(Objective-C) Generate an E-way Bill

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

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#import <CkoJsonObject.h>
#import <CkoCrypt2.h>
#import <CkoHttp.h>
#import <CkoHttpResponse.h>
#import <CkoStringBuilder.h>
#import <CkoBinData.h>
#import <NSString.h>

// 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

CkoJsonObject *jsonAuth = [[CkoJsonObject alloc] init];
BOOL success = [jsonAuth LoadFile: @"qa_data/tokens/ewayAuth.json"];
if (success != YES) {
    NSLog(@"%@",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
CkoJsonObject *jsonData = [[CkoJsonObject alloc] init];
[jsonData UpdateString: @"supplyType" value: @"O"];
[jsonData UpdateString: @"subSupplyType" value: @"1"];
[jsonData UpdateString: @"docType" value: @"INV"];
[jsonData UpdateString: @"docNo" value: @"AW1234-2"];
[jsonData UpdateString: @"docDate" value: @"05/04/2018"];
[jsonData UpdateString: @"fromGstin" value: @"09ABDC24212B1FK"];
[jsonData UpdateString: @"fromTrdName" value: @"willy"];
[jsonData UpdateString: @"fromAddr1" value: @"3RD CROSS NO 200  19  A"];
[jsonData UpdateString: @"fromAddr2" value: @"GROUND FLOOR OZZY ROAD"];
[jsonData UpdateString: @"fromPlace" value: @"BUSY TOWN"];
[jsonData UpdateNumber: @"fromPincode" numericStr: @"640033"];
[jsonData UpdateNumber: @"actFromStateCode" numericStr: @"05"];
[jsonData UpdateNumber: @"fromStateCode" numericStr: @"05"];
[jsonData UpdateString: @"toGstin" value: @"01AAAASCC10BBBB"];
[jsonData UpdateString: @"toTrdName" value: @"mthustra"];
[jsonData UpdateString: @"toAddr1" value: @"Shrek Ogre"];
[jsonData UpdateString: @"toAddr2" value: @"Basadronsil"];
[jsonData UpdateString: @"toPlace" value: @"Grifl Blagar"];
[jsonData UpdateNumber: @"toPincode" numericStr: @"699988"];
[jsonData UpdateNumber: @"actToStateCode" numericStr: @"29"];
[jsonData UpdateNumber: @"toStateCode" numericStr: @"02"];
[jsonData UpdateNumber: @"totalValue" numericStr: @"5609889"];
[jsonData UpdateNumber: @"cgstValue" numericStr: @"0"];
[jsonData UpdateNumber: @"sgstValue" numericStr: @"0"];
[jsonData UpdateNumber: @"igstValue" numericStr: @"168296.67"];
[jsonData UpdateNumber: @"cessValue" numericStr: @"224395.56"];
[jsonData UpdateString: @"transporterId" value: @"09ABDC24212B1FK"];
[jsonData UpdateString: @"transporterName" value: @""];
[jsonData UpdateString: @"transDocNo" value: @"12332"];
[jsonData UpdateNumber: @"transMode" numericStr: @"1"];
[jsonData UpdateString: @"transDistance" value: @"656"];
[jsonData UpdateString: @"transDocDate" value: @"10/04/2018"];
[jsonData UpdateString: @"vehicleNo" value: @"PBN4567"];
[jsonData UpdateString: @"vehicleType" value: @"R"];
jsonData.I = [NSNumber numberWithInt:0];
[jsonData UpdateString: @"itemList[i].productName" value: @"Wheat"];
[jsonData UpdateString: @"itemList[i].productDesc" value: @"Wheat"];
[jsonData UpdateNumber: @"itemList[i].hsnCode" numericStr: @"1001"];
[jsonData UpdateNumber: @"itemList[i].quantity" numericStr: @"4"];
[jsonData UpdateString: @"itemList[i].qtyUnit" value: @"BOX"];
[jsonData UpdateNumber: @"itemList[i].cgstRate" numericStr: @"0"];
[jsonData UpdateNumber: @"itemList[i].sgstRate" numericStr: @"0"];
[jsonData UpdateNumber: @"itemList[i].igstRate" numericStr: @"3"];
[jsonData UpdateNumber: @"itemList[i].cessRate" numericStr: @"4"];
[jsonData UpdateNumber: @"itemList[i].cessAdvol" numericStr: @"0"];
[jsonData UpdateNumber: @"itemList[i].taxableAmount" numericStr: @"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..
CkoJsonObject *jsonRequestBody = [[CkoJsonObject alloc] init];
[jsonRequestBody UpdateString: @"action" value: @"GENEWAYBILL"];

// Setup the encryptor using the decryptedSek from the jsonAuth
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.CryptAlgorithm = @"aes";
crypt.CipherMode = @"ecb";
crypt.KeyLength = [NSNumber numberWithInt:256];
[crypt SetEncodedKey: [jsonAuth StringOf: @"decryptedSek"] encoding: @"base64"];
crypt.EncodingMode = @"base64";

// Encrypt the jsonData and add it to our JSON request body
[jsonRequestBody UpdateString: @"data" value: [crypt EncryptStringENC: [jsonData Emit]]];

CkoHttp *http = [[CkoHttp alloc] init];

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

// POST the request to generate an e-way bill:
CkoHttpResponse *resp = [http PostJson2: @"http://ewb.wepgst.com/api/EWayBill" contentType: @"application/json" jsonText: [jsonRequestBody Emit]];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

int respStatusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"response status code =",respStatusCode);
NSLog(@"%@",@"response body:");
NSLog(@"%@",resp.BodyStr);

if (respStatusCode != 200) {

    NSLog(@"%@",@"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.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: resp.BodyStr];

int status = [[json IntOf: @"status"] intValue];
NSLog(@"%@%d",@"status = ",status);

if (status != 1) {
    // Failed.  Base64 decode the error
    // {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
    // For an invalid password, the error is: {"errorCodes":"108"}
    CkoStringBuilder *sbError = [[CkoStringBuilder alloc] init];
    [json StringOfSb: @"error" sb: sbError];
    [sbError Decode: @"base64" charset: @"utf-8"];
    NSLog(@"%@%@",@"error: ",[sbError GetAsString]);
    return;
}

json.EmitCompact = NO;
NSLog(@"%@",@"JSON response:");
NSLog(@"%@",[json Emit]);

CkoBinData *bdData = [[CkoBinData alloc] init];
[bdData AppendEncoded: [json StringOf: @"data"] encoding: @"base64"];
[crypt DecryptBd: bdData];

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

CkoJsonObject *jsonBill = [[CkoJsonObject alloc] init];
[jsonBill Load: [bdData GetString: @"utf-8"]];

int ewayBillNo = [[jsonBill IntOf: @"ewayBillNo"] intValue];
NSLog(@"%@%d",@"ewayBillNo = ",ewayBillNo);

NSString *ewayBillDate = [jsonBill StringOf: @"ewayBillDate"];
NSLog(@"%@%@",@"ewayBillDate = ",ewayBillDate);

NSString *validUpto = [jsonBill StringOf: @"validUpto"];
NSLog(@"%@%@",@"validUpto = ",validUpto);

// Sample output:

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