796 lines
24 KiB
Python
796 lines
24 KiB
Python
import re
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import redis
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import requests
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import socket
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import time
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import json
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import hashlib
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import ipaddress
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import hmac, ipaddress
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from datetime import datetime
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from urllib.parse import urlparse, quote, unquote, urljoin
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from functools import wraps
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from typing import Optional
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from datetime import timezone
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import json as _json
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from flask import (
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Flask,
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request,
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render_template,
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abort,
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jsonify,
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stream_with_context,
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g,
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Response,
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)
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from flask_compress import Compress
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from flask_limiter import Limiter
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import config
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app = Flask(__name__)
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app.config["MAX_CONTENT_LENGTH"] = config.MAX_CONTENT_LENGTH
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app.config["SECRET_KEY"] = config.SECRET_KEY
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app.debug = config.FLASK_DEBUG
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def build_redis():
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if config.REDIS_URL:
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return redis.Redis.from_url(config.REDIS_URL)
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return redis.Redis(
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host=config.REDIS_HOST, port=config.REDIS_PORT, db=config.REDIS_DB
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)
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redis_client = build_redis()
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def get_client_ip():
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xff = request.headers.get("X-Forwarded-For", "").split(",")
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if xff and xff[0].strip():
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return xff[0].strip()
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return request.remote_addr
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limiter = Limiter(
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key_func=get_client_ip,
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app=app,
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default_limits=[config.RATE_LIMIT_DEFAULT],
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storage_uri=config.REDIS_URL,
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)
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Compress(app)
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@app.before_request
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def track_request_data():
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g.start_time = time.perf_counter()
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redis_client.incr(
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f"stats:user_agents:{quote(request.headers.get('User-Agent', 'Unknown'), safe='')}"
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)
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redis_client.incr(f"stats:client_ips:{get_client_ip()}")
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redis_client.incr(f"stats:methods:{request.method}")
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@app.after_request
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def finalize_response(response):
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elapsed = time.perf_counter() - g.start_time
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redis_client.incrbyfloat("stats:processing_time_total", elapsed)
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redis_client.incr("stats:processing_time_count")
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try:
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current_min = float(redis_client.get("stats:processing_time_min") or elapsed)
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if elapsed < current_min:
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redis_client.set("stats:processing_time_min", elapsed)
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except Exception:
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redis_client.set("stats:processing_time_min", elapsed)
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try:
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current_max = float(redis_client.get("stats:processing_time_max") or elapsed)
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if elapsed > current_max:
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redis_client.set("stats:processing_time_max", elapsed)
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except Exception:
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redis_client.set("stats:processing_time_max", elapsed)
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path = request.path or "/"
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if response.status_code >= 400:
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response.headers["Cache-Control"] = "no-store"
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return response
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if path.startswith("/static/"):
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response.headers.pop("Content-Disposition", None)
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if path.endswith((".css", ".js")):
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response.headers["Cache-Control"] = "public, max-age=31536000, immutable"
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else:
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response.headers["Cache-Control"] = "public, max-age=86400"
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return response
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if path == "/":
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response.headers["Cache-Control"] = "private, no-store"
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return response
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return response
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@app.template_filter("datetimeformat")
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def datetimeformat_filter(value, format="%Y-%m-%d %H:%M"):
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try:
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dt = datetime.fromisoformat(value)
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return dt.strftime(format)
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except (ValueError, AttributeError):
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return value
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def basic_auth_required(realm: str, user: str, password: str):
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def decorator(f):
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@wraps(f)
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def wrapper(*args, **kwargs):
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if not config.STATS_BASIC_AUTH_ENABLED:
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return f(*args, **kwargs)
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auth = request.authorization
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if (
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auth
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and auth.type == "basic"
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and auth.username == user
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and auth.password == password
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):
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return f(*args, **kwargs)
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resp = Response(status=401)
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resp.headers["WWW-Authenticate"] = f'Basic realm="{realm}"'
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return resp
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return wrapper
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return decorator
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def cache_key(source_url, ip):
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return f"cache:{source_url}:{ip}"
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def should_ignore_domain(domain):
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return domain.startswith(".") or any(
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ch in domain for ch in ["~", "=", "$", "'", "^", "_", ">", "<", ":"]
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)
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def should_ignore_line(line):
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return any(sym in line for sym in ["<", ">", "##", "###", "div", "span"])
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def is_valid_domain(domain):
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return bool(re.compile(r"^(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}$").match(domain))
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def is_private_client_ip() -> bool:
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ip = get_client_ip()
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try:
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return ipaddress.ip_address(ip).is_private
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except Exception:
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return False
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def convert_host_line(line: str, target_ip: str):
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# szybkie odrzucenia
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if not line:
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return None
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line = line.strip()
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if not line or line.startswith(("!", "#", "/", ";")):
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return None
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for sep in (" #", " ;"):
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idx = line.find(sep)
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if idx != -1:
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line = line[:idx].rstrip()
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if not line:
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return None
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m = re.match(r"^\|\|([a-z0-9.-]+)\^", line, re.IGNORECASE)
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if m:
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domain = m.group(1).strip(".")
