Add address book plugins

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

apps/dav/composer/composer/autoload_classmap.php

@@ -91,6 +91,8 @@ return array(
     'OCA\\DAV\\CardDAV\\Converter' => $baseDir . '/../lib/CardDAV/Converter.php',
     'OCA\\DAV\\CardDAV\\HasPhotoPlugin' => $baseDir . '/../lib/CardDAV/HasPhotoPlugin.php',
     'OCA\\DAV\\CardDAV\\ImageExportPlugin' => $baseDir . '/../lib/CardDAV/ImageExportPlugin.php',
+    'OCA\\DAV\\CardDAV\\Integration\\ExternalAddressBook' => $baseDir . '/../lib/CardDAV/Integration/ExternalAddressBook.php',
+    'OCA\\DAV\\CardDAV\\Integration\\IAddressBookProvider' => $baseDir . '/../lib/CardDAV/Integration/IAddressBookProvider.php',
     'OCA\\DAV\\CardDAV\\MultiGetExportPlugin' => $baseDir . '/../lib/CardDAV/MultiGetExportPlugin.php',
     'OCA\\DAV\\CardDAV\\PhotoCache' => $baseDir . '/../lib/CardDAV/PhotoCache.php',
     'OCA\\DAV\\CardDAV\\Plugin' => $baseDir . '/../lib/CardDAV/Plugin.php',

apps/dav/composer/composer/autoload_static.php

@@ -106,6 +106,8 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\CardDAV\\Converter' => __DIR__ . '/..' . '/../lib/CardDAV/Converter.php',
         'OCA\\DAV\\CardDAV\\HasPhotoPlugin' => __DIR__ . '/..' . '/../lib/CardDAV/HasPhotoPlugin.php',
         'OCA\\DAV\\CardDAV\\ImageExportPlugin' => __DIR__ . '/..' . '/../lib/CardDAV/ImageExportPlugin.php',
+        'OCA\\DAV\\CardDAV\\Integration\\ExternalAddressBook' => __DIR__ . '/..' . '/../lib/CardDAV/Integration/ExternalAddressBook.php',
+        'OCA\\DAV\\CardDAV\\Integration\\IAddressBookProvider' => __DIR__ . '/..' . '/../lib/CardDAV/Integration/IAddressBookProvider.php',
         'OCA\\DAV\\CardDAV\\MultiGetExportPlugin' => __DIR__ . '/..' . '/../lib/CardDAV/MultiGetExportPlugin.php',
         'OCA\\DAV\\CardDAV\\PhotoCache' => __DIR__ . '/..' . '/../lib/CardDAV/PhotoCache.php',
         'OCA\\DAV\\CardDAV\\Plugin' => __DIR__ . '/..' . '/../lib/CardDAV/Plugin.php',

apps/dav/lib/AppInfo/PluginManager.php

@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * @copyright Copyright (c) 2016, ownCloud GmbH.
  *
@@ -26,8 +29,12 @@ namespace OCA\DAV\AppInfo;
 
 use OC\ServerContainer;
 use OCA\DAV\CalDAV\Integration\ICalendarProvider;
+use OCA\DAV\CardDAV\Integration\IAddressBookProvider;
 use OCP\App\IAppManager;
 use OCP\AppFramework\QueryException;
+use function array_map;
+use function class_exists;
+use function is_array;
 
 /**
  * Manager for DAV plugins from apps, used to register them
@@ -59,6 +66,13 @@ class PluginManager {
 	 */
 	private $collections = null;
 
+	/**
+	 * Address book plugins
+	 *
+	 * @var IAddressBookProvider[]|null
+	 */
+	private $addressBookPlugins = null;
+
 	/**
 	 * Calendar plugins
 	 *
@@ -101,6 +115,16 @@ class PluginManager {
 		return $this->collections;
 	}
 
+	/**
+	 * @return IAddressBookProvider[]
+	 */
+	public function getAddressBookPlugins(): array {
+		if ($this->addressBookPlugins === null) {
+			$this->populate();
+		}
+		return $this->addressBookPlugins;
+	}
+
 	/**
 	 * Returns an array of app-registered calendar plugins
 	 *
@@ -128,6 +152,7 @@ class PluginManager {
 			}
 			$this->loadSabrePluginsFromInfoXml($this->extractPluginList($info));
 			$this->loadSabreCollectionsFromInfoXml($this->extractCollectionList($info));
+			$this->loadSabreAddressBookPluginsFromInfoXml($this->extractAddressBookPluginList($info));
 			$this->loadSabreCalendarPluginsFromInfoXml($this->extractCalendarPluginList($info));
 		}
 	}
@@ -162,6 +187,29 @@ class PluginManager {
 		return [];
 	}
 
+	/**
+	 * @param array $array
+	 *
+	 * @return string[]
+	 */
+	private function extractAddressBookPluginList(array $array):array {
+		if (!isset($array['sabre']) || !is_array($array['sabre'])) {
+			return [];
+		}
+		if (!isset($array['sabre']['address-book-plugins']) || !is_array($array['sabre']['address-book-plugins'])) {
+			return [];
+		}
+		if (!isset($array['sabre']['address-book-plugins']['plugin'])) {
+			return [];
+		}
+
+		$items = $array['sabre']['address-book-plugins']['plugin'];
+		if (!is_array($items)) {
+			$items = [$items];
+		}
+		return $items;
+	}
+
 	private function extractCalendarPluginList(array $array):array {
 		if (isset($array['sabre']) && is_array($array['sabre'])) {
 			if (isset($array['sabre']['calendar-plugins']) && is_array($array['sabre']['calendar-plugins'])) {
@@ -205,6 +253,31 @@ class PluginManager {
 		}
 	}
 
