(Chilkat2-Python) Get Google API Access Token using JSON Private Key

Demonstrates how to get a Google API access token using a JSON service account private key.

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import sys
import chilkat2

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# First load the JSON key into a string.
fac = chilkat2.FileAccess()
jsonKey = fac.ReadEntireTextFile("qa_data/googleApi/ChilkatTest-ab2ecd52ef98.json","utf-8")
if (fac.LastMethodSuccess != True):
    print(fac.LastErrorText)
    sys.exit()

# A JSON private key should look like this:

# 	{
# 	  "type": "service_account",
# 	  "project_id": "chilkattest-1350",
# 	  "private_key_id": "fa2e36ee26986eab628b59868af8bec1d1c64c38",
# 	  "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvgIjFa...28N64N2n1E4FYzBZjSdy\n-----END PRIVATE KEY-----\n",
# 	  "client_email": "598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a@developer.gserviceaccount.com",
# 	  "client_id": "598922945226-00rb0ppfg0snd9jo7bhvd4v17jtj2d3a.apps.googleusercontent.com",
# 	  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
# 	  "token_uri": "https://accounts.google.com/o/oauth2/token",
# 	  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
# 	  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a%40developer.gserviceaccount.com"
# 	}

gAuth = chilkat2.AuthGoogle()
gAuth.JsonKey = jsonKey

# Choose a scope.
gAuth.Scope = "https://www.googleapis.com/auth/cloud-platform"

# Request an access token that is valid for this many seconds.
gAuth.ExpireNumSeconds = 3600

# If the application is requesting delegated access:
# The email address of the user for which the application is requesting delegated access,
# then set the email address here. (Otherwise leave it empty.)
gAuth.SubEmailAddress = ""

# Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
# The Chilkat socket object is used so that the connection can be established
# through proxies or an SSH tunnel if desired.
tlsSock = chilkat2.Socket()
success = tlsSock.Connect("www.googleapis.com",443,True,5000)
if (success != True):
    print(tlsSock.LastErrorText)
    sys.exit()

# Send the request to obtain the access token.
success = gAuth.ObtainAccessToken(tlsSock)
if (success != True):
    print(gAuth.LastErrorText)
    sys.exit()

# Examine the access token:
print("Access Token: " + gAuth.AccessToken)