Added process filter for logging info about login

Created by: BaranekD

lib/Auth/Process/LoginInfo.php

+<?php
+
+namespace SimpleSAML\Module\perun\Auth\Process;
+
+use SimpleSAML\Auth\ProcessingFilter;
+use SimpleSAML\Configuration;
+use SimpleSAML\Logger;
+
+class LoginInfo extends ProcessingFilter
+{
+    const ATTRS = 'attrs';
+    const SOURCE_IDP_ATTR = 'sourceIdPAttr';
+    const SOURCE_IDENTIFIER_ATTR = 'sourceIdentifierAttr';
+
+    private $attrs;
+    private $sourceIdpAttr;
+    private $sourceIdentifierAttr;
+
+    public function __construct($config, $reserved)
+    {
+        parent::__construct($config, $reserved);
+        $config = Configuration::loadFromArray($config);
+        $this->attrs = $config->getArray(self::ATTRS);
+        $this->sourceIdpAttr = $config->getString(self::SOURCE_IDP_ATTR, '');
+        $this->sourceIdentifierAttr = $config->getString(self::SOURCE_IDENTIFIER_ATTR, '');
+    }
+
+    public function process(&$request)
+    {
+        $spEntityId = $request['SPMetadata']['entityid'];
+
+        $finalString = 'User ';
+
+        if (isset($request['perun']['user'])) {
+            $user = $request['perun']['user'];
+            $finalString .= 'ID: ' . $user->getId() . ', ';
+        }
+
+        if (!empty($this->attrs)) {
+            $finalString .= 'identifiers: [';
+
+            foreach ($this->attrs as $attr) {
+                if (isset($request['Attributes'][$attr][0])) {
+                    $finalString .= $attr . ': ' . $request['Attributes'][$attr][0] . ', ';
+                }
+            }
+
+            $finalString = substr($finalString, 0, -2) . '], ';
+        }
+
+        $finalString .= 'service: ' . $spEntityId;
+
+        if (!empty($this->sourceIdentifierAttr) && isset($request['Attributes'][$this->sourceIdentifierAttr][0])) {
+            $finalString .= ', external identity: ' . $request['Attributes'][$this->sourceIdentifierAttr][0];
+            if (!empty($this->sourceIdpAttr) && isset($request['Attributes'][$this->sourceIdpAttr][0])) {
+                $finalString .= ' from ' . $request['Attributes'][$this->sourceIdpAttr][0];
+            }
+        }
+
+        Logger::notice($finalString);
+    }
+}