(JavaScript) Generate an E-way Bill

Demonstrates how to send an HTTP POST request to generate an e-way bill.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example uses the previously obtained access token that was retrieved
// in this example:  Get EWAY Auth Token using Gstin, username, password, and app_key

var jsonAuth = new CkJsonObject();
success = jsonAuth.LoadFile("qa_data/tokens/ewayAuth.json");
if (success == false) {
    console.log(jsonAuth.LastErrorText);
    return;
}

// The jsonAuth contains something like this:
// {
//   "authToken": "IBTeFtxNfVurg71LTzZ2r0xK7",
//   "decryptedSek": "5g1TyTie7yoslU3DrbYATa7mWyPazlODE7cEh5Vy4Ho="
// }

// Generate the JSON data for the e-way bill.
// The following code can be generated by pasting representative JSON into this online tool:
// Generate JSON Code
var jsonData = new CkJsonObject();
jsonData.UpdateString("supplyType","O");
jsonData.UpdateString("subSupplyType","1");
jsonData.UpdateString("docType","INV");
jsonData.UpdateString("docNo","AW1234-2");
jsonData.UpdateString("docDate","05/04/2018");
jsonData.UpdateString("fromGstin","09ABDC24212B1FK");
jsonData.UpdateString("fromTrdName","willy");
jsonData.UpdateString("fromAddr1","3RD CROSS NO 200  19  A");
jsonData.UpdateString("fromAddr2","GROUND FLOOR OZZY ROAD");
jsonData.UpdateString("fromPlace","BUSY TOWN");
jsonData.UpdateNumber("fromPincode","640033");
jsonData.UpdateNumber("actFromStateCode","05");
jsonData.UpdateNumber("fromStateCode","05");
jsonData.UpdateString("toGstin","01AAAASCC10BBBB");
jsonData.UpdateString("toTrdName","mthustra");
jsonData.UpdateString("toAddr1","Shrek Ogre");
jsonData.UpdateString("toAddr2","Basadronsil");
jsonData.UpdateString("toPlace","Grifl Blagar");
jsonData.UpdateNumber("toPincode","699988");
jsonData.UpdateNumber("actToStateCode","29");
jsonData.UpdateNumber("toStateCode","02");
jsonData.UpdateNumber("totalValue","5609889");
jsonData.UpdateNumber("cgstValue","0");
jsonData.UpdateNumber("sgstValue","0");
jsonData.UpdateNumber("igstValue","168296.67");
jsonData.UpdateNumber("cessValue","224395.56");
jsonData.UpdateString("transporterId","09ABDC24212B1FK");
jsonData.UpdateString("transporterName","");
jsonData.UpdateString("transDocNo","12332");
jsonData.UpdateNumber("transMode","1");
jsonData.UpdateString("transDistance","656");
jsonData.UpdateString("transDocDate","10/04/2018");
jsonData.UpdateString("vehicleNo","PBN4567");
jsonData.UpdateString("vehicleType","R");
jsonData.I = 0;
jsonData.UpdateString("itemList[i].productName","Wheat");
jsonData.UpdateString("itemList[i].productDesc","Wheat");
jsonData.UpdateNumber("itemList[i].hsnCode","1001");
jsonData.UpdateNumber("itemList[i].quantity","4");
jsonData.UpdateString("itemList[i].qtyUnit","BOX");
jsonData.UpdateNumber("itemList[i].cgstRate","0");
jsonData.UpdateNumber("itemList[i].sgstRate","0");
jsonData.UpdateNumber("itemList[i].igstRate","3");
jsonData.UpdateNumber("itemList[i].cessRate","4");
jsonData.UpdateNumber("itemList[i].cessAdvol","0");
jsonData.UpdateNumber("itemList[i].taxableAmount","5609889");

// The body of the HTTP POST will contain JSON that looks like this:
// 	{
// 	"action":"GENEWAYBILL",
// 	"data": " iJiJGXq ... oUZp/25Y "
// 	}

// The "data" is the encrypted jsonData using our previously agreed-upon symmetric encryption key.
// Let's begin build the JSON request body..
var jsonRequestBody = new CkJsonObject();
jsonRequestBody.UpdateString("action","GENEWAYBILL");

// Setup the encryptor using the decryptedSek from the jsonAuth
var crypt = new CkCrypt2();
crypt.CryptAlgorithm = "aes";
crypt.CipherMode = "ecb";
crypt.KeyLength = 256;
crypt.SetEncodedKey(jsonAuth.StringOf("decryptedSek"),"base64");
crypt.EncodingMode = "base64";

// Encrypt the jsonData and add it to our JSON request body
jsonRequestBody.UpdateString("data",crypt.EncryptStringENC(jsonData.Emit()));

var http = new CkHttp();

// Add the authtoken to the request header.
// Be careful to be precise with uppercase/lowercase ("authtoken" vs "authToken")
http.SetRequestHeader("authtoken",jsonAuth.StringOf("authToken"));
http.SetRequestHeader("Gstin","09ABDC24212B1FK");
http.Accept = "application/json";

// POST the request to generate an e-way bill:
var resp = new CkHttpResponse();
success = http.HttpJson("POST","http://ewb.wepgst.com/api/EWayBill",jsonRequestBody,"application/json",resp);
if (success == false) {
    console.log(http.LastErrorText);
    return;
}

var respStatusCode = resp.StatusCode;
console.log("response status code =" + respStatusCode);
console.log("response body:");
console.log(resp.BodyStr);

if (respStatusCode !== 200) {
    console.log("Failed in some unknown way.");
    return;
}

// When the response status code = 200, we'll have either
// success response like this:
//  {"status":"1","data":"..."}
// 
// or a failed response like this:
// 
// {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}

// Load the response body into a JSON object.
var json = new CkJsonObject();
json.Load(resp.BodyStr);

var status = json.IntOf("status");
console.log("status = " + status);

if (status !== 1) {
    // Failed.  Base64 decode the error
    // {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
    // For an invalid password, the error is: {"errorCodes":"108"}
    var sbError = new CkStringBuilder();
    json.StringOfSb("error",sbError);
    sbError.Decode("base64","utf-8");
    console.log("error: " + sbError.GetAsString());
    return;
}

json.EmitCompact = false;
console.log("JSON response:");
console.log(json.Emit());

var bdData = new CkBinData();
bdData.AppendEncoded(json.StringOf("data"),"base64");
crypt.DecryptBd(bdData);

// Decrypts to 
// {"ewayBillNo":331001121234,"ewayBillDate":"24/05/2018 04:38:00 PM","validUpto":"31/05/2018 11:59:00 PM"}

var jsonBill = new CkJsonObject();
jsonBill.Load(bdData.GetString("utf-8"));

var ewayBillNo = jsonBill.IntOf("ewayBillNo");
console.log("ewayBillNo = " + ewayBillNo);

var ewayBillDate = jsonBill.StringOf("ewayBillDate");
console.log("ewayBillDate = " + ewayBillDate);

var validUpto = jsonBill.StringOf("validUpto");
console.log("validUpto = " + validUpto);

// Sample output:

// ewayBillNo = 331001121234
// ewayBillDate = 24/05/2018 04:55:00 PM
// validUpto = 31/05/2018 11:59:00 PM