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import base64
import cgi
import json
import os
import re
import socket
import ssl
import sys
from http.server import BaseHTTPRequestHandler
from typing import List, Optional, Tuple
from urllib.parse import urlparse
DEBUG = os.environ.get("DEBUG") is not None
def _irc_send(
server: str,
nick: str,
channel: str,
sasl_password: Optional[str] = None,
server_password: Optional[str] = None,
tls: bool = True,
port: int = 6697,
messages: List[str] = [],
) -> None:
if not messages:
return
sock = socket.socket()
if tls:
sock = ssl.wrap_socket(
sock, cert_reqs=ssl.CERT_NONE, ssl_version=ssl.PROTOCOL_TLSv1_2
)
def _send(command: str) -> int:
if DEBUG:
print(command)
return sock.send((f"{command}\r\n").encode())
def _pong(ping: str):
if ping.startswith("PING"):
sock.send(ping.replace("PING", "PONG").encode("ascii"))
recv_file = sock.makefile(mode="r")
print(f"connect {server}:{port}")
sock.connect((server, port))
if server_password:
_send(f"PASS {server_password}")
_send(f"USER {nick} 0 * :{nick}")
_send(f"NICK {nick}")
for line in recv_file.readline():
if re.match(r"^:[^ ]* (MODE|221|376|422) ", line):
break
else:
_pong(line)
if sasl_password:
_send("CAP REQ :sasl")
_send("AUTHENTICATE PLAIN")
auth = base64.encodebytes(f"{nick}\0{nick}\0{sasl_password}".encode("utf-8"))
_send(f"AUTHENTICATE {auth.decode('ascii')}")
_send("CAP END")
_send(f"JOIN :{channel}")
for m in messages:
_send(f"PRIVMSG {channel} :{m}")
_send("INFO")
for line in recv_file:
if DEBUG:
print(line, end="")
# Assume INFO reply means we are done
if "End of /INFO" in line:
break
else:
_pong(line)
sock.send(b"QUIT")
print("disconnect")
sock.close()
def irc_send(
url: str, notifications: List[str], password: Optional[str] = None
) -> None:
parsed = urlparse(f"{url}")
username = parsed.username or "prometheus"
server = parsed.hostname or "chat.freenode.net"
if parsed.fragment != "":
channel = f"#{parsed.fragment}"
else:
channel = "#krebs-announce"
port = parsed.port or 6697
if not password:
password = parsed.password
if len(notifications) == 0:
return
_irc_send(
server=server,
nick=username,
sasl_password=password,
channel=channel,
port=port,
messages=notifications,
tls=parsed.scheme == "irc+tls",
)
class PrometheusWebHook(BaseHTTPRequestHandler):
def __init__(
self,
irc_url: str,
conn: socket.socket,
addr: Tuple[str, int],
password: Optional[str] = None,
) -> None:
self.irc_url = irc_url
self.password = password
self.rfile = conn.makefile("rb")
self.wfile = conn.makefile("wb")
self.client_address = addr
self.handle()
# for testing
def do_GET(self) -> None:
if DEBUG:
print("GET: Request Received")
self.send_response(200)
self.send_header("Content-type", "text/plain")
self.end_headers()
self.wfile.write(b"ok")
def do_POST(self) -> None:
if DEBUG:
print("POST: Request Received")
content_type, _ = cgi.parse_header(self.headers.get("content-type"))
# refuse to receive non-json content
if content_type != "application/json":
if DEBUG:
print(f"POST: wrong content type {content_type}")
self.send_response(400)
self.end_headers()
return
length = int(self.headers.get("content-length"))
payload = json.loads(self.rfile.read(length))
messages = []
for alert in payload["alerts"]:
description = alert["annotations"]["description"]
messages.append(f"{alert['status']}: {description}")
irc_send(self.irc_url, messages, password=self.password)
self.do_GET()
def systemd_socket_response() -> None:
irc_url = os.environ.get("IRC_URL", None)
if irc_url is None:
print(
"IRC_URL environment variable not set: i.e. IRC_URL=irc+tls://mic92-prometheus@chat.freenode.net/#krebs-announce",
file=sys.stderr,
)
sys.exit(1)
password = None
irc_password_file = os.environ.get("IRC_PASSWORD_FILE", None)
if irc_password_file:
with open(irc_password_file) as f:
password = f.read()
msgs = sys.argv[1:]
if msgs != []:
irc_send(irc_url, msgs, password=password)
return
nfds = os.environ.get("LISTEN_FDS", None)
if nfds is None:
print(
"LISTEN_FDS not set. Run me with systemd(TM) socket activation?",
file=sys.stderr,
)
sys.exit(1)
fds = range(3, 3 + int(nfds))
for fd in fds:
sock = socket.fromfd(fd, socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(0)
try:
while True:
PrometheusWebHook(irc_url, *sock.accept(), password=password)
except BlockingIOError:
# no more connections
pass
if __name__ == "__main__":
if DEBUG:
print("Starting in DEBUG mode")
if len(sys.argv) == 3:
print(f"{sys.argv[1]} {sys.argv[2]}")
irc_send(sys.argv[1], [sys.argv[2]])
else:
systemd_socket_response()
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