Requests signing using HMAC authentication with TYK Gateway

postman-prerequest-tyk-hmac.js

# An example of adding requests signature using HMAC authentication with TYK Gateway.

var sdk = require('postman-collection'),
    apiKey = environment.api_key,
    apiSecret = environment.api_secret,
    date = (new Date()).toUTCString(),
    signatureContentString = 'date: ' + date,
    signatureString = CryptoJS.HmacSHA1(signatureContentString, apiSecret).toString(CryptoJS.enc.Base64),
    authHeader = 'Signature keyId="' + apiKey + '",algorithm="hmac-sha1",signature="' +  encodeURIComponent(signatureString) + '"';

pm.environment.set("authHeader", authHeader);
pm.environment.set("date", date);

# Use these variables in Authorization header and Date header