26b3a40133
* INCR-108: Run python-modernize on openedx/core/lib * Fixed urlencode import * Fixed diff quality warnings and six.string_types error * Fixed pickle import * Fixed iteritems import * Fixed ungrouped imports * Fixed six.moves import issues
55 lines
1.3 KiB
Python
55 lines
1.3 KiB
Python
"""
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Contains common utilities for URL escaping.
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"""
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from __future__ import absolute_import
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import re
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def quote_slashes(text):
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"""
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Quote '/' characters so that they aren't visible to
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django's url quoting, unquoting, or url regex matching.
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Escapes '/'' to the sequence ';_', and ';' to the sequence
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';;'. By making the escape sequence fixed length, and escaping
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identifier character ';', we are able to reverse the escaping.
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"""
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return re.sub(r'[;/]', _quote_slashes, text)
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def unquote_slashes(text):
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"""
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Unquote slashes quoted by `quote_slashes`
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"""
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return re.sub(r'(;;|;_)', _unquote_slashes, text)
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def _quote_slashes(match):
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"""
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Helper function for `quote_slashes`
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"""
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matched = match.group(0)
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# We have to escape ';', because that is our
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# escape sequence identifier (otherwise, the escaping)
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# couldn't distinguish between us adding ';_' to the string
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# and ';_' appearing naturally in the string
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if matched == ';':
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return ';;'
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elif matched == '/':
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return ';_'
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else:
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return matched
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def _unquote_slashes(match):
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"""
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Helper function for `unquote_slashes`
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"""
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matched = match.group(0)
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if matched == ';;':
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return ';'
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elif matched == ';_':
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return '/'
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else:
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return matched
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