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/*
* Copyright 2015 Google Inc.
*
* 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.google.common.jimfs;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.base.Ascii;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileTime;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
/**
* {@code URLConnection} implementation.
*
* @author Colin Decker
*/
final class PathURLConnection extends URLConnection {
/*
* This implementation should be able to work for any proper file system implementation... it
* might be useful to release it and make it usable by other file systems.
*/
private static final String HTTP_DATE_FORMAT = "EEE, dd MMM yyyy HH:mm:ss \'GMT\'";
private static final String DEFAULT_CONTENT_TYPE = "application/octet-stream";
private InputStream stream;
private ImmutableListMultimap<String, String> headers = ImmutableListMultimap.of();
PathURLConnection(URL url) {
super(checkNotNull(url));
}
@Override
public void connect() throws IOException {
if (stream != null) {
return;
}
Path path = Paths.get(toUri(url));
long length;
if (Files.isDirectory(path)) {
// Match File URL behavior for directories by having the stream contain the filenames in
// the directory separated by newlines.
StringBuilder builder = new StringBuilder();
try (DirectoryStream<Path> files = Files.newDirectoryStream(path)) {
for (Path file : files) {
builder.append(file.getFileName()).append('\n');
}
}
byte[] bytes = builder.toString().getBytes(UTF_8);
stream = new ByteArrayInputStream(bytes);
length = bytes.length;
} else {
stream = Files.newInputStream(path);
length = Files.size(path);
}
FileTime lastModified = Files.getLastModifiedTime(path);
String contentType =
MoreObjects.firstNonNull(Files.probeContentType(path), DEFAULT_CONTENT_TYPE);
ImmutableListMultimap.Builder<String, String> builder = ImmutableListMultimap.builder();
builder.put("content-length", "" + length);
builder.put("content-type", contentType);
if (lastModified != null) {
DateFormat format = new SimpleDateFormat(HTTP_DATE_FORMAT, Locale.US);
format.setTimeZone(TimeZone.getTimeZone("GMT"));
builder.put("last-modified", format.format(new Date(lastModified.toMillis())));
}
headers = builder.build();
}
private static URI toUri(URL url) throws IOException {
try {
return url.toURI();
} catch (URISyntaxException e) {
throw new IOException("URL " + url + " cannot be converted to a URI", e);
}
}
@Override
public InputStream getInputStream() throws IOException {
connect();
return stream;
}
@SuppressWarnings("unchecked") // safe by specification of ListMultimap.asMap()
@Override
public Map<String, List<String>> getHeaderFields() {
try {
connect();
} catch (IOException e) {
return ImmutableMap.of();
}
return (ImmutableMap<String, List<String>>) (ImmutableMap<String, ?>) headers.asMap();
}
@Override
public String getHeaderField(String name) {
try {
connect();
} catch (IOException e) {
return null;
}
// no header should have more than one value
return Iterables.getFirst(headers.get(Ascii.toLowerCase(name)), null);
}
}
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