[feat] Initial check-in.

.gitignore

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+#*
+*~
+

README.md

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+# Tumblr Evil Detector
+
+## Description
+
+This is a simple TamperMonkey script that does one thing: warn you if
+you're about to reblog a post with a script in it.  Malicious users will
+often hide javascript tags in the caption of a photograph which detects
+when you're actually looking at the page (through mouse or keyboard
+actions) and redirects you a site full of malware, spam, or porn.  This
+script is intended to help prevent that, and make your follower's
+reading experience more pleasant.
+
+## Installation
+
+You will need Tampermonkey installed in your browser, then install the
+Javascript file found in this directory into Tampermonkey.
+
+## Behavior
+
+The URL filter currently only identifies pages on Tumblr that are POST
+pages.  If the user has a custom DNS, sadly we can't detect them, but
+few if any spammers go to those lengths to snare people.  It will put a
+message in the UPPER LEFT corner of the page with the words "SCRIPT
+DETECTED" if a malicious javascript file is detected in the post
+message.
+
+That's all it does.  It's very short.  But it's also very effective.
+
+## LICENSE:
+
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+## AUTHOR:
+
+Me, Elf M. Sternberg <elf.sternberg@gmail.com>

tumblr-evil-detector.js

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+// ==UserScript==
+// @name         TumblrEvilDetector
+// @namespace    http://elfsternberg.com
+// @version      0.1
+// @description  Detect if a Tumblr post has an embedded script in it
+// @author       Elf M. Sternberg <elf.sternberg@gmail.com>
+// @match        http://*.tumblr.com/post/*
+// @grant        none
+// ==/UserScript==
+/* jshint -W097 */
+'use strict';
+
+function tumblr_reblog_warning() {
+    var post = document.querySelectorAll('.post-wrapper script');
+    if (post.length > 0) {
+        document.body.innerHTML += ('<div style="background-color: rgba(0,0,0,0.6);  float: right; position: absolute; top: 20px; width: 400px; color:limegreen; border: 4px solid limegreen">' +
+                                    'SCRIPT DETECTED</div>');
+    }
+}
+
+window.setTimeout(tumblr_reblog_warning, 500);