KaraDAV - A lightweight WebDAV server, with NextCloud compatibility

This is a simple and lighweight WebDAV server, allowing to easily set up a file sharing server compatible with WebDAV and NextCloud clients. It has no dependencies and good performance.

It is written in PHP (8+). The only dependency is SQLite3 for the database.

Its original purpose was to serve as a demo and test for the KD2 WebDAV library, which we developed for Paheko, our non-profit management solution, but it can also be used as a simple but powerful file sharing server.

Features

• User-friendly directory listings for file browsing with a web browser, using our WebDAV Manager.js client
  • Upload directly from browser, using paste or drag and drop
  • Rename
  • Delete
  • Create and edit text files
  • Create directories
  • MarkDown live preview
  • Preview of images, text, MarkDown and PDF
  • Editing of Office files using Collabora or OnlyOffice
• WebDAV class 1, 2, 3 support, support for Etags
• No database server is required (SQLite3 is used)
• Multiple user accounts
• Support for per-user quota
• Share files using WebDAV: delete, create, update, mkdir, get, list
• Compatible with WebDAV clients
• Support for HTTP ranges (partial download of files)
• Support for RFC 3230 to get the MD5 digest hash of a file (to check integrity) on HEAD requests (only MD5 is supported so far)
• Support for Content-MD5 with PUT requests, see dCache documentation for details
• Support for some of the Microsoft proprietary properties
• Passes most of the Litmus compliance tests (see below)
• Supports WOPI, for editing and viewing of documents using OnlyOffice, Collabora Online or MS Office.
• Support for LDAP
• Good performance!

NextCloud/ownCloud features

KaraDAV is compatible with ownCloud and NextCloud clients, because on Android there is not much nice WebDAV clients, and on desktop their clients allow for two-way sync, which no other WebDAV client provides.

The following ownCloud/NextCloud specific features are supported:

• Direct download
• Chunk upload
• X-OC-MTime header to set file modification time
• Login via app-specific passwords (necessary for NextCloud desktop and Android clients)
• Thumbnail/preview of images and files
• Workspace notes (README.md displayed on top of directory listing on Android app) and workspace notes editing

Screenshots

Files management using the Web UI

Login from NextCloud client

NextCloud/ownCloud compatibility

This server should be compatible with ownCloud and NextCloud synchronization clients (desktop, mobile, CLI).

It has been tested with:

• ownCloud Desktop 2.5.1 and 2.11.1 (Debian)
• NextCloud Desktop 3.1.1 and 3.6.0 (Debian)
• NextCloud Android app 3.21.0 (F-Droid)
• ownCloud Android app 2.21.2 (F-Droid)
• NextCloud CLI client 3.1.1 (Debian) -- Note: make sure to pass options before parameters.

We recommend the ownCloud apps, as they are more stable and lighter :)

Note that even though it has been tested with NC/OC clients, KaraDAV might stop working at any time with these clients.

WebDAV clients compatibility

Here is a list of clients tested with KaraDAV:

Desktop

• FUSE webdavfs is recommended for Linux
• davfs2 is NOT recommended: it is very slow, and it is using a local cache, meaning changing a file locally may not be synced to the server for a few minutes, leading to things getting out of sync. If you have to use it, at least disable locks, by setting use_locks=0 in the config.
• Microsoft Windows native webclient (also called 'MiniRedir') is notoriously bad. We tested it successfully on Windows 10, but it is recommended to use CyberDuck or WinSCP instead, both are free software.
• Dolphin (KDE)
• Thunar (GTK/GNOME)
• rclone on Linux

Android

• Recommended RCX
• DAVx⁵, see the manual for how to set up a WebDAV mount
• X-Plore

WOPI clients compatibility

• Tested successfully with Collabora Development Edition (see COLLABORA.md)

Future development

This might get supported in future (maybe):

• Probably: NextCloud Trashbin
• Maybe: NextCloud sharing
• Maybe: NextCloud files versioning (see API, versioning pattern, code)

This probably won't get supported anytime soon:

• CalDAV/CardDAV support:
  • this would require a bunch of new stuff implemented
  • the only CalDAV test suite (CavDAVtester) does not work anymore as it's written for Python 2
  • for now the best option is to use Baikal from Sabre/DAV for that
  • Nice web clients to add to Baikal are AgenDAV and InfCloud
• Extended MKCOL required only if CalDAV support is implemented
• Partial upload via PATCH
• Resumable upload via TUS
• WebDAV sharing if it ever becomes a spec?

Install instructions

See specific install documentation.

Dependencies

This depends on the KD2\WebDAV and KD2\WebDAV_NextCloud classes from the KD2FW package, which are packaged in this repository.

They are lightweight and easy to use in your own software to add support for WebDAV and NextCloud clients to your software. Contact us for a commercial license.

Similar software

• Davros used to be compatible with NextCloud client before version 2.5.0
• FileRun is a proprietary solution compatible with the NextCloud Android app

Might also be useful:

• DrivinCloudOpen is a defunct open-source Android WebDAV client that is easy to use

Performance

I created 300 small random files, totalling 5.5 MB.

Then I timed KaraDAV, mod_dav and NextCloud (24) (all installed on my laptop, with Apache 2.4) with various WebDAV clients doing those tasks:

• Copy 300 small files to the WebDAV share
• Refresh the directory (press F5)
• Delete all 300 selected files

KaraDAV performance was very close to mod_dav, and NextCloud performance was incredibly poor.

