nextcloud / server

apps/files/lib/Activity/Provider.php

Indentation +462 added lines, -462 removed lines

@@ -41,466 +41,466 @@
 
 class Provider implements IProvider {
 
-	/** @var IFactory */
-	protected $languageFactory;
-
-	/** @var IL10N */
-	protected $l;
-	/** @var IL10N */
-	protected $activityLang;
-
-	/** @var IURLGenerator */
-	protected $url;
-
-	/** @var IManager */
-	protected $activityManager;
-
-	/** @var IUserManager */
-	protected $userManager;
-
-	/** @var IRootFolder */
-	protected $rootFolder;
-
-	/** @var IEventMerger */
-	protected $eventMerger;
-
-	/** @var string[] cached displayNames - key is the UID and value the displayname */
-	protected $displayNames = [];
-
-	protected $fileIsEncrypted = false;
-
-	/**
-	 * @param IFactory $languageFactory
-	 * @param IURLGenerator $url
-	 * @param IManager $activityManager
-	 * @param IUserManager $userManager
-	 * @param IRootFolder $rootFolder
-	 * @param IEventMerger $eventMerger
-	 */
-	public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager, IRootFolder $rootFolder, IEventMerger $eventMerger) {
-		$this->languageFactory = $languageFactory;
-		$this->url = $url;
-		$this->activityManager = $activityManager;
-		$this->userManager = $userManager;
-		$this->rootFolder = $rootFolder;
-		$this->eventMerger = $eventMerger;
-	}
-
-	/**
-	 * @param string $language
-	 * @param IEvent $event
-	 * @param IEvent|null $previousEvent
-	 * @return IEvent
-	 * @throws \InvalidArgumentException
-	 * @since 11.0.0
-	 */
-	public function parse($language, IEvent $event, IEvent $previousEvent = null) {
-		if ($event->getApp() !== 'files') {
-			throw new \InvalidArgumentException();
-		}
-
-		$this->l = $this->languageFactory->get('files', $language);
-		$this->activityLang = $this->languageFactory->get('activity', $language);
-
-		if ($this->activityManager->isFormattingFilteredObject()) {
-			try {
-				return $this->parseShortVersion($event, $previousEvent);
-			} catch (\InvalidArgumentException $e) {
-				// Ignore and simply use the long version...
-			}
-		}
-
-		return $this->parseLongVersion($event, $previousEvent);
-	}
-
-	protected function setIcon(IEvent $event, string $icon, string $app = 'files') {
-		if ($this->activityManager->getRequirePNG()) {
-			$event->setIcon($this->url->getAbsoluteURL($this->url->imagePath($app, $icon . '.png')));
-		} else {
-			$event->setIcon($this->url->getAbsoluteURL($this->url->imagePath($app, $icon . '.svg')));
-		}
-	}
-
-	/**
-	 * @param IEvent $event
-	 * @param IEvent|null $previousEvent
-	 * @return IEvent
-	 * @throws \InvalidArgumentException
-	 * @since 11.0.0
-	 */
-	public function parseShortVersion(IEvent $event, IEvent $previousEvent = null) {
-		$parsedParameters = $this->getParameters($event);
-
-		if ($event->getSubject() === 'created_by') {
-			$subject = $this->l->t('Created by {user}');
-			$this->setIcon($event, 'add-color');
-		} else if ($event->getSubject() === 'changed_by') {
-			$subject = $this->l->t('Changed by {user}');
-			$this->setIcon($event, 'change');
-		} else if ($event->getSubject() === 'deleted_by') {
-			$subject = $this->l->t('Deleted by {user}');
-			$this->setIcon($event, 'delete-color');
-		} else if ($event->getSubject() === 'restored_by') {
-			$subject = $this->l->t('Restored by {user}');
-			$this->setIcon($event, 'actions/history', 'core');
-		} else if ($event->getSubject() === 'renamed_by') {
-			$subject = $this->l->t('Renamed by {user}');
-			$this->setIcon($event, 'change');
-		} else if ($event->getSubject() === 'moved_by') {
