(Chilkat2-Python) POP3 Auto-Refresh Office365 Access Token

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Demonstrates how to automatically recover from an expired OAuth2 access token when OAuth2 authentication fails in the POP3 protocol. If the server responds with "-ERR Authentication failure: unknown user name or bad password.", then we refresh the access token and retry.

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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.

mailman = chilkat2.MailMan()

mailman.MailHost = "outlook.office365.com"
mailman.MailPort = 995
mailman.PopSsl = True

# Use your O365 email address here.
mailman.PopUsername = "OFFICE365_EMAIL_ADDRESS"

# When using OAuth2 authentication, leave the password empty.
mailman.PopPassword = ""

# Load our previously obtained OAuth2 access token.
jsonToken = chilkat2.JsonObject()
success = jsonToken.LoadFile("qa_data/tokens/office365.json")
if (success == False):
    print(jsonToken.LastErrorText)
    sys.exit()

mailman.OAuth2AccessToken = jsonToken.StringOf("access_token")

# Make the TLS connection to the outlook.office365.com POP3 server.
success = mailman.Pop3Connect()
if (success != True):
    print(mailman.LastErrorText)
    sys.exit()

# Authenticate using XOAUTH2
success = mailman.Pop3Authenticate()
if (success != True):
    # If we're still connected to the mail server, then it means the server sent a non-success response,
    # Such as:  -ERR Authentication failure: unknown user name or bad password.
    if (mailman.IsPop3Connected == True):

        # Refresh the OAuth2 access token, and if successful, save the new (refreshed) access token and try authenticating again.
        oauth2 = chilkat2.OAuth2()

        # Use your actual Directory (tenant) ID instead of "112d7ed6-71bf-4eba-a866-738364321bfc"
        oauth2.TokenEndpoint = "https://login.microsoftonline.com/112d7ed6-71bf-4eba-a866-738364321bfc/oauth2/v2.0/token"

        # Replace these with your Azure App Registration's actual values.
        oauth2.ClientId = "CLIENT_ID"
        oauth2.ClientSecret = "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()

        print("New access token: " + oauth2.AccessToken)
        print("New refresh token: " + oauth2.RefreshToken)

        # Update the JSON with the new tokens.
        jsonToken.UpdateString("access_token",oauth2.AccessToken)
        jsonToken.UpdateString("refresh_token",oauth2.RefreshToken)

        # Save the new JSON access token response to a file.
        sbJson = chilkat2.StringBuilder()
        jsonToken.EmitCompact = False
        jsonToken.EmitSb(sbJson)
        sbJson.WriteFile("qa_data/tokens/office365.json","utf-8",False)

        print("New Access Token = " + oauth2.AccessToken)

        # Update the mailman with the new access token.
        mailman.OAuth2AccessToken = oauth2.AccessToken

        # Retry the authentication.
        success = mailman.Pop3Authenticate()
        if (success == False):
            print(mailman.LastErrorText)
            sys.exit()

    else:
        print(mailman.LastErrorText)
        sys.exit()

# Find out how many emails are on the server..
numEmails = mailman.CheckMail()
if (numEmails < 0):
    print(mailman.LastErrorText)
    sys.exit()

# Examine the POP3 session log:
print(mailman.Pop3SessionLog)

# The POP3 session log will look something like this:

# **** Connected to outlook.office365.com:995
# < +OK The Microsoft Exchange POP3 service is ready. [QwBIADIAUABSADEANgBDAEEAMAAwADEAMgAuAG4AYQBtAHAAcgBkADEANgAuAHAAcgBvAGQALgBvAHUAdABsAG8AbwBrAC4AYwBvAG0A]
# > AUTH XOAUTH2
# < + 
# > <base64 string in XOAUTH2 format>
# < -ERR Authentication failure: unknown user name or bad password.
# > AUTH XOAUTH2
# < + 
# > <base64 string in XOAUTH2 format>
# < +OK User successfully authenticated.
# > STAT
# < +OK 248 46637086

# End the POP3 session and close the connection to the GMail server.
success = mailman.Pop3EndSession()
if (success != True):
    print(mailman.LastErrorText)
    sys.exit()

print("Finished.")