check for existing user

index.js

@@ -24,6 +24,8 @@ app.post('/auth/login', async function(req, res) {
     let username = req.body.username.trim();
     let password = req.body.password.trim();
 
+    await loginUser(username, password);
+
     async function loginUser (username, password) {
         if (username && password) {
             try {
@@ -44,35 +46,30 @@ app.post('/auth/login', async function(req, res) {
             res.send('Please enter Username and Password!');
         }
         res.end();
-
     }
 });
 
-app.post('/auth/signup', (req, res) => {
+app.post('/auth/signup', async (req, res) => {
 
     let username = req.body.username.trim();
     let password = req.body.password.trim();
 
     insertAccount(username, password);
-
-    async function insertAccount(username, password){
-        const query = `
-            INSERT INTO accounts (username, password)
-            VALUES ($1, $2)
-            RETURNING *;
-          `;
-        const values = [username, password];
-
-        try {
-            const signupData = await client.query(query, values);
-            console.log('Account created:', signupData.rows[0]);
-            res.status(200).send("Account successfully created <a href=/login>Login screen</a>");
-        } catch (err) {
-            console.error('Error inserting data:', err.stack);
-            res.status(500).send('Error inserting data');
+    try {
+        const exists = await isUserExists(username);
+        if (exists) {
+            console.log('User already exists');
+            res.status(500).send('User already exists!');
+            return;
         }
+        await insertAccount(username, password);
+        res.status(200).send("Account successfully created <a href=/login>Login screen</a>");
+    } catch (err) {
+        console.error('Error inserting data:', err);
+        res.status(500).send('Error inserting data');
     }
-})
+});
+
 app.get('/login', (req, res) => {
     res.sendFile(path.join(__dirname, '/public/routes/login.html'));
 })
@@ -87,4 +84,32 @@ app.get('/', (req, res) => {
 
 app.listen(port, () => {
     console.log(`Example app listening on port ${port}`)
-})
+})
+
+
+async function isUserExists(username) {
+    try {
+        const query = 'SELECT COUNT(*) FROM accounts WHERE username = $1';
+        const result = await client.query(query, [username]);
+        return result.rows[0].count > 0;
+    } catch (err) {
+        console.error('Error checking username:', err);
+        throw err;
+    }
+}
+
+async function insertAccount(username, password){
+    const query = `
+            INSERT INTO accounts (username, password)
+            VALUES ($1, $2)
+            RETURNING *;
+          `;
+    const values = [username, password];
+
+    try {
+        const signupData = await client.query(query, values);
+        console.log('Account created:', signupData.rows[0]);
+    } catch (err) {
+        console.error('Error inserting data:', err.stack);
+    }
+}

public/js/signup.js

@@ -19,6 +19,4 @@ document.getElementById('signupForm').addEventListener('submit',async function (
         alert("Passwords don't match!");
         event.preventDefault();
     }
-
-
 })