/*
File: notSpamMailto.js
Authors: Jean-Luc Hardy
Creation date: 18 May 2006
Language: JAVASCRIPT
Copyright: GNU GPL.
Liability: None, i.e. this program is provided as such, without any guarantee whatsoever.
Purpose:
-------
This script prevents an e-mail address to appear in HTML static page.
It should prevent possible spamers' robots to collect e-mail addresses automatically on web pages.
Installation:
------------
The present file must be inserted in the HTML file before the tag using the following instruction:
where "path/" must be replaced by the appropriate path.
Interface:
---------
The JavaScript function to be called is notSpamMailto(before,after)
where "before" and "after" are the characteres resp. before and after the at sign.
For example, the email address myname@mycompany.com will be called: notSpamMailto('myname','mycompany.com');
The javascript call is used instead of the mailto protocol in the href paramater of the tag.
For example: Contact us
To make things even more secure, it could be useful to add function calls as parameter of notSpamMailto.
For example, noSpamMailto(unscramble1('myname2',"myname1'),unscramble1('mycompany2',mycompany3','mycompany1"))
where unscramble1 and unscramble2 have to be created by the user of this script.
For example,
function unscramble1('myname2',"myname1') {return myname2+myname1;}
function unscramble2('mycompany2',mycompany3','mycompany1") {return mycompany1+mycompany2;} //mycompany3 not used.
*/
/**
*
* Base64 encode / decode
* http://www.webtoolkit.info/
*
**/
var Base64 = {
// private property
_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
// public method for encoding
encode : function (input) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = Base64._utf8_encode(input);
while (i < input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output +
this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
}
return output;
},
// public method for decoding
decode : function (input) {
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i < input.length) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = Base64._utf8_decode(output);
return output;
},
// private method for UTF-8 encoding
_utf8_encode : function (string) {
string = string.replace(/\r\n/g,"\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
},
// private method for UTF-8 decoding
_utf8_decode : function (utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while ( i < utftext.length ) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
}
else if((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
}
else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
}
var dWindow=null;
function noSpamMailto(before,after) {
var eMail=Base64.decode(before)+"@"+Base64.decode(after);
if((dWindow==null)||(dWindow.closed)) {
dWindow=window.open("mailto:" + eMail, "mailWindow",
"menubar=no,dependent=yes,height=50,width=260");
var ligneHead=
'e-mail to '
+ eMail
+ '' + String.fromCharCode(13);
var ligneBody=
'' + String.fromCharCode(13)
+ '' + String.fromCharCode(13)
+ 'Loading your
e-mail application...' + String.fromCharCode(13)
+ '
'
+ '' + String.fromCharCode(13)
+ "© Jean-Luc HARDY, distributed under GNU-GPL
" + String.fromCharCode(13)
// + "download: http://noSpamMailto.sourceforge.net
" + String.fromCharCode(13)
+ '' + String.fromCharCode(13);
dWindow.document.writeln(ligneHead);
dWindow.document.writeln(ligneBody);
dWindow.document.writeln();
var timerAvantClose= setTimeout("dWindow.close();",5000); // pour eviter le crash
}
}