(Swift) Generate an E-way Bill

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

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func chilkatTest() {
    //  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

    let jsonAuth = CkoJsonObject()
    var success: Bool = jsonAuth.LoadFile("qa_data/tokens/ewayAuth.json")
    if success != true {
        print("\(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
    let jsonData = CkoJsonObject()
    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 = 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..
    let jsonRequestBody = CkoJsonObject()
    jsonRequestBody.UpdateString("action", value: "GENEWAYBILL")

    //  Setup the encryptor using the decryptedSek from the jsonAuth
    let crypt = CkoCrypt2()
    crypt.CryptAlgorithm = "aes"
    crypt.CipherMode = "ecb"
    crypt.KeyLength = 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()))

    let http = CkoHttp()

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

    //  POST the request to generate an e-way bill:
    var resp: CkoHttpResponse? = http.PostJson2("http://ewb.wepgst.com/api/EWayBill", contentType: "application/json", jsonText: jsonRequestBody.Emit())
    if http.LastMethodSuccess != true {
        print("\(http.LastErrorText)")
        return
    }

    var respStatusCode: Int = resp!.StatusCode.intValue
    print("response status code =\(respStatusCode)")
    print("response body:")
    print("\(resp!.BodyStr)")

    if respStatusCode != 200 {
        resp = nil
        print("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.
    let json = CkoJsonObject()
    json.Load(resp!.BodyStr)
    resp = nil

    var status: Int = json.IntOf("status").intValue
    print("status = \(status)")

    if status != 1 {
        //  Failed.  Base64 decode the error
        // {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
        //  For an invalid password, the error is: {"errorCodes":"108"}
        let sbError = CkoStringBuilder()
        json.StringOfSb("error", sb: sbError)
        sbError.Decode("base64", charset: "utf-8")
        print("error: \(sbError.GetAsString())")
        return
    }

    json.EmitCompact = false
    print("JSON response:")
    print("\(json.Emit())")

    let bdData = CkoBinData()
    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"}

    let jsonBill = CkoJsonObject()
    jsonBill.Load(bdData.GetString("utf-8"))

    var ewayBillNo: Int = jsonBill.IntOf("ewayBillNo").intValue
    print("ewayBillNo = \(ewayBillNo)")

    var ewayBillDate: String? = jsonBill.StringOf("ewayBillDate")
    print("ewayBillDate = \(ewayBillDate!)")

    var validUpto: String? = jsonBill.StringOf("validUpto")
    print("validUpto = \(validUpto!)")

    //  Sample output:

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

}