Chilkat2-Python

Facebook OAuth2 Access Token

See more Facebook Examples

Demonstrates how to get a Facebook OAuth2 access token from a desktop application or script. Chilkat2-Python

import sys
import chilkat2

success = False

# To further clarify, see OAuth 2.0 Authorization Flow

oauth2 = chilkat2.OAuth2()

# This should match the Site URL configured for your Facebook APP, such as "http://localhost:3017/"
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://www.facebook.com/dialog/oauth"
oauth2.TokenEndpoint = "https://graph.facebook.com/oauth/access_token"

# Replace this with your actual App ID
oauth2.ClientId = "APP_ID"

# Set the Scope to a comma-separated list of permissions the app wishes to request.
# See https://developers.facebook.com/docs/facebook-login/permissions/ for a full list of permissions.
oauth2.Scope = "public_profile,user_friends,email,user_posts,user_likes,user_photos"

# This is for Require Proof Key for Code Exchange (PKCE)
# See OAuth2 PKCE Explained
oauth2.CodeChallenge = True
oauth2.CodeChallengeMethod = "S256"

# Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
url = oauth2.StartAuth()
if (oauth2.LastMethodSuccess != True):
    print(oauth2.LastErrorText)
    sys.exit()

print("url = " + url)

# Launch the default browser on the system and navigate to the url.
# The LaunchBrowser method was added in Chilkat v10.1.2.
success = oauth2.LaunchBrowser(url)
if (success == False):
    print(oauth2.LastErrorText)
    sys.exit()

# Wait for the user to approve or deny authorization in the browser.
numMsWaited = 0
while (numMsWaited < 90000) and (oauth2.AuthFlowState < 3) :
    oauth2.SleepMs(100)
    numMsWaited = numMsWaited + 100

# If the browser does not respond within the specified time, AuthFlowState will be:
# 
# 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
# 2: Waiting for Final Response – The thread is awaiting the final access token response.
# In either case, cancel the background task initiated by StartAuth.

if (oauth2.AuthFlowState < 3):
    oauth2.Cancel()
    print("No response from the browser!")
    sys.exit()

# Check AuthFlowState to determine if authorization was granted, denied, or failed:
# 
# 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
# 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
# 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if (oauth2.AuthFlowState == 5):
    print("OAuth2 failed to complete.")
    print(oauth2.FailureInfo)
    sys.exit()

if (oauth2.AuthFlowState == 4):
    print("OAuth2 authorization was denied.")
    print(oauth2.AccessTokenResponse)
    sys.exit()

if (oauth2.AuthFlowState != 3):
    print("Unexpected AuthFlowState:" + str(oauth2.AuthFlowState))
    sys.exit()

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