Update file permissions and enhance error handling in login template and setup scripts

public/templates/login/login.html

@@ -36,6 +36,7 @@
         <div class="center">
             <h1 class="md-typescale-display-large">%appname%</h1>
             <h3 class="md-typescale-display-medium">Admin Panel Login</h3><br><br>
+            <p class="md-typescale-body-medium" id="error_msg" style="display: none;"></p>
             <md-filled-text-field type="text" id="login_username" placeholder="Username"></md-filled-text-field><br><br>
             <md-filled-text-field type="password" id="login_password" placeholder="Password"></md-filled-text-field><br><br>
             <md-filled-button id="login_button">Login</md-filled-button>
@@ -46,6 +47,29 @@
             var username = document.getElementById("login_username").value;
             var password = document.getElementById("login_password").value;
 
+            fetch("/api/auth/login.php", {
+                method:"POST",
+                body: JSON.stringify({
+                    username: username,
+                    password: password
+                }),
+                headers: {
+                    "Content-type": "application/json; charset=UTF-8"
+                }
+            })
+            .then(response => response.json())
+            .then(data => {
+                if (data.status == 200) {
+                    window.location.reload();
+                }else{
+                    document.getElementById("error_msg").innerHTML = data.error_text;
+                    document.getElementById("error_msg").style.display = "block";
+                }
+            })
+            .catch(error => {
+                document.getElementById("error_msg").innerHTML = error;
+                document.getElementById("error_msg").style.display = "block";
+            })
         });
     </script>
 </body>