- Migrated from https://github.com/Yetangitu/owncloud-apps

- substantial bit rot accrued in 4 years of non-maintenance which made Reader unusable
 - Reader now works reliably on public pages - or at least it _Works For Me™_

 - Refactored a substantial part of the code to comply to the "current" (ha ha) Nextcloud API
 - Dropped Owncloud compatibility for lack of a testing installation
 - Dropped IE (<11) support
 - Dropped compatibility with older (<20) Nextcloud versions
 - Dropped app-specific ajax code, now handled by SettingsController
 - Updated dependencies where applicable

lib/Service/MetadataService.php

@@ -0,0 +1,75 @@
+<?php
+/**
+ * @author Frank de Lange
+ * @copyright 2017 Frank de Lange
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OCA\Files_Reader\Service;
+
+use OCP\App\IAppManager;
+
+class MetadataService {
+
+    private $appManager;
+
+    /**
+     * @param IAppManager $appManager
+     */ 
+    public function __construct(IAppManager $appManager) {
+        $this->appManager = $appManager;
+    }
+
+    /**
+     * @brief get metadata item(s)
+     *
+     * @param int $fileId
+     * @param string $name
+     *
+     * @return array
+     */
+    public function get($fileId, $name=null) {
+        if ($this->appManager->isInstalled('files_opds')) {
+            if ($meta = \OCA\Files_Opds\Meta::get($fileId)) {
+                if (!empty($name) && array_key_exists($name, $meta)) {
+                    return [$item => $meta[$name]];
+                } else {
+                    return $meta;
+                }
+            }
+        }
+
+        return [];
+    }
+
+    /**
+     * @brief write metadata to database
+     *
+     * @param int $fileId
+     * @param array $value
+     *
+     * @return array
+     */
+    public function setAll($fileId, $value) {
+        // no-op for now
+        return [];
+    }
+
+    /**
+     * @brief write metadata item to database
+     *
+     * @param int $fileId
+     * @param string $name
+     * @param array $value
+     *
+     * @return array
+     */
+    public function set($fileId, $name, $value) {
+        // no-op for now
+        return [];
+    }
+}
+