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if not should_ignore_domain(domain) and is_valid_domain(domain):
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return f"{target_ip} {domain}"
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return None
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parts = line.split()
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if len(parts) >= 2 and (
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re.match(r"^\d{1,3}(?:\.\d{1,3}){3}$", parts[0]) or ":" in parts[0]
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):
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domain = parts[1].strip().split("#", 1)[0].strip().strip(".")
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if not should_ignore_domain(domain) and is_valid_domain(domain):
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return f"{target_ip} {domain}"
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return None
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m = re.match(r"^(?:address|server)=/([a-z0-9.-]+)/", line, re.IGNORECASE)
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if m:
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domain = m.group(1).strip(".")
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if not should_ignore_domain(domain) and is_valid_domain(domain):
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return f"{target_ip} {domain}"
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return None
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token = parts[0].split("#", 1)[0].strip().strip(".")
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if token and not should_ignore_domain(token) and is_valid_domain(token):
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return f"{target_ip} {token}"
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return None
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def build_etag(
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up_etag: Optional[str], up_lastmod: Optional[str], target_ip: str
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) -> str:
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base = (up_etag or up_lastmod or "no-upstream") + f"::{target_ip}::v1"
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return 'W/"' + hashlib.sha1(base.encode("utf-8")).hexdigest() + '"'
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def cache_headers(etag: str, up_lm: Optional[str]):
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headers = {
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"ETag": etag,
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"Vary": "Accept-Encoding",
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"Content-Type": "text/plain; charset=utf-8",
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"X-Content-Type-Options": "nosniff",
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# "Content-Disposition": "inline; filename=converted_hosts.txt",
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}
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if config.CACHE_ENABLED:
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headers["Cache-Control"] = (
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f"public, s-maxage={config.CACHE_S_MAXAGE}, max-age={config.CACHE_MAX_AGE}"
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)
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else:
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headers["Cache-Control"] = "no-store"
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if up_lm:
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headers["Last-Modified"] = up_lm
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return headers
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def validate_and_normalize_url(url):
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url = (url or "").strip()
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# prosta sanity-check: usuń CR/LF
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if any(c in url for c in ("\r", "\n")):
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raise ValueError("Invalid characters in URL")
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parsed = urlparse(url)
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if not parsed.scheme:
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url = f"https://{url}"
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parsed = urlparse(url)
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# akceptuj tylko http/https
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if parsed.scheme not in {"http", "https"}:
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raise ValueError(f"Unsupported scheme: {parsed.scheme}")
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if not parsed.netloc:
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raise ValueError("Missing host in URL")
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return parsed.geturl()
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def track_url_request(url):
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redis_client.incr(f"stats:url_requests:{quote(url, safe='')}")
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def add_recent_link(url, target_ip):
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ts = datetime.now().isoformat()
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new_item = f"{ts}|{url}|{target_ip}"
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key = "recent_links"
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current = redis_client.lrange(key, 0, -1)
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filtered = []
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for raw in current:
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try:
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s = raw.decode()
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parts = s.split("|")
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if len(parts) >= 3 and parts[1] == url and parts[2] == target_ip:
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continue
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except Exception:
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pass
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filtered.append(raw)
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with redis_client.pipeline() as pipe:
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pipe.delete(key)
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pipe.lpush(key, new_item)
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if filtered:
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pipe.rpush(key, *filtered[:99])
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pipe.ltrim(key, 0, 9)
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pipe.execute()
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redis_client.incr("stats:recent_links_added")
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def get_recent_links():
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links = redis_client.lrange("recent_links", 0, 9)
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out = []
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for link in links:
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parts = link.decode().split("|")
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if len(parts) >= 3:
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out.append((parts[0], parts[1], parts[2]))
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elif len(parts) == 2:
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out.append((parts[0], parts[1], "127.0.0.1"))
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return out
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def get_hostname(ip):
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key = f"reverse_dns:{ip}"
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cached = redis_client.get(key)
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if cached:
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return cached.decode()
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try:
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hostname = socket.gethostbyaddr(ip)[0]
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except Exception:
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hostname = ip
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redis_client.setex(key, 3600, hostname)
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return hostname
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def add_recent_convert():
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ip = get_client_ip()
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hostname = get_hostname(ip)
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ua = request.headers.get("User-Agent", "Unknown")
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time_str = datetime.now().astimezone().isoformat()
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url = request.full_path
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data = {
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"url": url,
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"ip": ip,
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"hostname": hostname,
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"time": time_str,
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"user_agent": ua,
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}
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redis_client.lpush("recent_converts", json.dumps(data))
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redis_client.ltrim("recent_converts", 0, 99)
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def validate_ip(value: str) -> str:
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v = (value or "").strip()
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try:
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return str(ipaddress.ip_address(v))
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except Exception:
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raise ValueError("Invalid IP address")
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@app.route("/favicon.ico", methods=["GET"])
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def favicon():
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return Response(status=204)
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@app.route("/", methods=["GET"])
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def index():
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recent_links = get_recent_links()
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try:
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return render_template(
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"form.html",
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recent_links=recent_links,
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client_ip=get_client_ip(),
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user_agent=request.headers.get("User-Agent", "Unknown"),
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)
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except Exception:
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return jsonify(
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{
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"recent_links": recent_links,
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"client_ip": get_client_ip(),
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"user_agent": request.headers.get("User-Agent", "Unknown"),
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}
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)
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@app.route("/convert")
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@limiter.limit(config.RATE_LIMIT_CONVERT)
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def convert():
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def is_private_client_ip() -> bool:
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ip = get_client_ip()
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try:
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return ipaddress.ip_address(ip).is_private
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except Exception:
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return False
