com.kixeye.chassis.transport.swagger.SwaggerServlet.java Source code

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Here is the source code for com.kixeye.chassis.transport.swagger.SwaggerServlet.java

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package com.kixeye.chassis.transport.swagger;

/*
 * #%L
 * Chassis Transport Swagger
 * %%
 * Copyright (C) 2014 KIXEYE, Inc
 * %%
 * 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 java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.springframework.core.io.AbstractFileResolvingResource;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.util.StreamUtils;

/**
 * A servlet to load resources.
 * 
 * @author ebahtijaragic
 */
public class SwaggerServlet extends HttpServlet {
    private static final long serialVersionUID = -691019542966084867L;

    private static final String SWAGGER_DIRECTORY = "classpath:com/kixeye/chassis/transport/swagger";

    private static final String WELCOME_PAGE = "index.html";

    private DefaultResourceLoader resourceLoader = new DefaultResourceLoader();

    private String rootContextPath;

    public SwaggerServlet(String contextPath) {
        this.rootContextPath = contextPath;

        while (rootContextPath.endsWith("*") || rootContextPath.endsWith("/")) {
            rootContextPath = StringUtils.removeEnd(rootContextPath, "*");
            rootContextPath = StringUtils.removeEnd(rootContextPath, "/");
        }
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // figure out the real path
        String pathInfo = StringUtils.trimToEmpty(req.getPathInfo());

        while (pathInfo.endsWith("/")) {
            pathInfo = StringUtils.removeEnd(pathInfo, "/");
        }

        while (pathInfo.startsWith("/")) {
            pathInfo = StringUtils.removeStart(pathInfo, "/");
        }

        if (StringUtils.isBlank(pathInfo)) {
            resp.sendRedirect(rootContextPath + "/" + WELCOME_PAGE);
        } else {
            // get the resource
            AbstractFileResolvingResource resource = (AbstractFileResolvingResource) resourceLoader
                    .getResource(SWAGGER_DIRECTORY + "/" + pathInfo);

            // send it to the response
            if (resource.exists()) {
                StreamUtils.copy(resource.getInputStream(), resp.getOutputStream());
                resp.setStatus(HttpServletResponse.SC_OK);
                resp.flushBuffer();
            } else {
                resp.sendError(HttpServletResponse.SC_NOT_FOUND);
            }
        }
    }
}