718 lines
26 KiB
Python
718 lines
26 KiB
Python
"""
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License:
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PyWebServer
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Copyright (C) 2025 Nova
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This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
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Contact:
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E-mail: nova@novacow.ch
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NOTE: Once 2.0 is released, PyWebServer will become the Amethyst Web Server
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This is PyWebServer, an ultra minimalist webserver, meant to still have
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a lot standard webserver features. A comprehensive list is below:
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Features:
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HTTP and HTTPS support.
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Automatically generate certificates using AutoCertGen plugin.
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Blocking per host.
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Easy port configuration.
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Easy to understand documentation and configuration.
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Very small size, compared to something like Apache and NGINX.
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No compromise(-ish) security:
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Directory traversal attack prevention.
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No fuss HTTPS setup.
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Per-host blocking.
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Ability for per-IP blocking.
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Ability for per-UA blocking.
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Simple to understand and mod codebase.
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All GNU GPL-3-or-above license. (Do with it what you want.)
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Library aswell as a standalone script:
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You can easily get access to other parts of the script if you need it.
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TODO: actually put normal comments in
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TODO: INPROG: add typing to all code, new code will feature it by default.
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"""
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import os
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import mimetypes
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import threading
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import ssl
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import socket
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# import re
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import signal
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import sys
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try:
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if not os.getcwd() in sys.path:
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sys.path.append(f"{os.getcwd()}")
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from .certgen import AutoCertGen
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except ImportError:
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# just do nothing, it's not working anyway.
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print(
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"WARN: You need the AutoCertGen plugin! Please install it from\n"
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"https://git.novacow.ch/Nova/AutoCertGen/"
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)
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# pass
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AMETHYST_BUILD_NUMBER = "b0.2.0-0072"
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AMETHYST_REPO = "https://git.novacow.ch/Nova/PyWebServer/"
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class ConfigParser:
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def __init__(self, text):
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self.data: dict = {"hosts": {}, "globals": {}}
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self._parse(text)
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def _parse(self, text):
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lines: list = [
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line.strip()
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for line in text.splitlines()
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if line.strip() and not line.strip().startswith("#")
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]
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current_block: tuple | None = None
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current_name: str | None = None
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for line in lines:
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if line.startswith("host ") and line.endswith("{"):
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current_name = line.split()[1]
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self.data["hosts"][current_name] = {}
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current_block = ("host", current_name)
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continue
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if line == "globals {":
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current_block = ("globals", None)
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continue
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if line == "}":
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current_block = None
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current_name = None
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continue
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if ":" in line and current_block:
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key, value = line.split(":", 1)
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key: str = key.strip()
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value: str = value.strip()
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if "," in value:
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value = [v.strip() for v in value.split(",")]
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if current_block[0] == "host":
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self.data["hosts"][current_name][key] = value
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else:
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self.data["globals"][key] = value
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def query_config(self, key, host=None):
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if host:
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return self.data["hosts"].get(host, {}).get(key)
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if key == "hosts":
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print(f"\n\n\nHosts!\nHosts: {self.data['hosts']}\n\n\n")
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return list(self.data["hosts"].keys())
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return self.data["globals"].get(key)
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class FileHandler:
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def __init__(self, base_dir=None):
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# this is a fucking clusterfuck.
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self.config_file = "amethyst.conf"
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self.config_path = os.path.join(os.getcwd(), self.config_file)
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with open(self.config_path, "r") as f:
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self.cfg = ConfigParser(f.read())
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self.base_dir = self.read_config("directory")
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if not os.path.exists(self.config_path):
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# uuh???
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print(
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"The amethyst.conf file needs to be in the same directory "
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"as amethyst.py! Get the default config file from:\n"
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"https://git.novacow.ch/Nova/PyWebServer/raw/branch/2.0/amethyst.conf"
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)
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exit(1)
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# TODO: fix this please!!
