Implement user authentication and registration; enhance error handling and database interaction in API

.env

@@ -0,0 +1 @@
+TOKEN_SIGNATURE=281361f952279bd9530734c67ed04aed2756f0fe00cb998cd6c28324f491484c

api/api.php

@@ -1,13 +1,19 @@
 <?php
 // API Main Library
 class gbAPI {
-    public $authRequired;
-
-    function __construct() {
+    function __construct($authRequired) {
         define("APP_PATH", __DIR__ . "/../");
 
-        if ($this->authRequited) {
-            $this->checkAuth();
+        if ($authRequired) {
+            if (!$this->checkAuth()) {
+                $status = 401;
+                $data = [
+                    "error" => "unauthorized",
+                    "error_text" => "Authentication failed."
+                ];
+
+                $this->answer($status, $data);
+            }
         }
     }
 
@@ -15,26 +21,73 @@ class gbAPI {
         return parse_ini_file(APP_PATH . ".env");
     }
 
-    function generateToken() {
+    function generateToken($username) {
         $config = $this->getConfig();
 
         // Generate Token
-        $token = bin2hex(random_bytes(32));
-        $secret = $config["COOKIE_SIGNATURE"];
+        $payload = [
+            "user" => $username,
+            "auth" => true
+        ];
+        $string = json_encode($payload);
+        $secret = $config["TOKEN_SIGNATURE"];
 
-        return hash_hmac('sha256', $token, SECRET, true);
+        return hash_hmac("sha256", $string, $secret);
     }
 
     function checkAuth() {
-        if (isset($_SERVER))
+        if (!isset($_SERVER["HTTP_X_API_KEY"]) && !isset($_COOKIE["auth_token"])) {
+            return false;
+        }elseif (isset($_COOKIE["auth_token"]) && isset($_COOKIE["username"])) {
+            // Check Token
+            $username = $_COOKIE["username"];
+            $expected = $this->generateToken($username);
+            $given = $_COOKIE["auth_token"];
+
+            $result = hash_equals($expected, $give);
+            if ($result) {
+                return true;
+            }
+        }elseif (isset($_SERVER["HTTP_X_API_KEY"])) {
+            // Decode Token
+            $payload = json_decode(base64_decode($_SERVER["HTTP_X_API_KEY"]), true);
+            $username = $payload["username"];
+
+            $given = $payload["auth_token"];
+            $expected = $this->generateToken($username);
+
+            $result = hash_equals($expected, $given);
+            if ($result) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
     function answer($status, $data) {
         http_response_code($status);
+        Header ("Content-Type: application/json; charset=UTF-8");
 
         $data = json_encode($data);
 
-        $json = '{"status":' . $status . ',"data":' $data . '}';
+        $json = '{"status":' . $status . ',"data":' . $data . '}';
         die($json);
     }
+
+    function dbCommand($command, $expectResult, $stmtArgsRequired = false, $stmtArgs = []) {
+        $db_path = APP_PATH . "database.db";
+
+        $db = new PDO("sqlite:" . $db_path);
+        $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+        $stmt = $db->prepare($command);
+        $stmt->execute($stmtArgs);
+
+        if ($expectResult) {
+            $result = $stmt->fetch(PDO::FETCH_ASSOC);
+
+            return $result;
+        }
+    }
 }

api/auth/login.php

@@ -0,0 +1,50 @@
+<?php
+// Load API Library
+require "../api.php";
+
+$api = new gbAPI(false);
+
+// Check Request Body
+if ($_SERVER["REQUEST_METHOD"] !== "POST") {
+    $api->answer(400, [
+        "error" => "false_request_method",
+        "error_text" => "Only POST allowed"
+    ]);
+}
+
+if (!isset($_POST["username"]) || !isset($_POST["password"])) {
+    $api->answer(400, [
+        "error" => "missing_fields",
+        "error_text" => "Some fields are missing"
+    ]);
+}
+
+$username = $_POST["username"];
+$password = $_POST["password"];
+
+// Prepare SQL Command
+$hash = hash("sha256", $password);
+
+$command = "SELECT username, password FROM users WHERE username = :username AND password = :password";
+$args = [
+    ":username" => $username,
+    ":password" => $password
+];
+
+// Execute SQL Command
+$result = $api->dbCommand($command, true, true, $args);
+
+// Check Result
+if ($result) {
+    // Login successful. Generate Auth Token
+    $token = $api->generateToken($username);
+
+    // Set cookies
+    setcookie("auth_token", $token, time() + 86400, "/");
+    setcookie("username", $username, time() + 86400, "/");
+}else{
+    $api->answer(401, [
+        "error" => "unauthorized",
+        "error_text" => "A user with this password does not exists."
+    ]);
+}

api/setup/save.php

@@ -2,4 +2,39 @@
 // Load Main Libary
 require "../api.php";
 
-bin2hex(random_bytes(32))
+$api = new gbAPI(true);
+
+// Check Request body
+if ($_SERVER["REQUEST_METHOD"] !== "POST") {
+    $api->answer(400, [
+        "error" => "false_request_method",
+        "error_text" => "Only POST allowed"
+    ]);
+}
+
+if (!isset($_POST["username"]) || !isset($_POST["password"]) || !isset($_POST["password_repeat"])) {
+    $api->answer(400, [
+        "error" => "missing_fields",
+        "error_text" => "Some fields are missing"
+    ]);
+}
+
+$username = $_POST["username"];
+$password = $_POST["password"];
+$password_repeat = $_POST["password_repeat"];
+
+// Check Passwords
+if ($password !== $password_repeat) {
+    $api->answer(400, [
+        "error" => "passwords_dont_match",
+        "error_text" => "The passwords does not match."
+    ]);
+}
+
+// Hash Password
+$hash = hash("sha256", $password);
+
+
+
+// CREATE DATABASE STRUCTURE
+file_get_contents(APP_PATH . "db_structure.sql");

public/templates/setup/setup.html

@@ -100,7 +100,8 @@
                 method: "POST",
                 body: JSON.stringify({
                     username: username,
-                    password: password
+                    password: password,
+                    password_repeat: password_repeat
                 }),
                 headers: {
                     "Content-type": "application/json; charset=UTF-8"

public/test.php

@@ -1,7 +1,14 @@
 <?php
 
-foreach($_SERVER as $key => $value) {
+/*foreach($_SERVER as $key => $value) {
     echo $key . " === " . $value . "<br>";
-}
+}*/
 
 //echo $_SERVER["HTTP_X_API_KEY"];
+
+$string = '{"user":"marc", "auth":true}';
+$secret = "281361f952279bd9530734c67ed04aed2756f0fe00cb998cd6c28324f491484c";
+
+echo "Hash: " . hash_hmac("sha256", $string, $secret);
+
+echo "Decode: " . hash_equals($string, $secret);