(Objective-C) hotelbeds.com REST API Authentication

Demonstrates how to calculate the X-Signature header and add to requests sent to api.test.hotelbeds.com.

For more information, see https://developer.hotelbeds.com/documentation/getting-started/

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#import <CkoDateTime.h>
#import <NSString.h>
#import <CkoStringBuilder.h>
#import <CkoCrypt2.h>
#import <CkoHttp.h>

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

// This example duplicates the following CURL statement provided in the hotelbeds.com "Getting Started"
// developer documentation:

// #!/bin/bash 
// apiKey="yourApiKey"
// secret="yourSecret"
// curl -i \
//   -X GET \
//   -H 'Accept:application/json' \
//   -H 'Api-key:'$apiKey'' \
//   -H 'X-Signature:'$(echo -n ${apiKey}${secret}$(date +%s)|sha256sum|awk '{ print $1}')'' \
//   https://api.test.hotelbeds.com/hotel-api/1.0/status

BOOL success;

// The "date + %s" command emits a UNIX date/time number such as 1605548842
// We need to concatenate the apiKey, secret, and current date/time in UNIX (numeric) time format.
CkoDateTime *dt = [[CkoDateTime alloc] init];
[dt SetFromCurrentSystemTime];
// Get the UNIX time string in the GMT timezone.
BOOL bLocalTime = NO;
NSString *unixTimeStr = [dt GetAsUnixTimeStr: bLocalTime];
NSLog(@"%@",unixTimeStr);

// Use your own API key and secret.  (These are not valid values)
NSString *apiKey = @"227b20a2cb705e45f3b0a0944672dc07";
NSString *secret = @"54dc7ba9e2";

CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];
[sb Append: apiKey];
[sb Append: secret];
[sb Append: unixTimeStr];

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.HashAlgorithm = @"sha256";
crypt.EncodingMode = @"hexlower";
NSString *signature = [crypt HashStringENC: [sb GetAsString]];

NSLog(@"%@",signature);

CkoHttp *http = [[CkoHttp alloc] init];

[http SetRequestHeader: @"Accept" value: @"application/json"];
[http SetRequestHeader: @"Api-key" value: apiKey];
[http SetRequestHeader: @"X-Signature" value: signature];

NSString *jsonResponse = [http QuickGetStr: @"https://api.test.hotelbeds.com/hotel-api/1.0/status"];
NSLog(@"%@",jsonResponse);
NSLog(@"%d",[http.LastStatus intValue]);

// Sample output:  

// 1605549542
// 2146aefb36e7331b3b29aafd7638398ca22e689573224f1a71274d60bd201ec2
// {"auditData":{"timestamp":"2020-11-16 18:59:02.430"},"status":"OK"}
// 200