Introduce a configuration manager (not plugged yet)

1 files changed, 363 insertions, 0 deletions

diff --git a/application/config/ConfigManager.php b/application/config/ConfigManager.php
new file mode 100644
index 00000000..dfe9eeb9
--- /dev/null
+++ b/application/config/ConfigManager.php
@@ -0,0 +1,363 @@
+<?php
+
+// FIXME! Namespaces...
+require_once 'ConfigIO.php';
+require_once 'ConfigPhp.php';
+#require_once 'ConfigJson.php';
+
+/**
+ * Class ConfigManager
+ *
+ * Singleton, manages all Shaarli's settings.
+ */
+class ConfigManager
+{
+    /**
+     * @var ConfigManager instance.
+     */
+    protected static $instance = null;
+
+    /**
+     * @var string Config folder.
+     */
+    public static $CONFIG_FILE = 'data/config';
+
+    /**
+     * @var string Flag telling a setting is not found.
+     */
+    protected static $NOT_FOUND = 'NOT_FOUND';
+
+    /**
+     * @var array Loaded config array.
+     */
+    protected $loadedConfig;
+
+    /**
+     * @var ConfigIO implementation instance.
+     */
+    protected $configIO;
+
+    /**
+     * Private constructor: new instances not allowed.
+     */
+    private function __construct() {}
+
+    /**
+     * Cloning isn't allowed either.
+     */
+    private function __clone() {}
+
+    /**
+     * Return existing instance of PluginManager, or create it.
+     *
+     * @return ConfigManager instance.
+     */
+    public static function getInstance()
+    {
+        if (!(self::$instance instanceof self)) {
+            self::$instance = new self();
+            self::$instance->initialize();
+        }
+
+        return self::$instance;
+    }
+
+    /**
+     * Rebuild the loaded config array from config files.
+     */
+    public function reload()
+    {
+        $this->initialize();
+    }
+
+    /**
+     * Initialize loaded conf in ConfigManager.
+     */
+    protected function initialize()
+    {
+        /*if (! file_exists(self::$CONFIG_FILE .'.php')) {
+            $this->configIO = new ConfigJson();
+        } else {
+            $this->configIO = new ConfigPhp();
+        }*/
+        $this->configIO = new ConfigPhp();
+        $this->loadedConfig = $this->configIO->read(self::$CONFIG_FILE);
+        $this->setDefaultValues();
+    }
+
+    /**
+     * Get a setting.
+     *
+     * Supports nested settings with dot separated keys.
+     * Eg. 'config.stuff.option' will find $conf[config][stuff][option],
+     * or in JSON:
+     *   { "config": { "stuff": {"option": "mysetting" } } } }
+     *
+     * @param string $setting Asked setting, keys separated with dots.
+     * @param string $default Default value if not found.
+     *
+     * @return mixed Found setting, or the default value.
+     */
+    public function get($setting, $default = '')
+    {
+        $settings = explode('.', $setting);
+        $value = self::getConfig($settings, $this->loadedConfig);
+        if ($value === self::$NOT_FOUND) {
+            return $default;
+        }
+        return $value;
+    }
+
+    /**
+     * Set a setting, and eventually write it.
+     *
+     * Supports nested settings with dot separated keys.
+     *
+     * @param string $setting    Asked setting, keys separated with dots.
+     * @param string $value      Value to set.
+     * @param bool   $write      Write the new setting in the config file, default false.
+     * @param bool   $isLoggedIn User login state, default false.
+     */
+    public function set($setting, $value, $write = false, $isLoggedIn = false)
+    {
+        $settings = explode('.', $setting);
+        self::setConfig($settings, $value, $this->loadedConfig);
+        if ($write) {
+            $this->write($isLoggedIn);
+        }
+    }
+
+    /**
+     * Check if a settings exists.
+     *
+     * Supports nested settings with dot separated keys.
+     *
+     * @param string $setting    Asked setting, keys separated with dots.
+     *
+     * @return bool true if the setting exists, false otherwise.
+     */
+    public function exists($setting)
+    {
+        $settings = explode('.', $setting);
+        $value = self::getConfig($settings, $this->loadedConfig);
+        if ($value === self::$NOT_FOUND) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Call the config writer.
+     *
+     * @param bool $isLoggedIn User login state.
+     *
+     * @throws MissingFieldConfigException: a mandatory field has not been provided in $conf.
+     * @throws UnauthorizedConfigException: user is not authorize to change configuration.
+     * @throws IOException: an error occurred while writing the new config file.
+     */
+    public function write($isLoggedIn)
+    {
+        // These fields are required in configuration.
+        $mandatoryFields = array(
+            'login', 'hash', 'salt', 'timezone', 'title', 'titleLink',
+            'redirector', 'disablesessionprotection', 'privateLinkByDefault'
+        );
+
+        // Only logged in user can alter config.
+        if (is_file(self::$CONFIG_FILE) && !$isLoggedIn) {
+            throw new UnauthorizedConfigException();
+        }
+
+        // Check that all mandatory fields are provided in $conf.
+        foreach ($mandatoryFields as $field) {
+            if (! $this->exists($field)) {
+                throw new MissingFieldConfigException($field);
+            }
+        }
+
+        $this->configIO->write(self::$CONFIG_FILE, $this->loadedConfig);
+    }
+
+    /**
+     * Get the configuration file path.
+     *
+     * @return string Config file path.
+     */
+    public function getConfigFile()
+    {
+        return self::$CONFIG_FILE . $this->configIO->getExtension();
+    }
+
+    /**
+     * Recursive function which find asked setting in the loaded config.
+     *
+     * @param array $settings Ordered array which contains keys to find.
+     * @param array $conf   Loaded settings, then sub-array.
