Perl

Refresh GMail IMAP OAuth2 Access Token

See more GMail SMTP/IMAP/POP Examples

Demonstrates how to refresh an access token GMail IMAP read/write access. Perl

use chilkat();

$success = 0;

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

# See Get GMail IMAP OAuth2 Access Token for Desktop App 
# for sample code showing how to obtain a GMail IMAP read/write access token.

# It is assumed we previously obtained an OAuth2 access token for GMail.

$jsonToken = chilkat::CkJsonObject->new();
$success = $jsonToken->LoadFile("qa_data/tokens/_gmailFullAccess.json");
if ($success != 1) {
    print "Failed to load _gmailFullAccess.json" . "\r\n";
    exit;
}

# The access token JSON looks something like this:

# 	{ 
# 	 "access_token": "abac.Ci-ZabcdF37-NUrmSzxbHxTsMbtlN-uPfabcdAQN_2ekzj0s5ofCzRabcdTDMGaa2Q",
# 	 "token_type": "Bearer",
# 	 "expires_in": 3600,
# 	 "refresh_token": "1/lEe5abcdNJ77eOSDBabcdkQGVmDalkwabcdR2Hatbo"
# 	}
# 

$oauth2 = chilkat::CkOAuth2->new();

$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");

# Get the "refresh_token"
$oauth2->put_RefreshToken($jsonToken->stringOf("refresh_token"));

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

print "New access token: " . $oauth2->accessToken() . "\r\n";

# The response contains a new access token, but we must keep
# our existing refresh token for when we need to refresh again in the future.
$jsonToken->UpdateString("access_token",$oauth2->accessToken());

# Save the new JSON access token response to a file.
$sbJson = chilkat::CkStringBuilder->new();
$jsonToken->put_EmitCompact(0);
$jsonToken->EmitSb($sbJson);
$sbJson->WriteFile("qa_data/tokens/_gmailFullAccess.json","utf-8",0);

print "Access token refreshed!" . "\r\n";
print "New Access Token = " . $oauth2->accessToken() . "\r\n";