Java Requires Chilkat v10.1.2+

Slack OAuth2

See more OAuth2 Examples

Slack OAuth2 Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.FileAccess;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.OAuth2;

public class ChilkatExample {

    public static void main(String[] args) {
        // For more information about the OAuth2, see OAuth 2.0 Authorization Flow

        OAuth2 oauth2 = new OAuth2();

        // This example is for desktop applicatons (it is not for code that runs on a web server).

        // Your applicaton must use your own public web server as an intermediate
        // to receive and forward the redirect to localhost.
        // See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

        // This is the Redirect URL defined for your Slack App in the Slack developer portal, and contains the above PHP.
        oauth2.setAppCallbackUrl("https://yourwebserver.com/oauth2_redirect");
        oauth2.setListenPort(3017);

        oauth2.setAuthorizationEndpoint("https://slack.com/oauth/authorize");
        oauth2.setTokenEndpoint("https://slack.com/api/oauth.access");

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

        oauth2.setScope("team:read users:read");

        // Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
        String url;
        try {
            url = oauth2.startAuth();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("url = " + url);

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

        // Wait for the user to approve or deny authorization in the browser.
        int numMsWaited = 0;
        while ((numMsWaited < 90000) && (oauth2.getAuthFlowState() < 3)) {
            oauth2.sleepMs(100);
            numMsWaited = numMsWaited + 100;
        }

        // If the browser does not respond within the specified time, AuthFlowState will be:
        //
        // 1: Waiting for Redirect - The OAuth2 background thread is waiting for the browser's redirect request.
        // 2: Waiting for Final Response - The thread is awaiting the final access token response.
        // In either case, cancel the background task initiated by StartAuth.

        if (oauth2.getAuthFlowState() < 3) {
            oauth2.cancel();
            System.out.println("No response from the browser!");
            return;
        }

        // Check AuthFlowState to determine if authorization was granted, denied, or failed:
        //
        // 3: Success - OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
        // 4: Access Denied - OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
        // 5: Failure - OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

        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());

        // Get the full JSON response:
        JsonObject json = new JsonObject();
        json.load(oauth2.getAccessTokenResponse());
        json.setEmitCompact(false);

        // The JSON response looks like this:

        // {
        //   "ok": true,
        //   "access_token": "xoxp-348475395242-348621810805-4768936228341-9f512b295124e7c9846ce63cb1464c4d",
        //   "scope": "identify,team:read,users:read",
        //   "user_id": "UA8HZRUPP",
        //   "team_id": "TA3DZBN74",
        //   "enterprise_id": null,
        //   "team_name": "Chilkat Testing"
        // }

        System.out.println(json.emit());

        // Save the JSON to a file for future requests.
        FileAccess fac = new FileAccess();
        fac.writeEntireTextFile("qa_data/tokens/slack.json", json.emit(), "utf-8", false);
    }
}