=169091
        self.assertIn('django_language',
                      parse_cookie('abc=def; unnamed; django_language=en').keys())
        # Even a double quote may be an unamed value.
        self.assertEqual(parse_cookie('a=b; "; c=d'), {'a': 'b', '': '"', 'c': 'd'})
        # Spaces in names and values, and an equals sign in values.
        self.assertEqual(parse_cookie('a b c=d e = f; gh=i'), {'a b c': 'd e = f', 'gh': 'i'})
        # More characters the spec forbids.
        self.assertEqual(parse_cookie('a   b,c<>@:/[]?{}=d  "  =e,f g'),
                         {'a   b,c<>@:/[]?{}': 'd  "  =e,f g'})
        # Unicode characters. The spec only allows ASCII.
        self.assertEqual(parse_cookie('saint=André Bessette'),
                         {'saint': native_str('André Bessette')})
        # Browsers don't send extra whitespace or semicolons in Cookie headers,
        # but parse_cookie() should parse whitespace the same way
        # document.cookie parses whitespace.
        self.assertEqual(parse_cookie('  =  b  ;  ;  =  ;   c  =  ;  '), {'': 'b', 'c': ''})