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requested_debug = request.args.get("debug", "").lower() in (
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"1",
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"true",
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"t",
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"yes",
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"y",
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"on",
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)
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debug_allowed = False
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if config.DEBUG_ENABLE:
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header_key = request.headers.get("X-Debug-Key", "")
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if (
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config.DEBUG_KEY
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and header_key
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and hmac.compare_digest(header_key, config.DEBUG_KEY)
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):
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debug_allowed = True
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elif is_private_client_ip():
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debug_allowed = True
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if requested_debug and not debug_allowed:
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abort(403)
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debug_mode = requested_debug and debug_allowed
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debug_lines = []
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def d(msg):
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ts = datetime.now().isoformat()
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line = f"# [DEBUG {ts}] {msg}"
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debug_lines.append(line)
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app.logger.debug(line)
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def debug_response(status=200):
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body = "\n".join(debug_lines) + ("\n" if debug_lines else "")
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resp = Response(body, mimetype="text/plain; charset=utf-8", status=status)
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resp.headers["X-Debug-Mode"] = "1"
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resp.headers["Cache-Control"] = "no-store"
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return resp
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try:
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add_recent_convert()
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redis_client.incr("stats:convert_requests")
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if debug_mode:
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d("Start /convert w trybie debug")
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encoded_url = request.args.get("url")
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if not encoded_url:
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if debug_mode:
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d("Brak parametru ?url")
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return debug_response(status=400)
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redis_client.incr("stats:errors_400")
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abort(400, description="Missing URL parameter")
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decoded_url = unquote(encoded_url)
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try:
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normalized_url = validate_and_normalize_url(decoded_url)
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except ValueError as e:
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if debug_mode:
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d(f"Błąd walidacji URL: {e}")
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return debug_response(status=400)
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redis_client.incr("stats:errors_400")
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abort(400)
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try:
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target_ip = validate_ip(request.args.get("ip", "127.0.0.1"))
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except ValueError:
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if debug_mode:
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d("Bad parametr ?ip")
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return debug_response(status=400)
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redis_client.incr("stats:errors_400")
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abort(400, description="Invalid IP")
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if debug_mode:
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d(f"URL (encoded): {encoded_url}")
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d(f"URL (decoded): {decoded_url}")
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d(f"URL (norm): {normalized_url}")
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d(f"target_ip: {target_ip}")
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track_url_request(normalized_url)
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redis_client.incr(f"stats:target_ips:{target_ip}")
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# nagłówki If-*
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req_headers = {}
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inm = request.headers.get("If-None-Match")
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ims = request.headers.get("If-Modified-Since")
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if inm:
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req_headers["If-None-Match"] = inm
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if ims:
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req_headers["If-Modified-Since"] = ims
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if debug_mode:
