Update v1.3

gatewayNode/parking.py

@@ -14,11 +14,14 @@ with open('/home/pi/project/data.json', 'r') as json_file:
 if json_data != "" and json_data != None:
 	server_par = json.loads(json_data.replace('\n','').replace(' ',''))
 	
+	# Initialize server IP and Port to make the connection.
 	server_ip = server_par['ip']
 	server_port = server_par['port']
 	
 	if server_ip != None and server_port != None:
 		API_ENDPOINT = 'http://' + server_ip + ':' + server_port + '/parkingStatus'
+		
+		# Initialize Serial Connection with Arduino Uno
 		ser = serial.Serial(
 			port='/dev/ttyACM0',
 			baudrate = 9600,
@@ -32,28 +35,47 @@ if json_data != "" and json_data != None:
 		ser.readline()
 		prev_status = "-1"
 		
-		device_session = requests.session()
+		# Authentication body content.
 		data = """{"username" :""" + server_par['username'] + """, "password":""" + server_par['password'] + """, "device": """ + server_par['device'] + """}"""
 		
-		s.post(url = API_ENDPOINT, data = data)
-        while 1:
-            park_status = ser.readline()
-            park_status_data = str(park_status).split("#")
-
-            parkingCode = park_status_data[0].replace('b\'','')
-            parkingStatus = park_status_data[1].replace('\\r\\n\'', '')
-            
-            try:
-                if parkingStatus != prev_status:
-                    data = """{"no":""" + parkingCode + ""","status":""" + parkingStatus + """}"""
-                    r = s.post(url = API_ENDPOINT, data = data)
-                    if parkingStatus == "0":
-                        print("parking reserved. RESPONSE :", r.status_code, "\n")
-                    elif parkingStatus == "1":
-                        print("parking not reserved. RESPONSE : ", r.status_code, "\n")
-            except NameError as e:
-                print("**Not already prev variable. <Error> : ", str(e), "\n")
-            prev_status = parkingStatus
-    else:
-        print("Create a *.json configuration like: {'ip' : 'xxx.xxx.xxx.xxx', 'port': 'xxxx'}")
+		# Request to Authenticate Node.
+		resp = requests.post(url = API_ENDPOINT, data = data)
+		
+		# Unpack our data to a JSON object
+		data = json.loads(resp.content)
+		try:
+			# Check if node is Authenticated. "cookie
+			if data['cookie'] != None:
+				while 1:
+					# For a while we request to get Parking Status
+					#	witch is a JSON object like [{"no": 1, "status": false}, {"no": 2, "status": true}, ..., {"no": n, "status": true}]
+					park_status = ser.readline()
+					
+					# Substring the input data from arduino.
+					#	Data's notation is: <parking_no>#<parking_status>
+					park_status_data = str(park_status).split("#")
+					
+					# Decode and clear serial input data encoding.
+					parkingCode = park_status_data[0].replace('b\'','')
+					parkingStatus = park_status_data[1].replace('\\r\\n\'', '')
+					
+					try:
+						if parkingStatus != prev_status:
+							# If parking status changed from previous status
+							#	server would informed about this change.
+							data = """{"no":""" + parkingCode + ""","status":""" + parkingStatus + """}"""
+							r = s.post(url = API_ENDPOINT, data = data)
+							
+							# IO : node prints to output the current 
+							if parkingStatus == "0":
+								print("parking reserved. RESPONSE :", r.status_code, "\n")
+							elif parkingStatus == "1":
+								print("parking not reserved. RESPONSE : ", r.status_code, "\n")
+					except NameError as e:
+						print("**Not already prev variable. <Error> : ", str(e), "\n")
+					prev_status = parkingStatus
+		except TypeError as e:
+			print("Node must be authenticate first.")
+	else:
+		print("Create a *.json configuration like: {'ip' : 'xxx.xxx.xxx.xxx', 'port': 'xxxx'}")
 

serverNode/serv.py

@@ -1,13 +1,14 @@
 #Authors:   Oulis Evangelos, Oulis Nikolaos, Drosos Katsibras
 #===================================================================
 # using flask restful
-from flask import Flask, request, jsonify, session
+from flask import Flask, request, jsonify
 from flask_restful import Resource, Api
 from json import dumps
 import json
 from flask_cors import CORS
 import mysql.connector
-import os
+from base64 import b64encode
+from os import urandom
 
