From bf95e292f148f5c42bf834a64e42bf04154403bf Mon Sep 17 00:00:00 2001 From: Matthias Andreas Benkard Date: Tue, 15 Mar 2011 02:01:20 +0100 Subject: Optionally use Hashcash for comment verification. --- static-files/js/comment-submission.js | 41 ++++++++ static-files/js/jquery.js | 16 ++++ static-files/js/sha256.js | 174 ++++++++++++++++++++++++++++++++++ 3 files changed, 231 insertions(+) create mode 100644 static-files/js/comment-submission.js create mode 100644 static-files/js/jquery.js create mode 100644 static-files/js/sha256.js (limited to 'static-files/js') diff --git a/static-files/js/comment-submission.js b/static-files/js/comment-submission.js new file mode 100644 index 0000000..13c3849 --- /dev/null +++ b/static-files/js/comment-submission.js @@ -0,0 +1,41 @@ +// 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); + $.ajax({ + url: "/RPC/generate-transaction-key", + dataType: 'json', + success: function(tkey) { + if (!form_augmented_p) { + form.find(':submit').attr("disabled", true); + var salt = 0; + var text = form.find('textarea'); + while (!acceptable_cashhash(Sha256.hash(text + ":" + tkey + ":" + salt))) { + salt++; + } + form.prepend(''); + form.prepend(''); + form_augmented_p = true; + form.submit(); + return false; + } else { + return true; + } + } + }); + return false; + }); + $('.spam-detection-method').text("Hashcash"); + $('.irrelevant-for-hashcash').text(''); +}); diff --git a/static-files/js/jquery.js b/static-files/js/jquery.js new file mode 100644 index 0000000..6437874 --- /dev/null +++ b/static-files/js/jquery.js @@ -0,0 +1,16 @@ +/*! + * jQuery JavaScript Library v1.5.1 + * http://jquery.com/ + * + * Copyright 2011, John Resig + * Dual licensed under the MIT or GPL Version 2 licenses. + * http://jquery.org/license + * + * Includes Sizzle.js + * http://sizzlejs.com/ + * Copyright 2011, The Dojo Foundation + * Released under the MIT, BSD, and GPL Licenses. + * + * Date: Wed Feb 23 13:55:29 2011 -0500 + */ +(function(a,b){function cg(a){return d.isWindow(a)?a:a.nodeType===9?a.defaultView||a.parentWindow:!1}function cd(a){if(!bZ[a]){var b=d("<"+a+">").appendTo("body"),c=b.css("display");b.remove();if(c==="none"||c==="")c="block";bZ[a]=c}return bZ[a]}function cc(a,b){var c={};d.each(cb.concat.apply([],cb.slice(0,b)),function(){c[this]=a});return c}function bY(){try{return new a.ActiveXObject("Microsoft.XMLHTTP")}catch(b){}}function bX(){try{return new a.XMLHttpRequest}catch(b){}}function bW(){d(a).unload(function(){for(var a in bU)bU[a](0,1)})}function bQ(a,c){a.dataFilter&&(c=a.dataFilter(c,a.dataType));var e=a.dataTypes,f={},g,h,i=e.length,j,k=e[0],l,m,n,o,p;for(g=1;g=0===c})}function N(a){return!a||!a.parentNode||a.parentNode.nodeType===11}function F(a,b){return(a&&a!=="*"?a+".":"")+b.replace(r,"`").replace(s,"&")}function E(a){var b,c,e,f,g,h,i,j,k,l,m,n,o,q=[],r=[],s=d._data(this,"events");if(a.liveFired!==this&&s&&s.live&&!a.target.disabled&&(!a.button||a.type!=="click")){a.namespace&&(n=new RegExp("(^|\\.)"+a.namespace.split(".").join("\\.(?:.*\\.)?")+"(\\.|$)")),a.liveFired=this;var t=s.live.slice(0);for(i=0;ic)break;a.currentTarget=f.elem,a.data=f.handleObj.data,a.handleObj=f.handleObj,o=f.handleObj.origHandler.apply(f.elem,arguments);if(o===!1||a.isPropagationStopped()){c=f.level,o===!1&&(b=!1);if(a.isImmediatePropagationStopped())break}}return b}}function C(a,c,e){var f=d.extend({},e[0]);f.type=a,f.originalEvent={},f.liveFired=b,d.event.handle.call(c,f),f.isDefaultPrevented()&&e[0].preventDefault()}function w(){return!0}function v(){return!1}function g(a){for(var b in a)if(b!=="toJSON")return!1;return!0}function f(a,c,f){if(f===b&&a.nodeType===1){f=a.getAttribute("data-"+c);if(typeof f==="string"){try{f=f==="true"?!0:f==="false"?!1:f==="null"?null:d.isNaN(f)?e.test(f)?d.parseJSON(f):f:parseFloat(f)}catch(g){}d.data(a,c,f)}else f=b}return f}var c=a.document,d=function(){function I(){if(!d.isReady){try{c.documentElement.doScroll("left")}catch(a){setTimeout(I,1);return}d.ready()}}var d=function(a,b){return new d.fn.init(a,b,g)},e=a.jQuery,f=a.$,g,h=/^(?:[^<]*(<[\w\W]+>)[^>]*$|#([\w\-]+)$)/,i=/\S/,j=/^\s+/,k=/\s+$/,l=/\d/,m=/^<(\w+)\s*\/?>(?:<\/\1>)?$/,n=/^[\],:{}\s]*$/,o=/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,p=/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,q=/(?:^|:|,)(?:\s*\[)+/g,r=/(webkit)[ \/]([\w.]+)/,s=/(opera)(?:.*version)?[ \/]([\w.]+)/,t=/(msie) ([\w.]+)/,u=/(mozilla)(?:.*? 