Makes sure BCC is provided to *every* e-mail. (#65)

* Replaces the monkey patch on send_mail, and replaces it with a monkey patch on EmailMessage’s constructor.

* Removes spurious print statements.

* Minimum viable changes to get schedule to display (#64)

* All migrations are now in this tree

* Replaces the monkey patch on send_mail, and replaces it with a monkey patch on EmailMessage’s constructor.

* Removes spurious print statements.

pinaxcon/monkey_patch.py

@@ -12,7 +12,7 @@ class MonkeyPatchMiddleware(object):
 
 def do_monkey_patch():
     patch_speaker_profile_form()
-    patch_accounts_to_send_bcc()
+    patch_mail_to_send_bcc()
     fix_sitetree_check_access_500s()
     never_cache_login_page()
 
@@ -33,31 +33,91 @@ def patch_speaker_profile_form():
     fields["accessibility"].widget = widgets.AceMarkdownEditor()
 
 
-def patch_accounts_to_send_bcc():
-    ''' Patches django-user-accounts' email functions to send a BCC e-mail to
+def patch_mail_to_send_bcc():
+    ''' Patches django.core.mail's message classes to send a BCC e-mail to
     the default BCC e-mail address. '''
 
-    from account import hooks
+    from django.core.mail import message
 
-    # django-user-accounts always uses send_mail like:
-    # send_mail(subject, message, settings.DEFAULT_FROM_EMAIL, to)
+    ARG = "bcc"
 
     if hasattr(settings, "ENVELOPE_BCC_LIST"):
         bcc_email = settings.ENVELOPE_BCC_LIST
     else:
-        bcc_email = None
+        return  # We don't need to do this patch.
 
-    def send_mail(subject, message, from_email, to):
-        email = EmailMultiAlternatives(
-            subject,
-            message,
-            from_email,
-            to,
-            bcc=bcc_email,
-        )
-        email.send()
+    def bcc_arg_position(f):
+        ''' Returns the position of 'bcc' in the argument list to f, or None if
+        there is no such argument. '''
+        co = f.__code__
+        # The first co_argcount members of co_varnames are argument variables
+        for i, argname in enumerate(co.co_varnames[:co.co_argcount]):
+            if argname == ARG:
+                return i
+        else:
+            return None
 
-    hooks.send_mail = send_mail
+    def bcc_is_provided_positionally(f, a):
+        ''' Returns true if 'bcc' is provided as a positional argument to f,
+        when it is called with the argument list `a`. '''
+
+        return bcc_arg_position(f) < len(a)
+
+    def patch_bcc_positional(f, a):
+        ''' Returns a copy of `a`, but with the bcc argument patched to include
+        our BCC list. '''
+
+        pos = bcc_arg_position(f)
+        bcc = a[pos]
+
+        if bcc is not None:
+            bcc = list(bcc)
+        else:
+            bcc = []
+
+        bcc += bcc_email
+
+        return tuple(a[:pos] + (bcc,) + a[pos + 1:])
+
+
+    def patch_bcc_keyword(f, k):
+        ''' Adds our BCC list to the BCC list in the keyword arguments, and
+        returns the new version of the keyword arguments.
+
+        Arguments:
+            f (callable): The function that we're patching. It should have an
+                argument called bcc.
+            k (dict): A dictionary of kwargs to be provided to EmailMessage.
+            It will be modified to add the BCC list specified in
+            settings.ENVELOPE_BCC_LIST, if provided.
+        '''
+
+        if ARG in k:
+            bcc = list(k[ARG])
+            del k[ARG]
+        else:
+            bcc = []
+        bcc += list(bcc_email)
+        k[ARG] = bcc
+
+        return k
+
+    to_wrap = message.EmailMessage.__init__
+    
+    @wraps(to_wrap)
+    def email_message__init__(*a, **k):
+
+        if bcc_is_provided_positionally(to_wrap, a):
+            a = patch_bcc_positional(to_wrap, a)
+        else:
+            k = patch_bcc_keyword(to_wrap, k)
+
+        return to_wrap(*a, **k)
+
+    message.EmailMessage.__init__ = email_message__init__
+
+    # Do not need to wrap EmailMultiAlternatives because it is a subclass of
+    # EmailMessage.
 
 
 def fix_sitetree_check_access_500s():