legitimize.js

/*  
 *  Legitimize
 *  Requires the native JSON object || a comparable fill
 *  
 *  
 *  
**/

(function () {
var SML = {
    generateSanitizedHash: function (object) {
        return encodeURIComponent(this.Base64.encode(JSON.stringify(object)));
    },

    objectToHash: function (object) {
        return this.generateSanitizedHash({"page_params": object});
    },

    hashToObject: function (hash) {
        var obj = JSON.parse(this.Base64.decode(decodeURIComponent(hash)));
        return obj.page_params || obj;
    },

    Base64: {
        encode: function (text) {
            if (/([^\u0000-\u00ff])/.test(text)){
                throw new Error("Can't base64 encode non-ASCII characters.");
            }   
            var digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
                i = 0,
                cur, prev, byteNum,
                result=[];      
            
            while(i < text.length){
                cur = text.charCodeAt(i);
                byteNum = i % 3;
                switch(byteNum){
                    case 0: //first byte
                        result.push(digits.charAt(cur >> 2));
                        break;
                    case 1: //second byte
                        result.push(digits.charAt((prev & 3) << 4 | (cur >> 4)));
                        break;
                    case 2: //third byte
                        result.push(digits.charAt((prev & 0x0f) << 2 | (cur >> 6)));
                        result.push(digits.charAt(cur & 0x3f));
                        break;
                }
                prev = cur;
                i++;
            }
            
            if (byteNum == 0){
                result.push(digits.charAt((prev & 3) << 4));
                result.push("==");
            } else if (byteNum == 1){
                result.push(digits.charAt((prev & 0x0f) << 2));
                result.push("=");
            }
         
            return result.join("");
        }
    
        ,decode: function (text) {
            //ignore white space
            text = text.replace(/\s/g,"");
            //first check for any unexpected input
            if(!(/^[a-z0-9\+\/\s]+\={0,2}$/i.test(text)) || text.length % 4 > 0){
                throw new Error("Not a base64-encoded string.");
            }    
            //local variables
            var digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
                cur, prev, digitNum,
                i=0,
                result = [];
        
            //remove any equals signs
            text = text.replace(/=/g, "");
            //loop over each character
            while(i < text.length){
                cur = digits.indexOf(text.charAt(i));
                digitNum = i % 4;
                switch(digitNum){
                    //case 0: first digit - do nothing, not enough info to work with
                    case 1: //second digit
                        result.push(String.fromCharCode(prev << 2 | cur >> 4));
                        break;
                    case 2: //third digit
                        result.push(String.fromCharCode((prev & 0x0f) << 4 | cur >> 2));
                        break;
                    case 3: //fourth digit
                        result.push(String.fromCharCode((prev & 3) << 6 | cur));
                        break;
                }
                prev = cur;
                i++;
            }
            //return a string
            return result.join("");
        }        
    }
}

jQuery.prototype.legitimize = function (obj) {
    var href= this.attr('href'),
        hash,delimiter;
    if(href.indexOf('app_data') === -1) {
        hash = SML.objectToHash(obj || this.data());
        delimiter = (href.indexOf('?') === -1)?'?':'&';
        this.attr('href', href.concat(delimiter,'app_data=',hash) );
    }
    return this;
};
}());

PageParams.js

var PageParams = {
    generateSanitizedHash: function (object) {
        return encodeURIComponent(this.Base64.encode(JSON.stringify(object)));
    },

    objectToHash: function (object) {
        return this.generateSanitizedHash({"page_params": object});
    },

    hashToObject: function (hash) {
        var obj = JSON.parse(this.Base64.decode(decodeURIComponent(hash)));
        return obj.page_params || obj;
    },

    Base64: {
        encode: function (text) {
            if (/([^\u0000-\u00ff])/.test(text)){
                throw new Error("Can't base64 encode non-ASCII characters.");
            }   
            var digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
                i = 0,
                cur, prev, byteNum,
                result=[];      
            
            while(i < text.length){
                cur = text.charCodeAt(i);
                byteNum = i % 3;
                switch(byteNum){
                    case 0: //first byte
                        result.push(digits.charAt(cur >> 2));
                        break;
                    case 1: //second byte
                        result.push(digits.charAt((prev & 3) << 4 | (cur >> 4)));
                        break;
                    case 2: //third byte
                        result.push(digits.charAt((prev & 0x0f) << 2 | (cur >> 6)));
                        result.push(digits.charAt(cur & 0x3f));
                        break;
                }
                prev = cur;
                i++;
            }
            
            if (byteNum == 0){
                result.push(digits.charAt((prev & 3) << 4));
                result.push("==");
            } else if (byteNum == 1){
                result.push(digits.charAt((prev & 0x0f) << 2));
                result.push("=");
            }
         
            return result.join("");
        }
    
        ,decode: function (text) {
            //ignore white space
            text = text.replace(/\s/g,"");
            //first check for any unexpected input
            if(!(/^[a-z0-9\+\/\s]+\={0,2}$/i.test(text)) || text.length % 4 > 0){
                throw new Error("Not a base64-encoded string.");
            }    
            //local variables
            var digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
                cur, prev, digitNum,
                i=0,
                result = [];
        
            //remove any equals signs
            text = text.replace(/=/g, "");
            //loop over each character
            while(i < text.length){
                cur = digits.indexOf(text.charAt(i));
                digitNum = i % 4;
                switch(digitNum){
                    //case 0: first digit - do nothing, not enough info to work with
                    case 1: //second digit
                        result.push(String.fromCharCode(prev << 2 | cur >> 4));
                        break;
                    case 2: //third digit
                        result.push(String.fromCharCode((prev & 0x0f) << 4 | cur >> 2));
                        break;
                    case 3: //fourth digit
                        result.push(String.fromCharCode((prev & 3) << 6 | cur));
                        break;
                }
                prev = cur;
                i++;
            }
            //return a string
            return result.join("");
        }        
    }
}