Fix JrdResponse not containing template

For now this is modified JrdResponse from
nextcloud/server#26178

Let's hope that we can switch to the OCP one in NC 25

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

lib/WellKnown/JrdResponse.php

@@ -0,0 +1,174 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @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\JSONResponse;
+use OCP\AppFramework\Http\Response;
+use OCP\Http\WellKnow\IResponse;
+use function array_filter;
+
+/**
+ * A JSON Document Format (JDF) response to a well-known request
+ *
+ * @ref https://tools.ietf.org/html/rfc6415#appendix-A
+ * @ref https://tools.ietf.org/html/rfc7033#section-4.4
+ */
+final class JrdResponse implements IResponse {
+	private string $subject;
+	private ?String $expires = null;
+
+	/** @var string[] */
+	private array $aliases = [];
+
+	/** @var (string|null)[] */
+	private array $properties = [];
+
+	/** @var mixed[] */
+	private array $links = [];
+
+	/**
+	 * @param string $subject https://tools.ietf.org/html/rfc7033#section-4.4.1
+	 *
+	 * @since 21.0.0
+	 */
+	public function __construct(string $subject) {
+		$this->subject = $subject;
+	}
+
+	/**
+	 * @param string $expires
+	 *
+	 * @return $this
+	 *
+	 * @since 21.0.0
+	 */
+	public function setExpires(string $expires): self {
+		$this->expires = $expires;
+
+		return $this;
+	}
+
+	/**
+	 * Add an alias
+	 *
+	 * @ref https://tools.ietf.org/html/rfc7033#section-4.4.2
+	 *
+	 * @param string $alias
+	 *
+	 * @return $this
+	 *
+	 * @since 21.0.0
+	 */
+	public function addAlias(string $alias): self {
+		$this->aliases[] = $alias;
+
+		return $this;
+	}
+
+	/**
+	 * Add a property
+	 *
+	 * @ref https://tools.ietf.org/html/rfc7033#section-4.4.3
+	 *
+	 * @param string $property
+	 * @param string|null $value
+	 *
+	 * @return $this
+	 *
+	 * @since 21.0.0
+	 */
+	public function addProperty(string $property, ?string $value): self {
+		$this->properties[$property] = $value;
+
+		return $this;
+	}
+
+	/**
+	 * Add a link
+	 *
+	 * @ref https://tools.ietf.org/html/rfc7033#section-8.4
+	 *
+	 * @param string $rel https://tools.ietf.org/html/rfc7033#section-4.4.4.1
+	 * @param string|null $type https://tools.ietf.org/html/rfc7033#section-4.4.4.2
+	 * @param string|null $href https://tools.ietf.org/html/rfc7033#section-4.4.4.3
+	 * @param string[]|null $titles https://tools.ietf.org/html/rfc7033#section-4.4.4.4
+	 * @param string[]|null $properties https://tools.ietf.org/html/rfc7033#section-4.4.4.5
+	 * @param string[] $entries
+	 *
+	 * @psalm-param array<string,(string|null)>|null $properties https://tools.ietf.org/html/rfc7033#section-4.4.4.5
+	 *
+	 * @return JrdResponse
+	 * @since 21.0.0
+	 */
+	public function addLink(string $rel,
+							?string $type,
+							?string $href,
+							?array $titles = [],
+							?array $properties = [],
+							array $entries = []
+	): self {
+		$this->links[] = array_filter(
+			array_merge(
+				[
+					'rel' => $rel,
+					'type' => $type,
+					'href' => $href,
+					'titles' => $titles,
+					'properties' => $properties
+				],
+				$entries
+			)
+		);
+
+		return $this;
+	}
+
+	/**
+	 * @since 21.0.0
+	 */
+	public function toHttpResponse(): Response {
+		return new JSONResponse(array_filter([
+			'subject' => $this->subject,
+			'expires' => $this->expires,
+			'aliases' => $this->aliases,
+			'properties' => $this->properties,
+			'links' => $this->links,
+		]));
+	}
+
+	/**
+	 * Does this response have any data attached to it?
+	 *
+	 * @since 21.0.0
+	 */
+	public function isEmpty(): bool {
+		return $this->expires === null
+			&& empty($this->aliases)
+			&& empty(this->properties)
+			&& empty($this->links);
+	}
+}

lib/WellKnown/WebfingerHandler.php

@@ -33,7 +33,6 @@
 use OCP\Http\WellKnown\IHandler;
 use OCP\Http\WellKnown\IRequestContext;
 use OCP\Http\WellKnown\IResponse;
-use OCP\Http\WellKnown\JrdResponse;
 use OCP\IURLGenerator;
 
 class WebfingerHandler implements IHandler {
@@ -90,9 +89,15 @@ public function handle(string $service, IRequestContext $context, ?IResponse $pr
 		$response->addLink('http://webfinger.net/rel/profile-page', 'text/html', $profilePageUrl);
 
 		// Ostatus subscribe url
-		// JrdResponse doesn't support template
-		// $subscribe = $this->urlGenerator->linkToRouteAbsolute('social.OStatus.subscribe') . '?uri={uri}';
-		// $response->addLink('http://ostatus.org/schema/1.0/subscribe', $subscribe);
+		$subscribe = $this->urlGenerator->linkToRouteAbsolute('social.OStatus.subscribe') . '?uri={uri}';
+		$response->addLink(
+			'http://ostatus.org/schema/1.0/subscribe',
+			'',
+			'',
+			null,
+			null,
+			['template' => $subscribe]
+		);
 
 		return $response;
 	}