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File: js/cchat.js

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File: js/cchat.js
Role: Auxiliary data
Content type: text/plain
Description: Auxiliary data
Class: PHP Secure Chat
Chat box between users using encrypted messages
Author: By
Last change: revise and reformat cchat.js
Date: 3 years ago
Size: 14,350 bytes
 

Contents

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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));}