155 lines
6.7 KiB
Python
155 lines
6.7 KiB
Python
"""IPRoyal residential proxy plumbing.
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The in-process forwarder + the password/session helpers — identical across every market
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worker, so they live here. HTTPS market traffic flows through the CONNECT tunnel, so the
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forwarder only ever relays ciphertext. Ported from the .NET LocalForwardingProxy /
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IpRoyalProxyProvider.
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"""
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import asyncio
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import base64
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import logging
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import uuid
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log = logging.getLogger("proxy")
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def new_session_id() -> str:
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"""Short, opaque, URL-safe token. IPRoyal pins one residential exit IP per distinct
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session value, so a fresh id == a fresh IP."""
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return uuid.uuid4().hex[:10]
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def iproyal_password(password: str, country: str, lifetime_min: int, session_id: str) -> str:
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"""Bake the targeting/session knobs onto the account password, IPRoyal-style:
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"<pass>_country-us_session-<id>_lifetime-60m". Country is optional."""
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pw = password
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if country:
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pw += f"_country-{country}"
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pw += f"_session-{session_id}_lifetime-{lifetime_min}m"
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return pw
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class LocalForwardingProxy:
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"""In-process HTTP proxy on 127.0.0.1 that chains every connection to the IPRoyal
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gateway, injecting the Proxy-Authorization header itself. Chromium ignores creds in
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--proxy-server and the in-browser ways to answer the gateway's 407 (a CDP auth
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handler, or a disabled MV2 extension) are Cloudflare tells — so we terminate the
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browser->proxy hop locally and add auth here, leaving Chrome to talk to an auth-free
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endpoint at zero CDP. HTTPS (all market traffic) flows through the CONNECT tunnel, so
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this proxy only relays ciphertext and never sees plaintext. The active session token
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can be swapped live (set_password) to move to a fresh exit IP without restarting the
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browser. (New tunnels pick up the new IP; any still-open keep-alive tunnel stays on
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the old one until it closes.)"""
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def __init__(self, host: str, port: int, username: str, password: str):
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self._host = host
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self._port = port
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self._username = username
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self._password = password
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self._server: asyncio.AbstractServer | None = None
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self.endpoint = ""
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def set_password(self, password: str) -> None:
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self._password = password
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def _auth_header(self) -> str:
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token = base64.b64encode(f"{self._username}:{self._password}".encode()).decode()
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return f"Proxy-Authorization: Basic {token}\r\n"
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async def start(self) -> "LocalForwardingProxy":
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self._server = await asyncio.start_server(self._handle, "127.0.0.1", 0)
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port = self._server.sockets[0].getsockname()[1]
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self.endpoint = f"127.0.0.1:{port}"
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return self
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async def stop(self) -> None:
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if self._server is not None:
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self._server.close()
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try:
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await self._server.wait_closed()
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except Exception:
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pass
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@staticmethod
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async def _read_header(reader: asyncio.StreamReader) -> str | None:
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"""Read up to the end of the HTTP header block (CRLFCRLF). None on EOF/overflow."""
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try:
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data = await reader.readuntil(b"\r\n\r\n")
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except (asyncio.IncompleteReadError, asyncio.LimitOverrunError):
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return None
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return data.decode("latin-1")
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async def _handle(self, client_reader: asyncio.StreamReader, client_writer: asyncio.StreamWriter) -> None:
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up_writer: asyncio.StreamWriter | None = None
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try:
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header = await self._read_header(client_reader)
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if not header:
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return
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parts = header.split("\r\n", 1)[0].split(" ")
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if len(parts) < 2:
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return
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method, target = parts[0], parts[1]
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up_reader, up_writer = await asyncio.open_connection(self._host, self._port)
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if method.upper() == "CONNECT":
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# HTTPS: open an authenticated tunnel upstream, then relay raw bytes.
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up_writer.write(
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f"CONNECT {target} HTTP/1.1\r\nHost: {target}\r\n{self._auth_header()}\r\n".encode())
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await up_writer.drain()
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up_header = await self._read_header(up_reader)
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status = up_header.split(" ", 2) if up_header else []
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if len(status) < 2 or status[1] != "200":
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line = (up_header or "no response").split("\r\n", 1)[0]
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log.warning("upstream refused CONNECT %s: %s", target, line)
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client_writer.write(b"HTTP/1.1 502 Bad Gateway\r\nConnection: close\r\n\r\n")
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await client_writer.drain()
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return
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client_writer.write(b"HTTP/1.1 200 Connection established\r\n\r\n")
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await client_writer.drain()
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else:
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# Plain HTTP: re-inject the request upstream with auth, then relay.
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idx = header.index("\r\n") + 2
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up_writer.write((header[:idx] + self._auth_header() + header[idx:]).encode())
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await up_writer.drain()
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await self._relay(client_reader, client_writer, up_reader, up_writer)
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except Exception:
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pass # one bad tunnel must never take down the listener
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finally:
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for w in (client_writer, up_writer):
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if w is not None:
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try:
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w.close()
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except Exception:
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pass
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@staticmethod
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async def _relay(
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client_reader: asyncio.StreamReader, client_writer: asyncio.StreamWriter,
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up_reader: asyncio.StreamReader, up_writer: asyncio.StreamWriter) -> None:
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# Pipe both directions, but tear the whole tunnel down as soon as EITHER side
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# closes (mirrors the .NET WhenAny). Waiting for both — as a plain gather does —
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# leaks a task holding two sockets on every half-closed connection, which piles
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# up fast across a long multi-worker run. Closing both writers when the first pipe
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# finishes unblocks the other's pending read so both tasks settle.
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async def pipe(reader: asyncio.StreamReader, writer: asyncio.StreamWriter) -> None:
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try:
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while data := await reader.read(65536):
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writer.write(data)
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await writer.drain()
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except Exception:
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pass
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a = asyncio.create_task(pipe(client_reader, up_writer))
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b = asyncio.create_task(pipe(up_reader, client_writer))
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try:
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await asyncio.wait({a, b}, return_when=asyncio.FIRST_COMPLETED)
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finally:
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for w in (client_writer, up_writer):
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try:
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w.close()
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except Exception:
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pass
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await asyncio.gather(a, b, return_exceptions=True)
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