optional proxy downloads for the project filesystem (directus#860)

.gitignore

@@ -56,3 +56,8 @@ composer.lock
 # This will make sure empty directories has at least one file so it can be tracked by git
 !**/.gitkeep
 /docs/
+
+#Override the PHP internal server rules for static files
+#See https://github.com/slimphp/Slim/issues/1829
+#php -S localhost:8000 cliserver.php
+public/cliserver.php

public/downloads/.htaccess

@@ -0,0 +1,2 @@
+RewriteEngine On
+RewriteRule (.*) index.php [L]

public/downloads/index.php

@@ -0,0 +1,94 @@
+<?php
+
+require __DIR__ . '/../../vendor/autoload.php';
+
+use Directus\Util\ArrayUtils;
+use Directus\Filesystem\Thumbnailer;
+
+$basePath = realpath(__DIR__ . '/../../');
+// Get Project name
+$projectName = \Directus\get_api_project_from_request();
+
+try {
+    $app = \Directus\create_app_with_project_name($basePath, $projectName);
+} catch (\Exception $e) {
+    http_response_code(404);
+    header('Content-Type: application/json');
+    echo json_encode([
+        'error' => [
+            'error' => 8,
+            'message' => 'API Project Configuration Not Found: ' . $projectName
+        ]
+    ]);
+    exit;
+}
+
+$filesystem = $app->getContainer()->get('filesystem')->getAdapter();
+
+//Remove the project name from the URL
+$path = urldecode(\Directus\get_virtual_path());
+if (substr($path, 0, strlen($projectName)) == $projectName) {
+    $path = substr($path, strlen($projectName));
+}
+
+$settings = \Directus\get_directus_proxy_downloads_settings();
+$timeToLive = \Directus\array_get($settings, 'proxy_downloads_cache_ttl', 86400);
+try {
+
+    //Forward HTTP headers
+    $metadata = $filesystem->getMetadata($path);
+
+    header('HTTP/1.1 200 OK');
+    if (array_key_exists('mimetype', $metadata)) {
+        header('Content-type: ' . $metadata['mimetype']);
+    } else {
+        $mimetype = $filesystem->getMimetype($path);
+        if ($mimetype) {
+            header('Content-type: ' . $mimetype);
+        }
+    }    
+    if (array_key_exists('size', $metadata)) {
+        header('Content-Length: ' . $metadata['size']);
+    } else {
+        $size = $filesystem->getSize($path);
+        if ($size) {
+            header('Content-Length: ' . $size);
+        }
+    }    
+    header("Pragma: cache");
+    header('Cache-Control: max-age=' . $timeToLive);
+    header('Last-Modified: '. gmdate('D, d M Y H:i:s \G\M\T', time()));
+    header('Expires: '. gmdate('D, d M Y H:i:s \G\M\T', time() + $timeToLive));
+
+    //Forward HTTP body
+    $resource = $filesystem->readStream($path);
+    ob_end_flush();
+    fpassthru($resource);
+    exit(0);
+}
+
+catch (Exception $e) {
+    $filePath = ArrayUtils::get($settings, 'proxy_downloads_not_found_location');
+    if (is_string($filePath) && !empty($filePath) && $filePath[0] !== '/') {
+        $filePath = $basePath . '/' . $filePath;
+    }
+
+    // TODO: Throw message if the error is a invalid configuration
+    if (file_exists($filePath)) {
+        $mime = mime_content_type($filePath);
+
+        // TODO: Do we need to cache non-existing files?
+        if ($mime) {
+            header('Content-type: ' . $mime);
+        }
+        header("Pragma: cache");
+        header('Cache-Control: max-age=' . $timeToLive);
+        header('Last-Modified: ' . gmdate('D, d M Y H:i:s \G\M\T', time()));
+        header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + $timeToLive));
+        echo file_get_contents($filePath);
+    } else {
+        http_response_code(404);
+    }
+
+    exit(0);
+}

src/helpers/file.php

@@ -117,6 +117,7 @@ function append_storage_information(array $rows, array $params = [])
         $container = Application::getInstance()->getContainer();
 
         $config = $container->get('config');
+        $proxyDownloads = $config->get('storage.proxy_downloads');
         $fileRootUrl = $config->get('storage.root_url');
         $hasFileRootUrlHost = parse_url($fileRootUrl, PHP_URL_HOST);
         $isLocalStorageAdapter = $config->get('storage.adapter') == 'local';
@@ -128,11 +129,17 @@ function append_storage_information(array $rows, array $params = [])
 
         foreach ($rows as &$row) {
             $data = [];
-            $data['url'] = $data['full_url'] = $fileRootUrl . '/' . $row['filename'];
 
-            // Add Full url
-            if ($isLocalStorageAdapter && !$hasFileRootUrlHost) {
+            if ($proxyDownloads) {
+                $data['url'] = get_proxy_path($row['filename']);
                 $data['full_url'] = get_url($data['url']);
+            } else {
+                $data['url'] = $data['full_url'] = $fileRootUrl . '/' . $row['filename'];
+
+                // Add Full url
+                if ($isLocalStorageAdapter && !$hasFileRootUrlHost) {
+                    $data['full_url'] = get_url($data['url']);
+                }
             }
 
             // Add Thumbnails
@@ -278,6 +285,27 @@ function get_thumbnail_path($name, $width, $height, $mode = 'crop', $quality = '
     }
 }
 
+if (!function_exists('get_proxy_path'))
+{
+    /**
+     * Returns a relative url for the given file pointing to the proxy
+     *
+     * @param string $path
+     *
+     * @return string
+     */
+    function get_proxy_path($path)
+    {
+        $projectName = get_api_project_from_request();
+
+        // env/width/height/mode/quality/name
+        return sprintf(
+            '/downloads/%s/%s',
+            $projectName, $path
+        );
+    }
+}
+
 if (!function_exists('filename_put_ext')) {
     /**
      * Appends an extension to a filename

src/helpers/settings.php

@@ -98,6 +98,21 @@ function get_directus_thumbnail_settings()
     }
 }
 
+if (!function_exists('get_directus_proxy_downloads_settings')) {
+    /**
+     * Get all directus files settings
+     *
+     * @return array
+     */
+    function get_directus_proxy_downloads_settings()
+    {
+        return get_directus_settings_by_keys([
+            'proxy_downloads_not_found_location',
+            'proxy_downloads_cache_ttl',
+        ]);
+    }
+}
+
 if (!function_exists('get_directus_settings_by_keys')) {
     /**
      * Get all directus files settings