(Objective-C) Wish for Merchants -- Get OAuth2 Access Token for Desktop App

Demonstrates how to get a Wish for Merchants OAuth2 access token from a desktop application or script.

Note: This example requires Chilkat v10.1.2 or greater.

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#import <CkoOAuth2.h>
#import <NSString.h>
#import <CkoStringBuilder.h>

// To further clarify, see OAuth 2.0 Authorization Flow

// This example is for desktop applicatons (it is not for code that runs on a web server).

// This is the way to initially obtain the OAuth2 access token.  Afterwards it can be 
// repeatedly refreshed without user interaction, as shown in this example: Refresh Wish OAuth2 Access Token.

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

// Wish OAuth2 does not allow a localhost callback URI such as "http://localhost:<portNumber>/"
// For a desktop app, you must provide a script on your web server to redirect to "http://localhost/<portNumber>"

// Your applicaton must use your own public web server as an intermediate
// to receive and forward the redirect to localhost.
// See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost
oauth2.AppCallbackUrl = @"https://yourwebserver.com/OAuth2.php";
oauth2.ListenPort = [NSNumber numberWithInt:3017];

oauth2.AuthorizationEndpoint = @"https://merchant.wish.com/v3/oauth/authorize";
oauth2.TokenEndpoint = @"https://merchant.wish.com/api/v3/oauth/access_token";

oauth2.UncommonOptions = @"EXCHANGE_CODE_FOR_TOKEN_USING_GET";

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

oauth2.Scope = @"";

// Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
NSString *url = [oauth2 StartAuth];
if (oauth2.LastMethodSuccess != YES) {
    NSLog(@"%@",oauth2.LastErrorText);
    return;
}

NSLog(@"%@%@",@"url = ",url);

// Launch the default browser on the system and navigate to the url.
// The LaunchBrowser method was added in Chilkat v10.1.2.
BOOL success = [oauth2 LaunchBrowser: url];
if (success == NO) {
    NSLog(@"%@",oauth2.LastErrorText);
    return;
}

// Wait for the user to approve or deny authorization in the browser.
int numMsWaited = 0;
while ((numMsWaited < 90000) && ([oauth2.AuthFlowState intValue] < 3)) {
    [oauth2 SleepMs: [NSNumber numberWithInt: 100]];
    numMsWaited = numMsWaited + 100;
}

// If the browser does not respond within the specified time, AuthFlowState will be:
// 
// 1: Waiting for Redirect - The OAuth2 background thread is waiting for the browser's redirect request.
// 2: Waiting for Final Response - The thread is awaiting the final access token response.
// In either case, cancel the background task initiated by StartAuth.

if ([oauth2.AuthFlowState intValue] < 3) {
    [oauth2 Cancel];
    NSLog(@"%@",@"No response from the browser!");
    return;
}

// Check AuthFlowState to determine if authorization was granted, denied, or failed:
// 
// 3: Success - OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
// 4: Access Denied - OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
// 5: Failure - OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if ([oauth2.AuthFlowState intValue] == 5) {
    NSLog(@"%@",@"OAuth2 failed to complete.");
    NSLog(@"%@",oauth2.FailureInfo);
    return;
}

if ([oauth2.AuthFlowState intValue] == 4) {
    NSLog(@"%@",@"OAuth2 authorization was denied.");
    NSLog(@"%@",oauth2.AccessTokenResponse);
    return;
}

if ([oauth2.AuthFlowState intValue] != 3) {
    NSLog(@"%@%d",@"Unexpected AuthFlowState:",[oauth2.AuthFlowState intValue]);
    return;
}

// Save the full JSON access token response to a file.
CkoStringBuilder *sbJson = [[CkoStringBuilder alloc] init];
[sbJson Append: oauth2.AccessTokenResponse];
[sbJson WriteFile: @"qa_data/tokens/wish.json" charset: @"utf-8" emitBom: NO];

// The full JSON received looks like this:
// {
//   "message": "",
//   "code": 0,
//   "data": {
//     "access_token": "15af1c191c1243b029bc1660b5c08ce7",
//     "scopes": [
//       "epc:read",
//       "epc:write",
//       "fbs:read",
//       "fbs:write",
//       "fbw:read",
//       "fbw:write",
//       "infractions:read",
//       "infractions:write",
//       "insurance:read",
//       "insurance:write",
//       "loans:read",
//       "loans:write",
//       "merchant:read",
//       "merchant:write",
//       "notifications:read",
//       "notifications:write",
//       "orders:read",
//       "orders:write",
//       "payments:read",
//       "payments:write",
//       "penalties:read",
//       "penalties:write",
//       "product_boost:read",
//       "product_boost:write",
//       "products:read",
//       "products:write",
//       "ratings:read",
//       "ratings:write",
//       "returns:read",
//       "returns:write",
//       "tickets:read",
//       "tickets:write"
//     ],
//     "merchant_id": "5eb3f605178f5be2c784fa02",
//     "expiry_time": "2020-12-17T16:55:09.594+00:00",
//     "refresh_token": "55a38e44df674a1e859891624b2c4c23"
//   }
// }

NSLog(@"%@",@"OAuth2 authorization granted!");
NSLog(@"%@%@",@"Access Token = ",oauth2.AccessToken);