New model class "host"

database.sql

@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2020.09-dev (Red Hot Poker)
--- DB_UPDATE_VERSION 1366
+-- DB_UPDATE_VERSION 1367
 -- ------------------------------------------
 
 
@@ -585,6 +585,16 @@ CREATE TABLE IF NOT EXISTS `hook` (
 	 UNIQUE INDEX `hook_file_function` (`hook`,`file`,`function`)
 ) DEFAULT COLLATE utf8mb4_general_ci COMMENT='addon hook registry';
 
+--
+-- TABLE host
+--
+CREATE TABLE IF NOT EXISTS `host` (
+	`id` tinyint unsigned NOT NULL auto_increment COMMENT 'sequential ID',
+	`name` varchar(128) NOT NULL DEFAULT '' COMMENT 'The hostname',
+	 PRIMARY KEY(`id`),
+	 UNIQUE INDEX `name` (`name`)
+) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Hostname';
+
 --
 -- TABLE inbox-status
 --

src/Model/Host.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @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\Model;
+
+use Friendica\Core\Logger;
+use Friendica\Database\DBA;
+
+class Host
+{
+	/**
+	 * Get the id for a given hostname
+	 * When empty, the current hostname is used
+	 *
+	 * @param string $hostname
+	 *
+	 * @return integer host name id
+	 * @throws \Exception
+	 */
+	public static function getId(string $hostname = '')
+	{
+		if (empty($hostname)) {
+			$hostname = php_uname('n');
+		}
+
+		$hostname = strtolower($hostname);
+
+		$host = DBA::selectFirst('host', ['id'], ['name' => $hostname]);
+		if (!empty($host['id'])) {
+			return $host['id'];
+		}
+
+		DBA::replace('host', ['name' => $hostname]);
+
+		$host = DBA::selectFirst('host', ['id'], ['name' => $hostname]);
+		if (empty($host['id'])) {
+			Logger::warning('Host name could not be inserted', ['name' => $hostname]);
+			return 0;
+		}
+
+		return $host['id'];
+	}
+
+	/**
+	 * Get the hostname for a given id
+	 *
+	 * @param int $id
+	 *
+	 * @return string host name
+	 * @throws \Exception
+	 */
+	public static function getName(int $id)
+	{
+		$host = DBA::selectFirst('host', ['name'], ['id' => $id]);
+		if (!empty($host['name'])) {
+			return $host['name'];
+		}
+
+		return '';
+	}
+}

static/dbstructure.config.php

@@ -54,7 +54,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1366);
+	define('DB_UPDATE_VERSION', 1367);
 }
 
 return [
@@ -653,6 +653,17 @@ return [
 			"hook_file_function" => ["UNIQUE", "hook", "file", "function"],
 		]
 	],
+	"host" => [
+		"comment" => "Hostname",
+		"fields" => [
+			"id" => ["type" => "tinyint unsigned", "not null" => "1", "extra" => "auto_increment", "primary" => "1", "comment" => "sequential ID"],
+			"name" => ["type" => "varchar(128)", "not null" => "1", "default" => "", "comment" => "The hostname"],
+		],
+		"indexes" => [
+			"PRIMARY" => ["id"],
+			"name" => ["UNIQUE", "name"],
+		]
+	],
 	"inbox-status" => [
 		"comment" => "Status of ActivityPub inboxes",
 		"fields" => [