Move Preload/JIT Configuration logic from Adapter to Core-Configuration

src/Model/Config/DbaConfig.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace Friendica\Model\Config;
+
+use Friendica\Database\Database;
+
+abstract class DbaConfig
+{
+	/** @var Database */
+	protected $dba;
+
+	public function __construct(Database $dba)
+	{
+		$this->dba    = $dba;
+	}
+
+	/**
+	 * Checks if the model is currently connected
+	 *
+	 * @return bool
+	 */
+	public function isConnected()
+	{
+		return $this->dba->isConnected();
+	}
+
+	/**
+	 * Formats a DB value to a config value
+	 * - null   = The db-value isn't set
+	 * - bool   = The db-value is either '0' or '1'
+	 * - array  = The db-value is a serialized array
+	 * - string = The db-value is a string
+	 *
+	 * Keep in mind that there aren't any numeric/integer config values in the database
+	 *
+	 * @param null|string $value
+	 *
+	 * @return null|array|string
+	 */
+	protected function toConfigValue($value)
+	{
+		if (!isset($value)) {
+			return null;
+		}
+
+		switch (true) {
+			// manage array value
+			case preg_match("|^a:[0-9]+:{.*}$|s", $value):
+				return unserialize($value);
+
+			default:
+				return $value;
+		}
+	}
+
+	/**
+	 * Formats a config value to a DB value (string)
+	 *
+	 * @param mixed $value
+	 *
+	 * @return string
+	 */
+	protected function toDbValue($value)
+	{
+		// if not set, save an empty string
+		if (!isset($value)) {
+			return '';
+		}
+
+		switch (true) {
+			// manage arrays
+			case is_array($value):
+				return serialize($value);
+
+			default:
+				return (string)$value;
+		}
+	}
+}