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def read_file(self, file_path, directory=None):
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if "../" in file_path or "%" in file_path:
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return 403, None
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if file_path == "api.py":
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return 404, None
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if directory is not None:
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full_path = os.path.join(directory, file_path.lstrip("/"))
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else:
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full_path = os.path.join(self.base_dir, file_path.lstrip("/"))
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if not os.path.isfile(full_path):
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return 404, None
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try:
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mimetype = mimetypes.guess_type(full_path)
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with open(full_path, "rb") as f:
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return f.read(), mimetype
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except Exception as e:
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print(f"Error reading file {full_path}: {e}")
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return 500, None
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def write_file(self, file_path, data, directory=None):
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if "../" in file_path or "%" in file_path:
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return 403
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full_path = os.path.join(self.base_dir, file_path.lstrip("/"))
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with open(full_path, "a") as f:
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f.write(data)
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return 0
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def read_config(self, key, host_name=None):
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print(
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f"\n\n\nQuery!\nkey: {key}\nhost_name: {host_name}\nret: {self.cfg.query_config(key, host_name)}"
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)
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return self.cfg.query_config(key, host_name)
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def autocert(self):
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"""
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Generate some self-signed certificates using AutoCertGen
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TODO: doesn't work, need to fix. probably add `./` to $PATH
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"""
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autocert = AutoCertGen()
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autocert.gen_cert()
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class RequestParser:
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def __init__(self):
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self.file_handler = FileHandler()
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self.hosts = self.file_handler.read_config("hosts")
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print(f"Hosts: {self.hosts}")
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def parse_request_line(self, line, host):
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"""Parses the HTTP request line."""
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try:
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method, path, version = line.split(" ")
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except ValueError:
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return None, None, None
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if path.endswith("/") or ("." not in path):
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if not path.endswith("/"):
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path += "/"
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index = self.file_handler.read_config("index", host) or "index.html"
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path += f"{index}"
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return method, path, version
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def parse_match_blocks(self, to_parse: str | list):
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if isinstance(to_parse, str):
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to_parse = [to_parse]
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match = []
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literal = []
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for block in to_parse:
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if block.startswith('match("'):
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adx = block[7:-2]
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match.append(adx)
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else:
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literal.append(block)
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return match, literal
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def ua_is_allowed(self, ua, host=None):
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"""Parses and matches UA to block"""
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# return True
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_list = self.file_handler.read_config("block-ua", host)
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if _list is None:
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return True
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match, literal = self.parse_match_blocks(_list)
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if ua in literal:
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return False
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for _ua in match:
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if _ua.lower() in ua.lower():
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return False
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return True
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def is_method_allowed(self, method, host=None):
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"""
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Checks if the HTTP method is allowed.
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Reads allowed methods from a configuration file.
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Falls back to allowing only 'GET' if the file does not exist.
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Should (for now) only be GET as I haven't implemented the logic for PUT
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"""
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allowed_methods = self.file_handler.read_config("allowed-methods", host)
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if allowed_methods is None:
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allowed_methods = ["GET"]
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return method in allowed_methods
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def host_parser(self, host):
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"""
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Parses the host and makes sure it's allowed in
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Mfw im in an ugly code writing contest and my opponent is nova while writing a side project
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"""
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host = f"{host}"
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print(f"hosts: {self.hosts}, host: {host}, split: {host.rsplit(':', 1)[0]}")
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if ":" in host:
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host = host.rsplit(":", 1)[0]
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host = host.lstrip()
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host = host.rstrip()
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if self.hosts is None:
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return True
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if host not in self.hosts:
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if "*" in self.hosts:
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return "catchall"
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return False
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else:
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return True
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class ProxyServer:
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def __init__(self, fh):
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self.file_handler: FileHandler = fh
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def try_connection(
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self, host: str, port: int, data: bytes, chost: str, force_tls: bool = None
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):
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if port in [443, 8443, 9443]:
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do_tls = True
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else:
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if force_tls is True:
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do_tls = True
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else:
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do_tls = False
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print(f"\n\n\nchost: {chost}\n\n\n")
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nhost = self.file_handler.read_config("proxy", chost)
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print(f"\n\n\nnhost: {nhost}\n\n\n")
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if ":" in nhost:
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nport = int(nhost.split(":")[1])
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nhost = nhost.split(":")[0]
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else:
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nport = port
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print(f"{nhost}, {nport}, {data}")
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data = self.reset_host(nhost, nport, data)
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try:
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return self.tcp_send(host, port, data, do_tls)
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except Exception:
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if do_tls is False:
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print("Retrying with TLS...")
