YTAuth.java

package org.mcupdater.ravenbot.features;

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.auth.oauth2.StoredCredential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.store.DataStore;
import com.google.api.client.util.store.FileDataStoreFactory;

import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.List;

public class YTAuth {
	public static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
	public static final JsonFactory JSON_FACTORY = new JacksonFactory();
	private static final String CREDENTIALS_DIRECTORY = ".oauth-credentials";

	public static Credential authorize(List<String> scopes, String credentialDatastore) throws IOException {
		Reader clientSecretReader = new InputStreamReader(YTAuth.class.getResourceAsStream("/client_secrets.json"));
		GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, clientSecretReader);

		if (clientSecrets.getDetails().getClientId().startsWith("Enter") || clientSecrets.getDetails().getClientSecret().startsWith("Enter ")) {
			System.out.println("Enter Client ID and Secret from https://code.google.com/apis/console/?api=youtube into src/main/resources/client_secres.json");
			System.exit(1);
		}

		FileDataStoreFactory fileDataStoreFactory= new FileDataStoreFactory(new File(System.getProperty("user.home") + "/" + CREDENTIALS_DIRECTORY));
		DataStore<StoredCredential> dataStore = fileDataStoreFactory.getDataStore(credentialDatastore);

		GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, scopes).setCredentialDataStore(dataStore).build();
		LocalServerReceiver localReceiver = new LocalServerReceiver.Builder().setPort(8080).build();

		return new AuthorizationCodeInstalledApp(flow, localReceiver).authorize("user");
	}
}