openmedialibrary/oml/node/server.py

255 lines
8.8 KiB
Python

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from socketserver import ThreadingMixIn
from threading import Thread
import base64
import db
import gzip
import hashlib
import http.server
import io
import json
import os
import socket
import socketserver
from Crypto.PublicKey import RSA
from Crypto.Util.asn1 import DerSequence
from OpenSSL.crypto import dump_privatekey, FILETYPE_ASN1
from OpenSSL.SSL import (
Context, Connection, TLSv1_2_METHOD,
VERIFY_PEER, VERIFY_FAIL_IF_NO_PEER_CERT, VERIFY_CLIENT_ONCE
)
import settings
import state
import user
from . import nodeapi
from .sslsocket import fileobject
import logging
logger = logging.getLogger('oml.node.server')
def get_service_id(key):
'''
service_id is the first half of the sha1 of the rsa public key encoded in base32
'''
# compute sha1 of public key and encode first half in base32
pub_der = DerSequence()
pub_der.decode(dump_privatekey(FILETYPE_ASN1, key))
public_key = RSA.construct((pub_der._seq[1], pub_der._seq[2])).exportKey('DER')[22:]
service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower().decode()
return service_id
class TLSTCPServer(socketserver.TCPServer):
def _accept(self, connection, x509, errnum, errdepth, ok):
# client_id is validated in request
return True
def __init__(self, server_address, HandlerClass, bind_and_activate=True):
socketserver.TCPServer.__init__(self, server_address, HandlerClass)
ctx = Context(TLSv1_2_METHOD)
ctx.use_privatekey_file (settings.ssl_key_path)
ctx.use_certificate_file(settings.ssl_cert_path)
# only allow clients with cert:
ctx.set_verify(VERIFY_PEER | VERIFY_CLIENT_ONCE | VERIFY_FAIL_IF_NO_PEER_CERT, self._accept)
#ctx.set_verify(VERIFY_PEER | VERIFY_CLIENT_ONCE, self._accept)
self.socket = Connection(ctx, socket.socket(self.address_family, self.socket_type))
if bind_and_activate:
self.server_bind()
self.server_activate()
def shutdown_request(self,request):
try:
request.shutdown()
except:
pass
class NodeServer(ThreadingMixIn, TLSTCPServer):
allow_reuse_address = True
def api_call(action, user_id, args):
with db.session():
u = user.models.User.get(user_id)
if action in (
'requestPeering', 'acceptPeering', 'rejectPeering', 'removePeering'
) or (u and u.peered):
content = getattr(nodeapi, 'api_' + action)(user_id, *args)
else:
if u and u.pending:
logger.debug('ignore request from pending peer[%s] %s (%s)',
user_id, action, args)
content = {}
else:
content = None
return content
class Handler(http.server.SimpleHTTPRequestHandler):
def setup(self):
self.connection = self.request
self.rfile = fileobject(self.connection, 'rb', self.rbufsize)
self.wfile = fileobject(self.connection, 'wb', self.wbufsize)
def version_string(self):
return settings.USER_AGENT
def do_HEAD(self):
return self.do_GET()
def do_GET(self):
import item.models
id = self.path.split('/')[-1] if self.path.startswith('/get/') else None
if id and len(id) == 32 and id.isalnum():
with db.session():
i = item.models.Item.get(id)
if not i:
self.send_response(404, 'Not Found')
self.send_header('Content-type', 'text/plain')
self.end_headers()
self.wfile.write(b'404 - Not Found')
return
path = i.get_path()
mimetype = {
'epub': 'application/epub+zip',
'pdf': 'application/pdf',
'txt': 'text/plain',
}.get(path.split('.')[-1], None)
self.send_response(200, 'OK')
self.send_header('Content-Type', mimetype)
self.send_header('X-Node-Protocol', settings.NODE_PROTOCOL)
self.send_header('Content-Length', str(os.path.getsize(path)))
self.end_headers()
logger.debug('GET file %s', id)
with open(path, 'rb') as f:
while 1:
data = f.read(16384)
if not data:
break
self.wfile.write(data)
else:
self.send_response(200, 'OK')
self.send_header('Content-type', 'text/plain')
self.send_header('X-Node-Protocol', settings.NODE_PROTOCOL)
self.end_headers()
self.wfile.write('Open Media Library\n'.encode())
def gzip_data(self, data):
encoding = self.headers.get('Accept-Encoding')
if encoding.find('gzip') != -1:
self.send_header('Content-Encoding', 'gzip')
bytes_io = io.BytesIO()
gzip_file = gzip.GzipFile(fileobj=bytes_io, mode='wb')
gzip_file.write(data)
gzip_file.close()
result = bytes_io.getvalue()
bytes_io.close()
return result
else:
return data
def gunzip_data(self, data):
bytes_io = io.BytesIO(data)
gzip_file = gzip.GzipFile(fileobj=bytes_io, mode='rb')
result = gzip_file.read()
gzip_file.close()
return result
def do_POST(self):
'''
API
pullChanges [userid] from [to]
pushChanges [index, change]
requestPeering username message
acceptPeering username message
rejectPeering message
removePeering message
ping responds public ip
'''
x509 = self.connection.get_peer_certificate()
user_id = get_service_id(x509.get_pubkey()) if x509 else None
content = {}
try:
content_len = int(self.headers.get('content-length', 0))
data = self.rfile.read(content_len)
if self.headers.get('Content-Encoding') == 'gzip':
data = self.gunzip_data(data)
except:
logger.debug('invalid request', exc_info=1)
response_status = (500, 'invalid request')
self.write_response(response_status, content)
return
response_status = (200, 'OK')
if self.headers.get('X-Node-Protocol', '') > settings.NODE_PROTOCOL:
state.update_required = True
if self.headers.get('X-Node-Protocol', '') != settings.NODE_PROTOCOL:
logger.debug('protocol missmatch %s vs %s',
self.headers.get('X-Node-Protocol', ''), settings.NODE_PROTOCOL)
logger.debug('headers %s', self.headers)
content = settings.release
else:
try:
action, args = json.loads(data.decode('utf-8'))
except:
logger.debug('invalid data: %s', data, exc_info=1)
response_status = (500, 'invalid request')
content = {
'status': 'invalid request'
}
self.write_response(response_status, content)
return
logger.debug('NODE action %s %s (%s)', action, args, user_id)
if action == 'ping':
content = {
'status': 'ok'
}
else:
content = api_call(action, user_id, args)
if content is None:
content = {'status': 'not peered'}
logger.debug('PEER %s IS UNKNOWN SEND 403', user_id)
response_status = (403, 'UNKNOWN USER')
content = {}
else:
logger.debug('RESPONSE %s: %s', action, content)
self.write_response(response_status, content)
def write_response(self, response_status, content):
self.send_response(*response_status)
self.send_header('X-Node-Protocol', settings.NODE_PROTOCOL)
self.send_header('Content-Type', 'application/json')
content = json.dumps(content, ensure_ascii=False).encode('utf-8')
content = self.gzip_data(content)
self.send_header('Content-Length', str(len(content)))
self.end_headers()
self.wfile.write(content)
class Server(Thread):
http_server = None
def __init__(self):
Thread.__init__(self)
address = (settings.server['node_address'], settings.server['node_port'])
self.http_server = NodeServer(address, Handler)
self.daemon = True
self.start()
def run(self):
self.http_server.serve_forever()
def stop(self):
if self.http_server:
self.http_server.shutdown()
self.http_server.socket.close()
return Thread.join(self)
def start():
return Server()