Greasy Fork is available in English.
Warns on clicking links and arriving into sites which uses PunyCode.
// ==UserScript==
// @name PunyCode Protection
// @namespace PunyCode Protection
// @version 1.0.4
// @description Warns on clicking links and arriving into sites which uses PunyCode.
// @author jcunews
// @match *://*/*
// @grant none
// @run-at document-start
// ==/UserScript==
//URL to redirect when user rejected the prompt upon arriving to a possibly fake site.
var redirectURL = "about:blank";
//---------------------------punycode.js start
//source: https://github.com/bestiejs/punycode.js/blob/master/punycode.js
//modified to be compatible with ES5.1 and client-side scripting, and to remove comments.
var punycode = (function() {
var maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1
var base = 36;
var tMin = 1;
var tMax = 26;
var skew = 38;
var damp = 700;
var initialBias = 72;
var initialN = 128; // 0x80
var delimiter = '-'; // '\x2D'
var regexPunycode = /^xn--/;
var regexNonASCII = /[^\0-\x7E]/; // non-ASCII chars
var regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g; // RFC 3490 separators
var errors = {
'overflow': 'Overflow: input needs wider integers to process',
'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
'invalid-input': 'Invalid input'
};
var baseMinusTMin = base - tMin;
var floor = Math.floor;
var stringFromCharCode = String.fromCharCode;
function error(type) {
throw new RangeError(errors[type]);
}
function map(array, fn) {
var result = [];
var length = array.length;
while (length--) {
result[length] = fn(array[length]);
}
return result;
}
function mapDomain(string, fn) {
var parts = string.split('@');
var result = '';
if (parts.length > 1) {
result = parts[0] + '@';
string = parts[1];
}
string = string.replace(regexSeparators, '\x2E');
var labels = string.split('.');
var encoded = map(labels, fn).join('.');
return result + encoded;
}
function ucs2decode(string) {
var output = [];
var counter = 0;
var length = string.length;
while (counter < length) {
var value = string.charCodeAt(counter++);
if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
var extra = string.charCodeAt(counter++);
if ((extra & 0xFC00) == 0xDC00) { // Low surrogate.
output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
} else {
output.push(value);
counter--;
}
} else {
output.push(value);
}
}
return output;
}
//var ucs2encode = array => String.fromCodePoint(...array);
var ucs2encode = function(array) {
return String.fromCodePoint.apply(String, array);
};
var basicToDigit = function(codePoint) {
if (codePoint - 0x30 < 0x0A) {
return codePoint - 0x16;
}
if (codePoint - 0x41 < 0x1A) {
return codePoint - 0x41;
}
if (codePoint - 0x61 < 0x1A) {
return codePoint - 0x61;
}
return base;
};
var digitToBasic = function(digit, flag) {
return digit + 22 + 75 * (digit < 26) - ((flag !== 0) << 5);
};
var adapt = function(delta, numPoints, firstTime) {
var k = 0;
delta = firstTime ? floor(delta / damp) : delta >> 1;
delta += floor(delta / numPoints);
for (; delta > baseMinusTMin * tMax >> 1; k += base) {
delta = floor(delta / baseMinusTMin);
}
return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
};
var decode = function(input) {
var output = [];
var inputLength = input.length;
var i = 0;
var n = initialN;
var bias = initialBias;
var basic = input.lastIndexOf(delimiter);
if (basic < 0) {
basic = 0;
}
for (var j = 0; j < basic; ++j) {
if (input.charCodeAt(j) >= 0x80) {
error('not-basic');
}
output.push(input.charCodeAt(j));
}
for (var index = basic > 0 ? basic + 1 : 0; index < inputLength;) {
var oldi = i;
for (var w = 1, k = base; ; k += base) {
if (index >= inputLength) {
error('invalid-input');
}
var digit = basicToDigit(input.charCodeAt(index++));
if (digit >= base || digit > floor((maxInt - i) / w)) {
error('overflow');
}
i += digit * w;
var t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
if (digit < t) {
break;
}
var baseMinusT = base - t;
if (w > floor(maxInt / baseMinusT)) {
error('overflow');
}
w *= baseMinusT;
}
var out = output.length + 1;
bias = adapt(i - oldi, out, oldi === 0);
if (floor(i / out) > maxInt - n) {
error('overflow');
}
n += floor(i / out);
i %= out;
output.splice(i++, 0, n);
}
// return String.fromCodePoint(...output);
return String.fromCodePoint.apply(String, output);
};
var encode = function(input) {
var output = [];
input = ucs2decode(input);
