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// Copyright 2011, Matthias Andreas Benkard.
"use strict";
jQuery(function($) {
var acceptable_cashhash = function (hash) {
return (hash[0] === '0' &&
hash[1] === '0' &&
hash[2] === '0' &&
hash[3] === '0');
};
var form_augmented_p = false;
$('.comment-form').submit(function() {
var form = $(this);
if (!form_augmented_p) {
$.ajax({
url: "/RPC/generate-transaction-key",
dataType: 'json',
success: function(tkey) {
var salt = 0;
var text = form.find('textarea').val().replace(/\s+/g, "");
var submit_button = form.find(':submit');
var status_message;
submit_button.after('<span class="hashcash-status-message">Calculating Hashcash...</span>');
status_message = form.find('.hashcash-status-message');
status_message.fadeOut(0);
status_message.fadeIn(200);
submit_button.attr("disabled", true);
var tryHashcash = function () {
var tryRightNow = 1000;
while (!acceptable_cashhash(Sha256.hash(text + ":" + tkey + ":" + salt))) {
salt++;
tryRightNow--;
if (tryRightNow === 0) {
setTimeout(tryHashcash, 0);
return;
}
}
form.prepend('<input type="hidden" name="transaction-key" value="' + tkey + '" />');
form.prepend('<input type="hidden" name="salt" value="' + salt + '" />');
form_augmented_p = true;
//submit_button.removeAttr("disabled");
$('.comment-form').submit();
form.submit();
};
setTimeout(tryHashcash, 0);
}
});
return false;
} else {
return true;
}
});
$('.spam-detection-info').html("This website uses a <a href=\"http://en.wikipedia.org/w/index.php?title=Hashcash&oldid=417692755\">Hashcash</a>-like proof-of-work system for spam detection.");
});
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