/*
* Licensed to Jasig under one or more contributor license
* agreements. See the NOTICE file distributed with this work
* for additional information regarding copyright ownership.
* Jasig licenses this file to you 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 the following location:
*
* 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.
*/
package org.jasig.cas.support.oauth;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Iterator;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.jasig.cas.services.RegisteredService;
import org.jasig.cas.services.ServicesManager;
import org.jasig.cas.support.oauth.services.OAuthRegisteredService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.RedirectView;
/**
* This class has some usefull methods to output data in plain text,
* handle redirects, add parameter in url or find the right provider.
*
* @author Jerome Leleu
* @since 3.5.0
*/
public final class OAuthUtils {
private static final Logger LOGGER = LoggerFactory.getLogger(OAuthUtils.class);
private OAuthUtils() {}
/**
* Write to the output this error text and return a null view.
*
* @param response http response
* @param error error message
* @param status status code
* @return a null view
*/
public static ModelAndView writeTextError(final HttpServletResponse response, final String error, final int status) {
return OAuthUtils.writeText(response, "error=" + error, status);
}
/**
* Write to the output the text and return a null view.
*
* @param response http response
* @param text output text
* @param status status code
* @return a null view
*/
public static ModelAndView writeText(final HttpServletResponse response, final String text, final int status) {
PrintWriter printWriter;
try {
printWriter = response.getWriter();
response.setStatus(status);
printWriter.print(text);
} catch (final IOException e) {
LOGGER.error("Failed to write to response", e);
}
return null;
}
/**
* Return a view which is a redirection to an url with an error parameter.
*
* @param url redirect url
* @param error error message
* @return A view which is a redirection to an url with an error parameter
*/
public static ModelAndView redirectToError(final String url, final String error) {
String useUrl = url;
if (StringUtils.isBlank(useUrl)) {
useUrl = "/";
}
return OAuthUtils.redirectTo(OAuthUtils.addParameter(useUrl, "error", error));
}
/**
* Return a view which is a redirection to an url.
*
* @param url redirect url
* @return A view which is a redirection to an url
*/
public static ModelAndView redirectTo(final String url) {
return new ModelAndView(new RedirectView(url));
}
/**
* Add a parameter with given name and value to an url.
*
* @param url url to which parameters will be added
* @param name name of parameter
* @param value parameter value
* @return the url with the parameter
*/
public static String addParameter(final String url, final String name, final String value) {
final StringBuilder sb = new StringBuilder();
sb.append(url);
if (url.indexOf("?") >= 0) {
sb.append("&");
} else {
sb.append("?");
}
sb.append(name);
sb.append("=");
if (value != null) {
try {
sb.append(URLEncoder.encode(value, "UTF-8"));
} catch (final UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
return sb.toString();
}
/**
* Locate the requested instance of {@link OAuthRegisteredService} by the given clientId.
* @param servicesManager the service registry DAO instance.
* @param clientId the client id by which the {@link OAuthRegisteredService} is to be located.
* @return null, or the located {@link OAuthRegisteredService} instance in the service registry.
*/
public static OAuthRegisteredService getRegisteredOAuthService(final ServicesManager servicesManager,
final String clientId) {
final Iterator<RegisteredService> it = servicesManager.getAllServices().iterator();
while (it.hasNext()) {
final RegisteredService aService = it.next();
if (aService instanceof OAuthRegisteredService) {
final OAuthRegisteredService service = (OAuthRegisteredService) aService;
if (service.getClientId().equals(clientId)) {
return service;
}
}
}
return null;
}
}