window.addEventListener("load", function() {Chatbox.loader();}, false);
window.addEventListener("unload", function() {Chatbox = null;}, false);
var Chatbox =
{
/**
* Crypto Chatbox.
*
* @author Martin Latter
* @copyright Martin Latter, 2010 (original), 2013 (encrypted)
* @version 2.05
* @license GNU GPL version 3.0 (GPL v3); http://www.gnu.org/licenses/gpl.html
* @link https://github.com/Tinram/CChat.git
*/
/* CONFIGURATION */
iCheckFreq: 6000, // 6-second checks
sFilePath: "includes/",
sCheckFile: "check.php",
sUpdateFile: "update.php",
sErrorBackground: "#ffcc66",
sDefaultBackground: "background:linear-gradient(to bottom, #fff, #f0f8ff 100%);",
bDebug: false,
/* END CONFIGURATION */
sBR: "<br>",
reLB: /\~/g, // line break symbol used
iDbGID: 0,
bSubmit: true, // multiple submission block
/**
* Setup event handlers.
*/
loader: function()
{
document.getElementById("message").onclick = function()
{
Chatbox.charCounter();
};
document.getElementById("chatsubmit").onclick = function()
{
if (Chatbox.checkBlankSubmission()) // if fn returns true, proceed with submission
{
if (Chatbox.bSubmit)
{
Chatbox.bSubmit = false;
Chatbox.checkUpdates(Chatbox.createUpdateObj(), "chatbox");
}
}
};
document.getElementById("message").onkeydown = Chatbox.charCounter;
document.getElementById("message").onkeyup = Chatbox.charCounter;
document.getElementById("decrypt").onclick = Chatbox.checkPass;
Chatbox.scrollDown();
Chatbox.charCounter(); // harmonise message box on page refresh if chars already added
Chatbox.checkUpdates(); // initial AJAX check with id=0
window.setInterval(Chatbox.checkUpdates, Chatbox.iCheckFreq); // incremental checks
},
/**
* Chatbox field scroll handler.
*/
scrollDown: function()
{
var oCB = document.getElementById("chatbox");
oCB.scrollTop = oCB.scrollHeight; // fix for lost position
},
/**
* Check user input.
*
* @return boolean
*/
checkBlankSubmission: function()
{
var
oName = document.getElementById("name"),
oPassword = document.getElementById("pw"),
oMessage = document.getElementById("message"),
oError = document.getElementById("error");
oName.style.cssText = this.sDefaultBackground;
oPassword.style.cssText = this.sDefaultBackground;
oMessage.style.cssText = this.sDefaultBackground;
if (oName.value === "" || oName.value === "name")
{
oError.innerHTML = "Please enter your name.";
oName.style.background = this.sErrorBackground;
oName.select();
oName.focus();
return false;
}
else if (oPassword.value === "")
{
oError.innerHTML = "Please enter your password.";
oPassword.style.background = this.sErrorBackground;
oPassword.select();
oPassword.focus();
return false;
}
else if (oMessage.value === "" || oMessage.value === "message")
{
document.getElementById("error").innerHTML = "Please enter a message.";
oMessage.style.background = this.sErrorBackground;
oMessage.select();
oMessage.focus();
return false;
}
else
{
oError.innerHTML = "";
return true;
}
},
/**
* Report and constrain character limit in message field.
*/
charCounter: function()
{
var
iMaxLimit = 255,
oField = document.getElementById("message"),
oCounter = document.getElementById("remchar");
if (oField.value.length > iMaxLimit)
{
oField.value = oField.value.substring(0, iMaxLimit);
}
else
{
oCounter.innerHTML = iMaxLimit - oField.value.length;
}
},
/**
* Filter certain characters, hash password, and encrypt message.
*
* @return object
*/
createUpdateObj: function()
{
var
sFileName = Chatbox.sFilePath + Chatbox.sUpdateFile,
sName = document.getElementById("name").value,
sPassword = document.getElementById("pw").value,
sMessage = document.getElementById("message").value;
sMessage = sMessage.replace(/£/g, "GBP-");
sMessage = sMessage.replace(/\r\n/g, "~");
sMessage = sMessage.replace(/\n/g, "~");
sMessage = Bf.e(SHA256(sPassword), sMessage);
sMessage = encodeURIComponent(sMessage); // do not remove = base64 character corruption
return {file: sFileName, name: sName, message: sMessage};
},
/**
* Check password field.
