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#!/usr/bin/env python3
#
# Copyright (C) 2021 jahoti <jahoti@tilde.team>
# Licensing information is collated in the `copyright` file
"""
A modular "virtual network" proxy,
wrapping the classes in proxy_core.py
"""
import proxy_core
from urllib.parse import parse_qs
from misc_constants import *
from world_wide_library import catalog as internet
class RequestHijacker(proxy_core.ProxyRequestHandler):
def handle_request(self, req_body):
path_components = self.path.split('?', maxsplit=1)
path = path_components[0]
try:
# Response format: (status_code, headers (dict. of strings),
# body as bytes or filename containing body as string)
if path in internet:
info = internet[path]
if type(info) == tuple:
status_code, headers, body_file = info
if type(body_file) == str:
if 'Content-Type' not in headers and '.' in body_file:
ext = body_file.rsplit('.', maxsplit=1)[-1]
if ext in mime_types:
headers['Content-Type'] = mime_types[ext]
with open(body_file, mode='rb') as f:
body_file = f.read()
else:
# A function to evaluate to get the response
get_params, post_params = {}, {}
if len(path_components) == 2:
get_params = parse_qs(path_components[1])
# Parse POST parameters; currently only supports
# application/x-www-form-urlencoded
if req_body:
post_params = parse_qs(req_body.encode())
status_code, headers, body_file = info(self.command, get_params, post_params)
if type(body_file) == str:
body_file = body_file.encode()
if type(status_code) != int or status_code <= 0:
raise Exception('Invalid status code %r' % status_code)
for header, header_value in headers.items():
if type(header) != str:
raise Exception('Invalid header key %r' % header)
elif type(header_value) != str:
raise Exception('Invalid header value %r' % header_value)
else:
status_code, headers = 404, {'Content-Type': 'text/plain'}
body_file = b'Handler for this URL not found.'
except Exception as e:
status_code, headers, body_file = 500, {'Content-Type': 'text/plain'}, b'Internal Error:\n' + repr(e).encode()
headers['Content-Length'] = str(len(body_file))
self.send_response(status_code)
for header, header_value in headers.items():
self.send_header(header, header_value)
self.end_headers()
self.wfile.write(body_file)
def do_an_internet(certdir, port):
"""Start up the proxy/server"""
proxy_core.certdir = certdir
httpd = proxy_core.ThreadingHTTPServer(('', port), RequestHijacker)
httpd.serve_forever()
if __name__ == '__main__':
import sys
def fail(msg, error_code):
print('Error:', msg)
print('Usage:', sys.argv[0], '[certificates directory] (port)')
sys.exit(error_code)
if len(sys.argv) < 2:
fail('missing required argument "certificates directory".', 1)
certdir = sys.argv[1]
if not proxy_core.os.path.isdir(certdir):
fail('selected certificate directory does not exist.', 2)
port = sys.argv[2] if len(sys.argv) > 2 else '1337'
if not port.isnumeric():
fail('port must be an integer.', 3)
do_an_internet(certdir, int(port))
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