restrict file upload to certain types

cookbook/helper/image_processing.py

@@ -35,6 +35,20 @@ def get_filetype(name):
         return '.jpeg'
 
 
+def is_file_type_allowed(filename, image_only=False):
+    is_file_allowed = False
+    allowed_file_types = ['.pdf','.docx', '.xlsx']
+    allowed_image_types = ['.png', '.jpg', '.jpeg']
+    check_list = allowed_image_types
+    if not image_only:
+        check_list += allowed_file_types
+
+    for file_type in check_list:
+        if filename.endswith(file_type):
+            is_file_allowed = True
+
+    return is_file_allowed
+
 # TODO this whole file needs proper documentation, refactoring, and testing
 # TODO also add env variable to define which images sizes should be compressed
 # filetype argument can not be optional, otherwise this function will treat all images as if they were a jpeg