*/
checkPass: function()
{
var
oPassword = document.getElementById("pw"),
oError = document.getElementById("error"),
oCont = {},
oMessages = {},
i = -1,
n = 0,
sTemp = "";
if (oPassword .value === "")
{
oError.innerHTML = "Please enter your password.";
oPassword.style.background = Chatbox.sErrorBackground;
oPassword.select();
oPassword.focus();
return;
}
else
{
oPassword.style.background = "0"; // resets of any above errors
oError.innerHTML = "";
oError.style.background = "#fff";
oCont = document.getElementById("chatbox");
oMessages = oCont.getElementsByClassName("m");
n = oMessages.length;
for (; ++i < n;)
{
sTemp = Bf.d(SHA256(oPassword.value), oMessages[i].innerHTML);
sTemp = sTemp.replace(Chatbox.reLB, Chatbox.sBR);
oMessages[i].innerHTML = sTemp;
}
}
},
/**
* Check for new messages on the server using POST AJAX.
*
* @param object oPostData
* @param string sDiv
*/
checkUpdates: function(oPostData, sDiv)
{
var
sParams = "",
sFileName = "",
sUrl = "",
sCb = "",
sDMessage = "",
sBRprefix = ": <br>",
iRemGlobalID = 0,
iResponseLen = 0,
i = -1,
oXmlHttp = {},
oResponse = {},
oCb = {},
oMessage = {};
if (sDiv === undefined)
{
sFileName = Chatbox.sFilePath + Chatbox.sCheckFile;
iRemGlobalID = Chatbox.iDbGID;
sUrl = sFileName;
sParams = "id=" + Chatbox.iDbGID;
}
else
{
sFileName = oPostData.file;
sParams = "id=" + Chatbox.iDbGID + "&n=" + oPostData.name + "&m=" + oPostData.message;
}
oXmlHttp = createXHR();
oXmlHttp.open("POST", sFileName, true);
oXmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
oXmlHttp.onreadystatechange = function()
{
if (oXmlHttp.readyState === 4 || oXmlHttp.readyState === "complete")
{
if (oXmlHttp.status === 200 || oXmlHttp.status === 304)
{
oResponse = JSON.parse(oXmlHttp.responseText);
if (sDiv === undefined)
{
iResponseLen = oResponse.length;
oCb = document.getElementById("chatbox");
Chatbox.iDbGID = parseInt(oResponse[iResponseLen - 1].id, 10);
if (Chatbox.iDbGID > iRemGlobalID)
{
for (; ++i < iResponseLen;) // -1 will not work here for multiple submissions
{
if (document.getElementById("pw").value === "")
{
oCb.innerHTML += oResponse[i].n + ": " + oResponse[i].m + Chatbox.sBR;
Chatbox.scrollDown();
}
else
{
sDMessage = Bf.d(SHA256(document.getElementById("pw").value), oResponse[i].m);
sDMessage = sDMessage.replace(Chatbox.reLB, Chatbox.sBR);
oCb.innerHTML += oResponse[i].n + ": " + sDMessage + Chatbox.sBR; // responsible for intermittent duplicate message bug
Chatbox.scrollDown();
}
sCb = oCb.innerHTML;
if (sCb.lastIndexOf(sBRprefix) > - 1)
{
sCb = sCb.slice(0, sCb.length - 6); // remove colon when no results returned
oCb.innerHTML = sCb;
}
}
Chatbox.scrollDown();
}
}
else
{
oMessage = document.getElementById("message");
sDMessage = Bf.d(SHA256(document.getElementById("pw").value), oResponse.m);
sDMessage = sDMessage.replace(Chatbox.reLB, Chatbox.sBR);
document.getElementById(sDiv).innerHTML += oResponse.n + ": " + sDMessage + Chatbox.sBR;
oMessage.value = "";
oMessage.focus();
Chatbox.iDbGID = parseInt(oResponse.id, 10);
Chatbox.scrollDown();