-			$subject = $this->l->t('Moved by {user}');
-			$this->setIcon($event, 'change');
-		} else {
-			throw new \InvalidArgumentException();
-		}
-
-		if (!isset($parsedParameters['user'])) {
-			// External user via public link share
-			$subject = str_replace('{user}', $this->activityLang->t('"remote user"'), $subject);
-		}
-
-		$this->setSubjects($event, $subject, $parsedParameters);
-
-		return $this->eventMerger->mergeEvents('user', $event, $previousEvent);
-	}
-
-	/**
-	 * @param IEvent $event
-	 * @param IEvent|null $previousEvent
-	 * @return IEvent
-	 * @throws \InvalidArgumentException
-	 * @since 11.0.0
-	 */
-	public function parseLongVersion(IEvent $event, IEvent $previousEvent = null) {
-		$this->fileIsEncrypted = false;
-		$parsedParameters = $this->getParameters($event);
-
-		if ($event->getSubject() === 'created_self') {
-			$subject = $this->l->t('You created {file}');
-			if ($this->fileIsEncrypted) {
-				$subject = $this->l->t('You created an encrypted file in {file}');
-			}
-			$this->setIcon($event, 'add-color');
-		} else if ($event->getSubject() === 'created_by') {
-			$subject = $this->l->t('{user} created {file}');
-			if ($this->fileIsEncrypted) {
-				$subject = $this->l->t('{user} created an encrypted file in {file}');
-			}
-			$this->setIcon($event, 'add-color');
-		} else if ($event->getSubject() === 'created_public') {
-			$subject = $this->l->t('{file} was created in a public folder');
-			$this->setIcon($event, 'add-color');
-		} else if ($event->getSubject() === 'changed_self') {
-			$subject = $this->l->t('You changed {file}');
-			if ($this->fileIsEncrypted) {
-				$subject = $this->l->t('You changed an encrypted file in {file}');
-			}
-			$this->setIcon($event, 'change');
-		} else if ($event->getSubject() === 'changed_by') {
-			$subject = $this->l->t('{user} changed {file}');
-			if ($this->fileIsEncrypted) {
-				$subject = $this->l->t('{user} changed an encrypted file in {file}');
-			}
-			$this->setIcon($event, 'change');
-		} else if ($event->getSubject() === 'deleted_self') {
-			$subject = $this->l->t('You deleted {file}');
-			if ($this->fileIsEncrypted) {
-				$subject = $this->l->t('You deleted an encrypted file in {file}');
-			}
-			$this->setIcon($event, 'delete-color');
-		} else if ($event->getSubject() === 'deleted_by') {
-			$subject = $this->l->t('{user} deleted {file}');
-			if ($this->fileIsEncrypted) {
-				$subject = $this->l->t('{user} deleted an encrypted file in {file}');
-			}
-			$this->setIcon($event, 'delete-color');
-		} else if ($event->getSubject() === 'restored_self') {
-			$subject = $this->l->t('You restored {file}');
-			$this->setIcon($event, 'actions/history', 'core');
-		} else if ($event->getSubject() === 'restored_by') {
-			$subject = $this->l->t('{user} restored {file}');
-			$this->setIcon($event, 'actions/history', 'core');
-		} else if ($event->getSubject() === 'renamed_self') {
-			$subject = $this->l->t('You renamed {oldfile} to {newfile}');
-			$this->setIcon($event, 'change');
-		} else if ($event->getSubject() === 'renamed_by') {
-			$subject = $this->l->t('{user} renamed {oldfile} to {newfile}');
-			$this->setIcon($event, 'change');
-		} else if ($event->getSubject() === 'moved_self') {
-			$subject = $this->l->t('You moved {oldfile} to {newfile}');
-			$this->setIcon($event, 'change');
-		} else if ($event->getSubject() === 'moved_by') {
-			$subject = $this->l->t('{user} moved {oldfile} to {newfile}');
-			$this->setIcon($event, 'change');
-		} else {
-			throw new \InvalidArgumentException();
-		}
-
-		if ($this->fileIsEncrypted) {
