/
mjs.py
308 lines (230 loc) · 8.82 KB
/
mjs.py
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# -*- coding: utf-8 -*-
from http import server, cookies
import socketserver
import json
import datetime
import traceback
import logging
import mapper
LOGGER = logging.getLogger(__name__)
class _RequestHandler(server.BaseHTTPRequestHandler):
_mpr = None
_status_code = None
_message = None
_cookie = None
_payload = None
def do_GET(self):
if not self._validate():
return
try:
resp = self.server._mpr.call(url=self.path, method='GET',
args={'headers': self.headers})
except Exception as e:
traceback.print_exc()
self._send_error(e)
return
if resp:
self._handle_mapper_response(resp)
self.send_response(self._status_code, self._message)
self.send_header('Content-type', 'application/json')
self._send_default_headers()
self.end_headers()
if self._payload is not None:
self.wfile.write(bytes(json.dumps(
self._payload, default=self._serialize), 'utf-8'))
else:
self.wfile.write(bytes(json.dumps([]), 'utf-8'))
else:
self.send_response(400)
self._send_default_headers()
self.end_headers()
def do_POST(self):
if not self._validate():
return
content_length = int(self.headers['Content-Length'])
try:
data = self.rfile.read(content_length).decode('utf-8')
if data:
data = json.loads(data)
else:
data = {}
except Exception as e:
traceback.print_exc()
self._send_error('Received invalid json')
return
try:
resp = self.server._mpr.call(
url=self.path, method='POST',
args={'headers': self.headers, 'payload': data})
except Exception as e:
traceback.print_exc()
self._send_error(e)
return
if resp:
self._handle_mapper_response(resp)
self.send_response(self._status_code, self._message)
self.send_header('Content-type', 'application/json')
self._send_default_headers()
if self._cookie:
self.send_header('Set-Cookie', self._cookie.output(header=''))
self.end_headers()
else:
self.send_response(400)
self._send_default_headers()
self.end_headers()
def do_PUT(self):
if not self._validate():
return
content_length = int(self.headers['Content-Length'])
try:
data = json.loads(self.rfile.read(content_length).decode('utf-8'))
except Exception as e:
traceback.print_exc()
self._send_error('Received invalid json')
return
try:
resp = self.server._mpr.call(
url=self.path, method='PUT',
args={'headers': self.headers, 'payload': data})
except Exception as e:
traceback.print_exc()
self._send_error(e)
return
if resp:
self._handle_mapper_response(resp)
self.send_response(self._status_code, self._message)
else:
self.send_response(400)
self._send_default_headers()
self.end_headers()
def do_DELETE(self):
if not self._validate():
return
try:
resp = self.server._mpr.call(url=self.path, method='DELETE',
args={'headers': self.headers})
except Exception as e:
traceback.print_exc()
self._send_error(e)
return
if resp:
self._handle_mapper_response(resp)
self.send_response(self._status_code, self._message)
else:
self.send_response(400)
self._send_default_headers()
self.end_headers()
def do_OPTIONS(self):
self.send_response(200)
self._send_default_headers()
self.send_header('Access-Control-Allow-Methods',
'GET, POST, PUT, DELETE')
self.send_header('Access-Control-Allow-Headers', 'Content-Type')
self.end_headers()
def _serialize(self, obj):
if isinstance(obj, datetime.datetime):
serial = obj.isoformat()
return serial
def _validate(self):
_validator = self.server._validator
_validator_excludes = self.server._validator_excludes
if not _validator:
return True
if _validator_excludes:
if self.path in _validator_excludes:
return True
try:
valid = _validator(self.path, self.headers)
except Exception as e:
traceback.print_exc()
self._send_error(e)
return False
if not valid:
self.send_response(401)
self._send_default_headers()
self.end_headers()
return False
return True
def _get_cookies(self):
cookie = self.headers.get('Cookie')
if not cookie:
return None
return cookies.BaseCookie(cookie)
def _handle_mapper_response(self, response):
self._status_code = response['status_code']
self._message = response['message'] if 'message' in response else ''
self._cookie = response['cookie'] if 'cookie' in response else None
self._payload = response['payload'] if 'payload' in response else None
def _send_error(self, error_message):
self.send_response(500, error_message)
self.send_header('Content-type', 'text/plain')
self._send_default_headers()
self.end_headers()
def _send_default_headers(self):
if self.server._access_control_allow_origin:
if 'Origin' in self.headers:
self.send_header('Access-Control-Allow-Origin',
self.headers['Origin'])
else:
self.send_header('Access-Control-Allow-Origin', '*')
allow = str(self.server._access_control_allow_credentials).lower()
self.send_header('Access-Control-Allow-Credentials', allow)
def log_message(self, format, *args):
LOGGER.info(format % args)
class Config(object):
"""Config to be passed to the Server
Attributes:
address (str): The address to be used by the server.
port (int): The port to be used by the server.
incl_access_control_allow_origin (bool): Determines if
'Access-Control-Allow-Origin' should be includedin the servers
response header or not.
incl_access_control_allow_credentials (bool): Determines if
'Access-Control-Allow-Credentials' should be set to 'true' or
'false' in the servers response header.
validate_callback (function): A callback which will be called for
EVERY request (GET, POST, PUT, DELETE) BEFORE the actual resolved
function will be called.
This callback HAS to return either True (if the request is
allowed), or False (if the request is NOT allowed)
Usefully to implement e.g. authentication
validate_exclude_paths (list): A list of url-paths (without host:port)
to be excluded from validation.
e.g. ['/login', '/register']
mapper_name (str): Name of the mapper instance to use. Don't change
to use the default.
"""
address = '0.0.0.0'
port = 8088
incl_access_control_allow_origin = False
incl_access_control_allow_credentials = False
validate_callback = None
validate_exclude_paths = None
mapper_name = None
class Server(server.HTTPServer):
_validator = None
_validator_excludes = None
_access_control_allow_origin = None
_access_control_allow_credentials = None
_mpr = None
def __init__(self, conf):
"""Constructor to initialize the server
Args:
conf (Config): configuration for this server instance
"""
self._validator = conf.validate_callback
self._validator_excludes = conf.validate_exclude_paths
self._access_control_allow_origin = (
conf.incl_access_control_allow_origin)
self._access_control_allow_credentials = (
conf.incl_access_control_allow_credentials)
if conf.mapper_name:
self._mpr = mapper.Mapper.get(conf.mapper_name)
else:
self._mpr = mapper.Mapper.get()
super(Server, self).__init__((conf.address, conf.port),
_RequestHandler)
class ThreadedServer(socketserver.ThreadingMixIn, Server):
"""Like `Server` but implements `socketserver.ThreadingMixIn` to
handle request with multiple threads"""
pass