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import json
import logging
import socket
import ssl
import time
from pathlib import Path
from typing import Any, List, Optional
from stream.cert_manager import CertificateManager
from stream.interceptors import HttpInterceptor
from stream.proxy_connector import ProxyConnector
class ProxyServer:
"""
Asynchronous HTTPS proxy server with SSL inspection capabilities
"""
def __init__(
self,
host: str = "0.0.0.0",
port: int = 3120,
intercept_domains: Optional[List[str]] = None,
upstream_proxy: Optional[str] = None,
queue: Optional[Any] = None,
):
self.host = host
self.port = port
self.intercept_domains = intercept_domains or []
self.passthrough_domains = [
"feedback-pa.clients6.google.com",
"play.google.com",
"apis.google.com",
"accounts.google.com",
]
self.upstream_proxy = upstream_proxy
self.queue = queue
# Initialize components
self.cert_manager = CertificateManager()
self.proxy_connector = ProxyConnector(upstream_proxy)
# Create logs directory
log_dir = Path("logs")
log_dir.mkdir(exist_ok=True)
self.interceptor = HttpInterceptor(str(log_dir))
# Set up logging
self.logger = logging.getLogger("proxy_server")
# Keep track of background tasks
self.background_tasks = set()
def _safe_close(self, writer):
"""
Safely close a writer with robust error handling for SSL shutdown timeouts
"""
if not writer:
return
try:
sock = writer.get_extra_info("socket")
if sock:
try:
sock.shutdown(socket.SHUT_RDWR)
except (OSError, ssl.SSLError):
pass
except Exception:
pass
finally:
try:
writer.close()
except Exception:
pass
def should_intercept(self, host):
"""
Determine if the connection to the host should be intercepted
"""
if host in self.passthrough_domains:
return False
if host in self.intercept_domains:
return True
for d in self.intercept_domains:
if d.startswith("*."):
suffix = d[1:]
if host.endswith(suffix):
return True
return False
async def handle_client(
self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter
):
"""
Handle a client connection
"""
current_task = asyncio.current_task()
if current_task:
self.background_tasks.add(current_task)
current_task.add_done_callback(self.background_tasks.discard)
try:
request_line = await reader.readline()
request_line = request_line.decode("utf-8").strip()
if not request_line:
self._safe_close(writer)
return
parts = request_line.split(" ")
if len(parts) < 2:
self._safe_close(writer)
return
method, target = parts[0], parts[1]
if method == "CONNECT":
await self._handle_connect(reader, writer, target)
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.error(f"Error handling client: {e}", exc_info=True)
finally:
self._safe_close(writer)
async def _handle_connect(
self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter, target: str
):
"""
Handle CONNECT method (for HTTPS connections)
"""
host, port_str = target.split(":")
port = int(port_str)
intercept = self.should_intercept(host)
if intercept:
self.cert_manager.get_domain_cert(host)
writer.write(b"HTTP/1.1 200 Connection Established\r\n\r\n")
await writer.drain()
await reader.read(8192)
loop = asyncio.get_running_loop()
transport = writer.transport
if transport is None:
self.logger.warning(
f"Client writer transport is None for {host}:{port} before TLS upgrade. Closing."
)
return
ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
ssl_context.load_cert_chain(
certfile=self.cert_manager.cert_dir / f"{host}.crt",
keyfile=self.cert_manager.cert_dir / f"{host}.key",
)
client_protocol = transport.get_protocol()
new_transport = await loop.start_tls(
transport=transport,
protocol=client_protocol,
sslcontext=ssl_context,
server_side=True,
)
if new_transport is None:
self.logger.error(
f"loop.start_tls returned None for {host}:{port}, which is unexpected. Closing connection.",
exc_info=True,
)
writer.close()
return
client_writer = asyncio.StreamWriter(
transport=new_transport,
protocol=client_protocol,
reader=reader,
loop=loop,
)
try:
(
server_reader,
server_writer,
) = await self.proxy_connector.create_connection(
host, port, ssl=ssl.create_default_context()
)
await self._forward_data_with_interception(
reader, client_writer, server_reader, server_writer, host
)
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.error(
f"Error connecting to server {host}:{port}: {e}", exc_info=True
)
client_writer.close()
try:
await client_writer.wait_closed()
except Exception:
pass
else:
writer.write(b"HTTP/1.1 200 Connection Established\r\n\r\n")
await writer.drain()
await reader.read(8192)
try:
(
server_reader,
server_writer,
) = await self.proxy_connector.create_connection(host, port, ssl=None)
await self._forward_data(reader, writer, server_reader, server_writer)
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.error(
f"Error connecting to server {host}:{port}: {e}", exc_info=True
)
writer.close()
try:
await writer.wait_closed()
except Exception:
pass
async def _forward_data(
self,
client_reader: asyncio.StreamReader,
client_writer: asyncio.StreamWriter,
server_reader: asyncio.StreamReader,
server_writer: asyncio.StreamWriter,
) -> None:
async def _forward(
reader: asyncio.StreamReader, writer: asyncio.StreamWriter
) -> None:
try:
while True:
data = await reader.read(8192)
if not data:
break
writer.write(data)
await writer.drain()
except ConnectionResetError:
self.logger.debug("Connection reset by peer.")
