Add configuration for uploading FCM v1 service account private key file

common/framework/drivers/push/fcmv1.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Push;
+
+use Rhymix\Framework\HTTP;
+use Rhymix\Framework\Push;
+use Rhymix\Framework\Drivers\PushInterface;
+
+/**
+ * The FCM HTTP v1 API Push driver.
+ */
+class FCMv1 extends Base implements PushInterface
+{
+	/**
+	 * Config keys used by this driver are stored here.
+	 */
+	protected static $_required_config = array('service_account');
+	protected static $_optional_config = array();
+
+	/**
+	 * Get the human-readable name of this Push driver.
+	 *
+	 * @return string
+	 */
+	public static function getName(): string
+	{
+		return 'FCM HTTP v1 API';
+	}
+
+	/**
+	 * Check if the current Push driver is supported on this server.
+	 *
+	 * This method returns true on success and false on failure.
+	 *
+	 * @return bool
+	 */
+	public static function isSupported(): bool
+	{
+		return true;
+	}
+
+	/**
+	 * Send a message.
+	 *
+	 * This method returns true on success and false on failure.
+	 *
+	 * @param object $message
+	 * @param array $tokens
+	 * @return \stdClass
+	 */
+	public function send(Push $message, array $tokens): \stdClass
+	{
+		return new \stdClass;
+	}
+}