# coding: utf-8

import gzip
import io
from unittest import mock
from http.client import IncompleteRead
from urllib.parse import quote as url_quote

import cherrypy
from cherrypy._cpcompat import ntob, ntou

from cherrypy.test import helper


europoundUnicode = ntou('£', encoding='utf-8')
sing = ntou('毛泽东: Sing, Little Birdie?', encoding='utf-8')

sing8 = sing.encode('utf-8')
sing16 = sing.encode('utf-16')


class EncodingTests(helper.CPWebCase):

    @staticmethod
    def setup_server():
        class Root:

            @cherrypy.expose
            def index(self, param):
                assert param == europoundUnicode, '%r != %r' % (
                    param, europoundUnicode)
                yield europoundUnicode

            @cherrypy.expose
            def mao_zedong(self):
                return sing

            @cherrypy.expose
            @cherrypy.config(**{'tools.encode.encoding': 'utf-8'})
            def utf8(self):
                return sing8

            @cherrypy.expose
            def cookies_and_headers(self):
                # if the headers have non-ascii characters and a cookie has
                #  any part which is unicode (even ascii), the response
                #  should not fail.
                cherrypy.response.cookie['candy'] = 'bar'
                cherrypy.response.cookie['candy']['domain'] = 'cherrypy.dev'
                cherrypy.response.headers[
                    'Some-Header'] = 'My d\xc3\xb6g has fleas'
                cherrypy.response.headers[
                    'Bytes-Header'] = b'Bytes given header'
                return 'Any content'

            @cherrypy.expose
            def reqparams(self, *args, **kwargs):
                return b', '.join(
                    [': '.join((k, v)).encode('utf8')
                     for k, v in sorted(cherrypy.request.params.items())]
                )

            @cherrypy.expose
            @cherrypy.config(**{
                'tools.encode.text_only': False,
                'tools.encode.add_charset': True,
            })
            def nontext(self, *args, **kwargs):
                cherrypy.response.headers[
                    'Content-Type'] = 'application/binary'
                return '\x00\x01\x02\x03'

        class GZIP:

            @cherrypy.expose
            def index(self):
                yield 'Hello, world'

            @cherrypy.expose
            # Turn encoding off so the gzip tool is the one doing the collapse.
            @cherrypy.config(**{'tools.encode.on': False})
            def noshow(self):
                # Test for ticket #147, where yield showed no exceptions
                # (content-encoding was still gzip even though traceback
                # wasn't zipped).
                raise IndexError()
                yield 'Here be dragons'

            @cherrypy.expose
            @cherrypy.config(**{'response.stream': True})
            def noshow_stream(self):
                # Test for ticket #147, where yield showed no exceptions
                # (content-encoding was still gzip even though traceback
                # wasn't zipped).
                raise IndexError()
                yield 'Here be dragons'

        class Decode:

            @cherrypy.expose
            @cherrypy.config(**{
                'tools.decode.on': True,
                'tools.decode.default_encoding': ['utf-16'],
            })
            def extra_charset(self, *args, **kwargs):
                return ', '.join([': '.join((k, v))
                                  for k, v in cherrypy.request.params.items()])

            @cherrypy.expose
            @cherrypy.config(**{
                'tools.decode.on': True,
                'tools.decode.encoding': 'utf-16',
            })
            def force_charset(self, *args, **kwargs):
                return ', '.join([': '.join((k, v))
                                  for k, v in cherrypy.request.params.items()])

        root = Root()
        root.gzip = GZIP()
        root.decode = Decode()
        cherrypy.tree.mount(root, config={'/gzip': {'tools.gzip.on': True}})

    def test_query_string_decoding(self):
        URI_TMPL = '/reqparams?q={q}'

        europoundUtf8_2_bytes = europoundUnicode.encode('utf-8')
        europoundUtf8_2nd_byte = europoundUtf8_2_bytes[1:2]

