// addressScrambler.js version 0.2.2
// copyright 2001, 2002, Josiah Q. Hamilton
// This software is provided under the Artistic license of the Open
// Source Initiative, as it exists on 2001-12-19, including the optional
// provision regarding aggregation with a commercial distribution.
// This notice must be included with any distribution.
// If you are using a server side component to scramble the
// addresses on their way out of the server, you must be using
// the same algorithm as this javascript uses to unscramble them,
// and for this one, you must have the same scramble string
var scrambleString = "some.arbitrary.ascii.string";
// This "private" function holds the scrambling algorithm
// The first argument is the text to be scrambled or unscrambled
// The second argument is boolean -- false if the text is to be
// scrambled or true if it is to be unscrambled
function _scramble(inText,inverse) {
var outText = "";
var scrambleLen = scrambleString.length;
for (var i = 0; i < inText.length; ++i) {
var currentCode = inText.charCodeAt(i);
var offset = scrambleString.charCodeAt(i % scrambleLen);
if (inverse) {
// offset should be non-negative, hence the 10*26 below
offset = 10 * 26 - offset;
}
var newCode = currentCode;
// caveat: the following lines assume ASCII encoding
if (currentCode == 46) {
newCode = 64; // replace '.' by '@'
} else if (currentCode == 64) {
newCode = 46; // replace '@' by '.'
} else if (65 <= currentCode && currentCode <= 90) {
newCode = (currentCode - 65 + offset) % 26 + 65;
} else if (97 <= currentCode && currentCode <= 122) {
newCode = (currentCode - 97 + offset) % 26 + 97;
}
outText += String.fromCharCode(newCode);
}
return outText;
}
// This function returns unscrambled text
// It takes scrambled text as an input
function descrambleText(inText) {
var outText = _scramble(inText,true);
return outText;
}
// This function returns scrambled text
// It takes unscrambled text as an input
function scrambleText(inText) {
var outText = _scramble(inText,false);
return outText;
}
// Function for testing
function testFunctions(addr) {
var scrambled = scrambleText(addr);
var descrambled = descrambleText(scrambled);
document.open();
document.write("<p> addr = '" + addr + "'");
document.write("<p> scramble(addr) = '" + scrambled + "'");
document.write("<p> descramble(scramble(addr)) = '" + descrambled + "'");
document.close();
}
function writeScrambledAddress(address) {
document.open();
document.write(scrambleText(address));
document.close();
}
function writeDescrambledAddress(scrambledAddress) {
document.open();
document.write(descrambleText(scrambledAddress));
document.close();
}
// This "public" function takes a scrambled address
// and a not-scrambled display text string
// and writes a mailto tag with them.
// Note that the display text is not scrambled when you
// use this function, so if the display text *is*
// also the address, you should use the function
// writeMailTo instead,
// and just use the scrambled address for the argument.
function writeMailToWithClearDisplayText(scrambledAddress, text) {
document.open();
document.write("<a href=\"mailto:" + descrambleText(scrambledAddress) + "\">" + text + "</a>");
document.close();
}
// This "public" function takes a scrambled address *and*
// scrambled display text, descrambles them both, and writes
// a mailto tag. This is useful when you want to hide the display
// text from harvesters for some reason. If you're simply using the
// address again as display text, it'll be easier to use the
// writeMailToUsingAddress function, which takes just one argument - the address
function writeMailToWithScrambledDisplayText(scrambledAddress, scrambledText) {
document.open();
document.write("<a href=\"mailto:" + descrambleText(scrambledAddress) + "\">" + descrambleText(scrambledText) + "</a>");
document.close();
}
// This "public" function writes a mailto tag using the
// address itself as the display value
function writeMailTo(scrambledAddress) {
writeMailToWithScrambledDisplayText(scrambledAddress, scrambledAddress);
}
// the following methods are only used by the helper pages
function getMailToWithClearDisplayText(scrambledAddress, text) {
return("<a href=\"mailto:" + descrambleText(scrambledAddress) + "\">" + text + "</a>");
}
function getMailTo(scrambledAddress) {
return("<a href=\"mailto:" + descrambleText(scrambledAddress) + "\">" + descrambleText(scrambledAddress) + "</a>");
}
function getMailToCode(scrambledAddress) {
return ("<script language=\"JavaScript\">writeMailTo('" + scrambledAddress + "');</script>");
}
function getEscapedMailToCode(scrambledAddress) {
return ("<script language="JavaScript">writeMailTo('" + scrambledAddress + "');</script>");
}
function getMailToCodeWithClearDisplayText(scrambledAddress, text) {
return ("<script language=\"JavaScript\">writeMailToWithClearDisplayText('" + scrambledAddress + ",'" + text + "');</script>");
}
function getEscapedMailToCodeWithClearDisplayText(scrambledAddress, text) {
return ("<script language="JavaScript">writeMailToWithClearDisplayText('" + scrambledAddress + "','"+ text + "');</script>");
}
