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Rapidoid OAuth
There is a newer version: 5.5.5
package org.rapidoid.oauth;

/*
 * #%L
 * rapidoid-oauth
 * %%
 * Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import org.apache.oltu.oauth2.client.request.OAuthClientRequest;
import org.apache.oltu.oauth2.common.exception.OAuthSystemException;
import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.config.Conf;
import org.rapidoid.config.Config;
import org.rapidoid.gui.GUI;
import org.rapidoid.http.HttpUtils;
import org.rapidoid.http.Req;
import org.rapidoid.http.ReqHandler;
import org.rapidoid.log.Log;
import org.rapidoid.render.Template;
import org.rapidoid.render.Templates;
import org.rapidoid.setup.Setup;
import org.rapidoid.u.U;
import org.rapidoid.util.Msc;
import org.rapidoid.value.Value;

@Authors("Nikolche Mihajlovski")
@Since("2.0.0")
public class OAuth extends RapidoidThing {

	private static final Template LOGIN_BTN = Templates.load("oauth-login-button.html");

	private static OAuthStateCheck STATE_CHECK;

	private static final Config OAUTH = Conf.OAUTH;

	private static final Value DOMAIN = Conf.APP.entry("domain").str();

	public static void bootstrap(Setup setup) {
		register(setup, new DefaultOAuthStateCheck());
	}

	public static void register(Setup setup, OAuthProvider... providers) {
		register(setup, new DefaultOAuthStateCheck(), providers);
	}

	public static void register(Setup setup, OAuthStateCheck stateCheck, OAuthProvider... providers) {

		if (OAUTH.isEmpty()) {
			Log.warn("OAuth is not configured!");
		}

		OAuth.STATE_CHECK = stateCheck;

		if (providers == null || providers.length == 0) {
			providers = OAuthProvider.PROVIDERS;
		}

		final StringBuilder loginHtml = new StringBuilder();
		loginHtml.append("");

		for (OAuthProvider provider : providers) {
			String name = provider.getName().toLowerCase();

			String loginUri = Msc.specialUri(name + "Login");
			String callbackUri = Msc.specialUri(name + "OauthCallback");

			Config providerConfig = OAUTH.sub(name);
			Value clientId = providerConfig.entry("clientId").str();
			Value clientSecret = providerConfig.entry("clientSecret").str();

			setup.get(loginUri).html(new OAuthLoginHandler(provider, DOMAIN));
			setup.get(callbackUri).html(new OAuthTokenHandler(provider, setup.custom(), DOMAIN, stateCheck, clientId, clientSecret, callbackUri));

			loginHtml.append(LOGIN_BTN.render(U.map("uri", loginUri, "provider", provider.getName())));
		}

		loginHtml.append("");
		final String loginPage = loginHtml.toString();

		setup.get(Msc.specialUri("oauth")).mvc(new ReqHandler() {
			@Override
			public Object execute(Req x) throws Exception {
				return GUI.hardcoded(loginPage);
			}
		});
	}

	public static String getLoginURL(Req req, OAuthProvider provider, String oauthDomain) {

		if (OAUTH.isEmpty()) {
			Log.warn("OAuth is not configured!");
		}

		String name = provider.getName().toLowerCase();

		Config providerConfig = OAUTH.sub(name);
		Value clientId = providerConfig.entry("clientId").str();
		Value clientSecret = providerConfig.entry("clientSecret").str();

		String callbackPath = Msc.specialUri(name + "OauthCallback");

		boolean popup = req.param("popup", null) != null;

		String redirectUrl = U.notEmpty(oauthDomain) ? oauthDomain + callbackPath : HttpUtils.constructUrl(req,
			callbackPath);

		String statePrefix = popup ? "P" : "N";
		String state = statePrefix + STATE_CHECK.generateState(clientSecret, req.sessionId());

		try {
			OAuthClientRequest request = OAuthClientRequest.authorizationLocation(provider.getAuthEndpoint())
				.setClientId(clientId.str().get()).setRedirectURI(redirectUrl).setScope(provider.getEmailScope())
				.setState(state).setResponseType("code").buildQueryMessage();
			return request.getLocationUri();
		} catch (OAuthSystemException e) {
			throw U.rte(e);
		}
	}

}