(Objective-C) Twitter PIN-Based Authorization (Step 1)

Demonstrates the 1st step in Twitter PIN-based authorization using OAuth. The purpose of this step is to obtain a temporary request token that will be traded for an access token + secret in the final step. Once the access token + secret is obtained, the application can access the Twitter account in whatever ways it was authorized.

Note: This example requires Chilkat v11.0.0 or greater.

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#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoHttpResponse.h>
#import <NSString.h>

BOOL success = NO;

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

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

http.OAuth1 = YES;
http.OAuthConsumerKey = @"my-consumer-key";
http.OAuthConsumerSecret = @"my-consumer-secret";

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
req.HttpVerb = @"POST";
req.ContentType = @"application/x-www-form-urlencoded";

CkoHttpResponse *resp = [[CkoHttpResponse alloc] init];
success = [http HttpReq: @"https://api.twitter.com/oauth/request_token" request: req response: resp];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

if ([resp.StatusCode intValue] == 200) {

    NSString *oauthToken = [resp UrlEncParamValue: resp.BodyStr paramName: @"oauth_token"];
    NSLog(@"%@%@",@"OAuth temporary request token = ",oauthToken);

    NSString *oauthTokenSecret = [resp UrlEncParamValue: resp.BodyStr paramName: @"oauth_token_secret"];
    NSLog(@"%@%@",@"OAuth temporary token secret = ",oauthTokenSecret);

    NSString *oauthCbConfirmed = [resp UrlEncParamValue: resp.BodyStr paramName: @"oauth_callback_confirmed"];
    NSLog(@"%@%@",@"OAuth callback confirmed  = ",oauthCbConfirmed);

    // At this point, the end-user needs to browse to the following
    // Twitter URL to log in to his/her Twitter account and get a PIN.
    // 
    // https://api.twitter.com/oauth/authenticate?oauth_token=OAUTH_TOKEN
    // 
    // (where OAUTH_TOKEN is replaced with the contents
    // of the OAuth temporary request token.)

    // Your application may have an embedded browser such
    // that it automatically navigates to the above URL, or it may
    // be necessary for the user to browse to this URL independently.

    // Once the PIN is obtained, your application should provide a means
    // for the end-user to enter it (by typing it into an input text box, for example), 
    // and then Step 2 (the final step) can begin.

}
else {
    NSLog(@"%@",http.LastErrorText);
}