#!/usr/bin/env python3
"""
HTTP service emulator using Flask.
Accepts all requests, logs every detail (method, path, headers, body),
and responds with configurable pages. Forwards events as JSON to LOG_TARGET if set.
"""
import json
import logging
import os
from pathlib import Path
from flask import Flask, request, send_from_directory
from werkzeug.serving import make_server, WSGIRequestHandler
from decnet_logging import syslog_line, write_syslog_file, forward_syslog
logging.getLogger("werkzeug").setLevel(logging.ERROR)
NODE_NAME = os.environ.get("NODE_NAME", "webserver")
SERVICE_NAME = "http"
LOG_TARGET = os.environ.get("LOG_TARGET", "")
PORT = int(os.environ.get("PORT", "80"))
SERVER_HEADER = os.environ.get("SERVER_HEADER", "Apache/2.4.54 (Debian)")
RESPONSE_CODE = int(os.environ.get("RESPONSE_CODE", "403"))
FAKE_APP = os.environ.get("FAKE_APP", "")
EXTRA_HEADERS = json.loads(os.environ.get("EXTRA_HEADERS", "{}"))
CUSTOM_BODY = os.environ.get("CUSTOM_BODY", "")
FILES_DIR = os.environ.get("FILES_DIR", "")
_FAKE_APP_BODIES: dict[str, str] = {
"apache_default": (
"\n"
"Apache2 Debian Default Page\n"
"Apache2 Debian Default Page
\n"
"It works!
"
),
"nginx_default": (
"Welcome to nginx!\n"
"Welcome to nginx!
\n"
"If you see this page, the nginx web server is successfully installed.
\n"
""
),
"wordpress": (
"WordPress › Error\n"
"\n"
"
Error establishing a database connection
"
),
"phpmyadmin": (
"phpMyAdmin\n"
""
),
"iis_default": (
"IIS Windows Server\n"
"IIS Windows Server
\n"
"Welcome to Internet Information Services
"
),
}
app = Flask(__name__)
@app.after_request
def _fix_server_header(response):
response.headers["Server"] = SERVER_HEADER
return response
def _log(event_type: str, severity: int = 6, **kwargs) -> None:
line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
print(line, flush=True)
write_syslog_file(line)
forward_syslog(line, LOG_TARGET)
@app.before_request
def log_request():
_log(
"request",
method=request.method,
path=request.path,
remote_addr=request.remote_addr,
headers=dict(request.headers),
body=request.get_data(as_text=True)[:512],
)
@app.route("/", defaults={"path": ""})
@app.route("/", methods=["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS", "HEAD"])
def catch_all(path):
# Serve static files directory if configured
if FILES_DIR and path:
files_path = Path(FILES_DIR) / path
if files_path.is_file():
return send_from_directory(FILES_DIR, path)
# Select response body: custom > fake_app preset > default 403
if CUSTOM_BODY:
body = CUSTOM_BODY
elif FAKE_APP and FAKE_APP in _FAKE_APP_BODIES:
body = _FAKE_APP_BODIES[FAKE_APP]
else:
body = (
"\n"
"\n"
"403 Forbidden\n"
"\n"
"Forbidden
\n"
"You don't have permission to access this resource.
\n"
"
\n"
f"{SERVER_HEADER} Server at {NODE_NAME} Port 80\n"
"\n"
)
headers = {"Content-Type": "text/html", **EXTRA_HEADERS}
return body, RESPONSE_CODE, headers
class _SilentHandler(WSGIRequestHandler):
"""Suppress Werkzeug's Server header so Flask's after_request is the sole source."""
def version_string(self) -> str:
return ""
if __name__ == "__main__":
_log("startup", msg=f"HTTP server starting as {NODE_NAME}")
srv = make_server("0.0.0.0", PORT, app, request_handler=_SilentHandler) # nosec B104
srv.serve_forever()