(PowerShell) Google Drive Refresh Access Token

Demonstrates how to automatically refresh the access token when it expires.

Chilkat .NET Downloads Chilkat .NET Assemblies

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.

$success = $true

# This example uses a previously obtained access token having permission for the 
# Google Drive scope.

# The access token (and refresh token) was previously saved to a JSON file with this format:
# See Get Google Drive OAuth2 Access Token

# {
#   "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
#   "expires_in": 3600,
#   "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
#   "scope": "https://www.googleapis.com/auth/drive",
#   "token_type": "Bearer"
# }

$json = New-Object Chilkat.JsonObject
$tokenFilePath = "qa_data/tokens/googleDrive.json"
$json.LoadFile($tokenFilePath)

$oauth2 = New-Object Chilkat.OAuth2
$oauth2.AccessToken = $json.StringOf("access_token")
$oauth2.RefreshToken = $json.StringOf("refresh_token")

$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"
$oauth2.Scope = "https://www.googleapis.com/auth/drive"

# Use OAuth2 to refresh the access token.
$success = $oauth2.RefreshAccessToken()
if ($success -ne $true) {
    $($oauth2.LastErrorText)
    exit
}

$($oauth2.AccessTokenResponse)

# Save the new access token to our JSON file (so we can refresh it again when needed).
$json.UpdateString("access_token",$oauth2.AccessToken)

$fac = New-Object Chilkat.FileAccess
$fac.WriteEntireTextFile($tokenFilePath,$json.Emit(),"utf-8",$false)

$("Access Token Refreshed!")