var inputLength = input.length;
var n = initialN;
var delta = 0;
var bias = initialBias;
input.forEach(function(currentValue) {
if (currentValue < 0x80) {
output.push(stringFromCharCode(currentValue));
}
});
var basicLength = output.length;
var handledCPCount = basicLength;
if (basicLength) {
output.push(delimiter);
}
while (handledCPCount < inputLength) {
var m = maxInt;
input.forEach(function(currentValue) {
if (currentValue >= n && currentValue < m) {
m = currentValue;
}
});
var handledCPCountPlusOne = handledCPCount + 1;
if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
error('overflow');
}
delta += (m - n) * handledCPCountPlusOne;
n = m;
input.forEach(function(currentValue) {
if (currentValue < n && ++delta > maxInt) {
error('overflow');
}
if (currentValue == n) {
var q = delta;
for (var k = base; ; k += base) {
var t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
if (q < t) {
break;
}
var qMinusT = q - t;
var baseMinusT = base - t;
output.push(
stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
);
q = floor(qMinusT / baseMinusT);
}
output.push(stringFromCharCode(digitToBasic(q, 0)));
bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
delta = 0;
++handledCPCount;
}
});
++delta;
++n;
}
return output.join('');
};
var toUnicode = function(input) {
return mapDomain(input, function(string) {
return regexPunycode.test(string) ? decode(string.slice(4).toLowerCase()) : string;
});
};
var toASCII = function(input) {
return mapDomain(input, function(string) {
return regexNonASCII.test(string) ? 'xn--' + encode(string) : string;
});
};
return {
'version': '2.1.0',
'ucs2': {
'decode': ucs2decode,
'encode': ucs2encode
},
'decode': decode,
'encode': encode,
'toASCII': toASCII,
'toUnicode': toUnicode
};
})();
//---------------------------punycode.js end
var hostname;
window.pc=punycode;
function latinLike(s) {
return punycode.ucs2.decode(s).some(function(code){
return (
//C1 Controls and Latin-1 Supplement; up to Cyrillic Supplement
(code >= 0x0080) && (code <= 0x052f) ||
//Cherokee
(code >= 0x13a0) && (code <= 0x13ff) ||
//Cyrillic Extended-C
(code >= 0x1c80) && (code <= 0x1c8f) ||
//Latin-2 supplement, Greek Extended
(code >= 0x1d00) && (code <= 0x1eff) ||
//Superscripts and Subscripts
(code >= 0x2070) && (code <= 0x209f) ||
//Letterlike Symbols
(code >= 0x2100) && (code <= 0x214f) ||
//Latin Extended-C, Coptic, Tifinagh
(code >= 0x2c60) && (code <= 0x2d7f) ||
//Cyrillic Extended-A
(code >= 0x2de0) && (code <= 0x2dff) ||
//Lisu
(code >= 0xa4d0) && (code <= 0xa4ff) ||
//Cyrillic Extended-B
(code >= 0xa640) && (code <= 0xa69f) ||
//Latin Extended-D
(code >= 0xa720) && (code <= 0xa7ff) ||
//Latin Extended-E, Cherokee Supplement
(code >= 0xab30) && (code <= 0xabbf) ||
//Halfwidth and Fullwidth Forms (letters only)
(code >= 0xff00) && (code <= 0xff5a)
);
})
}
function checkHostName(ahostname, hn, suspicious) {
suspicious = latinLike(ahostname);
if (suspicious) {
hn = punycode.toUnicode(ahostname);
if (hn === ahostname) {
hn = punycode.toASCII(ahostname);
suspicious = hn !== ahostname;
} else {
hn = ahostname;
suspicious = true;
}
hostname = hn;
} else if (suspicious = ((hn = punycode.toUnicode(ahostname)) !== ahostname) && latinLike(hn)) hostname = ahostname;
return suspicious;
}
//warn upon arriving to a possibly fake site
if (checkHostName(location.hostname) &&
!confirm("Warning! This website real domain name is:\n\n" + hostname + "\n\nDo you want to proceed?")) {
location.href = redirectURL;
}
//warn on clicking a link pointing to a possibly fake site
addEventListener("click", function(ev) {
if (!ev.button && ev.target && (ev.target.tagName === "A") &&
ev.target.hostname && (ev.target.hostname !== location.hostname)) {
if (checkHostName(ev.target.hostname) &&
!confirm("Warning! About to go to a web page whose real domain name is:\n\n" + hostname + "\n\nDo you want to proceed?")) {
ev.preventDefault();
if (ev.stopPropagation) ev.stopPropagation();
if (ev.stopImmediatePropagation) ev.stopImmediatePropagation();
return false;
}
}
return true;
}, true);
//hook window.open()
var _open = window.open;
window._open = window.open;
window.open = function(url) {
if (checkHostName(url) &&
!confirm("Warning! A script is about to open a web page whose real domain name is:\n\n" + hostname + "\n\nDo you want to proceed?")) {
return null;
}
return _open.apply(window, arguments);
};