From 9c256ad76f191149c0917719a59b019aa301dfa3 Mon Sep 17 00:00:00 2001
From: Hypolite Petovan <hypolite@mrpetovan.com>
Date: Sat, 31 Dec 2022 12:55:13 -0500
Subject: [PATCH] Remove obsolete OExchange module and reference

- Protocol looks unsupported for a decade now
---
 mod/oexchange.php                 | 126 ------------------------------
 src/Module/WellKnown/HostMeta.php |   7 --
 2 files changed, 133 deletions(-)
 delete mode 100644 mod/oexchange.php

diff --git a/mod/oexchange.php b/mod/oexchange.php
deleted file mode 100644
index 4fbf7ffeb..000000000
--- a/mod/oexchange.php
+++ /dev/null
@@ -1,126 +0,0 @@
-<?php
-/**
- * @copyright Copyright (C) 2010-2023, 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/>.
- *
- */
-
-use Friendica\App;
-use Friendica\Content\Text\BBCode;
-use Friendica\Content\Text\HTML;
-use Friendica\Core\System;
-use Friendica\DI;
-use Friendica\Module\Response;
-use Friendica\Module\Security\Login;
-use Friendica\Util\XML;
-
-function oexchange_init(App $a)
-{
-	if ((DI::args()->getArgc() <= 1) || (DI::args()->getArgv()[1] != 'xrd')) {
-		return;
-	}
-
-	$baseURL = DI::baseUrl()->get();
-
-	$xmlString = XML::fromArray([
-		'XRD' => [
-			'@attributes' => [
-				'xmlns'    => 'http://docs.oasis-open.org/ns/xri/xrd-1.0',
-			],
-			'Subject' => $baseURL,
-			'1:Property' => [
-				'@attributes' => [
-					'type'  => 'http://www.oexchange.org/spec/0.8/prop/vendor',
-				],
-				'Friendica'
-			],
-			'2:Property' => [
-				'@attributes' => [
-					'type'  => 'http://www.oexchange.org/spec/0.8/prop/title',
-				],
-				'Friendica Social Network'
-			],
-			'3:Property' => [
-				'@attributes' => [
-					'type'  => 'http://www.oexchange.org/spec/0.8/prop/name',
-				],
-				'Friendica'
-			],
-			'4:Property' => [
-				'@attributes' => [
-					'type'  => 'http://www.oexchange.org/spec/0.8/prop/prompt',
-				],
-				'Send to Friendica'
-			],
-			'1:link' => [
-				'@attributes' => [
-					'rel'  => 'icon',
-					'type' => 'image/png',
-					'href' => $baseURL . '/images/friendica-16.png'
-				]
-			],
-			'2:link' => [
-				'@attributes' => [
-					'rel'  => 'icon32',
-					'type' => 'image/png',
-					'href' => $baseURL . '/images/friendica-32.png'
-				]
-			],
-			'3:link' => [
-				'@attributes' => [
-					'rel'  => 'http://www.oexchange.org/spec/0.8/rel/offer',
-					'type' => 'text/html',
-					'href' => $baseURL . '/oexchange'
-				]
-			],
-		],
-	]);
-
-	System::httpExit($xmlString, Response::TYPE_XML, 'application/xrd+xml');
-}
-
-function oexchange_content(App $a)
-{
-	if (!DI::userSession()->getLocalUserId()) {
-		$o = Login::form();
-		return $o;
-	}
-
-	if ((DI::args()->getArgc() > 1) && DI::args()->getArgv()[1] === 'done') {
-		return;
-	}
-
-	$url         = !empty($_REQUEST['url'])         ? trim($_REQUEST['url'])         : '';
-	$title       = !empty($_REQUEST['title'])       ? trim($_REQUEST['title'])       : '';
-	$description = !empty($_REQUEST['description']) ? trim($_REQUEST['description']) : '';
-	$tags        = !empty($_REQUEST['tags'])        ? trim($_REQUEST['tags'])        : '';
-
-	$s = BBCode::embedURL($url, true, $title, $description, $tags);
-
-	if (!strlen($s)) {
-		return;
-	}
-
-	$post = [];
-
-	$post['return'] = '/oexchange/done';
-	$post['body'] = HTML::toBBCode($s);
-
-	$_REQUEST = $post;
-	require_once 'mod/item.php';
-	item_post($a);
-}
diff --git a/src/Module/WellKnown/HostMeta.php b/src/Module/WellKnown/HostMeta.php
index fa6619920..512ff8dd0 100644
--- a/src/Module/WellKnown/HostMeta.php
+++ b/src/Module/WellKnown/HostMeta.php
@@ -80,13 +80,6 @@ class HostMeta extends BaseModule
 						'href' => $domain . '/amcd'
 					]
 				],
-				'5:link' => [
-					'@attributes' => [
-						'rel'  => 'http://oexchange.org/spec/0.8/rel/resident-target',
-						'type' => 'application/xrd+xml',
-						'href' => $domain . '/oexchange/xrd'
-					]
-				],
 				'Property' => [
 					'@attributes' => [
 						'type'      => 'http://salmon-protocol.org/ns/magic-key',