ImageController.java

/*
 * Copyright 2012 the original author or authors.
 *
 * 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.github.carlomicieli.nerdmovies.controllers;

import com.github.carlomicieli.nerdmovies.models.Movie;
import org.apache.commons.io.IOUtils;
import org.bson.types.ObjectId;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author Carlo Micieli
 */
@Controller
@RequestMapping("/images")
public class ImageController {
    private MongoTemplate mongoTemplate;

    private enum ImageType {
        POSTER, THUMB
    };

    @Autowired
    public ImageController(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    @RequestMapping(value = "/posters/{movieId}", method = RequestMethod.GET)
    public ResponseEntity<byte[]> renderPoster(@PathVariable String movieId) throws IOException {
        return render(movieId, ImageType.POSTER);
    }

    @RequestMapping(value = "/thumb/{movieId}", method = RequestMethod.GET)
    public ResponseEntity<byte[]> renderThumb(@PathVariable String movieId) throws IOException {
        return render(movieId, ImageType.THUMB);
    }

    private ResponseEntity<byte[]> render(String movieId, ImageType t) throws IOException {
        ObjectId id = new ObjectId(movieId);

        Movie m = mongoTemplate.findById(id, Movie.class);

        byte[] aob = null;
        if (t == ImageType.POSTER)
            aob = m.getPoster();
        else if (t == ImageType.THUMB)
            aob = m.getThumb();

        if (aob == null) return null;

        InputStream in = new ByteArrayInputStream(aob);

        final HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.IMAGE_PNG);
        return new ResponseEntity<byte[]>(IOUtils.toByteArray(in), headers, HttpStatus.CREATED);
    }
}