AuthorizationHelperForGraph.php
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<?php
// A class that provides authortization token for apps that need to access Azure Active Directory Graph Service.
class AuthorizationHelperForAADGraphService
{
// Post the token generated from the symettric key and other information to STS URL and construct the authentication header
public static function getAuthenticationHeader(){
// Password
$appTenantDomainName = Settings::getAppTenantDomainName();
$appPrincipalId = Settings::getAppPrincipalId();
$appObjectId = Settings::getAppObjectId();
$password = Settings::getPassword();
$clientSecret = urlencode($password);
// Information about the resource we need access for which in this case is graph.
$graphId = '00000002-0000-0000-c000-000000000000';
$protectedResourceHostName = 'graph.windows.net';
$graphPrincipalId = urlencode($graphId.'/'.$protectedResourceHostName.'@'.$appTenantDomainName);
// Information about the app
$clientPrincipalId = urlencode($appPrincipalId.'@'.$appTenantDomainName);
// Construct the body for the STS request
$authenticationRequestBody = 'grant_type=client_credentials&client_secret='.$clientSecret
.'&'.'resource='.$graphPrincipalId.'&'.'client_id='.$clientPrincipalId;
//Using curl to post the information to STS and get back the authentication response
$ch = curl_init();
// set url
$stsUrl = 'https://accounts.accesscontrol.windows.net/tokens/OAuth/2';
curl_setopt($ch, CURLOPT_URL, $stsUrl);
// Get the response back as a string
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
// Mark as Post request
curl_setopt($ch, CURLOPT_POST, 1);
// Set the parameters for the request
curl_setopt($ch, CURLOPT_POSTFIELDS, $authenticationRequestBody);
// By default, HTTPS does not work with curl.
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
//curl_setopt($ch, CURLOPT_PROXY, '127.0.0.1:8888');
// read the output from the post request
$output = curl_exec($ch);
// close curl resource to free up system resources
curl_close($ch);
// decode the response from sts using json decoder
$tokenOutput = json_decode($output);
//error_log(print_r($tokenOutput, true));
if($tokenOutput->error){
$response = 'fail';
return array( $response ,$tokenOutput->error);
}
return 'Authorization:' . $tokenOutput->{'token_type'}.' '.$tokenOutput->{'access_token'};
}
}
?>