implement automatic creation of mailbox names

- create mailbox name when saving new mailboxes in admin
- add MailboxManager that implement get_next_mailbox_name as manager for
  Mailbox

docs/changelog.rst

@@ -1,6 +1,7 @@
 Changelog
 =========
 
+* :feature:`-` automatic creation of mailbox names from user names
 * :bug:`-` fix broken mailbox admin
 
 * :release:`0.2.3 <2014-12-26>`

gnuviechadmin/managemails/admin.py

@@ -67,6 +67,8 @@ class MailboxCreationForm(forms.ModelForm):
 
         """
         mailbox = super(MailboxCreationForm, self).save(commit=False)
+        mailbox.username = Mailbox.objects.get_next_mailbox_name(
+            mailbox.osuser)
         mailbox.set_password(self.cleaned_data['password1'])
         if commit:
             mailbox.save()
@@ -118,7 +120,7 @@ class MailboxAdmin(ActivationChangeMixin, admin.ModelAdmin):
     add_fieldsets = (
         (None, {
             'classes': ('wide',),
-            'fields': ('osuser', 'username', 'password1', 'password2')}),
+            'fields': ('osuser', 'password1', 'password2')}),
     )
     search_fields = ('username',)
     ordering = ('username',)

gnuviechadmin/managemails/models.py

@@ -20,12 +20,32 @@ class ActivateAbleMixin(models.Model):
         abstract = True
 
 
+class MailboxManager(models.Manager):
+
+    def get_next_mailbox_name(self, osuser):
+        count = 1
+        mailboxformat = "{0}p{1:02d}"
+        mailboxname = mailboxformat.format(osuser.username, count)
+
+        for box in self.values('username').filter(osuser=osuser).order_by(
+            'username'
+        ):
+            if box['username'] == mailboxname:
+                count += 1
+                mailboxname = mailboxformat.format(osuser.username, count)
+            else:
+                break
+        return mailboxname
+
+
 @python_2_unicode_compatible
 class Mailbox(ActivateAbleMixin, TimeStampedModel, models.Model):
     osuser = models.ForeignKey(OsUser)
     username = models.CharField(max_length=128, unique=True)
     password = models.CharField(max_length=255)
 
+    objects = MailboxManager()
+
     class Meta:
         verbose_name = _('Mailbox')
         verbose_name_plural = _('Mailboxes')