(C#) Hungary NAV Token Exchange

Demonstrates the tokenExchange request for the Hungarian NAV Online Invoicing System REST API v2.0.

Note: This example requires Chilkat v9.5.0.83 or greater.

For more information, see https://onlineszamla.nav.gov.hu/api/files/container/download/Online%20Szamla_Interfesz%20specifik%C3%A1ci%C3%B3_EN_v2.0.pdf

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

// Build the following XML:

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

// <?xml version="1.0" encoding="UTF-8"?>
// <TokenExchangeRequest xmlns="http://schemas.nav.gov.hu/OSA/2.0/api">
// 	<header>
// 		<requestId>RID896801578348</requestId>
// 		<timestamp>2019-09-11T10:55:31.440Z</timestamp>
// 		<requestVersion>2.0</requestVersion>
// 		<headerVersion>1.0</headerVersion>
// 	</header>
// 	<user>
// 		<login>lwilsmn0uqdxe6u</login>
// 		<passwordHash>2F43840A882CFDB7DB0FEC07D419D030D864B47B6B541DC280EF81B937B7A176E33C052B0D26638CC18A7A2C08D8D311733078A774BF43F6CA57FE8CD74DC28E</passwordHash>
// 		<taxNumber>11111111</taxNumber>
// 		<requestSignature>B4B5E0F197BFFD3DF69BCC98D3BE775F65FD5445EEF95C9D6B6C59425F2B81C4F6DA1FD563B0C7E7D98AF1E1725E5C63C2803B5D3A93D1C02ED354AC92F2CC94</requestSignature>
// 		<!--<signKey>ac-ac3a-7f661bff7d342N43CYX4U9FG</signKey>-->
// 	</user>
// 	<software>
// 		<softwareId>123456789123456789</softwareId>
// 		<softwareName>string</softwareName>
// 		<softwareOperation>LOCAL_SOFTWARE</softwareOperation>
// 		<softwareMainVersion>string</softwareMainVersion>
// 		<softwareDevName>string</softwareDevName>
// 		<softwareDevContact>string</softwareDevContact>
// 		<softwareDevCountryCode>HU</softwareDevCountryCode>
// 		<softwareDevTaxNumber>string</softwareDevTaxNumber>
// 	</software>
// </TokenExchangeRequest>

bool success;
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

Chilkat.CkDateTime dtNow = new Chilkat.CkDateTime();
dtNow.SetFromCurrentSystemTime();
Debug.WriteLine(dtNow.GetAsTimestamp(false));

// The hash algorithm for the password is SHA512 (not SHA3-512).
crypt.HashAlgorithm = "sha512";
crypt.EncodingMode = "hex";
string myPassword = "my-password";
string passwordHash = crypt.HashStringENC(myPassword);

// Generate a random request ID like "RID215118906689"
Chilkat.Prng prng = new Chilkat.Prng();
Chilkat.StringBuilder sbRequestId = new Chilkat.StringBuilder();
sbRequestId.Append("RID");
sbRequestId.Append(prng.RandomString(12,true,false,false));
Debug.WriteLine("generated requestId = " + sbRequestId.GetAsString());

// Calculate the requestSignature
crypt.HashAlgorithm = "sha3-512";
string signatureKey = "ce-8f5e-215119fa7dd621DLMRHRLH2S";

Chilkat.StringBuilder sbFinalHashBase = new Chilkat.StringBuilder();

// First append the timestamp because we are going to remove certain chars/parts.
sbFinalHashBase.Append(dtNow.GetAsTimestamp(false));
int numReplaced = sbFinalHashBase.Replace("Z","");
numReplaced = sbFinalHashBase.Replace("-","");
numReplaced = sbFinalHashBase.Replace(":","");
numReplaced = sbFinalHashBase.Replace("T","");

// Prepend the requestId and append the signatureKey
sbFinalHashBase.Prepend(sbRequestId.GetAsString());
sbFinalHashBase.Append(signatureKey);

string requestSignature = crypt.HashStringENC(sbFinalHashBase.GetAsString());

