Add max image upload size limit

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

board/models.py

@@ -3,6 +3,7 @@ from pathlib import Path
 from django.db import models
 from django.db.models import signals
 from django.conf import settings
+from django.core.exceptions import ValidationError
 from django.core.files.base import ContentFile
 from django.dispatch import receiver
 from django.urls import reverse
@@ -22,10 +23,7 @@ def image_upload(instance, filename):
     if ext not in (".jpg", ".png", ".gif"):
         raise Exception("File type invalid")
 
-    if instance.op:
-        return f"{instance.board.url}/{instance.op.id}/{now_sec}{ext}"
-    else:
-        return f"{instance.board.url}/{now_sec}{ext}"
+    return f"{instance.board.url}/{now_sec}{ext}"
 
 
 def thumbs_upload(instance, filename):
@@ -33,10 +31,7 @@ def thumbs_upload(instance, filename):
     now = timezone.now()
     now_sec = now.strftime("%s.%f")
     ext = Path(filename).suffix.lower()
-    if instance.op:
-        return f"{instance.board.url}/{instance.op.id}/{now_sec}{ext}"
-    else:
-        return f"{instance.board.url}/{now_sec}t{ext}"
+    return f"{instance.board.url}/{now_sec}t{ext}"
 
 
 class Board(models.Model):
@@ -91,7 +86,7 @@ class Post(models.Model):
 
     def save(self, *args, **kwargs):
         if self.image:
-            self.original_image_name = self.image.name
+            self.original_image_name = Path(self.image.name).parts[-1]
             self.__make_thumbnail()
         super(Post, self).save(*args, **kwargs)
 
@@ -134,6 +129,13 @@ class Post(models.Model):
                 + f"#p{self.id}"
             )
 
+    def clean(self):
+        if self.image and self.image.size > settings.MAX_UPLOAD_SIZE:
+            raise ValidationError(
+                "Image supplied is too large. Maximum image size is %(max)s",
+                params={"max": settings.MAX_UPLOAD_SIZE},
+            )
+
 
 @receiver(signals.post_save, sender=Post)
 def post_created(sender, instance, created, **kwargs):