Merge pull request #8062 from nupplaphil/Make-Storage

Make Storage testable & add tests

database.sql

@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2020.03-dev (Dalmatian Bellflower)
--- DB_UPDATE_VERSION 1329
+-- DB_UPDATE_VERSION 1330
 -- ------------------------------------------
 
 

doc/AddonStorageBackend.md

@@ -17,22 +17,24 @@ namespace Friendica\Model\Storage;
 ```php
 interface IStorage
 {
-	public static function get($ref);
+	public function get(string $reference);
-	public static function put($data, $ref = "");
+	public function put(string $data, string $reference = '');
-	public static function delete($ref);
+	public function delete(string $reference);
-	public static function getOptions();
+	public function getOptions();
-	public static function saveOptions($data);
+	public function saveOptions(array $data);
+	public function __toString();
+	public static function getName();
 }
 ```
 
-- `get($ref)` returns data pointed by `$ref`
+- `get(string $reference)` returns data pointed by `$reference`
-- `put($data, $ref)` saves data in `$data` to position `$ref`, or a new position if `$ref` is empty.
+- `put(string $data, string $reference)` saves data in `$data` to position `$reference`, or a new position if `$reference` is empty.
-- `delete($ref)` delete data pointed by `$ref`
+- `delete(string $reference)` delete data pointed by `$reference`
 
 Each storage backend can have options the admin can set in admin page.
 
 - `getOptions()` returns an array with details about each option to build the interface.
-- `saveOptions($data)` get `$data` from admin page, validate it and save it.
+- `saveOptions(array $data)` get `$data` from admin page, validate it and save it.
 
 The array returned by `getOptions()` is defined as:
 
@@ -84,11 +86,38 @@ See doxygen documentation of `IStorage` interface for details about each method.
 
 Each backend must be registered in the system when the plugin is installed, to be aviable.
 
-`Friendica\Core\StorageManager::register($name, $class)` is used to register the backend class.
+`DI::facStorage()->register(string $class)` is used to register the backend class.
-The `$name` must be univocal and will be shown to admin.
 
 When the plugin is uninstalled, registered backends must be unregistered using
-`Friendica\Core\StorageManager::unregister($class)`.
+`DI::facStorage()->unregister(string $class)`.
+
+You have to register a new hook in your addon, listening on `storage_instance(App $a, array $data)`.
+In case `$data['name']` is your storage class name, you have to instance a new instance of your `Friendica\Model\Storage\IStorage` class.
+Set the instance of your class as `$data['storage']` to pass it back to the backend.
+
+This is necessary because it isn't always clear, if you need further construction arguments.
+
+## Adding tests
+
+**Currently testing is limited to core Friendica only, this shows theoretically how tests should work in the future**
+
+Each new Storage class should be added to the test-environment at [Storage Tests](https://github.com/friendica/friendica/tree/develop/tests/src/Model/Storage/).
+
+Add a new test class which's naming convention is `StorageClassTest`, which extend the `StorageTest` in the same directory.
+
+Override the two necessary instances:
+```php
+use Friendica\Model\Storage\IStorage;
+
+abstract class StorageTest 
+{
+	// returns an instance of your newly created storage class
+	abstract protected function getInstance();
+
+	// Assertion for the option array you return for your new StorageClass
+	abstract protected function assertOption(IStorage $storage);
+} 
+```
 
 ## Example
 
@@ -112,60 +141,91 @@ use Friendica\Core\L10n;
 
 class SampleStorageBackend implements IStorage
 {
-	public static function get($ref)
+	const NAME = 'Sample Storage';
+
+	/** @var Config\IConfiguration */
+	private $config;
+	/** @var L10n\L10n */
+	private $l10n;
+
+	/**
+	  * SampleStorageBackend constructor.
+	  * @param Config\IConfiguration $config The configuration of Friendica
+	  *									  
+	  * You can add here every dynamic class as dependency you like and add them to a private field
+	  * Friendica automatically creates these classes and passes them as argument to the constructor									   
+	  */
+	public function __construct(Config\IConfiguration $config, L10n\L10n $l10n) 
 	{
-		// we return alwais the same image data. Which file we load is defined by
+		$this->config = $config;
+		$this->l10n   = $l10n;
+	}
+
+	public function get(string $reference)
+	{
+		// we return always the same image data. Which file we load is defined by
 		// a config key
-		$filename = Config::get("storage", "samplestorage", "sample.jpg");
+		$filename = $this->config->get('storage', 'samplestorage', 'sample.jpg');
 		return file_get_contents($filename);
 	}
 	
-	public static function put($data, $ref = "")
+	public function put(string $data, string $reference = '')
 	{
-		if ($ref === "") {
+		if ($reference === '') {
-			$ref = "sample";
+			$reference = 'sample';
 		}
 		// we don't save $data !
-		return $ref;
+		return $reference;
 	}
 	
-	public static function delete($ref)
+	public function delete(string $reference)
 	{
 		// we pretend to delete the data
 		return true;
 	}
 	
-	public static function getOptions()
+	public function getOptions()
 	{
-		$filename = Config::get("storage", "samplestorage", "sample.jpg");
+		$filename = $this->config->get('storage', 'samplestorage', 'sample.jpg');
 		return [
-			"filename" => [
+			'filename' => [
-				"input",	// will use a simple text input
+				'input',	// will use a simple text input
-				L10n::t("The file to return"),	// the label
+				$this->l10n->t('The file to return'),	// the label
 				$filename,	// the current value
-				L10n::t("Enter the path to a file"), // the help text
+				$this->l10n->t('Enter the path to a file'), // the help text
-				// no extra data for "input" type..
+				// no extra data for 'input' type..
+			],
 		];
 	}
 	
-	public static function saveOptions($data)
+	public function saveOptions(array $data)
 	{
 		// the keys in $data are the same keys we defined in getOptions()
-		$newfilename = trim($data["filename"]);
+		$newfilename = trim($data['filename']);
 		
 		// this function should always validate the data.
 		// in this example we check if file exists
 		if (!file_exists($newfilename)) {
 			// in case of error we return an array with
-			// ["optionname" => "error message"]
+			// ['optionname' => 'error message']
-			return ["filename" => "The file doesn't exists"];
+			return ['filename' => 'The file doesn\'t exists'];
 		}
 		
-		Config::set("storage", "samplestorage", $newfilename);
+		$this->config->set('storage', 'samplestorage', $newfilename);
 		
 		// no errors, return empty array
 		return [];
 	}
+
+	public function __toString()
+	{
+		return self::NAME;
+	}
+
+	public static function getName()
+	{
+		return self::NAME;
+	}
 }
 ```
 
@@ -182,23 +242,59 @@ The file is `addon/samplestorage/samplestorage.php`
  * Author: Alice <https://alice.social/~alice>
  */
 
-use Friendica\Core\StorageManager;
 use Friendica\Addon\samplestorage\SampleStorageBackend;
+use Friendica\DI;
 
 function samplestorage_install()
 {
 	// on addon install, we register our class with name "Sample Storage".
 	// note: we use `::class` property, which returns full class name as string
 	// this save us the problem of correctly escape backslashes in class name
-	StorageManager::register("Sample Storage", SampleStorageBackend::class);
+	DI::storageManager()->register(SampleStorageBackend::class);
 }
 
 function samplestorage_unistall()
 {
 	// when the plugin is uninstalled, we unregister the backend.
-	StorageManager::unregister("Sample Storage");
+	DI::storageManager()->unregister(SampleStorageBackend::class);
+}
+
+function samplestorage_storage_instance(\Friendica\App $a, array $data)
+{
+    if ($data['name'] === SampleStorageBackend::getName()) {
+    // instance a new sample storage instance and pass it back to the core for usage
+        $data['storage'] = new SampleStorageBackend(DI::config(), DI::l10n(), DI::cache());
+    }
 }
 ```
 
+**Theoretically - until tests for Addons are enabled too - create a test class with the name `addon/tests/SampleStorageTest.php`:
 
+```php
+use Friendica\Model\Storage\IStorage;
+use Friendica\Test\src\Model\Storage\StorageTest;
 
+class SampleStorageTest extends StorageTest 
+{
+	// returns an instance of your newly created storage class
+	protected function getInstance()
+	{
+		// create a new SampleStorageBackend instance with all it's dependencies
+		// Have a look at DatabaseStorageTest or FilesystemStorageTest for further insights
+		return new SampleStorageBackend();
+	}
+
+	// Assertion for the option array you return for your new StorageClass
+	protected function assertOption(IStorage $storage)
+	{
+		$this->assertEquals([
+			'filename' => [
+				'input',
+				'The file to return',
+				'sample.jpg',
+				'Enter the path to a file'
+			],
+		], $storage->getOptions());
+	}
+} 
+```

doc/Addons.md

@@ -706,6 +706,14 @@ Here is a complete list of all hook callbacks with file locations (as of 24-Sep-
     Hook::callAll('page_header', DI::page()['nav']);
     Hook::callAll('nav_info', $nav);
 
+### src/Core/Authentication.php
+
+    Hook::callAll('logged_in', $a->user);
+    
+### src/Core/StorageManager
+
+    Hook::callAll('storage_instance', $data);
+
 ### src/Worker/Directory.php
 
     Hook::callAll('globaldir_update', $arr);

doc/de/Addons.md

@@ -424,6 +424,10 @@ Eine komplette Liste aller Hook-Callbacks mit den zugehörigen Dateien (am 01-Ap
 ### src/Core/Authentication.php
 
     Hook::callAll('logged_in', $a->user);
+    
+### src/Core/StorageManager
+
+    Hook::callAll('storage_instance', $data);
 
