xbdd.webapp.rest.BasicAuthFilter.java Source code

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Here is the source code for xbdd.webapp.rest.BasicAuthFilter.java

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/**
 * Copyright (C) 2015 Orion Health (Orchestral Development Ltd)
 *
 * 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 xbdd.webapp.rest;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.StringUtils;

/**
 * Simple authentication filter that checks for basic authentication headers and otherwise defers to the realm's authentication mechanism.
 */
public class BasicAuthFilter implements Filter {

    private static final String AUTHORIZATION_HEADER = "Authorization";
    private static final String BASIC_PREFIX = "Basic ";
    private static final String BASIC_AUTH_SEPARATOR = ":";

    @Override
    public void destroy() {

    }

    @Override
    public void doFilter(final ServletRequest request, final ServletResponse response,
            final FilterChain filterChain) throws IOException, ServletException {
        final HttpServletRequest httpRequest = (HttpServletRequest) request;
        final HttpServletResponse httpResponse = (HttpServletResponse) response;

        if (httpRequest.getUserPrincipal() == null) {
            final String basicAuth = httpRequest.getHeader(AUTHORIZATION_HEADER);

            if (basicAuth != null && StringUtils.startsWithIgnoreCase(basicAuth, BASIC_PREFIX)) {
                final String usernamePassword = new String(
                        Base64.decodeBase64(basicAuth.substring(BASIC_PREFIX.length()).trim()), "UTF-8");
                final String[] args = usernamePassword.split(BASIC_AUTH_SEPARATOR, 2);
                httpRequest.login(args[0], args[1]);
            } else {
                httpRequest.authenticate(httpResponse);
                return;
            }
        }

        filterChain.doFilter(request, response);
    }

    @Override
    public void init(final FilterConfig arg0) throws ServletException {

    }

}