From e1ad307b531c27ec6bfaf8b4d018991b0d4a78f3 Mon Sep 17 00:00:00 2001
From: winter
Date: Fri, 6 Dec 2024 20:43:26 +0000
Subject: initial commit

hardcoded functionality mostly!
---
 WpfTest/GlobalConfig.php                         |  25 ++++++
 WpfTest/HttpReturnStatus.php                     |   7 ++
 WpfTest/HttpReturnStatus/BadRequest.php          |  18 ++++
 WpfTest/HttpReturnStatus/InternalServerError.php |  16 ++++
 WpfTest/HttpReturnStatus/NoHandlerFound.php      |  18 ++++
 WpfTest/HttpReturnStatus/NotFound.php            |  18 ++++
 WpfTest/Router.php                               | 101 +++++++++++++++++++++++
 7 files changed, 203 insertions(+)
 create mode 100644 WpfTest/GlobalConfig.php
 create mode 100644 WpfTest/HttpReturnStatus.php
 create mode 100644 WpfTest/HttpReturnStatus/BadRequest.php
 create mode 100644 WpfTest/HttpReturnStatus/InternalServerError.php
 create mode 100644 WpfTest/HttpReturnStatus/NoHandlerFound.php
 create mode 100644 WpfTest/HttpReturnStatus/NotFound.php
 create mode 100644 WpfTest/Router.php

(limited to 'WpfTest')

