Permission pipe

[Nosfistis]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[x] Feature request
[ ] Documentation issue or request

While the directive usage is fine, sometimes it's useful having attributes based on permissions. For example, disabling a link cannot be done using directives. A better option would be an impure pipe permission,, returning true/false like so:

<button [disabled]="'changeSomethingPermission' | ngxPermission">Change</button>

I understand this might not be the most elegant design, but it would fit easily to any attribute, even component input ones.

[AlexKhymenko]

@Nosfistis This is great idea the pipe will only return true or false.. In this case problem with angular material would be fixed. But i actually need to find time for this. Probably after New Year :-)

[Nosfistis]

Great! If you need any help I can prep a PR.

[AlexKhymenko]

@Nosfistis If You have PR please submit it :-)

[AlexKhymenko]

@Nosfistis I actually started figuring out. But i have some problems with API. How You want to use it.
For example i can create 2 pipes. ngxPermissionsOnly and ngxPermissionsExcept. But then i can't use them together.

[Nosfistis]

I don't really see a case where both are needed. In the original directives, I also find the case of both [ngxPermissionsExcept]="['ADMIN', 'JOHNY']" and [ngxPermissionsOnly]="['MANAGER']" weird; doesn't it mean only 'MANAGER' can view that div?

If need be, one can combine the 2 pipes using:

<button [disabled]="('changeSomethingPermission' | ngxPermissionOnly) && ('changeSomethingElsePermission' | ngxPermissionExcept)">Change</button>

Then there is another idea of having the permissions as pipe argument:

<button [disabled]="permissionService.permissions$ | async | ngxPermission:'changeSomethingPermission'">Change</button>

[tplk]

@AlexKhymenko hello, can you share your WIP version for now, please?

[AlexKhymenko]

@tplk it was on old computer. Now its lost forever :-(

[denes16]

Any news on this?.
I can create a pr, but please let me know where i have to start.