-			$event->setSubject($event->getSubject() . '_enc', $event->getSubjectParameters());
-		}
-
-		if (!isset($parsedParameters['user'])) {
-			// External user via public link share
-			$subject = str_replace('{user}', $this->activityLang->t('"remote user"'), $subject);
-		}
-
-		$this->setSubjects($event, $subject, $parsedParameters);
-
-		if ($event->getSubject() === 'moved_self' || $event->getSubject() === 'moved_by') {
-			$event = $this->eventMerger->mergeEvents('oldfile', $event, $previousEvent);
-		} else {
-			$event = $this->eventMerger->mergeEvents('file', $event, $previousEvent);
-		}
-
-		if ($event->getChildEvent() === null) {
-			// Couldn't group by file, maybe we can group by user
-			$event = $this->eventMerger->mergeEvents('user', $event, $previousEvent);
-		}
-
-		return $event;
-	}
-
-	protected function setSubjects(IEvent $event, $subject, array $parameters) {
-		$placeholders = $replacements = [];
-		foreach ($parameters as $placeholder => $parameter) {
-			$placeholders[] = '{' . $placeholder . '}';
-			if ($parameter['type'] === 'file') {
-				$replacements[] = $parameter['path'];
-			} else {
-				$replacements[] = $parameter['name'];
-			}
-		}
-
-		$event->setParsedSubject(str_replace($placeholders, $replacements, $subject))
-			->setRichSubject($subject, $parameters);
-	}
-
-	/**
-	 * @param IEvent $event
-	 * @return array
-	 * @throws \InvalidArgumentException
-	 */
-	protected function getParameters(IEvent $event) {
-		$parameters = $event->getSubjectParameters();
-		switch ($event->getSubject()) {
-			case 'created_self':
-			case 'created_public':
-			case 'changed_self':
-			case 'deleted_self':
-			case 'restored_self':
-				return [
-					'file' => $this->getFile($parameters[0], $event),
-				];
-			case 'created_by':
-			case 'changed_by':
-			case 'deleted_by':
-			case 'restored_by':
-				if ($parameters[1] === '') {
-					// External user via public link share
-					return [
-						'file' => $this->getFile($parameters[0], $event),
-					];
-				}
-				return [
-					'file' => $this->getFile($parameters[0], $event),
-					'user' => $this->getUser($parameters[1]),
-				];
-			case 'renamed_self':
-			case 'moved_self':
-				return [
-					'newfile' => $this->getFile($parameters[0]),
-					'oldfile' => $this->getFile($parameters[1]),
-				];
-			case 'renamed_by':
-			case 'moved_by':
-				if ($parameters[1] === '') {
-					// External user via public link share
-					return [
-						'newfile' => $this->getFile($parameters[0]),
-						'oldfile' => $this->getFile($parameters[2]),
-					];
-				}
-				return [
-					'newfile' => $this->getFile($parameters[0]),
-					'user' => $this->getUser($parameters[1]),
-					'oldfile' => $this->getFile($parameters[2]),
-				];
-		}
-		return [];
-	}
-
-	/**
-	 * @param array|string $parameter
-	 * @param IEvent|null $event
-	 * @return array
-	 * @throws \InvalidArgumentException
-	 */
-	protected function getFile($parameter, IEvent $event = null) {
-		if (is_array($parameter)) {
-			$path = reset($parameter);
-			$id = (string) key($parameter);
-		} else if ($event !== null) {
-			// Legacy from before ownCloud 8.2
-			$path = $parameter;
-			$id = $event->getObjectId();
-		} else {
-			throw new \InvalidArgumentException('Could not generate file parameter');
-		}
-
-		$encryptionContainer = $this->getEndToEndEncryptionContainer($id, $path);
-		if ($encryptionContainer instanceof Folder) {
-			$this->fileIsEncrypted = true;
-			try {
-				$fullPath = rtrim($encryptionContainer->getPath(), '/');
-				// Remove /user/files/...
