(Go) Generate an E-way Bill

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

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    // 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

    jsonAuth := chilkat.NewJsonObject()
    success := jsonAuth.LoadFile("qa_data/tokens/ewayAuth.json")
    if success != true {
        fmt.Println(jsonAuth.LastErrorText())
        jsonAuth.DisposeJsonObject()
        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
    jsonData := chilkat.NewJsonObject()
    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.SetI(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..
    jsonRequestBody := chilkat.NewJsonObject()
    jsonRequestBody.UpdateString("action","GENEWAYBILL")

    // Setup the encryptor using the decryptedSek from the jsonAuth
    crypt := chilkat.NewCrypt2()
    crypt.SetCryptAlgorithm("aes")
    crypt.SetCipherMode("ecb")
    crypt.SetKeyLength(256)
    crypt.SetEncodedKey(*jsonAuth.StringOf("decryptedSek"),"base64")
    crypt.SetEncodingMode("base64")

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

    http := chilkat.NewHttp()

    // 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.SetAccept("application/json")

    // POST the request to generate an e-way bill:
    resp := http.PostJson2("http://ewb.wepgst.com/api/EWayBill","application/json",*jsonRequestBody.Emit())
    if http.LastMethodSuccess() != true {
        fmt.Println(http.LastErrorText())
        jsonAuth.DisposeJsonObject()
        jsonData.DisposeJsonObject()
        jsonRequestBody.DisposeJsonObject()
        crypt.DisposeCrypt2()
        http.DisposeHttp()
        return
    }

    respStatusCode := resp.StatusCode()
    fmt.Println("response status code =", respStatusCode)
    fmt.Println("response body:")
    fmt.Println(resp.BodyStr())

    if respStatusCode != 200 {
        resp.DisposeHttpResponse()
        fmt.Println("Failed in some unknown way.")
        jsonAuth.DisposeJsonObject()
        jsonData.DisposeJsonObject()
        jsonRequestBody.DisposeJsonObject()
        crypt.DisposeCrypt2()
        http.DisposeHttp()
        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.
    json := chilkat.NewJsonObject()
    json.Load(resp.BodyStr())
    resp.DisposeHttpResponse()

    status := json.IntOf("status")
    fmt.Println("status = ", status)

    if status != 1 {
        // Failed.  Base64 decode the error
        // {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
        // For an invalid password, the error is: {"errorCodes":"108"}
        sbError := chilkat.NewStringBuilder()
        json.StringOfSb("error",sbError)
        sbError.Decode("base64","utf-8")
        fmt.Println("error: ", *sbError.GetAsString())
        jsonAuth.DisposeJsonObject()
        jsonData.DisposeJsonObject()
        jsonRequestBody.DisposeJsonObject()
        crypt.DisposeCrypt2()
        http.DisposeHttp()
        json.DisposeJsonObject()
        sbError.DisposeStringBuilder()
        return
    }

    json.SetEmitCompact(false)
    fmt.Println("JSON response:")
    fmt.Println(*json.Emit())

    bdData := chilkat.NewBinData()
    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"}

    jsonBill := chilkat.NewJsonObject()
    jsonBill.Load(*bdData.GetString("utf-8"))

    ewayBillNo := jsonBill.IntOf("ewayBillNo")
    fmt.Println("ewayBillNo = ", ewayBillNo)

    ewayBillDate := jsonBill.StringOf("ewayBillDate")
    fmt.Println("ewayBillDate = ", *ewayBillDate)

    validUpto := jsonBill.StringOf("validUpto")
    fmt.Println("validUpto = ", *validUpto)

    // Sample output:

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

    jsonAuth.DisposeJsonObject()
    jsonData.DisposeJsonObject()
    jsonRequestBody.DisposeJsonObject()
    crypt.DisposeCrypt2()
    http.DisposeHttp()
    json.DisposeJsonObject()
    sbError.DisposeStringBuilder()
    bdData.DisposeBinData()
    jsonBill.DisposeJsonObject()