Objective-C

Yahoo Mail OAuth2 Access Token for Desktop App

See more Yahoo Mail Examples

Demonstrates how to get a Yahoo Email OAuth2 access token from a desktop application or script. Objective-C

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

BOOL success = NO;

//  First, you must define your app in Yahoo Developer (https://developer.yahoo.com/apps/) like this:

//  

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

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

//  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/oauth_redirect";
oauth2.ListenPort = [NSNumber numberWithInt:3017];

oauth2.AuthorizationEndpoint = @"https://api.login.yahoo.com/oauth2/request_auth";
oauth2.TokenEndpoint = @"https://api.login.yahoo.com/oauth2/get_token";

//  Replace these with actual values.
oauth2.ClientId = @"CLIENT_ID";
oauth2.ClientSecret = @"CLIENT_SECRET";

//  Do not send the "scope" query param for Yahoo OAuth2.
oauth2.UncommonOptions = @"NO_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 == NO) {
    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.
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/yahooMail.json" charset: @"utf-8" emitBom: NO];

//  The saved JSON response looks like this:

//  {
//    "access_token": "kCVQdnOdul...LHucA--",
//    "refresh_token": "AIenVXETSo0jklFBVkPS8vVm8E.Ej9ToRG.xDbDYmZ65WIs5t6CZhDrD",
//    "expires_in": 3600,
//    "token_type": "bearer",
//    "xoauth_yahoo_guid": "HGDQCVF5JB4YDOWHITQJFBHCWA"
//  }

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