files/forms.py

@@ -14,7 +14,9 @@ from constants.base import (
 import files.models
 import files.utils as utils
 
-MAX_UPLOAD_SIZE = 10485760  # 10MB
+# Soft limit for the files, effectively we accept up to 1MB extra
+MAX_UPLOAD_SIZE_MB = 10
+BYTES_TO_MEGABYTE = 1048576 # constant
 logger = logging.getLogger(__name__)
 
 
@@ -63,11 +65,12 @@ class FileForm(forms.ModelForm):
             return
 
         source = self.cleaned_data['source']
-        if source.size > MAX_UPLOAD_SIZE:
+        # We accept files up to 1MB higher than the limit, so the error message can always show complete integers
+        if source.size >= (MAX_UPLOAD_SIZE_MB + 1) * BYTES_TO_MEGABYTE:
             raise forms.ValidationError(
                 {
                     'source': [
-                        'Please keep filesize under 10MB. Current filesize is {source.size} bytes'
+                        f'Please keep filesize under {MAX_UPLOAD_SIZE_MB}MB. Current filesize is {source.size // BYTES_TO_MEGABYTE}MB.'
                     ]
                 },
                 code='invalid',