Java

LinkedIn OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to get a LinkedIn OAuth2 access token from a desktop application or script.

Note: This example requires Chilkat v10.1.2 or later.

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.OAuth2;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        // To further clarify, see OAuth 2.0 Authorization Flow

        OAuth2 oauth2 = new OAuth2();

        // The port should match the Authorized Redirect URL in your LinkedIn app,
        // which would look like "http://localhost:3017/"
        // See a screenshot below...
        oauth2.setListenPort(3017);

        oauth2.setAuthorizationEndpoint("https://www.linkedin.com/oauth/v2/authorization");
        oauth2.setTokenEndpoint("https://www.linkedin.com/oauth/v2/accessToken");

        // Replace these with actual values.
        oauth2.setClientId("CLIENT_ID");
        oauth2.setClientSecret("CLIENT_SECRET");
        oauth2.setScope("w_member_social");

        // Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
        String url;
        try {
            url = oauth2.startAuth();

            // Launch the default browser on the system and navigate to the url.
            // The LaunchBrowser method was added in Chilkat v10.1.2.
            oauth2.launchBrowser(url);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Wait for the interactive user to grant permission in the interactive browser session.
        // We'll wait for a max of 90 seconds.
        int numMsWaited = 0;
        while ((numMsWaited < 90000) && (oauth2.getAuthFlowState() < 3)) {
            oauth2.sleepMs(100);
            numMsWaited = numMsWaited + 100;
        }

        // If there was no response from the browser within 90 seconds, then
        // the AuthFlowState will be equal to 1 or 2.
        // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
        // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
        // In that case, cancel the background task started in the call to StartAuth.
        if (oauth2.getAuthFlowState() < 3) {
            oauth2.cancel();
            System.out.println("No response from the browser!");
            return;
        }

        // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
        // The possible AuthFlowState values are:
        // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
        // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
        // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
        if (oauth2.getAuthFlowState() == 5) {
            System.out.println("OAuth2 failed to complete.");
            System.out.println(oauth2.getFailureInfo());
            return;
        }

        if (oauth2.getAuthFlowState() == 4) {
            System.out.println("OAuth2 authorization was denied.");
            System.out.println(oauth2.getAccessTokenResponse());
            return;
        }

        if (oauth2.getAuthFlowState() != 3) {
            System.out.println("Unexpected AuthFlowState:" + oauth2.getAuthFlowState());
            return;
        }

        System.out.println("OAuth2 authorization granted!");
        System.out.println("Access Token = " + oauth2.getAccessToken());

        System.out.println("Full JSON Response = " + oauth2.getAccessTokenResponse());

        // Example JSON Response:
        //
        // {
        //   "access_token": "AQU7C5zU8n....ggWyUA",
        //   "expires_in": 5183999,
        //   "scope": "w_member_social"
        // }

        // Save the full JSON access token response to a file.
        StringBuilder sbJson = new StringBuilder();
        sbJson.append(oauth2.getAccessTokenResponse());
        sbJson.writeFile("qa_data/tokens/_linkedIn.json", "utf-8", false);

        // Here is an example showing how to define your App in the LinkedIn developers console:
        // 
    }
}