Encoding mailto: fields with Lektor, email cloaking with Lektor

Question

I want to "encode" mailto: fields on my web-page using Javascript to avoid SPAM. (This is also known as Email cloaking.)

I saw some implementation of this Idea here.

Now I'd like to add this mail address obfuscation functionality to the lektor admin interface.

Where (lektor-framework-wise) and how (plugin, addon, template, flowblock, type) would be the simplest way to achieve this?

I imagine an available (flow-)block in the admin interface with fields where I could enter:

• the mail address as a string (which will be encoded) and
• an additional replacement string (which would be rendered on the webpage). The string shall be decoded "on click" only - on mouseover I see (javascript:linkTo_UnCryptMailto('nbjmup;kvfshfoAkvnl/ef'));

Building the page with lektor should yield no plaintext e-mail addresses. And preferably enable the user to add it to a paragraph "inline".

I am also open to recommendations regarding better ways to avoid spam while enabling someone to contact you via e-mail.