Функции, используемые для деобфускации электронных писем, доступны в источнике страницы:
//This is a first layer of deobfuscation.
//Basically a reversed ROT13 algorithm.
function changeLetters(string) {
//Helper variables.
var currentLetter,
currentPos,
currentString = "",
//Behold! The one and only counter.
i = 0,
//We"re going to loop through the obfuscated strings characters, so this will come in handy.
stringLength = string.length - 1,
//Characters that will be used when deobfuscating email address.
//Same as string in PHP obfuscate function (obfuscateEmail).
characters = "123456789qwertzuiopasdfghjklyxcvbnmMNBVCXYLKJHGFDSAPOIUZTREWQ",
charactersLength = characters.length;
//Counter variable has been declared before.
for( ; i<stringLength; i++ ) {
//This letter will be deobfuscated.
currentLetter = string.charAt(i);
//Position of the letter in our characters string.
currentPos = characters.indexOf(currentLetter);
//If character is present in our string, replace it with a character
//30 places before (opposite from obfuscating).
//If not, leave it as it is (because character wasn"t obfuscated).
if( currentPos > -1 ) {
currentPos -= (charactersLength-1) / 2;
currentPos = currentPos < 0 ? charactersLength + currentPos : currentPos;
} else {
currentString += currentLetter;
}
//Finally, append a character to our temp string that will be returned.
currentString += characters.charAt(currentPos);
}
return currentString;
}
//Function that will handle email deobfuscation.
//@param element is a reference to html element that will be deobfuscated.
//Deobfuscation is done on text and on href attribute of the element.
//Nevertheless, function will work well with any element you pass in,
//even if href attribute won"t be present.
function deObfuscateEmail( element ) {
//Get the text of the element.
var text = element.innerHTML,
//Get href attribute. If there is no href attribute, set href value to be an empty string.
//Regular expression is an IE Fix.
//Namely, IE appends obfuscated email to the url (www.domain.com/com.liameym@em).
//Therefore, the first part of the link needs to be removed (we grab just everything after the last forward slash "/").
href = element.getAttribute("href").replace(/http:\/\/(.+)\//gi, "") || "",
//Control variable. if the two @ symbols are present, we will perform deobfuscation,
//if not, the string is not obfuscated and doesn"t have to be deobfuscated.
textReplace = text.search(/@.+@/),
hrefReplace = href.search(/@.+@/),
//This function handles the second layer of deobfuscation.
//It is called later in the code.
//Letters of the email are reversed (again) and css direction returned back to ltr.
//This is called on mouseover event.
reverseEmails = function(){
//Only if htef is obfuscated.
if( hrefReplace > -1 ) {
//That"s the reversing part right here.
element.setAttribute("href", href.split("").reverse().join("") );
}
//Only if text is obfuscated.
if( textReplace > -1 ) {
//Reverse the text of the element and
//return the direction to normal (left to right).
element.innerHTML = text.split("").reverse().join("");
element.style.direction = "ltr";
element.style.unicodeBidi = "normal";
}
//Letters are replaced and the event isn"t needed anymore.
if( element.removeEventListener ) {
element.removeEventListener("mouseover", reverseEmails, false);
} else {
// IE8-
element.detachEvent("onmouseover", reverseEmails);
}
};
//End variables and functions definitions.
//href has to be processed first, because of the strange
//IE bug that will mix the href and innerHTML values.
if( hrefReplace > -1 ) {
href = changeLetters(href);
element.setAttribute("href", href);
}
//Change the direction of the text to show real address
//to users, instead of a reversed one.
if( textReplace > -1 ) {
text = changeLetters( text );
element.innerHTML = text;
element.style.direction = "rtl";
element.style.unicodeBidi = "bidi-override";
element.style.whiteSpace = "nowrap";
}
//Since we have a rtl text, user can"t copy or click on a link.
//Therefore we"ll replace the value as soon as user hovers over the link.
if( element.addEventListener ) {
element.addEventListener("mouseover", reverseEmails, false);
} else {
element.attachEvent("onmouseover", reverseEmails);
}
}
Это может выглядеть как много кода, но это действительно просто и может быть разбито на несколько шагов:
- Объявить строку, используемую в качестве ключа,
characters - Заменить каждый символ обфусцированного электронного письма тем, который предшествует ему, на 30 позиций в ключе (при необходимости можно обтекать),или сохраните его, если он не является частью ключа
- Отмените результат и удалите лишние
@
Реализация этого в python должна занять всего несколько строк кода, иКак только вы это сделаете, вы сможете самостоятельно деобфусцировать электронные письма.