-				list(,,, $path) = explode('/', $fullPath, 4);
-				if (!$path) {
-					throw new InvalidPathException('Path could not be split correctly');
-				}
-
-				return [
-					'type' => 'file',
-					'id' => $encryptionContainer->getId(),
-					'name' => $encryptionContainer->getName(),
-					'path' => $path,
-					'link' => $this->url->linkToRouteAbsolute('files.viewcontroller.showFile', ['fileid' => $encryptionContainer->getId()]),
-				];
-			} catch (\Exception $e) {
-				// fall back to the normal one
-				$this->fileIsEncrypted = false;
-			}
-		}
-
-		return [
-			'type' => 'file',
-			'id' => $id,
-			'name' => basename($path),
-			'path' => trim($path, '/'),
-			'link' => $this->url->linkToRouteAbsolute('files.viewcontroller.showFile', ['fileid' => $id]),
-		];
-	}
-
-	protected $fileEncrypted = [];
-
-	/**
-	 * Check if a file is end2end encrypted
-	 * @param int $fileId
-	 * @param string $path
-	 * @return Folder|null
-	 */
-	protected function getEndToEndEncryptionContainer($fileId, $path) {
-		if (isset($this->fileEncrypted[$fileId])) {
-			return $this->fileEncrypted[$fileId];
-		}
-
-		$fileName = basename($path);
-		if (!preg_match('/^[0-9a-fA-F]{32}$/', $fileName)) {
-			$this->fileEncrypted[$fileId] = false;
-			return $this->fileEncrypted[$fileId];
-		}
-
-		$userFolder = $this->rootFolder->getUserFolder($this->activityManager->getCurrentUserId());
-		$files = $userFolder->getById($fileId);
-		if (empty($files)) {
-			try {
-				// Deleted, try with parent
-				$file = $this->findExistingParent($userFolder, dirname($path));
-			} catch (NotFoundException $e) {
-				return null;
-			}
-
-			if (!$file instanceof Folder || !$file->isEncrypted()) {
-				return null;
-			}
-
-			$this->fileEncrypted[$fileId] = $file;
-			return $file;
-		}
-
-		$file = array_shift($files);
-
-		if ($file instanceof Folder && $file->isEncrypted()) {
-			// If the folder is encrypted, it is the Container,
-			// but can be the name is just fine.
-			$this->fileEncrypted[$fileId] = true;
-			return null;
-		}
-
-		$this->fileEncrypted[$fileId] = $this->getParentEndToEndEncryptionContainer($userFolder, $file);
-		return $this->fileEncrypted[$fileId];
-	}
-
-	/**
-	 * @param Folder $userFolder
-	 * @param string $path
-	 * @return Folder
-	 * @throws NotFoundException
-	 */
-	protected function findExistingParent(Folder $userFolder, $path) {
-		if ($path === '/') {
-			throw new NotFoundException('Reached the root');
-		}
-
-		try {
-			$folder = $userFolder->get(dirname($path));
-		} catch (NotFoundException $e) {
-			return $this->findExistingParent($userFolder, dirname($path));
-		}
-
-		return $folder;
-	}
-
-	/**
-	 * Check all parents until the user's root folder if one is encrypted
-	 *
-	 * @param Folder $userFolder
-	 * @param Node $file
-	 * @return Node|null
-	 */
-	protected function getParentEndToEndEncryptionContainer(Folder $userFolder, Node $file) {
-		try {
-			$parent = $file->getParent();
-
-			if ($userFolder->getId() === $parent->getId()) {
-				return null;
-			}
-		} catch (\Exception $e) {
-			return null;
-		}
-
-		if ($parent->isEncrypted()) {
-			return $parent;
-		}
-
-		return $this->getParentEndToEndEncryptionContainer($userFolder, $parent);
-	}
-
-	/**
-	 * @param string $uid
-	 * @return array
-	 */
-	protected function getUser($uid) {
-		if (!isset($this->displayNames[$uid])) {
-			$this->displayNames[$uid] = $this->getDisplayName($uid);
-		}
-
-		return [
-			'type' => 'user',
-			'id' => $uid,
-			'name' => $this->displayNames[$uid],
-		];
-	}
-
-	/**
-	 * @param string $uid
-	 * @return string
-	 */
-	protected function getDisplayName($uid) {
-		$user = $this->userManager->get($uid);
-		if ($user instanceof IUser) {
-			return $user->getDisplayName();
-		} else {
-			return $uid;
-		}
-	}
+    /** @var IFactory */
+    protected $languageFactory;
+
+    /** @var IL10N */
+    protected $l;
+    /** @var IL10N */
+    protected $activityLang;
+
+    /** @var IURLGenerator */
+    protected $url;
+
+    /** @var IManager */
+    protected $activityManager;
+
+    /** @var IUserManager */
+    protected $userManager;