+	private function createPluginInstance(string $className) {
+		try {
+			return $this->container->query($className);
+		} catch (QueryException $e) {
+			if (class_exists($className)) {
+				return new $className();
+			}
+		}
+
+		throw new \Exception("Sabre plugin class '$className' is unknown and could not be loaded");
+	}
+
+	/**
+	 * @param string[] $plugin
+	 */
+	private function loadSabreAddressBookPluginsFromInfoXml(array $plugins): void {
+		$this->addressBookPlugins = array_map(function(string $className): IAddressBookProvider {
+			$instance = $this->createPluginInstance($className);
+			if (!($instance instanceof IAddressBookProvider)) {
+				throw new \Exception("Sabre address book plugin class '$className' does not implement the \OCA\DAV\CardDAV\Integration\IAddressBookProvider interface");
+			}
+			return $instance;
+		}, $plugins);
+	}
+
 	private function loadSabreCalendarPluginsFromInfoXml(array $calendarPlugins):void {
 		foreach ($calendarPlugins as $calendarPlugin) {
 			try {

apps/dav/lib/CardDAV/Integration/ExternalAddressBook.php

@@ -0,0 +1,113 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\DAV\CardDAV\Integration;
+
+use Sabre\CardDAV\IAddressBook;
+use Sabre\DAV;
+
+/**
+ * @since 19.0.0
+ */
+abstract class ExternalAddressBook implements IAddressBook, DAV\IProperties {
+
+	/** @var string */
+	private const PREFIX = 'app-generated';
+
+	/**
+	 * @var string
+	 *
+	 * Double dash is a valid delimiter,
+	 * because it will always split the URIs correctly:
+	 * - our prefix contains only one dash and won't be split
+	 * - appIds are not allowed to contain dashes as per spec:
+	 * > must contain only lowercase ASCII characters and underscore
+	 * - explode has a limit of three, so even if the app-generated
+	 *   URI has double dashes, it won't be split
+	 */
+	private const DELIMITER = '--';
+
+	/** @var string */
+	private $appId;
+
+	/** @var string */
+	private $uri;
+
+	/**
+	 * @param string $appId
+	 * @param string $uri
+	 */
+	public function __construct(string $appId, string $uri) {
+		$this->appId = $appId;
+		$this->uri = $uri;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	final public function getName() {
+		return implode(self::DELIMITER, [
+			self::PREFIX,
+			$this->appId,
+			$this->uri,
+		]);
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	final public function setName($name) {
+		throw new DAV\Exception\MethodNotAllowed('Renaming address books is not yet supported');
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	final public function createDirectory($name) {
+		throw new DAV\Exception\MethodNotAllowed('Creating collections in address book objects is not allowed');
+
+	}
+
+	/**
+	 * Checks whether the address book uri is app-generated
+	 *
+	 * @param string $uri
+	 *
+	 * @return bool
+	 */
+	public static function isAppGeneratedAddressBook(string $uri): bool {
+		return strpos($uri, self::PREFIX) === 0 && substr_count($uri, self::DELIMITER) >= 2;
+	}
+
+	/**
+	 * Splits an app-generated uri into appId and uri
+	 *
+	 * @param string $uri
+	 *
+	 * @return array
+	 */
+	public static function splitAppGeneratedAddressBookUri(string $uri): array {
+		$array = array_slice(explode(self::DELIMITER, $uri, 3), 1);
+		// Check the array has expected amount of elements
+		// and none of them is an empty string
+		if (\count($array) !== 2 || \in_array('', $array, true)) {
+			throw new \InvalidArgumentException('Provided address book uri was not app-generated');
+		}
+
+		return $array;
+	}
+
+	/**
+	 * Checks whether a address book name the user wants to create violates
+	 * the reserved name for URIs
+	 *
+	 * @param string $uri
+	 *
+	 * @return bool
+	 */
+	public static function doesViolateReservedName(string $uri): bool {
+		return strpos($uri, self::PREFIX) === 0;
+	}
+
+}

apps/dav/lib/CardDAV/Integration/IAddressBookProvider.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\DAV\CardDAV\Integration;
+
+use Sabre\CardDAV\IAddressBook;
+
+/**
+ * @since 19.0.0
+ */
+interface IAddressBookProvider {
+
+	/**
+	 * Provides the appId of the plugin
+	 *
+	 * @since 19.0.0
+	 * @return string AppId
+	 */
+	public function getAppId(): string;
+
+	/**
+	 * Fetches all calendars for a given principal uri
+	 *
+	 * @since 19.0.0
+	 * @param string $principalUri E.g. principals/users/user1
+	 * @return ExternalAddressBook[] Array of all calendars
+	 */
+	public function fetchAllForCalendarHome(string $principalUri): array;
+
+	/**
+	 * Checks whether plugin has a calendar for a given principalUri and calendarUri
+	 *
+	 * @since 19.0.0
+	 * @param string $principalUri E.g. principals/users/user1
+	 * @param string $calendarUri E.g. personal
+	 * @return bool True if calendar for principalUri and calendarUri exists, false otherwise
+	 */
+	public function hasCalendarInCalendarHome(string $principalUri, string $calendarUri): bool;
+
+	/**
+	 * Fetches a calendar for a given principalUri and calendarUri
+	 * Returns null if calendar does not exist
+	 *
+	 * @param string $principalUri E.g. principals/users/user1
+	 * @param string $calendarUri E.g. personal
+	 *
+	 * @return ExternalAddressBook|null Calendar if it exists, null otherwise
+	 *@since 19.0.0
+	 */
+	public function getCalendarInCalendarHome(string $principalUri, string $calendarUri): ?ExternalAddressBook;
+
+}