diff --git a/WpfTest/GlobalConfig.php b/WpfTest/GlobalConfig.php
new file mode 100644
index 0000000..4bbfe68
--- /dev/null
+++ b/WpfTest/GlobalConfig.php
@@ -0,0 +1,25 @@
+<?php
+namespace WpfTest;
+
+class GlobalConfig {
+    private static GlobalConfig $instance;
+
+    private function __construct() {
+
+    }
+
+    public static function getInstance() {
+        if (!isset(self::$instance)) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+
+    public function getCanonicalHost(): string {
+        return $_SERVER['HTTP_HOST']; // for now this is fine
+    }
+
+    public function getBasePath(): string {
+        return 'http://' . $this->getCanonicalHost(); // fix this?
+    }
+}
\ No newline at end of file
diff --git a/WpfTest/HttpReturnStatus.php b/WpfTest/HttpReturnStatus.php
new file mode 100644
index 0000000..60622bb
--- /dev/null
+++ b/WpfTest/HttpReturnStatus.php
@@ -0,0 +1,7 @@
+<?php
+namespace WpfTest;
+
+interface HttpReturnStatus extends \Throwable {
+    public function httpCode(): int;
+    public function httpReason(): string;
+}
\ No newline at end of file
diff --git a/WpfTest/HttpReturnStatus/BadRequest.php b/WpfTest/HttpReturnStatus/BadRequest.php
new file mode 100644
index 0000000..83b5011
--- /dev/null
+++ b/WpfTest/HttpReturnStatus/BadRequest.php
@@ -0,0 +1,18 @@
+<?php
+namespace WpfTest\HttpReturnStatus;
+
+use WpfTest\HttpReturnStatus;
+
+class BadRequest extends \Exception implements HttpReturnStatus {
+    public function __construct(?string $reason) {
+        $this->message = $reason ?? 'Request does not conform to expectations';
+    }
+
+    public function httpCode(): int {
+        return 400;
+    }
+
+    public function httpReason(): string {
+        return "Bad Request";
+    }
+}
\ No newline at end of file
diff --git a/WpfTest/HttpReturnStatus/InternalServerError.php b/WpfTest/HttpReturnStatus/InternalServerError.php
new file mode 100644
index 0000000..0141e26
--- /dev/null
+++ b/WpfTest/HttpReturnStatus/InternalServerError.php
@@ -0,0 +1,16 @@
+<?php
+namespace WpfTest\HttpReturnStatus;
+
+use WpfTest\HttpReturnStatus;
+
+class InternalServerError extends \Exception implements HttpReturnStatus {
+    public function __construct(\Exception $reason) {
+        $this->message = $reason->getMessage();
+    }
+    public function httpCode(): int {
+        return 500;
+    }
+    public function httpReason(): string {
+        return "Internal Server Error";
+    }
+}
\ No newline at end of file
diff --git a/WpfTest/HttpReturnStatus/NoHandlerFound.php b/WpfTest/HttpReturnStatus/NoHandlerFound.php
new file mode 100644
index 0000000..d914ca2
--- /dev/null
+++ b/WpfTest/HttpReturnStatus/NoHandlerFound.php
@@ -0,0 +1,18 @@
+<?php
+namespace WpfTest\HttpReturnStatus;
+
+use WpfTest\HttpReturnStatus;
+
+class NoHandlerFound extends \Exception implements HttpReturnStatus {
+    public function __construct(string $path) {
+        $this->message = "No handler found for path $path";
+    }
+
+    public function httpCode(): int {
+        return 404;
+    }
+
+    public function httpReason(): string {
+        return "Not Found";
+    }
+}
\ No newline at end of file
diff --git a/WpfTest/HttpReturnStatus/NotFound.php b/WpfTest/HttpReturnStatus/NotFound.php
new file mode 100644
index 0000000..eef23b3
--- /dev/null
+++ b/WpfTest/HttpReturnStatus/NotFound.php
@@ -0,0 +1,18 @@
+<?php
+namespace WpfTest\HttpReturnStatus;
+
+use WpfTest\HttpReturnStatus;
+
+class NotFound extends \Exception implements HttpReturnStatus {
+    public function __construct(?string $reason) {
+        $this->message = $reason ?? 'Request was handled but no appropriate resource found';
+    }
+
+    public function httpCode(): int {
+        return 404;
+    }
+
+    public function httpReason(): string {
+        return "Not Found";
+    }
+}
\ No newline at end of file
diff --git a/WpfTest/Router.php b/WpfTest/Router.php
new file mode 100644
index 0000000..ea71657
--- /dev/null
+++ b/WpfTest/Router.php
@@ -0,0 +1,101 @@
+<?php
+namespace WpfTest;
+
+use WpfTest\HttpReturnStatus\InternalServerError;
+use WpfTest\HttpReturnStatus\NoHandlerFound;
+
+class Router {
+    private static Router $instance;
+
+    private readonly string $requestPath;
+    private array $routes;
+
+    private function __construct() {
+        $this->requestPath = $_GET['requestPath'] ?? $_SERVER['PATH_INFO'] ?? explode('?', $_SERVER['REQUEST_URI'], 2)[0] ?? '/';
+        $this->routes = [];
+    }
+
+    /**
+     * @return Router the singleton instance
+     */
+    public static function getInstance() {
+        if (!isset(self::$instance)) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+
+    public function processRequest() {
+        try {
+            $this->processRequestInner();
+        } catch (HttpReturnStatus $e) {
+            http_response_code($e->httpCode());
+            echo '<h1>' . $e->httpReason() . '</h1><pre>' . $e->getMessage() . '</pre>';
+        }
+    }
+
+    private function processRequestInner() {
+        try {
+            $route = $this->matchPath($this->requestPath);
+            if ($route == null) {
+                throw new NoHandlerFound($this->requestPath);
+            }
+            $route[1]($route[2]); // call handler with args
+        } catch (\Exception $e) {
+            if (is_a($e, HttpReturnStatus::class)) {
+                throw $e;
+            }
+            throw new InternalServerError($e);
+        }
+    }
+
+    public function mount(string $pathSpec, callable $handler) {
+        $this->routes[] = [$this->explodePathPieces($pathSpec), $handler];
+    }
+
+    private function explodePathPieces(string $pathSpec): array {
+        $pieces = explode('/', $pathSpec);
+        if ($pieces[0] == '')
+            array_shift($pieces);
+        return $pieces;
+    }
+
+    private function matchPath(string $requestPath): ?array {
+        // find matching candidates
+        $pieces = $this->explodePathPieces($requestPath);
+        $candidates = [];
+        foreach ($this->routes as $route) {
+            $routePieces = $route[0];
+            if (count($routePieces) != count($pieces))
+                continue;
+            $args = [];
+            $matches = true;
+            for ($i = 0; $i < count($pieces); $i++) {
+                if (str_starts_with($routePieces[$i], ':')) { // this is a parameter
+                    $args[substr($routePieces[$i], 1)] = $pieces[$i];
+                } elseif ($routePieces[$i] != $pieces[$i]) {
+                    $matches = false;
+                    break;
+                }
+            }
+            if ($matches) {
+                $candidates[] = [$route[0], $route[1], $args];
+            }
+        }
+
+        // select the best matching one (has the longest path, for now)
+        $bestScore = 0;
+        $bestItem = null;
+        foreach ($candidates as $c) {
+            $score = count($c[0]) - count(array_filter($c[0], function ($item) {
+                return str_starts_with($item, ':');
+            })) * 0.1;
+            if ($score > $bestScore) {
+                $bestItem = $c;
+                $bestScore = $score;
+            }
+        }
+        return $bestItem;
+    }
+
+}
-- 
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