com.greglturnquist.springagram.fileservice.mongodb.ApplicationController.java Source code

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Here is the source code for com.greglturnquist.springagram.fileservice.mongodb.ApplicationController.java

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/*
 * Copyright 2015 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.greglturnquist.springagram.fileservice.mongodb;

import static org.springframework.hateoas.mvc.ControllerLinkBuilder.*;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.InputStreamResource;
import org.springframework.data.mongodb.gridfs.GridFsResource;
import org.springframework.hateoas.Link;
import org.springframework.hateoas.ResourceSupport;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * @author Greg Turnquist
 */
@RestController
public class ApplicationController {

    private static final Logger log = LoggerFactory.getLogger(ApplicationController.class);

    private final FileService fileService;

    @Autowired
    public ApplicationController(FileService fileService) {
        this.fileService = fileService;
    }

    @RequestMapping(method = RequestMethod.POST, value = "/files")
    public ResponseEntity<?> newFile(@RequestParam("name") String filename,
            @RequestParam("file") MultipartFile file) {

        if (!file.isEmpty()) {
            try {
                this.fileService.saveFile(file.getInputStream(), filename);

                Link link = linkTo(methodOn(ApplicationController.class).getFile(filename)).withRel(filename);
                return ResponseEntity.created(new URI(link.getHref())).build();

            } catch (IOException | URISyntaxException e) {
                return ResponseEntity.badRequest().body("Couldn't process the request");
            }
        } else {
            return ResponseEntity.status(HttpStatus.NOT_ACCEPTABLE).body("File is empty");
        }
    }

    @RequestMapping(method = RequestMethod.GET, value = "/files")
    public ResponseEntity<ResourceSupport> listAllFiles() {

        ResourceSupport files = new ResourceSupport();

        for (GridFsResource resource : this.fileService.findAll()) {
            files.add(linkTo(methodOn(ApplicationController.class).getFile(resource.getFilename()))
                    .withRel(resource.getFilename()));
        }

        return ResponseEntity.ok(files);
    }

    @RequestMapping(method = RequestMethod.GET, value = "/files/{filename}")
    public ResponseEntity<?> getFile(@PathVariable String filename) {

        GridFsResource file = this.fileService.findOne(filename);

        if (file == null) {
            return ResponseEntity.notFound().build();
        }

        try {
            return ResponseEntity.ok().contentLength(file.contentLength())
                    .contentType(MediaType.parseMediaType(file.getContentType()))
                    .body(new InputStreamResource(file.getInputStream()));
        } catch (IOException e) {
            return ResponseEntity.badRequest().body("Couldn't process the request");
        }
    }

    @RequestMapping(method = RequestMethod.DELETE, value = "/files/{filename}")
    public ResponseEntity<?> deleteFile(@PathVariable String filename) {

        this.fileService.deleteOne(filename);

        return ResponseEntity.noContent().build();
    }

    /**
     * Suffixes like ".jpg" should be part of the path and not extracted for content negotiation.
     */
    @Configuration
    static class AllResources extends WebMvcConfigurerAdapter {

        @Override
        public void configurePathMatch(PathMatchConfigurer matcher) {
            matcher.setUseSuffixPatternMatch(false);
        }

    }
}