Extracting zip file containing symbolic links fails with exception in Windows due to insufficient permissions

[maikelsteneker]

(Copied from Stack Overflow)

I'm using the zip4j library to extract a zip file containing symbolic links under Windows.

My code is as follows:

final String path = App.class.getResource("/file.zip").getPath();
final ZipFile zipFile = new ZipFile(path);
final Path tempDirectory = Files.createTempDirectory("tmp");
zipFile.extractAll(tempDirectory.toString());

(Minimal working example is available at https://github.com/maikelsteneker/zip4j-symlink)

This zip file contains a symbolic link. Creating such symbolic links requires Administrator rights in Windows. As a result, the following exception occurs:

Exception in thread "main" net.lingala.zip4j.exception.ZipException: java.nio.file.FileSystemException: C:\Users\Maikel\AppData\Local\Temp\tmp10742489646321434610\symlink.txt: A required privilege is not held by the client.

        at net.lingala.zip4j.tasks.AsyncZipTask.performTaskWithErrorHandling(AsyncZipTask.java:53)
        at net.lingala.zip4j.tasks.AsyncZipTask.execute(AsyncZipTask.java:40)
        at net.lingala.zip4j.ZipFile.extractAll(ZipFile.java:436)
        at zip4j.symlink.App.main(App.java:17)
Caused by: java.nio.file.FileSystemException: C:\Users\Maikel\AppData\Local\Temp\tmp10742489646321434610\symlink.txt: A required privilege is not held by the client.

        at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:92)
        at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
        at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
        at java.base/sun.nio.fs.WindowsFileSystemProvider.createSymbolicLink(WindowsFileSystemProvider.java:585)
        at java.base/java.nio.file.Files.createSymbolicLink(Files.java:1058)
        at net.lingala.zip4j.tasks.AbstractExtractFileTask.createSymLink(AbstractExtractFileTask.java:108)
        at net.lingala.zip4j.tasks.AbstractExtractFileTask.extractFile(AbstractExtractFileTask.java:61)
        at net.lingala.zip4j.tasks.ExtractAllFilesTask.executeTask(ExtractAllFilesTask.java:38)
        at net.lingala.zip4j.tasks.ExtractAllFilesTask.executeTask(ExtractAllFilesTask.java:16)
        at net.lingala.zip4j.tasks.AsyncZipTask.performTaskWithErrorHandling(AsyncZipTask.java:46)
        ... 3 more

I'd like to be able to use a custom error handler in order to ignore errors like this or otherwise exclude symbolic links from being extracted. If more input is necessary, I'd be happy to help. Given some pointers, I'd also be happy to prepare a pull request to enable functionality like this.

[srikanth-lingala]

I will add a feature to exclude symlinks.

[maikelsteneker]

Great, thank you! I'm looking forward to it and would be happy to test or otherwise contribute.

[srikanth-lingala]

Feature is now implemented and I will include this in the next release. To skip extracting symlinks you can now set a flag in UnzipParameters which you can pass to any one of extract*() methods. For example:

UnzipParameters unzipParameters = new UnzipParameters();
unzipParameters.setExtractSymbolicLinks(false);
new ZipFile("test.zip").extractAll("/destinationPath/", unzipParameters);

[srikanth-lingala]

Feature added in v2.7.0 which was released today.

[maikelsteneker]

This works perfectly. Thanks a lot for your efforts!