Add thread locking and permissions

Mods can lock threads from replying now. Yay!

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

board/forms.py

@@ -6,6 +6,7 @@ from django import forms
 from django.forms import ModelForm, ModelChoiceField
 from django.forms.models import fields_for_model
 from django.utils import timezone
+from django.utils.translation import gettext as _
 from guardian.shortcuts import get_objects_for_user
 from board.models import Ban, Post, Report, ReportReason, ReportRecord
 from hcaptcha.fields import hCaptchaField
@@ -38,7 +39,7 @@ class PostForm(ModelForm):
         capcode = self.cleaned_data["capcode"]
         if capcode:
             if not self.user or not self.user.has_perm("board.use_capcode", capcode):
-                raise ValidationError("Could not create post")
+                raise ValidationError(_("Could not create post"))
 
 
 class ReplyForm(PostForm):
@@ -67,10 +68,12 @@ class ReplyForm(PostForm):
 
     def clean(self):
         super().clean()
+        if self.instance.op.lock:
+            raise ValidationError(_("This thread is locked, you cannot reply to it"))
         capcode = self.cleaned_data["capcode"]
         if capcode:
             if not self.user or not self.user.has_perm("board.use_capcode", capcode):
-                raise ValidationError("Could not create post")
+                raise ValidationError(_("Could not create post"))
 
 
 class ReportForm(ModelForm):
@@ -142,7 +145,7 @@ class PostModifyForm(ModelForm):
         model = Post
         # we specify fields up here too because otherwise they won't be
         # recognized by the form to update values
-        fields = ["sticky", "bump"]
+        fields = ["sticky", "bump", "lock"]
 
     def __init__(self, *args, user, **kwargs):
         super(PostModifyForm, self).__init__(*args, **kwargs)
@@ -152,6 +155,8 @@ class PostModifyForm(ModelForm):
             fields += ["sticky"]
         if self.user.has_perm("board.set_bump"):
             fields += ["bump"]
+        if self.user.has_perm("board.set_lock") and not self.instance.op:
+            fields += ["lock"]
         # NOTE:
         # We do *not* need to check permissions against these fields we're
         # setting down here in the self.clean() function in the case that a