first fully working version

index.js

@@ -1,8 +1,10 @@
-const http = require('http');
-const url = require('url');
-const fs = require('fs');
-const ws = require('ws');
+const http = require('http')
+const url = require('url')
+const fs = require('fs')
+const ws = require('ws')
 const redis = require('redis')
+const XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest
+const host = 'http://127.0.0.1:8080/'
 
 //redis client
 const redis_cli = redis.createClient()
@@ -32,10 +34,16 @@ http.createServer(function (req, res) {
       return res.end();
     })
   }else{
-    let url = redis_cli.hget("surl;"+q.pathname.split("/", 2)[1], "url")
-    res.writeHead(302, {'Location': 'http://adb.sh'});
-    //res.write(data);
+    redis_cli.hget("surl;"+q.pathname.split("/", 2)[1], "url", function(err, obj) {
+      if(err) console.log(err);
+      if(obj){
+        res.writeHead(302, {'Location': obj});
         return res.end();
+      }else{
+        res.writeHead(404, {'Content-Type': 'text/html'});
+        return res.end("404 this short-url does not exist :/");
+      }
+    });
   }
 }).listen(8080);
 
@@ -69,19 +77,38 @@ wss.on('connection', ws => {
     console.log(`Received message => ${message}`)
     let msg = `${message}`.split(";", 2)
     if (msg[0] === 'long_url') {
-      if (function valid_url(){
-        if (msg[1] === ''){ws.send('error;url is empty'); return false}
-        else if (msg[1].length > 2000){ws.send('error;your url is too long'); return false}
-        else return true
-      }() === true){
+      if (msg[1] === '') ws.send('error;url is empty')
+      else if (msg[1].length > 2000) ws.send('error;your url is too long')
+      else{
+        let xhr = new XMLHttpRequest();
+        console.log(msg[1])
+        xhr.open('GET', msg[1], true);
+        xhr.timeout = 2000;
+        xhr.ontimeout = function(e) {ws.send('error;url timed out')}
+        xhr.onreadystatechange = function() {
+          if (xhr.readyState === 4) {
+            switch(xhr.status) {
+              case 200:
                 let ran_key = get_key(8)
-        //redis_client.set("key", "value", redis.print)
+                //write to redis
                 redis_cli.hmset("surl;"+ran_key, "url", msg[1], "time", Date.now())
-        ws.send('short_url;http://127.0.0.1/'+ran_key)
+                ws.send('surl;'+host+ran_key)
+                console.log('key;'+ran_key)
+                break;
+              case 301: ws.send('error;the url is redirecting (301)');break;
+              case 302: ws.send('error;the url is redirecting (302)');break;
+              case 303: ws.send('error;the url is redirecting (303)');break;
+              case 404: ws.send('error;site does not exist (404)');break;
+              case 502: ws.send('error;remote server error (502)');break;
+              case 500: ws.send('error;remote server error (500)');break;
+              case 503: ws.send('error;remote server error (503)');break;
+              default: ws.send('error;no valid url');break;
+            }
+          }
+        }
+        xhr.send();
       }
     }
-    //ws.send('got your request: '+msg)
-    console.log(msg[0])
   })
   ws.send('websocket connected')
 })

package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "dependencies": {
     "redis": "^3.0.2",
-    "ws": "^7.3.1"
+    "ws": "^7.3.1",
+    "xmlhttprequest": "^1.8.0"
   }
 }

public/index.html

@@ -9,7 +9,7 @@
 			const socket = new WebSocket(wsurl)
 
 			socket.onopen = () => {
-				socket.send('new_session ')
+				socket.send('new session')
 			}
 			socket.onerror = (error) => {
 				console.log(`WebSocket error: ${error}`)
@@ -20,11 +20,18 @@
 				if (msg[0] === 'error') {
 					document.getElementById('error-message').innerText = msg[1]
 					document.getElementById('error-box').style.display = 'block'
+				} else if (msg[0] === 'surl') {
+					document.getElementById('surl-input').value = msg[1]
+					document.getElementById('new-user-box').style.display = 'block'
 				}
 			}
 			function short_url(){
 				socket.send('long_url '+document.getElementById('name-input').value)
 			}
+			function copy_url() {
+				document.getElementById('surl-input').select();
+				document.execCommand("copy");
+			}
 		</script>
 	</head>
 	<body>
@@ -42,6 +49,22 @@
 				</a>
 			</form>
 		</div>
+
+		<div class="box-dark" id="new-user-box">
+			<div class="login">
+					<div class="inputbox" id="surl">
+						<input class="input" id="surl-input" type="text" onblur="deselected('surl');" onfocus="selected('surl');" size="30" value="" maxlength="20" placeholder="surl">
+					</div>
+					<input type="hidden" value="search" name="login">
+					<div class="btn-green" id="copy-btn" onclick="copy_url()">
+						<div class="btn-text">copy</div>
+					</div>
+			</div>
+			<div onclick="visible('new-user-box','off')" style="position: absolute; top:5px; right: 5px;" class="sym_btn-invisible">
+				<img class="icon" src="sym/ic_close_white_24px.svg" />
+			</div>
+		</div>
+
 		<div id="error-box" class="error">
 			<div onclick="document.getElementById('error-box').style.display = 'none'" style="position: absolute; top:5px; right: 5px;" class="sym_btn-invisible">
 				<img class="icon" src="./sym/ic_close_white_24px.svg">

public/sym/dark.css

@@ -158,6 +158,12 @@ input[id="name-input"]::-webkit-input-placeholder {
     margin-left: calc(50% - 75px);
     margin-top: 20px;
 }
+#copy-btn {
+    position: absolute;
+    width: 150px;
+    margin-left: calc(50% - 75px);
+    margin-top: 20px;
+}
 #bottom-link-btn {
     position: fixed;
     width: 150px;