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Spring library of the jsonhome project.
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/*
 * Copyright 2012 Guido Steinacker
 *
 * 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 de.otto.jsonhome.controller;

import de.otto.jsonhome.generator.JsonHomeSource;
import de.otto.jsonhome.model.JsonHome;
import de.otto.jsonhome.model.ResourceLink;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;

import static org.springframework.http.HttpStatus.NOT_FOUND;


/**
 * This controller is handling the /rel resource: link-relation types.
 *
 * @author Guido Steinacker
 * @since 15.09.12
 */
@Controller
public class HtmlController {

    private static Logger LOG = LoggerFactory.getLogger(HtmlController.class);

    private JsonHomeSource jsonHomeSource;
    private URI relationTypeBaseUri;
    private int maxAge = 3600;

    @Autowired
    public void setJsonHomeSource(final JsonHomeSource jsonHomeSource) {
        this.jsonHomeSource = jsonHomeSource;
    }

    @Value("${jsonhome.relationTypeBaseUri}")
    public void setRelationTypeBaseUri(String relationTypeBaseUri) {
        this.relationTypeBaseUri = URI.create(relationTypeBaseUri);
        LOG.info("RelationTypeBaseUri is {}", relationTypeBaseUri);
    }

    public void setMaxAgeSeconds(int maxAge) {
        this.maxAge = maxAge;
        LOG.info("MaxAge is {}", maxAge);
    }

    public URI relationTypeBaseUri() {
        return relationTypeBaseUri;
    }


    @RequestMapping(
            value = "/json-home",
            method = RequestMethod.GET,
            produces = "text/html")
    @ResponseBody
    public ModelAndView getHtmlHomeDocument(final HttpServletRequest request,
                                            final HttpServletResponse response) {
        // home document should be cached:
        response.setHeader("Cache-Control", "max-age=" + maxAge);
        response.setHeader("Vary", "Accept");
        final Map resources = new HashMap<>();
        resources.put("resources", jsonHomeSource.getJsonHome().getResources().values());
        resources.put("contextpath", request.getContextPath());
        return new ModelAndView("resources", resources);
    }


    @RequestMapping(
            value = "/rel/**",
            method = RequestMethod.GET,
            produces = "text/html"
    )
    public ModelAndView getRelationshipType(final HttpServletRequest request) {

        final URI relationTypeURI = URI.create(request.getRequestURL().toString());


        final Map model = new HashMap<>();
        model.put("contextpath", request.getContextPath());
        final JsonHome jsonHome = jsonHomeSource.getJsonHome();
        if (jsonHome.hasResourceFor(relationTypeURI)) {
            final ResourceLink resourceLink = jsonHome.getResourceFor(relationTypeURI);
            model.put("resource", resourceLink);
            if (resourceLink.isDirectLink()) {
                return new ModelAndView("directresource", model);
            } else {
                return new ModelAndView("templatedresource", model);
            }
        } else {
            throw new IllegalArgumentException("Unknown relation type " + relationTypeURI);
        }
    }

    @ResponseStatus(value = NOT_FOUND)
    @ExceptionHandler({IllegalArgumentException.class})
    public void handleNotFound(final HttpServletResponse response) throws IOException {
        response.sendError(404, "Unknown link-relation type.");
    }
}