Created
September 17, 2013 19:56
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Hack used in pythonista to read the device geolocation info.
This version adds some error handling, and the ability to control the geo location service options ( see http://diveintohtml5.info/geolocation.html )
The fake http protocol is very crude, it may be a better opttion to use python's BaseHTTPServer.
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| import socket | |
| import webbrowser | |
| import datetime | |
| import json | |
| from collections import namedtuple | |
| class GeoLocationError(Exception): | |
| def __init__(self, code, message): | |
| self.code = code | |
| self.message = message | |
| def __str__(self): | |
| return 'code={}, msg={}'.format(self.code, self.message) | |
| LocationInfo = namedtuple('LocationInfo', 'longitude latitude accuracy altitude altitudeAccuracy heading speed timestamp') | |
| html = """ | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script> | |
| function returnToPythonista() { | |
| window.open('pythonista://', '_self', ''); | |
| window.setTimeout(function () { | |
| window.close(); | |
| },0); | |
| } | |
| var xhr = new XMLHttpRequest(); | |
| xhr.addEventListener("loadend", function () { | |
| window.setTimeout(returnToPythonista,0); | |
| }, false); | |
| xhr.open('POST', '/', true); | |
| function sendPosition(position) { | |
| xhr.send(JSON.stringify([false, position])); | |
| } | |
| function handleError(positionError) { | |
| xhr.send(JSON.stringify([true, positionError])); | |
| } | |
| options = %s; | |
| navigator.geolocation.getCurrentPosition(sendPosition, handleError, options); | |
| </script> | |
| </head> | |
| <body> | |
| <h1>Wait...</h1> | |
| </body> | |
| </html> | |
| """ | |
| def get_location(port=3050, enableHighAccuracy=False, timeout=5000, maximumAge=0): | |
| s = socket.socket() | |
| s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | |
| s.bind( ('127.0.0.1', port) ) | |
| s.listen(1) | |
| def send(data): | |
| s2, addrinfo = s.accept() | |
| resp = s2.recv(2048) | |
| body_len = None | |
| for line in resp.splitlines(): | |
| if line.startswith('Content-Length'): | |
| body_len = int(line.split(':')[1]) | |
| if body_len is not None: | |
| body_start = resp.index('\r\n\r\n')+4 | |
| buf = resp[body_start:] | |
| resp = buf + s2.recv(body_len-len(buf)) | |
| else: | |
| resp = '' | |
| s2.send("\r\n".join(("HTTP/1.0 200 OK", "Content-Type: text/html", "Content-Length: {}".format(len(data)), "", data))) | |
| s2.close() | |
| return resp | |
| webbrowser.open('safari-http://localhost:{}/'.format(port)) | |
| # Send html page on first connection | |
| options = dict(enableHighAccuracy=enableHighAccuracy, timeout=timeout, maximumAge=maximumAge) | |
| send(html % json.dumps(options)) | |
| # Send empty page, we are only interested in POST data | |
| data = send("") | |
| s.close() | |
| error, info = json.loads(data) | |
| if error: | |
| raise GeoLocationError(**info) | |
| timestamp = datetime.datetime.fromtimestamp(info['timestamp']/1000.0) | |
| return LocationInfo(timestamp=timestamp, **info['coords']) | |
| if __name__ == '__main__': | |
| try: | |
| loc = get_location(enableHighAccuracy=False) | |
| print 'loc: ', loc | |
| except GeoLocationError as error: | |
| print 'failed: ', error.message |
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