Merge pull request 'implement cors' (#30) from implement-cors into master

Reviewed-on: #30

src/Response/HttpResponse.php

@@ -55,6 +55,11 @@ class HttpResponse
 
     public function render(): void
     {
+        $this->handleCors();
+        if ($this->method === 'options') {
+            return;
+        }
+
         $match = $this->routeCollection->match($this->method, $this->parsedUrl['path']);
         if ($match === null) {
             $this->render404();
@@ -110,6 +115,56 @@ class HttpResponse
         }
     }
 
+    private function handleCors(): void
+    {
+        $origin = $this->request->header('Origin');
+        if (!$origin) {
+            return;
+        }
+
+        if (isset($this->appConfig['cors']['allow_origins'])) {
+            if (in_array($origin, $this->appConfig['cors']['allow_origins']) || in_array('*', $this->appConfig['cors']['allow_origins'])) {
+                header("Access-Control-Allow-Origin: {$origin}");
+            }
+        }
+
+        if (!empty($this->appConfig['cors']['allow_credentials'])) {
+            header('Access-Control-Allow-Credentials: true');
+        }
+
+        if ($this->method !== 'options') {
+            return;
+        }
+
+        if (isset($this->appConfig['cors']['allow_headers'])) {
+            $headers = explode(',', $this->request->header('Access-Control-Request-Headers'));
+            if (in_array('*', $this->appConfig['cors']['allow_headers'])) {
+                $allow_headers = $headers;
+            } else {
+                $allow_headers = array_intersect($this->appConfig['cors']['allow_headers'], $headers);
+            }
+
+            if (count($allow_headers) > 0) {
+                header('Access-Control-Allow-Headers: ' . join(', ', $allow_headers));
+            }
+        }
+
+        if (isset($this->appConfig['cors']['allow_methods'])) {
+            if (in_array('*', $this->appConfig['cors']['allow_methods'])) {
+                $allow_methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'PATCH', 'POST', 'PUT'];
+            } else {
+                $allow_methods = $this->appConfig['cors']['allow_methods'];
+            }
+
+            if (count($allow_methods) > 0) {
+                header('Access-Control-Allow-Methods: ' . join(', ', $allow_methods));
+            }
+        }
+
+        $max_age = $this->appConfig['cors']['max_age'] ?? 600;
+        header("Access-Control-Max-Age: {$max_age}");
+    }
+
     private function redirectToLogin(): void
     {
         $this->request->session()->set('redirect_after_login', $this->rawUrl);