(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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#include <C_CkCrypt2.h>
#include <C_CkDateTime.h>
#include <C_CkPrng.h>
#include <C_CkStringBuilder.h>
#include <C_CkXml.h>
#include <C_CkHttp.h>
#include <C_CkHttpResponse.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2 crypt;
    HCkDateTime dtNow;
    const char *myPassword;
    const char *passwordHash;
    HCkPrng prng;
    HCkStringBuilder sbRequestId;
    const char *signatureKey;
    HCkStringBuilder sbFinalHashBase;
    int numReplaced;
    const char *requestSignature;
    HCkXml xml;
    HCkHttp http;
    const char *endpoint;
    HCkHttpResponse resp;
    HCkXml respXml;
    const char *TokenExchangeResponse_xmlns;
    const char *TokenExchangeResponse_xmlns_ns2;
    const char *requestId;
    const char *timestamp;
    const char *requestVersion;
    const char *headerVersion;
    const char *funcCode;
    const char *softwareId;
    const char *softwareName;
    const char *softwareOperation;
    const char *softwareMainVersion;
    const char *softwareDevName;
    const char *softwareDevContact;
    const char *softwareDevCountryCode;
    const char *softwareDevTaxNumber;
    const char *encodedExchangeToken;
    const char *tokenValidityFrom;
    const char *tokenValidityTo;

    // 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>

    crypt = CkCrypt2_Create();

    dtNow = CkDateTime_Create();
    CkDateTime_SetFromCurrentSystemTime(dtNow);
    printf("%s\n",CkDateTime_getAsTimestamp(dtNow,FALSE));

    // The hash algorithm for the password is SHA512 (not SHA3-512).
    CkCrypt2_putHashAlgorithm(crypt,"sha512");
    CkCrypt2_putEncodingMode(crypt,"hex");
    myPassword = "my-password";
    passwordHash = CkCrypt2_hashStringENC(crypt,myPassword);

    // Generate a random request ID like "RID215118906689"
    prng = CkPrng_Create();
    sbRequestId = CkStringBuilder_Create();
    CkStringBuilder_Append(sbRequestId,"RID");
    CkStringBuilder_Append(sbRequestId,CkPrng_randomString(prng,12,TRUE,FALSE,FALSE));
    printf("generated requestId = %s\n",CkStringBuilder_getAsString(sbRequestId));

    // Calculate the requestSignature
    CkCrypt2_putHashAlgorithm(crypt,"sha3-512");
    signatureKey = "ce-8f5e-215119fa7dd621DLMRHRLH2S";

    sbFinalHashBase = CkStringBuilder_Create();

    // First append the timestamp because we are going to remove certain chars/parts.
    CkStringBuilder_Append(sbFinalHashBase,CkDateTime_getAsTimestamp(dtNow,FALSE));
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,"Z","");
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,"-","");
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,":","");
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,"T","");

    // Prepend the requestId and append the signatureKey
    CkStringBuilder_Prepend(sbFinalHashBase,CkStringBuilder_getAsString(sbRequestId));
    CkStringBuilder_Append(sbFinalHashBase,signatureKey);

    requestSignature = CkCrypt2_hashStringENC(crypt,CkStringBuilder_getAsString(sbFinalHashBase));

    xml = CkXml_Create();
    CkXml_putTag(xml,"TokenExchangeRequest");
    CkXml_AddAttribute(xml,"xmlns","http://schemas.nav.gov.hu/OSA/2.0/api");
    CkXml_UpdateChildContent(xml,"header|requestId",CkStringBuilder_getAsString(sbRequestId));
    CkXml_UpdateChildContent(xml,"header|timestamp",CkDateTime_getAsTimestamp(dtNow,FALSE));
    CkXml_UpdateChildContent(xml,"header|requestVersion","2.0");
    CkXml_UpdateChildContent(xml,"header|headerVersion","1.0");
    CkXml_UpdateChildContent(xml,"user|login","lwilsmn0uqdxe6u");
    CkXml_UpdateChildContent(xml,"user|passwordHash",passwordHash);
    CkXml_UpdateChildContent(xml,"user|taxNumber","11111111");
    CkXml_UpdateChildContent(xml,"user|requestSignature",requestSignature);
    CkXml_UpdateChildContent(xml,"software|softwareId","123456789123456789");
    CkXml_UpdateChildContent(xml,"software|softwareName","string");
    CkXml_UpdateChildContent(xml,"software|softwareOperation","LOCAL_SOFTWARE");
    CkXml_UpdateChildContent(xml,"software|softwareMainVersion","string");
    CkXml_UpdateChildContent(xml,"software|softwareDevName","string");
    CkXml_UpdateChildContent(xml,"software|softwareDevContact","string");
    CkXml_UpdateChildContent(xml,"software|softwareDevCountryCode","HU");
    CkXml_UpdateChildContent(xml,"software|softwareDevTaxNumber","string");

    // POST the XML to https://api-test.onlineszamla.nav.gov.hu/invoiceService/v2/tokenExchange
    http = CkHttp_Create();
    CkHttp_putAccept(http,"application/xml");
    CkHttp_SetRequestHeader(http,"Content-Type","application/xml");
    endpoint = "https://api-test.onlineszamla.nav.gov.hu/invoiceService/v2/tokenExchange";
    resp = CkHttp_PostXml(http,endpoint,CkXml_getXml(xml),"utf-8");
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkCrypt2_Dispose(crypt);
        CkDateTime_Dispose(dtNow);
        CkPrng_Dispose(prng);
        CkStringBuilder_Dispose(sbRequestId);
        CkStringBuilder_Dispose(sbFinalHashBase);
        CkXml_Dispose(xml);
        CkHttp_Dispose(http);
        return;
    }

    printf("Response status code = %d\n",CkHttpResponse_getStatusCode(resp));

    respXml = CkXml_Create();
    CkXml_LoadXml(respXml,CkHttpResponse_bodyStr(resp));
    printf("Response body:\n");
    printf("%s\n",CkXml_getXml(respXml));

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

    CkHttpResponse_Dispose(resp);

    // 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

    // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

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


    CkCrypt2_Dispose(crypt);
    CkDateTime_Dispose(dtNow);
    CkPrng_Dispose(prng);
    CkStringBuilder_Dispose(sbRequestId);
    CkStringBuilder_Dispose(sbFinalHashBase);
    CkXml_Dispose(xml);
    CkHttp_Dispose(http);
    CkXml_Dispose(respXml);

    }