From 63f7ef5eeedc805ba3357c434d3caf5ec793a59d Mon Sep 17 00:00:00 2001
From: Johannes Kantz <67144859+JohannesKantz@users.noreply.github.com>
Date: Thu, 8 Dec 2022 14:43:05 +0100
Subject: [PATCH] add: Router

---
 Router/Response.php |  44 +++++++++
 Router/Route.php    |  49 ++++++++++
 Router/Router.php   | 227 ++++++++++++++++++++++++++++++++++++++++++++
 index.php           |  15 +++
 4 files changed, 335 insertions(+)
 create mode 100644 Router/Response.php
 create mode 100644 Router/Route.php
 create mode 100644 Router/Router.php

diff --git a/Router/Response.php b/Router/Response.php
new file mode 100644
index 0000000..bfd335c
--- /dev/null
+++ b/Router/Response.php
@@ -0,0 +1,44 @@
+<?php namespace Router;
+
+class Response
+{
+
+    /**
+     * Send a response
+     * @param string $data
+     * @param int? $status
+     * @return void
+     */
+    public function send(string $data, int $status = null)
+    {
+        if (isset($status)) {
+            http_response_code($status);
+        }
+        echo $data;
+    }
+
+    /**
+     * Send a json response
+     * @param array $data
+     * @param int? $status
+     * @return void
+     */
+    public function json(array $data, int $status = null)
+    {
+        if (isset($status)) {
+            http_response_code($status);
+        }
+        header('Content-Type: application/json; charset=utf-8');
+        echo json_encode($data);
+    }
+
+    /**
+     * Set the status code
+     * @param int $status
+     * @return void
+     */
+    public function status(int $status)
+    {
+        http_response_code($status);
+    }
+}
\ No newline at end of file
diff --git a/Router/Route.php b/Router/Route.php
new file mode 100644
index 0000000..ca5a4f0
--- /dev/null
+++ b/Router/Route.php
@@ -0,0 +1,49 @@
+<?php namespace Router;
+
+
+class Route
+{
+    private array $methods = [];
+
+    public function __construct(string $method = null, $controller = null)
+    {
+        if ($method != null && $controller != null) {
+            $this->methods[$method] = $controller;
+        }
+    }
+
+    public function get($controller)
+    {
+        $this->methods["GET"] = $controller;
+        return $this;
+    }
+
+    public function post($controller)
+    {
+        $this->methods["POST"] = $controller;
+        return $this;
+    }
+
+    public function put($controller)
+    {
+        $this->methods["PUT"] = $controller;
+        return $this;
+    }
+
+    public function delete($controller)
+    {
+        $this->methods["DELETE"] = $controller;
+        return $this;
+    }
+
+    public function all($controller)
+    {
+        $this->methods["ALL"] = $controller;
+        return $this;
+    }
+
+    public function getController(string $method)
+    {
+        return $this->methods[$method] ?? $this->methods["ALL"];
+    }
+}
\ No newline at end of file
diff --git a/Router/Router.php b/Router/Router.php
new file mode 100644
index 0000000..936dd4f
--- /dev/null
+++ b/Router/Router.php
@@ -0,0 +1,227 @@
+<?php namespace Router;
+
+require_once("Response.php");
+require_once("Route.php");
+
+class Router
+{
+    private string $uri;
+    private string $requestType;
+
+    private array $routes;
+    private array $middleware;
+
+    private array $request;
+    private Response $response;
+
+    /**
+     * Router
+     */
+    public function __construct(string $pathname)
+    {
+        $this->uri = is_countable($_SERVER['REQUEST_URI']) && count($_SERVER['REQUEST_URI']) > 1 ? rtrim($_SERVER['REQUEST_URI'], "/") : $_SERVER['REQUEST_URI'];
+        $this->uri = str_replace($pathname, "", $this->uri);
+        $this->requestType = $_SERVER['REQUEST_METHOD'];
+        $this->routes = [];
+        $this->middleware = [];
+
+        if (isset($_SERVER)) {
+            $this->request = $_SERVER;
+        }
+        if (isset($_POST)) {
+            $this->request["body"] = $_POST;
+        }
+        if (isset($_POST)) {
+            $this->request["params"] = $_GET;
+        }
+
+        $this->response = new Response();
+    }
+
+
+    /**
+     * Use Middleware
+     * @param string $uri
+     * @param $middleware
+     * @return void
+     */
+    public function use(string $uri, callable $middleware): void
+    {
+        $this->middleware[$uri] = $middleware;
+    }
+
+    /**
+     * get Middleware for uri
+     * @param string $uri
+     * @return array
+     */
+    private function getMiddleware(): array
+    {
+        $middleware = [];
+        foreach ($this->middleware as $key => $value) {
+            if (str_starts_with($this->uri, $key)) {
