This module allows you to set the hash (as a hexadecimal string) of an arbitrary string as the value of a variable. Currently only three are available (MD5, SHA1 and Murmurhash2 (32-bit)), but more will be added later.
set_[hash] $var_name [value] set_[hash]_upper $var_name [value]
[hash] ::= md5 | sha1 | murmur2 (more to be added soon) [value] is any legal string value in Nginx, including variables
The suffix '_upper' indicates that the output should be in uppercase, otherwise any letters are displayed in lowercase.
Note : unless you have a good reason to use uppercase, you should use lowercase because the conversion to uppercase adds overhead.
log_format hashes "value : $hash_value " "md5 : $md5 $md5_upper " "murmur2 : $murmur2 $murmur2_upper " "sha1 : $sha1 $sha1_upper";
access_log /var/log/hashes.log hashes;
server {
location / {
set $hash_value $request_uri;
set_md5 $md5 $hash_value;
set_murmur2 $murmur2 $hash_value;
set_sha1 $sha1 $hash_value;
set_md5_upper $md5_upper $hash_value;
set_murmur2_upper $murmur2_upper $hash_value;
set_sha1_upper $sha1_upper $hash_value;
}
}
This will log the md5/murmurhash 2/sha hash values of $request_uri to the log file.
To install, you must compile Nginx with OpenSSL and the Nginx Development Kit
./configure
--add-module=/path/to/ngx_devel_kit
--add-module=/path/to/ngx_http_set_hash
make
make install
Note : If Nginx can't find your system's OpenSSL shared libraries and headers, you will either want to install the devel version using your package manager, e.g.
apt-get/yum install openssl-dev
or specify a path to a directory where you have extracted the OpenSSL source code :
./ configure --with-openssl=/path/to/openssl ...
Note : This module will work ok with the latest version of Agentzh's set_misc module, and the result will be the same.
- More hash functions
BSD
Marcus Clyne (c) 2010