        # Encoded utf8 query strings MUST be parsed correctly.
        # Here, q is the POUND SIGN U+00A3 encoded in utf8 and then %HEX
        self.getPage(URI_TMPL.format(q=url_quote(europoundUtf8_2_bytes)))
        # The return value will be encoded as utf8.
        self.assertBody(b'q: ' + europoundUtf8_2_bytes)

        # Query strings that are incorrectly encoded MUST raise 404.
        # Here, q is the second byte of POUND SIGN U+A3 encoded in utf8
        # and then %HEX
        # TODO: check whether this shouldn't raise 400 Bad Request instead
        self.getPage(URI_TMPL.format(q=url_quote(europoundUtf8_2nd_byte)))
        self.assertStatus(404)
        self.assertErrorPage(
            404,
            'The given query string could not be processed. Query '
            "strings for this resource must be encoded with 'utf8'.")

    def test_urlencoded_decoding(self):
        # Test the decoding of an application/x-www-form-urlencoded entity.
        europoundUtf8 = europoundUnicode.encode('utf-8')
        body = b'param=' + europoundUtf8
        self.getPage('/',
                     method='POST',
                     headers=[
                         ('Content-Type', 'application/x-www-form-urlencoded'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertBody(europoundUtf8)

        # Encoded utf8 entities MUST be parsed and decoded correctly.
        # Here, q is the POUND SIGN U+00A3 encoded in utf8
        body = b'q=\xc2\xa3'
        self.getPage('/reqparams', method='POST',
                     headers=[(
                         'Content-Type', 'application/x-www-form-urlencoded'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertBody(b'q: \xc2\xa3')

        # ...and in utf16, which is not in the default attempt_charsets list:
        body = b'\xff\xfeq\x00=\xff\xfe\xa3\x00'
        self.getPage('/reqparams',
                     method='POST',
                     headers=[
                         ('Content-Type',
                          'application/x-www-form-urlencoded;charset=utf-16'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertBody(b'q: \xc2\xa3')

        # Entities that are incorrectly encoded MUST raise 400.
        # Here, q is the POUND SIGN U+00A3 encoded in utf16, but
        # the Content-Type incorrectly labels it utf-8.
        body = b'\xff\xfeq\x00=\xff\xfe\xa3\x00'
        self.getPage('/reqparams',
                     method='POST',
                     headers=[
                         ('Content-Type',
                          'application/x-www-form-urlencoded;charset=utf-8'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertStatus(400)
        self.assertErrorPage(
            400,
            'The request entity could not be decoded. The following charsets '
            "were attempted: ['utf-8']")

    def test_decode_tool(self):
        # An extra charset should be tried first, and succeed if it matches.
        # Here, we add utf-16 as a charset and pass a utf-16 body.
        body = b'\xff\xfeq\x00=\xff\xfe\xa3\x00'
        self.getPage('/decode/extra_charset', method='POST',
                     headers=[(
                         'Content-Type', 'application/x-www-form-urlencoded'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertBody(b'q: \xc2\xa3')

        # An extra charset should be tried first, and continue to other default
        # charsets if it doesn't match.
        # Here, we add utf-16 as a charset but still pass a utf-8 body.
        body = b'q=\xc2\xa3'
        self.getPage('/decode/extra_charset', method='POST',
                     headers=[(
                         'Content-Type', 'application/x-www-form-urlencoded'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertBody(b'q: \xc2\xa3')

        # An extra charset should error if force is True and it doesn't match.
        # Here, we force utf-16 as a charset but still pass a utf-8 body.
        body = b'q=\xc2\xa3'
        self.getPage('/decode/force_charset', method='POST',
                     headers=[(
                         'Content-Type', 'application/x-www-form-urlencoded'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertErrorPage(
            400,
            'The request entity could not be decoded. The following charsets '
            "were attempted: ['utf-16']")

