(SQL Server) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- 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"
    -- 	}
    -- 
    DECLARE @json int
    -- Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @json, 'LoadFile', @success OUT, 'qa_data/tokens/_gmailSmtp.json'
    IF @success <> 1
      BEGIN

        PRINT 'Failed to load GMail access token file.'
        EXEC @hr = sp_OADestroy @json
        RETURN
      END
    DECLARE @accessToken nvarchar(4000)
    EXEC sp_OAMethod @json, 'StringOf', @accessToken OUT, 'access_token'

    DECLARE @mailman int
    -- Use "Chilkat_9_5_0.MailMan" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.MailMan', @mailman OUT

    -- Set the properties for the GMail SMTP server:
    EXEC sp_OASetProperty @mailman, 'SmtpHost', 'smtp.gmail.com'
    EXEC sp_OASetProperty @mailman, 'SmtpPort', 587
    EXEC sp_OASetProperty @mailman, 'StartTLS', 1

    -- The SMTP username should be the GMail address of the user's account that authorized your app to send email.
    EXEC sp_OASetProperty @mailman, 'SmtpUsername', 'chilkat.support@gmail.com'
    EXEC sp_OASetProperty @mailman, 'OAuth2AccessToken', @accessToken

    -- Create a new email object
    DECLARE @email int
    -- Use "Chilkat_9_5_0.Email" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    EXEC sp_OASetProperty @email, 'Subject', 'This is a test'
    EXEC sp_OASetProperty @email, 'Body', 'This is a test'
    EXEC sp_OASetProperty @email, 'From', 'Chilkat <chilkat.support@gmail.com>'
    EXEC sp_OAMethod @email, 'AddTo', @success OUT, '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.  
    EXEC sp_OAMethod @mailman, 'SendEmail', @success OUT, @email
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @mailman
        EXEC @hr = sp_OADestroy @email
        RETURN
      END

    -- 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).
    EXEC sp_OAMethod @mailman, 'CloseSmtpConnection', @success OUT
    IF @success <> 1
      BEGIN

        PRINT 'Connection to SMTP server not closed cleanly.'
      END


    PRINT 'Email Sent via GMail with OAuth2 authentication.'

    EXEC @hr = sp_OADestroy @json
    EXEC @hr = sp_OADestroy @mailman
    EXEC @hr = sp_OADestroy @email


END
GO