(C++) 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.

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#include <CkCrypt2.h>
#include <CkCert.h>
#include <CkJsonObject.h>
#include <CkStringBuilder.h>
#include <CkHttp.h>
#include <CkHttpRequest.h>
#include <CkHttpResponse.h>

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

    CkCrypt2 crypt;
    crypt.put_VerboseLogging(true);

    CkCert cert;
    cert.put_VerboseLogging(true);

    // Set the smart card PIN, which will be needed for signing.
    cert.put_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..
    bool success = cert.LoadFromSmartcard("");
    if (success != true) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    // Tell the crypt class to use this cert.
    success = crypt.SetSigningCert(cert);
    if (success != true) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject cmsOptions;
    // 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.put_CmsOptions(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.put_CadesEnabled(true);

    crypt.put_HashAlgorithm("sha256");

    CkJsonObject jsonSigningAttrs;
    jsonSigningAttrs.UpdateInt("contentType",1);
    jsonSigningAttrs.UpdateInt("signingTime",1);
    jsonSigningAttrs.UpdateInt("messageDigest",1);
    jsonSigningAttrs.UpdateInt("signingCertificateV2",1);
    crypt.put_SigningAttributes(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.put_IncludeCertChain(false);

    // 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.
    crypt.put_EncodingMode("base64");

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

    const char *jsonInvoice = "{ ... }";
    const char *sigBase64 = crypt.signStringENC(jsonInvoice);
    if (crypt.get_LastMethodSuccess() == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Base64 signature:" << "\r\n";
    std::cout << sigBase64 << "\r\n";

    // Insert the base64 signature into the JSON to be sent
    CkJsonObject json;
    json.Load(jsonInvoice);
    json.UpdateString("signatures[0].signatureType","I");
    json.UpdateString("signatures[0].value",sigBase64);
    json.put_EmitCompact(true);

    // Wrap the JSON in  {"documents":[ ... ]}
    CkStringBuilder sbToSend;
    sbToSend.Append("{\"documents\":[");
    sbToSend.Append(json.emit());
    sbToSend.Append("]}");

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

    CkHttp http;

    // Causes the Authorization: Basic header to be added..
    http.put_Login(clientId);
    http.put_Password(clientSecretKey);
    http.put_BasicAuth(true);

    CkHttpRequest req;
    req.put_HttpVerb("POST");
    req.put_Path("/connect/token");
    req.put_ContentType("application/x-www-form-urlencoded");
    req.AddParam("grant_type","client_credentials");
    req.AddHeader("Connection","close");

    http.put_Accept("application/json");

    CkHttpResponse *resp = http.PostUrlEncoded("https://id.preprod.eta.gov.eg/connect/token",req);
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    http.CloseAllConnections();

    std::cout << "Response status code: " << resp->get_StatusCode() << "\r\n";
    std::cout << "Response body:" << "\r\n";
    std::cout << resp->bodyStr() << "\r\n";

    if (resp->get_StatusCode() != 200) {
        std::cout << "Failed." << "\r\n";
        delete resp;
        return;
    }

    CkJsonObject jsonToken;
    success = jsonToken.Load(resp->bodyStr());

    const char *accessToken = jsonToken.stringOf("access_token");
    std::cout << "access_token = " << accessToken << "\r\n";

    delete resp;

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

    // No longer sending basic authentication...
    http.put_Login("");
    http.put_Password("");
    http.put_BasicAuth(false);

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

    resp = http.PostJson2("https://api.preprod.invoicing.eta.gov.eg/api/v1/documentsubmissions","application/json; charset=utf-8",sbToSend.getAsString());
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Response status code: " << resp->get_StatusCode() << "\r\n";
    std::cout << "Response body:" << "\r\n";
    std::cout << resp->bodyStr() << "\r\n";
    }