    def test_multipart_decoding(self):
        # Test the decoding of a multipart entity when the charset (utf16) is
        # explicitly given.
        body = ntob('\r\n'.join([
            '--X',
            'Content-Type: text/plain;charset=utf-16',
            'Content-Disposition: form-data; name="text"',
            '',
            '\xff\xfea\x00b\x00\x1c c\x00',
            '--X',
            'Content-Type: text/plain;charset=utf-16',
            'Content-Disposition: form-data; name="submit"',
            '',
            '\xff\xfeC\x00r\x00e\x00a\x00t\x00e\x00',
            '--X--'
        ]))
        self.getPage('/reqparams', method='POST',
                     headers=[(
                         'Content-Type', 'multipart/form-data;boundary=X'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertBody(b'submit: Create, text: ab\xe2\x80\x9cc')

    @mock.patch('cherrypy._cpreqbody.Part.maxrambytes', 1)
    def test_multipart_decoding_bigger_maxrambytes(self):
        """
        Decoding of a multipart entity should also pass when
        the entity is bigger than maxrambytes. See ticket #1352.
        """
        self.test_multipart_decoding()

    def test_multipart_decoding_no_charset(self):
        # Test the decoding of a multipart entity when the charset (utf8) is
        # NOT explicitly given, but is in the list of charsets to attempt.
        body = ntob('\r\n'.join([
            '--X',
            'Content-Disposition: form-data; name="text"',
            '',
            '\xe2\x80\x9c',
            '--X',
            'Content-Disposition: form-data; name="submit"',
            '',
            'Create',
            '--X--'
        ]))
        self.getPage('/reqparams', method='POST',
                     headers=[(
                         'Content-Type', 'multipart/form-data;boundary=X'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertBody(b'submit: Create, text: \xe2\x80\x9c')

    def test_multipart_decoding_no_successful_charset(self):
        # Test the decoding of a multipart entity when the charset (utf16) is
        # NOT explicitly given, and is NOT in the list of charsets to attempt.
        body = ntob('\r\n'.join([
            '--X',
            'Content-Disposition: form-data; name="text"',
            '',
            '\xff\xfea\x00b\x00\x1c c\x00',
            '--X',
            'Content-Disposition: form-data; name="submit"',
            '',
            '\xff\xfeC\x00r\x00e\x00a\x00t\x00e\x00',
            '--X--'
        ]))
        self.getPage('/reqparams', method='POST',
                     headers=[(
                         'Content-Type', 'multipart/form-data;boundary=X'),
                         ('Content-Length', str(len(body))),
                     ],
                     body=body),
        self.assertStatus(400)
        self.assertErrorPage(
            400,
            'The request entity could not be decoded. The following charsets '
            "were attempted: ['us-ascii', 'utf-8']")

    def test_nontext(self):
        self.getPage('/nontext')
        self.assertHeader('Content-Type', 'application/binary;charset=utf-8')
        self.assertBody('\x00\x01\x02\x03')

    def testEncoding(self):
        # Default encoding should be utf-8
        self.getPage('/mao_zedong')
        self.assertBody(sing8)

        # Ask for utf-16.
        self.getPage('/mao_zedong', [('Accept-Charset', 'utf-16')])
        self.assertHeader('Content-Type', 'text/html;charset=utf-16')
        self.assertBody(sing16)

        # Ask for multiple encodings. ISO-8859-1 should fail, and utf-16
        # should be produced.
        self.getPage('/mao_zedong', [('Accept-Charset',
                                      'iso-8859-1;q=1, utf-16;q=0.5')])
        self.assertBody(sing16)

        # The "*" value should default to our default_encoding, utf-8
        self.getPage('/mao_zedong', [('Accept-Charset', '*;q=1, utf-7;q=.2')])
        self.assertBody(sing8)

        # Only allow iso-8859-1, which should fail and raise 406.
        self.getPage('/mao_zedong', [('Accept-Charset', 'iso-8859-1, *;q=0')])
        self.assertStatus('406 Not Acceptable')
        self.assertInBody('Your client sent this Accept-Charset header: '
                          'iso-8859-1, *;q=0. We tried these charsets: '
                          'iso-8859-1.')

