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Add MAX_QUERY_LENGTH guard in handle_chat to prevent overly long queries (#83) #90

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Add MAX_QUERY_LENGTH guard in handle_chat to prevent overly long queries (#83) #90

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3 changes: 3 additions & 0 deletions .env.template
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Original file line number Diff line number Diff line change
Expand Up @@ -28,3 +28,6 @@ ELASTIC_PASSWORD=
PAGE_SIZE=1000
GCS_BUCKET=
GCS_PREFIX=

# Query length guard (optional, default: 2000 chars)
# MAX_QUERY_LENGTH=2000 # max allowed query length in characters
12 changes: 12 additions & 0 deletions backend/agents.py
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,11 @@ def _get_genai_client():
FLASH_MODEL = os.getenv("GEMINI_FLASH_MODEL", "gemini-2.5-flash")
FLASH_LITE_MODEL = os.getenv("GEMINI_FLASH_LITE_MODEL", "gemini-2.5-flash-lite")

try:
MAX_QUERY_LENGTH = int(os.getenv("MAX_QUERY_LENGTH", "2000"))
except ValueError:
MAX_QUERY_LENGTH = 2000


# Query intent/types
class QueryIntent(Enum):
Expand Down Expand Up @@ -507,6 +512,13 @@ def reset_session(self, session_id: str):

async def handle_chat(self, session_id: str, query: str, reset: bool = False) -> str:
try:
query = query.strip()
if len(query) > MAX_QUERY_LENGTH:
return (
f"Query too long ({len(query)} chars). "
f"Please keep it under {MAX_QUERY_LENGTH} characters."
)

if reset:
self.reset_session(session_id)
if session_id not in self.chat_history:
Expand Down