#!/usr/bin/env python

# test_quote.py - unit test for strings quoting
#
# Copyright (C) 2007-2019 Daniele Varrazzo  <daniele.varrazzo@gmail.com>
# Copyright (C) 2020-2021 The Psycopg Team
#
# psycopg2 is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# In addition, as a special exception, the copyright holders give
# permission to link this program with the OpenSSL library (or with
# modified versions of OpenSSL that use the same license as OpenSSL),
# and distribute linked combinations including the two.
#
# You must obey the GNU Lesser General Public License in all respects for
# all of the code used other than OpenSSL.
#
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
# License for more details.

from . import testutils
import unittest
from .testutils import ConnectingTestCase, skip_if_crdb

import psycopg2
import psycopg2.extensions
from psycopg2.extensions import adapt, quote_ident


class QuotingTestCase(ConnectingTestCase):
    r"""Checks the correct quoting of strings and binary objects.

    Since ver. 8.1, PostgreSQL is moving towards SQL standard conforming
    strings, where the backslash (\) is treated as literal character,
    not as escape. To treat the backslash as a C-style escapes, PG supports
    the E'' quotes.

    This test case checks that the E'' quotes are used whenever they are
    needed. The tests are expected to pass with all PostgreSQL server versions
    (currently tested with 7.4 <= PG <= 8.3beta) and with any
    'standard_conforming_strings' server parameter value.
    The tests also check that no warning is raised ('escape_string_warning'
    should be on).

    https://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#SQL-SYNTAX-STRINGS
    https://www.postgresql.org/docs/current/static/runtime-config-compatible.html
    """
    def test_string(self):
        data = """some data with \t chars
        to escape into, 'quotes' and \\ a backslash too.
        """
        data += "".join(map(chr, range(1, 127)))

        curs = self.conn.cursor()
        curs.execute("SELECT %s;", (data,))
        res = curs.fetchone()[0]

        self.assertEqual(res, data)

    def test_string_null_terminator(self):
        curs = self.conn.cursor()
        data = 'abcd\x01\x00cdefg'

        try:
            curs.execute("SELECT %s", (data,))
        except ValueError as e:
            self.assertEquals(str(e),
                'A string literal cannot contain NUL (0x00) characters.')
        else:
            self.fail("ValueError not raised")

    def test_binary(self):
        data = b"""some data with \000\013 binary
        stuff into, 'quotes' and \\ a backslash too.
        """
        data += bytes(list(range(256)))

        curs = self.conn.cursor()
        curs.execute("SELECT %s::bytea;", (psycopg2.Binary(data),))
        res = curs.fetchone()[0].tobytes()

        if res[0] in (b'x', ord(b'x')) and self.conn.info.server_version >= 90000:
            return self.skipTest(
                "bytea broken with server >= 9.0, libpq < 9")

        self.assertEqual(res, data)

    def test_unicode(self):
        curs = self.conn.cursor()
        curs.execute("SHOW server_encoding")
        server_encoding = curs.fetchone()[0]
        if server_encoding != "UTF8":
            return self.skipTest(
                f"Unicode test skipped since server encoding is {server_encoding}")

        data = """some data with \t chars
        to escape into, 'quotes', \u20ac euro sign and \\ a backslash too.
        """
        data += "".join(map(chr, [u for u in range(1, 65536)
            if not 0xD800 <= u <= 0xDFFF]))    # surrogate area
        self.conn.set_client_encoding('UNICODE')

        psycopg2.extensions.register_type(psycopg2.extensions.UNICODE, self.conn)
        curs.execute("SELECT %s::text;", (data,))
        res = curs.fetchone()[0]

        self.assertEqual(res, data)

    @skip_if_crdb("encoding")
    def test_latin1(self):
        self.conn.set_client_encoding('LATIN1')
        curs = self.conn.cursor()
        data = bytes(list(range(32, 127))
            + list(range(160, 256))).decode('latin1')

        # as string
        curs.execute("SELECT %s::text;", (data,))
        res = curs.fetchone()[0]
        self.assertEqual(res, data)


    @skip_if_crdb("encoding")
    def test_koi8(self):
        self.conn.set_client_encoding('KOI8')
        curs = self.conn.cursor()
        data = bytes(list(range(32, 127))
            + list(range(128, 256))).decode('koi8_r')

        # as string
        curs.execute("SELECT %s::text;", (data,))
        res = curs.fetchone()[0]
        self.assertEqual(res, data)

    def test_bytes(self):
        snowman = "\u2603"
        conn = self.connect()
        conn.set_client_encoding('UNICODE')
        psycopg2.extensions.register_type(psycopg2.extensions.BYTES, conn)
        curs = conn.cursor()
        curs.execute("select %s::text", (snowman,))
        x = curs.fetchone()[0]
        self.assert_(isinstance(x, bytes))
        self.assertEqual(x, snowman.encode('utf8'))


class TestQuotedString(ConnectingTestCase):
    def test_encoding_from_conn(self):
        q = psycopg2.extensions.QuotedString('hi')
        self.assertEqual(q.encoding, 'latin1')

        self.conn.set_client_encoding('utf_8')
        q.prepare(self.conn)
        self.assertEqual(q.encoding, 'utf_8')


class TestQuotedIdentifier(ConnectingTestCase):
    def test_identifier(self):
        self.assertEqual(quote_ident('blah-blah', self.conn), '"blah-blah"')
        self.assertEqual(quote_ident('quote"inside', self.conn), '"quote""inside"')

    @testutils.skip_before_postgres(8, 0)
    def test_unicode_ident(self):
        snowman = "0x07"
        quoted = '"' + snowman + '"'
        self.assertEqual(quote_ident(snowman, self.conn), quoted)


class TestStringAdapter(ConnectingTestCase):
    def test_encoding_default(self):
        a = adapt("hello")
        self.assertEqual(a.encoding, 'latin1')
        self.assertEqual(a.getquoted(), b"'hello'")

        # NOTE: we can't really test an encoding different from utf8, because
        # when encoding without connection the libpq will use parameters from
        # a previous one, so what would happens depends jn the tests run order.
        # egrave = u'\xe8'
        # self.assertEqual(adapt(egrave).getquoted(), "'\xe8'")

    def test_encoding_error(self):
        snowman = "\u2603"
        a = adapt(snowman)
        self.assertRaises(UnicodeEncodeError, a.getquoted)

    def test_set_encoding(self):
        # Note: this works-ish mostly in case when the standard db connection
        # we test with is utf8, otherwise the encoding chosen by PQescapeString
        # may give bad results.
        snowman = "\u2603"
        a = adapt(snowman)
        a.encoding = 'utf8'
        self.assertEqual(a.encoding, 'utf8')
        self.assertEqual(a.getquoted(), b"'\xe2\x98\x83'")

    def test_connection_wins_anyway(self):
        snowman = "\u2603"
        a = adapt(snowman)
        a.encoding = 'latin9'

        self.conn.set_client_encoding('utf8')
        a.prepare(self.conn)

        self.assertEqual(a.encoding, 'utf_8')
        self.assertQuotedEqual(a.getquoted(), b"'\xe2\x98\x83'")

    def test_adapt_bytes(self):
        snowman = "\u2603"
        self.conn.set_client_encoding('utf8')
        a = psycopg2.extensions.QuotedString(snowman.encode('utf8'))
        a.prepare(self.conn)
        self.assertQuotedEqual(a.getquoted(), b"'\xe2\x98\x83'")


def test_suite():
    return unittest.TestLoader().loadTestsFromName(__name__)


if __name__ == "__main__":
    unittest.main()