(Objective-C) QuickBooks - Automatically Refresh Access Token with No User Interaction

Demonstrates how to automaticaly refresh an expired access token and retry the request after a 401 authorization error.

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#import <CkoJsonObject.h>
#import <CkoRest.h>
#import <CkoStringBuilder.h>
#import <NSString.h>
#import <CkoOAuth2.h>
#import <CkoDateTime.h>
#import <CkoDtObj.h>

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

// Get our previously obtained OAuth2 access token, which should contain JSON like this:
// {
//   "expires_in": 3600,
//   "x_refresh_token_expires_in": 8726400,
//   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
//   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
//   "token_type": "bearer"
// }

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/qb-access-token.json"];

CkoRest *rest = [[CkoRest alloc] init];

// Connect using TLS.
// A single REST object, once connected, can be used for many Quickbooks REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
BOOL bAutoReconnect = YES;
success = [rest Connect: @"sandbox-quickbooks.api.intuit.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

CkoStringBuilder *sbAuth = [[CkoStringBuilder alloc] init];
[sbAuth Append: @"Bearer "];
[sbAuth Append: [jsonToken StringOf: @"access_token"]];
rest.Authorization = [sbAuth GetAsString];

[rest AddHeader: @"Accept" value: @"application/json"];
rest.AllowHeaderFolding = NO;

// The company ID is 123146096291789
// The employee ID is 58
NSString *responseBody = [rest FullRequestNoBody: @"GET" uriPath: @"/v3/company/123146096291789/employee/58?minorversion=45"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// If we get a 401 authorization error, then it's likely because the access token expired.
// We can automatically refresh it without interaction from the user.
if ([rest.ResponseStatusCode intValue] == 401) {

    CkoOAuth2 *oauth2 = [[CkoOAuth2 alloc] init];

    oauth2.TokenEndpoint = @"https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer";

    // Replace these with actual values.
    oauth2.ClientId = @"QUICKBOOKS-CLIENT-ID";
    oauth2.ClientSecret = @"QUICKBOOKS-CLIENT-SECRET";

    // Get the "refresh_token"
    oauth2.RefreshToken = [jsonToken StringOf: @"refresh_token"];

    // Send the HTTP POST to refresh the access token..
    success = [oauth2 RefreshAccessToken];
    if (success != YES) {
        NSLog(@"%@",oauth2.LastErrorText);
        return;
    }

    NSLog(@"%@%@",@"New access token: ",oauth2.AccessToken);

    // Update the JSON with the new tokens.
    [jsonToken UpdateString: @"access_token" value: oauth2.AccessToken];

    // Save the new JSON access token response to a file.
    // The access + refresh tokens contained in this JSON will be needed for the next refresh.
    CkoStringBuilder *sbJson = [[CkoStringBuilder alloc] init];
    jsonToken.EmitCompact = NO;
    [jsonToken EmitSb: sbJson];
    [sbJson WriteFile: @"qa_data/tokens/qb-access-token.json" charset: @"utf-8" emitBom: NO];

    NSLog(@"%@",@"OAuth2 token refreshed!");
    NSLog(@"%@%@",@"New Access Token = ",oauth2.AccessToken);

    [sbAuth Clear];
    [sbAuth Append: @"Bearer "];
    [sbAuth Append: oauth2.AccessToken];
    rest.Authorization = [sbAuth GetAsString];

    // Now retry the request with the refreshed access token...
    responseBody = [rest FullRequestNoBody: @"GET" uriPath: @"/v3/company/123146096291789/employee/58?minorversion=45"];
    if (rest.LastMethodSuccess != YES) {
        NSLog(@"%@",rest.LastErrorText);
        return;
    }

}

// We should expect a 200 response if successful.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@",@"Request Header: ");
    NSLog(@"%@",rest.LastRequestHeader);
    NSLog(@"%@",@"----");
    NSLog(@"%@%d",@"Response StatusCode = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"Response StatusLine: ",rest.ResponseStatusText);
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",rest.ResponseHeader);
    NSLog(@"%@",responseBody);
    return;
}

// Load the JSON response into a JSON object for parsing.
// A sample JSON response is shown below.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: responseBody];

// These will be used for parsing date/time strings..
CkoDateTime *dtime = [[CkoDateTime alloc] init];
BOOL bLocalTime = YES;
CkoDtObj *dt = 0;

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

// Get some information from the JSON..
NSLog(@"%@%@",@"Name: ",[json StringOf: @"Employee.DisplayName"]);
NSLog(@"%@%@",@"Id: ",[json StringOf: @"Employee.Id"]);
NSLog(@"%@%@",@"City: ",[json StringOf: @"Employee.PrimaryAddr.City"]);
NSLog(@"%@%@",@"PostalCode: ",[json StringOf: @"Employee.PrimaryAddr.PostalCode"]);

// Load the CreateTime into a CkDateTime...
[dtime SetFromTimestamp: [json StringOf: @"Employee.MetaData.CreateTime"]];
dt = [dtime GetDtObj: bLocalTime];
NSLog(@"%d%@%d%@%d%@%d%@%d",[dt.Month intValue],@"/",[dt.Day intValue],@"/",[dt.Year intValue],@"  ",[dt.Hour intValue]
    ,@":",[dt.Minute intValue]);

NSLog(@"%@",@"Success.");

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

// ------------------------------------------------------
// The JSON response looks like this:

// {
//   "Employee": {
//     "SSN": "XXX-XX-XXXX",
//     "PrimaryAddr": {
//       "Id": "116",
//       "Line1": "45 N. Elm Street",
//       "City": "Middlefield",
//       "CountrySubDivisionCode": "CA",
//       "PostalCode": "93242"
//     },
//     "BillableTime": false,
//     "domain": "QBO",
//     "sparse": false,
//     "Id": "98",
//     "SyncToken": "0",
//     "MetaData": {
//       "CreateTime": "2015-07-24T09:34:35-07:00",
//       "LastUpdatedTime": "2015-07-24T09:34:35-07:00"
//     },
//     "GivenName": "Bill",
//     "FamilyName": "Miller",
//     "DisplayName": "Bill Miller",
//     "PrintOnCheckName": "Bill Miller",
//     "Active": true,
//     "PrimaryPhone": {
//       "FreeFormNumber": "234-525-1234"
//     }
//   },
//   "time": "2015-07-24T09:35:54.805-07:00"
//