fix: an approved knowledge or file tool loses its sources (#32439)

With tool approval set to ask, a knowledge or file tool the user approved ran and answered, but no sources were saved on the reply or shown below it. The same call without approval listed them as usual. The sources of an approved call are now saved and shown the same way.

Fixes #32436

backend/open_webui/utils/middleware.py

@@ -441,6 +441,9 @@ def _split_tool_calls(
     return expanded
 
 
+CITATION_TOOL_NAMES = ('fetch_url', 'view_file', 'view_knowledge_file', 'query_knowledge_files', 'query_chat_files')
+
+
 def get_citation_source_from_tool_result(
     tool_name: str, tool_params: dict, tool_result: str, tool_id: str = ''
 ) -> list[dict]:
@@ -3622,6 +3625,14 @@ async def resume_tool_calls(request, form_data, user, model, metadata, message)
                     request, name, result, tool_type, direct_tool, metadata, user
                 )
                 await terminal_event_handler(name, params, result, event_emitter)
+                citations_enabled = (model.get('info', {}).get('meta', {}).get('capabilities') or {}).get(
+                    'citations', True
+                )
+                if event_emitter and citations_enabled and name in CITATION_TOOL_NAMES and result:
+                    for source in get_citation_source_from_tool_result(
+                        tool_name=name, tool_params=params, tool_result=result, tool_id=tool.get('tool_id', '')
+                    ):
+                        await event_emitter({'type': 'source', 'data': source})
             content = tool_result_content(result)
             item['arguments'] = tool_call.get('function', {}).get('arguments', '{}')
             output_parts = [{'type': 'input_text', 'text': content}]
@@ -6138,18 +6149,7 @@ async def streaming_chat_response_handler(response, ctx):
                         )
 
                         # Extract citation sources from tool results
-                        if (
-                            citations_enabled
-                            and tool_function_name
-                            in [
-                                'fetch_url',
-                                'view_file',
-                                'view_knowledge_file',
-                                'query_knowledge_files',
-                                'query_chat_files',
-                            ]
-                            and tool_result
-                        ):
+                        if citations_enabled and tool_function_name in CITATION_TOOL_NAMES and tool_result:
                             try:
                                 citation_sources = get_citation_source_from_tool_result(
                                     tool_name=tool_function_name,