Objective-C

Dropbox Refresh OAuth2 Access Token

See more Dropbox Examples

Demonstrates how to mint a new access token using the refresh token obtained when originally getting the OAuth2 access token. Objective-C

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

BOOL success = NO;

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

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

//  Implements the following CURL command:

//  curl -X GET https://api.dropbox.com/oauth2/token \
//      -d grant_type=refresh_token \
//      -d refresh_token=<YOUR_REFRESH_TOKEN> \
//      -u <YOUR_APP_KEY>:<YOUR_APP_SECRET>

//  Use the following online tool to generate HTTP code from a CURL command
//  Convert a cURL Command to HTTP Source Code

http.Login = @"DROPBOX_APP_KEY";
http.Password = @"DROPBOX_APP_SECRET";

//  Get the refresh token from the JSON we saved when originally getting the access token.
//  (See Get Dropbox OAuth2 Access Token w/ Refresh Token
CkoJsonObject *json = [[CkoJsonObject alloc] init];
success = [json LoadFile: @"qa_data/tokens/dropbox.json"];
if (success == NO) {
    NSLog(@"%@",json.LastErrorText);
    return;
}

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
[req AddParam: @"grant_type" value: @"refresh_token"];
[req AddParam: @"refresh_token" value: [json StringOf: @"refresh_token"]];

req.HttpVerb = @"POST";
req.ContentType = @"application/x-www-form-urlencoded";

CkoHttpResponse *resp = [[CkoHttpResponse alloc] init];
success = [http HttpReq: @"https://api.dropbox.com/oauth2/token" request: req response: resp];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
[resp GetBodySb: sbResponseBody];

CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[jResp LoadSb: sbResponseBody];
jResp.EmitCompact = NO;

NSLog(@"%@",@"Response Body:");
NSLog(@"%@",[jResp Emit]);

int respStatusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"Response Status Code = ",respStatusCode);
if (respStatusCode >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",resp.Header);
    NSLog(@"%@",@"Failed.");
    return;
}

//  Sample JSON response:
//  (Sample code for parsing the JSON response is shown below)

//  {
//    "access_token": "sl.AC75WPYRqOi0mxcRqlimbV9FKHu04biz5qHwatG3MTgzFK7kLrGVlM9EgP4603tE7bWw0s1rMbTKiHsf37TUshPYvq-3r0qeBr_PrZIAibN8XOQicvboiOnqx6JrDekq-w8D-tE",
//    "token_type": "bearer",
//    "expires_in": 14400
//  }

NSString *access_token = [jResp StringOf: @"access_token"];
NSLog(@"%@%@",@"New Access Token: ",access_token);

//  Perhaps update our Dropbox JSON file with the new access token.
//  (The existing refresh token does not change, and can be used over and over to mint new access tokens.)
[json UpdateString: @"access_token" value: access_token];

[json WriteFile: @"qa_data/tokens/dropbox.json"];