(Lianja) POP3 GMail XOAUTH2 Authentication

Demonstrates using OAuth2 authentication with pop.gmail.com.

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

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

loMailman = createobject("CkMailMan")

loMailman.MailHost = "pop.gmail.com"
loMailman.MailPort = 995
loMailman.PopSsl = .T.

loMailman.PopUsername = "my_account@gmail.com"

// If using OAuth2 authentication, leave the password empty.
loMailman.PopPassword = ""

// Load our previously obtained OAuth2 access token.
// See Getting a GMail POP3 OAuth2 Access Token
loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/gmail_pop3.json")
if (llSuccess = .F.) then
    ? loJsonToken.LastErrorText
    release loMailman
    release loJsonToken
    return
endif

loMailman.OAuth2AccessToken = loJsonToken.StringOf("access_token")

// Make the TLS connection to the POP3 server.
llSuccess = loMailman.Pop3Connect()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    release loJsonToken
    return
endif

// Authenticate..
llSuccess = loMailman.Pop3Authenticate()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    release loJsonToken
    return
endif

// Find out how many emails are on the server..
lnNumEmails = loMailman.CheckMail()
if (lnNumEmails < 0) then
    ? loMailman.LastErrorText
    release loMailman
    release loJsonToken
    return
endif

// Examine the POP3 session log:
? loMailman.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.
llSuccess = loMailman.Pop3EndSession()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    release loJsonToken
    return
endif

? "-- Finished."


release loMailman
release loJsonToken