manage multiple well-known services

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

.gitignore

@@ -1,6 +1,7 @@
 js/
 \.idea/
 node_modules/
+build/
 vendor/
 img/twemoji/
 

lib/WellKnown/JrdResponse.php

@@ -6,6 +6,7 @@ declare(strict_types=1);
  * @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
  *
  * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Maxence Lange <maxence@artificial-owl.com>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -58,7 +59,7 @@ final class JrdResponse implements IResponse {
 	 *
 	 * @since 21.0.0
 	 */
-	public function __construct(string $subject, int $httpCode = Http::STATUS_OK) {
+	public function __construct(string $subject = '', int $httpCode = Http::STATUS_OK) {
 		$this->subject = $subject;
 		$this->httpCode = $httpCode;
 	}

lib/WellKnown/WebfingerHandler.php

@@ -27,6 +27,8 @@ namespace OCA\Social\WellKnown;
 
 use OCA\Social\Db\CacheActorsRequest;
 use OCA\Social\Exceptions\CacheActorDoesNotExistException;
+use OCA\Social\Exceptions\SocialAppConfigException;
+use OCA\Social\Exceptions\UnauthorizedFediverseException;
 use OCA\Social\Service\CacheActorService;
 use OCA\Social\Service\ConfigService;
 use OCA\Social\Service\FediverseService;
@@ -55,12 +57,51 @@ class WebfingerHandler implements IHandler {
 		$this->configService = $configService;
 	}
 
-	public function handle(string $service, IRequestContext $context, ?IResponse $previousResponse): ?IResponse {
-		// See https://docs.joinmastodon.org/spec/webfinger/
 
-		$this->fediverseService->jailed();
+	/**
+	 * @see https://docs.joinmastodon.org/spec/webfinger/
+	 *
+	 * @param string $service
+	 * @param IRequestContext $context
+	 * @param IResponse|null $previousResponse
+	 *
+	 * @return IResponse|null
+	 */
+	public function handle(
+		string $service,
+		IRequestContext $context,
+		?IResponse $previousResponse
+	): ?IResponse {
+		try {
+			$this->fediverseService->jailed();
+		} catch (UnauthorizedFediverseException $e) {
+			return null;
+		}
+
+		switch (strtolower($service)) {
+			case 'webfinger':
+				return $this->handleWebfinger($context);
+
+			case 'nodeinfo':
+				return $this->handleNodeInfo($context);
+
+			case 'host-meta':
+				return $this->handleHostMeta($context);
+		}
+
+		return null;
+	}
+
+
+	/**
+	 * handle request on /.well-known/webfinger
+	 *
+	 * @param IRequestContext $context
+	 *
+	 * @return IResponse|null
+	 */
+	public function handleWebfinger(IRequestContext $context): ?IResponse {
 		$subject = $context->getHttpRequest()->getParam('resource');
-
 		if (strpos($subject, 'acct:') === 0) {
 			$subject = substr($subject, 5);
 		}
@@ -68,6 +109,8 @@ class WebfingerHandler implements IHandler {
 		$actor = null;
 		try {
 			$actor = $this->cacheActorService->getFromLocalAccount($subject);
+		} catch (SocialAppConfigException $e) {
+			return null;
 		} catch (CacheActorDoesNotExistException $e) {
 		}
 
@@ -81,7 +124,7 @@ class WebfingerHandler implements IHandler {
 		if ($actor === null || !$actor->isLocal()) {
 			return new JrdResponse('', Http::STATUS_NOT_FOUND);
 		}
-		
+
 		// ActivityPub profile
 		$href = $this->configService->getSocialUrl() . '@' . $actor->getPreferredUsername();
 		$href = rtrim($href, '/');
@@ -109,4 +152,46 @@ class WebfingerHandler implements IHandler {
 
 		return $response;
 	}
+
+
+	/**
+	 * handle request on /.well-known/nodeinfo
+	 * returns Json
+	 *
+	 * @param IRequestContext $context
+	 *
+	 * @return IResponse|null
+	 */
+	private function handleNodeInfo(IRequestContext $context): ?IResponse {
+		$response = new JrdResponse();
+		$response->addLink(
+			'http://nodeinfo.diaspora.software/ns/schema/2.0',
+			null,
+			$this->urlGenerator->linkToRouteAbsolute('social.OAuth.nodeinfo2')
+		);
+
+		return $response;
+	}
+
+
+	/**
+	 * handle request on /.well-known/host-meta
+	 * returns xml/xrd
+	 *
+	 * @param IRequestContext $context
+	 *
+	 * @return IResponse|null
+	 */
+	private function handleHostMeta(IRequestContext $context): ?IResponse {
+		$response = new XrdResponse();
+		try {
+			$url = $this->configService->getCloudUrl(true) . '/.well-known/webfinger?resource={uri}';
+		} catch (SocialAppConfigException $e) {
+			return null;
+		}
+
+		$response->addLink('lrdd', $url);
+
+		return $response;
+	}
 }

lib/WellKnown/XrdResponse.php

@@ -0,0 +1,99 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2022 Maxence Lange <maxence@artificial-owl.com>
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\Social\WellKnown;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Response;
+use OCP\AppFramework\Http\TextPlainResponse;
+use OCP\Http\WellKnown\IResponse;
+
+final class XrdResponse implements IResponse {
+	private ?string $expires = null;
+	private int $httpCode;
+
+	/** @var mixed[] */
+	private array $links = [];
+
+	public function __construct(int $httpCode = Http::STATUS_OK) {
+		$this->httpCode = $httpCode;
+	}
+
+	/**
+	 * @param string $expires
+	 *
+	 * @return $this
+	 *
+	 * @since 21.0.0
+	 */
+	public function setExpires(string $expires): self {
+		$this->expires = $expires;
+
+		return $this;
+	}
+
+
+	public function setHttpCode(int $httpCode): self {
+		$this->httpCode = $httpCode;
+
+		return $this;
+	}
+
+	/**
+	 * Add a link
+	 *
+	 * @param string $rel
+	 * @param string $template
+	 *
+	 * @return XrdResponse
+	 */
+	public function addLink(string $rel, string $template): self {
+		$this->links[] = [
+			'rel' => $rel,
+			'template' => $template
+		];
+
+		return $this;
+	}
+
+
+	public function toHttpResponse(): Response {
+		$data = [];
+		$data[] = '<?xml version="1.0" encoding="UTF-8"?>';
+		$data[] = '<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">';
+
+		foreach ($this->links as $link) {
+			$data[] = '  <Link rel="' . $link['rel'] . '"  template="' . $link['template'] . '"/>';
+		}
+
+		$data[] = '</XRD>';
+
+		$response = new TextPlainResponse(implode("\n", $data) . "\n", $this->httpCode);
+		$response->addHeader('Content-Type', 'application/xrd+xml'); // overwrite default header
+
+		return $response;
+	}
+}