(Chilkat2-Python) Automatically Refresh Token for 401 Unauthorized

Demonstrates how to automatically refresh an access token (without user interaction) when the token expires and a 401 Unauthorized response is received.

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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.

tokenFilePath = "qa_data/tokens/googleCalendar.json"

# Get our current access token.
jsonToken = chilkat2.JsonObject()
success = jsonToken.LoadFile(tokenFilePath)
if (jsonToken.HasMember("access_token") == False):
    print("No access token found.")
    sys.exit()

http = chilkat2.Http()
http.AuthToken = jsonToken.StringOf("access_token")

jsonResponse = http.QuickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList")
if (http.LastMethodSuccess != True):

    if (http.LastStatus != 401):
        print(http.LastErrorText)
        print("----")
        print(http.LastResponseBody)
        sys.exit()

    # The access token must've expired. 
    # Refresh the access token and then retry the request.
    oauth2 = chilkat2.OAuth2()

    oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

    # Replace these with actual values.
    oauth2.ClientId = "GOOGLE-CLIENT-ID"
    oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"

    # Get the "refresh_token"
    oauth2.RefreshToken = jsonToken.StringOf("refresh_token")

    # Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken()
    if (success != True):
        print(oauth2.LastErrorText)
        sys.exit()

    # The response contains a new access token, but we must keep
    # our existing refresh token for when we need to refresh again in the future.
    jsonToken.UpdateString("access_token",oauth2.AccessToken)

    # Save the new JSON access token response to a file.
    sbJson = chilkat2.StringBuilder()
    jsonToken.EmitCompact = False
    jsonToken.EmitSb(sbJson)
    sbJson.WriteFile(tokenFilePath,"utf-8",False)

    print("OAuth2 authorization granted!")
    print("New Access Token = " + oauth2.AccessToken)

    # re-try the original request.
    http.AuthToken = oauth2.AccessToken
    jsonResponse = http.QuickGetStr("https://www.googleapis.com/calendar/v3/users/me/calendarList")
    if (http.LastMethodSuccess != True):
        print(http.LastErrorText)
        sys.exit()

print(jsonResponse)
print("-----------------------------")