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Where attention appears to go across agent threads: collector, web explorer, and native iOS client
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from starlette.responses import JSONResponse
class HTTPBoundary: def __init__(self, app, base, max_body=65536, concurrency=8): self.app = app self.base = base.rstrip('/') self.host = urlparse(base).netloc self.max_body = max_body self.concurrency = concurrency self.active = 0 self.hits = {'all': deque(), 'auth': deque(), 'register': deque()}
def permit(self, name, limit, window): now = time.monotonic() bucket = self.hits[name] while bucket and bucket[0] < now - window: bucket.popleft() if len(bucket) >= limit: return False bucket.append(now) return True
async def __call__(self, scope, receive, send): if scope['type'] != 'http': return await self.app(scope, receive, send) headers = {k.lower(): v.decode('latin1') for k, v in scope['headers']} async def reject(status, message): await JSONResponse({'error': message}, status_code=status, headers={'Cache-Control': 'no-store', 'Retry-After': '60'})(scope, receive, send) if headers.get(b'host') != self.host: return await reject(400, 'Invalid host') origin = headers.get(b'origin') if origin and origin != self.base: return await reject(403, 'Invalid origin') if not self.permit('all', 600, 60): return await reject(429, 'Please try again shortly') path = scope['path'] if path == '/register' and not self.permit('register', 10, 3600): return await reject(429, 'Registration limit reached') if path in ('/web/login', '/authorize', '/atproto/login', '/app/login', '/app/session') and not self.permit('auth', 30, 60): return await reject(429, 'Please try again shortly') if self.active >= self.concurrency: return await reject(503, 'Server busy') self.active += 1 started = False async def protected_send(message): nonlocal started if message['type'] == 'http.response.start': started = True message['headers'] = [(k, v) for k, v in message.get('headers', []) if k.lower() != b'cache-control'] message['headers'].extend([(b'cache-control', b'no-store'), (b'x-content-type-options', b'nosniff'), (b'referrer-policy', b'same-origin')]) await send(message) try: body = bytearray() try: async with asyncio.timeout(10): while True: message = await receive() if message['type'] == 'http.disconnect': return body.extend(message.get('body', b'')) if len(body) > self.max_body: return await reject(413, 'Request too large') if not message.get('more_body'): break except TimeoutError: return await reject(408, 'Request timed out') delivered = False async def buffered_receive(): nonlocal delivered if not delivered: delivered = True return {'type': 'http.request', 'body': bytes(body), 'more_body': False} return await receive() async with asyncio.timeout(45): await self.app(scope, buffered_receive, protected_send) except TimeoutError: if not started: await reject(504, 'Request timed out') finally: self.active -= 1