2 files changed, 134 insertions, 0 deletions
diff --git a/lib/private/Talk/Broker.php b/lib/private/Talk/Broker.php
new file mode 100644
index 00000000000..86e7e7ff4c1
--- /dev/null
+++ b/lib/private/Talk/Broker.php
@@ -0,0 +1,101 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\Talk;
+
+use OC\AppFramework\Bootstrap\Coordinator;
+use OCP\IServerContainer;
+use OCP\Talk\Exceptions\NoBackendException;
+use OCP\Talk\IBroker;
+use OCP\Talk\IConversation;
+use OCP\Talk\IConversationOptions;
+use OCP\Talk\ITalkBackend;
+use Psr\Log\LoggerInterface;
+use RuntimeException;
+use Throwable;
+
+class Broker implements IBroker {
+	private Coordinator $coordinator;
+
+	private IServerContainer $container;
+
+	private LoggerInterface $logger;
+
+	private ?bool $hasBackend = null;
+
+	private ?ITalkBackend $backend = null;
+
+	public function __construct(Coordinator $coordinator,
+		IServerContainer $container,
+		LoggerInterface $logger) {
+		$this->coordinator = $coordinator;
+		$this->container = $container;
+		$this->logger = $logger;
+	}
+
+	public function hasBackend(): bool {
+		if ($this->hasBackend !== null) {
+			return $this->hasBackend;
+		}
+
+		$context = $this->coordinator->getRegistrationContext();
+		if ($context === null) {
+			// Backend requested too soon, e.g. from the bootstrap `register` method of an app
+			throw new RuntimeException('Not all apps have been registered yet');
+		}
+		$backendRegistration = $context->getTalkBackendRegistration();
+		if ($backendRegistration === null) {
+			// Nothing to do. Remember and exit.
+			return $this->hasBackend = false;
+		}
+
+		try {
+			$this->backend = $this->container->get(
+				$backendRegistration->getService()
+			);
+
+			// Remember and return
+			return $this->hasBackend = true;
+		} catch (Throwable $e) {
+			$this->logger->error('Talk backend {class} could not be loaded: ' . $e->getMessage(), [
+				'class' => $backendRegistration->getService(),
+				'exception' => $e,
+			]);
+
+			// Temporary result. Maybe the next time the backend is requested it can be loaded.
+			return false;
+		}
+	}
+
+	public function newConversationOptions(): IConversationOptions {
+		return ConversationOptions::default();
+	}
+
+	public function createConversation(string $name,
+		array $moderators,
+		?IConversationOptions $options = null): IConversation {
+		if (!$this->hasBackend()) {
+			throw new NoBackendException('The Talk broker has no registered backend');
+		}
+
+		return $this->backend->createConversation(
+			$name,
+			$moderators,
+			$options ?? ConversationOptions::default()
+		);
+	}
+
+	public function deleteConversation(string $id): void {
+		if (!$this->hasBackend()) {
+			throw new NoBackendException('The Talk broker has no registered backend');
+		}
+
+		$this->backend->deleteConversation($id);
+	}
+}
diff --git a/lib/private/Talk/ConversationOptions.php b/lib/private/Talk/ConversationOptions.php
new file mode 100644
index 00000000000..f167fa6d164
--- /dev/null
+++ b/lib/private/Talk/ConversationOptions.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\Talk;
+
+use OCP\Talk\IConversationOptions;
+
+class ConversationOptions implements IConversationOptions {
+	private bool $isPublic;
+
+	private function __construct(bool $isPublic) {
+		$this->isPublic = $isPublic;
+	}
+
+	public static function default(): self {
+		return new self(false);
+	}
+
+	public function setPublic(bool $isPublic = true): IConversationOptions {
+		$this->isPublic = $isPublic;
+		return $this;
+	}
+
+	public function isPublic(): bool {
+		return $this->isPublic;
+	}
+}