eu.euregjug.site.assets.AssetApiController.java Source code

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Here is the source code for eu.euregjug.site.assets.AssetApiController.java

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/*
 * Copyright 2015 EuregJUG.
 *
 * 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 eu.euregjug.site.assets;

import com.mongodb.gridfs.GridFSDBFile;
import java.io.IOException;
import java.io.InputStream;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tika.Tika;
import org.apache.tika.io.TikaInputStream;
import org.apache.tika.mime.MediaType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;
import org.springframework.security.access.prepost.PreAuthorize;
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.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import static java.time.ZoneId.of;
import static java.time.ZonedDateTime.now;
import static java.time.format.DateTimeFormatter.RFC_1123_DATE_TIME;
import static org.springframework.web.bind.annotation.RequestMethod.POST;

/**
 * @author Michael J. Simons, 2015-12-29
 */
@Controller
@RequestMapping("/api/assets")
public class AssetApiController {

    public static final Logger logger = LoggerFactory.getLogger(AssetApiController.class.getPackage().getName());

    private final Tika tika;

    private final GridFsTemplate gridFs;

    @Autowired
    public AssetApiController(GridFsTemplate gridFs) {
        this.tika = new Tika();
        this.gridFs = gridFs;
    }

    @RequestMapping(method = POST)
    @PreAuthorize("isAuthenticated()")
    public @ResponseBody String create(final @RequestParam("assetData") MultipartFile assetData)
            throws IOException {

        // Check duplicates
        final GridFSDBFile file = this.gridFs
                .findOne(Query.query(Criteria.where("filename").is(assetData.getOriginalFilename())));
        if (file != null) {
            throw new DataIntegrityViolationException(
                    String.format("Asset with name '%s' already exists", assetData.getOriginalFilename()));
        } else {
            try (InputStream _in = TikaInputStream.get(assetData.getInputStream())) {
                MediaType mediaType = null;
                try {
                    mediaType = MediaType.parse(tika.detect(_in, assetData.getOriginalFilename()));
                } catch (IOException e) {
                    logger.warn("Could not detect content type", e);
                }
                this.gridFs.store(assetData.getInputStream(), assetData.getOriginalFilename(),
                        Optional.ofNullable(mediaType).map(MediaType::toString).orElse(null));
                return assetData.getOriginalFilename();
            }
        }
    }

    @RequestMapping({ "/{filename:.+}" })
    public void get(final @PathVariable String filename, final HttpServletRequest request,
            final HttpServletResponse response) throws IOException {
        final GridFSDBFile file = this.gridFs.findOne(Query.query(Criteria.where("filename").is(filename)));
        if (file == null) {
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
        } else {
            final int cacheForDays = 365;
            response.setHeader("Content-Type", file.getContentType());
            response.setHeader("Content-Disposition", String.format("inline; filename=\"%s\"", file.getFilename()));
            response.setHeader("Expires", now(of("UTC")).plusDays(cacheForDays).format(RFC_1123_DATE_TIME));
            response.setHeader("Cache-Control",
                    String.format("max-age=%d, %s", TimeUnit.DAYS.toSeconds(cacheForDays), "public"));
            file.writeTo(response.getOutputStream());
            response.flushBuffer();
        }
    }
}