(Lianja) Sign ITIDA JSON and Send to ETA (Egypt Tax Authority) Portal

See more Egypt ITIDA Examples

Demonstrates how to ITIDA canonicalize JSON, create signature, and send to the ETA Portal.

Chilkat Lianja Extension Download Chilkat Lianja Extension

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loCrypt = createobject("CkCrypt2")
loCrypt.VerboseLogging = .T.

loCert = createobject("CkCert")
loCert.VerboseLogging = .T.

// Set the smart card PIN, which will be needed for signing.
loCert.SmartCardPin = "12345678"

// There are many ways to load the certificate.  
// This example was created for a customer using an ePass2003 USB token.
// Assuming the USB token is the only source of a hardware-based private key..
llSuccess = loCert.LoadFromSmartcard("")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCrypt
    release loCert
    return
endif

// Tell the crypt class to use this cert.
llSuccess = loCrypt.SetSigningCert(loCert)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
endif

loCmsOptions = createobject("CkJsonObject")
// Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
loCmsOptions.UpdateBool("DigestData",.T.)
loCmsOptions.UpdateBool("OmitAlgorithmIdNull",.T.)

// Indicate that we are passing normal JSON and we want Chilkat do automatically
// do the ITIDA JSON canonicalization:
loCmsOptions.UpdateBool("CanonicalizeITIDA",.T.)

loCrypt.CmsOptions = loCmsOptions.Emit()

// The CadesEnabled property applies to all methods that create CMS/PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true. 
loCrypt.CadesEnabled = .T.

loCrypt.HashAlgorithm = "sha256"

loJsonSigningAttrs = createobject("CkJsonObject")
loJsonSigningAttrs.UpdateInt("contentType",1)
loJsonSigningAttrs.UpdateInt("signingTime",1)
loJsonSigningAttrs.UpdateInt("messageDigest",1)
loJsonSigningAttrs.UpdateInt("signingCertificateV2",1)
loCrypt.SigningAttributes = loJsonSigningAttrs.Emit()

// By default, all the certs in the chain of authentication are included in the signature.
// If desired, we can choose to only include the signing certificate:
loCrypt.IncludeCertChain = .F.

// Pass a JSON document such as the following.  Chilkat will do the ITIDA canonicalization.
// (It is the canonicalized JSON that gets signed.)
// Note: The JSON should NOT begin with "{ "documents" : [ ..."

//       {
//          "issuer":{
//             "address":{
//                "branchID":"0",
//                "country":"EG",
//                "regionCity":"Cairo",
//                "postalCode":"",
//                "buildingNumber":"0",
//                "street":"123rd Street",
//                "governate":"GOVERNATE"
//             },
//             "type":"B",
//             "id":"209999899",
//             "name":"Xyz SAE"
//          },
//          "receiver":{
//             "address":{
//                "country":"EG",
//                "regionCity":"CAIRO",
//                "postalCode":"11435",
//                "buildingNumber":"0",
//                "street":"Autostrad Road Abc",
//                "governate":"GOVERNATE"
//             },
//             "type":"B",
//             "id":"999999999",
//             "name":"XYZ EGYPT FOR TRADE"
//          },
//          "documentType":"I",
//          "documentTypeVersion":"1.0",
//          "dateTimeIssued":"2020-11-15T11:04:53Z",
//          "taxpayerActivityCode":"1073",
//          "internalID":"ZZZZ999",
//          "purchaseOrderReference":"2009199918",
//          "salesOrderReference":"",
//          "payment":{
//             "bankName":"",
//             "bankAddress":"",
//             "bankAccountNo":"",
//             "bankAccountIBAN":"",
//             "swiftCode":"",
//             "terms":""
//          },
//          "delivery":{
//             "approach":"",
//             "packaging":"",
//             "dateValidity":"",
//             "exportPort":"",
//             "countryOfOrigin":"EG",
//             "grossWeight":0,
//             "netWeight":0,
//             "terms":""
//          },
//          "invoiceLines":[
//             {
//                "description":"CDM Widget 48GX99X12BA",
//                "itemType":"GS1",
//                "itemCode":"7622213335056",
//                "unitType":"CS",
//                "quantity":1.00,
//                "unitValue":{
//                   "currencySold":"EGP",
//                   "amountEGP":588.67,
//                   "amountSold":0,
//                   "currencyExchangeRate":0
//                },
//                "salesTotal":588.67,
//                "total":603.97,
//                "valueDifference":0,
//                "totalTaxableFees":0,
//                "netTotal":529.8,
//                "itemsDiscount":0,
//                "discount":{
//                   "rate":10.00,
//                   "amount":58.87
//                },
//                "taxableItems":[
//                   {
//                      "taxType":"T1",
//                      "amount":74.17,
//                      "subType":"No sub",
//                      "rate":14.00
//                   }
//                ],
//                "internalCode":"9099994"
//             }
//          ],
//          "totalSales":588.67,
//          "totalSalesAmount":588.67,
//          "totalDiscountAmount":58.87,
//          "netAmount":529.80,
//          "taxTotals":[
//             {
//                "taxType":"T1",
//                "amount":74.17
//             }
//          ],
//          "extraDiscountAmount":0,
//          "totalItemsDiscountAmount":0,
//          "totalAmount":603.97,
//       }