Client	KaraDAV	NextCloud	mod_dav
Dolphin (KDE)	5 seconds	1 minute 15 seconds	3 seconds
Thunar (GTK)	5 seconds	1 minute 50 seconds	5 seconds
WebDAV Manager.js	4 seconds (no delete)	--	--

At the time of this test, WebDAV Manager.js didn't have the ability to select and delete multiple files at once, so the time shown is only for copy and refresh.

Litmus compliance tests

Tests were performed using litmus source code as of December 13, 2017 from the Github repo.

We are not aiming at 100% pass, as we are mainly targeting file sharing, so we are not currently trying to fix rare PROPPATCH issues, but pull requests are welcome.

-> running `http':
 0. init.................. pass
 1. begin................. pass
 2. expect100............. pass
 3. finish................ pass
<- summary for `http': of 4 tests run: 4 passed, 0 failed. 100.0%

-> running `basic':
 0. init.................. pass
 1. begin................. pass
 2. options............... pass
 3. put_get............... pass
 4. put_get_utf8_segment.. pass
 5. mkcol_over_plain...... pass
 6. delete................ pass
 7. delete_null........... pass
 8. delete_fragment....... pass
 9. mkcol................. pass
10. mkcol_percent_encoded. pass
11. mkcol_again........... pass
12. delete_coll........... pass
13. mkcol_no_parent....... pass
14. mkcol_with_body....... pass
15. mkcol_forbidden....... pass
16. chk_ETag.............. pass
17. finish................ pass
<- summary for `basic': of 18 tests run: 18 passed, 0 failed. 100.0%

-> running `copymove':
 0. init.................. pass
 1. begin................. pass
 2. copy_init............. pass
 3. copy_simple........... pass
 4. copy_overwrite........ pass
 5. copy_nodestcoll....... pass
 6. copy_cleanup.......... pass
 7. copy_content_check.... pass
 8. copy_coll_depth....... pass
 9. copy_coll............. pass
10. depth_zero_copy....... pass
11. copy_med_on_coll...... pass
12. move.................. pass
13. move_coll............. pass
14. move_cleanup.......... pass
15. move_content_check.... pass
16. move_collection_check. pass
17. finish................ pass
<- summary for `copymove': of 18 tests run: 18 passed, 0 failed. 100.0%

With this litmus version, props and locks tests currently fail.

But they mostly pass with litmus 0.13-3 supplied by Debian:

-> running `props':
 0. init.................. pass
 1. begin................. pass
 2. propfind_invalid...... pass
 3. propfind_invalid2..... pass
 4. propfind_d0........... pass
 5. propinit.............. pass
 6. propset............... pass
 7. propget............... pass
 8. propextended.......... pass
 9. propmove.............. pass
10. propget............... pass
11. propdeletes........... pass
12. propget............... pass
13. propreplace........... pass
14. propget............... pass
15. propnullns............ pass
16. propget............... pass
17. prophighunicode....... pass
18. propget............... pass
19. propremoveset......... pass
20. propget............... pass
21. propsetremove......... pass
22. propget............... pass
23. propvalnspace......... pass
24. propwformed........... pass
25. propinit.............. pass
26. propmanyns............ pass
27. propget............... pass
28. propcleanup........... pass
29. finish................ pass
<- summary for `props': of 30 tests run: 30 passed, 0 failed. 100.0%

-> running `locks':
 0. init.................. pass
 1. begin................. pass
 2. options............... pass
 3. precond............... pass
 4. init_locks............ pass
 5. put................... pass
 6. lock_excl............. pass
 7. discover.............. pass
 8. refresh............... pass
 9. notowner_modify....... pass
10. notowner_lock......... pass
11. owner_modify.......... pass
12. notowner_modify....... pass
13. notowner_lock......... pass
14. copy.................. pass
15. cond_put.............. pass
16. fail_cond_put......... pass
17. cond_put_with_not..... pass
18. cond_put_corrupt_token WARNING: PUT failed with 400 not 423
    ...................... pass (with 1 warning)
19. complex_cond_put...... pass
20. fail_complex_cond_put. pass
21. unlock................ pass
22. fail_cond_put_unlocked pass
23. lock_shared........... pass
24. notowner_modify....... pass
25. notowner_lock......... FAIL (LOCK on locked resource)
26. owner_modify.......... pass
27. double_sharedlock..... FAIL (shared LOCK on locked resource:
423 Locked)
28. notowner_modify....... pass
29. notowner_lock......... pass
30. unlock................ pass
31. prep_collection....... pass
32. lock_collection....... pass
33. owner_modify.......... FAIL (PROPPATCH on locked resouce on `/files/demo/litmus/lockcoll/lockme.txt': 423 Locked)
34. notowner_modify....... pass
35. refresh............... pass
36. indirect_refresh...... pass
37. unlock................ pass
38. unmapped_lock......... WARNING: LOCK on unmapped url returned 200 not 201 (RFC4918:S7.3)
    ...................... pass (with 1 warning)
39. unlock................ pass
40. finish................ pass
<- summary for `locks': of 41 tests run: 38 passed, 3 failed. 92.7%
-> 2 warnings were issued.

Author

Paheko.cloud / BohwaZ. Contact me on: IRC = bohwaz@irc.libera.chat / Mastodon = https://mamot.fr/@bohwaz / Twitter = @bohwaz

Contributors

Thank you:

• Cédric Picard, for the security report

## License

This software and its dependencies are available in open source with the AGPL v3 license. This requires you to share all your source code if you include this in your software. This is voluntary.

For entities wishing to use this software or libraries in a project where you don't want to have to publish all your source code, we can also sell this software with a commercial license, contact me at bohwaz /at/ kd2 /dot/ org. We can do that as we have wrote and own 100% of the source code, dependencies included, there is no third-party code here.