 ### src/Worker/Directory.php
 

src/Console/Storage.php

@@ -13,6 +13,19 @@ class Storage extends \Asika\SimpleConsole\Console
 {
 	protected $helpOptions = ['h', 'help', '?'];
 
+	/** @var StorageManager */
+	private $storageManager;
+
+	/**
+	 * @param StorageManager $storageManager
+	 */
+	public function __construct(StorageManager $storageManager, array $argv = [])
+	{
+		parent::__construct($argv);
+
+		$this->storageManager = $storageManager;
+	}
+
 	protected function getHelp()
 	{
 		$help = <<<HELP
@@ -69,11 +82,11 @@ HELP;
 	protected function doList()
 	{
 		$rowfmt = ' %-3s | %-20s';
-		$current = StorageManager::getBackend();
+		$current = $this->storageManager->getBackend();
 		$this->out(sprintf($rowfmt, 'Sel', 'Name'));
 		$this->out('-----------------------');
 		$isregisterd = false;
-		foreach (StorageManager::listBackends() as $name => $class) {
+		foreach ($this->storageManager->listBackends() as $name => $class) {
 			$issel = ' ';
 			if ($current === $class) {
 				$issel = '*';
@@ -100,14 +113,14 @@ HELP;
 		}
 
 		$name = $this->args[1];
-		$class = StorageManager::getByName($name);
+		$class = $this->storageManager->getByName($name);
 
 		if ($class === '') {
 			$this->out($name . ' is not a registered backend.');
 			return -1;
 		}
 
-		if (!StorageManager::setBackend($class)) {
+		if (!$this->storageManager->setBackend($class)) {
 			$this->out($class . ' is not a valid backend storage class.');
 			return -1;
 		}
@@ -130,11 +143,11 @@ HELP;
 			$tables = [$table];
 		}
 
-		$current = StorageManager::getBackend();
+		$current = $this->storageManager->getBackend();
 		$total = 0;
 
 		do {
-			$moved = StorageManager::move($current, $tables, $this->getOption('n', 5000));
+			$moved = $this->storageManager->move($current, $tables, $this->getOption('n', 5000));
 			if ($moved) {
 				$this->out(date('[Y-m-d H:i:s] ') . sprintf('Moved %d files', $moved));
 			}

src/Core/StorageManager.php

@@ -2,8 +2,12 @@
 
 namespace Friendica\Core;
 
-use Friendica\Database\DBA;
+use Exception;
-use Friendica\Model\Storage\IStorage;
+use Friendica\Core\Config\IConfiguration;
+use Friendica\Core\L10n\L10n;
+use Friendica\Database\Database;
+use Friendica\Model\Storage;
+use Psr\Log\LoggerInterface;
 
 
 /**
@@ -14,59 +18,146 @@ use Friendica\Model\Storage\IStorage;
  */
 class StorageManager
 {
-	private static $default_backends = [
+	// Default tables to look for data
-		'Filesystem' => \Friendica\Model\Storage\Filesystem::class,
+	const TABLES = ['photo', 'attach'];
-		'Database' => \Friendica\Model\Storage\Database::class,
+
+	// Default storage backends
+	const DEFAULT_BACKENDS = [
+		Storage\Filesystem::NAME => Storage\Filesystem::class,
+		Storage\Database::NAME   => Storage\Database::class,
 	];
 
-	private static $backends = [];
+	private $backends = [];
 
-	private static function setup()
+	/**
+	 * @var Storage\IStorage[] A local cache for storage instances
+	 */
+	private $backendInstances = [];
+
+	/** @var Database */
+	private $dba;
+	/** @var IConfiguration */
+	private $config;
+	/** @var LoggerInterface */
+	private $logger;
+	/** @var L10n */
+	private $l10n;
+
+	/** @var Storage\IStorage */
+	private $currentBackend;
+
+	/**
+	 * @param Database        $dba
+	 * @param IConfiguration  $config
+	 * @param LoggerInterface $logger
+	 * @param L10n            $l10n
+	 */
+	public function __construct(Database $dba, IConfiguration $config, LoggerInterface $logger, L10n $l10n)
 	{
-		if (count(self::$backends) == 0) {
+		$this->dba      = $dba;
-			self::$backends = Config::get('storage', 'backends', self::$default_backends);
+		$this->config   = $config;
-		}
+		$this->logger   = $logger;
+		$this->l10n     = $l10n;
+		$this->backends = $config->get('storage', 'backends', self::DEFAULT_BACKENDS);
+
+		$currentName = $this->config->get('storage', 'name', '');
+
+		$this->currentBackend = $this->getByName($currentName);
 	}
 
 	/**
 	 * @brief Return current storage backend class
 	 *
-	 * @return string
+	 * @return Storage\IStorage|null
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	public static function getBackend()
+	public function getBackend()
 	{
-		return Config::get('storage', 'class', '');
+		return $this->currentBackend;
 	}
 
 	/**
 	 * @brief Return storage backend class by registered name
 	 *
-	 * @param string  $name  Backend name
+	 * @param string|null $name        Backend name
-	 * @return string Empty if no backend registered at $name exists
+	 * @param boolean     $userBackend Just return instances in case it's a user backend (e.g. not SystemResource)
+	 *
+	 * @return Storage\IStorage|null null if no backend registered at $name
+	 *
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	public static function getByName($name)
+	public function getByName(string $name = null, $userBackend = true)
 	{
-		self::setup();
+		// If there's no cached instance create a new instance
-		return self::$backends[$name] ?? '';
+		if (!isset($this->backendInstances[$name])) {
+			// If the current name isn't a valid backend (or the SystemResource instance) create it
+			if ($this->isValidBackend($name, $userBackend)) {
+				switch ($name) {
+					// Try the filesystem backend
+					case Storage\Filesystem::getName():
+						$this->backendInstances[$name] = new Storage\Filesystem($this->config, $this->logger, $this->l10n);
+						break;
+					// try the database backend
+					case Storage\Database::getName():
+						$this->backendInstances[$name] = new Storage\Database($this->dba, $this->logger, $this->l10n);
+						break;
+					// at least, try if there's an addon for the backend
+					case Storage\SystemResource::getName():
+						$this->backendInstances[$name] =  new Storage\SystemResource();
+						break;
+					default:
+						$data = [
+							'name' => $name,
+							'storage' => null,
+						];
+						Hook::callAll('storage_instance', $data);
+						if (($data['storage'] ?? null) instanceof Storage\IStorage) {
+							$this->backendInstances[$data['name'] ?? $name] = $data['storage'];
+						} else {
+							return null;
+						}
+						break;
+				}
+			} else {
+				return null;
+			}
+		}
+
+		return $this->backendInstances[$name];
+	}
+
+	/**
+	 * Checks, if the storage is a valid backend
+	 *
+	 * @param string|null $name        The name or class of the backend
+	 * @param boolean     $userBackend True, if just user backend should get returned (e.g. not SystemResource)
+	 *
+	 * @return boolean True, if the backend is a valid backend
+	 */
+	public function isValidBackend(string $name = null, bool $userBackend = true)
+	{
+		return array_key_exists($name, $this->backends) ||
+		       (!$userBackend && $name === Storage\SystemResource::getName());
 	}
 
 	/**
 	 * @brief Set current storage backend class
 	 *
-	 * @param string $class Backend class name
+	 * @param string $name Backend class name
-	 * @return bool
+	 *
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 * @return boolean True, if the set was successful
 	 */
-	public static function setBackend($class)
+	public function setBackend(string $name = null)
 	{
-		if (!in_array('Friendica\Model\Storage\IStorage', class_implements($class))) {
+		if (!$this->isValidBackend($name)) {
 			return false;
 		}
 
-		Config::set('storage', 'class', $class);
+		if ($this->config->set('storage', 'name', $name)) {
-
+			$this->currentBackend = $this->getByName($name);
-		return true;
+			return true;
+		} else {
+			return false;
+		}
 	}
 
 	/**
@@ -74,42 +165,63 @@ class StorageManager
 	 *
 	 * @return array
 	 */
-	public static function listBackends()
+	public function listBackends()
 	{
-		self::setup();
+		return $this->backends;
-		return self::$backends;
 	}
 
-
 	/**
-	 * @brief Register a storage backend class
+	 * Register a storage backend class
+	 *
+	 * You have to register the hook "storage_instance" as well to make this class work!
 	 *
-	 * @param string $name  User readable backend name
 	 * @param string $class Backend class name
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 *
+	 * @return boolean True, if the registration was successful
 	 */
-	public static function register($name, $class)
+	public function register(string $class)
 	{
-		/// @todo Check that $class implements IStorage
+		if (is_subclass_of($class, Storage\IStorage::class)) {
-		self::setup();
+			/** @var Storage\IStorage $class */
-		self::$backends[$name] = $class;
-		Config::set('storage', 'backends', self::$backends);
-	}
 
+			$backends        = $this->backends;
+			$backends[$class::getName()] = $class;
+
+			if ($this->config->set('storage', 'backends', $backends)) {
+				$this->backends = $backends;
+				return true;
+			} else {
+				return false;
+			}
+		} else {
+			return false;
+		}
+	}
 
 	/**
 	 * @brief Unregister a storage backend class
 	 *
-	 * @param string $name User readable backend name
+	 * @param string $class Backend class name
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 *
+	 * @return boolean True, if unregistering was successful
 	 */
-	public static function unregister($name)
+	public function unregister(string $class)
 	{
-		self::setup();
+		if (is_subclass_of($class, Storage\IStorage::class)) {
-		unset(self::$backends[$name]);
+			/** @var Storage\IStorage $class */
-		Config::set('storage', 'backends', self::$backends);
-	}
 
+			unset($this->backends[$class::getName()]);
+
+			if ($this->currentBackend instanceof $class) {
+			    $this->config->set('storage', 'name', null);
+				$this->currentBackend = null;
+			}
+
+			return $this->config->set('storage', 'backends', $this->backends);
+		} else {
+			return false;
+		}
+	}
 
 	/**
 	 * @brief Move up to 5000 resources to storage $dest
@@ -117,64 +229,60 @@ class StorageManager
 	 * Copy existing data to destination storage and delete from source.
 	 * This method cannot move to legacy in-table `data` field.
 	 *
-	 * @param string     $destination Storage class name
+	 * @param Storage\IStorage $destination Destination storage class name
-	 * @param array|null $tables      Tables to look in for resources. Optional, defaults to ['photo', 'attach']
+	 * @param array            $tables      Tables to look in for resources. Optional, defaults to ['photo', 'attach']
-	 * @param int        $limit       Limit of the process batch size, defaults to 5000
+	 * @param int              $limit       Limit of the process batch size, defaults to 5000
+	 *
 	 * @return int Number of moved resources
-	 * @throws \Exception
+	 * @throws Storage\StorageException
+	 * @throws Exception
 	 */
-	public static function move($destination, $tables = null, $limit = 5000)
+	public function move(Storage\IStorage $destination, array $tables = self::TABLES, int $limit = 5000)
 	{
-		if (empty($destination)) {
+		if ($destination === null) {
-			throw new \Exception('Can\'t move to NULL storage backend');
+			throw new Storage\StorageException('Can\'t move to NULL storage backend');
-		}
-		
-		if (is_null($tables)) {
-			$tables = ['photo', 'attach'];
 		}
 
 		$moved = 0;
 		foreach ($tables as $table) {
 			// Get the rows where backend class is not the destination backend class
-			$resources = DBA::select(
+			$resources = $this->dba->select(
-				$table, 
+				$table,
 				['id', 'data', 'backend-class', 'backend-ref'],
-				['`backend-class` IS NULL or `backend-class` != ?', $destination],
+				['`backend-class` IS NULL or `backend-class` != ?', $destination::getName()],
 				['limit' => $limit]
 			);
 
-			while ($resource = DBA::fetch($resources)) {
+			while ($resource = $this->dba->fetch($resources)) {
-				$id = $resource['id'];
+				$id        = $resource['id'];
-				$data = $resource['data'];
+				$data      = $resource['data'];
-				/** @var IStorage $backendClass */
+				$source    = $this->getByName($resource['backend-class']);
-				$backendClass = $resource['backend-class'];
+				$sourceRef = $resource['backend-ref'];
-				$backendRef = $resource['backend-ref'];
+
-				if (!empty($backendClass)) {
+				if (!empty($source)) {
-					Logger::log("get data from old backend " . $backendClass . " : " . $backendRef);
+					$this->logger->info('Get data from old backend.', ['oldBackend' => $source, 'oldReference' => $sourceRef]);
-					$data = $backendClass::get($backendRef);
+					$data = $source->get($sourceRef);
 				}
 
-				Logger::log("save data to new backend " . $destination);
+				$this->logger->info('Save data to new backend.', ['newBackend' => $destination]);
-				/** @var IStorage $destination */
+				$destinationRef = $destination->put($data);
-				$ref = $destination::put($data);
+				$this->logger->info('Saved data.', ['newReference' => $destinationRef]);
-				Logger::log("saved data as " . $ref);
 
-				if ($ref !== '') {
+				if ($destinationRef !== '') {
-					Logger::log("update row");
+					$this->logger->info('update row');
-					if (DBA::update($table, ['backend-class' => $destination, 'backend-ref' => $ref, 'data' => ''], ['id' => $id])) {
+					if ($this->dba->update($table, ['backend-class' => $destination, 'backend-ref' => $destinationRef, 'data' => ''], ['id' => $id])) {
-						if (!empty($backendClass)) {
+						if (!empty($source)) {
-							Logger::log("delete data from old backend " . $backendClass . " : " . $backendRef);
+							$this->logger->info('Delete data from old backend.', ['oldBackend' => $source, 'oldReference' => $sourceRef]);
-							$backendClass::delete($backendRef);
+							$source->delete($sourceRef);
 						}
 						$moved++;
 					}
 				}
 			}
 
-			DBA::close($resources);
+			$this->dba->close($resources);
 		}
 
 		return $moved;
 	}
 }
-

src/DI.php

@@ -27,6 +27,7 @@ use Psr\Log\LoggerInterface;
  * @method static Core\L10n\L10n l10n()
  * @method static Core\Process process()
  * @method static Core\Session\ISession session()
+ * @method static Core\StorageManager storageManager()
  * @method static Database\Database dba()
  * @method static Factory\Mastodon\Account mstdnAccount()
  * @method static Factory\Mastodon\FollowRequest mstdnFollowRequest()
@@ -34,6 +35,7 @@ use Psr\Log\LoggerInterface;
  * @method static Model\User\Cookie cookie()
  * @method static Model\Notify notify()
  * @method static Repository\Introduction intro()
+ * @method static Model\Storage\IStorage storage()
  * @method static Protocol\Activity activity()
  * @method static Util\ACLFormatter aclFormatter()
  * @method static Util\DateTimeFormat dtFormat()
@@ -47,38 +49,40 @@ use Psr\Log\LoggerInterface;
 abstract class DI
 {
 	const CLASS_MAPPING = [
-		'app'          => App::class,
+		'app'                => App::class,
-		'auth'         => App\Authentication::class,
+		'auth'               => App\Authentication::class,
-		'args'         => App\Arguments::class,
+		'args'               => App\Arguments::class,
-		'baseUrl'      => App\BaseURL::class,
+		'baseUrl'            => App\BaseURL::class,
-		'mode'         => App\Mode::class,
+		'mode'               => App\Mode::class,
-		'module'       => App\Module::class,
+		'module'             => App\Module::class,
-		'page'         => App\Page::class,
+		'page'               => App\Page::class,
-		'router'       => App\Router::class,
+		'router'             => App\Router::class,
-		'contentItem'  => Content\Item::class,
+		'contentItem'        => Content\Item::class,
-		'bbCodeVideo'  => Content\Text\BBCode\Video::class,
+		'bbCodeVideo'        => Content\Text\BBCode\Video::class,
-		'cache'        => Core\Cache\ICache::class,
+		'cache'              => Core\Cache\ICache::class,
-		'config'       => Core\Config\IConfiguration::class,
+		'config'             => Core\Config\IConfiguration::class,
-		'pConfig'      => Core\Config\IPConfiguration::class,
+		'pConfig'            => Core\Config\IPConfiguration::class,
-		'l10n'         => Core\L10n\L10n::class,
+		'l10n'               => Core\L10n\L10n::class,
-		'lock'         => Core\Lock\ILock::class,
+		'lock'               => Core\Lock\ILock::class,
-		'process'      => Core\Process::class,
+		'process'            => Core\Process::class,
-		'session'      => Core\Session\ISession::class,
+		'session'            => Core\Session\ISession::class,
-		'dba'          => Database\Database::class,
+		'storageManager'     => Core\StorageManager::class,
-		'mstdnAccount' => Factory\Mastodon\Account::class,
+		'dba'                => Database\Database::class,
+		'mstdnAccount'       => Factory\Mastodon\Account::class,
 		'mstdnFollowRequest' => Factory\Mastodon\FollowRequest::class,
 		'mstdnRelationship'  => Factory\Mastodon\Relationship::class,
-		'cookie'       => Model\User\Cookie::class,
+		'cookie'             => Model\User\Cookie::class,
-		'notify'       => Model\Notify::class,
+		'notify'             => Model\Notify::class,
-		'intro'        => Repository\Introduction::class,
+		'storage'            => Model\Storage\IStorage::class,
-		'activity'     => Protocol\Activity::class,
+		'intro'              => Repository\Introduction::class,
-		'aclFormatter' => Util\ACLFormatter::class,
+		'activity'           => Protocol\Activity::class,
-		'dtFormat'     => Util\DateTimeFormat::class,
+		'aclFormatter'       => Util\ACLFormatter::class,
-		'fs'           => Util\FileSystem::class,
+		'dtFormat'           => Util\DateTimeFormat::class,
-		'workerLogger' => Util\Logger\WorkerLogger::class,
+		'fs'                 => Util\FileSystem::class,
-		'profiler'     => Util\Profiler::class,
+		'workerLogger'       => Util\Logger\WorkerLogger::class,
-		'logger'       => LoggerInterface::class,
+		'profiler'           => Util\Profiler::class,
-		'devLogger'    => '$devLogger',
+		'logger'             => LoggerInterface::class,
+		'devLogger'          => '$devLogger',
 	];
 
 	/** @var Dice */

src/Model/Attach.php

@@ -6,12 +6,10 @@
  */
 namespace Friendica\Model;
 
-use Friendica\Core\StorageManager;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\Database\DBStructure;
 use Friendica\DI;
-use Friendica\Model\Storage\IStorage;
 use Friendica\Object\Image;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Mimetype;
@@ -186,13 +184,8 @@ class Attach
 			$filesize = strlen($data);
 		}
 
-		/** @var IStorage $backend_class */
+		$backend_ref = DI::storage()->put($data);
-		$backend_class = StorageManager::getBackend();
+		$data = '';
-		$backend_ref = '';
-		if ($backend_class !== '') {
-			$backend_ref = $backend_class::put($data);
-			$data = '';
-		}
 
 		$hash = System::createGUID(64);
 		$created = DateTimeFormat::utcNow();
@@ -210,7 +203,7 @@ class Attach
 			'allow_gid' => $allow_gid,
 			'deny_cid' => $deny_cid,
 			'deny_gid' => $deny_gid,
-			'backend-class' => $backend_class,
+			'backend-class' => (string)DI::storage(),
 			'backend-ref' => $backend_ref
 		];
 
@@ -266,10 +259,9 @@ class Attach
 			$items = self::selectToArray(['backend-class','backend-ref'], $conditions);
 
 			foreach($items as $item) {
-				/** @var IStorage $backend_class */
+				$backend_class = DI::storageManager()->getByName($item['backend-class'] ?? '');
-				$backend_class = (string)$item['backend-class'];
 				if ($backend_class !== '') {
-					$fields['backend-ref'] = $backend_class::put($img->asString(), $item['backend-ref']);
+					$fields['backend-ref'] = $backend_class->put($img->asString(), $item['backend-ref'] ?? '');
 				} else {
 					$fields['data'] = $img->asString();
 				}
@@ -299,10 +291,9 @@ class Attach
 		$items = self::selectToArray(['backend-class','backend-ref'], $conditions);
 
 		foreach($items as $item) {
-			/** @var IStorage $backend_class */
+			$backend_class = DI::storageManager()->getByName($item['backend-class'] ?? '');
-			$backend_class = (string)$item['backend-class'];
+			if ($backend_class !== null) {
-			if ($backend_class !== '') {
+				$backend_class->delete($item['backend-ref'] ?? '');
-				$backend_class::delete($item['backend-ref']);
 			}
 		}
 

src/Model/Photo.php

@@ -10,12 +10,11 @@ use Friendica\Core\Cache;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\Logger;
-use Friendica\Core\StorageManager;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\Database\DBStructure;
 use Friendica\DI;
-use Friendica\Model\Storage\IStorage;
+use Friendica\Model\Storage\SystemResource;
 use Friendica\Object\Image;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Images;
@@ -172,26 +171,24 @@ class Photo
 	 */
 	public static function getImageForPhoto(array $photo)
 	{
-		$data = "";
+		if (empty($photo['backend-class'])) {
-
-		if ($photo["backend-class"] == "") {
 			// legacy data storage in "data" column
-			$i = self::selectFirst(["data"], ["id" => $photo["id"]]);
+			$i = self::selectFirst(['data'], ['id' => $photo['id']]);
 			if ($i === false) {
 				return null;
 			}
-			$data = $i["data"];
+			$data = $i['data'];
 		} else {
-			$backendClass = $photo["backend-class"];
+			$backendClass = DI::storageManager()->getByName($photo['backend-class'] ?? '');
-			$backendRef = $photo["backend-ref"];
+			$backendRef = $photo['backend-ref'] ?? '';
-			$data = $backendClass::get($backendRef);
+			$data = $backendClass->get($backendRef);
 		}
 
-		if ($data === "") {
+		if (empty($data)) {
 			return null;
 		}
 
-		return new Image($data, $photo["type"]);
+		return new Image($data, $photo['type']);
 	}
 
 	/**
@@ -222,11 +219,11 @@ class Photo
 		$fields = self::getFields();
 		$values = array_fill(0, count($fields), "");
 
-		$photo = array_combine($fields, $values);
+		$photo                  = array_combine($fields, $values);
-		$photo["backend-class"] = Storage\SystemResource::class;
+		$photo['backend-class'] = SystemResource::NAME;
-		$photo["backend-ref"] = $filename;
+		$photo['backend-ref']   = $filename;
-		$photo["type"] = $mimetype;
+		$photo['type']          = $mimetype;
-		$photo["cacheable"] = false;
+		$photo['cacheable']     = false;
 
 		return $photo;
 	}
@@ -273,18 +270,17 @@ class Photo
 		$data = "";
 		$backend_ref = "";
 
-		/** @var IStorage $backend_class */
 		if (DBA::isResult($existing_photo)) {
 			$backend_ref = (string)$existing_photo["backend-ref"];
-			$backend_class = (string)$existing_photo["backend-class"];
+			$storage = DI::storageManager()->getByName($existing_photo["backend-class"] ?? '');
 		} else {
-			$backend_class = StorageManager::getBackend();
+			$storage = DI::storage();
 		}
 
-		if ($backend_class === "") {
+		if ($storage === null) {
 			$data = $Image->asString();
 		} else {
-			$backend_ref = $backend_class::put($Image->asString(), $backend_ref);
+			$backend_ref = $storage->put($Image->asString(), $backend_ref);
 		}
 
 
@@ -309,7 +305,7 @@ class Photo
 			"deny_cid" => $deny_cid,
 			"deny_gid" => $deny_gid,
 			"desc" => $desc,
-			"backend-class" => $backend_class,
+			"backend-class" => (string)$storage,
 			"backend-ref" => $backend_ref
 		];
 
@@ -340,10 +336,9 @@ class Photo
 		$photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 
 		foreach($photos as $photo) {
-			/** @var IStorage $backend_class */
+			$backend_class = DI::storageManager()->getByName($photo['backend-class'] ?? '');
-			$backend_class = (string)$photo["backend-class"];
+			if ($backend_class !== null) {
-			if ($backend_class !== "") {
+				$backend_class->delete($photo["backend-ref"] ?? '');
-				$backend_class::delete($photo["backend-ref"]);
 			}
 		}
 
@@ -370,10 +365,9 @@ class Photo
 			$photos = self::selectToArray(['backend-class', 'backend-ref'], $conditions);
 
 			foreach($photos as $photo) {
-				/** @var IStorage $backend_class */
+				$backend_class = DI::storageManager()->getByName($photo['backend-class'] ?? '');
-				$backend_class = (string)$photo["backend-class"];
+				if ($backend_class !== null) {
-				if ($backend_class !== "") {
+					$fields["backend-ref"] = $backend_class->put($img->asString(), $photo['backend-ref']);
-					$fields["backend-ref"] = $backend_class::put($img->asString(), $photo["backend-ref"]);
 				} else {
 					$fields["data"] = $img->asString();
 				}

src/Model/Storage/AbstractStorage.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Friendica\Model\Storage;
+
+use Friendica\Core\L10n\L10n;
+use Psr\Log\LoggerInterface;
+
+/**
+ * A general storage class which loads common dependencies and implements common methods
+ */
+abstract class AbstractStorage implements IStorage
+{
+	/** @var L10n */
+	protected $l10n;
+	/** @var LoggerInterface */
+	protected $logger;
+
+	/**
+	 * @param L10n            $l10n
+	 * @param LoggerInterface $logger
+	 */
+	public function __construct(L10n $l10n, LoggerInterface $logger)
+	{
+		$this->l10n   = $l10n;
+		$this->logger = $logger;
+	}
+
+	public function __toString()
+	{
+		return static::getName();
+	}
+}

src/Model/Storage/Database.php

@@ -6,58 +6,100 @@
 
 namespace Friendica\Model\Storage;
 
-use Friendica\Core\Logger;
+use Friendica\Core\L10n\L10n;
-use Friendica\Core\L10n;
+use Psr\Log\LoggerInterface;
-use Friendica\Database\DBA;
+use Friendica\Database\Database as DBA;
 
 /**
  * @brief Database based storage system
  *
  * This class manage data stored in database table.
  */
-class Database implements IStorage
+class Database extends AbstractStorage
 {
-	public static function get($ref)
+	const NAME = 'Database';
+
+	/** @var DBA */
+	private $dba;
+
+	/**
+	 * @param DBA             $dba
+	 * @param LoggerInterface $logger
+	 * @param L10n            $l10n
+	 */
+	public function __construct(DBA $dba, LoggerInterface $logger, L10n $l10n)
 	{
-		$r = DBA::selectFirst('storage', ['data'], ['id' => $ref]);
+		parent::__construct($l10n, $logger);
-		if (!DBA::isResult($r)) {
+
+		$this->dba = $dba;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function get(string $reference)
+	{
+		$result = $this->dba->selectFirst('storage', ['data'], ['id' => $reference]);
+		if (!$this->dba->isResult($result)) {
 			return '';
 		}
 
-		return $r['data'];
+		return $result['data'];
 	}
 
-	public static function put($data, $ref = '')
+	/**
+	 * @inheritDoc
+	 */
+	public function put(string $data, string $reference = '')
 	{
-		if ($ref !== '') {
+		if ($reference !== '') {
-			$r = DBA::update('storage', ['data' => $data], ['id' => $ref]);
+			$result = $this->dba->update('storage', ['data' => $data], ['id' => $reference]);
-			if ($r === false) {
+			if ($result === false) {
-				Logger::log('Failed to update data with id ' . $ref . ': ' . DBA::errorNo() . ' : ' . DBA::errorMessage());
+				$this->logger->warning('Failed to update data.', ['id' => $reference, 'errorCode' => $this->dba->errorNo(), 'errorMessage' => $this->dba->errorMessage()]);
-				throw new StorageException(L10n::t('Database storage failed to update %s', $ref));
+				throw new StorageException($this->l10n->t('Database storage failed to update %s', $reference));
- 			}
-			return $ref;
-		} else {
-			$r = DBA::insert('storage', ['data' => $data]);
-			if ($r === false) {
-				Logger::log('Failed to insert data: ' . DBA::errorNo() . ' : ' . DBA::errorMessage());
-				throw new StorageException(L10n::t('Database storage failed to insert data'));
 			}
-			return DBA::lastInsertId();
+
+			return $reference;
+		} else {
+			$result = $this->dba->insert('storage', ['data' => $data]);
+			if ($result === false) {
+				$this->logger->warning('Failed to insert data.', ['errorCode' => $this->dba->errorNo(), 'errorMessage' => $this->dba->errorMessage()]);
+				throw new StorageException($this->l10n->t('Database storage failed to insert data'));
+			}
+
+			return $this->dba->lastInsertId();
 		}
 	}
 
-	public static function delete($ref)
+	/**
+	 * @inheritDoc
+	 */
+	public function delete(string $reference)
 	{
-		return DBA::delete('storage', ['id' => $ref]);
+		return $this->dba->delete('storage', ['id' => $reference]);
 	}
 
-	public static function getOptions()
+	/**
+	 * @inheritDoc
+	 */
+	public function getOptions()
 	{
 		return [];
 	}
 
-	public static function saveOptions($data)
+	/**
+	 * @inheritDoc
+	 */
+	public function saveOptions(array $data)
 	{
 		return [];
 	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public static function getName()
+	{
+		return self::NAME;
+	}
 }

src/Model/Storage/Filesystem.php

@@ -6,10 +6,10 @@
 
 namespace Friendica\Model\Storage;
 
-use Friendica\Core\Config;
+use Friendica\Core\Config\IConfiguration;
-use Friendica\Core\L10n;
+use Friendica\Core\L10n\L10n;
-use Friendica\Core\Logger;
 use Friendica\Util\Strings;
+use Psr\Log\LoggerInterface;
 
 /**
  * @brief Filesystem based storage backend
@@ -21,52 +21,72 @@ use Friendica\Util\Strings;
  * Each new resource gets a value as reference and is saved in a
  * folder tree stucture created from that value.
  */
-class Filesystem implements IStorage
+class Filesystem extends AbstractStorage
 {
+	const NAME = 'Filesystem';
+
 	// Default base folder
 	const DEFAULT_BASE_FOLDER = 'storage';
 
-	private static function getBasePath()
+	/** @var IConfiguration */
+	private $config;
+
+	/** @var string */
+	private $basePath;
+
+	/**
+	 * Filesystem constructor.
+	 *
+	 * @param IConfiguration  $config
+	 * @param LoggerInterface $logger
+	 * @param L10n            $l10n
+	 */
+	public function __construct(IConfiguration $config, LoggerInterface $logger, L10n $l10n)
 	{
-		$path = Config::get('storage', 'filesystem_path', self::DEFAULT_BASE_FOLDER);
+		parent::__construct($l10n, $logger);
-		return rtrim($path, '/');
+
+		$this->config = $config;
+
+		$path           = $this->config->get('storage', 'filesystem_path', self::DEFAULT_BASE_FOLDER);
+		$this->basePath = rtrim($path, '/');
 	}
 
 	/**
 	 * @brief Split data ref and return file path
-	 * @param string  $ref  Data reference
+	 *
+	 * @param string $reference Data reference
+	 *
 	 * @return string
 	 */
-	private static function pathForRef($ref)
+	private function pathForRef(string $reference)
 	{
-		$base = self::getBasePath();
+		$fold1 = substr($reference, 0, 2);
-		$fold1 = substr($ref, 0, 2);
+		$fold2 = substr($reference, 2, 2);
-		$fold2 = substr($ref, 2, 2);
+		$file  = substr($reference, 4);
-		$file = substr($ref, 4);
 
-		return implode('/', [$base, $fold1, $fold2, $file]);
+		return implode('/', [$this->basePath, $fold1, $fold2, $file]);
 	}
 
 
 	/**
 	 * @brief Create dirctory tree to store file, with .htaccess and index.html files
+	 *
 	 * @param string $file Path and filename
+	 *
 	 * @throws StorageException
 	 */
-	private static function createFoldersForFile($file)
+	private function createFoldersForFile(string $file)
 	{
 		$path = dirname($file);
 
 		if (!is_dir($path)) {
 			if (!mkdir($path, 0770, true)) {
-				Logger::log('Failed to create dirs ' . $path);
+				$this->logger->warning('Failed to create dir.', ['path' => $path]);
-				throw new StorageException(L10n::t('Filesystem storage failed to create "%s". Check you write permissions.', $path));
+				throw new StorageException($this->l10n->t('Filesystem storage failed to create "%s". Check you write permissions.', $path));
 			}
 		}
 
-		$base = self::getBasePath();
+		while ($path !== $this->basePath) {
-
-		while ($path !== $base) {
 			if (!is_file($path . '/index.html')) {
 				file_put_contents($path . '/index.html', '');
 			}
@@ -80,9 +100,12 @@ class Filesystem implements IStorage
 		}
 	}
 
-	public static function get($ref)
+	/**
+	 * @inheritDoc
+	 */
+	public function get(string $reference)
 	{
-		$file = self::pathForRef($ref);
+		$file = $this->pathForRef($reference);
 		if (!is_file($file)) {
 			return '';
 		}
@@ -90,27 +113,33 @@ class Filesystem implements IStorage
 		return file_get_contents($file);
 	}
 
-	public static function put($data, $ref = '')
+	/**
+	 * @inheritDoc
+	 */
+	public function put(string $data, string $reference = '')
 	{
-		if ($ref === '') {
+		if ($reference === '') {
-			$ref = Strings::getRandomHex();
+			$reference = Strings::getRandomHex();
 		}
-		$file = self::pathForRef($ref);
+		$file = $this->pathForRef($reference);
 
-		self::createFoldersForFile($file);
+		$this->createFoldersForFile($file);
 
-		$r = file_put_contents($file, $data);
+		if (!file_put_contents($file, $data)) {
-		if ($r === FALSE) {
+			$this->logger->warning('Failed to write data.', ['file' => $file]);
-			Logger::log('Failed to write data to ' . $file);
+			throw new StorageException($this->l10n->t('Filesystem storage failed to save data to "%s". Check your write permissions', $file));
-			throw new StorageException(L10n::t('Filesystem storage failed to save data to "%s". Check your write permissions', $file));
 		}
+
 		chmod($file, 0660);
-		return $ref;
+		return $reference;
 	}
 
-	public static function delete($ref)
+	/**
+	 * @inheritDoc
+	 */
+	public function delete(string $reference)
 	{
-		$file = self::pathForRef($ref);
+		$file = $this->pathForRef($reference);
 		// return true if file doesn't exists. we want to delete it: success with zero work!
 		if (!is_file($file)) {
 			return true;
@@ -118,28 +147,42 @@ class Filesystem implements IStorage
 		return unlink($file);
 	}
 
-	public static function getOptions()
+	/**
+	 * @inheritDoc
+	 */
+	public function getOptions()
 	{
 		return [
 			'storagepath' => [
 				'input',
-				L10n::t('Storage base path'),
+				$this->l10n->t('Storage base path'),
-				self::getBasePath(),
+				$this->basePath,
-				L10n::t('Folder where uploaded files are saved. For maximum security, This should be a path outside web server folder tree')
+				$this->l10n->t('Folder where uploaded files are saved. For maximum security, This should be a path outside web server folder tree')
 			]
 		];
 	}
-	
+
-	public static function saveOptions($data)
+	/**
+	 * @inheritDoc
+	 */
+	public function saveOptions(array $data)
 	{
-		$storagepath = $data['storagepath'] ?? '';
+		$storagePath = $data['storagepath'] ?? '';
-		if ($storagepath === '' || !is_dir($storagepath)) {
+		if ($storagePath === '' || !is_dir($storagePath)) {
 			return [
-				'storagepath' => L10n::t('Enter a valid existing folder')
+				'storagepath' => $this->l10n->t('Enter a valid existing folder')
 			];
 		};
-		Config::set('storage', 'filesystem_path', $storagepath);
+		$this->config->set('storage', 'filesystem_path', $storagePath);
+		$this->basePath = $storagePath;
 		return [];
 	}
 
+	/**
+	 * @inheritDoc
+	 */
+	public static function getName()
+	{
+		return self::NAME;
+	}
 }

src/Model/Storage/IStorage.php

@@ -13,26 +13,32 @@ interface IStorage
 {
 	/**
 	 * @brief Get data from backend
-	 * @param string  $ref  Data reference
+	 *
+	 * @param string $reference Data reference
+	 *
 	 * @return string
-     */
+	 */
-	public static function get($ref);
+	public function get(string $reference);
 
 	/**
 	 * @brief Put data in backend as $ref. If $ref is not defined a new reference is created.
-	 * @param string  $data  Data to save
+	 *
-	 * @param string  $ref   Data referece. Optional.
+	 * @param string $data      Data to save
-	 * @return string Saved data referece
+	 * @param string $reference Data reference. Optional.
+	 *
+	 * @return string Saved data reference
 	 */
-	public static function put($data, $ref = "");
+	public function put(string $data, string $reference = "");
 
 	/**
 	 * @brief Remove data from backend
-	 * @param string  $ref  Data referece
+	 *
+	 * @param string $reference Data reference
+	 *
 	 * @return boolean  True on success
 	 */
-	public static function delete($ref);
+	public function delete(string $reference);
-	
+
 	/**
 	 * @brief Get info about storage options
 	 *
@@ -71,19 +77,30 @@ interface IStorage
 	 *
 	 * See https://github.com/friendica/friendica/wiki/Quick-Template-Guide
 	 */
-	public static function getOptions();
+	public function getOptions();
-	
+
 	/**
 	 * @brief Validate and save options
 	 *
-	 * @param array  $data  Array [optionname => value] to be saved
+	 * @param array $data Array [optionname => value] to be saved
 	 *
 	 * @return array  Validation errors: [optionname => error message]
 	 *
 	 * Return array must be empty if no error.
 	 */
-	public static function saveOptions($data);
+	public function saveOptions(array $data);
-	
+
+	/**
+	 * The name of the backend
+	 *
+	 * @return string
+	 */
+	public function __toString();
+
+	/**
+	 * The name of the backend
+	 *
+	 * @return string
+	 */
+	public static function getName();
 }
-
-

src/Model/Storage/SystemResource.php

@@ -16,10 +16,15 @@ use \BadMethodCallException;
  */
 class SystemResource implements IStorage
 {
+	const NAME = 'SystemResource';
+
 	// Valid folders to look for resources
 	const VALID_FOLDERS = ["images"];
 
-	public static function get($filename)
+	/**
+	 * @inheritDoc
+	 */
+	public function get(string $filename)
 	{
 		$folder = dirname($filename);
 		if (!in_array($folder, self::VALID_FOLDERS)) {
@@ -31,25 +36,48 @@ class SystemResource implements IStorage
 		return file_get_contents($filename);
 	}
 
-
+	/**
-	public static function put($data, $filename = "")
+	 * @inheritDoc
+	 */
+	public function put(string $data, string $filename = '')
 	{
 		throw new BadMethodCallException();
 	}
 
-	public static function delete($filename)
+	public function delete(string $filename)
 	{
 		throw new BadMethodCallException();
 	}
 
-	public static function getOptions()
+	/**
+	 * @inheritDoc
+	 */
+	public function getOptions()
 	{
 		return [];
 	}
 
-	public static function saveOptions($data)
+	/**
+	 * @inheritDoc
+	 */
+	public function saveOptions(array $data)
 	{
 		return [];
 	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function __toString()
+	{
+		return self::NAME;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public static function getName()
+	{
+		return self::NAME;
+	}
 }
-

src/Module/Admin/Site.php

@@ -199,42 +199,37 @@ class Site extends BaseAdminModule
 		$relay_user_tags   = !empty($_POST['relay_user_tags']);
 		$active_panel      = (!empty($_POST['active_panel'])      ? "#" . Strings::escapeTags(trim($_POST['active_panel'])) : '');
 
-		/**
-		 * @var $storagebackend \Friendica\Model\Storage\IStorage
-		 */
 		$storagebackend    = Strings::escapeTags(trim($_POST['storagebackend'] ?? ''));
 
 		// save storage backend form
-		if (!is_null($storagebackend) && $storagebackend != "") {
+		if (DI::storageManager()->setBackend($storagebackend)) {
-			if (StorageManager::setBackend($storagebackend)) {
+			$storage_opts     = DI::storage()->getOptions();
-				$storage_opts = $storagebackend::getOptions();
+			$storage_form_prefix = preg_replace('|[^a-zA-Z0-9]|', '', $storagebackend);
-				$storage_form_prefix = preg_replace('|[^a-zA-Z0-9]|', '', $storagebackend);
+			$storage_opts_data   = [];
-				$storage_opts_data = [];
+			foreach ($storage_opts as $name => $info) {
-				foreach ($storage_opts as $name => $info) {
+				$fieldname = $storage_form_prefix . '_' . $name;
-					$fieldname = $storage_form_prefix . '_' . $name;
+				switch ($info[0]) { // type
-					switch ($info[0]) { // type
+					case 'checkbox':
-						case 'checkbox':
+					case 'yesno':
-						case 'yesno':
+						$value = !empty($_POST[$fieldname]);
-							$value = !empty($_POST[$fieldname]);
+						break;
-							break;
+					default:
-						default:
+						$value = $_POST[$fieldname] ?? '';
-							$value = $_POST[$fieldname] ?? '';
-					}
-					$storage_opts_data[$name] = $value;
 				}
-				unset($name);
+				$storage_opts_data[$name] = $value;
-				unset($info);
-
-				$storage_form_errors = $storagebackend::saveOptions($storage_opts_data);
-				if (count($storage_form_errors)) {
-					foreach ($storage_form_errors as $name => $err) {
-						notice('Storage backend, ' . $storage_opts[$name][1] . ': ' . $err);
-					}
-					DI::baseUrl()->redirect('admin/site' . $active_panel);
-				}
-			} else {
-				info(L10n::t('Invalid storage backend setting value.'));
 			}
+			unset($name);
+			unset($info);
+
+			$storage_form_errors = DI::storage()->saveOptions($storage_opts_data);
+			if (count($storage_form_errors)) {
+				foreach ($storage_form_errors as $name => $err) {
+					notice('Storage backend, ' . $storage_opts[$name][1] . ': ' . $err);
+				}
+				DI::baseUrl()->redirect('admin/site' . $active_panel);
+			}
+		} else {
+			info(L10n::t('Invalid storage backend setting value.'));
 		}
 
 		// Has the directory url changed? If yes, then resubmit the existing profiles there
@@ -530,29 +525,25 @@ class Site extends BaseAdminModule
 			$optimize_max_tablesize = -1;
 		}
 
-		$storage_backends = StorageManager::listBackends();
+		$current_storage_backend = DI::storage();
-		/** @var $current_storage_backend \Friendica\Model\Storage\IStorage */
-		$current_storage_backend = StorageManager::getBackend();
-
 		$available_storage_backends = [];
 
 		// show legacy option only if it is the current backend:
 		// once changed can't be selected anymore
-		if ($current_storage_backend == '') {
+		if ($current_storage_backend == null) {
 			$available_storage_backends[''] = L10n::t('Database (legacy)');
 		}
 
-		foreach ($storage_backends as $name => $class) {
+		foreach (DI::storageManager()->listBackends() as $name => $class) {
-			$available_storage_backends[$class] = $name;
+			$available_storage_backends[$name] = $name;
 		}
-		unset($storage_backends);
 
 		// build storage config form,
 		$storage_form_prefix = preg_replace('|[^a-zA-Z0-9]|' ,'', $current_storage_backend);
 
 		$storage_form = [];
 		if (!is_null($current_storage_backend) && $current_storage_backend != '') {
-			foreach ($current_storage_backend::getOptions() as $name => $info) {
+			foreach ($current_storage_backend->getOptions() as $name => $info) {
 				$type = $info[0];
 				$info[0] = $storage_form_prefix . '_' . $name;
 				$info['type'] = $type;

src/Worker/CronJobs.php

@@ -324,8 +324,8 @@ class CronJobs
 	 */
 	private static function moveStorage()
 	{
-		$current = StorageManager::getBackend();
+		$current = DI::storage();
-		$moved = StorageManager::move($current);
+		$moved = DI::storageManager()->move($current);
 
 		if ($moved) {
 			Worker::add(PRIORITY_LOW, "CronJobs", "move_storage");

static/dbstructure.config.php

@@ -34,7 +34,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1329);
+	define('DB_UPDATE_VERSION', 1330);
 }
 
 return [

static/dependencies.config.php

@@ -8,8 +8,10 @@ use Friendica\Core\L10n\L10n;
 use Friendica\Core\Lock\ILock;
 use Friendica\Core\Process;
 use Friendica\Core\Session\ISession;
+use Friendica\Core\StorageManager;
 use Friendica\Database\Database;
 use Friendica\Factory;
+use Friendica\Model\Storage\IStorage;
 use Friendica\Model\User\Cookie;
 use Friendica\Util;
 use Psr\Log\LoggerInterface;
@@ -193,5 +195,11 @@ return [
 		'constructParams' => [
 			$_SERVER, $_COOKIE
 		],
-	]
+	],
+	IStorage::class => [
+		'instanceOf' => StorageManager::class,
+		'call' => [
+			['getBackend', [], Dice::CHAIN_CALL],
+		],
+	],
 ];

tests/Util/SampleStorageBackend.php

@@ -0,0 +1,106 @@
+<?php
+
+namespace Friendica\Test\Util;
+
+use Friendica\App;
+use Friendica\Core\Hook;
+use Friendica\Model\Storage\IStorage;
+
+use Friendica\Core\L10n\L10n;
+use Mockery\MockInterface;
+
+/**
+ * A backend storage example class
+ */
+class SampleStorageBackend implements IStorage
+{
+	const NAME = 'Sample Storage';
+
+	/** @var L10n */
+	private $l10n;
+
+	/** @var array */
+	private $options = [
+		'filename' => [
+			'input',    // will use a simple text input
+			'The file to return',    // the label
+			'sample',    // the current value
+			'Enter the path to a file', // the help text
+			// no extra data for 'input' type..
+		],
+	];
+	/** @var array Just save the data in memory */
+	private $data = [];
+
+	/**
+	 * SampleStorageBackend constructor.
+	 *
+	 * @param L10n $l10n The configuration of Friendica
+	 *
+	 * You can add here every dynamic class as dependency you like and add them to a private field
+	 * Friendica automatically creates these classes and passes them as argument to the constructor
+	 */
+	public function __construct(L10n $l10n)
+	{
+		$this->l10n = $l10n;
+	}
+
+	public function get(string $reference)
+	{
+		// we return always the same image data. Which file we load is defined by
+		// a config key
+		return $this->data[$reference] ?? null;
+	}
+
+	public function put(string $data, string $reference = '')
+	{
+		if ($reference === '') {
+			$reference = 'sample';
+		}
+
+		$this->data[$reference] = $data;
+
+		return $reference;
+	}
+
+	public function delete(string $reference)
+	{
+		if (isset($this->data[$reference])) {
+			unset($this->data[$reference]);
+		}
+
+		return true;
+	}
+
+	public function getOptions()
+	{
+		return $this->options;
+	}
+
+	public function saveOptions(array $data)
+	{
+		$this->options = $data;
+
+		// no errors, return empty array
+		return $this->options;
+	}
+
+	public function __toString()
+	{
+		return self::NAME;
+	}
+
+	public static function getName()
+	{
+		return self::NAME;
+	}
+
+	/**
+	 * This one is a hack to register this class to the hook
+	 */
+	public static function registerHook()
+	{
+		Hook::register('storage_instance', __DIR__ . '/SampleStorageBackendInstance.php', 'create_instance');
+	}
+}
+

