1 -- Escape a string to be used as safe LDAP filter

2 -- --------------------------------------------------------------------------

3 --

4 -- arguments:

5 -- filter: the string to be escaped (required)

6 --

7 -- returns:

8 -- escaped_filter: the escaped result

9

10 function ldap.escape_filter(filter)

11

12 local null_pattern = (_VERSION == "Lua 5.1") and "%z" or "\000"

13

14 return string.gsub(filter, "[\\%*%(%)\128-\255" .. null_pattern .. "]", function (char)

15

16 return string.format("%02x", string.byte(char))

17

18 end)

19

20 end