Add ability to create bans from reports

This is done in the admin view and opens a new iframed window. The ban
form is pretty barebones and doesn't have full functionality yet, but
that is coming.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/forms.py

@@ -1,8 +1,10 @@
 from django.conf import settings
 from django.db import transaction
 from django.db.models import Q
+from django import forms
 from django.forms import ModelForm, ModelChoiceField
-from board.models import Post, Report, ReportReason, ReportRecord
+from django.utils import timezone
+from board.models import Ban, Post, Report, ReportReason, ReportRecord
 from hcaptcha.fields import hCaptchaField
 
 
@@ -74,3 +76,32 @@ class ReportForm(ModelForm):
                 record = ReportRecord.objects.create(post=self.op)
         self.instance.record = record
         return super(ReportForm, self).clean()
+
+
+class BanForm(ModelForm):
+    """
+    A form used to create bans based on specific posts.
+    """
+
+    # uses ban_form.html
+    duration = forms.IntegerField(label="Duration (days)", min_value=1, required=False)
+
+    class Meta:
+        model = Ban
+        fields = ["ban_reason"]
+
+    def __init__(self, *args, op, **kwargs):
+        super(BanForm, self).__init__(*args, **kwargs)
+        self.op = op
+        self.instance.board = op.board
+        self.instance.ip = op.ip
+
+    def clean(self):
+        super(BanForm, self).clean()
+        now = timezone.now()
+        duration = self.cleaned_data["duration"]
+        if duration:
+            expires = now + timezone.timedelta(days=duration)
+        else:
+            expires = None
+        self.instance.expires = expires