io.joshworks.snappy.loader.jar.JarURLConnection Maven / Gradle / Ivy
/*
* Copyright 2012-2016 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 io.joshworks.snappy.loader.jar;
import io.joshworks.snappy.loader.util.AsciiBytes;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FilePermission;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.security.Permission;
import java.util.jar.Manifest;
/**
* {@link java.net.JarURLConnection} used to support {@link JarFile#getUrl()}.
*
* @author Phillip Webb
* @author Andy Wilkinson
*/
class JarURLConnection extends java.net.JarURLConnection {
private static final FileNotFoundException FILE_NOT_FOUND_EXCEPTION = new FileNotFoundException();
private static final String SEPARATOR = "!/";
private static final URL EMPTY_JAR_URL;
private static final JarEntryName EMPTY_JAR_ENTRY_NAME = new JarEntryName("");
private static final String FILE_COLON_DOUBLE_SLASH = "file://";
private static final String READ_ACTION = "read";
private static ThreadLocal useFastExceptions = new ThreadLocal();
static {
try {
EMPTY_JAR_URL = new URL("jar:", null, 0, "file:!/", new URLStreamHandler() {
@Override
protected URLConnection openConnection(URL u) throws IOException {
// Stub URLStreamHandler to prevent the wrong JAR Handler from being
// Instantiated and cached.
return null;
}
});
} catch (MalformedURLException ex) {
throw new IllegalStateException(ex);
}
}
private final JarFile jarFile;
private Permission permission;
private JarEntryData jarEntryData;
private URL jarFileUrl;
private JarEntryName jarEntryName;
protected JarURLConnection(URL url, JarFile jarFile) throws IOException {
// What we pass to super is ultimately ignored
super(EMPTY_JAR_URL);
this.url = url;
String spec = getNormalizedFile(url)
.substring(jarFile.getUrl().getFile().length());
int separator;
while ((separator = spec.indexOf(SEPARATOR)) > 0) {
jarFile = getNestedJarFile(jarFile, spec.substring(0, separator));
spec = spec.substring(separator + SEPARATOR.length());
}
this.jarFile = jarFile;
this.jarEntryName = getJarEntryName(spec);
}
static void setUseFastExceptions(boolean useFastExceptions) {
JarURLConnection.useFastExceptions.set(useFastExceptions);
}
private String getNormalizedFile(URL url) {
if (!url.getFile().startsWith(FILE_COLON_DOUBLE_SLASH)) {
return url.getFile();
}
return "file:" + url.getFile().substring(FILE_COLON_DOUBLE_SLASH.length());
}
private JarFile getNestedJarFile(JarFile jarFile, String name) throws IOException {
JarEntry jarEntry = jarFile.getJarEntry(name);
if (jarEntry == null) {
throwFileNotFound(jarEntry, jarFile);
}
return jarFile.getNestedJarFile(jarEntry);
}
private JarEntryName getJarEntryName(String spec) {
if (spec.length() == 0) {
return EMPTY_JAR_ENTRY_NAME;
}
return new JarEntryName(spec);
}
@Override
public void connect() throws IOException {
if (!this.jarEntryName.isEmpty()) {
this.jarEntryData = this.jarFile
.getJarEntryData(this.jarEntryName.asAsciiBytes());
if (this.jarEntryData == null) {
throwFileNotFound(this.jarEntryName, this.jarFile);
}
}
this.connected = true;
}
private void throwFileNotFound(Object entry, JarFile jarFile)
throws FileNotFoundException {
if (Boolean.TRUE.equals(useFastExceptions.get())) {
throw FILE_NOT_FOUND_EXCEPTION;
}
throw new FileNotFoundException(
"JAR entry " + entry + " not found in " + jarFile.getName());
}
@Override
public Manifest getManifest() throws IOException {
try {
return super.getManifest();
} finally {
this.connected = false;
}
}
@Override
public JarFile getJarFile() throws IOException {
connect();
return this.jarFile;
}
@Override
public URL getJarFileURL() {
if (this.jarFileUrl == null) {
this.jarFileUrl = buildJarFileUrl();
}
return this.jarFileUrl;
}
private URL buildJarFileUrl() {
try {
String spec = this.jarFile.getUrl().getFile();
if (spec.endsWith(SEPARATOR)) {
spec = spec.substring(0, spec.length() - SEPARATOR.length());
}
if (spec.indexOf(SEPARATOR) == -1) {
return new URL(spec);
}
return new URL("jar:" + spec);
} catch (MalformedURLException ex) {
throw new IllegalStateException(ex);
}
}
@Override
public JarEntry getJarEntry() throws IOException {
connect();
return (this.jarEntryData == null ? null : this.jarEntryData.asJarEntry());
}
@Override
public String getEntryName() {
return this.jarEntryName.toString();
}
@Override
public InputStream getInputStream() throws IOException {
connect();
if (this.jarEntryName.isEmpty()) {
throw new IOException("no entry name specified");
}
return this.jarEntryData.getInputStream();
}
@Override
public int getContentLength() {
try {
connect();
if (this.jarEntryData != null) {
return this.jarEntryData.getSize();
}
return this.jarFile.size();
} catch (IOException ex) {
return -1;
}
}
@Override
public Object getContent() throws IOException {
connect();
return (this.jarEntryData == null ? this.jarFile : super.getContent());
}
@Override
public String getContentType() {
return this.jarEntryName.getContentType();
}
@Override
public Permission getPermission() throws IOException {
if (this.permission == null) {
this.permission = new FilePermission(
this.jarFile.getRootJarFile().getFile().getPath(), READ_ACTION);
}
return this.permission;
}
/**
* A JarEntryName parsed from a URL String.
*/
private static class JarEntryName {
private final AsciiBytes name;
private String contentType;
JarEntryName(String spec) {
this.name = decode(spec);
}
private AsciiBytes decode(String source) {
int length = (source == null ? 0 : source.length());
if ((length == 0) || (source.indexOf('%') < 0)) {
return new AsciiBytes(source);
}
ByteArrayOutputStream bos = new ByteArrayOutputStream(length);
for (int i = 0; i < length; i++) {
int ch = source.charAt(i);
if (ch == '%') {
if ((i + 2) >= length) {
throw new IllegalArgumentException("Invalid encoded sequence \""
+ source.substring(i) + "\"");
}
ch = decodeEscapeSequence(source, i);
i += 2;
}
bos.write(ch);
}
// AsciiBytes is what is used to store the JarEntries so make it symmetric
return new AsciiBytes(bos.toByteArray());
}
private char decodeEscapeSequence(String source, int i) {
int hi = Character.digit(source.charAt(i + 1), 16);
int lo = Character.digit(source.charAt(i + 2), 16);
if (hi == -1 || lo == -1) {
throw new IllegalArgumentException(
"Invalid encoded sequence \"" + source.substring(i) + "\"");
}
return ((char) ((hi << 4) + lo));
}
@Override
public String toString() {
return this.name.toString();
}
public AsciiBytes asAsciiBytes() {
return this.name;
}
public boolean isEmpty() {
return this.name.length() == 0;
}
public String getContentType() {
if (this.contentType == null) {
this.contentType = deduceContentType();
}
return this.contentType;
}
private String deduceContentType() {
// Guess the content type, don't bother with streams as mark is not supported
String type = (isEmpty() ? "x-java/jar" : null);
type = (type != null ? type : guessContentTypeFromName(toString()));
type = (type != null ? type : "content/unknown");
return type;
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy