[com_plugins] User not allowed to core.manage? Use 403 php custom exception (instead of a 404 JError)

[andrepereiradasilva]

Pull Request for Improvement.

Summary of Changes

Replace com_plugins existing 404 JError for a 403 php exception when the user does not have access to "Access Administration Interface" (core.manage).

Also adds a custom exception JControllerExceptionNotallowed for this effect.

Before

After

Testing Instructions

1. Use latest staging
2. Create a user and add it to "Administrator" group
3. Go to com_plugins and set "Access Administration Interface" (core.manage) to "Denied" for "Administrator" group
4. Login with the Administrator user in a private window and go to /administrator/index.php?option=com_plugins
5. See the red message (Before)
6. Apply patch
7. Repeat step 4, you'll see now a 403 error (After).

When/If merged i can do it for the other components.

thanks @mbabker

[alikon]

I have tested this item ✅ successfully on

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[jeckodevelopment]

I have tested this item ✅ successfully on e1253ed

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[MATsxm]

I have tested this item ✅ successfully on e1253ed

Thanks

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[jeckodevelopment]

RTC please

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