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Description:

djangohostuseroverride 0.4.5

django-host-user-override
Overrides current user based on host prefix. For example any request to
5.user.example.com (format can be changed in settings) becomes
request as if you were logged in as user with ID 5. This allows you
to be logged in as different users in different tabs
at the same time without losing your primary authenticated user.
Works only if you're logged in as superuser by default (can be
changed in settings).
Also gives you big red banner on top of every page if your user is
overridden.
Requirements

Your DNS server should resolve subdomains *.user.<your domain>
to the same IP address as main domain.
Your project should not use absolute link generation or any other
technic that can change current subdomain. It is a more inconvenience
than requirement though.

Installing django-host-user-override

Install the package from PyPI: pip install django-host-user-override

Add host_user_override to INSTALLED_APPS:

INSTALLED_APPS = [
...,
'host_user_override',
...,
]

Add HostUserOverrideMiddleware right after AuthenticationMiddleware:

MIDDLEWARE = [
...,
'django.contrib.auth.middleware.AuthenticationMiddleware',
'host_user_override.middleware.HostUserOverrideMiddleware',
...,
]

Update your settings.py file to support subdomains (don't forget about DNS as well):

ALLOWED_HOSTS = ['.example.com']

SESSION_COOKIE_DOMAIN = '.example.com'

Set new change_form.html template in UserAdmin:

admin.site.unregister(User)

@admin.register(User)
class CustomUserAdmin(UserAdmin):
change_form_template = 'host_user_override/change_form.html'

Optional settings

Update settings.py if you want host pattern other than <id>.user.<domain>. Example for u<id>.<domain>:

HOSTUSEROVERRIDE_HOST_REGEXP = r'u(\d+)\..+'

HOSTUSEROVERRIDE_HOST_SUB_REGEXP = r'u\d+\.'

HOSTUSEROVERRIDE_REDIRECT_URL_FORMAT = 'http://u{user_id}.{host}/'

HOSTUSEROVERRIDE_PERMANENT_REDIRECT = False

Set HOSTUSEROVERRIDE_PERMISSION_CHECK to customize required
permissions. Should be function that takes 2 positional arguments:
current user and desired user.

Set HOSTUSEROVERRIDE_FORCE_ACTIVE to force overriden user to be active even when he is actually disabled.

Usage
Open any non-superuser in Django Admin and press 'Login as multiuser' button.
License
This project is licensed under the MIT License - see the LICENSE file for details.
Acknowledgments

Props to django-debug-toolbar team for HTML injection code
Thanks to @dimoha for original idea