deflate/inflate data in an irule

Hi, I don't know your exactly goal to the SAML, but maybe you can do the deflate/inflate with the zlib library from node.js with iRule LX. In the example below, I just created a workspace, plugin then an iRule and it has worked (at least on my lab :).

I hope it helps!

My iRule LX scenario hierarchy:

ilx_plugin   
    ilx_workspace    
        ilx_extension    
            index.js    
        rules    
            ilx_rule    

index.js

'use strict'
var f5 = require('f5-nodejs');
var zlib = require('zlib');

var ilx = new f5.ILXServer();

ilx.addMethod('deflate_b64', function(req, res) {
    var zip64 = zlib.deflateSync(req.params()[0]).toString('base64');
    res.reply(zip64);
});

ilx.addMethod('inflate_b64', function(req, res) {
    var unzip = zlib.inflateSync(new Buffer(req.params()[0], 'base64')).toString();
    res.reply(unzip);
});

ilx.listen();

ilx_rule

when HTTP_REQUEST {
    set handle [ILX::init "ilx_plugin" "ilx_extension"]
    set b64response [ILX::call $handle "deflate_b64" "My string to deflate and base64 encoding"]
    log local0. "Deflate response: $b64response"

    set response [ILX::call $handle "inflate_b64" $b64response]
    log local0. "Inflate response: $response"
}

Result:

Apr  4 12:32:01 bigiplab info tmm2[19039]: Rule /Common/ilx_plugin/ilx_rule : Deflate response: eJzzrVQoLinKzEtXKMlXSElNy0ksSVVIzEtRSEosTjUzUUjNS85PAUoDACY7DlU=
Apr  4 12:32:01 bigiplab info tmm2[19039]: Rule /Common/ilx_plugin/ilx_rule : Inflate response: My string to deflate and base64 encoding