except Exception as e:
self.logger.error(f"Error forwarding data: {e}", exc_info=True)
finally:
self._safe_close(writer)
client_to_server = asyncio.create_task(_forward(client_reader, server_writer))
server_to_client = asyncio.create_task(_forward(server_reader, client_writer))
tasks = [client_to_server, server_to_client]
try:
_done, pending = await asyncio.wait(
tasks, return_when=asyncio.FIRST_COMPLETED
)
except asyncio.CancelledError:
for task in tasks:
task.cancel()
await asyncio.gather(*tasks, return_exceptions=True)
raise
for task in pending:
task.cancel()
try:
await task
except asyncio.CancelledError:
pass
async def _forward_data_with_interception(
self,
client_reader: asyncio.StreamReader,
client_writer: asyncio.StreamWriter,
server_reader: asyncio.StreamReader,
server_writer: asyncio.StreamWriter,
host: str,
) -> None:
client_buffer = bytearray()
server_buffer = bytearray()
should_sniff = False
request_context = {"request_ts": 0.0}
async def _process_client_data():
nonlocal client_buffer, should_sniff
try:
while True:
data = await client_reader.read(8192)
if not data:
break
client_buffer.extend(data)
if b"\r\n\r\n" in client_buffer:
headers_end = client_buffer.find(b"\r\n\r\n") + 4
headers_data = client_buffer[:headers_end]
body_data = client_buffer[headers_end:]
lines = headers_data.split(b"\r\n")
request_line = lines[0].decode("utf-8")
try:
_method, path, _ = request_line.split(" ")
except ValueError:
server_writer.write(client_buffer)
await server_writer.drain()
client_buffer.clear()
continue
if "GenerateContent" in path or "generateContent" in path:
should_sniff = True
request_context["request_ts"] = time.time()
# Reset interceptor state for new request to prevent
# state leakage from previous requests
self.interceptor.reset_for_new_request()
self.logger.debug(
f"[Proxy] Detected GenerateContent request: {path[:60]}..."
)
processed_body = await self.interceptor.process_request(
bytes(body_data), host, path
)
server_writer.write(headers_data)
if isinstance(processed_body, bytes):
server_writer.write(processed_body)
else:
should_sniff = False
server_writer.write(client_buffer)
await server_writer.drain()
client_buffer.clear()
else:
server_writer.write(data)
await server_writer.drain()
client_buffer.clear()
except ConnectionResetError:
self.logger.debug("Connection reset by peer processing client data.")
except Exception as e:
if "Broken pipe" in str(e) or "Connection reset" in str(e):
self.logger.debug(f"[Proxy] Client disconnected: {e}")
else:
self.logger.error(
f"Error processing client data: {e}", exc_info=True
)
finally:
self._safe_close(server_writer)
async def _process_server_data():
nonlocal server_buffer, should_sniff
try:
while True:
data = await server_reader.read(8192)
if not data:
break
server_buffer.extend(data)
if b"\r\n\r\n" in server_buffer:
headers_end = server_buffer.find(b"\r\n\r\n") + 4
headers_data = server_buffer[:headers_end]
body_data = server_buffer[headers_end:]
lines = headers_data.split(b"\r\n")
status_code = 200
status_message = "OK"
if lines and lines[0]:
try:
status_line = lines[0].decode("utf-8")
parts = status_line.split(" ", 2)
if len(parts) >= 2:
status_code = int(parts[1])
status_message = parts[2] if len(parts) > 2 else ""
except (ValueError, UnicodeDecodeError):
pass
headers: dict[str, str] = {}
for i in range(1, len(lines)):
if not lines[i]:
continue
try:
key, value = lines[i].decode("utf-8").split(":", 1)
headers[key.strip()] = value.strip()
except ValueError:
continue
if should_sniff:
try:
if status_code >= 400:
self.logger.error(
f"[UPSTREAM ERROR] {status_code} {status_message}"
)
if self.queue is not None:
error_payload = {
"error": True,
"status": status_code,
"message": f"{status_code} {status_message}",
"done": True,
}
self.queue.put(json.dumps(error_payload))
else:
resp = await self.interceptor.process_response(
bytes(body_data), host, "", headers
)
if self.queue is not None:
payload = {
"ts": request_context.get("request_ts", 0),
"data": resp,
}
self.queue.put(json.dumps(payload))
if resp.get("done", False):
self.logger.debug(
f"[Proxy] Stream complete: body={len(resp.get('body', ''))}"
)
except asyncio.CancelledError:
raise
except Exception as e:
self.logger.error(
f"Error during response interception: {e}",
exc_info=True,
)
client_writer.write(data)
if b"0\r\n\r\n" in server_buffer:
server_buffer.clear()
except ConnectionResetError:
self.logger.debug("Connection reset by peer processing server data.")
except Exception as e:
self.logger.error(f"Error processing server data: {e}", exc_info=True)
finally:
self._safe_close(client_writer)
client_to_server = asyncio.create_task(_process_client_data())
server_to_client = asyncio.create_task(_process_server_data())
tasks = [client_to_server, server_to_client]
try:
_done, pending = await asyncio.wait(
tasks, return_when=asyncio.FIRST_COMPLETED
)
except asyncio.CancelledError:
for task in tasks:
task.cancel()
await asyncio.gather(*tasks, return_exceptions=True)
raise
for task in pending:
task.cancel()
try:
await task
except asyncio.CancelledError:
pass
async def start(self) -> None:
"""
Start the proxy server
"""
server = await asyncio.start_server(self.handle_client, self.host, self.port)
addr = server.sockets[0].getsockname()
self.logger.debug(f"[Proxy] Serving on: {addr}")
if self.queue:
try:
self.queue.put("READY")
self.logger.debug("[Proxy] Sent READY signal")
except Exception as e:
self.logger.error(f"Failed to send 'READY' signal: {e}", exc_info=True)
async with server:
await server.serve_forever()
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