From 0c80c04dcd7f6946c40cf465478183030052248a Mon Sep 17 00:00:00 2001
From: letssync <letssync@noreply.codeberg.org>
Date: Fri, 31 Jul 2020 01:03:29 +0200
Subject: [PATCH] Add 'tool/userscript.cf_email_decoder.js'

---
 tool/userscript.cf_email_decoder.js | 52 +++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 tool/userscript.cf_email_decoder.js

diff --git a/tool/userscript.cf_email_decoder.js b/tool/userscript.cf_email_decoder.js
new file mode 100644
index 0000000..da90432
--- /dev/null
+++ b/tool/userscript.cf_email_decoder.js
@@ -0,0 +1,52 @@
+// ==UserScript==
+// @name        Decode Cloudflare-encoded email addresses
+// @original   https://codeberg.org/smege1001/cf_email_decoder
+// @match       *://*/*
+// @grant       none
+// @version     1.0
+// @author      smege1001
+// ==/UserScript==
+
+/**
+* @license CC0-1.0
+**/
+
+const emailprotectionURLHashRegex = /\/cdn-cgi\/l\/email-protection#([aA0-fF9]*)/;
+const emailprotectionURLNoHashRegex = /\/cdn-cgi\/l\/email-protection/; //hash is stored on data-cfemail
+
+function decodeEmail(hash) { //cloudflare email address decoder
+    var hashArray = []; //split the hash into bytes
+    for (var hAIndex = 0; hAIndex < hash.length; hAIndex += 2) {
+	hashArray.push(parseInt(hash.substring(hAIndex, hAIndex + 2), 16));
+    }
+    
+    var decoded = "";
+    var key = hashArray[0]; //get the decode key
+
+    for (var index = 1; index < hashArray.length; index++) {
+	decoded += String.fromCharCode(hashArray[index] ^ key);
+    }
+    return decoded;
+}
+
+var links = document.querySelectorAll("a"); //get all the links
+
+for (var linksIndex = 0; linksIndex < links.length; linksIndex++) {
+    var link = links[linksIndex];
+    if (emailprotectionURLHashRegex.test(link.href)) {
+	var hash = link.href.match(emailprotectionURLHashRegex)[1];
+	link.href = "mailto:" + decodeEmail(hash); //replace the stupid email protection with just a mailto link
+    } else if (emailprotectionURLNoHashRegex.test(link.href) && link.hasAttribute("data-cfemail")) {
+	var hash = link.getAttribute("data-cfemail");
+	var decodedEmail = decodeEmail(hash);
+	
+	link.href = "mailto:" + decodedEmail;
+	link.innerText = decodedEmail; //the inner text is just [email protected]
+
+	//remove the useless attributes
+	link.removeAttribute("data-cfemail");
+	link.classList.remove("__cf_email__");
+
+	if (link.getAttribute("class") == "") link.removeAttribute("class");
+    }
+}