[svn] Add user registration and user profiles.

Used modified versions of django-registration and django-profiles , both on bitbucket.

The Person model is now set up as the profile for auth.User s.

I set up a requestcontext so that settings is automatically passed to every template, no need to repeat ourselves in views. However, this needs to be refined: I will soon change it to only pass a subset of settings. E.G. we do not need to be passing the DB login and password!
Copied from http://cucc@cucc.survex.com/svn/trunk/expoweb/troggle/, rev. 8231 by aaron @ 1/29/2009 11:02 PM

registration/forms.py

@@ -0,0 +1,134 @@
+"""
+Forms and validation code for user registration.
+
+"""
+
+
+from django.contrib.auth.models import User
+from django import forms
+from django.utils.translation import ugettext_lazy as _
+
+from registration.models import RegistrationProfile
+
+
+# I put this on all required fields, because it's easier to pick up
+# on them with CSS or JavaScript if they have a class of "required"
+# in the HTML. Your mileage may vary. If/when Django ticket #3515
+# lands in trunk, this will no longer be necessary.
+attrs_dict = { 'class': 'required' }
+
+
+class RegistrationForm(forms.Form):
+    """
+    Form for registering a new user account.
+    
+    Validates that the requested username is not already in use, and
+    requires the password to be entered twice to catch typos.
+    
+    Subclasses should feel free to add any additional validation they
+    need, but should either preserve the base ``save()`` or implement
+    a ``save()`` method which returns a ``User``.
+    
+    """
+    username = forms.RegexField(regex=r'^\w+$',
+                                max_length=30,
+                                widget=forms.TextInput(attrs=attrs_dict),
+                                label=_(u'username'))
+    email = forms.EmailField(widget=forms.TextInput(attrs=dict(attrs_dict,
+                                                               maxlength=75)),
+                             label=_(u'email address'))
+    password1 = forms.CharField(widget=forms.PasswordInput(attrs=attrs_dict, render_value=False),
+                                label=_(u'password'))
+    password2 = forms.CharField(widget=forms.PasswordInput(attrs=attrs_dict, render_value=False),
+                                label=_(u'password (again)'))
+    
+    def clean_username(self):
+        """
+        Validate that the username is alphanumeric and is not already
+        in use.
+        
+        """
+        try:
+            user = User.objects.get(username__iexact=self.cleaned_data['username'])
+        except User.DoesNotExist:
+            return self.cleaned_data['username']
+        raise forms.ValidationError(_(u'This username is already taken. Please choose another.'))
+
+    def clean(self):
+        """
+        Verifiy that the values entered into the two password fields
+        match. Note that an error here will end up in
+        ``non_field_errors()`` because it doesn't apply to a single
+        field.
+        
+        """
+        if 'password1' in self.cleaned_data and 'password2' in self.cleaned_data:
+            if self.cleaned_data['password1'] != self.cleaned_data['password2']:
+                raise forms.ValidationError(_(u'You must type the same password each time'))
+        return self.cleaned_data
+    
+    def save(self):
+        """
+        Create the new ``User`` and ``RegistrationProfile``, and
+        returns the ``User`` (by calling
+        ``RegistrationProfile.objects.create_inactive_user()``).
+        
+        """
+        new_user = RegistrationProfile.objects.create_inactive_user(username=self.cleaned_data['username'],
+                                                                    password=self.cleaned_data['password1'],
+                                                                    email=self.cleaned_data['email'])
+        return new_user
+
+
+class RegistrationFormTermsOfService(RegistrationForm):
+    """
+    Subclass of ``RegistrationForm`` which adds a required checkbox
+    for agreeing to a site's Terms of Service.
+    
+    """
+    tos = forms.BooleanField(widget=forms.CheckboxInput(attrs=attrs_dict),
+                             label=_(u'I have read and agree to the Terms of Service'),
+                             error_messages={ 'required': u"You must agree to the terms to register" })
+
+
+class RegistrationFormUniqueEmail(RegistrationForm):
+    """
+    Subclass of ``RegistrationForm`` which enforces uniqueness of
+    email addresses.
+    
+    """
+    def clean_email(self):
+        """
+        Validate that the supplied email address is unique for the
+        site.
+        
+        """
+        if User.objects.filter(email__iexact=self.cleaned_data['email']):
+            raise forms.ValidationError(_(u'This email address is already in use. Please supply a different email address.'))
+        return self.cleaned_data['email']
+
+
+class RegistrationFormNoFreeEmail(RegistrationForm):
+    """
+    Subclass of ``RegistrationForm`` which disallows registration with
+    email addresses from popular free webmail services; moderately
+    useful for preventing automated spam registrations.
+    
+    To change the list of banned domains, subclass this form and
+    override the attribute ``bad_domains``.
+    
+    """
+    bad_domains = ['aim.com', 'aol.com', 'email.com', 'gmail.com',
+                   'googlemail.com', 'hotmail.com', 'hushmail.com',
+                   'msn.com', 'mail.ru', 'mailinator.com', 'live.com']
+    
+    def clean_email(self):
+        """
+        Check the supplied email address against a list of known free
+        webmail domains.
+        
+        """
+        email_domain = self.cleaned_data['email'].split('@')[1]
+        if email_domain in self.bad_domains:
+            raise forms.ValidationError(_(u'Registration using free email addresses is prohibited. Please supply a different email address.'))
+        return self.cleaned_data['email']