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return self.try_connection(host, port, data, chost, True)
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else:
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raise
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@staticmethod
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def reset_host(host: str, port: int, data: bytes):
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data = data.decode()
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data = data.splitlines()
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for line in data:
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print(line)
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if line.startswith("Host:"):
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if port not in [80, 443]:
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new_line = f"Host: {host}:{port}"
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else:
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new_line = f"Host: {host}"
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idx = data.index(line)
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data[idx] = new_line
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print(f"\n\n\n{idx}\n\n\n")
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if line.startswith("Connection:"):
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idx = data.index(line)
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new_line = "Connection: close"
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data[idx] = new_line
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data = "\r\n".join(data)
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data = f"{data}\r\n\r\n"
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print(data)
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return data.encode()
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# return data
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@staticmethod
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def create_tls_context():
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# Create a context that by default verifies with system CAs
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ctx = ssl.create_default_context()
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ctx.check_hostname = False
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ctx.verify_mode = ssl.CERT_NONE
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return ctx
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def tcp_send(self, host, port, data: bytes, do_tls: bool):
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try:
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with socket.create_connection((host, port), timeout=10) as raw_sock:
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raw_sock.settimeout(10)
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if do_tls:
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ctx = self.create_tls_context()
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server_hostname = host
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with ctx.wrap_socket(
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raw_sock, server_hostname=server_hostname
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) as ssock:
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ssock.sendall(data)
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print("data reached")
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return ssock.recv(512000)
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else:
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raw_sock.sendall(data)
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return raw_sock.recv(512000)
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except Exception:
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raise
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class WebServer:
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def __init__(
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self, http_port=8080, https_port=8443, cert_file="cert.pem", key_file="key.pem"
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):
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self.http_port = int(http_port)
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self.https_port = int(https_port)
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self.file_handler = FileHandler()
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self.parser = RequestParser()
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self.cert_file = self.file_handler.read_config("cert") or cert_file
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self.key_file = self.file_handler.read_config("key") or key_file
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self.skip_ssl = False
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# me when no certificate and key file
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if not os.path.exists(self.cert_file) or not os.path.exists(self.key_file):
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if not os.path.exists(self.cert_file) and not os.path.exists(self.key_file):
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pass
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# maybe warn users we purge their key/cert files? xdd
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elif not os.path.exists(self.cert_file):
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os.remove(self.key_file)
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elif not os.path.exists(self.key_file):
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os.remove(self.cert_file)
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print("WARN: No HTTPS certificate was found!")
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if self.file_handler.read_config("disable-autocertgen") is True:
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print("WARN: AutoCertGen is disabled, ignoring...")
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self.skip_ssl = True
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else:
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choice = input("Do you wish to generate an HTTPS certificate? [y/N] ")
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if choice.lower() == "y":
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self.file_handler.autocert()
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else:
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self.skip_ssl = True
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self.no_host_req_response = (
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"This host cannot be reached without sending a `Host` header."
