(PHP ActiveX) Refresh Expiring OAuth2 Access Token for Azure Registered App

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Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// We previously obtained an access token and saved the JSON to a file using this example:
// Get OAuth2 Access Token for Azure Registered App

// This example will examine the JSON and expiration date, and if near expiration will
// refresh the access token.

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject')
$json = new COM("Chilkat.JsonObject");
$success = $json->LoadFile('qa_data/tokens/_myAzureApp.json');
if ($success != 1) {
    print 'Failed to load the access token.' . "\n";
    exit;
}

// The contents of the JSON look like this:
// {
//   "token_type": "Bearer",
//   "scope": "User.Read Mail.ReadWrite Mail.Send",
//   "expires_in": 3600,
//   "ext_expires_in": 0,
//   "access_token": "EwBAA8l6B...",
//   "refresh_token": "MCRMdbe6Cd...",
//   "id_token": "eyJ0eXAiOiJ...",
//   "expires_on": "1494112119"
// }

// The "expires_on" value is a Unix time.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.CkDateTime')
$dtExpire = new COM("Chilkat.CkDateTime");
$dtExpire->SetFromUnixTime(0,$json->IntOf('expires_on'));

// If this date/time expires within 10 minutes of the current system time, refresh the token.
if ($dtExpire->ExpiresWithin(10,'minutes') != 1) {
    print 'No need to refresh, the access token won't expire within the next 10 minutes.' . "\n";
    exit;
}

// OK, we need to refresh the access token..
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.OAuth2')
$oauth2 = new COM("Chilkat.OAuth2");

// Note: The endpoint depends on the Azure App Registration.
// See How to Choose the Correct Endpoints for your Azure App Registration
$oauth2->TokenEndpoint = 'https://login.microsoftonline.com/common/oauth2/v2.0/token';

// Use your client ID.
$oauth2->ClientId = 'CLIENT_ID';

// Get the existing refresh token.
$oauth2->RefreshToken = $json->stringOf('refresh_token');

// Send the HTTP POST to refresh the access token.
$success = $oauth2->RefreshAccessToken();
if ($success == 0) {
    print $oauth2->LastErrorText . "\n";
    exit;
}

print 'OAuth2 authorization granted!' . "\n";
print 'Access Token = ' . $oauth2->AccessToken . "\n";

// Get the full JSON response:
$json->Load($oauth2->AccessTokenResponse);
$json->EmitCompact = 0;

// If an "expires_on" member does not exist, then add the JSON member by
// getting the current system date/time and adding the "expires_in" seconds.
// This way we'll know when the token expires.
if ($json->HasMember('expires_on') != 1) {
    $dtExpire->SetFromCurrentSystemTime();
    $dtExpire->AddSeconds($json->IntOf('expires_in'));
    $json->AppendString('expires_on',$dtExpire->getAsUnixTimeStr(0));
}

print $json->emit() . "\n";

// Save the new access token JSON to a file for future requests.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.FileAccess')
$fac = new COM("Chilkat.FileAccess");
$fac->WriteEntireTextFile('qa_data/tokens/_myAzureApp.json',$json->emit(),'utf-8',0);

?>