(Tcl) GMail SMTP Send using Previously Obtained OAuth2 Access Token

Demonstrates how to send email using GMail and OAuth2 authentication. This example assumes an OAuth2 access token was previously obtained.

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load ./chilkat.dll

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

# See Get GMail SMTP Access Token 
# for sample code showing how to obtain a GMail SMTP access token for desktop apps.

# In this example, our access token was previously saved to the following file which contains JSON like this:
# 	{
# 	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
# 	 "token_type": "Bearer",
# 	 "expires_in": 3600,
# 	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
# 	}
# 
set json [new_CkJsonObject]

set success [CkJsonObject_LoadFile $json "qa_data/tokens/_gmailSmtp.json"]
if {$success != 1} then {
    puts "Failed to load GMail access token file."
    delete_CkJsonObject $json
    exit
}

set accessToken [CkJsonObject_stringOf $json "access_token"]

set mailman [new_CkMailMan]

# Set the properties for the GMail SMTP server:
CkMailMan_put_SmtpHost $mailman "smtp.gmail.com"
CkMailMan_put_SmtpPort $mailman 587
CkMailMan_put_StartTLS $mailman 1

# The SMTP username should be the GMail address of the user's account that authorized your app to send email.
CkMailMan_put_SmtpUsername $mailman "chilkat.support@gmail.com"
CkMailMan_put_OAuth2AccessToken $mailman $accessToken

# Create a new email object
set email [new_CkEmail]

CkEmail_put_Subject $email "This is a test"
CkEmail_put_Body $email "This is a test"
CkEmail_put_From $email "Chilkat <chilkat.support@gmail.com>"
CkEmail_AddTo $email "Chilkat Admin" "admin@chilkatsoft.com"
# To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

# Call SendEmail to connect to the SMTP server and send.
# The connection (i.e. session) to the SMTP server remains
# open so that subsequent SendEmail calls may use the
# same connection.  
set success [CkMailMan_SendEmail $mailman $email]
if {$success != 1} then {
    puts [CkMailMan_lastErrorText $mailman]
    delete_CkJsonObject $json
    delete_CkMailMan $mailman
    delete_CkEmail $email
    exit
}

# You may close the connection here.  If the connection is kept open, 
# the next call to mailman.SendEmail will continue using the already-established connection
# (and automatically re-connect if needed).
set success [CkMailMan_CloseSmtpConnection $mailman]
if {$success != 1} then {
    puts "Connection to SMTP server not closed cleanly."
}

puts "Email Sent via GMail with OAuth2 authentication."

delete_CkJsonObject $json
delete_CkMailMan $mailman
delete_CkEmail $email