Initial Commit

LICENSE

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+MIT License
+
+Copyright (c) 2018 Steven Sullivan
+
+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.

composer.json

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+{
+    "name": "ss88/easy_unsubscribe",
+    "type": "roundcube-plugin",
+    "description": "Displays a small icon after the subject line when viewing an email, so you can very quickly unsubscribe.",
+    "license": "GPL-3.0+",
+    "keywords": ["unsubscribe","subscription", "newsletter", "mailer"],
+    "homepage": "https://github.com/SS88UK/roundcube-easy-unsubscribe",
+    "repositories": [
+        {
+            "type": "composer",
+            "url": "https://plugins.roundcube.net"
+        }
+    ],
+    "require": {
+        "roundcube/plugin-installer": ">=0.1.6"
+    }
+}

easy_unsubscribe.css

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+.easy_unsubscribe_link img { height: 13px; margin-left: 10px; vertical-align: middle; opacity: 0.5; transition:all 0.3s ease; }
+.easy_unsubscribe_link:hover img { opacity:1; }

easy_unsubscribe.php

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+<?php
+
+class easy_unsubscribe extends rcube_plugin
+{	
+	function init()
+	{
+		$rcmail = rcmail::get_instance();
+		$layout = $rcmail->config->get('layout');
+
+		$this->add_hook('message_headers_output', array($this, 'message_headers'));
+		$this->add_hook('storage_init', array($this, 'storage_init'));
+		
+		$this->include_stylesheet('easy_unsubscribe.css');
+	}
+	
+    public function storage_init($p)
+    {
+        $p['fetch_headers'] = trim($p['fetch_headers'] . ' ' . strtoupper('List-Unsubscribe'));
+        return $p;
+    }
+	
+    public function message_headers($p)
+    {		
+		$ListUnsubscribe = $p['headers']->others['list-unsubscribe'];
+		preg_match('/<(.*?)>/', $ListUnsubscribe, $rVal);
+		if($rVal[1]!='')
+			$O = '<a class="easy_unsubscribe_link" title="Unsubscribe" href="'.$rVal[1].'" target="_blank" onclick="return confirm(\'Are you sure you want to unsubscribe?\');"><img src="plugins/easy_unsubscribe/icon.png" alt="Unsubscribe" /></a>';
+		else
+		{
+			preg_match('#\bhttps?://[^,\s()<>]+(?:\([\w\d]+\)|([^,[:punct:]\s]|/))#', $ListUnsubscribe, $rVal);
+			if($rVal[0]!='')
+				$O = '<a class="easy_unsubscribe_link" title="Unsubscribe" href="'.$rVal[0].'" target="_blank" onclick="return confirm(\'Are you sure you want to unsubscribe?\');"><img src="plugins/easy_unsubscribe/icon.png" alt="Unsubscribe" /></a>';
+		}
+
+        $p['output']['subject']['value'] = $p['output']['subject']['value'] . $O;
+        $p['output']['subject']['html'] = true;
+
+        return $p;
+    }
+}