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(Perl) Google Drive Refresh Access Token

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

Chilkat Perl Downloads

Perl Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

use chilkat();

$success = 1;

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

#  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 = chilkat::CkJsonObject->new();
$tokenFilePath = "qa_data/tokens/googleDrive.json";
$json->LoadFile($tokenFilePath);

$oauth2 = chilkat::CkOAuth2->new();
$oauth2->put_AccessToken($json->stringOf("access_token"));
$oauth2->put_RefreshToken($json->stringOf("refresh_token"));

$rest = chilkat::CkRest->new();

#  Connect using TLS.
$bAutoReconnect = 1;
$success = $rest->Connect("www.googleapis.com",443,1,$bAutoReconnect);

#  Provide the authentication credentials (i.e. the access token)
$rest->SetAuthOAuth2($oauth2);

#  We'll test with a simple request to empty trash.
#  If our access token expired, we'll get a 401 response..
$jsonResponse = $rest->fullRequestNoBody("DELETE","/drive/v3/files/trash");
if ($rest->get_LastMethodSuccess() != 1) {
    print $rest->lastErrorText() . "\r\n";
    exit;
}

#  If the access token expired, we'll get a 401 response status with this response body:
#  {
#   "error": {
#    "errors": [
#     {
#      "domain": "global",
#      "reason": "authError",
#      "message": "Invalid Credentials",
#      "locationType": "header",
#      "location": "Authorization"
#     }
#    ],
#    "code": 401,
#    "message": "Invalid Credentials"
#   }
#  }
if ($rest->get_ResponseStatusCode() == 401) {

    print "Refreshing access token..." . "\r\n";

    $oauth2->put_AuthorizationEndpoint("https://accounts.google.com/o/oauth2/v2/auth");
    $oauth2->put_TokenEndpoint("https://www.googleapis.com/oauth2/v4/token");

    #   Replace these with actual values.
    $oauth2->put_ClientId("GOOGLE-CLIENT-ID");
    $oauth2->put_ClientSecret("GOOGLE-CLIENT-SECRET");
    $oauth2->put_Scope("https://www.googleapis.com/auth/drive");

    #  Use OAuth2 to refresh the access token.
    $success = $oauth2->RefreshAccessToken();
    if ($success != 1) {
        print $oauth2->lastErrorText() . "\r\n";
        exit;
    }

    #  Save the new access token and refresh token to our XML file (so we can refresh it again when needed).
    $json->UpdateString("access_token",$oauth2->accessToken());
    $json->UpdateString("refresh_token",$oauth2->refreshToken());
    $fac = chilkat::CkFileAccess->new();
    $fac->WriteEntireTextFile($tokenFilePath,$json->emit(),"utf-8",0);

    print "Access Token Refreshed!" . "\r\n";

    #  Retry the request with the new access token..
    $jsonResponse = $rest->fullRequestNoBody("DELETE","/drive/v3/files/trash");
    if ($rest->get_LastMethodSuccess() != 1) {
        print $rest->lastErrorText() . "\r\n";
        exit;
    }

}

#  A successful response will have a status code equal to 204 and the response body is empty.
#  (If not successful, then there should be a JSON response body with information..)
if ($rest->get_ResponseStatusCode() != 204) {
    print "response status code = " . $rest->get_ResponseStatusCode() . "\r\n";
    print "response status text = " . $rest->responseStatusText() . "\r\n";
    print "response header: " . $rest->responseHeader() . "\r\n";
    print "response JSON: " . $jsonResponse . "\r\n";
    exit;
}

print "Trash Emptied!" . "\r\n";

 

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