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(PowerShell) Refresh GMail SMTP OAuth2 Access TokenDemonstrates how to refresh an access token for sending email via GMail (SMTP).
Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.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. # It is assumed we previously obtained an OAuth2 access token for GMail (one with a scope for sending email). $jsonToken = New-Object Chilkat.JsonObject $success = $jsonToken.LoadFile("qa_data/tokens/_gmailSmtp.json") if ($success -ne $true) { $("Failed to load _gmailSmtp.json") exit } # The access token JSON looks something like this: # { # "access_token": "abac.Ci-ZabcdF37-NUrmSzxbHxTsMbtlN-uPfabcdAQN_2ekzj0s5ofCzRabcdTDMGaa2Q", # "token_type": "Bearer", # "expires_in": 3600, # "refresh_token": "1/lEe5abcdNJ77eOSDBabcdkQGVmDalkwabcdR2Hatbo" # } # $oauth2 = New-Object Chilkat.OAuth2 $oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token" # Replace these with actual values. $oauth2.ClientId = "GOOGLE-CLIENT-ID" $oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET" # Get the "refresh_token" $oauth2.RefreshToken = $jsonToken.StringOf("refresh_token") # Send the HTTP POST to refresh the access token.. $success = $oauth2.RefreshAccessToken() if ($success -ne $true) { $($oauth2.LastErrorText) exit } # The response contains a new access token, but we must keep # our existing refresh token for when we need to refresh again in the future. $jsonToken.UpdateString("access_token",$oauth2.AccessToken) # Save the new JSON access token response to a file. $sbJson = New-Object Chilkat.StringBuilder $jsonToken.EmitCompact = $false $jsonToken.EmitSb($sbJson) $sbJson.WriteFile("qa_data/tokens/_gmailSmtp.json","utf-8",$false) $("OAuth2 authorization granted!") $("New Access Token = " + $oauth2.AccessToken) |
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