com.betfair.tornjak.monitor.overlay.AuthUtils.java Source code

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Here is the source code for com.betfair.tornjak.monitor.overlay.AuthUtils.java

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/*
 * Copyright 2013, The Sporting Exchange Limited
 *
 * 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.
 */

package com.betfair.tornjak.monitor.overlay;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextException;
import org.springframework.web.context.WebApplicationContext;

public class AuthUtils {

    private static final String CONTEXT_ATTR_NAME = "com.betfair.tornjak.monitor.overlay.RolePerms";
    private static final String CONTEXT_INIT_PARAM_NAME = "contextAuthConfigLocation";

    /**
     * Returns null if user is not authenticated or authorised, otherwise returns Auth object.
     * 
     */
    public static Auth checkAuthorised(final HttpServletRequest request, HttpServletResponse response,
            ServletContext servletContext) throws IOException {

        RolePerms rolePerms = getOrCreateRolePerms(servletContext);

        Auth auth = new Auth(new Auth.Validator() {

            @Override
            public boolean isUserInRole(String role) {
                return request.isUserInRole(role);
            }

            @Override
            public boolean isAuthenticated() {
                return request.getUserPrincipal() != null;
            }
        }, rolePerms);

        switch (auth.check()) {
        case UNAUTHORISED:
            response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
            return null;
        case FORBIDDEN:
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return null;
        default:
            return auth;
        }
    }

    private static synchronized RolePerms getOrCreateRolePerms(ServletContext servletContext) throws IOException {
        RolePerms rolePerms;

        rolePerms = (RolePerms) servletContext.getAttribute(CONTEXT_ATTR_NAME);

        if (rolePerms != null) {
            return rolePerms;
        }

        ApplicationContext context = (ApplicationContext) servletContext
                .getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
        if (context == null) {
            throw new ApplicationContextException("Unable to find application context");
        }
        String authFileLocation = servletContext.getInitParameter(CONTEXT_INIT_PARAM_NAME);
        if (StringUtils.isBlank(authFileLocation)) {
            throw new ApplicationContextException(String
                    .format("Parameter '%s' not defined, unable to load jmx auth file", CONTEXT_INIT_PARAM_NAME));
        }

        rolePerms = AuthFileReader.load(context.getResource(authFileLocation));
        servletContext.setAttribute(CONTEXT_ATTR_NAME, rolePerms);

        return rolePerms;

    }
}