Django user permissions in your templates

Nov 30, 2014Download as pptx, pdf2 likes6,701 views

Use Djangos custom template tags to create beatiful code to check for permissions (and other stuff) in your Django templates.

Django
user permissions
in your templates
A nice little Django template tag pattern

The task
On the frontend
display an “edit” link
for the owner of an object and
for super users.

$Version A {% if user.is_authenticated %} {% if user.is_superuser %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% else %} {% if my_obj.user == user %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %} {% endif %} {% endif %}$

$Version B {% if user.is_authenticated and my_obj.user == user or user.is_superuser %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %}$

$Version C {% if user|can_edit:my_obj %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %}$

$Version C {% if user|can_edit:my_obj %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %} Way better!$

$Version C: {% if user|can_edit:my_obj %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %}$

The custom template tag
from django import template
register = template.Library()
@register.filter
def can_edit(user, obj):
user_can_edit = False
if user.is_authenticated:
if user.is_superuser:
user_can_edit = True
else:
if obj and obj.user and obj.user == user:
user_can_edit = True
return user_can_edit

$More applications for this pattern {% if user|can_delete:my_object %} {% if user|is_in_group:group %} {% if event|is_attended_by:user %} {% if user|has_been_at:place %} {% if place|is_in_favorites_of:user %} {% if article|has_been_flagged_by:user %}$

Thank you for listening!
Anton Pirker
anton@ignaz.at
@antonpirker
Slides
slideshare.net/apirker
Blog post
http://www.anton-pirker.at/django-user-permissions-in-your-
templates/

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Django user permissions in your templates

1. Django user permissions in your templates A nice little Django template tag pattern

2. The task On the frontend display an “edit” link for the owner of an object and for super users.

3. Version A {% if user.is_authenticated %} {% if user.is_superuser %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% else %} {% if my_obj.user == user %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %} {% endif %} {% endif %}

4. Version A {% if user.is_authenticated %} {% if user.is_superuser %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% else %} {% if my_obj.user == user %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %} {% endif %} {% endif %}

5. Version B {% if user.is_authenticated and my_obj.user == user or user.is_superuser %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %}

6. Version B {% if user.is_authenticated and my_obj.user == user or user.is_superuser %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %}

7. Version C {% if user|can_edit:my_obj %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %}

8. Version C {% if user|can_edit:my_obj %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %} Way better!

9. Version C: {% if user|can_edit:my_obj %} <a href="{% url 'my_obj:edit' my_obj.id %}"> Edit object </a> {% endif %}

10. The custom template tag from django import template register = template.Library() @register.filter def can_edit(user, obj): user_can_edit = False if user.is_authenticated: if user.is_superuser: user_can_edit = True else: if obj and obj.user and obj.user == user: user_can_edit = True return user_can_edit

11. More applications for this pattern {% if user|can_delete:my_object %} {% if user|is_in_group:group %} {% if event|is_attended_by:user %} {% if user|has_been_at:place %} {% if place|is_in_favorites_of:user %} {% if article|has_been_flagged_by:user %}

12. Thank you for listening! Anton Pirker anton@ignaz.at @antonpirker Slides slideshare.net/apirker Blog post http://www.anton-pirker.at/django-user-permissions-in-your- templates/

Django user permissions in your templates

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