Verify Facebook Access Token for specific App

Question

I need to verify that users on my iPhone app are actually logged in to my Facebook app. I\'m able to verify their user id by retrieving it with their Access token:

Answer 1

Here is my implementation in Python 3, implementing a single Facebook Batch Request. This should get you both the APP and USER data that is tied to the user's access_token, in one call.

#Build the batch, and urlencode it
batchRequest = '[{"method":"GET","relative_url":"me"}, {"method":"GET","relative_url":"app"}]'
batchRequestEncoded = urllib.parse.quote_plus(batchRequest)

#Prepare the batch and access_token params
dataParams = 'access_token=%s&batch=%s' % (fb_access_token, batchRequestEncoded)
dataParamsEncoded = dataParams.encode()
fbURL = 'https://graph.facebook.com/'

#This will POST the request
response = urllib.request.urlopen(fbURL, dataParamsEncoded)

#Get the results
data = response.read()
data = json.loads(data.decode("utf-8"))

There is probably a more pythonic way to implement some of the encoding calls I wrote, but I just wanted to show what exactly worked for me.