escape.py

#!/usr/bin/env python
#
# Copyright 2009 Facebook
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

"""Escaping/unescaping methods for HTML, JSON, URLs, and others.

Also includes a few other miscellaneous string manipulation functions that
have crept in over time.
"""

from __future__ import absolute_import, division, print_function, with_statement

import re
import sys

from tornado.util import unicode_type, basestring_type, u

try:
    from urllib.parse import parse_qs as _parse_qs  # py3
except ImportError:
    from urlparse import parse_qs as _parse_qs  # Python 2.6+

try:
    import htmlentitydefs  # py2
except ImportError:
    import html.entities as htmlentitydefs  # py3

try:
    import urllib.parse as urllib_parse  # py3
except ImportError:
    import urllib as urllib_parse  # py2

import json

try:
    unichr
except NameError:
    unichr = chr

_XHTML_ESCAPE_RE = re.compile('[&<>"\']')
_XHTML_ESCAPE_DICT = {'&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;',
                      '\'': '&#39;'}


def xhtml_escape(value):
    """Escapes a string so it is valid within HTML or XML.

    Escapes the characters ``<``, ``>``, ``"``, ``'``, and ``&``.
    When used in attribute values the escaped strings must be enclosed
    in quotes.

    .. versionchanged:: 3.2

       Added the single quote to the list of escaped characters.
    """
    return _XHTML_ESCAPE_RE.sub(lambda match: _XHTML_ESCAPE_DICT[match.group(0)],
                                to_basestring(value))


def xhtml_unescape(value):
    """Un-escapes an XML-escaped string."""
    return re.sub(r"&(#?)(\w+?);", _convert_entity, _unicode(value))


# The fact that json_encode wraps json.dumps is an implementation detail.
# Please see https://github.com/tornadoweb/tornado/pull/706
# before sending a pull request that adds **kwargs to this function.
def json_encode(value):
    """JSON-encodes the given Python object."""
    # JSON permits but does not require forward slashes to be escaped.
    # This is useful when json data is emitted in a <script> tag
    # in HTML, as it prevents </script> tags from prematurely terminating
    # the javascript.  Some json libraries do this escaping by default,
    # although python's standard library does not, so we do it here.
    # http://stackoverflow.com/questions/1580647/json-why-are-forward-slashes-escaped
    return json.dumps(value).replace("</", "<\\/")


def json_decode(value):
    """Returns Python objects for the given JSON string."""
    return json.loads(to_basestring(value))


def squeeze(value):
    """Replace all sequences of whitespace chars with a single space."""
    return re.sub(r"[\x00-\x20]+", " ", value).strip()


def url_escape(value, plus=True):
    """Returns a URL-encoded version of the given value.

    If ``plus`` is true (the default), spaces will be represented
    as "+" instead of "%20".  This is appropriate for query strings
    but not for the path component of a URL.  Note that this default
    is the reverse of Python's urllib module.

    .. versionadded:: 3.1
        The ``plus`` argument
    """
    quote = urllib_parse.quote_plus if plus else urllib_parse.quote
    return quote(utf8(value))


# python 3 changed things around enough that we need two separate
# implementations of url_unescape.  We also need our own implementation
# of parse_qs since python 3's version insists on decoding everything.
if sys.version_info[0] < 3:
    def url_unescape(value, encoding='utf-8', plus=True):
        """Decodes the given value from a URL.

        The argument may be either a byte or unicode string.

        If encoding is None, the result will be a byte string.  Otherwise,
        the result is a unicode string in the specified encoding.

        If ``plus`` is true (the default), plus signs will be interpreted
        as spaces (literal plus signs must be represented as "%2B").  This
        is appropriate for query strings and form-encoded values but not
        for the path component of a URL.  Note that this default is the
        reverse of Python's urllib module.

        .. versionadded:: 3.1
           The ``plus`` argument
        """
        unquote = (urllib_parse.unquote_plus if plus else urllib_parse.unquote)
        if encoding is None:
            return unquote(utf8(value))
        else:
            return unicode_type(unquote(utf8(value)), encoding)

    parse_qs_bytes = _parse_qs
else:
    def url_unescape(value, encoding='utf-8', plus=True):
        """Decodes the given value from a URL.

        The argument may be either a byte or unicode string.

        If encoding is None, the result will be a byte string.  Otherwise,
        the result is a unicode string in the specified encoding.

        If ``plus`` is true (the default), plus signs will be interpreted
        as spaces (literal plus signs must be represented as "%2B").  This
        is appropriate for query strings and form-encoded values but not
        for the path component of a URL.  Note that this default is the
        reverse of Python's urllib module.

        .. versionadded:: 3.1
           The ``plus`` argument
        """
        if encoding is None:
            if plus:
                # unquote_to_bytes doesn't have a _plus variant
                value = to_basestring(value).replace('+', ' ')
            return urllib_parse.unquote_to_bytes(value)
        else:
            unquote = (urllib_parse.unquote_plus if plus
                       else urllib_parse.unquote)
            return unquote(to_basestring(value), encoding=encoding)

    def parse_qs_bytes(qs, keep_blank_values=False, strict_parsing=False):
        """Parses a query string like urlparse.parse_qs, but returns the
        values as byte strings.

        Keys still become type str (interpreted as latin1 in python3!)
        because it's too painful to keep them as byte strings in
        python3 and in practice they're nearly always ascii anyway.
        """
        # This is gross, but python3 doesn't give us another way.
        # Latin1 is the universal donor of character encodings.
        result = _parse_qs(qs, keep_blank_values, strict_parsing,
                           encoding='latin1', errors='strict')
        encoded = {}
        for k, v in result.items():
            encoded[k] = [i.encode('latin1') for i in v]
        return encoded


_UTF8_TYPES = (bytes, type(None))


def utf8(value):
    """Converts a string argument to a byte string.

    If the argument is already a byte string or None, it is returned unchanged.
    Otherwise it must be a unicode string and is encoded as utf8.
    """
    if isinstance(value, _UTF8_TYPES):
        return value
    if not isinstance(value, unicode_type):
        raise TypeError(
            "Expected bytes, unicode, or None; got %r" % type(value)
        )
    return value.encode("utf-8")

_TO_UNICODE_TYPES = (unicode_type, type(None))


def to_unicode(value):
    """Converts a string argument to a unicode string.

    If the argument is already a unicode string or None, it is returned
    unchanged.  Otherwise it must be a byte string and is decoded as utf8.
    """
    if isinstance(value, _TO_UNICODE_TYPES):
        return value
    if not isinstance(value, bytes):
        raise TypeError(
            "Expected bytes, unicode, or None; got %r" % type(value)
        )
    return value.decode("utf-8")

# to_unicode was previously named _unicode not because it was private,
# but to avoid conflicts with the built-in unicode() function/type
_unicode = to_unicode

# When dealing with the standard library across python 2 and 3 it is
# sometimes useful to have a direct conversion to the native string type
if str is unicode_type:
    native_str = to_unicode
else:
    native_str = utf8

_BASESTRING_TYPES = (basestring_type, type(None))


def to_basestring(value):
    """Converts a string argument to a subclass of basestring.

    In python2, byte and unicode strings are mostly interchangeable,
    so functions that deal with a user-supplied argument in combination
    with ascii string constants can use either and should return the type
    the user supplied.  In python3, the two types are not interchangeable,
    so this method is needed to convert byte strings to unicode.
    """
    if isinstance(value, _BASESTRING_TYPES):
        return value
    if not isinstance(value, bytes):
        raise TypeError(
            "Expected bytes, unicode, or None; got %r" % type(value)
        )
    return value.decode("utf-8")


def recursive_unicode(obj):
    """Walks a simple data structure, converting byte strings to unicode.

    Supports lists, tuples, and dictionaries.
    """
    if isinstance(obj, dict):
        return dict((recursive_unicode(k), recursive_unicode(v)) for (k, v) in obj.items())
    elif isinstance(obj, list):
        return list(recursive_unicode(i) for i in obj)
    elif isinstance(obj, tuple):
        return tuple(recursive_unicode(i) for i in obj)
    elif isinstance(obj, bytes):
        return to_unicode(obj)
    else:
        return obj

# I originally used the regex from
# http://daringfireball.net/2010/07/improved_regex_for_matching_urls
# but it gets all exponential on certain patterns (such as too many trailing
# dots), causing the regex matcher to never return.
# This regex should avoid those problems.
# Use to_unicode instead of tornado.util.u - we don't want backslashes getting
# processed as escapes.
_URL_RE = re.compile(to_unicode(r"""\b((?:([\w-]+):(/{1,3})|www[.])(?:(?:(?:[^\s&()]|&amp;|&quot;)*(?:[^!"#$%&'()*+,.:;<=>?@\[\]^`{|}~\s]))|(?:\((?:[^\s&()]|&amp;|&quot;)*\)))+)"""))


def linkify(text, shorten=False, extra_params="",
            require_protocol=False, permitted_protocols=["http", "https"]):
    """Converts plain text into HTML with links.

