Example App

apps/files_checksum_store/appinfo/app.php

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+<?php
+/**
+ * @author Roeland Jago Douma <[email protected]>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\Files_Checksum_Store\AppInfo;
+
+$app = new Application();
+$c = $app->getContainer();
+
+\OCA\Files_Checksum_Store\Provider::register($c->getServer()->getChecksumManager(), $c);

apps/files_checksum_store/appinfo/application.php

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+<?php
+/**
+ * @author Roeland Jago Douma <[email protected]>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\Files_Checksum_Store\AppInfo;
+
+use OCP\AppFramework\App;
+use OCA\Files_Checksum_Store\Provider;
+use OCP\IContainer;
+
+class Application extends App {
+
+	public function __construct (array $urlParams = array()) {
+		parent::__construct('files_checksum_store', $urlParams);
+		$container = $this->getContainer();
+
+		$container->registerService('Provider', function(IContainer $c) {
+			/** @var \OC\Server $server */
+			$server = $c->query('ServerContainer');
+			return new Provider($server->getDatabaseConnection());
+		});
+	}
+
+}

apps/files_checksum_store/appinfo/database.xml

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+<?xml version="1.0" encoding="ISO-8859-1" ?>
+<database>
+	<name>*dbname*</name>
+	<create>true</create>
+	<overwrite>false</overwrite>
+	<charset>utf8</charset>
+	<table>
+		<name>*dbprefix*checksum</name>
+		<declaration>
+			<field>
+				<name>file_id</name>
+				<type>integer</type>
+				<default>0</default>
+				<notnull>true</notnull>
+				<length>4</length>
+			</field>
+			<field>
+				<name>checksum_id</name>
+				<type>integer</type>
+				<default>0</default>
+				<notnull>true</notnull>
+				<length>4</length>
+			</field>
+			<field>
+				<name>checksum</name>
+				<type>text</type>
+				<default>0</default>
+				<notnull>true</notnull>
+				<length>255</length>
+			</field>
+
+			<index>
+				<name>checksum_fileid_checksumid</name>
+				<primary>true</primary>
+				<unique>true</unique>
+				<field>
+					<name>file_id</name>
+				</field>
+				<field>
+					<name>checksum_id</name>
+				</field>
+			</index>
+
+			<index>
+				<name>checksum_fileid</name>
+				<field>
+					<name>file_id</name>
+				</field>
+			</index>
+		</declaration>
+	</table>
+</database>

apps/files_checksum_store/appinfo/info.xml

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+<?xml version="1.0"?>
+<info>
+	<id>files_checksum_store</id>
+	<name>Store Checksums</name>
+	<description>
+		On upload clients can store a checksum which will be returned on downloads and propfinds.
+	</description>
+	<licence>AGPL</licence>
+	<author>Roeland Jago Douma</author>
+	<default_enable/>
+	<version>0.0.1</version>
+	<types>
+		<filesystem/>
+	</types>
+	<dependencies>
+		<owncloud min-version="9.0" max-version="9.0" />
+	</dependencies>
+</info>

apps/files_checksum_store/lib/provider.php

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+<?php
+/**
+ * @author Roeland Jago Douma <[email protected]>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\Files_Checksum_Store;
+
+use OCP\Files\Checksum\IProvider;
+use OCP\Files\Checksum\IManager;
+use OCP\Files\Checksum\UnsupportedChecksumTypeException;
+use OCP\AppFramework\IAppContainer;
+use OCP\Files\File;
+use OCP\IDBConnection;
+
+class Provider implements IProvider {
+
+
+	/** @var IDBConnection */
+	private $connection;
+
+	public function __construct(\OCP\IDBConnection $connection) {
+		$this->connection = $connection;
+	}
+
+	public static function register(IManager $cm, IAppContainer $container) {
+		$cm->registerProvider(function() use ($container) {
+			return $container->query('Provider');
+		});
+	}
+
+	public static function supportedChecksums() {
+		return [
+			'MD5'      => 1,
+			'SHA-1'    => 2,
+			'ADLER-32' => 3,
+		];
+	}
+
+	public function addChecksum(File $file, $type, $checksum) {
+		$type = strtoupper($type);
+
+		if (!in_array($type, array_keys($this->supportedChecksums()))) {
+			throw new UnsupportedChecksumTypeException();
+		}
+
+		$qb = $this->connection->getQueryBuilder();
+
+		$qb->insert('checksum')
+			->setValue('file_id', $qb->createNamedParameter($file->getId()))
+			->setValue('checksum_id', $qb->createNamedParameter($this->supportedChecksums()[$type]))
+			->setValue('checksum', $qb->createNamedParameter($checksum))
+			->execute();
+
+		return true;
+	}
+
+	public function getChecksums(File $file) {
+		$supportedChecksums = array_flip($this->supportedChecksums());
+
+		$qb = $this->connection->getQueryBuilder();
+		$stmt = $qb->select('checksum_id', 'checksum')
+			->from('checksum')
+			->where($qb->expr()->eq('file_id', $qb->createNamedParameter($file->getId())))
+			->execute();
+
+		$checksums = [];
+		while($data = $stmt->fetch()) {
+			$type = (int)$data['checksum_id'];
+			if (!in_array($type, array_keys($supportedChecksums))) {
+				continue;
+			}
+
+			$checksums[$supportedChecksums[$type]] = $data['checksum'];
+		}
+		$stmt->closeCursor();
+
+		return $checksums;
+	}
+
+	public function clearChecksums(File $file) {
+		$qb = $this->connection->getQueryBuilder();
+
+		$qb->delete('checksum')
+			->where($qb->expr()->eq('file_id', $qb->createNamedParameter($file->getId())))
+			->execute();
+	}
+}