(Objective-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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#import <CkoCrypt2.h>
#import <CkoDateTime.h>
#import <NSString.h>
#import <CkoPrng.h>
#import <CkoStringBuilder.h>
#import <CkoXml.h>
#import <CkoHttp.h>
#import <CkoHttpResponse.h>

// 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;
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];

CkoDateTime *dtNow = [[CkoDateTime alloc] init];
[dtNow SetFromCurrentSystemTime];
NSLog(@"%@",[dtNow GetAsTimestamp: NO]);

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

// Generate a random request ID like "RID215118906689"
CkoPrng *prng = [[CkoPrng alloc] init];
CkoStringBuilder *sbRequestId = [[CkoStringBuilder alloc] init];
[sbRequestId Append: @"RID"];
[sbRequestId Append: [prng RandomString: [NSNumber numberWithInt: 12] bDigits: YES bLower: NO bUpper: NO]];
NSLog(@"%@%@",@"generated requestId = ",[sbRequestId GetAsString]);

// IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
// IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
// IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
// IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
// IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
// Calculate the requestSignature
crypt.HashAlgorithm = @"sha3-512";
NSString *signatureKey = @"ce-8f5e-215119fa7dd621DLMRHRLH2S";

CkoStringBuilder *sbFinalHashBase = [[CkoStringBuilder alloc] init];

// First append the timestamp because we are going to remove certain chars/parts.
[sbFinalHashBase Append: [dtNow GetAsTimestamp: NO]];
int numReplaced = [[sbFinalHashBase Replace: @"Z" replacement: @""] intValue];
numReplaced = [[sbFinalHashBase Replace: @"-" replacement: @""] intValue];
numReplaced = [[sbFinalHashBase Replace: @":" replacement: @""] intValue];
numReplaced = [[sbFinalHashBase Replace: @"T" replacement: @""] intValue];

// Prepend the requestId and append the signatureKey
[sbFinalHashBase Prepend: [sbRequestId GetAsString]];
[sbFinalHashBase Append: signatureKey];

NSString *requestSignature = [crypt HashStringENC: [sbFinalHashBase GetAsString]];

CkoXml *xml = [[CkoXml alloc] init];
xml.Tag = @"TokenExchangeRequest";
[xml AddAttribute: @"xmlns" value: @"http://schemas.nav.gov.hu/OSA/2.0/api"];
[xml UpdateChildContent: @"header|requestId" value: [sbRequestId GetAsString]];
[xml UpdateChildContent: @"header|timestamp" value: [dtNow GetAsTimestamp: NO]];
[xml UpdateChildContent: @"header|requestVersion" value: @"2.0"];
[xml UpdateChildContent: @"header|headerVersion" value: @"1.0"];
[xml UpdateChildContent: @"user|login" value: @"lwilsmn0uqdxe6u"];
[xml UpdateChildContent: @"user|passwordHash" value: passwordHash];
[xml UpdateChildContent: @"user|taxNumber" value: @"11111111"];
[xml UpdateChildContent: @"user|requestSignature" value: requestSignature];
[xml UpdateChildContent: @"software|softwareId" value: @"123456789123456789"];
[xml UpdateChildContent: @"software|softwareName" value: @"string"];
[xml UpdateChildContent: @"software|softwareOperation" value: @"LOCAL_SOFTWARE"];
[xml UpdateChildContent: @"software|softwareMainVersion" value: @"string"];
[xml UpdateChildContent: @"software|softwareDevName" value: @"string"];
[xml UpdateChildContent: @"software|softwareDevContact" value: @"string"];
[xml UpdateChildContent: @"software|softwareDevCountryCode" value: @"HU"];
[xml UpdateChildContent: @"software|softwareDevTaxNumber" value: @"string"];

// POST the XML to https://api-test.onlineszamla.nav.gov.hu/invoiceService/v2/tokenExchange
CkoHttp *http = [[CkoHttp alloc] init];
http.Accept = @"application/xml";
[http SetRequestHeader: @"Content-Type" value: @"application/xml"];
NSString *endpoint = @"https://api-test.onlineszamla.nav.gov.hu/invoiceService/v2/tokenExchange";
CkoHttpResponse *resp = [http PostXml: endpoint xmlDoc: [xml GetXml] charset: @"utf-8"];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response status code = ",[resp.StatusCode intValue]);

CkoXml *respXml = [[CkoXml alloc] init];
[respXml LoadXml: resp.BodyStr];
NSLog(@"%@",@"Response body:");
NSLog(@"%@",[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

NSString *TokenExchangeResponse_xmlns = [respXml GetAttrValue: @"xmlns"];
NSString *TokenExchangeResponse_xmlns_ns2 = [respXml GetAttrValue: @"xmlns:ns2"];
NSString *requestId = [respXml GetChildContent: @"header|requestId"];
NSString *timestamp = [respXml GetChildContent: @"header|timestamp"];
NSString *requestVersion = [respXml GetChildContent: @"header|requestVersion"];
NSString *headerVersion = [respXml GetChildContent: @"header|headerVersion"];
NSString *funcCode = [respXml GetChildContent: @"result|funcCode"];
NSString *softwareId = [respXml GetChildContent: @"software|softwareId"];
NSString *softwareName = [respXml GetChildContent: @"software|softwareName"];
NSString *softwareOperation = [respXml GetChildContent: @"software|softwareOperation"];
NSString *softwareMainVersion = [respXml GetChildContent: @"software|softwareMainVersion"];
NSString *softwareDevName = [respXml GetChildContent: @"software|softwareDevName"];
NSString *softwareDevContact = [respXml GetChildContent: @"software|softwareDevContact"];
NSString *softwareDevCountryCode = [respXml GetChildContent: @"software|softwareDevCountryCode"];
NSString *softwareDevTaxNumber = [respXml GetChildContent: @"software|softwareDevTaxNumber"];
NSString *encodedExchangeToken = [respXml GetChildContent: @"encodedExchangeToken"];
NSString *tokenValidityFrom = [respXml GetChildContent: @"tokenValidityFrom"];
NSString *tokenValidityTo = [respXml GetChildContent: @"tokenValidityTo"];