Added backend and refactored frond-end to support it.

* Removed unecesery home page
* Added PHP Api that provides auth and replaces the json-server for data storage
* Added support for alternate geocode-api
* Added registration  page

api/auth/check_session.php

@@ -0,0 +1,10 @@
+<?php
+require_once 'config/auth.php';
+
+session_start();
+if (isset($_SESSION['name'])) {
+    echo json_encode(['message' => 'Authorized', 'user' =>   $_SESSION['name'] , 'allowRegistration' => $AllowUserRegistration]);
+} else {
+    http_response_code(401);
+    echo json_encode(['message' => 'Unauthorized', 'allowRegistration' => $AllowUserRegistration]);
+}

api/auth/login.php

@@ -0,0 +1,32 @@
+<?php
+require_once 'config/db.php';
+
+$data = json_decode(file_get_contents("php://input"));
+
+if (isset($data->username) && isset($data->password)) {
+    $username = $data->username;
+    $password = $data->password;
+
+    $query = "SELECT * FROM users WHERE username = :username";
+    $stmt = $pdo->prepare($query);
+    $stmt->bindParam(':username', $username);
+    $stmt->execute();
+    $user = $stmt->fetch(PDO::FETCH_ASSOC);
+
+    if ($user && password_verify($password, $user['password'])) {
+        // Start a session and set session variables
+        session_start();
+        //$_SESSION['user_id'] = $user['id'];
+        $_SESSION['username'] = $user['username'];
+        $_SESSION['name'] = $user['name'];
+
+        echo json_encode(['message' => 'Login successful', 'username' => $user]);
+    } else {
+        http_response_code(401);
+        echo json_encode(['message' => 'Invalid credentials']);
+    }
+} else {
+    http_response_code(400);
+    echo json_encode(['message' => 'Missing username or password']);
+}
+?>

api/auth/logout.php

@@ -0,0 +1,7 @@
+<?php
+session_start();
+session_unset();
+session_destroy();
+
+echo json_encode(['success' => true]);
+?>

api/auth/register.php

@@ -0,0 +1,34 @@
+<?php
+require_once 'config/auth.php';
+
+if (!$AllowUserRegistration){
+    echo json_encode(['message' => 'Endpoint not found']);
+    http_response_code(404);
+    die;
+}
+
+require_once 'config/db.php';
+$data = json_decode(file_get_contents("php://input"));
+
+if (isset($data->username) && isset($data->password) && isset($data->name)) {
+    $username = $data->username;
+    $password = password_hash($data->password, PASSWORD_BCRYPT);
+    $name = $data->name;
+
+    $query = "INSERT INTO users (username, password, name) VALUES (:username, :password, :name)";
+    $stmt = $pdo->prepare($query);
+
+    $stmt->bindParam(':username', $username);
+    $stmt->bindParam(':password', $password);
+    $stmt->bindParam(':name', $name);
+
+    if ($stmt->execute()) {
+        echo json_encode(['message' => 'User registered successfully']);
+    } else {
+        echo json_encode(['message' => 'User registration failed']);
+    }
+} else {
+    http_response_code(400);
+    echo json_encode(['message' => 'Missing name, username or password']);
+}
+?>