Chatbox.charCounter();
}
}
else
{
if (Chatbox.bDebug)
{
alert("An error occurred: " + oXmlHttp.statusText);
}
}
}
Chatbox.bSubmit = true;
};
oXmlHttp.send(sParams);
function createXHR()
{
if (XMLHttpRequest !== undefined)
{
return new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
try
{
var oXMLHttp = new ActiveXObject("MSXML2.XMLHttp");
return oXMLHttp;
}
catch (xhrError)
{
alert("AJAX functionality is not supported (or trusted ActiveX has been disabled) in this version of IE.");
return false;
}
}
else
{
return false;
}
}
}
};
/* SHA-256 hash implementation by Angel Marin and Paul Johnston */
function SHA256(s){
var chrsz=8,hexcase=0;function sa(x,y){var lsw=(x&0xFFFF)+(y&0xFFFF),msw=(x>>16)+(y>>16)+(lsw>>16);return(msw<<16)|(lsw&0xFFFF);}function S(X,n){return(X>>>n)|(X<<(32-n));}function R(X,n){return(X>>>n);}function Ch(x,y,z){return((x&y)^((~x)&z));}function Maj(x,y,z){return((x&y)^(x&z)^(y&z));}function S0256(x){return(S(x,2)^S(x,13)^S(x,22));}function S1256(x){return(S(x,6)^S(x,11)^S(x,25));}function G0256(x){return(S(x,7)^S(x,18)^R(x,3));}function G1256(x){return(S(x,17)^S(x,19)^R(x,10));}function cs256(m,l){var a,b,c,d,e,f,g,h,i,j,ml,T1,T2,K=[0x428A2F98,0x71374491,0xB5C0FBCF,0xE9B5DBA5,0x3956C25B,0x59F111F1,0x923F82A4,0xAB1C5ED5,0xD807AA98,0x12835B01,0x243185BE,0x550C7DC3,0x72BE5D74,0x80DEB1FE,0x9BDC06A7,0xC19BF174,0xE49B69C1,0xEFBE4786,0xFC19DC6,0x240CA1CC,0x2DE92C6F,0x4A7484AA,0x5CB0A9DC,0x76F988DA,0x983E5152,0xA831C66D,0xB00327C8,0xBF597FC7,0xC6E00BF3,0xD5A79147,0x6CA6351,0x14292967,0x27B70A85,0x2E1B2138,0x4D2C6DFC,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],HASH=[0x6A09E667,0xBB67AE85,0x3C6EF372,0xA54FF53A,0x510E527F,0x9B05688C,0x1F83D9AB,0x5BE0CD19],W=new Array(64);m[l>>5]|=0x80<<(24-l%32);m[((l+64>>9)<<4)+15]=l;for(i=0,ml=m.length;i<ml;i+=16){a=HASH[0];b=HASH[1];c=HASH[2];d=HASH[3];e=HASH[4];f=HASH[5];g=HASH[6];h=HASH[7];for(j=-1;++j<64;){if(j<16){W[j]=m[j+i];}else{W[j]=sa(sa(sa(G1256(W[j-2]),W[j-7]),G0256(W[j-15])),W[j-16]);}T1=sa(sa(sa(sa(h,S1256(e)),Ch(e,f,g)),K[j]),W[j]);T2=sa(S0256(a),Maj(a,b,c));h=g;g=f;f=e;e=sa(d,T1);d=c;c=b;b=a;a=sa(T1,T2);}HASH[0]=sa(a,HASH[0]);HASH[1]=sa(b,HASH[1]);HASH[2]=sa(c,HASH[2]);HASH[3]=sa(d,HASH[3]);HASH[4]=sa(e,HASH[4]);HASH[5]=sa(f,HASH[5]);HASH[6]=sa(g,HASH[6]);HASH[7]=sa(h,HASH[7]);}return HASH;}function str2binb(str){var bin=[],i=0,l=0,mask=(1<<chrsz)-1;for(l=str.length;i<l*chrsz;i+=chrsz){bin[i>>5]|=(str.charCodeAt(i/chrsz)&mask)<<(24-i%32);}return bin;}function Utf8Encode(string){string=string.replace(/\r\n/g,"\n");var utftext="",c="",n=-1,l=string.length;for(;++n<l;){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;}function binb2hex(binarray){var hex_tab=hexcase?"0123456789ABCDEF":"0123456789abcdef";var str="",i=-1,l=0;for(l=binarray.length*4;++i<l;){str+=hex_tab.charAt((binarray[i>>2]>>((3-i%4)*8+4))&0xF)+hex_tab.charAt((binarray[i>>2]>>((3-i%4)*8))&0xF);}return str;}s=Utf8Encode(s);return binb2hex(cs256(str2binb(s),s.length*chrsz));}
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