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(Visual Basic 6.0) Get GMail SMTP OAuth2 Access Token for Desktop AppSee more OAuth2 ExamplesThis example show how to obtain a Gmail SMTP OAuth2 access token from a desktop application or script, enabling the use of XOAUTH2 authentication.Note: This example requires Chilkat v10.1.2 or greater.
' To further clarify, see OAuth 2.0 Authorization Flow Dim oauth2 As New ChilkatOAuth2 ' For Google OAuth2, set the listen port equal to the port used ' in the Authorized Redirect URL for the Client ID. ' For example, in this case the Authorized Redirect URL would be http://localhost:55568/ ' Your app should choose a port not likely not used by any other application. oauth2.ListenPort = 55568 oauth2.AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth" oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token" ' Replace these with actual values. oauth2.ClientId = "GOOGLE-CLIENT-ID" oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET" ' To use Gmail's OAuth2 for sending emails via the SMTP protocol, you need to request the https://mail.google.com/ scope. ' See About GMail SMTP OAuth2 Scopes oauth2.Scope = "https://mail.google.com/" ' Begin the OAuth2 Authorization code flow. This returns a URL that should be loaded in a browser. Dim url As String url = oauth2.StartAuth() If (oauth2.LastMethodSuccess <> 1) Then Debug.Print oauth2.LastErrorText Exit Sub End If ' Launch the default browser on the system and navigate to the url. ' The LaunchBrowser method was added in Chilkat v10.1.2. Dim success As Long success = oauth2.LaunchBrowser(url) If (success = 0) Then Debug.Print oauth2.LastErrorText Exit Sub End If ' Wait for the user to approve or deny authorization in the browser. Dim numMsWaited As Long numMsWaited = 0 Do While (numMsWaited < 90000) And (oauth2.AuthFlowState < 3) oauth2.SleepMs 100 numMsWaited = numMsWaited + 100 Loop ' If the browser does not respond within the specified time, AuthFlowState will be: ' ' 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request. ' 2: Waiting for Final Response – The thread is awaiting the final access token response. ' In either case, cancel the background task initiated by StartAuth. If (oauth2.AuthFlowState < 3) Then success = oauth2.Cancel() Debug.Print "No response from the browser!" Exit Sub End If ' Check AuthFlowState to determine if authorization was granted, denied, or failed: ' ' 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse. ' 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse. ' 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo. If (oauth2.AuthFlowState = 5) Then Debug.Print "OAuth2 failed to complete." Debug.Print oauth2.FailureInfo Exit Sub End If If (oauth2.AuthFlowState = 4) Then Debug.Print "OAuth2 authorization was denied." Debug.Print oauth2.AccessTokenResponse Exit Sub End If If (oauth2.AuthFlowState <> 3) Then Debug.Print "Unexpected AuthFlowState:" & oauth2.AuthFlowState Exit Sub End If ' Save the full JSON access token response to a file. Dim sbJson As New ChilkatStringBuilder success = sbJson.Append(oauth2.AccessTokenResponse) success = sbJson.WriteFile("qa_data/tokens/_gmailSmtp.json","utf-8",0) ' The saved JSON response looks like this: ' { ' "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ", ' "token_type": "Bearer", ' "expires_in": 3600, ' "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c" ' } ' Debug.Print "OAuth2 authorization granted!" Debug.Print "Access Token = " & oauth2.AccessToken |
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