import_media: prompt user when uploading SVG files

Author: dale-wahl

datasources/media_import/import_media.py

@@ -8,7 +8,7 @@
 
 from backend.lib.processor import BasicProcessor
 from common.config_manager import config
-from common.lib.exceptions import QueryParametersException
+from common.lib.exceptions import QueryParametersException, QueryNeedsExplicitConfirmationException
 from common.lib.user_input import UserInput
 from common.lib.helpers import andify
 
@@ -65,9 +65,10 @@ def validate_query(query, request, user):
         seen_types = set()
         all_files = 0
 
-        uploaded_files = request.files.getlist("option-data_upload")
+        uploaded_files = request.files.getlist("option-data_upload") # if multiple files are uploaded; the first validate_query only has a single file
         single_zip_file = uploaded_files and len(uploaded_files) == 1 and uploaded_files[0].filename.lower().endswith(".zip")
 
+        # option-data_upload-entries is passed the first time the form is submitted if the user has uploaded a zip file
         if "option-data_upload-entries" in request.form or single_zip_file:
             # we have a zip file!
             try:
@@ -96,6 +97,8 @@ def validate_query(query, request, user):
                 # figure out if we have mixed media types
                 seen_types = set()
                 for file in files:
+                    if not query.get("frontend-confirm") and file["filename"].endswith(".svg"):
+                        raise QueryNeedsExplicitConfirmationException("SVG files may not be processed correctly by some 4CAT processors. Are you sure you want to proceed?")
                     try:
                         file_type = mimetypes.guess_type(file["filename"])[0].split("/")[0]
                         seen_types.add(file_type)
@@ -121,6 +124,11 @@ def validate_query(query, request, user):
                 if file.filename == ".metadata.json" or file.filename.endswith(".log"):
                     continue
 
+                # Warn on SVG files
+                if not query.get("frontend-confirm") and file.filename.lower().endswith(".svg"):
+                    raise QueryNeedsExplicitConfirmationException(
+                        "SVG files may not be processed correctly by some 4CAT processors. Are you sure you want to proceed?")
+
                 # when uploading multiple files, we don't want zips
                 if file.filename.lower().endswith(".zip"):
                     raise QueryParametersException("When uploading media in a zip archive, please upload exactly one "