+
+    /** @var IRootFolder */
+    protected $rootFolder;
+
+    /** @var IEventMerger */
+    protected $eventMerger;
+
+    /** @var string[] cached displayNames - key is the UID and value the displayname */
+    protected $displayNames = [];
+
+    protected $fileIsEncrypted = false;
+
+    /**
+     * @param IFactory $languageFactory
+     * @param IURLGenerator $url
+     * @param IManager $activityManager
+     * @param IUserManager $userManager
+     * @param IRootFolder $rootFolder
+     * @param IEventMerger $eventMerger
+     */
+    public function __construct(IFactory $languageFactory, IURLGenerator $url, IManager $activityManager, IUserManager $userManager, IRootFolder $rootFolder, IEventMerger $eventMerger) {
+        $this->languageFactory = $languageFactory;
+        $this->url = $url;
+        $this->activityManager = $activityManager;
+        $this->userManager = $userManager;
+        $this->rootFolder = $rootFolder;
+        $this->eventMerger = $eventMerger;
+    }
+
+    /**
+     * @param string $language
+     * @param IEvent $event
+     * @param IEvent|null $previousEvent
+     * @return IEvent
+     * @throws \InvalidArgumentException
+     * @since 11.0.0
+     */
+    public function parse($language, IEvent $event, IEvent $previousEvent = null) {
+        if ($event->getApp() !== 'files') {
+            throw new \InvalidArgumentException();
+        }
+
+        $this->l = $this->languageFactory->get('files', $language);
+        $this->activityLang = $this->languageFactory->get('activity', $language);
+
+        if ($this->activityManager->isFormattingFilteredObject()) {
+            try {
+                return $this->parseShortVersion($event, $previousEvent);
+            } catch (\InvalidArgumentException $e) {
+                // Ignore and simply use the long version...
+            }
+        }
+
+        return $this->parseLongVersion($event, $previousEvent);
+    }
+
+    protected function setIcon(IEvent $event, string $icon, string $app = 'files') {
+        if ($this->activityManager->getRequirePNG()) {
+            $event->setIcon($this->url->getAbsoluteURL($this->url->imagePath($app, $icon . '.png')));
+        } else {
+            $event->setIcon($this->url->getAbsoluteURL($this->url->imagePath($app, $icon . '.svg')));
+        }
+    }
+
+    /**
+     * @param IEvent $event
+     * @param IEvent|null $previousEvent
+     * @return IEvent
+     * @throws \InvalidArgumentException
+     * @since 11.0.0
+     */
+    public function parseShortVersion(IEvent $event, IEvent $previousEvent = null) {
+        $parsedParameters = $this->getParameters($event);
+
+        if ($event->getSubject() === 'created_by') {
+            $subject = $this->l->t('Created by {user}');
+            $this->setIcon($event, 'add-color');
+        } else if ($event->getSubject() === 'changed_by') {
+            $subject = $this->l->t('Changed by {user}');
+            $this->setIcon($event, 'change');
+        } else if ($event->getSubject() === 'deleted_by') {
+            $subject = $this->l->t('Deleted by {user}');
+            $this->setIcon($event, 'delete-color');
+        } else if ($event->getSubject() === 'restored_by') {
+            $subject = $this->l->t('Restored by {user}');
+            $this->setIcon($event, 'actions/history', 'core');
+        } else if ($event->getSubject() === 'renamed_by') {
+            $subject = $this->l->t('Renamed by {user}');
+            $this->setIcon($event, 'change');
+        } else if ($event->getSubject() === 'moved_by') {
+            $subject = $this->l->t('Moved by {user}');
+            $this->setIcon($event, 'change');
+        } else {
+            throw new \InvalidArgumentException();
+        }
+
+        if (!isset($parsedParameters['user'])) {
+            // External user via public link share
+            $subject = str_replace('{user}', $this->activityLang->t('"remote user"'), $subject);
+        }
+
+        $this->setSubjects($event, $subject, $parsedParameters);
+
+        return $this->eventMerger->mergeEvents('user', $event, $previousEvent);
