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# heavily based on Django's RequestContext
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.template import Context
_mail_context_processors = None
# This is a function rather than module-level procedural code because we only
# want it to execute if somebody uses MailContext.
def get_mail_processors():
global _mail_context_processors
if _mail_context_processors is None:
processors = []
for path in getattr(settings, 'CAMPAIGN_CONTEXT_PROCESSORS', ()):
i = path.rfind('.')
module, attr = path[:i], path[i+1:]
try:
mod = __import__(module, {}, {}, [attr])
except ImportError, e:
raise ImproperlyConfigured('Error importing campaign processor module %s: "%s"' % (module, e))
try:
func = getattr(mod, attr)
except AttributeError:
raise ImproperlyConfigured('Module "%s" does not define a "%s" callable campaign processor' % (module, attr))
processors.append(func)
_mail_context_processors = tuple(processors)
return _mail_context_processors
class MailContext(Context):
"""
This subclass of template.Context automatically populates itself using
the processors defined in CAMPAIGN_CONTEXT_PROCESSORS.
Additional processors can be specified as a list of callables
using the "processors" keyword argument.
"""
def __init__(self, subscriber, dict=None, processors=None):
Context.__init__(self, dict)
if processors is None:
processors = ()
else:
processors = tuple(processors)
for processor in get_mail_processors() + processors:
self.update(processor(subscriber))
self.update({'recipient': subscriber})