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centralHTTPRequest.py
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centralHTTPRequest.py
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"""
The MIT License (MIT)
Copyright © 2018 Jean-Christophe Bos & HC² (www.hc2.fr)
"""
from iotSocketStruct import IoTSocketStruct
from urlUtils import UrlUtils
from binascii import unhexlify
from time import time
import json
class CentralHTTPRequest :
RECV_TIMEOUT = 2
def __init__(self, xAsyncTCPClient, router, sslContext, maxContentLength, maxSecWaitResponse) :
self._xasTCPCli = xAsyncTCPClient
self._router = router
self._maxContentLength = maxContentLength
self._maxSecWaitResponse = maxSecWaitResponse
self._method = None
self._httpVer = None
self._resPath = '/'
self._queryString = ''
self._headers = { }
self._contentType = None
self._contentLength = 0
self._trackingNbr = None
self._resLocations = {
"/acl" : ( 'POST', self._processPOSTACL ),
"/request" : ( 'POST', self._processPOSTRequest )
}
try :
self._xasTCPCli.StartSSLContext(sslContext, True)
except :
self.Close()
return
self._recvLine(self._onFirstLineRecv)
def Close(self) :
self._xasTCPCli.Close()
def _send(self, data) :
return self._xasTCPCli.AsyncSendData(data)
def _sendLine(self, line='') :
return self._send(line.encode('UTF-8') + b'\r\n')
def _recv(self, size, onDataRecv, onDataRecvArg=None) :
self._xasTCPCli.AsyncRecvData(size, onDataRecv, onDataRecvArg, self.RECV_TIMEOUT)
def _recvLine(self, onLineRecv, onLineRecvArg=None) :
self._xasTCPCli.AsyncRecvLine('UTF-8', onLineRecv, onLineRecvArg, self.RECV_TIMEOUT)
def _onFirstLineRecv(self, xAsyncTCPClient, line, arg) :
try :
elements = line.strip().split()
if len(elements) == 3 :
self._method = elements[0].upper()
self._path = elements[1]
self._httpVer = elements[2].upper()
elements = self._path.split('?', 1)
if len(elements) > 0 :
self._resPath = UrlUtils.UnquotePlus(elements[0])
if len(elements) > 1 :
self._queryString = elements[1]
self._recvLine(self._onHeaderLineRecv)
else :
self.Close()
except :
self.Close()
def _onHeaderLineRecv(self, xAsyncTCPClient, line, arg) :
try :
elements = line.strip().split(':', 1)
if len(elements) == 2 :
self._headers[elements[0].strip().lower()] = elements[1].strip()
self._recvLine(self._onHeaderLineRecv)
elif len(elements) == 1 and len(elements[0]) == 0 :
if self._method == 'POST' or self._method == 'PUT' :
self._contentType = self._headers.get("content-type", None)
self._contentLength = int(self._headers.get("content-length", 0))
self._onAllHeadersReaded()
else :
self.Close()
except :
self.Close()
def _onContentRecv(self, xAsyncTCPClient, data, arg) :
content = arg[0] + bytes(data)
remaining = arg[1] - len(data)
if remaining > 0 :
self._recv(None, self._onContentRecv, (content, remaining))
else :
self._resLocations[self._resPath][1](content)
def _onAllHeadersReaded(self) :
if self._checkAuthentication() :
self._resPath = self._resPath.lower()
if self._resPath in self._resLocations :
if self._method == self._resLocations[self._resPath][0] :
if self._contentLength :
if self._contentLength <= self._maxContentLength :
self._recv(None, self._onContentRecv, (b'', self._contentLength))
else :
self._logRefused('REQUEST ENTITY TOO LARGE')
self._sendHTTPResponse(413, '413 : Request Entity Too Large')
else :
self._resLocations[self._resPath][1](None)
else :
self._logRefused('METHOD NOT ALLOWED')
self._sendHTTPResponse(405, '405 : Method Not Allowed')
else :
self._logRefused('NOT FOUND')
self._sendHTTPResponse(404, '404 : Not Found')
else :
self._logRefused('UNAUTHORIZED')
self._sendHTTPResponse(401, '401 : Unauthorized')
