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base.py
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base.py
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#!/usr/bin/python3
#
# base.py
# base (common) file
#
# Caterpillar Proxy - The simple and parasitic web proxy SPAM spam filter
# Namyheon Go (Catswords Research) <[email protected]>
# https://github.com/gnh1201/caterpillar
# Created at: 2024-05-20
# Updated at: 2024-05-21
#
import hashlib
import json
import re
client_encoding = 'utf-8'
def extract_credentials(url):
pattern = re.compile(r'(?P<scheme>\w+://)?(?P<username>[^:/]+):(?P<password>[^@]+)@(?P<url>.+)')
match = pattern.match(url)
if match:
scheme = match.group('scheme') if match.group('scheme') else 'https://'
username = match.group('username')
password = match.group('password')
url = match.group('url')
return username, password, scheme + url
else:
return None, None, url
def jsonrpc2_create_id(data):
return hashlib.sha1(json.dumps(data).encode(client_encoding)).hexdigest()
def jsonrpc2_encode(method, params = None):
data = {
"jsonrpc": "2.0",
"method": method,
"params": params
}
id = jsonrpc2_create_id(data)
data['id'] = id
return (id, json.dumps(data))
def jsonrpc2_result_encode(result, id = ''):
data = {
"jsonrpc": "2.0",
"result": result,
"id": id
}
return json.dumps(data)
def jsonrpc2_error_encode(error, id = ''):
data = {
"jsonrpc": "2.0",
"error": error,
"id": id
}
return json.dumps(data)
class Extension():
extensions = []
protocols = []
buffer_size = 8192
@classmethod
def set_protocol(cls, protocol):
cls.protocols.append(protocol)
@classmethod
def set_buffer_size(cls, _buffer_size):
cls.buffer_size = _buffer_size
@classmethod
def register(cls, f):
cls.extensions.append(f)
@classmethod
def get_filters(cls):
filters = []
for extension in cls.extensions:
if extension.type == "filter":
filters.append(extension)
return filters
@classmethod
def get_rpcmethod(cls, method):
for extension in cls.extensions:
is_exported_method = (method == extension.method) or (method in extension.exported_methods)
if extension.type == "rpcmethod" and is_exported_method:
return extension
return None
@classmethod
def dispatch_rpcmethod(cls, method, type, id, params, conn):
rpcmethod = cls.get_rpcmethod(method)
if rpcmethod:
if rpcmethod.method == method:
return rpcmethod.dispatch(type, id, params, conn)
else:
f = getattr(rpcmethod, method, None)
if f:
return f(type, id, params, conn)
@classmethod
def get_connector(cls, connection_type):
for extension in cls.extensions:
if extension.type == "connector" and extension.connection_type == connection_type:
return extension
return None
@classmethod
def send_accept(cls, conn, method, success = True):
if 'tcp' in cls.protocols:
_, message = jsonrpc2_encode(f"{method}_accept", {
"success": success
})
conn.send(message.encode(client_encoding))
print (f"Accepted request with {cls.protocols[0]} protocol")
@classmethod
def readall(cls, conn):
if 'tcp' in cls.protocols:
data = b''
while True:
try:
chunk = conn.recv(cls.buffer_size)
if not chunk:
break
data += chunk
except:
pass
return data
elif 'http' in cls.protocols:
# empty binary when an file not exists
if 'file' not in conn.request.files:
return b''
# read an uploaded file with binary mode
file = conn.request.files['file']
return file.read()
def __init__(self):
self.type = None
self.method = None
self.exported_methods = []
self.connection_type = None
def test(self, filtered, data, webserver, port, scheme, method, url):
raise NotImplementedError
def dispatch(self, type, id, params, method = None, conn = None):
raise NotImplementedError
def connect(self, conn, data, webserver, port, scheme, method, url):
raise NotImplementedError