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(PowerShell) Google OAuth2 Access Token

Demonstrates how to get a Google OAuth2 access token from a desktop application or script.

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[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

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

$oauth2 = New-Object Chilkat.OAuth2

#  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"

$oauth2.CodeChallenge = $true
$oauth2.CodeChallengeMethod = "S256"

#  This is the scope for Google Drive.
#  See https://developers.google.com/identity/protocols/googlescopes
$oauth2.Scope = "https://www.googleapis.com/auth/drive"

#  Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
$url = $oauth2.StartAuth()
if ($oauth2.LastMethodSuccess -ne $true) {
    $($oauth2.LastErrorText)
    exit
}

#  At this point, your application should load the URL in a browser.
#  For example,
#  in C#:  System.Diagnostics.Process.Start(url);
#  in Java: Desktop.getDesktop().browse(new URI(url));
#  in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
#               wsh.Run url
#  The Google account owner would interactively accept or deny the authorization request.

#  Add the code to load the url in a web browser here...
#  Add the code to load the url in a web browser here...
#  Add the code to load the url in a web browser here...

#  Now wait for the authorization.
#  We'll wait for a max of 30 seconds.
$numMsWaited = 0
while (($numMsWaited -lt 30000) -and ($oauth2.AuthFlowState -lt 3)) {
    $oauth2.SleepMs(100)
    $numMsWaited = $numMsWaited + 100
}

#  If there was no response from the browser within 30 seconds, then
#  the AuthFlowState will be equal to 1 or 2.
#  1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
#  2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
#  In that case, cancel the background task started in the call to StartAuth.
if ($oauth2.AuthFlowState -lt 3) {
    $oauth2.Cancel()
    $("No response from the browser!")
    exit
}

#  Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
#  The possible AuthFlowState values are:
#  3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
#  4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
#  5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
if ($oauth2.AuthFlowState -eq 5) {
    $("OAuth2 failed to complete.")
    $($oauth2.FailureInfo)
    exit
}

if ($oauth2.AuthFlowState -eq 4) {
    $("OAuth2 authorization was denied.")
    $($oauth2.AccessTokenResponse)
    exit
}

if ($oauth2.AuthFlowState -ne 3) {
    $("Unexpected AuthFlowState:" + $oauth2.AuthFlowState)
    exit
}

#  Save the full JSON access token response to a file.
$sbJson = New-Object Chilkat.StringBuilder
$sbJson.Append($oauth2.AccessTokenResponse)
$sbJson.WriteFile("qa_data/tokens/googleDrive.json","utf-8",$false)

#  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"
#  	}
# 
$("OAuth2 authorization granted!")
$("Access Token = " + $oauth2.AccessToken)

 

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