        # Ask for x-mac-ce, which should be unknown. See ticket #569.
        self.getPage('/mao_zedong', [('Accept-Charset',
                                      'us-ascii, ISO-8859-1, x-mac-ce')])
        self.assertStatus('406 Not Acceptable')
        self.assertInBody('Your client sent this Accept-Charset header: '
                          'us-ascii, ISO-8859-1, x-mac-ce. We tried these '
                          'charsets: ISO-8859-1, us-ascii, x-mac-ce.')

        # Test the 'encoding' arg to encode.
        self.getPage('/utf8')
        self.assertBody(sing8)
        self.getPage('/utf8', [('Accept-Charset', 'us-ascii, ISO-8859-1')])
        self.assertStatus('406 Not Acceptable')

        # Test malformed quality value, which should raise 400.
        self.getPage('/mao_zedong', [('Accept-Charset',
                                      'ISO-8859-1,utf-8;q=0.7,*;q=0.7)')])
        self.assertStatus('400 Bad Request')

    def testGzip(self):
        zbuf = io.BytesIO()
        zfile = gzip.GzipFile(mode='wb', fileobj=zbuf, compresslevel=9)
        zfile.write(b'Hello, world')
        zfile.close()

        self.getPage('/gzip/', headers=[('Accept-Encoding', 'gzip')])
        self.assertInBody(zbuf.getvalue()[:3])
        self.assertHeader('Vary', 'Accept-Encoding')
        self.assertHeader('Content-Encoding', 'gzip')

        # Test when gzip is denied.
        self.getPage('/gzip/', headers=[('Accept-Encoding', 'identity')])
        self.assertHeader('Vary', 'Accept-Encoding')
        self.assertNoHeader('Content-Encoding')
        self.assertBody('Hello, world')

        self.getPage('/gzip/', headers=[('Accept-Encoding', 'gzip;q=0')])
        self.assertHeader('Vary', 'Accept-Encoding')
        self.assertNoHeader('Content-Encoding')
        self.assertBody('Hello, world')

        # Test that trailing comma doesn't cause IndexError
        # Ref: https://github.com/cherrypy/cherrypy/issues/988
        self.getPage('/gzip/', headers=[('Accept-Encoding', 'gzip,deflate,')])
        self.assertStatus(200)
        self.assertNotInBody('IndexError')

        self.getPage('/gzip/', headers=[('Accept-Encoding', '*;q=0')])
        self.assertStatus(406)
        self.assertNoHeader('Content-Encoding')
        self.assertErrorPage(406, 'identity, gzip')

        # Test for ticket #147
        self.getPage('/gzip/noshow', headers=[('Accept-Encoding', 'gzip')])
        self.assertNoHeader('Content-Encoding')
        self.assertStatus(500)
        self.assertErrorPage(500, pattern='IndexError\n')

        # In this case, there's nothing we can do to deliver a
        # readable page, since 1) the gzip header is already set,
        # and 2) we may have already written some of the body.
        # The fix is to never stream yields when using gzip.
        if (cherrypy.server.protocol_version == 'HTTP/1.0' or
                getattr(cherrypy.server, 'using_apache', False)):
            self.getPage('/gzip/noshow_stream',
                         headers=[('Accept-Encoding', 'gzip')])
            self.assertHeader('Content-Encoding', 'gzip')
            self.assertInBody('\x1f\x8b\x08\x00')
        else:
            # The wsgiserver will simply stop sending data, and the HTTP client
            # will error due to an incomplete chunk-encoded stream.
            self.assertRaises((ValueError, IncompleteRead), self.getPage,
                              '/gzip/noshow_stream',
                              headers=[('Accept-Encoding', 'gzip')])

    def test_UnicodeHeaders(self):
        self.getPage('/cookies_and_headers')
        self.assertBody('Any content')

    def test_BytesHeaders(self):
        self.getPage('/cookies_and_headers')
        self.assertBody('Any content')
        self.assertHeader('Bytes-Header', 'Bytes given header')
