jruby/core/src/main/java/org/jruby/util/JarResource.java at master · jruby/jruby · GitHub

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package org.jruby.util;

import jnr.posix.FileStat;

import java.io.IOException;

import java.net.URLDecoder;

import java.nio.charset.StandardCharsets;

import java.nio.file.attribute.FileTime;

import java.util.jar.JarEntry;

abstract class JarResource implements FileResource, DummyResourceStat.FileResourceExt {

private static final JarCache jarCache = new JarCache();

public static JarResource create(String pathname) {

int bang = pathname.indexOf('!');

if (bang == -1) return null; // no ! no jar!

if (pathname.startsWith("jar:")) {

if (pathname.startsWith("file:", 4)) {

pathname = pathname.substring(9); bang -= 9; // 4 + 5

}

else {

pathname = pathname.substring(4); bang -= 4;

}

else if (pathname.startsWith("file:")) {

pathname = pathname.substring(5); bang -= 5;

}

String jarPath = pathname.substring(0, bang);

String entryPath = pathname.substring(bang + 1);

// normalize path -- issue #2017

if (StringSupport.startsWith(entryPath, '/', '/')) entryPath = entryPath.substring(1);

// special case: "jar:file:blah.jar!." is just "jar:file:blah.jar!"

if (entryPath.equals(".")) entryPath = "";

// TODO: Do we really need to support both test.jar!foo/bar.rb and test.jar!/foo/bar.rb cases?

JarResource resource = createJarResource(jarPath, entryPath, false);

if (resource == null && StringSupport.startsWith(entryPath, '/')) {

resource = createJarResource(jarPath, entryPath.substring(1), true);

}

return resource;

}

private static JarResource createJarResource(String jarPath, String entryPath, boolean rootSlashPrefix) {

JarCache.JarIndex index = jarCache.getIndex(jarPath);

if (index == null) { // Jar doesn't exist

try {

jarPath = URLDecoder.decode(jarPath, StandardCharsets.UTF_8);

entryPath = URLDecoder.decode(entryPath, StandardCharsets.UTF_8);

}

catch (IllegalArgumentException e) {

// something in the path did not decode, so it's probably not a URI

// See jruby/jruby#2264.

return null;

}

index = jarCache.getIndex(jarPath);

if (index == null) return null; // Jar doesn't exist

}

// Try it as directory first, because jars tend to have foo/ entries

// and it's not really possible disambiguate between files and directories.

String[] entries = index.getDirEntries(entryPath);

if (entries != null) {

return new JarDirectoryResource(jarPath, rootSlashPrefix, entryPath, entries);

}

if (entryPath.length() > 1 && entryPath.endsWith("/")) { // in case 'foo/' passed

entries = index.getDirEntries(entryPath.substring(0, entryPath.length() - 1));

if (entries != null) {

return new JarDirectoryResource(jarPath, rootSlashPrefix, entryPath, entries);

}

JarEntry jarEntry = index.getJarEntry(entryPath);

if (jarEntry != null) {

return new JarFileResource(jarPath, rootSlashPrefix, index, jarEntry);

}

return null;

}

public static void removeJarResource(String jarPath){

jarCache.remove(jarPath);

}

private final CharSequence jarPrefix;

JarResource(String jarPath, boolean rootSlashPrefix) {

StringBuilder prefix = new StringBuilder(jarPath.length() + 2);

prefix.append(jarPath).append('!');

this.jarPrefix = rootSlashPrefix ? prefix.append('/') : prefix;

}

private transient String absolutePath;

@Override

public final String absolutePath() {

String path = this.absolutePath;

if (path != null) return path;

return this.absolutePath = jarPrefix + entryName();

}

@Override

public String canonicalPath() {

return absolutePath();

}

@Override

public String path() {

return absolutePath();

}

@Override

public boolean exists() {

// If a jar resource got created, then it always corresponds to some kind of resource

return true;

}

@Override

public boolean canRead() {

// Can always read from a jar

return true;

}

@Override

public boolean canWrite() {

return false;

}

@Override

public boolean canExecute() {

return false;

}

@Override

public boolean isSymLink() {

// Jar archives shouldn't contain symbolic links, or it would break portability. `jar`

// command behavior seems to comform to that (it unwraps syumbolic links when creating a jar

// and replaces symbolic links with regular file when extracting from a zip that contains

// symbolic links). Also see:

// http://www.linuxquestions.org/questions/linux-general-1/how-to-create-jar-files-with-symbolic-links-639381/

return false;

}

private transient FileStat fileStat;

@Override

public FileStat stat() {

FileStat fileStat = this.fileStat;

if (fileStat != null) return fileStat;

return this.fileStat = new DummyResourceStat(this);

}

@Override

public FileStat lstat() {

return stat(); // jars don't have symbolic links, so lstat == stat

}

@Override

public int errno() {

return 0; // stat() never fails

}

@Override

public boolean isNull() {

return false;

}

public abstract FileTime creationTime() throws IOException;

public abstract FileTime lastAccessTime() throws IOException;

public abstract FileTime lastModifiedTime() throws IOException;

@Override

public long lastModified() {

FileTime mod = null;

try {

mod = lastModifiedTime();

}

catch (IOException ex) { /* -1 invalid? */ }

return mod == null ? 0L : mod.toMillis();

}

abstract String entryName();

@Override

public String toString() {

return getClass().getName() + '{' + absolutePath() + '}';

}

@Override

public boolean equals(Object obj) {

if (obj instanceof JarResource) {

JarResource that = (JarResource) obj;

return this.absolutePath().equals(that.absolutePath());

}

return false;

}

@Override

public int hashCode() {

return 11 * entryName().hashCode();

}

jruby/core/src/main/java/org/jruby/util/JarResource.java at master · jruby/jruby · GitHub

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jruby/core/src/main/java/org/jruby/util/JarResource.java at master · jruby/jruby · GitHub

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