tests/Util/SampleStorageBackendInstance.php

@@ -0,0 +1,18 @@
+<?php
+
+// contains a test-hook call for creating a storage instance
+
+use Friendica\App;
+use Friendica\Core\L10n\L10n;
+use Friendica\Test\Util\SampleStorageBackend;
+use Mockery\MockInterface;
+
+function create_instance(App $a, &$data)
+{
+	/** @var L10n|MockInterface $l10n */
+	$l10n = \Mockery::mock(L10n::class);
+
+	if ($data['name'] == SampleStorageBackend::getName()) {
+		$data['storage'] = new SampleStorageBackend($l10n);
+	}
+}

tests/datasets/storage/database.fixture.php

@@ -0,0 +1,40 @@
+<?php
+
+return [
+	'photo'   => [
+		// move from data-attribute to storage backend
+		[
+			'id'            => 1,
+			'backend-class' => null,
+			'backend-ref'   => 'f0c0d0i2',
+			'data'          => 'without class',
+		],
+		// move from storage-backend to maybe filesystem backend, skip at database backend
+		[
+			'id'            => 2,
+			'backend-class' => 'Database',
+			'backend-ref'   => 1,
+			'data'          => '',
+		],
+		// move data if invalid storage
+		[
+			'id'            => 3,
+			'backend-class' => 'invalid!',
+			'backend-ref'   => 'unimported',
+			'data'          => 'invalid data moved',
+		],
+		// skip everytime because of invalid storage and no data
+		[
+			'id'            => 3,
+			'backend-class' => 'invalid!',
+			'backend-ref'   => 'unimported',
+			'data'          => '',
+		],
+	],
+	'storage' => [
+		[
+			'id'   => 1,
+			'data' => 'inside database',
+		],
+	],
+];

tests/src/Core/StorageManagerTest.php

@@ -0,0 +1,264 @@
+<?php
+
+namespace Friendica\Test\src\Core;
+
+use Dice\Dice;
+use Friendica\Core\Config\IConfiguration;
+use Friendica\Core\Config\PreloadConfiguration;
+use Friendica\Core\Hook;
+use Friendica\Core\L10n\L10n;
+use Friendica\Core\Session\ISession;
+use Friendica\Core\StorageManager;
+use Friendica\Database\Database;
+use Friendica\DI;
+use Friendica\Factory\ConfigFactory;
+use Friendica\Model\Config\Config;
+use Friendica\Model\Storage;
+use Friendica\Core\Session;
+use Friendica\Test\DatabaseTest;
+use Friendica\Test\Util\Database\StaticDatabase;
+use Friendica\Test\Util\VFSTrait;
+use Friendica\Util\ConfigFileLoader;
+use Friendica\Util\Profiler;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+use Friendica\Test\Util\SampleStorageBackend;
+
+class StorageManagerTest extends DatabaseTest
+{
+	/** @var Database */
+	private $dba;
+	/** @var IConfiguration */
+	private $config;
+	/** @var LoggerInterface */
+	private $logger;
+	/** @var L10n */
+	private $l10n;
+
+	use VFSTrait;
+
+	public function setUp()
+	{
+		parent::setUp();
+
+		$this->setUpVfsDir();
+
+		$this->logger = new NullLogger();
+
+		$profiler = \Mockery::mock(Profiler::class);
+		$profiler->shouldReceive('saveTimestamp')->withAnyArgs()->andReturn(true);
+
+		// load real config to avoid mocking every config-entry which is related to the Database class
+		$configFactory = new ConfigFactory();
+		$loader        = new ConfigFileLoader($this->root->url());
+		$configCache   = $configFactory->createCache($loader);
+
+		$this->dba = new StaticDatabase($configCache, $profiler, $this->logger);
+
+		$configModel  = new Config($this->dba);
+		$this->config = new PreloadConfiguration($configCache, $configModel);
+
+		$this->l10n = \Mockery::mock(L10n::class);
+	}
+
+	/**
+	 * Test plain instancing first
+	 */
+	public function testInstance()
+	{
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+
+		$this->assertInstanceOf(StorageManager::class, $storageManager);
+	}
+
+	public function dataStorages()
+	{
+		return [
+			'empty'          => [
+				'name'        => '',
+				'assert'      => null,
+				'assertName'  => '',
+				'userBackend' => false,
+			],
+			'database'       => [
+				'name'        => Storage\Database::NAME,
+				'assert'      => Storage\Database::class,
+				'assertName'  => Storage\Database::NAME,
+				'userBackend' => true,
+			],
+			'filesystem'     => [
+				'name'        => Storage\Filesystem::NAME,
+				'assert'      => Storage\Filesystem::class,
+				'assertName'  => Storage\Filesystem::NAME,
+				'userBackend' => true,
+			],
+			'systemresource' => [
+				'name'        => Storage\SystemResource::NAME,
+				'assert'      => Storage\SystemResource::class,
+				'assertName'  => Storage\SystemResource::NAME,
+				// false here, because SystemResource isn't meant to be a user backend,
+				// it's for system resources only
+				'userBackend' => false,
+			],
+			'invalid'        => [
+				'name'        => 'invalid',
+				'assert'      => null,
+				'assertName'  => '',
+				'userBackend' => false,
+			],
+		];
+	}
+
+	/**
+	 * Test the getByName() method
+	 *
+	 * @dataProvider dataStorages
+	 */
+	public function testGetByName($name, $assert, $assertName, $userBackend)
+	{
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+
+		$storage = $storageManager->getByName($name, $userBackend);
+
+		if (!empty($assert)) {
+			$this->assertInstanceOf(Storage\IStorage::class, $storage);
+			$this->assertInstanceOf($assert, $storage);
+			$this->assertEquals($name, $storage::getName());
+		} else {
+			$this->assertNull($storage);
+		}
+		$this->assertEquals($assertName, $storage);
+	}
+
+	/**
+	 * Test the isValidBackend() method
+	 *
+	 * @dataProvider dataStorages
+	 */
+	public function testIsValidBackend($name, $assert, $assertName, $userBackend)
+	{
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+
+		$this->assertEquals($userBackend, $storageManager->isValidBackend($name));
+	}
+
+	/**
+	 * Test the method listBackends() with default setting
+	 */
+	public function testListBackends()
+	{
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+
+		$this->assertEquals(StorageManager::DEFAULT_BACKENDS, $storageManager->listBackends());
+	}
+
+	/**
+	 * Test the method getBackend()
+	 *
+	 * @dataProvider dataStorages
+	 */
+	public function testGetBackend($name, $assert, $assertName, $userBackend)
+	{
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+
+		$this->assertNull($storageManager->getBackend());
+
+		if ($userBackend) {
+			$storageManager->setBackend($name);
+
+			$this->assertInstanceOf($assert, $storageManager->getBackend());
+		}
+	}
+
+	/**
+	 * Test the method getBackend() with a pre-configured backend
+	 *
+	 * @dataProvider dataStorages
+	 */
+	public function testPresetBackend($name, $assert, $assertName, $userBackend)
+	{
+		$this->config->set('storage', 'name', $name);
+
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+
+		if ($userBackend) {
+			$this->assertInstanceOf($assert, $storageManager->getBackend());
+		} else {
+			$this->assertNull($storageManager->getBackend());
+		}
+	}
+
+	/**
+	 * Tests the register and unregister methods for a new backend storage class
+	 *
+	 * Uses a sample storage for testing
+	 *
+	 * @see SampleStorageBackend
+	 */
+	public function testRegisterUnregisterBackends()
+	{
+		/// @todo Remove dice once "Hook" is dynamic and mockable
+		$dice   = (new Dice())
+			->addRules(include __DIR__ . '/../../../static/dependencies.config.php')
+			->addRule(Database::class, ['instanceOf' => StaticDatabase::class, 'shared' => true])
+			->addRule(ISession::class, ['instanceOf' => Session\Memory::class, 'shared' => true, 'call' => null]);
+		DI::init($dice);
+
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+
+		$this->assertTrue($storageManager->register(SampleStorageBackend::class));
+
+		$this->assertEquals(array_merge(StorageManager::DEFAULT_BACKENDS, [
+			SampleStorageBackend::getName() => SampleStorageBackend::class,
+		]), $storageManager->listBackends());
+		$this->assertEquals(array_merge(StorageManager::DEFAULT_BACKENDS, [
+			SampleStorageBackend::getName() => SampleStorageBackend::class,
+		]), $this->config->get('storage', 'backends'));
+
+		// inline call to register own class as hook (testing purpose only)
+		SampleStorageBackend::registerHook();
+		Hook::loadHooks();
+
+		$this->assertTrue($storageManager->setBackend(SampleStorageBackend::NAME));
+		$this->assertEquals(SampleStorageBackend::NAME, $this->config->get('storage', 'name'));
+
+		$this->assertInstanceOf(SampleStorageBackend::class, $storageManager->getBackend());
+
+		$this->assertTrue($storageManager->unregister(SampleStorageBackend::class));
+		$this->assertEquals(StorageManager::DEFAULT_BACKENDS, $this->config->get('storage', 'backends'));
+		$this->assertEquals(StorageManager::DEFAULT_BACKENDS, $storageManager->listBackends());
+
+		$this->assertNull($storageManager->getBackend());
+		$this->assertNull($this->config->get('storage', 'name'));
+	}
+
+	/**
+	 * Test moving data to a new storage (currently testing db & filesystem)
+	 *
+	 * @dataProvider dataStorages
+	 */
+	public function testMoveStorage($name, $assert, $assertName, $userBackend)
+	{
+		if (!$userBackend) {
+			return;
+		}
+
+		$this->loadFixture(__DIR__ . '/../../datasets/storage/database.fixture.php', $this->dba);
+
+		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
+		$storage = $storageManager->getByName($name);
+		$storageManager->move($storage);
+
+		$photos = $this->dba->select('photo', ['backend-ref', 'backend-class', 'id', 'data']);
+
+		while ($photo = $this->dba->fetch($photos)) {
+
+			$this->assertEmpty($photo['data']);
+
+			$storage = $storageManager->getByName($photo['backend-class']);
+			$data = $storage->get($photo['backend-ref']);
+
+			$this->assertNotEmpty($data);
+		}
+	}
+}

