(Objective-C) ShippingEasy.com Calculate Signature for API Authentication

Demonstrates how to calculate the shippingeasy.com API signature for authenticating requests.

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

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

// 
// First, concatenate these into a plaintext string using the following order:
// 
//     Capitilized method of the request. E.g. "POST"
//     The URI path
//     The query parameters sorted alphabetically and concatenated together into a URL friendly format: param1=ABC&param2=XYZ
//     The request body as a string if one exists
//     All parts are then concatenated together with an ampersand. The result resembles something like this:
// 
// "POST&/partners/api/accounts&api_key=f9a7c8ebdfd34beaf260d9b0296c7059&api_timestamp=1401803554&{ ... request body ... }"

BOOL success;
CkoStringBuilder *sbStringToSign = [[CkoStringBuilder alloc] init];

NSString *httpVerb = @"POST";
NSString *uriPath = @"/partners/api/accounts";
NSString *queryParamsStr = @"api_key=YOUR_API_KEY&api_timestamp=UNIX_EPOCH_TIMESTAMP";

// Build the following JSON that will be the body of the request:

// {
//   "account": {
//     "first_name": "Coralie",
//     "last_name": "Waelchi",
//     "company_name": "Hegmann, Cremin and Bradtke",
//     "email": "se_greg_6d477b1e59e8ff24abadfb59d3a2de3e@shippingeasy.com",
//     "phone_number": "1-381-014-3358",
//     "address": "2476 Flo Inlet",
//     "address2": "",
//     "state": "SC",
//     "city": "North Dennis",
//     "postal_code": "29805",
//     "country": "USA",
//     "password": "abc123",
//     "subscription_plan_code": "starter"
//   }
// }

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"account.first_name" value: @"Coralie"];
[json UpdateString: @"account.last_name" value: @"Waelchi"];
[json UpdateString: @"account.company_name" value: @"Hegmann, Cremin and Bradtke"];
[json UpdateString: @"account.email" value: @"se_greg_6d477b1e59e8ff24abadfb59d3a2de3e@shippingeasy.com"];
[json UpdateString: @"account.phone_number" value: @"1-381-014-3358"];
[json UpdateString: @"account.address" value: @"2476 Flo Inlet"];
[json UpdateString: @"account.address2" value: @""];
[json UpdateString: @"account.state" value: @"SC"];
[json UpdateString: @"account.city" value: @"North Dennis"];
[json UpdateString: @"account.postal_code" value: @"29805"];
[json UpdateString: @"account.country" value: @"USA"];
[json UpdateString: @"account.password" value: @"abc123"];
[json UpdateString: @"account.subscription_plan_code" value: @"starter"];

json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

// First, let's get the current date/time in the Unix Epoch Timestamp format (which is just an integer)
CkoDateTime *dt = [[CkoDateTime alloc] init];
[dt SetFromCurrentSystemTime];
// Get the UTC time.
BOOL bLocalTime = NO;
NSString *unixEpochTimestamp = [dt GetAsUnixTimeStr: bLocalTime];

// Build the string to sign:
[sbStringToSign Append: httpVerb];
[sbStringToSign Append: @"&"];
[sbStringToSign Append: uriPath];
[sbStringToSign Append: @"&"];
[sbStringToSign Append: queryParamsStr];
[sbStringToSign Append: @"&"];
// Make sure to send the JSON body of a request in compact form..
json.EmitCompact = YES;
[sbStringToSign Append: [json Emit]];

// Use your API key here:
NSString *your_api_key = @"f9a7c8ebdfd34beaf260d9b0296c7059";

int numReplaced = [[sbStringToSign Replace: @"YOUR_API_KEY" replacement: your_api_key] intValue];
numReplaced = [[sbStringToSign Replace: @"UNIX_EPOCH_TIMESTAMP" replacement: unixEpochTimestamp] intValue];

// Do the HMAC-SHA256 with your API secret:
NSString *your_api_secret = @"ea210785fa4656af03c2e4ffcc2e7b5fc19f1fba577d137905cc97e74e1df53d";
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.MacAlgorithm = @"hmac";
crypt.EncodingMode = @"hexlower";
[crypt SetMacKeyString: your_api_secret];
crypt.HashAlgorithm = @"sha256";

NSString *api_signature = [crypt MacStringENC: [sbStringToSign GetAsString]];
NSLog(@"%@%@",@"api_signature: ",api_signature);

// --------------------------------------------------------------------
// Here's an example showing how to use the signature in a request:

// Build a new string-to-sign and create a new api_signature for the actual request we'll be sending...
[sbStringToSign Clear];
[sbStringToSign Append: @"GET"];
[sbStringToSign Append: @"&"];
[sbStringToSign Append: @"/app.shippingeasy.com/api/orders"];
[sbStringToSign Append: @"&"];
[sbStringToSign Append: queryParamsStr];
[sbStringToSign Append: @"&"];
// There is no body for a GET request.

api_signature = [crypt MacStringENC: [sbStringToSign GetAsString]];

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

[queryParams UpdateString: @"api_signature" value: api_signature];
[queryParams UpdateString: @"api_timestamp" value: unixEpochTimestamp];
[queryParams UpdateString: @"api_key" value: your_api_key];

CkoHttpResponse *resp = [http QuickRequestParams: @"GET" url: @"https://app.shippingeasy.com/api/orders" json: queryParams];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@%d",@"response status code = ",[resp.StatusCode intValue]);
NSLog(@"%@",@"response body:");
NSLog(@"%@",resp.BodyStr);