External plugins stopped working

[appa1303]

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Describe the bug
On old versions (e.g. 20.8.16) running DrawIO desktop on windows with the --enable-plugins option, allowed me to load external plugin. In version 21.5.0 this no longer works.
To verify I tried to load the numbers.js plugin from ...\drawio-21.5.0\src\main\webapp\plugins as an external plugin and it will not work, using the internal version of the plugin works fine.

To Reproduce
Steps to reproduce the behavior:

1. start DrawIO desktop on windows from commandline: C:\Program Files\draw.io>draw.io.exe --enable-plugins
2. Goto extras => Plugin => Add, and add external plugin
3. Restart drawIO
4. The plug in is not working
5. Download the drawIO source from git, locate the numbers.js plugin and install it as external plugin
6. The numbers.js plugin is not working

Expected behavior
External plugins should have loaded when running drawio desktop with --enable-plugins

Screenshots
If applicable, add screenshots to help explain your problem.

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version 21.5.0

Desktop (please complete the following information):
os: Windows 11

Additional context
The plugin I am trying to use worked at least up to version 20.8.16, Since i can't load Numbers.JS also i think it is a problem in drawio desktop

[davidjgraph]

Unfortunately, this is a side effect of security measures we have added to the app. The measures are very important, so the plugin functionality will have to longer be a part of the desktop app.

[appa1303]

Thank you for the quick reply,

Since the plugin is a must for us, is it possible for us to rebuild DrawIO desktop without the new security measures ?
Can you please direct us to instruction for the building process ?

[davidjgraph]

You can run it up locally using the instructions in the main README.

[davidjgraph]

We'll have a better review to see if this is possible to restore.

[davidjgraph]

Intended fix in 21.5.1