openmedialibrary/oml/node/server.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from socketserver import ThreadingMixIn
from threading import Thread
import base64
import gzip
import hashlib
import http.server
import io
import json
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import os
import socket
import socketserver
import time
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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
)
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import db
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import settings
import state
import user
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from changelog import changelog_size, changelog_path
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from websocket import trigger_event
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from . import nodeapi
from .sslsocket import fileobject
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import logging
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logger = logging.getLogger(__name__)
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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)
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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()
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def shutdown_request(self, request):
try:
request.shutdown()
except:
pass
class NodeServer(ThreadingMixIn, TLSTCPServer):
_running = True
allow_reuse_address = True
def api_call(action, user_id, args):
with db.session():
u = user.models.User.get(user_id)
if action in (
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'requestPeering', 'acceptPeering', 'rejectPeering',
'removePeering', 'cancelPeering'
) 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)',
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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 log_message(self, format, *args):
if settings.DEBUG_HTTP:
logger.debug("%s - - [%s] %s\n", self.address_string(),
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self.log_date_time_string(), format % args)
def do_HEAD(self):
return self.do_GET()
def do_GET(self):
import item.models
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parts = self.path.split('/')
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if len(parts) == 3 and parts[1] in ('get', 'preview'):
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id = parts[2]
preview = parts[1] == 'preview'
else:
id = None
if id and len(id) == 32 and id.isalnum():
with db.session():
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if preview:
from item.icons import get_icon_sync
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try:
data = get_icon_sync(id, 'preview', 512)
except:
data = None
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if data:
self.send_response(200, 'ok')
self.send_header('Content-type', 'image/jpg')
else:
self.send_response(404, 'Not Found')
self.send_header('Content-type', 'text/plain')
data = b'404 - Not Found'
content_length = len(data)
self.send_header('Content-Length', str(content_length))
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self.end_headers()
self.write_with_limit(data, content_length)
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return
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file = item.models.File.get(id)
if not file:
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 = file.fullpath()
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)
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if mimetype == 'text/plain':
with open(path, 'rb') as f:
content = f.read()
content = self.gzip_data(content)
content_length = len(content)
else:
content = None
content_length = os.path.getsize(path)
self.send_header('Content-Length', str(content_length))
self.end_headers()
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if content:
self.write_with_limit(content, content_length)
else:
self.write_file_with_limit(path, content_length)
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elif len(parts) == 2 and parts[1] == 'log':
self._changelog()
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())
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def _denied(self):
self.send_response(403, 'denied')
self.end_headers()
def _changelog(self):
x509 = self.connection.get_peer_certificate()
user_id = get_service_id(x509.get_pubkey()) if x509 else None
with db.session():
u = user.models.User.get(user_id)
if not u:
return self._denied()
if u.pending:
logger.debug('ignore request from pending peer[%s] %s (%s)',
user_id, action, args)
return self._denied()
if not u.peered and u.pending == 'sent':
u.update_peering(True)
state.nodes.queue('add', u.id, True)
trigger_event('peering.accept', u.json())
if not u.peered:
return self._denied()
path = changelog_path()
content_length = changelog_size()
with open(path, 'rb') as log:
request_range = self.headers.get('Range', '')
if request_range:
r = request_range.split('=')[-1].split('-')
start = int(r[0])
end = int(r[1]) if r[1] else (content_length - 1)
if start == content_length:
content_length = 0
else:
content_length = end - start + 1
if content_length < 0:
content_length = os.path.getsize(path)
self.send_response(200, 'OK')
else:
log.seek(start)
self.send_response(206, 'OK')
else:
self.send_response(200, 'OK')
self.send_header('Content-type', 'text/json')
self.send_header('X-Node-Protocol', settings.NODE_PROTOCOL)
self.send_header('Content-Length', str(content_length))
self.end_headers()
self.write_fd_with_limit(log, content_length)
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
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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
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def do_POST(self):
'''
API
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:
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logger.debug('invalid request', exc_info=True)
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',
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self.headers.get('X-Node-Protocol', ''), settings.NODE_PROTOCOL)
logger.debug('headers %s', self.headers)
content = settings.release
else:
try:
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action, args = json.loads(data.decode('utf-8'))
except:
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logger.debug('invalid data: %s', data, exc_info=True)
response_status = (500, 'invalid request')
content = {
'status': 'invalid request'
}
self.write_response(response_status, content)
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return
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logger.debug('%s requests %s%s', user_id, action, args)
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 = {}
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#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)
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content_length = len(content)
self.send_header('Content-Length', str(content_length))
self.end_headers()
self.wfile.write(content)
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logger.debug('%s bytes response', content_length)
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def chunk_size(self, content_length):
return min(16*1024, content_length)
def write_with_limit(self, content, content_length):
chunk_size = self.chunk_size(content_length)
position = 0
while position < content_length:
if state.bandwidth:
while not state.bandwidth.upload(chunk_size) and self.server._running:
time.sleep(0.1)
data = content[position:position+chunk_size]
self.wfile.write(data)
position += chunk_size
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def write_fd_with_limit(self, f, content_length):
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chunk_size = self.chunk_size(content_length)
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position = 0
while True:
data = f.read(chunk_size)
if not data:
break
self.wfile.write(data)
position += chunk_size
if position + chunk_size > content_length:
chunk_size = content_length - position
if chunk_size <= 0:
break
if state.bandwidth:
while not state.bandwidth.upload(chunk_size) and self.server._running:
time.sleep(0.1)
def write_file_with_limit(self, path, content_length):
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with open(path, 'rb') as f:
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self.write_fd_with_limit(f, content_length)
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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._running = False
self.http_server.shutdown()
self.http_server.socket.close()
return Thread.join(self)
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def start():
return Server()