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4 years ago in HTML
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<html>
<head>
<title>Example HTML + Javascript Block Page</title>
<!-- We are going to use JQuery to make life a little easier, this can be done -->
<!-- without it, but then it's not so easy, or fun.  Use whatever library you  -->
<!-- are comfortable with.                                                     -->
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/purl/2.3.1/purl.min.js"></script>
<script language="Javascript">
// It is very important to unescape the information in the query parameters as they will
// be URL encoded.  unescape lends consistent results for the purposes of this exercise
/* Rot13 implementation to decode domain data */
/*
  rot13.js
  ROT13 + ROT5 Encoder/Decoder
  http://rot47.net
http://rot47.net/rot13.html
*/
function rot13(str) 
{
  return str.replace(/[a-zA-Z]/g, function(c){
    return String.fromCharCode((c <= 'Z' ? 90 : 122) >= (c = c.charCodeAt(0) + 13) ? c : c - 26);
  });
}
$(function() {
    // Get the domain query parameter, use example.com if we don't have one.
    var domain = $.url().param("url");
    if (domain) {
        domain = rot13(unescape(domain));
        // Since http:// is no longer passed, the above is the domain to print
    }
    else {
        domain = "www.example.com";
    }
            
    $("#domain").text(domain);
    
    // Set a default type to "block".  This allows us to just referance the block page
    // and see an example of what it would look like without needing extra parameters
    var type = $.url().param("type");
    if (!type)
        type = "block";
    
    // Show the appropriate messaging based on the redirect type
    switch (type) {
        // Blocked Categories/Domains
        case "ablock":
        case "block":
            $("#message").text("was blocked on this network.");
            if ($.url().param("cats")) {
                // categories are an escaped JSON array
                $("#message").append("<br />Blocked Categories: " + $.parseJSON(unescape($.url().param("cats"))).join(", "));
            }
            break;
            
        // Phishing Domains
        case "phish":
            $("#message").text("is believed to be involved in a phishing attack.");
            break;
        default:
            // You should probably log anything like this as it means people are either
            // playing with your block page or OpenDNS added an additional type and you
            // should be checking the documentation to see what it means.
            $("#message").text("is " + type);
            break;
    }
});
</script>
</head>
<body>
<!-- I'm not very stylistic, so this is a very plain block page.  Please feel  -->
<!-- free to do something a little nicer!                                      -->
<span id="domain"></span> <span id="message"></span>
</body>
</html>


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