rat/proxify.py

91 lines
2.9 KiB
Python

import asyncio
import aiohttp
class AsgiproxifyHandler():
def __init__(self, scope):
self.scope = scope
def make_request_url(self):
return 'http://example.org/'
def make_request_cookies(self):
return {}
def make_request_headers(self):
req_headers = {k.decode(): v.decode() for k, v in self.scope['headers']}
req_headers.pop('host', None)
return req_headers
def make_response_headers(self, upstream_headers):
headers = dict(upstream_headers)
headers.pop('Server', None)
headers.pop('Date', None)
resp_headers = [(k, v) for k, v in headers.items()]
return resp_headers
def make_request(self, session):
return session.request('GET', self.make_request_url(),
cookies=self.make_request_cookies(),
headers=self.make_request_headers(),)
class Asgiproxify():
app = None
reg = {}
def __init__(self, app=None):
self.to(app)
def to(self, app):
self.app = app
def install(self, leading_path, handler):
self.reg[leading_path] = handler
def register(self, leading_path):
def decorator(c):
self.install(leading_path, c)
return decorator
async def handle_proxy(self, scope, receive, send, handler):
handler_i = handler(scope)
request = await receive()
async def reverse_proxy_task():
async with aiohttp.ClientSession(auto_decompress=False) as session:
async with handler_i.make_request(session) as resp:
await send({
'type': 'http.response.start',
'status': resp.status,
'headers': handler_i.make_response_headers(resp.headers),
})
async for chunk, end_of_resp in resp.content.iter_chunks():
await send({
'type': 'http.response.body',
'body': chunk,
'more_body': True,
})
await send({ 'type': 'http.response.body' })
task = asyncio.create_task(reverse_proxy_task())
while True:
ev = await receive()
if ev['type'] == 'http.disconnect':
task.cancel()
return
async def __call__(self, scope, receive, send):
if scope['type'] != 'http':
return await self.app(scope, receive, send)
handler = None
for leading_path, proxy_handler in self.reg.items():
if scope['path'].startswith(leading_path):
handler = proxy_handler
if not handler:
return await self.app(scope, receive, send)
else:
return await self.handle_proxy(scope, receive, send, handler)