    For example: ``linkify("Hello http://tornadoweb.org!")`` would return
    ``Hello <a href="http://tornadoweb.org">http://tornadoweb.org</a>!``

    Parameters:

    * ``shorten``: Long urls will be shortened for display.

    * ``extra_params``: Extra text to include in the link tag, or a callable
        taking the link as an argument and returning the extra text
        e.g. ``linkify(text, extra_params='rel="nofollow" class="external"')``,
        or::

            def extra_params_cb(url):
                if url.startswith("http://example.com"):
                    return 'class="internal"'
                else:
                    return 'class="external" rel="nofollow"'
            linkify(text, extra_params=extra_params_cb)

    * ``require_protocol``: Only linkify urls which include a protocol. If
        this is False, urls such as www.facebook.com will also be linkified.

    * ``permitted_protocols``: List (or set) of protocols which should be
        linkified, e.g. ``linkify(text, permitted_protocols=["http", "ftp",
        "mailto"])``. It is very unsafe to include protocols such as
        ``javascript``.
    """
    if extra_params and not callable(extra_params):
        extra_params = " " + extra_params.strip()

    def make_link(m):
        url = m.group(1)
        proto = m.group(2)
        if require_protocol and not proto:
            return url  # not protocol, no linkify

        if proto and proto not in permitted_protocols:
            return url  # bad protocol, no linkify

        href = m.group(1)
        if not proto:
            href = "http://" + href   # no proto specified, use http

        if callable(extra_params):
            params = " " + extra_params(href).strip()
        else:
            params = extra_params

        # clip long urls. max_len is just an approximation
        max_len = 30
        if shorten and len(url) > max_len:
            before_clip = url
            if proto:
                proto_len = len(proto) + 1 + len(m.group(3) or "")  # +1 for :
            else:
                proto_len = 0

            parts = url[proto_len:].split("/")
            if len(parts) > 1:
                # Grab the whole host part plus the first bit of the path
                # The path is usually not that interesting once shortened
                # (no more slug, etc), so it really just provides a little
                # extra indication of shortening.
                url = url[:proto_len] + parts[0] + "/" + \
                    parts[1][:8].split('?')[0].split('.')[0]

            if len(url) > max_len * 1.5:  # still too long
                url = url[:max_len]

            if url != before_clip:
                amp = url.rfind('&')
                # avoid splitting html char entities
                if amp > max_len - 5:
                    url = url[:amp]
                url += "..."

                if len(url) >= len(before_clip):
                    url = before_clip
                else:
                    # full url is visible on mouse-over (for those who don't
                    # have a status bar, such as Safari by default)
                    params += ' title="%s"' % href

        return u('<a href="%s"%s>%s</a>') % (href, params, url)

    # First HTML-escape so that our strings are all safe.
    # The regex is modified to avoid character entites other than &amp; so
    # that we won't pick up &quot;, etc.
    text = _unicode(xhtml_escape(text))
    return _URL_RE.sub(make_link, text)


def _convert_entity(m):
    if m.group(1) == "#":
        try:
            if m.group(2)[:1].lower() == 'x':
                return unichr(int(m.group(2)[1:], 16))
            else:
                return unichr(int(m.group(2)))
        except ValueError:
            return "&#%s;" % m.group(2)
    try:
        return _HTML_UNICODE_MAP[m.group(2)]
    except KeyError:
        return "&%s;" % m.group(2)


def _build_unicode_map():
    unicode_map = {}
    for name, value in htmlentitydefs.name2codepoint.items():
        unicode_map[name] = unichr(value)
    return unicode_map

_HTML_UNICODE_MAP = _build_unicode_map()