+    }
+
+    /**
+     * @param IEvent $event
+     * @param IEvent|null $previousEvent
+     * @return IEvent
+     * @throws \InvalidArgumentException
+     * @since 11.0.0
+     */
+    public function parseLongVersion(IEvent $event, IEvent $previousEvent = null) {
+        $this->fileIsEncrypted = false;
+        $parsedParameters = $this->getParameters($event);
+
+        if ($event->getSubject() === 'created_self') {
+            $subject = $this->l->t('You created {file}');
+            if ($this->fileIsEncrypted) {
+                $subject = $this->l->t('You created an encrypted file in {file}');
+            }
+            $this->setIcon($event, 'add-color');
+        } else if ($event->getSubject() === 'created_by') {
+            $subject = $this->l->t('{user} created {file}');
+            if ($this->fileIsEncrypted) {
+                $subject = $this->l->t('{user} created an encrypted file in {file}');
+            }
+            $this->setIcon($event, 'add-color');
+        } else if ($event->getSubject() === 'created_public') {
+            $subject = $this->l->t('{file} was created in a public folder');
+            $this->setIcon($event, 'add-color');
+        } else if ($event->getSubject() === 'changed_self') {
+            $subject = $this->l->t('You changed {file}');
+            if ($this->fileIsEncrypted) {
+                $subject = $this->l->t('You changed an encrypted file in {file}');
+            }
+            $this->setIcon($event, 'change');
+        } else if ($event->getSubject() === 'changed_by') {
+            $subject = $this->l->t('{user} changed {file}');
+            if ($this->fileIsEncrypted) {
+                $subject = $this->l->t('{user} changed an encrypted file in {file}');
+            }
+            $this->setIcon($event, 'change');
+        } else if ($event->getSubject() === 'deleted_self') {
+            $subject = $this->l->t('You deleted {file}');
+            if ($this->fileIsEncrypted) {
+                $subject = $this->l->t('You deleted an encrypted file in {file}');
+            }
+            $this->setIcon($event, 'delete-color');
+        } else if ($event->getSubject() === 'deleted_by') {
+            $subject = $this->l->t('{user} deleted {file}');
+            if ($this->fileIsEncrypted) {
+                $subject = $this->l->t('{user} deleted an encrypted file in {file}');
+            }
+            $this->setIcon($event, 'delete-color');
+        } else if ($event->getSubject() === 'restored_self') {
+            $subject = $this->l->t('You restored {file}');
+            $this->setIcon($event, 'actions/history', 'core');
+        } else if ($event->getSubject() === 'restored_by') {
+            $subject = $this->l->t('{user} restored {file}');
+            $this->setIcon($event, 'actions/history', 'core');
+        } else if ($event->getSubject() === 'renamed_self') {
+            $subject = $this->l->t('You renamed {oldfile} to {newfile}');
+            $this->setIcon($event, 'change');
+        } else if ($event->getSubject() === 'renamed_by') {
+            $subject = $this->l->t('{user} renamed {oldfile} to {newfile}');
+            $this->setIcon($event, 'change');
+        } else if ($event->getSubject() === 'moved_self') {
+            $subject = $this->l->t('You moved {oldfile} to {newfile}');
+            $this->setIcon($event, 'change');
+        } else if ($event->getSubject() === 'moved_by') {
+            $subject = $this->l->t('{user} moved {oldfile} to {newfile}');
+            $this->setIcon($event, 'change');
+        } else {
+            throw new \InvalidArgumentException();
+        }
+
+        if ($this->fileIsEncrypted) {
+            $event->setSubject($event->getSubject() . '_enc', $event->getSubjectParameters());
+        }
+
+        if (!isset($parsedParameters['user'])) {
+            // External user via public link share
+            $subject = str_replace('{user}', $this->activityLang->t('"remote user"'), $subject);
+        }
+
+        $this->setSubjects($event, $subject, $parsedParameters);
+