def _checkAuthentication(self) :
x = self._headers.get("authorization", None)
if x :
x = x.split()
if len(x) == 2 and x[0].lower() == 'bearer' :
try :
authKey = unhexlify(x[1])
return self._router.CheckCentralAuthKey(authKey)
except :
pass
return False
def _sendHTTPResponse(self, code, content=None, contentType='text/html', charset='UTF-8') :
if self._sendLine('HTTP/1.1 %s' % code) :
if content :
if type(content) == str :
content = content.encode(charset)
self._sendLine('Content-Type: %s; charset=%s' % (contentType, charset))
self._sendLine('Content-Length: %s' % len(content))
self._sendLine('Connection: close')
ok = self._sendLine()
if ok and content :
ok = self._send(content)
self.Close()
return ok
return False
def _sendJSONResponseOK(self, o) :
return self._sendHTTPResponse(200, json.dumps(o), 'application/json')
def SendResponse(self, code, plObject, plFormat) :
return self._sendJSONResponseOK( {
"Code" : code,
"Payload" : plObject,
"Format" : plFormat
} )
def SendResponseErrNoDest(self) :
return self.SendResponse(IoTSocketStruct.RESP_CODE_ERR_NO_DEST, None, 'JSON')
def SendResponseErrTimeout(self) :
return self.SendResponse(IoTSocketStruct.RESP_CODE_ERR_TIMEOUT, None, 'JSON')
def _getJSONContent(self, content) :
if content :
try :
return json.loads(content.decode('UTF-8'))
except :
raise Exception('incorrect json format')
raise Exception('no content')
def _processPOSTACL(self, content) :
try :
o = self._getJSONContent(content)
except Exception as ex :
self._logRefused('BAD REQUEST, %s' % ex)
self._sendHTTPResponse(400, '400 : Bad Request (%s)' % ex)
return
try :
acl = [ ]
ok = True
for ac in o :
groupID = IoTSocketStruct.GroupNameToBin128(ac['GroupName'])
uid = IoTSocketStruct.UIDToBin128(ac['UID'])
authKey = unhexlify(ac['AuthKey'])
if groupID and uid and authKey and len(authKey) == 16 :
acl.append((groupID, uid, authKey))
else :
ok = False
break
if ok :
self._router.ClearACL()
for ac in acl :
self._router.AddACLAccess(*ac)
self._router.SaveACL()
self._log('%s ACL SETUP RECEIVED' % len(acl))
self._sendHTTPResponse(200)
return
except :
pass
self._logRefused('BAD REQUEST, INCORRECT JSON DATA')
self._sendHTTPResponse(400, '400 : Bad Request (incorrect json data)')
def _processPOSTRequest(self, content) :
try :
o = self._getJSONContent(content)
except Exception as ex :
self._logRefused('BAD REQUEST, %s' % ex)
self._sendHTTPResponse(400, '400 : Bad Request (%s)' % ex)
return
try :
uid = IoTSocketStruct.UIDToBin128(o['UID'])
timeout = int(o.get('Timeout', self._maxSecWaitResponse))
fmt, data = IoTSocketStruct.EncodeJSONPayload(o['Payload'], o['Format'])
if uid and timeout > 0 and fmt is not None and data is not None :
if timeout > self._maxSecWaitResponse :
timeout = self._maxSecWaitResponse
exp = time() + timeout
self._trackingNbr = self._router.AddCentralHTTPRequest(self, exp)
strUID = ('{%s}' % IoTSocketStruct.UIDFromBin128(uid))
self._log('REQUEST TO %s RECEIVED (#%s)' % (strUID, self._trackingNbr))
if not self._router.RouteRequest( fromUID = None,
toUID = uid,
trackingNbr = self._trackingNbr,
dataFormat = fmt,
formatOpt = IoTSocketStruct.PLDATA_FMT_OPT_NONE,
data = data ) :
self._router.RemoveCentralHTTPRequest(self)
self.SendResponseErrNoDest()
return
except :
pass
self._logRefused('BAD REQUEST, INCORRECT JSON DATA')
self._sendHTTPResponse(400, '400 : Bad Request (incorrect json data)')
def _log(self, line) :
self._router.Log( 'HTTPS CLIENT %s > %s' %
(self._xasTCPCli.CliAddr[0], line) )
def _logRefused(self, reason) :
self._log('REFUSED (%s)' % reason)
@property
def TrackingNbr(self) :
return self._trackingNbr