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)
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self.http_socket = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
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self.http_socket.bind(("::", self.http_port))
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self.https_socket = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
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self.https_socket.bind(("::", self.https_port))
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self.proxy_handler = ProxyServer(self.file_handler)
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if self.skip_ssl is False:
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# https gets the ssl treatment!! yaaaay :3
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self.ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
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self.ssl_context.load_cert_chain(
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certfile=self.cert_file, keyfile=self.key_file
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)
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self.https_socket = self.ssl_context.wrap_socket(
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self.https_socket, server_side=True
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)
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self.http_404_html = (
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"<html><head><title>HTTP 404 - Amethyst</title></head>"
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f"<body><center><h1>HTTP 404 - Not Found!</h1><p>Running Amethyst/build-{AMETHYST_BUILD_NUMBER}</p>"
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"</center></body></html>"
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)
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self.http_403_html = (
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"<html><head><title>HTTP 403 - Amethyst</title></head>"
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f"<body><center><h1>HTTP 403 - Forbidden</h1><p>Running Amethyst/build-{AMETHYST_BUILD_NUMBER}</p>"
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"</center></body></html>"
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)
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self.http_405_html = (
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"<html><head><title>HTTP 405 - Amethyst</title></head>"
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f"<body><center><h1>HTTP 405 - Method not allowed</h1><p>Running Amethyst/build-{AMETHYST_BUILD_NUMBER}</p>"
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"</center></body></html>"
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)
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self.running = True
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def start(self, http, https):
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signal.signal(signal.SIGINT, self.shutdown)
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signal.signal(signal.SIGTERM, self.shutdown)
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http_thread = threading.Thread(target=self.start_http, daemon=True)
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https_thread = threading.Thread(target=self.start_https, daemon=True)
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if https is True:
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if self.skip_ssl is True:
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print("WARN: You have enabled HTTPS without SSL!!")
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yn = input("Is this intended behaviour? [y/N] ")
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if yn.lower() == "n":
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exit(1)
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https_thread.start()
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if http is True:
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http_thread.start()
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http_thread.join()
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https_thread.join()
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def start_http(self):
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self.http_socket.listen(5)
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print(f"HTTP server listening on port {self.http_port}...")
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while self.running:
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try:
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conn, addr = self.http_socket.accept()
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self.handle_connection(conn, addr)
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except Exception as e:
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print(f"HTTP error: {e}")
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except OSError:
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break
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def start_https(self):
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self.https_socket.listen(5)
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print(f"HTTPS server listening on port {self.https_port}...")
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while self.running:
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try:
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conn, addr = self.https_socket.accept()
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self.handle_connection(conn, addr)
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except Exception as e:
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print(
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f"HTTPS error: {e}"
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) # be ready for ssl errors if you use a self-sign!!
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except OSError:
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break
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def handle_connection(self, conn, addr):
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try:
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data = conn.recv(32768)
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request = data.decode(errors="ignore")
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if not data:
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response = self.build_response(
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400, "Bad Request"
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) # user did fucky-wucky
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elif len(data) > 8192:
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response = self.build_response(413, "Request too long")
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else:
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response = self.handle_request(request, addr)
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if isinstance(response, str):
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response = response.encode()
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print(len(response))
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conn.sendall(response)
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except Exception as e:
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print(f"Error handling connection: {e}")
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response = self.build_response(
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500,
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"Amethyst is currently unable to serve your request. Below is debug info.\r\n"
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f"Error: {e}; Version: amethyst-b{AMETHYST_BUILD_NUMBER}\r\n"
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"You cannot do anything at this time, the server owner has made a misconfiguration or there is a bug in the program",
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)
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conn.sendall(response)
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finally:
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conn.close()
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def handle_request(self, data, addr):
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print(f"data: {data}")
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request_line = data.splitlines()[0]
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# Extract host from headers, never works though
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for line in data.splitlines():
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if "Host" in line:
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host = line.split(":", 1)[1].strip()
|
|
allowed = self.parser.host_parser(host)
|
|
if allowed == "catchall":
|
|
host = "*"
|
|
allowed = True
|
|
if not allowed:
|
|
return self.build_response(
|
|
403, "Connecting via this host is disallowed."
|
|
)
|
|
break
|
|
else:
|
|
return self.build_response(400, self.no_host_req_response.encode())
|
|
|
|
for line in data.splitlines():
|
|
if "User-Agent" in line:
|
|
ua = line.split(":", 1)[1].strip()
|
|
allowed = self.parser.ua_is_allowed(ua, host)
|
|
if not allowed:
|
|
return self.build_response(
|
|
403, "This UA has been blocked by the owner of this site."
