Restructure (P)Config to follow new paradigm

src/Core/PConfig/Model/PConfig.php

@@ -0,0 +1,177 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Core\PConfig\Model;
+
+use Friendica\Core\Config\Model\DbaUtils;
+use Friendica\Database\Database;
+
+/**
+ * The Config model backend for users, which is using the general DB-model backend for user-configs
+ */
+class PConfig
+{
+	/** @var Database */
+	protected $dba;
+
+	/**
+	 * @param Database $dba The database connection of this model
+	 */
+	public function __construct(Database $dba)
+	{
+		$this->dba = $dba;
+	}
+
+	/**
+	 * Checks if the model is currently connected
+	 *
+	 * @return bool
+	 */
+	public function isConnected()
+	{
+		return $this->dba->isConnected();
+	}
+
+	/**
+	 * Loads all configuration values and returns the loaded category as an array.
+	 *
+	 * @param int         $uid The id of the user to load
+	 * @param string|null $cat The category of the configuration values to load
+	 *
+	 * @return array The config array
+	 *
+	 * @throws \Exception In case DB calls are invalid
+	 */
+	public function load(int $uid, string $cat = null)
+	{
+		$return = [];
+
+		if (empty($cat)) {
+			$configs = $this->dba->select('pconfig', ['cat', 'v', 'k'], ['uid' => $uid]);
+		} else {
+			$configs = $this->dba->select('pconfig', ['cat', 'v', 'k'], ['cat' => $cat, 'uid' => $uid]);
+		}
+
+		while ($config = $this->dba->fetch($configs)) {
+			$key   = $config['k'];
+			$value = DbaUtils::toConfigValue($config['v']);
+
+			// just save it in case it is set
+			if (isset($value)) {
+				$return[$config['cat']][$key] = $value;
+			}
+		}
+		$this->dba->close($configs);
+
+		return $return;
+	}
+
+	/**
+	 * Get a particular user config variable out of the DB with the
+	 * given category name ($cat) and a key ($key).
+	 *
+	 * Note: Boolean variables are defined as 0/1 in the database
+	 *
+	 * @param int         $uid The id of the user to load
+	 * @param string $cat The category of the configuration value
+	 * @param string $key The configuration key to query
+	 *
+	 * @return array|string|null Stored value or null if it does not exist
+	 *
+	 * @throws \Exception In case DB calls are invalid
+	 */
+	public function get(int $uid, string $cat, string $key)
+	{
+		if (!$this->isConnected()) {
+			return null;
+		}
+
+		$config = $this->dba->selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+		if ($this->dba->isResult($config)) {
+			$value = DbaUtils::toConfigValue($config['v']);
+
+			// just return it in case it is set
+			if (isset($value)) {
+				return $value;
+			}
+		}
+
+		return null;
+	}
+
+	/**
+	 * Stores a config value ($value) in the category ($cat) under the key ($key) for a
+	 * given user ($uid).
+	 *
+	 * Note: Please do not store booleans - convert to 0/1 integer values!
+	 *
+	 * @param int    $uid   The id of the user to load
+	 * @param string $cat   The category of the configuration value
+	 * @param string $key   The configuration key to set
+	 * @param mixed  $value The value to store
+	 *
+	 * @return bool Operation success
+	 *
+	 * @throws \Exception In case DB calls are invalid
+	 */
+	public function set(int $uid, string $cat, string $key, $value)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		// We store our setting values in a string variable.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$compare_value = (!is_array($value) ? (string)$value : $value);
+		$stored_value  = $this->get($uid, $cat, $key);
+
+		if (isset($stored_value) && ($stored_value === $compare_value)) {
+			return true;
+		}
+
+		$dbvalue = DbaUtils::toDbValue($value);
+
+		$result = $this->dba->update('pconfig', ['v' => $dbvalue], ['uid' => $uid, 'cat' => $cat, 'k' => $key], true);
+
+		return $result;
+	}
+
+	/**
+	 * Removes the configured value of the given user.
+	 *
+	 * @param int    $uid The id of the user to load
+	 * @param string $cat The category of the configuration value
+	 * @param string $key The configuration key to delete
+	 *
+	 * @return bool Operation success
+	 *
+	 * @throws \Exception In case DB calls are invalid
+	 */
+	public function delete(int $uid, string $cat, string $key)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		return $this->dba->delete('pconfig', ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+	}
+}