Pre-request script for Postman calling api.comcar.co.uk/v1/

pre-request.js

// build the hash
var current_timestamp = ((new Date()).getTime() / 1000).toFixed();
postman.setEnvironmentVariable('this_timestamp', current_timestamp );

postman.setEnvironmentVariable('this_nonce', Math.floor( Math.random() * 10000 ));

// the message is made up of the order/filter etc params
// params need to be put into alphabetical order
var current_message = '';
var query_params = postman.__execution.request.url.query;
var struct_params = {};

// make a simple struct of key/value pairs
query_params.each(function(param){
    // check if the key is not disabled
    if( !param.disabled ) {
        struct_params[ param.key ] = param.value;
    }
});

// make an ordered array of key names
var arr_param_names = Object.keys( struct_params ).sort();

// add the params in order to the message
arr_param_names.each(function(param){
    // get the value, blank if it's null
    var val = struct_params[ param ]||'';
    // if the value is not blank, add it to the message
    if( val !== '' ) {
        current_message+=param+'='+val;
    }
});

var combined_data = environment.api_key
				+ current_message
				+ environment.api_secret
				+ environment.this_nonce
				+ environment.this_timestamp
			
			console.log( combined_data )	
			
				
// make lower case
combined_data = combined_data.toLowerCase();

generated_hash = CryptoJS.SHA256( combined_data );

postman.setEnvironmentVariable('generated_hash', generated_hash);