Postman - Quicblox signature pre-request script.

postman_quickblox_signature.js

function setRequestBody(httpMethod, requestBody) {
    var timestamp = ~~(Date.now()/1000); // easy way to get required type timestamp
    var REQUEST = {  
   "application_id":"xxxxxx", // your own application_id
   "auth_key":"yyyy", // your own auth_key
   "timestamp":timestamp,
   "nonce":timestamp,
   "signature":""
    }
    
    // i have used QB-Secure global variable so you can too.
    var SECRET_KEY = pm.globals.get("QB-Secure"); 

    // preparing request/signature data
    var requestData = ['application_id='+REQUEST.application_id,'auth_key='+REQUEST.auth_key,'nonce='+timestamp,'timestamp='+timestamp].join("&");
    
    // creating signature
    var hmacDigest = CryptoJS.enc.Hex.stringify(CryptoJS.HmacSHA1(requestData, SECRET_KEY));
    REQUEST.signature=hmacDigest;

    // setting request body as environment so we can use it in our json body via {{QB-RequestBody}}
    // you can check the first comment, it has screenshot.
    pm.environment.set('QB-RequestBody',JSON.stringify(REQUEST));
    
    //console out for debug purposes
    console.log(requestData,REQUEST);
}

setRequestBody(request['method'], request['data']);