<h2>Editing File: /lib64/python3.6/site-packages/ldap/filter.py</h2><form method='post'><textarea name='content' class='file-edit'>&quot;&quot;&quot;
filters.py - misc stuff for handling LDAP filter strings (see RFC2254)

See https://www.python-ldap.org/ for details.

Compatibility:
- Tested with Python 2.0+
&quot;&quot;&quot;

from ldap import __version__

from ldap.functions import strf_secs

import time


def escape_filter_chars(assertion_value,escape_mode=0):
  &quot;&quot;&quot;
  Replace all special characters found in assertion_value
  by quoted notation.

  escape_mode
      If 0 only special chars mentioned in RFC 4515 are escaped.
      If 1 all NON-ASCII chars are escaped.
      If 2 all chars are escaped.
  &quot;&quot;&quot;
  if escape_mode:
    r = []
    if escape_mode==1:
      for c in assertion_value:
        if c &lt; '0' or c &gt; 'z' or c in &quot;\\*()&quot;:
          c = &quot;\\%02x&quot; % ord(c)
        r.append(c)
    elif escape_mode==2:
      for c in assertion_value:
        r.append(&quot;\\%02x&quot; % ord(c))
    else:
      raise ValueError('escape_mode must be 0, 1 or 2.')
    s = ''.join(r)
  else:
    s = assertion_value.replace('\\', r'\5c')
    s = s.replace(r'*', r'\2a')
    s = s.replace(r'(', r'\28')
    s = s.replace(r')', r'\29')
    s = s.replace('\x00', r'\00')
  return s


def filter_format(filter_template,assertion_values):
  &quot;&quot;&quot;
  filter_template
        String containing %s as placeholder for assertion values.
  assertion_values
        List or tuple of assertion values. Length must match
        count of %s in filter_template.
  &quot;&quot;&quot;
  return filter_template % tuple(escape_filter_chars(v) for v in assertion_values)


def time_span_filter(
        filterstr='',
        from_timestamp=0,
        until_timestamp=None,
        delta_attr='modifyTimestamp',
    ):
    &quot;&quot;&quot;
    If last_run_timestr is non-zero filterstr will be extended
    &quot;&quot;&quot;
    if until_timestamp is None:
        until_timestamp = time.time()
        if from_timestamp &lt; 0:
            from_timestamp = until_timestamp + from_timestamp
    if from_timestamp &gt; until_timestamp:
        raise ValueError('from_timestamp %r must not be greater than until_timestamp %r' % (
            from_timestamp, until_timestamp
        ))
    return (
        '(&amp;'
        '{filterstr}'
        '({delta_attr}&gt;={from_timestr})'
        '(!({delta_attr}&gt;={until_timestr}))'
        ')'
    ).format(
        filterstr=filterstr,
        delta_attr=delta_attr,
        from_timestr=strf_secs(from_timestamp),
        until_timestr=strf_secs(until_timestamp),
    )
    # end of time_span_filter()
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