(Go) Create ITIDA Signed JSON and Send to ETA (Egypt Tax Authority) Portal

See more Egypt ITIDA Examples

Demonstrates how to create a .p7s signature that fits Egypt's ITIDA requirements where Chilkat automatically does the ITIDA JSON canonicalization. Also shows the code to send to the ETA Portal.

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

    // Indicate that utf-8 is desired for strings passed in and out of Chilkat.
    glob := chilkat.NewGlobal()
    glob.SetDefaultUtf8(true)

    crypt := chilkat.NewCrypt2()
    crypt.SetVerboseLogging(true)

    cert := chilkat.NewCert()
    cert.SetVerboseLogging(true)

    // Set the smart card PIN, which will be needed for signing.
    cert.SetSmartCardPin("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..
    success := cert.LoadFromSmartcard("")
    if success != true {
        fmt.Println(cert.LastErrorText())
        glob.DisposeGlobal()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    // Tell the crypt class to use this cert.
    success = crypt.SetSigningCert(cert)
    if success != true {
        fmt.Println(crypt.LastErrorText())
        glob.DisposeGlobal()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    cmsOptions := chilkat.NewJsonObject()
    // Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
    cmsOptions.UpdateBool("DigestData",true)
    cmsOptions.UpdateBool("OmitAlgorithmIdNull",true)

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

    crypt.SetCmsOptions(*cmsOptions.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. 
    crypt.SetCadesEnabled(true)

    crypt.SetHashAlgorithm("sha256")

    jsonSigningAttrs := chilkat.NewJsonObject()
    jsonSigningAttrs.UpdateInt("contentType",1)
    jsonSigningAttrs.UpdateInt("signingTime",1)
    jsonSigningAttrs.UpdateInt("messageDigest",1)
    jsonSigningAttrs.UpdateInt("signingCertificateV2",1)
    crypt.SetSigningAttributes(*jsonSigningAttrs.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:
    crypt.SetIncludeCertChain(false)

    // Pass a JSON document such as the following.  Chilkat will do the ITIDA canonicalization.
    // (It is the canonicalized JSON that gets signed.)

    //       {
    //          "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,
    //       }

    // Build the above JSON..

    // Use this online tool to generate code from sample JSON: 
    // Generate Code to Create JSON

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

    json.SetEmitCompact(true)
    jsonToSign := json.Emit()

    // Create the CAdES-BES signature.
    crypt.SetEncodingMode("base64")

    // Make sure we sign the utf-8 byte representation of the JSON string
    crypt.SetCharset("utf-8")

    sigBase64 := crypt.SignStringENC(*jsonToSign)
    if crypt.LastMethodSuccess() == false {
        fmt.Println(crypt.LastErrorText())
        glob.DisposeGlobal()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        cmsOptions.DisposeJsonObject()
        jsonSigningAttrs.DisposeJsonObject()
        json.DisposeJsonObject()
        return
    }

    fmt.Println("Base64 signature:")
    fmt.Println(*sigBase64)

    // Insert the base64 signature into the JSON to be sent
    json.UpdateString("signatures[0].signatureType","I")
    json.UpdateString("signatures[0].value",*sigBase64)

    // Wrap the JSON in  {"documents":[ ... ]}
    sbToSend := chilkat.NewStringBuilder()
    sbToSend.Append("{\"documents\":[")
    sbToSend.Append(*json.Emit())
    sbToSend.Append("]}")

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

    http := chilkat.NewHttp()

    // Causes the Authorization: Basic header to be added..
    http.SetLogin(clientId)
    http.SetPassword(clientSecretKey)
    http.SetBasicAuth(true)

    req := chilkat.NewHttpRequest()
    req.SetHttpVerb("POST")
    req.SetPath("/connect/token")
    req.SetContentType("application/x-www-form-urlencoded")
    req.AddParam("grant_type","client_credentials")
    req.AddHeader("Connection","close")

    http.SetAccept("application/json")

    resp := http.PostUrlEncoded("https://id.preprod.eta.gov.eg/connect/token",req)
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        glob.DisposeGlobal()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        cmsOptions.DisposeJsonObject()
        jsonSigningAttrs.DisposeJsonObject()
        json.DisposeJsonObject()
        sbToSend.DisposeStringBuilder()
        http.DisposeHttp()
        req.DisposeHttpRequest()
        return
    }

    http.CloseAllConnections()

    fmt.Println("Response status code: ", resp.StatusCode())
    fmt.Println("Response body:")
    fmt.Println(resp.BodyStr())

    if resp.StatusCode() != 200 {
        fmt.Println("Failed.")
        resp.DisposeHttpResponse()
        glob.DisposeGlobal()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        cmsOptions.DisposeJsonObject()
        jsonSigningAttrs.DisposeJsonObject()
        json.DisposeJsonObject()
        sbToSend.DisposeStringBuilder()
        http.DisposeHttp()
        req.DisposeHttpRequest()
        return
    }

    jsonToken := chilkat.NewJsonObject()
    success = jsonToken.Load(resp.BodyStr())

    accessToken := jsonToken.StringOf("access_token")
    fmt.Println("access_token = ", *accessToken)

    resp.DisposeHttpResponse()

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

    // No longer sending basic authentication...
    http.SetLogin("")
    http.SetPassword("")
    http.SetBasicAuth(false)

    // Setting the AuthToken property causes the "Authorization: Bearer <token>" header to be added to each request.
    http.SetAuthToken(*accessToken)

    resp = http.PostJson2("https://api.preprod.invoicing.eta.gov.eg/api/v1/documentsubmissions","application/json; charset=utf-8",*sbToSend.GetAsString())
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        glob.DisposeGlobal()
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        cmsOptions.DisposeJsonObject()
        jsonSigningAttrs.DisposeJsonObject()
        json.DisposeJsonObject()
        sbToSend.DisposeStringBuilder()
        http.DisposeHttp()
        req.DisposeHttpRequest()
        jsonToken.DisposeJsonObject()
        return
    }

    fmt.Println("Response status code: ", resp.StatusCode())
    fmt.Println("Response body:")
    fmt.Println(resp.BodyStr())

    glob.DisposeGlobal()
    crypt.DisposeCrypt2()
    cert.DisposeCert()
    cmsOptions.DisposeJsonObject()
    jsonSigningAttrs.DisposeJsonObject()
    json.DisposeJsonObject()
    sbToSend.DisposeStringBuilder()
    http.DisposeHttp()
    req.DisposeHttpRequest()
    jsonToken.DisposeJsonObject()