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d("Wysyłam GET do upstreamu")
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d(f"Nagłówki: {req_headers or '{}'}")
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r = requests.get(
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normalized_url, headers=req_headers, stream=True, timeout=(10, 60)
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)
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ct = r.headers.get("Content-Type", "")
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if debug_mode:
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d(f"Upstream status: {r.status_code}")
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d(f"Content-Type: {ct or '(brak)'}")
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d(f"ETag: {r.headers.get('ETag')}")
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d(f"Last-Modified: {r.headers.get('Last-Modified')}")
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if "text" not in ct and "octet-stream" not in ct and ct != "":
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if debug_mode:
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d("Unsupported Media Type -> 415")
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r.close()
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return debug_response(status=415)
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r.close()
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abort(415, description="Unsupported Media Type")
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if r.status_code == 304:
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etag = build_etag(
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r.headers.get("ETag"), r.headers.get("Last-Modified"), target_ip
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)
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if debug_mode:
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d("Upstream 304 – zwracam 304")
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r.close()
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add_recent_link(normalized_url, target_ip)
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return debug_response(status=304)
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resp = Response(status=304)
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resp.headers.update(cache_headers(etag, r.headers.get("Last-Modified")))
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resp.direct_passthrough = True
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r.close()
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add_recent_link(normalized_url, target_ip)
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return resp
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up_etag = r.headers.get("ETag")
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up_lm = r.headers.get("Last-Modified")
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etag = build_etag(up_etag, up_lm, target_ip)
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if debug_mode:
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d(f"Etag dla klienta: {etag}")
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@stream_with_context
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def body_gen():
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lines_read = 0
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lines_emitted = 0
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try:
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if debug_mode:
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yield "\n".join(debug_lines) + "\n"
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debug_lines.clear()
|
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for line in r.iter_lines(
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decode_unicode=True, chunk_size=config.READ_CHUNK
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):
|
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if line is None:
|
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continue
|
||
lines_read += 1
|
||
if len(line) > config.STREAM_LINE_LIMIT:
|
||
if debug_mode and lines_read <= 5:
|
||
yield f"# [DEBUG] pominięto długi wiersz ({len(line)} bajtów)\n"
|
||
continue
|
||
out = convert_host_line(line, target_ip)
|
||
if out:
|
||
lines_emitted += 1
|
||
yield out + "\n"
|
||
if debug_mode and lines_read <= 5:
|
||
preview = line[:200].replace("\r", "\\r").replace("\n", "\\n")
|
||
yield f"# [DEBUG] podgląd linii {lines_read}: {preview}\n"
|
||
if debug_mode:
|
||
yield f"# [DEBUG] podsumowanie: przeczytano={lines_read}, wyemitowano={lines_emitted}\n"
|
||
if lines_emitted == 0:
|
||
yield "# [DEBUG] Uwaga: 0 linii wynikowych – czy format listy pasuje?\n"
|
||
redis_client.incrby("stats:content_size_total", 0)
|
||
redis_client.incr("stats:content_size_count")
|
||
finally:
|
||
r.close()
|
||
|
||
resp = Response(body_gen(), mimetype="text/plain; charset=utf-8")
|
||
resp.headers.update(cache_headers(etag, up_lm))
|
||
resp.direct_passthrough = True
|
||
redis_client.incr("stats:conversions_success")
|
||
add_recent_link(normalized_url, target_ip)
|
||
return resp
|
||
|
||
except requests.exceptions.RequestException as e:
|
||
app.logger.error(f"Request error: {str(e)}")
|
||
redis_client.incr("stats:errors_500")
|
||
if debug_mode:
|
||
d(f"Wyjątek requests: {e}")
|
||
return debug_response(status=502)
|
||
abort(500)
|
||
except ValueError as e:
|
||
app.logger.error(f"URL validation error: {str(e)}")
|
||
redis_client.incr("stats:errors_400")
|
||
if debug_mode:
|
||
d(f"Wyjątek ValueError: {e}")
|
||
return debug_response(status=400)
|
||
abort(400)
|
||
|
||
|
||
@app.route("/convert", methods=["HEAD"])
|
||
def convert_head():
|
||
encoded_url = request.args.get("url", config.DEFAULT_SOURCE_URL)
|
||
if not encoded_url:
|
||
abort(400)
|
||
decoded_url = unquote(encoded_url)
|
||
validate_and_normalize_url(decoded_url)
|
||
target_ip = validate_ip(request.args.get("ip", "127.0.0.1"))
|
||
etag = build_etag(None, None, target_ip)
|
||
resp = Response(status=200)
|
||
resp.headers.update(cache_headers(etag, None))
|
||
resp.direct_passthrough = True
|
||
return resp
|
||
|
||
|
||
@app.route("/stats")
|
||
