fix thumbnail dir not being created for new installs, add traceback printing for failed thumbnail printing, fix naive datetime object loading

on new installs, the thumbnail directory in /viewer/static is not created automatically
when thumbnail generation fails for any reason, tracebacks are not printed
i fixed the numerous warnings generated by not setting the DateTimeField to a datetime object with a timezone (fixed with dateutil package)

requirements.txt

@@ -3,3 +3,4 @@ humanize~=3.1.0
 django-jsonfield~=1.4.1
 opencv-python~=4.4.0.46
 Pillow~=8.0.1
+python-dateutil~=2.8.1

viewer/models.py

@@ -1,5 +1,6 @@
 import mimetypes
 import os
+import traceback
 import uuid
 from datetime import datetime
 from typing import Tuple
@@ -8,10 +9,16 @@ import humanize
 import jsonfield
 from django.db import models
 from django.urls import reverse
+from dateutil.tz import tzlocal
 from django.utils import timezone
 
 from viewer import helpers
 
+try:
+    os.makedirs(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'static', 'thumbnails'))
+except FileExistsError:
+    pass
+
 
 class ServedDirectory(models.Model):
     """
@@ -105,7 +112,8 @@ class File(models.Model):
     fileLastModified = models.DateTimeField(null=True, default=None)
     size = models.PositiveIntegerField(null=True)
     resolution = models.OneToOneField(ImageResolution, on_delete=models.CASCADE, related_name='file', null=True)
-    thumbnailResolution = models.OneToOneField(ImageResolution, on_delete=models.CASCADE, related_name='real_file', null=True)
+    thumbnailResolution = models.OneToOneField(ImageResolution, on_delete=models.CASCADE, related_name='real_file',
+                                               null=True)
 
     @classmethod
     def create(cls, full_path: str, parent: ServedDirectory, refresh: bool = True) -> 'File':
@@ -134,7 +142,7 @@ class File(models.Model):
         """Refresh this file's metadata"""
         self.lastRefreshed = timezone.now()
 
-        fileLastModified = datetime.fromtimestamp(os.path.getmtime(self.path))
+        fileLastModified = datetime.fromtimestamp(os.path.getmtime(self.path), tz=tzlocal())
         updated = fileLastModified != self.fileLastModified
         self.fileLastModified = fileLastModified
 
@@ -214,6 +222,7 @@ class File(models.Model):
         try:
             helpers.generate_thumbnail(self.path, self.__thumbs_path)
         except Exception:
+            traceback.print_exc()
             print(f'Could not thumbnail: {self.filename}')
             self.delete_thumbnail()
 

viewer/views.py

@@ -82,6 +82,7 @@ def submit_new(request):
         if not os.path.isdir(request.POST['path']):
             raise ValueError('A invalid Directory was specified in the request.')
         s.save()
+        s.refresh()
     except KeyError:
         return render(request, 'message.html', status=403,
                       context={'title': 'Invalid Options',