|
|
)
|
|
break
|
|
else:
|
|
return self.build_response(400, "You cannot connect without a User-Agent.")
|
|
|
|
if ":" in host:
|
|
host = host.rsplit(":", 1)[0]
|
|
else:
|
|
host = host
|
|
|
|
method, path, version = self.parser.parse_request_line(request_line, host)
|
|
|
|
if not all([method, path, version]):
|
|
return self.build_response(400, "Bad Request")
|
|
|
|
if self.file_handler.read_config("proxy", host) is not None:
|
|
orig_host = host
|
|
value = self.file_handler.read_config("proxy", host)
|
|
if ":" in value:
|
|
host = value.split(":")[0]
|
|
port = int(value.split(":")[1])
|
|
else:
|
|
host = value
|
|
port = 443
|
|
return self.proxy_handler.try_connection(
|
|
host,
|
|
port,
|
|
data.encode(),
|
|
orig_host,
|
|
)
|
|
|
|
# Figure out a better way to reload config
|
|
if path == "/?pywebsrv_reload_conf=1":
|
|
print("Got reload command! Reloading configuration...")
|
|
self.file_handler = FileHandler()
|
|
self.parser = RequestParser()
|
|
return self.build_response(302, "", host=host)
|
|
|
|
if not self.parser.is_method_allowed(method):
|
|
return self.build_response(405, self.http_405_html)
|
|
|
|
directory = (
|
|
self.file_handler.read_config("directory", host)
|
|
or self.file_handler.base_dir
|
|
)
|
|
|
|
if self.file_handler.read_config("apimode", host) is True:
|
|
if not os.path.join(os.getcwd(), directory) in sys.path:
|
|
sys.path.append(f"{os.path.join(os.getcwd(), directory)}")
|
|
import api
|
|
|
|
apiclass = api.API()
|
|
return apiclass.on_request(data)
|
|
|
|
file_content, mimetype = self.file_handler.read_file(path, directory)
|
|
|
|
if file_content == 403:
|
|
print("WARN: Directory traversal attack prevented.") # look ma, security!!
|
|
return self.build_response(403, self.http_403_html)
|
|
if file_content == 404:
|
|
return self.build_response(404, self.http_404_html)
|
|
if file_content == 500:
|
|
return self.build_response(
|
|
500,
|
|
"Amethyst has encountered a fatal error and cannot serve "
|
|
"your request. Contact the owner with this error: FATAL_FILE_RO_ACCESS",
|
|
) # When there was an issue with reading we throw this.
|
|
|
|
mimetype = mimetype[0]
|
|
if mimetype is None:
|
|
# We have to assume it's binary.
|
|
return self.build_binary_response(
|
|
200, file_content, "application/octet-stream"
|
|
)
|
|
if "text/" not in mimetype:
|
|
return self.build_binary_response(200, file_content, mimetype)
|
|
|
|
return self.build_response(200, file_content)
|
|
|
|
@staticmethod
|
|
def build_binary_response(status_code, binary_data, content_type):
|
|
"""Handles binary files like MP3s."""
|
|
messages = {
|
|
200: "OK",
|
|
403: "Forbidden",
|
|
404: "Not Found",
|
|
405: "Method Not Allowed",
|
|
500: "Internal Server Error",
|
|
}
|
|
status_message = messages.get(status_code)
|
|
headers = (
|
|
f"HTTP/1.1 {status_code} {status_message}\r\n"
|
|
f"Server: Amethyst/amethyst-build-{AMETHYST_BUILD_NUMBER}\r\n"
|
|
f"Content-Type: {content_type}\r\n"
|
|
f"Content-Length: {len(binary_data)}\r\n"
|
|
f"Connection: close\r\n\r\n"
|
|
# Connection close is done because it is way easier to implement.
|
|
# It's not like this program will see production use anyway.
|
|
)
|
|
return headers.encode() + binary_data
|
|
|
|
@staticmethod
|
|
def build_response(status_code, body, host=None):
|
|
"""
|
|
For textfiles we'll not have to guess MIME-types, though the other function
|
|
build_binary_response will be merged in here anyway.
