def activate(request, activation_key,
template_name='registration/activate.html',
extra_context=None):
"""
Activate a ``User``'s account from an activation key, if their key
is valid and hasn't expired.
By default, use the template ``registration/activate.html``; to
change this, pass the name of a template as the keyword argument
``template_name``.
**Required arguments**
``activation_key``
The activation key to validate and use for activating the
``User``.
**Optional arguments**
``extra_context``
A dictionary of variables to add to the template context. Any
callable object in this dictionary will be called to produce
the end result which appears in the context.
``template_name``
A custom template to use.
**Context:**
``account``
The ``User`` object corresponding to the account, if the
activation was successful. ``False`` if the activation was not
successful.
``expiration_days``
The number of days for which activation keys stay valid after
registration.
Any extra variables supplied in the ``extra_context`` argument
(see above).
**Template:**
registration/activate.html or ``template_name`` keyword argument.
"""
activation_key = activation_key.lower() # Normalize before trying anything with it.
account = RegistrationProfile.objects.activate_user(activation_key)
if extra_context is None:
extra_context = {}
context = RequestContext(request)
for key, value in extra_context.items():
context[key] = callable(value) and value() or value
return render_to_response(template_name,
{ 'account': account,
'expiration_days': settings.ACCOUNT_ACTIVATION_DAYS },
context_instance=context)
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