Re: e-Mail Spam Protection

[b logica]

On Feb 6, 2008 5:25 AM, cronet <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
>
> In the template engine smarty, there exists an protection which
> encodes the address e.g. in hex chars. So the address isn't grabbable
> by spam bots via source...
>
> is there something like an e-Mail Spam protection or do I need to
> create a helper?
>

Hex translation probably won't help against bots anymore. It's a
trivial task to implement a bot that can translate hex. What I've been
doing is translating email addresses as they're written to output like
so:

[EMAIL PROTECTED] -> <span class="Obfuscated">foo AT bar DOT net</span>

Then, on the client side, I have some javascript that trawls through
each page for these spans and rewrites them as proper links. I doubt
there are any bots out there with a javascript engine, so this is
probably pretty safe. If javascript is disabled, the address is still
fairly understandable.

Here's the version that doesn't require any extra libraries (pretty
straightforward to convert this to work with, say, prototype, etc.):

/**
 * from Simon Willison
 *
 * http://simon.incutio.com/archive/2004/05/26/addLoadEvent
 **/
function addLoadEvent(func)
{
  var oldonload = window.onload;
  if (typeof window.onload != 'function')
  {
    window.onload = func;
  }
  else
  {
    window.onload = function()
    {
      oldonload();
      func();
    }
  }
}

addLoadEvent(function()
{
        var emails = document.getElementsByClassName('span', 'Obfuscated');
        
        if (!emails) return;
        
        var title = '';
        var search = [' AT ', ' DOT '];
        var replace = ['@', '.'];
        var replaced_text = '';
        
        for (var i = 0; i < emails.length; i++)
        {
                /* get the text node
                 */
                var text = emails[i].childNodes[0];
                
                if (text)
                {
                        /* search & replace text
                         */
                        replaced_text = text.nodeValue;
                        
                        for (var j = 0; j < search.length; j++)
                        {
                                var reg_exp = new RegExp(search[j], 'g');
                                replaced_text = replaced_text.replace(reg_exp, 
replace[j]);
                        }
                        
                        /* create anchor node
                         */
                        var link = document.createElement('a');
                        link.setAttribute('title', title);
                        link.setAttribute('href', 'mailto:' + replaced_text);
                        
                        /* create new text node and append to anchor
                         */
                        var text_node = document.createTextNode(replaced_text);
                        
                        link.appendChild(text_node);
                        
                        /* swap in anchor for text
                         */
                        emails[i].replaceChild(link, emails[i].childNodes[0]);
                }
        }
});

Whether you do the server-side stuff as a helper or not i can't say
because i haven't got there yet (still a Cake noob).

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