B4X

POP3 GMail XOAUTH2 Authentication

See more GMail SMTP/IMAP/POP Examples

Demonstrates using OAuth2 authentication with pop.gmail.com.

Note: This example requires Chilkat v9.5.0.83 or greater.

B4X

Dim success As Boolean = False

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

Dim mailman As ChilkatMailMan
mailman.Initialize("mailman")

mailman.MailHost = "pop.gmail.com"
mailman.MailPort = 995
mailman.PopSsl = True

mailman.PopUsername = "my_account@gmail.com"

'  If using OAuth2 authentication, leave the password empty.
mailman.PopPassword = ""

'  Load our previously obtained OAuth2 access token.
'  See Getting a GMail POP3 OAuth2 Access Token
Dim jsonToken As ChilkatJsonObject
jsonToken.Initialize
success = jsonToken.LoadFile("qa_data/tokens/gmail_pop3.json")
If success = False Then
    Log(jsonToken.LastErrorText)
    Return
End If


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

'  Make the TLS connection to the POP3 server.
success = mailman.Pop3Connect
If success <> True Then
    Log(mailman.LastErrorText)
    Return
End If


'  Authenticate..
success = mailman.Pop3Authenticate
If success <> True Then
    Log(mailman.LastErrorText)
    Return
End If


'  Find out how many emails are on the server..
Dim numEmails As Int = mailman.CheckMail
If numEmails < 0 Then
    Log(mailman.LastErrorText)
    Return
End If


'  Examine the POP3 session log:
Log(mailman.Pop3SessionLog)

'  The POP3 session log will look something like this:

'  **** Connected to pop.gmail.com:995
'  < +OK Gpop ready for requests from 87.9.200.42 l16mb86351205iok
'  > AUTH XOAUTH2 dXNlcj1....VaMDJFAQE=
'  < +OK Welcome.
'  > STAT
'  < +OK 301 1627357
'  
'  -- Finished.

'  End the POP3 session and close the connection to the GMail server.
success = mailman.Pop3EndSession
If success <> True Then
    Log(mailman.LastErrorText)
    Return
End If


Log("-- Finished.")