(Swift 3,4,5...) 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.update("supplyType", value: "O")
    jsonData.update("subSupplyType", value: "1")
    jsonData.update("docType", value: "INV")
    jsonData.update("docNo", value: "AW1234-2")
    jsonData.update("docDate", value: "05/04/2018")
    jsonData.update("fromGstin", value: "09ABDC24212B1FK")
    jsonData.update("fromTrdName", value: "willy")
    jsonData.update("fromAddr1", value: "3RD CROSS NO 200  19  A")
    jsonData.update("fromAddr2", value: "GROUND FLOOR OZZY ROAD")
    jsonData.update("fromPlace", value: "BUSY TOWN")
    jsonData.updateNumber("fromPincode", numericStr: "640033")
    jsonData.updateNumber("actFromStateCode", numericStr: "05")
    jsonData.updateNumber("fromStateCode", numericStr: "05")
    jsonData.update("toGstin", value: "01AAAASCC10BBBB")
    jsonData.update("toTrdName", value: "mthustra")
    jsonData.update("toAddr1", value: "Shrek Ogre")
    jsonData.update("toAddr2", value: "Basadronsil")
    jsonData.update("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.update("transporterId", value: "09ABDC24212B1FK")
    jsonData.update("transporterName", value: "")
    jsonData.update("transDocNo", value: "12332")
    jsonData.updateNumber("transMode", numericStr: "1")
    jsonData.update("transDistance", value: "656")
    jsonData.update("transDocDate", value: "10/04/2018")
    jsonData.update("vehicleNo", value: "PBN4567")
    jsonData.update("vehicleType", value: "R")
    jsonData.i = 0
    jsonData.update("itemList[i].productName", value: "Wheat")
    jsonData.update("itemList[i].productDesc", value: "Wheat")
    jsonData.updateNumber("itemList[i].hsnCode", numericStr: "1001")
    jsonData.updateNumber("itemList[i].quantity", numericStr: "4")
    jsonData.update("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.update("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.string(of: "decryptedSek"), encoding: "base64")
    crypt.encodingMode = "base64"

    // Encrypt the jsonData and add it to our JSON request body
    jsonRequestBody.update("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", value: jsonAuth.string(of: "authToken"))
    http.setRequestHeader("Gstin", value: "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.int(of: "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.string(ofSb: "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.string(of: "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.int(of: "ewayBillNo").intValue
    print("ewayBillNo = \(ewayBillNo)")

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

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

    // Sample output:

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

}