+                $middleware[] = $value;
+            }
+        }
+        return $middleware;
+    }
+
+    /**
+     * Calls the middleware
+     * @param array $middleware
+     * @return void
+     */
+    private function callMiddleware(array $middleware): void
+    {
+        foreach ($middleware as $m) {
+            $m($this->request, $this->response);
+        }
+    }
+
+    /**
+     * GET Method
+     * @param string $uri
+     * @param $controller
+     * @return void
+     */
+    public function get(string $uri, callable $controller): void
+    {
+        $this->routes[$uri] = new Route("GET", $controller);
+    }
+
+    /**
+     * POST Method
+     * @param string $uri
+     * @param $controller
+     * @return void
+     */
+    public function post(string $uri, callable $controller): void
+    {
+        $this->routes[$uri] = new Route("POST", $controller);
+    }
+
+    /**
+     * PUT Method
+     * @param string $uri
+     * @param $controller
+     * @return void
+     */
+    public function put(string $uri, callable $controller): void
+    {
+        $this->routes[$uri] = new Route("PUT", $controller);
+    }
+
+    /**
+     * DELETE Method
+     * @param string $uri
+     * @param $controller
+     * @return void
+     */
+    public function delete(string $uri, callable $controller): void
+    {
+        $this->routes[$uri] = new Route("DELETE", $controller);
+    }
+
+    /**
+     * ALL Method
+     * @param string $uri
+     * @param $controller
+     * @return void
+     */
+    public function all(string $uri, callable $controller): void
+    {
+        $this->routes[$uri] = new Route("ALL", $controller);
+    }
+
+    /**
+     * Route
+     * @param string $uri
+     * @return void
+     */
+    public function route(string $uri): Route
+    {
+        $this->routes[$uri] = new Route($uri);
+        return $this->routes[$uri];
+    }
+
+    /**
+     * Checks if the given uri matches the given route
+     * @param string $uri
+     * @param array $params
+     * @return string
+     */
+    private function routeMatches(string $route, string $uri): bool
+    {
+        $routeParts = explode("/", $route);
+        $uriParts = explode("/", $uri);
+
+        if (count($routeParts) !== count($uriParts)) {
+            return false;
+        }
+        foreach ($routeParts as $key => $part) {
+            if (str_starts_with($part, ":")) {
+                continue;
+            }
+            if ($part !== $uriParts[$key]) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Returns the params of the given uri
+     * given that the uri matches the given route
+     * @param string $uri
+     * @param array $params
+     * @return array
+     */
+    private function getParams(string $route, string $uri): array
+    {
+        $routeParts = explode("/", $route);
+        $uriParts = explode("/", $uri);
+
+        $params = [];
+        foreach ($routeParts as $key => $part) {
+            if (str_starts_with($part, ":")) {
+                $params[ltrim($part, ":")] = $uriParts[$key];
+            }
+        }
+        return $params;
+    }
+
+    /**
+     * gets the controller for the given uri
+     * @param array $routes
+     */
+    private function getController(): callable|bool
+    {
+        foreach ($this->routes as $uri => $route) {
+            if ($this->uri === $uri) {
+                return $route->getController($this->requestType) ?? false;
+            }
+            if ($this->routeMatches($uri, $this->uri)) {
+                $this->request["params"] = $this->getParams($uri, $this->uri);
+                return $route->getController($this->requestType) ?? false;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Starts the router
+     * @return void
+     */
+    public function start(): void
+    {
+        $middleware = $this->getMiddleware();
+        $this->callMiddleware($middleware);
+
+        $controller = $this->getController();
+        if ($controller) {
+            $controller($this->request, $this->response);
+        } else {
+            echo "404";
+        }
+    }
+}
\ No newline at end of file
diff --git a/index.php b/index.php
index b3d9bbc..9be39bc 100644
--- a/index.php
+++ b/index.php
@@ -1 +1,16 @@
 <?php
+
+require_once("Router/Router.php");
+require_once("Router/Response.php");
+
+use Router\Response;
+use Router\Router;
+
+$app = new Router("/DirektiveDesDons");
+
+
+$app->get("/", function (array $req, Response $res) {
+    $res->send("Hello World");
+});
+
+$app->start();
\ No newline at end of file