sqlmap/lib/core/convert.py

#!/usr/bin/env python

"""
Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
See the file 'LICENSE' for copying permission
"""

try:
    import cPickle as pickle
except:
    import pickle

import base64
import binascii
import codecs
import collections
import json
import re
import sys

from lib.core.data import conf
from lib.core.data import kb
from lib.core.settings import INVALID_UNICODE_PRIVATE_AREA
from lib.core.settings import IS_TTY
from lib.core.settings import IS_WIN
from lib.core.settings import NULL
from lib.core.settings import PICKLE_PROTOCOL
from lib.core.settings import SAFE_HEX_MARKER
from lib.core.settings import UNICODE_ENCODING
from thirdparty import six
from thirdparty.six import unichr as _unichr

def base64pickle(value):
    """
    Serializes (with pickle) and encodes to Base64 format supplied (binary) value

    >>> base64unpickle(base64pickle([1, 2, 3])) == [1, 2, 3]
    True
    """

    retVal = None

    try:
        retVal = encodeBase64(pickle.dumps(value, PICKLE_PROTOCOL))
    except:
        warnMsg = "problem occurred while serializing "
        warnMsg += "instance of a type '%s'" % type(value)
        singleTimeWarnMessage(warnMsg)

        try:
            retVal = encodeBase64(pickle.dumps(value))
        except:
            retVal = encodeBase64(pickle.dumps(str(value), PICKLE_PROTOCOL))

    return retVal

def base64unpickle(value):
    """
    Decodes value from Base64 to plain format and deserializes (with pickle) its content

    >>> type(base64unpickle('gAJjX19idWlsdGluX18Kb2JqZWN0CnEBKYFxAi4=')) == object
    True
    """

    retVal = None

    try:
        retVal = pickle.loads(decodeBase64(value))
    except TypeError:
        retVal = pickle.loads(decodeBase64(bytes(value)))

    return retVal

def htmlUnescape(value):
    """
    Returns (basic conversion) HTML unescaped value

    >>> htmlUnescape('a&lt;b') == 'a<b'
    True
    """

    retVal = value

    if value and isinstance(value, six.string_types):
        replacements = (("&lt;", '<'), ("&gt;", '>'), ("&quot;", '"'), ("&nbsp;", ' '), ("&amp;", '&'), ("&apos;", "'"))
        for code, value in replacements:
            retVal = retVal.replace(code, value)

        try:
            retVal = re.sub(r"&#x([^ ;]+);", lambda match: _unichr(int(match.group(1), 16)), retVal)
        except ValueError:
            pass

    return retVal

def singleTimeWarnMessage(message):  # Cross-referenced function
    sys.stdout.write(message)
    sys.stdout.write("\n")
    sys.stdout.flush()

def filterNone(values):  # Cross-referenced function
    return [_ for _ in values if _] if isinstance(values, collections.Iterable) else values

def isListLike(value):  # Cross-referenced function
    raise NotImplementedError

def shellExec(cmd):  # Cross-referenced function
    raise NotImplementedError

def jsonize(data):
    """
    Returns JSON serialized data

    >>> jsonize({'foo':'bar'})
    '{\\n    "foo": "bar"\\n}'
    """

    return json.dumps(data, sort_keys=False, indent=4)

def dejsonize(data):
    """
    Returns JSON deserialized data

    >>> dejsonize('{\\n    "foo": "bar"\\n}') == {u'foo': u'bar'}
    True
    """

    return json.loads(data)

def decodeHex(value, binary=True):
    """
    Returns a decoded representation of provided hexadecimal value

    >>> decodeHex("313233") == b"123"
    True
    >>> decodeHex("313233", binary=False) == u"123"
    True
    """

    retVal = value

    if isinstance(value, six.binary_type):
        value = getText(value)

    if value.lower().startswith("0x"):
        value = value[2:]

    try:
        retVal = codecs.decode(value, "hex")
    except LookupError:
        retVal = binascii.unhexlify(value)

    if not binary:
        retVal = getText(retVal)

    return retVal

def encodeHex(value, binary=True):
    """
    Returns a encoded representation of provided string value

    >>> encodeHex(b"123") == b"313233"
    True
    >>> encodeHex("123", binary=False)
    '313233'
    """

    if isinstance(value, six.text_type):
        value = value.encode(UNICODE_ENCODING)

    try:
        retVal = codecs.encode(value, "hex")
    except LookupError:
        retVal = binascii.hexlify(value)

    if not binary:
        retVal = getText(retVal)

    return retVal

def decodeBase64(value, binary=True):
    """
    Returns a decoded representation of provided Base64 value

    >>> decodeBase64("MTIz") == b"123"
    True
    >>> decodeBase64("MTIz", binary=False)
    '123'
    """

    retVal = base64.b64decode(value)

    if not binary:
        retVal = getText(retVal)

    return retVal

def encodeBase64(value, binary=True):
    """
    Returns a decoded representation of provided Base64 value

    >>> encodeBase64(b"123") == b"MTIz"
    True
    >>> encodeBase64(u"123", binary=False)
    'MTIz'
    """

    if isinstance(value, six.text_type):
        value = value.encode(UNICODE_ENCODING)

    retVal = base64.b64encode(value)

    if not binary:
        retVal = getText(retVal)

    return retVal

def getBytes(value, encoding=UNICODE_ENCODING, errors="strict", unsafe=True):
    """
    Returns byte representation of provided Unicode value