Chilkat.Xml xml = new Chilkat.Xml();
xml.Tag = "TokenExchangeRequest";
xml.AddAttribute("xmlns","http://schemas.nav.gov.hu/OSA/2.0/api");
xml.UpdateChildContent("header|requestId",sbRequestId.GetAsString());
xml.UpdateChildContent("header|timestamp",dtNow.GetAsTimestamp(false));
xml.UpdateChildContent("header|requestVersion","2.0");
xml.UpdateChildContent("header|headerVersion","1.0");
xml.UpdateChildContent("user|login","lwilsmn0uqdxe6u");
xml.UpdateChildContent("user|passwordHash",passwordHash);
xml.UpdateChildContent("user|taxNumber","11111111");
xml.UpdateChildContent("user|requestSignature",requestSignature);
xml.UpdateChildContent("software|softwareId","123456789123456789");
xml.UpdateChildContent("software|softwareName","string");
xml.UpdateChildContent("software|softwareOperation","LOCAL_SOFTWARE");
xml.UpdateChildContent("software|softwareMainVersion","string");
xml.UpdateChildContent("software|softwareDevName","string");
xml.UpdateChildContent("software|softwareDevContact","string");
xml.UpdateChildContent("software|softwareDevCountryCode","HU");
xml.UpdateChildContent("software|softwareDevTaxNumber","string");

// POST the XML to https://api-test.onlineszamla.nav.gov.hu/invoiceService/v2/tokenExchange
Chilkat.Http http = new Chilkat.Http();
http.Accept = "application/xml";
http.SetRequestHeader("Content-Type","application/xml");
string endpoint = "https://api-test.onlineszamla.nav.gov.hu/invoiceService/v2/tokenExchange";
Chilkat.HttpResponse resp = http.PostXml(endpoint,xml.GetXml(),"utf-8");
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("Response status code = " + Convert.ToString(resp.StatusCode));

Chilkat.Xml respXml = new Chilkat.Xml();
respXml.LoadXml(resp.BodyStr);
Debug.WriteLine("Response body:");
Debug.WriteLine(respXml.GetXml());

// Save our exchange token to a file to be used for subsequent requests.
respXml.SaveXml("qa_data/tokens/nav_exchange_token.xml");

// The result looks like this:

// <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
// <TokenExchangeResponse xmlns="http://schemas.nav.gov.hu/OSA/2.0/api" xmlns:ns2="http://schemas.nav.gov.hu/OSA/2.0/data">
//     <header>
//         <requestId>RID789246611489</requestId>
//         <timestamp>2020-03-25T14:14:36Z</timestamp>
//         <requestVersion>2.0</requestVersion>
//         <headerVersion>1.0</headerVersion>
//     </header>
//     <result>
//         <funcCode>OK</funcCode>
//     </result>
//     <software>
//         <softwareId>123456789123456789</softwareId>
//         <softwareName>string</softwareName>
//         <softwareOperation>LOCAL_SOFTWARE</softwareOperation>
//         <softwareMainVersion>string</softwareMainVersion>
//         <softwareDevName>string</softwareDevName>
//         <softwareDevContact>string</softwareDevContact>
//         <softwareDevCountryCode>HU</softwareDevCountryCode>
//         <softwareDevTaxNumber>string</softwareDevTaxNumber>
//     </software>
//     <encodedExchangeToken>2lR5v57Tl ... 9n4tIWCYgjKQ==</encodedExchangeToken>
//     <tokenValidityFrom>2020-03-25T15:14:36.987+01:00</tokenValidityFrom>
//     <tokenValidityTo>2020-03-25T15:19:36.987+01:00</tokenValidityTo>
// </TokenExchangeResponse>

// Use this online tool to generate parsing code from sample XML: 
// Generate Parsing Code from XML

string TokenExchangeResponse_xmlns = respXml.GetAttrValue("xmlns");
string TokenExchangeResponse_xmlns_ns2 = respXml.GetAttrValue("xmlns:ns2");
string requestId = respXml.GetChildContent("header|requestId");
string timestamp = respXml.GetChildContent("header|timestamp");
string requestVersion = respXml.GetChildContent("header|requestVersion");
string headerVersion = respXml.GetChildContent("header|headerVersion");
string funcCode = respXml.GetChildContent("result|funcCode");
string softwareId = respXml.GetChildContent("software|softwareId");
string softwareName = respXml.GetChildContent("software|softwareName");
string softwareOperation = respXml.GetChildContent("software|softwareOperation");
string softwareMainVersion = respXml.GetChildContent("software|softwareMainVersion");
string softwareDevName = respXml.GetChildContent("software|softwareDevName");
string softwareDevContact = respXml.GetChildContent("software|softwareDevContact");
string softwareDevCountryCode = respXml.GetChildContent("software|softwareDevCountryCode");
string softwareDevTaxNumber = respXml.GetChildContent("software|softwareDevTaxNumber");
string encodedExchangeToken = respXml.GetChildContent("encodedExchangeToken");
string tokenValidityFrom = respXml.GetChildContent("tokenValidityFrom");
string tokenValidityTo = respXml.GetChildContent("tokenValidityTo");