Add Auth Db backend

example/data/sqlite.init-db.sql

@@ -1,3 +1,15 @@
+CREATE TABLE users (
+    username text NOT NULL PRIMARY KEY,
+    name text COLLATE NOCASE NOT NULL,
+    mail text COLLATE NOCASE,
+    password text NOT NULL
+);
+
+INSERT INTO users (username, name, mail, password) VALUES (
+  "admin", "Administrator", "admin@example.com",
+  "$argon2id$v=19$m=65536,t=4,p=1$WTQ0di44NW11MUJ1b3RMQw$+LRAQRaIXE2jhfavNFNuxnEtEUT6tEBz/98pTtD0EnM"
+);
+
 CREATE TABLE item (
     id INTEGER PRIMARY KEY,
     name text COLLATE NOCASE NOT NULL,

src/Auth/Db.php

@@ -0,0 +1,144 @@
+<?php
+
+namespace EesyPHP\Auth;
+
+use EesyPHP\App;
+use EesyPHP\Db as DbConnection;
+use EesyPHP\Log;
+
+use Exception;
+
+class Db extends Backend {
+
+  /**
+   * Database connection object
+   * @var \EesyPHP\Db|null
+   */
+  private static $db = null;
+
+  /**
+   * Database connection parameters
+   */
+
+  /**
+   * @var string
+   */
+  private static $dsn;
+
+  /**
+   * @var string|null
+   */
+  private static $user;
+
+  /**
+   * @var string|null
+   */
+  private static $password;
+
+  /**
+   * @var array
+   */
+  private static $options;
+
+  /**
+   * Users table name
+   * @var string
+   */
+  private static $users_table;
+
+  /**
+   * Username field name
+   * @var string
+   */
+  private static $username_field;
+
+  /**
+   * Password field name
+   * @var string
+   */
+  private static $password_field;
+
+  /**
+   * List of Db fields exposed in User object
+   * @var array
+   */
+  private static $exposed_fields;
+
+  /**
+   * Initialize
+   * @return boolean
+   */
+  public static function init() {
+    self :: $dsn = App::get('auth.db.dsn', null, 'string');
+    self :: $user = App::get('auth.db.user', null, 'string');
+    self :: $password = App::get('auth.db.password', null, 'string');
+    self :: $options = App::get('auth.db.options', array(), 'array');
+    self :: $users_table = App::get('auth.db.users_table', 'users', 'string');
+    self :: $username_field = App::get('auth.db.username_field', 'username', 'string');
+    self :: $password_field = App::get('auth.db.password_field', 'password', 'string');
+    self :: $exposed_fields = App::get('auth.db.exposed_fields', array('name', 'mail'), 'array');
+    return boolval(self :: $dsn);
+  }
+
+  /**
+   * Connect to database
+   * @return void
+   */
+  private static function connect() {
+    if (!self :: $db)
+      self :: $db = new DbConnection(
+        self :: $dsn, self :: $user, self :: $password, self :: $options
+      );
+  }
+
+  /**
+   * Retreive a user by its username
+   * @param string $username
+   * @return \EesyPHP\Auth\User|null|false The user object if found, null it not, false in case of error
+   */
+  public static function get_user($username) {
+    self :: connect();
+    try {
+      $query = self :: $db -> fpdo -> from(self :: $users_table)
+        -> select(null)
+        -> select(self :: $exposed_fields)
+        -> where(self :: $username_field, $username);
+
+      $result = $query -> execute();
+      $info = $result -> fetch();
+      if ($info === false)
+        return null;
+      return new User($username, '\\EesyPHP\\Auth\\Db', $info);
+    }
+    catch (Exception $e) {
+      Log :: error("Error retreiving user %s info from database: %s", $username, $e->getMessage());
+    }
+    return false;
+  }
+
+  /**
+   * Check a user password
+   * @param \EesyPHP\Auth\User $user The user object
+   * @param string $password The password to check
+   * @return boolean
+   */
+  public static function check_password($user, $password) {
+    self :: connect();
+    try {
+      $query = self :: $db -> fpdo -> from(self :: $users_table)
+        -> select(null)
+        -> select(self :: $password_field)
+        -> where(self :: $username_field, $user->username);
+
+      $result = $query -> execute();
+      $info = $result -> fetch();
+      if ($info === false)
+        return false;
+      return password_verify($password, $info['password']);
+    }
+    catch (Exception $e) {
+      Log :: error("Error retreiving user %s password from database: %s", $user, $e->getMessage());
+    }
+    return false;
+  }
+}