(Ruby) Generate an E-way Bill

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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

#  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::CkJsonObject.new()
success = jsonAuth.LoadFile("qa_data/tokens/ewayAuth.json")
if (success != true)
    print jsonAuth.lastErrorText() + "\n";
    exit
end

#  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::CkJsonObject.new()
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.put_I(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::CkJsonObject.new()
jsonRequestBody.UpdateString("action","GENEWAYBILL")

#  Setup the encryptor using the decryptedSek from the jsonAuth
crypt = Chilkat::CkCrypt2.new()
crypt.put_CryptAlgorithm("aes")
crypt.put_CipherMode("ecb")
crypt.put_KeyLength(256)
crypt.SetEncodedKey(jsonAuth.stringOf("decryptedSek"),"base64")
crypt.put_EncodingMode("base64")

#  Encrypt the jsonData and add it to our JSON request body
jsonRequestBody.UpdateString("data",crypt.encryptStringENC(jsonData.emit()))

http = Chilkat::CkHttp.new()

#  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.put_Accept("application/json")

#  POST the request to generate an e-way bill:
# resp is a CkHttpResponse
resp = http.PostJson2("http://ewb.wepgst.com/api/EWayBill","application/json",jsonRequestBody.emit())
if (http.get_LastMethodSuccess() != true)
    print http.lastErrorText() + "\n";
    exit
end

respStatusCode = resp.get_StatusCode()
print "response status code =" + respStatusCode.to_s() + "\n";
print "response body:" + "\n";
print resp.bodyStr() + "\n";

if (respStatusCode != 200)

    print "Failed in some unknown way." + "\n";
    exit
end

#  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::CkJsonObject.new()
json.Load(resp.bodyStr())

status = json.IntOf("status")
print "status = " + status.to_s() + "\n";

if (status != 1)
    #  Failed.  Base64 decode the error
    # {"status":"0","error":"eyJlcnJvckNvZGVzIjoiMTA4In0="}
    #  For an invalid password, the error is: {"errorCodes":"108"}
    sbError = Chilkat::CkStringBuilder.new()
    json.StringOfSb("error",sbError)
    sbError.Decode("base64","utf-8")
    print "error: " + sbError.getAsString() + "\n";
    exit
end

json.put_EmitCompact(false)
print "JSON response:" + "\n";
print json.emit() + "\n";

bdData = Chilkat::CkBinData.new()
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::CkJsonObject.new()
jsonBill.Load(bdData.getString("utf-8"))

ewayBillNo = jsonBill.IntOf("ewayBillNo")
print "ewayBillNo = " + ewayBillNo.to_s() + "\n";

ewayBillDate = jsonBill.stringOf("ewayBillDate")
print "ewayBillDate = " + ewayBillDate + "\n";

validUpto = jsonBill.stringOf("validUpto")
print "validUpto = " + validUpto + "\n";

#  Sample output:

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