add wifi -> location api example

contrib/geolocate.py

@@ -0,0 +1,43 @@
+#!/usr/bin/python
+
+import requests
+import subprocess
+
+# doku: https://developers.google.com/maps/documentation/geolocation/intro#wifi_access_point_object
+
+"""
+r = requests.post("https://www.googleapis.com/geolocation/v1/geolocate", params={"key": "AIzaSyDwr302FpOSkGRpLlUpPThNTDPbXcIn_FM"}, json={
+    "wifiAccessPoints": [
+        {
+            "macAddress": "10-fe-ed-af-43-44",
+            "signalStrength": 100
+        },
+        {
+            "macAddress": "02-ca-ff-ee-ba-be",
+            "signalStrength": 100
+        }
+	]
+})
+print(r.text)
+"""
+
+networks = []
+
+o = subprocess.check_output(["iwlist", "wlan0", "scanning"])
+ls = o.decode("UTF-8").split("          Cell")
+for wifi in ls[1:]:
+	for field in wifi.split("\n"):
+		if "Address:" in field:
+			mac = field.split("Address: ")[1]
+		elif "Signal level=" in field:
+			signal_strength = field.split("Signal level=")[1].split(" dBm")[0]
+	print("%s -> %s" % (mac, signal_strength))
+	networks.append({"macAddress": mac, "signalStrength": signal_strength})
+
+r = requests.post("https://www.googleapis.com/geolocation/v1/geolocate",
+	params={"key": "AIzaSyDwr302FpOSkGRpLlUpPThNTDPbXcIn_FM"},
+	json={"wifiAccessPoints": networks}
+)
+
+print({"wifiAccessPoints": networks})
+print(r.text)