+        if ($event->getSubject() === 'moved_self' || $event->getSubject() === 'moved_by') {
+            $event = $this->eventMerger->mergeEvents('oldfile', $event, $previousEvent);
+        } else {
+            $event = $this->eventMerger->mergeEvents('file', $event, $previousEvent);
+        }
+
+        if ($event->getChildEvent() === null) {
+            // Couldn't group by file, maybe we can group by user
+            $event = $this->eventMerger->mergeEvents('user', $event, $previousEvent);
+        }
+
+        return $event;
+    }
+
+    protected function setSubjects(IEvent $event, $subject, array $parameters) {
+        $placeholders = $replacements = [];
+        foreach ($parameters as $placeholder => $parameter) {
+            $placeholders[] = '{' . $placeholder . '}';
+            if ($parameter['type'] === 'file') {
+                $replacements[] = $parameter['path'];
+            } else {
+                $replacements[] = $parameter['name'];
+            }
+        }
+
+        $event->setParsedSubject(str_replace($placeholders, $replacements, $subject))
+            ->setRichSubject($subject, $parameters);
+    }
+
+    /**
+     * @param IEvent $event
+     * @return array
+     * @throws \InvalidArgumentException
+     */
+    protected function getParameters(IEvent $event) {
+        $parameters = $event->getSubjectParameters();
+        switch ($event->getSubject()) {
+            case 'created_self':
+            case 'created_public':
+            case 'changed_self':
+            case 'deleted_self':
+            case 'restored_self':
+                return [
+                    'file' => $this->getFile($parameters[0], $event),
+                ];
+            case 'created_by':
+            case 'changed_by':
+            case 'deleted_by':
+            case 'restored_by':
+                if ($parameters[1] === '') {
+                    // External user via public link share
+                    return [
+                        'file' => $this->getFile($parameters[0], $event),
+                    ];
+                }
+                return [
+                    'file' => $this->getFile($parameters[0], $event),
+                    'user' => $this->getUser($parameters[1]),
+                ];
+            case 'renamed_self':
+            case 'moved_self':
+                return [
+                    'newfile' => $this->getFile($parameters[0]),
+                    'oldfile' => $this->getFile($parameters[1]),
+                ];
+            case 'renamed_by':
+            case 'moved_by':
+                if ($parameters[1] === '') {
+                    // External user via public link share
+                    return [
+                        'newfile' => $this->getFile($parameters[0]),
+                        'oldfile' => $this->getFile($parameters[2]),
+                    ];
+                }
+                return [
+                    'newfile' => $this->getFile($parameters[0]),
+                    'user' => $this->getUser($parameters[1]),
+                    'oldfile' => $this->getFile($parameters[2]),
+                ];
+        }
+        return [];
+    }
+
+    /**
+     * @param array|string $parameter
+     * @param IEvent|null $event
+     * @return array
+     * @throws \InvalidArgumentException
+     */
+    protected function getFile($parameter, IEvent $event = null) {
+        if (is_array($parameter)) {
+            $path = reset($parameter);
+            $id = (string) key($parameter);
+        } else if ($event !== null) {
+            // Legacy from before ownCloud 8.2
+            $path = $parameter;
+            $id = $event->getObjectId();
+        } else {
+            throw new \InvalidArgumentException('Could not generate file parameter');
+        }
+
+        $encryptionContainer = $this->getEndToEndEncryptionContainer($id, $path);
+        if ($encryptionContainer instanceof Folder) {
+            $this->fileIsEncrypted = true;
+            try {
+                $fullPath = rtrim($encryptionContainer->getPath(), '/');
+                // Remove /user/files/...
