A web server that serves cloud-init files (user-data and meta-data) based on reverse DNS lookup of the IP requesting it.
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#!/usr/bin/env python3
"""
Serve cloud init files
"""
import configparser
import os
import socket
import sys
from ipaddress import AddressValueError, IPv4Address, IPv6Address
import yaml
import cherrypy
from cherrypy.lib.static import serve_file
PATH = os.path.dirname(os.path.abspath(__file__))
CONFIG = configparser.ConfigParser()
CONFIG.read(os.path.join(PATH, "config.ini"))
USER_DATA_FILENAME = CONFIG["app"].get("user_data", "user-data")
META_DATA_FILENAME = CONFIG["app"].get("meta_data", "meta-data")
REDIRECT_FILENAME = CONFIG["app"].get("redirect", "redirect")
class CloudInitApp:
"""
Serve cloud init files
"""
def __init__(self):
self.remoteip = None
self.hostinfo = ('localhost', )
def _can_ip_be_proxy(self):
self.remoteip = cherrypy.request.remote.ip
try:
ipobj = IPv4Address(self.remoteip)
except AddressValueError:
try:
ipobj = IPv6Address(self.remoteip)
except AddressValueError:
return False
return not ipobj.is_global
def _init_ip(self):
"""
Get remote IP
"""
if self._can_ip_be_proxy():
try:
self.remoteip = cherrypy.request.headers.get(
'X-Real-Ip',
cherrypy.request.remote.ip
)
except KeyError:
pass
try:
self.hostinfo = socket.gethostbyaddr(self.remoteip)
except socket.herror:
pass
def _redirect_if_needed(self):
filepath = os.path.join(PATH, "data", self.hostinfo[0],
REDIRECT_FILENAME)
if os.path.exists(filepath):
try:
with open(filepath) as redirect:
content = redirect.read().splitlines()
raise cherrypy.HTTPRedirect(content[0], 301)
except IOError:
return False
return False
@cherrypy.expose
def user_data(self):
"""
Serves a static file
"""
self._init_ip()
self._redirect_if_needed()
filepath = os.path.join(PATH, "data", self.hostinfo[0],
USER_DATA_FILENAME)
if not os.path.exists(filepath):
filepath = os.path.join(PATH, "data", USER_DATA_FILENAME)
return serve_file(filepath, "text/yaml", "attachment")
@cherrypy.expose
def meta_data(self):
"""
Return meta-data in YAML
"""
self._init_ip()
self._redirect_if_needed()
hostname = self.hostinfo[0]
data = {
"instance-id": hostname.split(".")[0],
"local-hostname": hostname
}
filepath = os.path.join(PATH, "data", hostname, META_DATA_FILENAME)
if os.path.exists(filepath):
with open(filepath, "r") as metadata:
for line in metadata.readlines():
linesplit = list(map(lambda k: k.strip(), line.split(":")))
data[linesplit[0]] = linesplit[1]
cherrypy.response.headers['Content-Type'] = \
'text/yaml'
cherrypy.response.headers['Content-Disposition'] = \
'attachment; filename="user-data"'
return yaml.dump(data)
@cherrypy.expose
def vendor_data(self):
"""
Return empty vendor-data
"""
return ""
@cherrypy.expose
def finished(self, data):
"""
Saves additional meta-data
:param data: meta-data to be added
"""
self._init_ip()
folder = os.path.join(PATH, "data", self.hostinfo[0])
if not os.path.exists(folder):
os.makedirs(folder)
with open(os.path.join(folder, META_DATA_FILENAME), "w") as fin:
fin.write(data)
ROOT = CloudInitApp()
if __name__ == "__main__":
cherrypy.server.socket_host = \
CONFIG["server"].get("server_host", "127.0.0.1")
cherrypy.server.socket_port = \
CONFIG["server"].getint("server_port", 8081)
ENGINE = cherrypy.engine
cherrypy.tree.mount(ROOT)
if hasattr(ENGINE, "signal_handler"):
ENGINE.signal_handler.subscribe()
if hasattr(ENGINE, "console_control_handler"):
ENGINE.console_control_handler.subscribe()
try:
ENGINE.start()
except Exception:
sys.exit(1)
else:
ENGINE.block()