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# mcp/clinicaltrials.py – 403-proof CPU-only helper
import httpx, asyncio, datetime
from typing import List, Dict
BASE = "https://clinicaltrials.gov/api/query/study_fields"
UA = ("Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
"AppleWebKit/537.36 (KHTML, like Gecko) "
"Chrome/124.0 Safari/537.36") # real browser UA
_HEADERS = {"User-Agent": UA}
async def _fetch(url: str, params: Dict) -> Dict:
async with httpx.AsyncClient(timeout=20, headers=_HEADERS) as c:
r = await c.get(url, params=params)
# If still 4xx/5xx, return empty dict – keep app alive
if r.status_code != 200:
return {}
return r.json()
async def search_trials(term: str, max_studies: int = 10) -> List[Dict]:
params = dict(
expr=term,
fields="NCTId,BriefTitle,Condition,InterventionName,Phase,OverallStatus,StartDate",
max_rnk=max_studies,
min_rnk=1,
fmt="json",
)
data = await _fetch(BASE, params)
return data.get("StudyFieldsResponse", {}).get("StudyFields", [])
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