create config and utils

app/utils.js

@@ -0,0 +1,26 @@
+var alphabet = "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
+var base = alphabet.length;
+
+function encode(num){
+ var encoded = '';
+ while (num){
+ var remainder = num % base;
+ num = Math.floor(num / base);
+ encoded = alphabet[remainder].toString() + encoded;
+ }
+ return encoded;
+}
+
+function decode(str){
+ var decoded = 0;
+ while (str){
+ var index = alphabet.indexOf(str[0]);
+ var power = str.length - 1;
+ decoded += index * (Math.pow(base, power));
+ str = str.substring(1);
+ }
+ return decoded;
+}
+
+module.exports.encode = encode;
+module.exports.decode = decode;

config/config.js

@@ -0,0 +1,9 @@
+var config = {};
+
+config.db = {};
+config.webhost = 'https://localhost:3000/';
+
+config.db.host = 'localhost';
+config.db.name = 'url_shortener';
+
+module.exports = config;