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FileService.java
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FileService.java
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/*
* Copyright (c) 2021 Oracle and/or its affiliates.
*
* 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 io.helidon.examples.microprofile.multipart;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.util.Map;
import jakarta.enterprise.context.ApplicationScoped;
import jakarta.inject.Inject;
import jakarta.json.Json;
import jakarta.json.JsonArrayBuilder;
import jakarta.json.JsonBuilderFactory;
import jakarta.json.JsonObject;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.PathParam;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.core.StreamingOutput;
import org.glassfish.jersey.media.multipart.BodyPart;
import org.glassfish.jersey.media.multipart.BodyPartEntity;
import org.glassfish.jersey.media.multipart.MultiPart;
/**
* File service.
*/
@Path("/api")
@ApplicationScoped
public class FileService {
private static final JsonBuilderFactory JSON_FACTORY = Json.createBuilderFactory(Map.of());
private final FileStorage storage;
@Inject
FileService(FileStorage storage) {
this.storage = storage;
}
/**
* Upload a file to the storage.
* @param multiPart multipart entity
* @return Response
* @throws IOException if an IO error occurs
*/
@POST
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response upload(MultiPart multiPart) throws IOException {
for (BodyPart part : multiPart.getBodyParts()) {
if ("file[]".equals(part.getContentDisposition().getParameters().get("name"))) {
Files.copy(part.getEntityAs(BodyPartEntity.class).getInputStream(),
storage.create(part.getContentDisposition().getFileName()),
StandardCopyOption.REPLACE_EXISTING);
}
}
return Response.seeOther(URI.create("ui")).build();
}
/**
* Download a file from the storage.
* @param fname file name of the file to download
* @return Response
*/
@GET
@Path("{fname}")
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response download(@PathParam("fname") String fname) {
return Response.ok()
.header("Content-Disposition", "attachment; filename=\"" + fname + "\"")
.entity((StreamingOutput) output -> Files.copy(storage.lookup(fname), output))
.build();
}
/**
* List the files in the storage.
* @return JsonObject
*/
@GET
@Produces(MediaType.APPLICATION_JSON)
public JsonObject list() {
JsonArrayBuilder arrayBuilder = JSON_FACTORY.createArrayBuilder();
storage.listFiles().forEach(arrayBuilder::add);
return JSON_FACTORY.createObjectBuilder().add("files", arrayBuilder).build();
}
}