First commit

server/frontend/app/classes/device.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import json
+import os
+import re
+
+
+class Device(object):
+
+    def __init__(self, token):
+        self.token = token if re.match(r"[A-F0-9]{8}", token) else None
+        return None
+
+    def get(self):
+        """
+            Get the device properties (such as Mac address, name, IP etc.)
+            By reading the device.json file if exists. Or reading
+            the leases files and writing the result into device.json. 
+
+            :return: dict containing device properties.
+        """
+        if not os.path.isfile("/tmp/{}/device.json".format(self.token)):
+            device = self.read_leases()
+            if device["status"] != False:
+                with open("/tmp/{}/device.json".format(self.token), "w") as f:
+                    f.write(json.dumps(device))
+        else:
+            with open("/tmp/{}/device.json".format(self.token)) as f:
+                device = json.load(f)
+        return device
+
+    @staticmethod
+    def read_leases():
+        """
+            Read the DNSMasq leases files to retrieve
+            the connected device properties. 
+
+            :return: dict containing device properties.
+        """
+        with open("/var/lib/misc/dnsmasq.leases") as f:
+            for line in f.readlines():
+                return {
+                    "status": True,
+                    "name": line.split(" ")[3],
+                    "ip_address": line.split(" ")[2],
+                    "mac_address": line.split(" ")[1],
+                    "timestamp": int(line.split(" ")[0])
+                }
+            else:
+                return {"status": False,
+                        "message": "Device not connected"}