+                list(,,, $path) = explode('/', $fullPath, 4);
+                if (!$path) {
+                    throw new InvalidPathException('Path could not be split correctly');
+                }
+
+                return [
+                    'type' => 'file',
+                    'id' => $encryptionContainer->getId(),
+                    'name' => $encryptionContainer->getName(),
+                    'path' => $path,
+                    'link' => $this->url->linkToRouteAbsolute('files.viewcontroller.showFile', ['fileid' => $encryptionContainer->getId()]),
+                ];
+            } catch (\Exception $e) {
+                // fall back to the normal one
+                $this->fileIsEncrypted = false;
+            }
+        }
+
+        return [
+            'type' => 'file',
+            'id' => $id,
+            'name' => basename($path),
+            'path' => trim($path, '/'),
+            'link' => $this->url->linkToRouteAbsolute('files.viewcontroller.showFile', ['fileid' => $id]),
+        ];
+    }
+
+    protected $fileEncrypted = [];
+
+    /**
+     * Check if a file is end2end encrypted
+     * @param int $fileId
+     * @param string $path
+     * @return Folder|null
+     */
+    protected function getEndToEndEncryptionContainer($fileId, $path) {
+        if (isset($this->fileEncrypted[$fileId])) {
+            return $this->fileEncrypted[$fileId];
+        }
+
+        $fileName = basename($path);
+        if (!preg_match('/^[0-9a-fA-F]{32}$/', $fileName)) {
+            $this->fileEncrypted[$fileId] = false;
+            return $this->fileEncrypted[$fileId];
+        }
+
+        $userFolder = $this->rootFolder->getUserFolder($this->activityManager->getCurrentUserId());
+        $files = $userFolder->getById($fileId);
+        if (empty($files)) {
+            try {
+                // Deleted, try with parent
+                $file = $this->findExistingParent($userFolder, dirname($path));
+            } catch (NotFoundException $e) {
+                return null;
+            }
+
+            if (!$file instanceof Folder || !$file->isEncrypted()) {
+                return null;
+            }
+
+            $this->fileEncrypted[$fileId] = $file;
+            return $file;
+        }
+
+        $file = array_shift($files);
+
+        if ($file instanceof Folder && $file->isEncrypted()) {
+            // If the folder is encrypted, it is the Container,
+            // but can be the name is just fine.
+            $this->fileEncrypted[$fileId] = true;
+            return null;
+        }
+
+        $this->fileEncrypted[$fileId] = $this->getParentEndToEndEncryptionContainer($userFolder, $file);
+        return $this->fileEncrypted[$fileId];
+    }
+
+    /**
+     * @param Folder $userFolder
+     * @param string $path
+     * @return Folder
+     * @throws NotFoundException
+     */
+    protected function findExistingParent(Folder $userFolder, $path) {
+        if ($path === '/') {
+            throw new NotFoundException('Reached the root');
+        }
+
+        try {
+            $folder = $userFolder->get(dirname($path));
+        } catch (NotFoundException $e) {
+            return $this->findExistingParent($userFolder, dirname($path));
+        }
+
+        return $folder;
+    }
+
+    /**
+     * Check all parents until the user's root folder if one is encrypted
+     *
+     * @param Folder $userFolder
+     * @param Node $file
+     * @return Node|null
+     */
+    protected function getParentEndToEndEncryptionContainer(Folder $userFolder, Node $file) {
+        try {
+            $parent = $file->getParent();
+
+            if ($userFolder->getId() === $parent->getId()) {
+                return null;
+            }
+        } catch (\Exception $e) {
+            return null;
+        }
+
+        if ($parent->isEncrypted()) {
+            return $parent;
+        }
+
+        return $this->getParentEndToEndEncryptionContainer($userFolder, $parent);
+    }
+
+    /**
+     * @param string $uid
+     * @return array
+     */
+    protected function getUser($uid) {
+        if (!isset($this->displayNames[$uid])) {
+            $this->displayNames[$uid] = $this->getDisplayName($uid);
+        }
+
+        return [
+            'type' => 'user',
+            'id' => $uid,
+            'name' => $this->displayNames[$uid],
+        ];
+    }
+
+    /**
+     * @param string $uid
+     * @return string
+     */
+    protected function getDisplayName($uid) {
+        $user = $this->userManager->get($uid);
+        if ($user instanceof IUser) {
+            return $user->getDisplayName();
+        } else {
+            return $uid;
+        }
+    }
 }