(Perl) 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 Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# 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 = chilkat::CkFileAccess->new();
$jsonKey = $fac->readEntireTextFile("qa_data/googleSvcAccountKeys/ChilkatCloud-48f7737c7505.json","utf-8");
if ($fac->get_LastMethodSuccess() != 1) {
    print $fac->lastErrorText() . "\r\n";
    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 = chilkat::CkAuthGoogle->new();
$gAuth->put_JsonKey($jsonKey);

# Choose the scope for read/write access.
$gAuth->put_Scope("https://www.googleapis.com/auth/tasks");

# Request an access token that is valid for this many seconds.
$gAuth->put_ExpireNumSeconds(3600);

$gAuth->put_SubEmailAddress("");

# Connect to www.googleapis.com using TLS
$tlsSock = chilkat::CkSocket->new();
$success = $tlsSock->Connect("www.googleapis.com",443,1,5000);
if ($success != 1) {
    print $tlsSock->lastErrorText() . "\r\n";
    exit;
}

# Send the request to obtain the access token.
$success = $gAuth->ObtainAccessToken($tlsSock);
if ($success != 1) {
    print $gAuth->lastErrorText() . "\r\n";
    exit;
}

# Examine the access token:
print "Access Token: " . $gAuth->accessToken() . "\r\n";

# Save our access token to a file.
$success = $fac->WriteEntireTextFile("qa_data/tokens/googleTasks.txt",$gAuth->accessToken(),"utf-8",0);