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\ No newline at end of file diff --git a/static-files/js/sha256.js b/static-files/js/sha256.js new file mode 100644 index 0000000..a98498d --- /dev/null +++ b/static-files/js/sha256.js @@ -0,0 +1,174 @@ +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ +/* SHA-256 implementation in JavaScript | (c) Chris Veness 2002-2010 | www.movable-type.co.uk */ +/* - see http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html */ +/* http://csrc.nist.gov/groups/ST/toolkit/examples.html */ +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ + +var Sha256 = {}; // Sha256 namespace + +/** + * Generates SHA-256 hash of string + * + * @param {String} msg String to be hashed + * @param {Boolean} [utf8encode=true] Encode msg as UTF-8 before generating hash + * @returns {String} Hash of msg as hex character string + */ +Sha256.hash = function(msg, utf8encode) { + utf8encode = (typeof utf8encode == 'undefined') ? true : utf8encode; + + // convert string to UTF-8, as SHA only deals with byte-streams + if (utf8encode) msg = Utf8.encode(msg); + + // constants [§4.2.2] + var K = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, + 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, + 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, + 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, + 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, + 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, + 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, + 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2]; + // initial hash value [§5.3.1] + var H = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]; + + // PREPROCESSING + + msg += String.fromCharCode(0x80); // add trailing '1' bit (+ 0's padding) to string [§5.1.1] + + // convert string msg into 512-bit/16-integer blocks arrays of ints [§5.2.1] + var l = msg.length/4 + 2; // length (in 32-bit integers) of msg + ‘1’ + appended length + var N = Math.ceil(l/16); // number of 16-integer-blocks required to hold 'l' ints + var M = new Array(N); + + for (var i=0; i>> 32, but since JS converts + // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators + M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14]) + M[N-1][15] = ((msg.length-1)*8) & 0xffffffff; + + + // HASH COMPUTATION [§6.1.2] + + var W = new Array(64); var a, b, c, d, e, f, g, h; + for (var i=0; i>> n) | (x << (32-n)); } +Sha256.Sigma0 = function(x) { return Sha256.ROTR(2, x) ^ Sha256.ROTR(13, x) ^ Sha256.ROTR(22, x); } +Sha256.Sigma1 = function(x) { return Sha256.ROTR(6, x) ^ Sha256.ROTR(11, x) ^ Sha256.ROTR(25, x); } +Sha256.sigma0 = function(x) { return Sha256.ROTR(7, x) ^ Sha256.ROTR(18, x) ^ (x>>>3); } +Sha256.sigma1 = function(x) { return Sha256.ROTR(17, x) ^ Sha256.ROTR(19, x) ^ (x>>>10); } +Sha256.Ch = function(x, y, z) { return (x & y) ^ (~x & z); } +Sha256.Maj = function(x, y, z) { return (x & y) ^ (x & z) ^ (y & z); } + +// +// hexadecimal representation of a number +// (note toString(16) is implementation-dependant, and +// in IE returns signed numbers when used on full words) +// +Sha256.toHexStr = function(n) { + var s="", v; + for (var i=7; i>=0; i--) { v = (n>>>(i*4)) & 0xf; s += v.toString(16); } + return s; +} + + +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ +/* Utf8 class: encode / decode between multi-byte Unicode characters and UTF-8 multiple */ +/* single-byte character encoding (c) Chris Veness 2002-2010 */ +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ + +var Utf8 = {}; // Utf8 namespace + +/** + * Encode multi-byte Unicode string into utf-8 multiple single-byte characters + * (BMP / basic multilingual plane only) + * + * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars + * + * @param {String} strUni Unicode string to be encoded as UTF-8 + * @returns {String} encoded string + */ +Utf8.encode = function(strUni) { + // use regular expressions & String.replace callback function for better efficiency + // than procedural approaches + var strUtf = strUni.replace( + /[\u0080-\u07ff]/g, // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz + function(c) { + var cc = c.charCodeAt(0); + return String.fromCharCode(0xc0 | cc>>6, 0x80 | cc&0x3f); } + ); + strUtf = strUtf.replace( + /[\u0800-\uffff]/g, // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz + function(c) { + var cc = c.charCodeAt(0); + return String.fromCharCode(0xe0 | cc>>12, 0x80 | cc>>6&0x3F, 0x80 | cc&0x3f); } + ); + return strUtf; +} + +/** + * Decode utf-8 encoded string back into multi-byte Unicode characters + * + * @param {String} strUtf UTF-8 string to be decoded back to Unicode + * @returns {String} decoded string + */ +Utf8.decode = function(strUtf) { + // note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char! + var strUni = strUtf.replace( + /[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars + function(c) { // (note parentheses for precence) + var cc = ((c.charCodeAt(0)&0x0f)<<12) | ((c.charCodeAt(1)&0x3f)<<6) | ( c.charCodeAt(2)&0x3f); + return String.fromCharCode(cc); } + ); + strUni = strUni.replace( + /[\u00c0-\u00df][\u0080-\u00bf]/g, // 2-byte chars + function(c) { // (note parentheses for precence) + var cc = (c.charCodeAt(0)&0x1f)<<6 | c.charCodeAt(1)&0x3f; + return String.fromCharCode(cc); } + ); + return strUni; +} + +/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ -- cgit v1.2.3