Implement sqlauth v2 - support multiple databases, multiple authentication queries, attribute queries selectable based on which authentication query was successful

Author: nathanjrobertson

src/Auth/Source/SQL1Compat.php

@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\Module\sqlauth\Auth\Source;
+
+/**
+ * Simple SQL authentication source
+ *
+ * This class is an example authentication source which authenticates an user
+ * against a SQL database.
+ *
+ * @package SimpleSAMLphp
+ */
+
+class SQL1Compat extends SQL2
+{
+    /**
+     * Constructor for this authentication source.
+     *
+     * @param array $info  Information about this authentication source.
+     * @param array $config  Configuration.
+     */
+    public function __construct(array $info, array $config)
+    {
+        /* Transform SQL (version 1) config to SQL2 config 
+         * Version 1 supported only one database, but multiple queries. The first query was defined
+         * to be the "authentication query", all subsequent queries were "attribute queries".
+         */
+        $v2config = [
+            'sqlauth:SQL2',
+            'databases' => [
+                'default' => [
+                    'dsn' => $config['dsn'],
+                    'username' => $config['username'],
+                    'password' => $config['password'],
+                ]
+            ],
+
+            'auth_queries' => [
+                'default' => [
+                    'database' => 'default',
+                    'query' => is_array($config['query']) ? $config['query'][0] : $config['query'],
+                ]
+            ],
+        ];
+
+        if (array_key_exists('username_regex', $config)) {
+            $v2config['auth_queries']['default']['username_regex'] = $config['username_regex'];
+        }
+
+        if (is_array($config['query']) && count($config['query']) > 1) {
+            $v2config['attr_queries'] = [];
+            for ($i = 1; $i < count($config['query']); $i++) {
+                $v2config['attr_queries']['query' . $i] = [
+                    'database' => 'default',
+                    'query' => $config['query'][$i],
+                ];
+            }
+        }
+
+        parent::__construct($info, $v2config);
+    }
+}