|
|
"""
|
|
messages = {
|
|
200: "OK",
|
|
204: "No Content",
|
|
302: "Found",
|
|
304: "Not Modified", # TODO KEKL
|
|
400: "Bad Request",
|
|
403: "Forbidden",
|
|
404: "Not Found",
|
|
405: "Method Not Allowed",
|
|
413: "Payload Too Large",
|
|
500: "Internal Server Error",
|
|
621: "fuck off! :3",
|
|
}
|
|
status_message = messages.get(status_code)
|
|
|
|
if isinstance(body, str):
|
|
body = body.encode()
|
|
|
|
# TODO: dont encode yet, and i encode. awesome comments here.
|
|
# Don't encode yet, if 302 status code we have to include location.
|
|
headers = (
|
|
f"HTTP/1.1 {status_code} {status_message}\r\n"
|
|
f"Server: Amethyst/build-{AMETHYST_BUILD_NUMBER}\r\n"
|
|
f"Content-Length: {len(body)}\r\n"
|
|
f"Connection: close\r\n\r\n"
|
|
).encode()
|
|
|
|
if status_code == 302:
|
|
# 302 currently only happens when the reload is triggered.
|
|
# Why not 307, Moved Permanently? Because browsers will cache the
|
|
# response and not send the reload command.
|
|
# if port == 443:
|
|
# host = f"https://{host}/"
|
|
# else:
|
|
# host = f"http://{host}/"
|
|
headers = (
|
|
f"HTTP/1.1 {status_code} {status_message}\r\n"
|
|
f"Location: {host}\r\n"
|
|
f"Server: Amethyst/build-{AMETHYST_BUILD_NUMBER}\r\n"
|
|
f"Content-Length: {len(body)}\r\n"
|
|
f"Connection: close\r\n\r\n"
|
|
).encode()
|
|
|
|
if status_code == 621:
|
|
headers = (
|
|
f"HTTP/1.1 {status_code} {status_message}\r\n"
|
|
"Server: Amethyst/build-0621\r\n"
|
|
"Content-Length: 30\r\n"
|
|
f"Connection: close\r\n\r\n"
|
|
)
|
|
body = "https://e621.net/posts/6155664"
|
|
|
|
print(f"{headers + body}")
|
|
return headers + body
|
|
|
|
def shutdown(self, signum, frame):
|
|
print("\nRecieved signal to exit!\nShutting down server...")
|
|
self.running = False
|
|
self.http_socket.close()
|
|
self.https_socket.close()
|
|
sys.exit(0)
|
|
|
|
|
|
def main():
|
|
print(
|
|
"WARNING!!\n"
|
|
f"This is Amethyst alpha build {AMETHYST_BUILD_NUMBER}\n"
|
|
"Since this is an alpha version of Amethyst, most features aren't working!\n"
|
|
"These builds are also very verbose and will spit out a lot on the terminal. "
|
|
"As you can imagine, this is for debugging purposes.\n"
|
|
"THERE IS ABSOLUTELY NO SUPPORT FOR THESE VERSIONS!\n"
|
|
"DO NOT USE THEM IN PRODUCTION SETTINGS!\n"
|
|
f"Please report any bugs on {AMETHYST_REPO}\n"
|
|
)
|
|
input("Press <Enter> to continue. ")
|
|
file_handler = FileHandler()
|
|
file_handler.base_dir = file_handler.read_config("directory")
|
|
http_port = file_handler.read_config("port") or 8080
|
|
https_port = file_handler.read_config("https-port") or 8443
|
|
http_enabled = bool(file_handler.read_config("http")) or True
|
|
print(http_enabled)
|
|
https_enabled = bool(file_handler.read_config("https")) or False
|
|
print(https_enabled)
|
|
server = WebServer(http_port=http_port, https_port=https_port)
|
|
server.start(http_enabled, https_enabled)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|