• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Location Publishing

    November 22nd, 2011
    gps, latitude, logging, tech  [html]
    Since I now have a phone with gps and internet, I thought I should write something to log my location, for potential future data analysis. It turns out this already exists, implemented by google latitude among others. I just had to tell google maps on my phone "join latitude" and enable historical logging in the settings, and I was all set. Pulling the gps data out again is a bit of a pain, and required jumping through several steps [1] of server side oauth2, similar to what I had to do to set up pulling in facebook comments, but now I have "Current GPS Location: Home" on my main page [2]. I think it's good practice not to rely on privacy, so it doesn't bother me that people can see where I am all the time.

    Update 2011-11-23: Two people have said a worry is that public location data makes you more vulnerable to theft. My thought is that there are already multiple ways to tell if someone is home: lights, car, watching the door, looking in the window, calling the house phone and seeing if anyone answers. None of these are that reliable, and neither is this one: there might be other people who live in the house as well.


    [1] If you're interested in technical details, I had to:

    1. once: get a client_id from the api console.
    2. once: request a server side code:
            firefox https://accounts.google.com/o/oauth2/auth
              ?scope=https://www.googleapis.com/auth/latitude.all.best
              &redirect_uri=[redirect uri set up in api console]
              &response_type=code
              &client_id=[client id from api console]
              &access_type=offline
            
    3. once: request a refresh token using the code:
            curl -d "code=[code from url previous step redirected to]
              &client_id=[same client id from api console]
              &client_secret=[client secret from api console]
              &redirect_uri=[same redirect uri set up in api console]
              &grant_type=authorization_code"
              https://accounts.google.com/o/oauth2/token
            
    4. every time: request an access token, using the refresh token:
            token_url = "https://accounts.google.com/o/oauth2/token"
            post_body = urllib.urlencode({
              "refresh_token": REFRESH_TOKEN,
              "client_id": CLIENT_ID,
              "client_secret": CLIENT_SECRET,
              "grant_type": "refresh_token"})
            r = urllib2.urlopen(urllib2.Request(token_url, post_body)).read()
            access_token = json.loads(r)["access_token"]
            
    5. every time: request the data from the api:
            url = 'https://www.googleapis.com/latitude/v1/currentLocation?granularity=best'
            headers = { "Authorization": "OAuth " + access_token }
            r = urllib2.urlopen(urllib2.Request(url, None, headers)).read()
            d = json.loads(r)["data"]
            lat, lng = d["latitude"], d["longitude"]
            

    This setup makes a lot of sense if you're making something automated that lots of people will need to go through. It doesn't make much sense if you're making something for use just by the developer; it's no more secure than just "sign up, get key, use key".

    [2] If you want to do something automated, I also made a raw feed

    Comment via: google plus, facebook

    Recent posts on blogs I like:

    Fireside Friday: January 1, 2021

    Happy New Year! Good riddance 2020! Fireside this week. Next week, we’ll be finishing up our look at the Dothraki of A Song of Ice and Fire and Game of Thrones by looking at how they are shown to fight and comparing that to the fighting patterns of actual…

    via A Collection of Unmitigated Pedantry January 1, 2021

    Streets Before Trust

    There’s an emerging mentality among left-wing urban planners in the US called “trust before streets.” It’s a terrible idea that should disappear, a culmination of about 50 or 60 years of learned helplessness in the American public sector. Too many people …

    via Pedestrian Observations January 1, 2021

    Systems design explains the world: volume 1

    "Systems design" is a branch of study that tries to find universal architectural patterns that are valid across disciplines. You might think that's not a possibility. Back in university, students used to tease the Systems Design Engineers, ca…

    via apenwarr December 29, 2020

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact