1 files changed, 103 insertions, 0 deletions
diff --git a/wp-includes/Requests/src/Hooks.php b/wp-includes/Requests/src/Hooks.php
new file mode 100644
index 0000000..d8023ed
--- /dev/null
+++ b/wp-includes/Requests/src/Hooks.php
@@ -0,0 +1,103 @@
+<?php
+/**
+ * Handles adding and dispatching events
+ *
+ * @package Requests\EventDispatcher
+ */
+
+namespace WpOrg\Requests;
+
+use WpOrg\Requests\Exception\InvalidArgument;
+use WpOrg\Requests\HookManager;
+use WpOrg\Requests\Utility\InputValidator;
+
+/**
+ * Handles adding and dispatching events
+ *
+ * @package Requests\EventDispatcher
+ */
+class Hooks implements HookManager {
+	/**
+	 * Registered callbacks for each hook
+	 *
+	 * @var array
+	 */
+	protected $hooks = [];
+
+	/**
+	 * Register a callback for a hook
+	 *
+	 * @param string $hook Hook name
+	 * @param callable $callback Function/method to call on event
+	 * @param int $priority Priority number. <0 is executed earlier, >0 is executed later
+	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $hook argument is not a string.
+	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $callback argument is not callable.
+	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $priority argument is not an integer.
+	 */
+	public function register($hook, $callback, $priority = 0) {
+		if (is_string($hook) === false) {
+			throw InvalidArgument::create(1, '$hook', 'string', gettype($hook));
+		}
+
+		if (is_callable($callback) === false) {
+			throw InvalidArgument::create(2, '$callback', 'callable', gettype($callback));
+		}
+
+		if (InputValidator::is_numeric_array_key($priority) === false) {
+			throw InvalidArgument::create(3, '$priority', 'integer', gettype($priority));
+		}
+
+		if (!isset($this->hooks[$hook])) {
+			$this->hooks[$hook] = [
+				$priority => [],
+			];
+		} elseif (!isset($this->hooks[$hook][$priority])) {
+			$this->hooks[$hook][$priority] = [];
+		}
+
+		$this->hooks[$hook][$priority][] = $callback;
+	}
+
+	/**
+	 * Dispatch a message
+	 *
+	 * @param string $hook Hook name
+	 * @param array $parameters Parameters to pass to callbacks
+	 * @return boolean Successfulness
+	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $hook argument is not a string.
+	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $parameters argument is not an array.
+	 */
+	public function dispatch($hook, $parameters = []) {
+		if (is_string($hook) === false) {
+			throw InvalidArgument::create(1, '$hook', 'string', gettype($hook));
+		}
+
+		// Check strictly against array, as Array* objects don't work in combination with `call_user_func_array()`.
+		if (is_array($parameters) === false) {
+			throw InvalidArgument::create(2, '$parameters', 'array', gettype($parameters));
+		}
+
+		if (empty($this->hooks[$hook])) {
+			return false;
+		}
+
+		if (!empty($parameters)) {
+			// Strip potential keys from the array to prevent them being interpreted as parameter names in PHP 8.0.
+			$parameters = array_values($parameters);
+		}
+
+		ksort($this->hooks[$hook]);
+
+		foreach ($this->hooks[$hook] as $priority => $hooked) {
+			foreach ($hooked as $callback) {
+				$callback(...$parameters);
+			}
+		}
+
+		return true;
+	}
+
+	public function __wakeup() {
+		throw new \LogicException( __CLASS__ . ' should never be unserialized' );
+	}
+}