Java

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. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Http;
import com.chilkatsoft.chilkat2.HttpRequest;
import com.chilkatsoft.chilkat2.HttpResponse;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Http http = new Http();

        // 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.setLogin("DROPBOX_APP_KEY");
        http.setPassword("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
        JsonObject json = new JsonObject();
        try {
            json.loadFile("qa_data/tokens/dropbox.json");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        HttpRequest req = new HttpRequest();
        req.addParam("grant_type", "refresh_token");
        req.addParam("refresh_token", json.stringOf("refresh_token"));

        req.setHttpVerb("POST");
        req.setContentType("application/x-www-form-urlencoded");

        HttpResponse resp = new HttpResponse();
        try {
            http.httpReq("https://api.dropbox.com/oauth2/token", req, resp);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        StringBuilder sbResponseBody = new StringBuilder();
        resp.getBodySb(sbResponseBody);

        JsonObject jResp = new JsonObject();
        jResp.loadSb(sbResponseBody);
        jResp.setEmitCompact(false);

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

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