BUG: UTF-8 reencoding inside sa-ldapsearch ldapfilter

[matejkaj]

Hello,
I'd like to report a bug in following plugin:
Splunk Supporting Add-on for Active Directory
If you run a search that yield non-ascii fields and you pass them as parameters into ldapfilter, the search fails with an error.
Example:

| ldapsearch search="(cn=Ůïkëllok Řúxľif)" attrs="distinguishedName"| ldapfilter search="(distinguishedName=$distinguishedName$)" attrs="cn"

The subsequent ldapfilter crashes with following trace:

  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/ldapfilter.py", line 117, in stream
    for entry in entry_generator:
  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/packages/ldap3/extend/standard/PagedSearch.py", line 57, in paged_search_generator
    None if cookie is True else cookie)
  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/packages/ldap3/core/connection.py", line 398, in search
    request = search_operation(search_base, search_filter, search_scope, dereference_aliases, attributes, size_limit, time_limit, types_only, self.server.schema if self.server and self.check_names else None)
  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/packages/ldap3/operation/search.py", line 356, in search_operation
    request['filter'] = build_filter(search_filter, schema)  # parse the searchFilter string and compile it starting from the root node
  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/packages/ldap3/operation/search.py", line 307, in build_filter
    return compile_filter(parse_filter(search_filter, schema).elements[0])
  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/packages/ldap3/operation/search.py", line 215, in parse_filter
    current_node.append(evaluate_match(search_filter[start_pos:end_pos], schema))
  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/packages/ldap3/operation/search.py", line 175, in evaluate_match
    assertion = {'attr': left_part, 'value': validate_assertion_value(schema, left_part, right_part)}
  File "/opt/splunk/etc/apps/SA-ldapsearch/bin/packages/ldap3/protocol/convert.py", line 164, in validate_assertion_value
    validated_value += value[pos].encode('utf-8', errors='ignore')
UnicodeDecodeError: 'utf8' codec can't decode byte 0xc4 in position 0: unexpected end of data

Possible workaround: simply remove ".encode('utf-8', errors='ignore')"

Please fix this issue.
Thanks!