(PowerShell) Get Access Token for Google Tasks using Service Account JSON Key

Demonstrates how to get an access token for the Google Tasks API using a Service Account JSON key.

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.

# First load the JSON key into a string.
$fac = New-Object Chilkat.FileAccess
$jsonKey = $fac.ReadEntireTextFile("qa_data/googleSvcAccountKeys/ChilkatCloud-48f7737c7505.json","utf-8")
if ($fac.LastMethodSuccess -ne $true) {
    $($fac.LastErrorText)
    exit
}

# A JSON private key should look like this:

# {
#   "type": "service_account",
#   "project_id": "chilkatcloud",
#   "private_key_id": "48f7737c7505bb88eee6a20d09993e10605d466e",
#   "private_key": "-----BEGIN PRIVATE KEY----- ... -----END PRIVATE KEY-----\n",
#   "client_email": "pip-564@chilkatcloud.iam.gserviceaccount.com",
#   "client_id": "109982228323456925225",
#   "auth_uri": "https://accounts.google.com/o/oauth2/auth",
#   "token_uri": "https://oauth2.googleapis.com/token",
#   "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
#   "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/pip-564%40chilkatcloud.iam.gserviceaccount.com"
# }

$gAuth = New-Object Chilkat.AuthGoogle
$gAuth.JsonKey = $jsonKey

# Choose the scope for read/write access.
$gAuth.Scope = "https://www.googleapis.com/auth/tasks"

# Request an access token that is valid for this many seconds.
$gAuth.ExpireNumSeconds = 3600

$gAuth.SubEmailAddress = ""

# Connect to www.googleapis.com using TLS
$tlsSock = New-Object Chilkat.Socket
$success = $tlsSock.Connect("www.googleapis.com",443,$true,5000)
if ($success -ne $true) {
    $($tlsSock.LastErrorText)
    exit
}

# Send the request to obtain the access token.
$success = $gAuth.ObtainAccessToken($tlsSock)
if ($success -ne $true) {
    $($gAuth.LastErrorText)
    exit
}

# Examine the access token:
$("Access Token: " + $gAuth.AccessToken)

# Save our access token to a file.
$success = $fac.WriteEntireTextFile("qa_data/tokens/googleTasks.txt",$gAuth.AccessToken,"utf-8",$false)