(Delphi DLL) 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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, HttpRequest, HttpResponse, StringBuilder, JsonObject, Cert, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
crypt: HCkCrypt2;
cert: HCkCert;
cmsOptions: HCkJsonObject;
jsonSigningAttrs: HCkJsonObject;
jsonInvoice: PWideChar;
sigBase64: PWideChar;
json: HCkJsonObject;
sbToSend: HCkStringBuilder;
clientId: PWideChar;
clientSecretKey: PWideChar;
http: HCkHttp;
req: HCkHttpRequest;
resp: HCkHttpResponse;
jsonToken: HCkJsonObject;
accessToken: PWideChar;
url: PWideChar;
jsonStr: PWideChar;

begin
success := False;

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

crypt := CkCrypt2_Create();
CkCrypt2_putVerboseLogging(crypt,True);

cert := CkCert_Create();
CkCert_putVerboseLogging(cert,True);

// Set the smart card PIN, which will be needed for signing.
CkCert_putSmartCardPin(cert,'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 := CkCert_LoadFromSmartcard(cert,'');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

// Tell the crypt class to use this cert.
success := CkCrypt2_SetSigningCert(crypt,cert);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

cmsOptions := CkJsonObject_Create();
// Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
CkJsonObject_UpdateBool(cmsOptions,'DigestData',True);
CkJsonObject_UpdateBool(cmsOptions,'OmitAlgorithmIdNull',True);

// Indicate that we are passing normal JSON and we want Chilkat do automatically
// do the ITIDA JSON canonicalization:
CkJsonObject_UpdateBool(cmsOptions,'CanonicalizeITIDA',True);

CkCrypt2_putCmsOptions(crypt,CkJsonObject__emit(cmsOptions));

// The CadesEnabled property applies to all methods that create CMS/PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true. 
CkCrypt2_putCadesEnabled(crypt,True);

CkCrypt2_putHashAlgorithm(crypt,'sha256');

jsonSigningAttrs := CkJsonObject_Create();
CkJsonObject_UpdateInt(jsonSigningAttrs,'contentType',1);
CkJsonObject_UpdateInt(jsonSigningAttrs,'signingTime',1);
CkJsonObject_UpdateInt(jsonSigningAttrs,'messageDigest',1);
CkJsonObject_UpdateInt(jsonSigningAttrs,'signingCertificateV2',1);
CkCrypt2_putSigningAttributes(crypt,CkJsonObject__emit(jsonSigningAttrs));

// 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:
CkCrypt2_putIncludeCertChain(crypt,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.
CkCrypt2_putEncodingMode(crypt,'base64');

// Make sure we sign the utf-8 byte representation of the JSON string
CkCrypt2_putCharset(crypt,'utf-8');

jsonInvoice := '{ ... }';
sigBase64 := CkCrypt2__signStringENC(crypt,jsonInvoice);
if (CkCrypt2_getLastMethodSuccess(crypt) = False) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

Memo1.Lines.Add('Base64 signature:');
Memo1.Lines.Add(sigBase64);

// Insert the base64 signature into the JSON to be sent
json := CkJsonObject_Create();
CkJsonObject_Load(json,jsonInvoice);
CkJsonObject_UpdateString(json,'signatures[0].signatureType','I');
CkJsonObject_UpdateString(json,'signatures[0].value',sigBase64);
CkJsonObject_putEmitCompact(json,True);

// Wrap the JSON in  {"documents":[ ... ]}
sbToSend := CkStringBuilder_Create();
CkStringBuilder_Append(sbToSend,'{"documents":[');
CkStringBuilder_Append(sbToSend,CkJsonObject__emit(json));
CkStringBuilder_Append(sbToSend,']}');

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

http := CkHttp_Create();

// Causes the Authorization: Basic header to be added..
CkHttp_putLogin(http,clientId);
CkHttp_putPassword(http,clientSecretKey);
CkHttp_putBasicAuth(http,True);

req := CkHttpRequest_Create();
CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putPath(req,'/connect/token');
CkHttpRequest_putContentType(req,'application/x-www-form-urlencoded');
CkHttpRequest_AddParam(req,'grant_type','client_credentials');
CkHttpRequest_AddHeader(req,'Connection','close');

CkHttp_putAccept(http,'application/json');

resp := CkHttpResponse_Create();
success := CkHttp_HttpReq(http,'https://id.preprod.eta.gov.eg/connect/token',req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

CkHttp_CloseAllConnections(http);

Memo1.Lines.Add('Response status code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
Memo1.Lines.Add('Response body:');
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));

if (CkHttpResponse_getStatusCode(resp) <> 200) then
  begin
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

jsonToken := CkJsonObject_Create();
success := CkJsonObject_Load(jsonToken,CkHttpResponse__bodyStr(resp));

accessToken := CkJsonObject__stringOf(jsonToken,'access_token');
Memo1.Lines.Add('access_token = ' + accessToken);

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

// No longer sending basic authentication...
CkHttp_putLogin(http,'');
CkHttp_putPassword(http,'');
CkHttp_putBasicAuth(http,False);

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

url := 'https://api.preprod.invoicing.eta.gov.eg/api/v1/documentsubmissions';
jsonStr := CkStringBuilder__getAsString(sbToSend);

success := CkHttp_HttpStr(http,'POST',url,jsonStr,'utf-8','application/json; charset=utf-8',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('Response status code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
Memo1.Lines.Add('Response body:');
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));

CkCrypt2_Dispose(crypt);
CkCert_Dispose(cert);
CkJsonObject_Dispose(cmsOptions);
CkJsonObject_Dispose(jsonSigningAttrs);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbToSend);
CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);
CkHttpResponse_Dispose(resp);
CkJsonObject_Dispose(jsonToken);

end;