Re: GLOBAL_PERMS

2017-12-31 Thread Scot Hacker


On Saturday, December 30, 2017 at 1:32:21 AM UTC-8, Curtis Maloney wrote:
>
>
> So, after a discussion with a new user on #django today I decided to 
> make "permissions not bound to models" a first-class feature. 
>

I'd recommend that anyone working on such a feature take a good look at 
django-rules. It works on a per-app or per-project basis, is not 
necessarily bound to models (but can be), has a good system for detecting 
conflicting rules that might be set in different parts of the codebase, and 
provides some nice helpers for keeping statements and conditions concise. 
Useful both for full-view protection and for in-template fragments. I do 
find the distinction is makes between `make_rule` and `make_perm` somewhat 
arbitrary and confusing, but otherwise they've done great work with it so 
far.

https://github.com/dfunckt/django-rules

./s

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Re: GLOBAL_PERMS

2017-12-30 Thread Curtis Maloney


So, I've taken a different approach, following Markus' idea, and added 
"app_label" to Permission.


I probably still need to add a check to ensure you don't set app_label 
_and_ content_type, but that can wait for now.


You can now define new app-level permissions on the app's 
AppConfig.permissions [optional].


I've also implemented a "create_app_permissions" function which will ... 
do just that.  Call it whenever you like :)


Basic tests are working, as well as added ones.

No documentation or changelog as yet...

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Re: GLOBAL_PERMS

2017-12-30 Thread Curtis Maloney

On 12/31/2017 11:51 AM, Josh Smeaton wrote:


- I dislike the seetings approach of GLOBAL_PERMS and would rather see
   users writing explicit data migrations.


I don't favour either setting or migration based perms, but if you're 
going to go with migration based, then please also consider adding a 
first class permission type, to avoid the ceremony of creating 
forward/back functions, and having to remember the model layout for 
Permissions.


Something like:

migrations.CreatePermission(app_label, permission_name)


Certainly, if we go the data migration path I'd go this way...

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Re: GLOBAL_PERMS

2017-12-30 Thread Curtis Maloney

On 12/31/2017 12:50 AM, Markus Holtermann wrote:

Thanks Curtis,

I had a quick look. Some thoughts (in no particular order):

- IMO a nice idea. I've attached all model independent permissions to
  the user model in the past to work around the limitation.


Certainly a good one I'll remember to mention on #django next time it 
comes up :)



- How do you envision 3rd party apps handling their own permissions? If
  I install 2 independent apps and both use a permission can_do_foo, one
  can't distinguish between those two, right?


I had considered this, and yes would much rather some sort of per-app 
permissions.  For some years now the model-centric view many people take 
of their designs has bothered me.



- What do you think about adding an 'app_label' to the Permission model
  that can be used instead of a content type. That could solve the issue
  from the previous point? content_type and app_label would be
  exclusive?


Oh, absolutely!  A solid mechanism for per-app permissions would win me 
over in a second.


Would we keep the existing syntax of "{scope}.{codename}" and fallback 
scope from model to app label?  Or have a different syntax for app-level 
permissions, like "{app_label}:{codename}"?


And if so, how would that be handled in templates?

Also would we add get_app_permissions() to the auth API?


- I dislike the seetings approach of GLOBAL_PERMS and would rather see
  users writing explicit data migrations.


I was specifically aiming for something almost as simple as the 
per-model custom permissions.


Could we add it to AppConfig?  Feels like the right place to me.

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Re: GLOBAL_PERMS

2017-12-30 Thread Josh Smeaton

>
>
> - I dislike the seetings approach of GLOBAL_PERMS and would rather see 
>   users writing explicit data migrations. 
>

I don't favour either setting or migration based perms, but if you're going 
to go with migration based, then please also consider adding a first class 
permission type, to avoid the ceremony of creating forward/back functions, 
and having to remember the model layout for Permissions.

Something like:

migrations.CreatePermission(app_label, permission_name)

or django.contrib.auth.CreatePermission (which is actually an Operation) if 
we want to avoid contrib polluting migrations proper. 

I haven't fully thought through the implications, but every time I need to 
write a data migration I spend more time than I'd like to admit searching 
for a previous data migration from which to copy.

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Re: GLOBAL_PERMS

2017-12-30 Thread Markus Holtermann

Thanks Curtis,

I had a quick look. Some thoughts (in no particular order):

- IMO a nice idea. I've attached all model independent permissions to
 the user model in the past to work around the limitation.

- How do you envision 3rd party apps handling their own permissions? If
 I install 2 independent apps and both use a permission can_do_foo, one
 can't distinguish between those two, right?

- What do you think about adding an 'app_label' to the Permission model
 that can be used instead of a content type. That could solve the issue
 from the previous point? content_type and app_label would be
 exclusive?

- I dislike the seetings approach of GLOBAL_PERMS and would rather see
 users writing explicit data migrations.

/Markus

On Sat, Dec 30, 2017 at 08:31:57PM +1100, Curtis Maloney wrote:


So, after a discussion with a new user on #django today I decided to 
make "permissions not bound to models" a first-class feature.


So I've written a simple patch that is in 
https://github.com/django/django/compare/master...funkybob:feature/cjm/global_perms?expand=1

Basically:

1. Allow Permission.content_type to be null

2. Adjust everything else to cope with that

3. Add new setting "GLOBAL_PERMS"

4. Teach create_permissions to honor that.

5. Write minimal test and documentation.

Would welcome further input.

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GLOBAL_PERMS

2017-12-30 Thread Curtis Maloney


So, after a discussion with a new user on #django today I decided to 
make "permissions not bound to models" a first-class feature.


So I've written a simple patch that is in 
https://github.com/django/django/compare/master...funkybob:feature/cjm/global_perms?expand=1


Basically:

1. Allow Permission.content_type to be null

2. Adjust everything else to cope with that

3. Add new setting "GLOBAL_PERMS"

4. Teach create_permissions to honor that.

5. Write minimal test and documentation.

Would welcome further input.

--
C

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