(Visual FoxPro) Generate an E-way Bill

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loJsonAuth
LOCAL lnSuccess
LOCAL loJsonData
LOCAL loJsonRequestBody
LOCAL loCrypt
LOCAL loHttp
LOCAL loResp
LOCAL lnRespStatusCode
LOCAL loJson
LOCAL lnStatus
LOCAL loSbError
LOCAL loBdData
LOCAL loJsonBill
LOCAL lnEwayBillNo
LOCAL lcEwayBillDate
LOCAL lcValidUpto

* 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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonAuth = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonAuth.LoadFile("qa_data/tokens/ewayAuth.json")
IF (lnSuccess <> 1) THEN
    ? loJsonAuth.LastErrorText
    RELEASE loJsonAuth
    CANCEL
ENDIF

* 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
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonData = CreateObject('Chilkat.JsonObject')
loJsonData.UpdateString("supplyType","O")
loJsonData.UpdateString("subSupplyType","1")
loJsonData.UpdateString("docType","INV")
loJsonData.UpdateString("docNo","AW1234-2")
loJsonData.UpdateString("docDate","05/04/2018")
loJsonData.UpdateString("fromGstin","09ABDC24212B1FK")
loJsonData.UpdateString("fromTrdName","willy")
loJsonData.UpdateString("fromAddr1","3RD CROSS NO 200  19  A")
loJsonData.UpdateString("fromAddr2","GROUND FLOOR OZZY ROAD")
loJsonData.UpdateString("fromPlace","BUSY TOWN")
loJsonData.UpdateNumber("fromPincode","640033")
loJsonData.UpdateNumber("actFromStateCode","05")
loJsonData.UpdateNumber("fromStateCode","05")
loJsonData.UpdateString("toGstin","01AAAASCC10BBBB")
loJsonData.UpdateString("toTrdName","mthustra")
loJsonData.UpdateString("toAddr1","Shrek Ogre")
loJsonData.UpdateString("toAddr2","Basadronsil")
loJsonData.UpdateString("toPlace","Grifl Blagar")
loJsonData.UpdateNumber("toPincode","699988")
loJsonData.UpdateNumber("actToStateCode","29")
loJsonData.UpdateNumber("toStateCode","02")
loJsonData.UpdateNumber("totalValue","5609889")
loJsonData.UpdateNumber("cgstValue","0")
loJsonData.UpdateNumber("sgstValue","0")
loJsonData.UpdateNumber("igstValue","168296.67")
loJsonData.UpdateNumber("cessValue","224395.56")
loJsonData.UpdateString("transporterId","09ABDC24212B1FK")
loJsonData.UpdateString("transporterName","")
loJsonData.UpdateString("transDocNo","12332")
loJsonData.UpdateNumber("transMode","1")
loJsonData.UpdateString("transDistance","656")
loJsonData.UpdateString("transDocDate","10/04/2018")
loJsonData.UpdateString("vehicleNo","PBN4567")
loJsonData.UpdateString("vehicleType","R")
loJsonData.I = 0
loJsonData.UpdateString("itemList[i].productName","Wheat")
loJsonData.UpdateString("itemList[i].productDesc","Wheat")
loJsonData.UpdateNumber("itemList[i].hsnCode","1001")
loJsonData.UpdateNumber("itemList[i].quantity","4")
loJsonData.UpdateString("itemList[i].qtyUnit","BOX")
loJsonData.UpdateNumber("itemList[i].cgstRate","0")
loJsonData.UpdateNumber("itemList[i].sgstRate","0")
loJsonData.UpdateNumber("itemList[i].igstRate","3")
loJsonData.UpdateNumber("itemList[i].cessRate","4")
loJsonData.UpdateNumber("itemList[i].cessAdvol","0")
loJsonData.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..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonRequestBody = CreateObject('Chilkat.JsonObject')
loJsonRequestBody.UpdateString("action","GENEWAYBILL")

* Setup the encryptor using the decryptedSek from the jsonAuth
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')
loCrypt.CryptAlgorithm = "aes"
loCrypt.CipherMode = "ecb"
loCrypt.KeyLength = 256
loCrypt.SetEncodedKey(loJsonAuth.StringOf("decryptedSek"),"base64")
loCrypt.EncodingMode = "base64"

* Encrypt the jsonData and add it to our JSON request body
loJsonRequestBody.UpdateString("data",loCrypt.EncryptStringENC(loJsonData.Emit()))

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')

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

* POST the request to generate an e-way bill:
loResp = loHttp.PostJson2("http://ewb.wepgst.com/api/EWayBill","application/json",loJsonRequestBody.Emit())
IF (loHttp.LastMethodSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loJsonAuth
    RELEASE loJsonData
    RELEASE loJsonRequestBody
    RELEASE loCrypt
    RELEASE loHttp
    CANCEL
ENDIF

lnRespStatusCode = loResp.StatusCode
? "response status code =" + STR(lnRespStatusCode)
? "response body:"
? loResp.BodyStr

IF (lnRespStatusCode <> 200) THEN
    RELEASE loResp
    ? "Failed in some unknown way."
    RELEASE loJsonAuth
    RELEASE loJsonData
    RELEASE loJsonRequestBody
    RELEASE loCrypt
    RELEASE loHttp
    CANCEL
ENDIF

* 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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.Load(loResp.BodyStr)
RELEASE loResp

lnStatus = loJson.IntOf("status")
? "status = " + STR(lnStatus)

IF (lnStatus <> 1) THEN
    * Failed.  Base64 decode the error
    * {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
    * For an invalid password, the error is: {"errorCodes":"108"}
    * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
    loSbError = CreateObject('Chilkat.StringBuilder')
    loJson.StringOfSb("error",loSbError)
    loSbError.Decode("base64","utf-8")
    ? "error: " + loSbError.GetAsString()
    RELEASE loJsonAuth
    RELEASE loJsonData
    RELEASE loJsonRequestBody
    RELEASE loCrypt
    RELEASE loHttp
    RELEASE loJson
    RELEASE loSbError
    CANCEL
ENDIF

loJson.EmitCompact = 0
? "JSON response:"
? loJson.Emit()

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBdData = CreateObject('Chilkat.BinData')
loBdData.AppendEncoded(loJson.StringOf("data"),"base64")
loCrypt.DecryptBd(loBdData)

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonBill = CreateObject('Chilkat.JsonObject')
loJsonBill.Load(loBdData.GetString("utf-8"))

lnEwayBillNo = loJsonBill.IntOf("ewayBillNo")
? "ewayBillNo = " + STR(lnEwayBillNo)

lcEwayBillDate = loJsonBill.StringOf("ewayBillDate")
? "ewayBillDate = " + lcEwayBillDate

lcValidUpto = loJsonBill.StringOf("validUpto")
? "validUpto = " + lcValidUpto

* Sample output:

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

RELEASE loJsonAuth
RELEASE loJsonData
RELEASE loJsonRequestBody
RELEASE loCrypt
RELEASE loHttp
RELEASE loJson
RELEASE loSbError
RELEASE loBdData
RELEASE loJsonBill