PoC code in poc directory.
This commit is contained in:
Roberto Abdelkader Martínez Pérez
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#!/usr/bin/env python
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from functools import partial
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from urllib.parse import urlparse
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from uuid import uuid4
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import asyncio
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import io
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import logging
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import os
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import shlex
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import sys
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from aiohttp import web, StreamReader
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log = logging.getLogger('kapow')
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########################################################################
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# Resource Management #
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########################################################################
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CONNECTIONS = {}
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class ConnectionHandler:
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def __init__(self, request):
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self._stream = None
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self._body = io.BytesIO()
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self._status = 200
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self._headers = dict()
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self._cookies = dict()
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self.request = request
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async def get(self, key):
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res = urlparse(key)
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def nrd(n):
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"""Return the nrd element in a path."""
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return res.path.split('/')[n]
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if res.path == 'request/method':
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return self.request.method.encode('utf-8')
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elif res.path == 'request/body':
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return self.request.content
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elif res.path == 'request/path':
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return self.request.path.encode('utf-8')
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elif res.path.startswith('request/match/'):
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return self.request.match_info[nrd(2)].encode('utf-8')
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elif res.path.startswith('request/param/'):
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return self.request.context['request'].rel_url.query[nrd(2)].encode('utf-8')
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elif res.path.startswith('request/header/'):
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return self.request.headers[nrd(2)].encode('utf-8')
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elif res.path.startswith('request/cookie/'):
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return self.request.cookies[nrd(2)].encode('utf-8')
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elif res.path.startswith('request/form/'):
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return (await self.request.post())[nrd(2)].encode('utf-8')
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elif res.path.startswith('request/file/'):
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name = nrd(2)
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content = nrd(3) # filename / content
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field = (await self.request.post())[name]
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if content == 'filename':
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try:
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return field.filename.encode('utf-8')
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except:
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return b''
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elif content == 'content':
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try:
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return field.file.read()
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except:
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return b''
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else:
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raise ValueError(f'Unknown content type {content!r}')
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else:
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raise ValueError('Unknown path')
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async def set(self, key, content):
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res = urlparse(key)
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def nrd(n):
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return res.path.split('/')[n]
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if res.path == 'response/status':
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self._status = int((await content.read()).decode('utf-8'))
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elif res.path == 'response/body':
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self._body.write(await content.read())
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elif res.path.startswith('response/header/'):
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clean = (await content.read()).rstrip(b'\n').decode('utf-8')
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self._headers[nrd(2)] = clean
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elif res.path.startswith('response/cookie/'):
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clean = (await content.read()).rstrip(b'\n').decode('utf-8')
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self._headers[nrd(2)] = clean
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elif res.path == 'response/stream':
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if self._stream is None:
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self._stream = web.StreamResponse(status=self._status,
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reason="OK",
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headers=self._headers)
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for name, value in self._cookies:
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self._stream.set_cookie(name, value)
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await self._stream.prepare(self.request)
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chunk = await content.readany()
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while chunk:
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await self._stream.write(chunk)
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chunk = await content.readany()
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else:
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raise ValueError(f'Unknown path {res.path!r}')
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async def append(self, key, value):
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raise NotImplementedError()
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async def build_response(self):
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if self._stream is None:
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response = web.Response(body=self._body.getvalue(),
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status=self._status,
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headers=self._headers)
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for name, value in self._cookies.items():
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response.set_cookie(name, value)
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return response
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else:
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await self._stream.write_eof()
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return self._stream
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async def get_resource(request):
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id = request.match_info["id"]
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resource = request.match_info["resource"]
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maybe_content = await CONNECTIONS[id].get(resource)
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if isinstance(maybe_content, StreamReader):
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content = maybe_content
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response = web.StreamResponse(status=200, reason="OK")
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await response.prepare(request)
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chunk = await content.readany()
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while chunk:
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await response.write(chunk)
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chunk = await content.readany()
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await response.write_eof()
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return response
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else:
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body = maybe_content
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return web.Response(body=body)
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async def set_resource(request):
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id = request.match_info["id"]
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resource = request.match_info["resource"]
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await CONNECTIONS[id].set(resource, request.content)
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return web.Response(body=b'')
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async def append_resource(request):
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pass
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########################################################################
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# Endpoint Execution #
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########################################################################
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def handle_route(entrypoint, command):
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async def _handle(request):
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id = "CONN_" + str(uuid4()).replace('-', '_')
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connection = CONNECTIONS[id] = ConnectionHandler(request)
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executable, *params = shlex.split(entrypoint)
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args = ' '.join([shlex.quote(token) for token in params] + [shlex.quote(command)])
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# Run the source
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shell_task = await asyncio.create_subprocess_exec(
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args,
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executable=executable,
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env={**os.environ,
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"KAPOW_URL": "http://localhost:8080/kapow",
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"KAPOW_CONNECTION": id,
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"PATH": ":".join([os.path.join(os.path.dirname(os.path.realpath(__file__)), "bin"),
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os.environ["PATH"]]),
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},
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shell=False)
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await shell_task.wait()
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del CONNECTIONS[id]
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return await connection.build_response()
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return _handle
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########################################################################
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# Route Management #
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########################################################################
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async def get_routes(request):
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return web.json_response(list(request.app.router))
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async def create_route(request):
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request.app.router._frozen = False
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content = await request.json()
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print(f'Defined new route {content["method"]} {content["url_pattern"]}')
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name = "ROUTE_" + str(uuid4()).replace('-', '_')
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request.app.router.add_route(content["method"],
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content["url_pattern"],
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handle_route(content["entrypoint"],
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content["command"]),
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name=name)
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return web.json_response(name)
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async def delete_route(request):
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id = request.match_info["id"]
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route = request.app.router._named_resources.pop(id)
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request.app.router._resources.remove(route)
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return web.json_response(id)
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########################################################################
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# aiohttp webapp #
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########################################################################
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async def run_init_script():
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if len(sys.argv) > 1:
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# Script given
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# with open(sys.argv[1], 'r') as scriptfile:
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# script = scriptfile.read()
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pass
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else:
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# script = sys.stdin.read()
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raise RuntimeError("Script file is mandatory.")
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shell_task = await asyncio.create_subprocess_shell(
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f"/bin/bash --init-file {sys.argv[1]}",
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# script,
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# executable=os.environ.get('SHELL', '/bin/sh'),
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env={**os.environ,
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"KAPOW_URL": "http://localhost:8080/kapow",
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"PATH": ":".join([os.path.join(os.path.dirname(os.path.realpath(__file__)), "bin"),
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os.environ["PATH"]]),
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})
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await shell_task.wait()
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async def start_background_tasks(app):
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app["debug_tasks"] = app.loop.create_task(run_init_script())
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def main():
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app = web.Application(client_max_size=1024**3)
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app.add_routes([
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web.get('/kapow/routes', get_routes),
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web.post('/kapow/routes', create_route),
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web.delete('/kapow/routes/{id}', delete_route),
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web.get('/kapow/connections/{id}/{resource:.*}', get_resource),
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# web.post('/kapow/connections/{id}/{resource:.*}', append_resource),
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web.put('/kapow/connections/{id}/{resource:.*}', set_resource),
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])
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app.on_startup.append(start_background_tasks)
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web.run_app(app)
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if __name__ == '__main__':
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main()
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