+     *
+     * @return mixed Found setting or NOT_FOUND flag.
+     */
+    protected static function getConfig($settings, $conf)
+    {
+        if (!is_array($settings) || count($settings) == 0) {
+            return self::$NOT_FOUND;
+        }
+
+        $setting = array_shift($settings);
+        if (!isset($conf[$setting])) {
+            return self::$NOT_FOUND;
+        }
+
+        if (count($settings) > 0) {
+            return self::getConfig($settings, $conf[$setting]);
+        }
+        return $conf[$setting];
+    }
+
+    /**
+     * Recursive function which find asked setting in the loaded config.
+     *
+     * @param array $settings Ordered array which contains keys to find.
+     * @param mixed $value
+     * @param array $conf   Loaded settings, then sub-array.
+     *
+     * @return mixed Found setting or NOT_FOUND flag.
+     */
+    protected static function setConfig($settings, $value, &$conf)
+    {
+        if (!is_array($settings) || count($settings) == 0) {
+            return self::$NOT_FOUND;
+        }
+
+        $setting = array_shift($settings);
+        if (count($settings) > 0) {
+            return self::setConfig($settings, $value, $conf[$setting]);
+        }
+        $conf[$setting] = $value;
+    }
+
+    /**
+     * Set a bunch of default values allowing Shaarli to start without a config file.
+     */
+    protected function setDefaultValues()
+    {
+        // Data subdirectory
+        $this->setEmpty('config.DATADIR', 'data');
+
+        // Main configuration file
+        $this->setEmpty('config.CONFIG_FILE', 'data/config.php');
+
+        // Link datastore
+        $this->setEmpty('config.DATASTORE', 'data/datastore.php');
+
+        // Banned IPs
+        $this->setEmpty('config.IPBANS_FILENAME', 'data/ipbans.php');
+
+        // Processed updates file.
+        $this->setEmpty('config.UPDATES_FILE', 'data/updates.txt');
+
+        // Access log
+        $this->setEmpty('config.LOG_FILE', 'data/log.txt');
+
+        // For updates check of Shaarli
+        $this->setEmpty('config.UPDATECHECK_FILENAME', 'data/lastupdatecheck.txt');
+
+        // Set ENABLE_UPDATECHECK to disabled by default.
+        $this->setEmpty('config.ENABLE_UPDATECHECK', false);
+
+        // RainTPL cache directory (keep the trailing slash!)
+        $this->setEmpty('config.RAINTPL_TMP', 'tmp/');
+        // Raintpl template directory (keep the trailing slash!)
+        $this->setEmpty('config.RAINTPL_TPL', 'tpl/');
+
+        // Thumbnail cache directory
+        $this->setEmpty('config.CACHEDIR', 'cache');
+
+        // Atom & RSS feed cache directory
+        $this->setEmpty('config.PAGECACHE', 'pagecache');
+
+        // Ban IP after this many failures
+        $this->setEmpty('config.BAN_AFTER', 4);
+        // Ban duration for IP address after login failures (in seconds)
+        $this->setEmpty('config.BAN_DURATION', 1800);
+
+        // Feed options
+        // Enable RSS permalinks by default.
+        // This corresponds to the default behavior of shaarli before this was added as an option.
+        $this->setEmpty('config.ENABLE_RSS_PERMALINKS', true);
+        // If true, an extra "ATOM feed" button will be displayed in the toolbar
+        $this->setEmpty('config.SHOW_ATOM', false);
+
+        // Link display options
+        $this->setEmpty('config.HIDE_PUBLIC_LINKS', false);
+        $this->setEmpty('config.HIDE_TIMESTAMPS', false);
+        $this->setEmpty('config.LINKS_PER_PAGE', 20);
+
+        // Open Shaarli (true): anyone can add/edit/delete links without having to login
+        $this->setEmpty('config.OPEN_SHAARLI', false);
+
+        // Thumbnails
+        // Display thumbnails in links
+        $this->setEmpty('config.ENABLE_THUMBNAILS', true);
+        // Store thumbnails in a local cache
+        $this->setEmpty('config.ENABLE_LOCALCACHE', true);
+
+        // Update check frequency for Shaarli. 86400 seconds=24 hours
+        $this->setEmpty('config.UPDATECHECK_BRANCH', 'stable');
+        $this->setEmpty('config.UPDATECHECK_INTERVAL', 86400);
+
+        $this->setEmpty('redirector', '');
+        $this->setEmpty('config.REDIRECTOR_URLENCODE', true);
+
+        // Enabled plugins.
+        $this->setEmpty('config.ENABLED_PLUGINS', array('qrcode'));
+
+        // Initialize plugin parameters array.
+        $this->setEmpty('plugins', array());
+    }
+
+    /**
+     * Set only if the setting does not exists.
+     *
+     * @param string $key   Setting key.
+     * @param mixed  $value Setting value.
+     */
+    protected function setEmpty($key, $value)
+    {
+        if (! $this->exists($key)) {
+            $this->set($key, $value);
+        }
+    }
+}
+
+/**
+ * Exception used if a mandatory field is missing in given configuration.
+ */
+class MissingFieldConfigException extends Exception
+{
+    public $field;
+
+    /**
+     * Construct exception.
+     *
+     * @param string $field field name missing.
+     */
+    public function __construct($field)
+    {
+        $this->field = $field;
+        $this->message = 'Configuration value is required for '. $this->field;
+    }
+}
+
+/**
+ * Exception used if an unauthorized attempt to edit configuration has been made.
+ */
+class UnauthorizedConfigException extends Exception
+{
+    /**
+     * Construct exception.
+     */
+    public function __construct()
+    {
+        $this->message = 'You are not authorized to alter config.';
+    }
+}