tests/src/Model/Storage/DatabaseStorageTest.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Friendica\Test\src\Model\Storage;
+
+use Friendica\Core\L10n\L10n;
+use Friendica\Factory\ConfigFactory;
+use Friendica\Model\Storage\Database;
+use Friendica\Model\Storage\IStorage;
+use Friendica\Test\DatabaseTestTrait;
+use Friendica\Test\Util\Database\StaticDatabase;
+use Friendica\Test\Util\VFSTrait;
+use Friendica\Util\ConfigFileLoader;
+use Friendica\Util\Profiler;
+use Mockery\MockInterface;
+use Psr\Log\NullLogger;
+
+class DatabaseStorageTest extends StorageTest
+{
+	use DatabaseTestTrait;
+	use VFSTrait;
+
+	protected function setUp()
+	{
+		$this->setUpVfsDir();
+
+		parent::setUp();
+	}
+
+	protected function getInstance()
+	{
+		$logger = new NullLogger();
+		$profiler = \Mockery::mock(Profiler::class);
+		$profiler->shouldReceive('saveTimestamp')->withAnyArgs()->andReturn(true);
+
+		// load real config to avoid mocking every config-entry which is related to the Database class
+		$configFactory = new ConfigFactory();
+		$loader = new ConfigFileLoader($this->root->url());
+		$configCache = $configFactory->createCache($loader);
+
+		$dba = new StaticDatabase($configCache, $profiler, $logger);
+
+		/** @var MockInterface|L10n $l10n */
+		$l10n = \Mockery::mock(L10n::class)->makePartial();
+
+		return new Database($dba, $logger, $l10n);
+	}
+
+	protected function assertOption(IStorage $storage)
+	{
+		$this->assertEmpty($storage->getOptions());
+	}
+}

tests/src/Model/Storage/FilesystemStorageTest.php

@@ -0,0 +1,111 @@
+<?php
+
+namespace Friendica\Test\src\Model\Storage;
+
+use Friendica\Core\Config\IConfiguration;
+use Friendica\Core\L10n\L10n;
+use Friendica\Model\Storage\Filesystem;
+use Friendica\Model\Storage\IStorage;
+use Friendica\Test\Util\VFSTrait;
+use Friendica\Util\Profiler;
+use Mockery\MockInterface;
+use org\bovigo\vfs\vfsStream;
+use Psr\Log\NullLogger;
+use function GuzzleHttp\Psr7\uri_for;
+
+class FilesystemStorageTest extends StorageTest
+{
+	use VFSTrait;
+
+	/** @var MockInterface|IConfiguration */
+	protected $config;
+
+	protected function setUp()
+	{
+		$this->setUpVfsDir();
+
+		vfsStream::create(['storage' => []], $this->root);
+
+		parent::setUp();
+	}
+
+	protected function getInstance()
+	{
+		$logger = new NullLogger();
+		$profiler = \Mockery::mock(Profiler::class);
+		$profiler->shouldReceive('saveTimestamp')->withAnyArgs()->andReturn(true);
+
+		/** @var MockInterface|L10n $l10n */
+		$l10n = \Mockery::mock(L10n::class)->makePartial();
+		$this->config = \Mockery::mock(IConfiguration::class);
+		$this->config->shouldReceive('get')
+		             ->with('storage', 'filesystem_path', Filesystem::DEFAULT_BASE_FOLDER)
+		             ->andReturn($this->root->getChild('storage')->url());
+
+		return new Filesystem($this->config, $logger, $l10n);
+	}
+
+	protected function assertOption(IStorage $storage)
+	{
+		$this->assertEquals([
+			'storagepath' => [
+				'input', 'Storage base path',
+				$this->root->getChild('storage')->url(),
+				'Folder where uploaded files are saved. For maximum security, This should be a path outside web server folder tree'
+			]
+		], $storage->getOptions());
+	}
+
+	/**
+	 * Test the exception in case of missing directorsy permissions
+	 *
+	 * @expectedException  \Friendica\Model\Storage\StorageException
+	 * @expectedExceptionMessageRegExp /Filesystem storage failed to create \".*\". Check you write permissions./
+	 */
+	public function testMissingDirPermissions()
+	{
+		$this->root->getChild('storage')->chmod(000);
+
+		$instance = $this->getInstance();
+		$instance->put('test');
+	}
+
+	/**
+	 * Test the exception in case of missing file permissions
+	 *
+	 * @expectedException \Friendica\Model\Storage\StorageException
+	 * @expectedExceptionMessageRegExp /Filesystem storage failed to save data to \".*\". Check your write permissions/
+	 */
+	public function testMissingFilePermissions()
+	{
+		$this->markTestIncomplete("Cannot catch file_put_content() error due vfsStream failure");
+
+		vfsStream::create(['storage' => ['f0' => ['c0' => ['k0i0' => '']]]], $this->root);
+
+		$this->root->getChild('storage/f0/c0/k0i0')->chmod(000);
+
+		$instance = $this->getInstance();
+		$instance->put('test', 'f0c0k0i0');
+	}
+
+	/**
+	 * Test the backend storage of the Filesystem Storage class
+	 */
+	public function testDirectoryTree()
+	{
+		$instance = $this->getInstance();
+
+		$instance->put('test', 'f0c0d0i0');
+
+		$dir = $this->root->getChild('storage/f0/c0')->url();
+		$file = $this->root->getChild('storage/f0/c0/d0i0')->url();
+
+		$this->assertDirectoryExists($dir);
+		$this->assertFileExists($file);
+
+		$this->assertDirectoryIsWritable($dir);
+		$this->assertFileIsWritable($file);
+
+		$this->assertEquals('test', file_get_contents($file));
+	}
+}

tests/src/Model/Storage/StorageTest.php

@@ -0,0 +1,96 @@
+<?php
+
+namespace Friendica\Test\src\Model\Storage;
+
+use Friendica\Model\Storage\IStorage;
+use Friendica\Test\MockedTest;
+
+abstract class StorageTest extends MockedTest
+{
+	/** @return IStorage */
+	abstract protected function getInstance();
+
+	abstract protected function assertOption(IStorage $storage);
+
+	/**
+	 * Test if the instance is "really" implementing the interface
+	 */
+	public function testInstance()
+	{
+		$instance = $this->getInstance();
+		$this->assertInstanceOf(IStorage::class, $instance);
+	}
+
+	/**
+	 * Test if the "getOption" is asserted
+	 */
+	public function testGetOptions()
+	{
+		$instance = $this->getInstance();
+
+		$this->assertOption($instance);
+	}
+
+	/**
+	 * Test basic put, get and delete operations
+	 */
+	public function testPutGetDelete()
+	{
+		$instance = $this->getInstance();
+
+		$ref = $instance->put('data12345');
+		$this->assertNotEmpty($ref);
+
+		$this->assertEquals('data12345', $instance->get($ref));
+
+		$this->assertTrue($instance->delete($ref));
+	}
+
+	/**
+	 * Test a delete with an invalid reference
+	 */
+	public function testInvalidDelete()
+	{
+		$instance = $this->getInstance();
+
+		// Even deleting not existing references should return "true"
+		$this->assertTrue($instance->delete(-1234456));
+	}
+
+	/**
+	 * Test a get with an invalid reference
+	 */
+	public function testInvalidGet()
+	{
+		$instance = $this->getInstance();
+
+		// Invalid references return an empty string
+		$this->assertEmpty($instance->get(-123456));
+	}
+
+	/**
+	 * Test an update with a given reference
+	 */
+	public function testUpdateReference()
+	{
+		$instance = $this->getInstance();
+
+		$ref = $instance->put('data12345');
+		$this->assertNotEmpty($ref);
+
+		$this->assertEquals('data12345', $instance->get($ref));
+
+		$this->assertEquals($ref, $instance->put('data5432', $ref));
+		$this->assertEquals('data5432', $instance->get($ref));
+	}
+
+	/**
+	 * Test that an invalid update results in an insert
+	 */
+	public function testInvalidUpdate()
+	{
+		$instance = $this->getInstance();
+
+		$this->assertEquals(-123, $instance->put('data12345', -123));
+	}
+}

update.php

@@ -12,6 +12,7 @@ use Friendica\Model\Contact;
 use Friendica\Model\GContact;
 use Friendica\Model\Item;
 use Friendica\Model\User;
+use Friendica\Model\Storage;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Worker\Delivery;
 
@@ -408,3 +409,26 @@ function update_1327()
 	return Update::SUCCESS;
 }
 
+function update_1330()
+{
+	$currStorage = Config::get('storage', 'class', '');
+
+	// set the name of the storage instead of the classpath as config
+	if (!empty($currStorage)) {
+		/** @var Storage\IStorage $currStorage */
+		if (!Config::set('storage', 'name', $currStorage::getName())) {
+			return Update::FAILED;
+		}
+
+		// try to delete the class since it isn't needed. This won't work with config files
+		Config::delete('storage', 'class');
+	}
+
+	// Update attachments and photos
+	if (!DBA::p("UPDATE `photo` SET `photo`.`backend-class` = SUBSTR(`photo`.`backend-class`, 22) WHERE `photo`.`backend-class` LIKE 'Friendica\\Model\\Storage\\%'") ||
+	    !DBA::p("UPDATE `attach` SET `attach`.`backend-class` = SUBSTR(`attach`.`backend-class`, 22) WHERE `attach`.`backend-class` LIKE 'Friendica\\Model\\Storage\\%'")) {
+		return Update::FAILED;
+	};
+
+	return Update::SUCCESS;
+}