    >>> getBytes(u"foo\\\\x01\\\\x83\\\\xffbar") == b"foo\\x01\\x83\\xffbar"
    True
    """

    retVal = value

    if isinstance(value, six.text_type):
        if INVALID_UNICODE_PRIVATE_AREA:
            if unsafe:
                for char in xrange(0xF0000, 0xF00FF + 1):
                    value = value.replace(_unichr(char), "%s%02x" % (SAFE_HEX_MARKER, char - 0xF0000))

            retVal = value.encode(encoding, errors)

            if unsafe:
                retVal = re.sub(r"%s([0-9a-f]{2})" % SAFE_HEX_MARKER, lambda _: decodeHex(_.group(1)), retVal)
        else:
            retVal = value.encode(encoding, errors)

            if unsafe:
                retVal = re.sub(b"\\\\x([0-9a-f]{2})", lambda _: decodeHex(_.group(1)), retVal)

    return retVal

def getOrds(value):
    """
    Returns ORD(...) representation of provided string value

    >>> getOrds(u'fo\\xf6bar')
    [102, 111, 246, 98, 97, 114]
    >>> getOrds(b"fo\\xc3\\xb6bar")
    [102, 111, 195, 182, 98, 97, 114]
    """

    return [_ if isinstance(_, int) else ord(_) for _ in value]

def getUnicode(value, encoding=None, noneToNull=False):
    """
    Return the unicode representation of the supplied value:

    >>> getUnicode('test') == u'test'
    True
    >>> getUnicode(1) == u'1'
    True
    """

    if noneToNull and value is None:
        return NULL

    if isinstance(value, six.text_type):
        return value
    elif isinstance(value, six.binary_type):
        # Heuristics (if encoding not explicitly specified)
        candidates = filterNone((encoding, kb.get("pageEncoding") if kb.get("originalPage") else None, conf.get("encoding"), UNICODE_ENCODING, sys.getfilesystemencoding()))
        if all(_ in value for _ in (b'<', b'>')):
            pass
        elif any(_ in value for _ in (b":\\", b'/', b'.')) and b'\n' not in value:
            candidates = filterNone((encoding, sys.getfilesystemencoding(), kb.get("pageEncoding") if kb.get("originalPage") else None, UNICODE_ENCODING, conf.get("encoding")))
        elif conf.get("encoding") and b'\n' not in value:
            candidates = filterNone((encoding, conf.get("encoding"), kb.get("pageEncoding") if kb.get("originalPage") else None, sys.getfilesystemencoding(), UNICODE_ENCODING))

        for candidate in candidates:
            try:
                return six.text_type(value, candidate)
            except UnicodeDecodeError:
                pass

        try:
            return six.text_type(value, encoding or (kb.get("pageEncoding") if kb.get("originalPage") else None) or UNICODE_ENCODING)
        except UnicodeDecodeError:
            return six.text_type(value, UNICODE_ENCODING, errors="reversible")
    elif isListLike(value):
        value = list(getUnicode(_, encoding, noneToNull) for _ in value)
        return value
    else:
        try:
            return six.text_type(value)
        except UnicodeDecodeError:
            return six.text_type(str(value), errors="ignore")  # encoding ignored for non-basestring instances

def getText(value):
    """
    Returns textual value of a given value (Note: not necessary Unicode on Python2)

    >>> getText(b"foobar")
    'foobar'
    >>> isinstance(getText(u"fo\\u2299bar"), six.text_type)
    True
    """

    retVal = value

    if isinstance(value, six.binary_type):
        retVal = getUnicode(value)

    if six.PY2:
        try:
            retVal = str(retVal)
        except:
            pass

    return retVal

def stdoutEncode(value):
    """
    Returns binary representation of a given Unicode value safe for writing to stdout
    """

    value = value or ""

    if IS_WIN and IS_TTY and kb.get("codePage", -1) is None:
        output = shellExec("chcp")
        match = re.search(r": (\d{3,})", output or "")

        if match:
            try:
                candidate = "cp%s" % match.group(1)
                codecs.lookup(candidate)
            except LookupError:
                pass
            else:
                kb.codePage = candidate

        kb.codePage = kb.codePage or ""

    if isinstance(value, six.text_type):
        encoding = kb.get("codePage") or sys.stdout.encoding or UNICODE_ENCODING

        while True:
            try:
                retVal = value.encode(encoding)
                break
            except UnicodeEncodeError as ex:
                value = value[:ex.start] + "?" * (ex.end - ex.start) + value[ex.end:]

                warnMsg = "cannot properly display (some) Unicode characters "
                warnMsg += "inside your terminal ('%s') environment. All " % encoding
                warnMsg += "unhandled occurrences will result in "
                warnMsg += "replacement with '?' character. Please, find "
                warnMsg += "proper character representation inside "
                warnMsg += "corresponding output files"
                singleTimeWarnMessage(warnMsg)

        if six.PY3:
            retVal = getUnicode(retVal, encoding)

    else:
        retVal = value

    return retVal