initial commit of the addon and README files

nitter.php

@@ -0,0 +1,43 @@
+<?php
+/*
+ * Name: nitter
+ * Description: Replaces links to twitter.com to a nitter server in all displays of postings on a node.
+ * Version: 1.0
+ * Author: Tobias Diekershoff <tobias@social.diekershoff.de>
+ *
+ * Copyright (c) 2020 Tobias Diekershoff
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
+ * associated documentation files (the "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all copies or substantial
+ * portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+ * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+use Friendica\Core\Addon;
+use Friendica\DI;
+
+function nitter_install() {
+    Addon::registerHook ('prepare_body', 'addon/nitter/nitter.php', 'nitter_render');
+}
+
+/*
+ *  replace "twitter.com" with "nitter.net"
+ */
+function nitter_render(&$a, &$o) {
+    // this needs to be a system setting
+    $nitter = 'https://nitter.net';
+    if (strstr($o[html],'https://twitter.com')) {
+        $o['html'] = str_replace('https://twitter.com', $nitter, $o[html]);
+        $o['html'] .= '<hr><p>'.DI::l10n()->t('Links to Twitter in this posting were replaced by links to the Nitter instance at %s', $nitter).'</p>';
+    }
+}