// Create the CAdES-BES signature.
loCrypt.EncodingMode = "base64"

// Make sure we sign the utf-8 byte representation of the JSON string
loCrypt.Charset = "utf-8"

lcJsonInvoice = "{ ... }"
lcSigBase64 = loCrypt.SignStringENC(lcJsonInvoice)
if (loCrypt.LastMethodSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    release loCmsOptions
    release loJsonSigningAttrs
    return
endif

? "Base64 signature:"
? lcSigBase64

// Insert the base64 signature into the JSON to be sent
loJson = createobject("CkJsonObject")
loJson.Load(lcJsonInvoice)
loJson.UpdateString("signatures[0].signatureType","I")
loJson.UpdateString("signatures[0].value",lcSigBase64)
loJson.EmitCompact = .T.

// Wrap the JSON in  {"documents":[ ... ]}
loSbToSend = createobject("CkStringBuilder")
loSbToSend.Append('{"documents":[')
loSbToSend.Append(loJson.Emit())
loSbToSend.Append("]}")

// ------------------------------------------------------------------------
// Get an access token using our client ID and client secret key
lcClientId = "abc999ff-1234"
lcClientSecretKey = "123fff22-1234-abcd"

loHttp = createobject("CkHttp")

// Causes the Authorization: Basic header to be added..
loHttp.Login = lcClientId
loHttp.Password = lcClientSecretKey
loHttp.BasicAuth = .T.

loReq = createobject("CkHttpRequest")
loReq.HttpVerb = "POST"
loReq.Path = "/connect/token"
loReq.ContentType = "application/x-www-form-urlencoded"
loReq.AddParam("grant_type","client_credentials")
loReq.AddHeader("Connection","close")

loHttp.Accept = "application/json"

loResp = loHttp.PostUrlEncoded("https://id.preprod.eta.gov.eg/connect/token",loReq)
if (loHttp.LastMethodSuccess = .F.) then
    ? loHttp.LastErrorText
    release loCrypt
    release loCert
    release loCmsOptions
    release loJsonSigningAttrs
    release loJson
    release loSbToSend
    release loHttp
    release loReq
    return
endif

loHttp.CloseAllConnections()

? "Response status code: " + str(loResp.StatusCode)
? "Response body:"
? loResp.BodyStr

if (loResp.StatusCode <> 200) then
    ? "Failed."
    release loResp
    release loCrypt
    release loCert
    release loCmsOptions
    release loJsonSigningAttrs
    release loJson
    release loSbToSend
    release loHttp
    release loReq
    return
endif

loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.Load(loResp.BodyStr)

lcAccessToken = loJsonToken.StringOf("access_token")
? "access_token = " + lcAccessToken

release loResp

// ------------------------------------------------------------------------
// Submit the signed JSON to the ETA (Egypt Tax Authority) Portal

// No longer sending basic authentication...
loHttp.Login = ""
loHttp.Password = ""
loHttp.BasicAuth = .F.

// Setting the AuthToken property causes the "Authorization: Bearer <token>" header to be added to each request.
loHttp.AuthToken = lcAccessToken

loResp = loHttp.PostJson2("https://api.preprod.invoicing.eta.gov.eg/api/v1/documentsubmissions","application/json; charset=utf-8",loSbToSend.GetAsString())
if (loHttp.LastMethodSuccess = .F.) then
    ? loHttp.LastErrorText
    release loCrypt
    release loCert
    release loCmsOptions
    release loJsonSigningAttrs
    release loJson
    release loSbToSend
    release loHttp
    release loReq
    release loJsonToken
    return
endif

? "Response status code: " + str(loResp.StatusCode)
? "Response body:"
? loResp.BodyStr


release loCrypt
release loCert
release loCmsOptions
release loJsonSigningAttrs
release loJson
release loSbToSend
release loHttp
release loReq
release loJsonToken