 # ==================================================================
 # ==================================================================
@@ -16,8 +17,8 @@ import os
 app = Flask(__name__)
 CORS(app)
 
-# create the secret key for session
-app.secret_key = os.urandom(24)
+# Session list
+sessions = []
 
 # creating an API object
 api = Api(app)
@@ -65,10 +66,13 @@ def isMember(username, password):
 
 # Function that return if the requested user is authenticated
 # 	or not (True / False).
-def isAuthenticated():
-	if 'device_id' in session:
-		return True
-	else:
+def isAuthenticated(data):
+	try:
+		if data['cookie'] in sessions:
+			return True
+		else:
+			return False
+	except KeyError as e:
 		return False
 
 
@@ -77,6 +81,8 @@ def isAuthenticated():
 # the get, post methods correspond to get and post requests 
 # they are automatically mapped by flask_restful. 
 # other methods include put, delete, etc.
+
+# Resource that returns th whole parking status in a JSON
 class Parking(Resource):
 	def get(self):
 		parks = None
@@ -87,6 +93,7 @@ class Parking(Resource):
 		
 		return parks, 200
 
+# Update parking status resource from authenticated only Node
 class ParkingStatus(Resource):
 	def get(self):
 		return """<html>
@@ -94,10 +101,9 @@ class ParkingStatus(Resource):
 			<body><h1>Not get at '/parkingStatus'.</h1></body>
 			</html>"""
 	def post(self):
-		if isAuthenticated():
-			# Gets the data into as a JSON Object from HTTP request.
-			data = json.loads(request.data)
-			
+		# Gets the data into as a JSON Object from HTTP request.
+		data = json.loads(request.data)
+		if isAuthenticated(data):
 			try:
 				# SQL get all Parking places status.
 				parks = getParkings()
@@ -138,13 +144,14 @@ class ParkingStatus(Resource):
 					myCursor.execute("UPDATE PARKING SET PARKING_STATUS=%s WHERE PARKING_CODE=%s", values)
 					mydb.commit()
 					parks = getParkings()
-			except mysql.connector.errors.DatabaseError as e:
+			except (mysql.connector.errors.DatabaseError, mysql.connector.errors.InterfaceError) as e:
 				mydb.reconnect(attempts=1, delay=0)
 			
 			return currentParking, 201
 		else:
 			return "Error! You aren't authenticated. [POST] /authenticate first.", 403
 
+# Authentication resource.
 class Authenticate(Resource):
 	def post(self):
 		try:
@@ -155,22 +162,28 @@ class Authenticate(Resource):
 				isValid = isMember(data['username'], data['password'])
 				
 				if isValid:
-					session['device_id'] = data['device']
+					session_key = str(b64encode(urandom(32)).decode('utf-8'))
+					
+					# Send the cookie value back to clinet.
+					session = {"cookie": session_key}
+					sessions.append(session_key)
+					return session, 200
 				else:
 					return "Not Authenticatiove device", 403
 			else:
 				return "Error authentication", 403
-		except mysql.connector.errors.DatabaseError as e:
+		except (mysql.connector.errors.DatabaseError, mysql.connector.errors.InterfaceError) as e:
 				mydb.reconnect(attempts=1, delay=0)
 
 # ==================================================================
-# adding the defined resources along with their corresponding urls to REST APIs 
+# matches the defined resources to their corresponding urls to REST APIs 
 api.add_resource(Parking, '/')
 api.add_resource(ParkingStatus, '/parkingStatus')
 api.add_resource(Authenticate, '/authenticate')
 
 # ==================================================================
-# driver function
+# ===========================MAIN CLASS=============================
+# driver function "Main Class"
 if __name__ == '__main__':
     app.run(
             debug=True,