@basic_auth_required(
|
||
realm=config.STATS_BASIC_AUTH_REALM,
|
||
user=config.STATS_BASIC_AUTH_USER,
|
||
password=config.STATS_BASIC_AUTH_PASS,
|
||
)
|
||
def stats():
|
||
|
||
stats_data, target_ips, url_requests, user_agents, client_ips = {}, {}, {}, {}, {}
|
||
|
||
# Zbierz klucze stats:*
|
||
for key in redis_client.scan_iter("stats:*"):
|
||
key_str = key.decode()
|
||
value = (redis_client.get(key) or b"0").decode()
|
||
if key_str.startswith("stats:target_ips:"):
|
||
ip = key_str.split(":", 2)[2]
|
||
target_ips[ip] = value
|
||
elif key_str.startswith("stats:url_requests:"):
|
||
url = unquote(key_str.split(":", 2)[2])
|
||
url_requests[url] = value
|
||
elif key_str.startswith("stats:user_agents:"):
|
||
ua = unquote(key_str.split(":", 2)[2])
|
||
user_agents[ua] = value
|
||
elif key_str.startswith("stats:client_ips:"):
|
||
ip = key_str.split(":", 2)[2]
|
||
client_ips[ip] = value
|
||
else:
|
||
stats_data[key_str] = value
|
||
|
||
recent_converts = []
|
||
for entry in redis_client.lrange("recent_converts", 0, 99):
|
||
try:
|
||
recent_converts.append(json.loads(entry.decode()))
|
||
except Exception:
|
||
pass
|
||
|
||
# Agregaty szczegółowe
|
||
processing_time_total = float(redis_client.get("stats:processing_time_total") or 0)
|
||
processing_time_count = int(redis_client.get("stats:processing_time_count") or 0)
|
||
avg_processing_time = (
|
||
processing_time_total / processing_time_count
|
||
if processing_time_count > 0
|
||
else 0
|
||
)
|
||
|
||
content_size_total = int(redis_client.get("stats:content_size_total") or 0)
|
||
content_size_count = int(redis_client.get("stats:content_size_count") or 0)
|
||
avg_content_size = (
|
||
content_size_total / content_size_count if content_size_count > 0 else 0
|
||
)
|
||
|
||
detailed_stats = {
|
||
"processing_time_total_sec": processing_time_total,
|
||
"processing_time_count": processing_time_count,
|
||
"processing_time_avg_sec": avg_processing_time,
|
||
"processing_time_min_sec": float(
|
||
redis_client.get("stats:processing_time_min") or 0
|
||
),
|
||
"processing_time_max_sec": float(
|
||
redis_client.get("stats:processing_time_max") or 0
|
||
),
|
||
"content_size_total_bytes": content_size_total,
|
||
"content_size_count": content_size_count,
|
||
"content_size_avg_bytes": avg_content_size,
|
||
}
|
||
|
||
# Surowe JSON do sekcji "Raw JSON" na stronie
|
||
raw_json = _json.dumps(
|
||
{
|
||
**stats_data,
|
||
"target_ips": target_ips,
|
||
"url_requests": url_requests,
|
||
"user_agents": user_agents,
|
||
"client_ips": client_ips,
|
||
"recent_converts": recent_converts,
|
||
"detailed_stats": detailed_stats,
|
||
},
|
||
indent=2,
|
||
)
|
||
|
||
return render_template(
|
||
"stats.html",
|
||
stats=stats_data,
|
||
target_ips=target_ips,
|
||
url_requests=url_requests,
|
||
user_agents=user_agents,
|
||
client_ips=client_ips,
|
||
recent=recent_converts,
|
||
detailed=detailed_stats,
|
||
raw_json=raw_json,
|
||
)
|
||
|
||
|
||
@app.route("/stats.json")
|
||
@basic_auth_required(
|
||
realm=config.STATS_BASIC_AUTH_REALM,
|
||
user=config.STATS_BASIC_AUTH_USER,
|
||
password=config.STATS_BASIC_AUTH_PASS,
|
||
)
|
||
def stats_json():
|
||
stats_data, target_ips, url_requests, user_agents, client_ips = {}, {}, {}, {}, {}
|
||
|
||
for key in redis_client.scan_iter("stats:*"):
|
||
key_str = key.decode()
|
||
value = (redis_client.get(key) or b"0").decode()
|
||
if key_str.startswith("stats:target_ips:"):
|
||
ip = key_str.split(":", 2)[2]
|
||
target_ips[ip] = value
|
||
elif key_str.startswith("stats:url_requests:"):
|
||
url = unquote(key_str.split(":", 2)[2])
|
||
url_requests[url] = value
|
||
elif key_str.startswith("stats:user_agents:"):
|
||
ua = unquote(key_str.split(":", 2)[2])
|
||
user_agents[ua] = value
|
||
elif key_str.startswith("stats:client_ips:"):
|
||
ip = key_str.split(":", 2)[2]
|
||
client_ips[ip] = value
|
||
else:
|
||
stats_data[key_str] = value
|
||
|
||
recent_converts = []
|
||
for entry in redis_client.lrange("recent_converts", 0, 99):
|
||
try:
|
||
recent_converts.append(json.loads(entry.decode()))
|
||
except Exception:
|
||
pass
|
||
|
||
processing_time_total = float(redis_client.get("stats:processing_time_total") or 0)
|
||
processing_time_count = int(redis_client.get("stats:processing_time_count") or 0)
|
||
avg_processing_time = (
|
||
processing_time_total / processing_time_count
|
||
if processing_time_count > 0
|
||
else 0
|
||
)
|
||
|
||
content_size_total = int(redis_client.get("stats:content_size_total") or 0)
|
||
content_size_count = int(redis_client.get("stats:content_size_count") or 0)
|
||
avg_content_size = (
|
||
content_size_total / content_size_count if content_size_count > 0 else 0
|
||
)
|
||
|
||
detailed_stats = {
|
||
"processing_time_total_sec": processing_time_total,
|
||
"processing_time_count": processing_time_count,
|
||
"processing_time_avg_sec": avg_processing_time,
|
||
"processing_time_min_sec": float(
|
||
redis_client.get("stats:processing_time_min") or 0
|
||
),
|
||
"processing_time_max_sec": float(
|
||
redis_client.get("stats:processing_time_max") or 0
|
||
),
|
||
"content_size_total_bytes": content_size_total,
|
||
"content_size_count": content_size_count,
|
||
"content_size_avg_bytes": avg_content_size,
|
||
}
|
||
|
||
return jsonify(
|
||
{
|
||
**stats_data,
|
||
"target_ips": target_ips,
|
||
"url_requests": url_requests,
|
||
"user_agents": user_agents,
|
||
"client_ips": client_ips,
|
||
"recent_converts": recent_converts,
|
||
"detailed_stats": detailed_stats,
|
||
}
|
||
)
|
||
|
||
|
||
@app.errorhandler(400)
|
||
@app.errorhandler(403)
|
||
@app.errorhandler(404)
|
||
@app.errorhandler(413)
|
||
@app.errorhandler(415)
|
||
@app.errorhandler(500)
|
||
def handle_errors(e):
|
||
try:
|
||
|
||
now_iso = datetime.now().astimezone().isoformat()
|
||
return render_template(
|
||
"error.html", error=e, code=getattr(e, "code", 500), now_iso=now_iso
|
||
), getattr(e, "code", 500)
|
||
except Exception:
|
||
return jsonify(
|
||
{
|
||
"error": getattr(e, "description", str(e)),
|
||
"code": getattr(e, "code", 500),
|
||
}
|
||
), getattr(e, "code", 500)
|
||
|
||
|
||
if __name__ == "__main__":
|
||
app.run(host=config.BIND_HOST, port=config.BIND_PORT)
|
||
else:
|
||
from asgiref.wsgi import WsgiToAsgi
|
||
|
||
asgi_app = WsgiToAsgi(app)
|