validators.py

import os
from django.core.exceptions import ValidationError

def validate_file_extension(value):
    ext = os.path.splitext(value.name)[1]  # [0] returns path+filename
    valid_extensions = ['.pdf', '.doc', '.docx', '.xlsx', '.xls', '.csv']
    if not ext.lower() in valid_extensions:
        raise ValidationError('Unsupported file extension.')
    

def validate_image_extension(value):
    ext = os.path.splitext(value.name)[1]  # [0] returns path+filename
    valid_extensions = ['.pdf', '.png', '.jpg', '.jpeg', '.svg', '.eps', '.tif', '.tiff']
    if not ext.lower() in valid_extensions:
        raise ValidationError('Unsupported file extension.')