Java

Dropbox Refresh OAuth2 Access Token

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

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

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

    CkHttp http = new CkHttp();

    //  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.put_Login("DROPBOX_APP_KEY");
    http.put_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
    CkJsonObject json = new CkJsonObject();
    success = json.LoadFile("qa_data/tokens/dropbox.json");
    if (success == false) {
        System.out.println(json.lastErrorText());
        return;
        }

    CkHttpRequest req = new CkHttpRequest();
    req.AddParam("grant_type","refresh_token");
    req.AddParam("refresh_token",json.stringOf("refresh_token"));

    req.put_HttpVerb("POST");
    req.put_ContentType("application/x-www-form-urlencoded");

    CkHttpResponse resp = new CkHttpResponse();
    success = http.HttpReq("https://api.dropbox.com/oauth2/token",req,resp);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkStringBuilder sbResponseBody = new CkStringBuilder();
    resp.GetBodySb(sbResponseBody);

    CkJsonObject jResp = new CkJsonObject();
    jResp.LoadSb(sbResponseBody);
    jResp.put_EmitCompact(false);

    System.out.println("Response Body:");
    System.out.println(jResp.emit());

    int respStatusCode = resp.get_StatusCode();
    System.out.println("Response Status Code = " + respStatusCode);
    if (respStatusCode >= 400) {
        System.out.println("Response Header:");
        System.out.println(resp.header());
        System.out.println("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
    //  }

    String access_token = jResp.stringOf("access_token");
    System.out.println("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",access_token);

    json.WriteFile("qa_data/tokens/dropbox.json");
  }
}