Add authorisation process for sign ups and allow access to EventDetail for basic users (#399)

* CHANGE: First pass at opening up RIGS #233

Whilst it makes it something of a misnomer, the intent is to make the 'view_event' perm a permission to view event details like client/price. I don't see the point in giving everyone 'view_event' and adding a new 'view_event_detail'...Open to arguments the other way.

* CHANGE: New user signups now require admin approval

Given that I intend to reveal much more data to new users this seems necessary...

* CHORE: Fix CI

* FIX: Legacy Profiles are now auto-approved correctly

* Add testing of approval mechanism

This fixes the other functional tests failing because the user cannot login without being approved.

* Superusers bypass approval check

This should fix the remainder of the tests

* Prevent unapproved users logging in through embeds

Test suite doing its job...!

* FIX: Require login on events and event embeds again

Little too far to the open side there Arona... Whooooooops!

* FIX: Use has_oembed decorator for events

* FIX: Re-prevent basic seeing reversion

This is to prevent financials/client data leaking when changed. Hopefully can show them a filtered version in future.

* FIX: Remove mitigation for #264

Someone quietly fixed it, it appears

* FEAT: Add admin email notif when an account is activated and awaiting approval

No async or time-since shenanigans yet!

* FIX: Whoops, undo accidental whitespace change

* FEAT: Add a fifteen min cooldown between emails to admins

Probably not the right way to go about it...but it does work!

TODO: How to handle cooldown-emailing shared mailbox addresses?

* FIX: Remove event modal history deadlink for basic users

Also removes some links on the RIGS homepage that will deadlink for them

* FIX: Wrong perms syntax for history pages

* CHORE: Squash migrations

* FIX: Use a setting for cooldown

* FIX: Minor code improvements

RIGS/forms.py

@@ -2,8 +2,10 @@ from django import forms
 from django.utils import formats
 from django.conf import settings
 from django.core import serializers
+from django.core.mail import EmailMessage, EmailMultiAlternatives
 from django.contrib.auth.forms import UserCreationForm, UserChangeForm, AuthenticationForm, PasswordResetForm
 from registration.forms import RegistrationFormUniqueEmail
+from django.contrib.auth.forms import AuthenticationForm
 from captcha.fields import ReCaptchaField
 import simplejson
 
@@ -33,8 +35,16 @@ class ProfileRegistrationFormUniqueEmail(RegistrationFormUniqueEmail):
         return self.cleaned_data['initials']
 
 
+class CheckApprovedForm(AuthenticationForm):
+    def confirm_login_allowed(self, user):
+        if user.is_approved or user.is_superuser:
+            return AuthenticationForm.confirm_login_allowed(self, user)
+        else:
+            raise forms.ValidationError("Your account hasn't been approved by an administrator yet. Please check back in a few minutes!")
+
+
 # Embedded Login form - remove the autofocus
-class EmbeddedAuthenticationForm(AuthenticationForm):
+class EmbeddedAuthenticationForm(CheckApprovedForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['username'].widget.attrs.pop('autofocus', None)