From db907c2ff8755d1f4b511fdfc9cb12cfb6698e23 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Wed, 27 May 2020 19:05:33 +0000
Subject: [PATCH] Issue 8700: Resolvable activities

---
 src/Module/Objects.php                   | 28 ++++++++++++++++++------
 src/Protocol/ActivityPub/Transmitter.php |  4 ++--
 static/routes.config.php                 |  2 +-
 3 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/src/Module/Objects.php b/src/Module/Objects.php
index b5b5227141..b1346b5850 100644
--- a/src/Module/Objects.php
+++ b/src/Module/Objects.php
@@ -65,17 +65,31 @@ class Objects extends BaseModule
 		$last_modified = $item['changed'];
 		Network::checkEtagModified($etag, $last_modified);
 
-		$activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
-		$activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
+		if (empty($parameters['activity'])) {
+			$activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
+			$activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 
-		// Only display "Create" activity objects here, no reshares or anything else
-		if (empty($activity['object']) || ($activity['type'] != 'Create')) {
+			// Only display "Create" activity objects here, no reshares or anything else
+			if (empty($activity['object']) || ($activity['type'] != 'Create')) {
+				throw new HTTPException\NotFoundException();
+			}
+
+			$data = ['@context' => ActivityPub::CONTEXT];
+			$data = array_merge($data, $activity['object']);
+		} elseif (in_array($parameters['activity'], ['Create', 'Announce', 'Update', 
+			'Like', 'Dislike', 'Accept', 'Reject', 'TentativeAccept', 'Follow', 'Add'])) {
+			$data = ActivityPub\Transmitter::createActivityFromItem($item['id']);
+			if (empty($data)) {
+				throw new HTTPException\NotFoundException();
+			}
+			if ($parameters['activity'] != 'Create') {
+				$data['type'] = $parameters['activity'];
+				$data['id'] = str_replace('/Create', '/' . $parameters['activity'], $data['id']);
+			}
+		} else {
 			throw new HTTPException\NotFoundException();
 		}
 
-		$data = ['@context' => ActivityPub::CONTEXT];
-		$data = array_merge($data, $activity['object']);
-
 		// Relaxed CORS header for public items
 		header('Access-Control-Allow-Origin: *');
 		System::jsonExit($data, 'application/activity+json');
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index a7e4a73840..9cb5efca41 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -729,7 +729,7 @@ class Transmitter
 			$data = [];
 		}
 
-		$data['id'] = $mail['uri'] . '#Create';
+		$data['id'] = $mail['uri'] . '/Create';
 		$data['type'] = 'Create';
 		$data['actor'] = $mail['author-link'];
 		$data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
@@ -893,7 +893,7 @@ class Transmitter
 			$data = [];
 		}
 
-		$data['id'] = $item['uri'] . '#' . $type;
+		$data['id'] = $item['uri'] . '/' . $type;
 		$data['type'] = $type;
 
 		if (Item::isForumPost($item) && ($type != 'Announce')) {
diff --git a/static/routes.config.php b/static/routes.config.php
index 85ec6d8bb4..9fbe358830 100644
--- a/static/routes.config.php
+++ b/static/routes.config.php
@@ -218,7 +218,7 @@ return [
 		'/mark/all' => [Module\Notifications\Notification::class, [R::GET]],
 		'/{id:\d+}' => [Module\Notifications\Notification::class, [R::GET, R::POST]],
 	],
-	'/objects/{guid}' => [Module\Objects::class, [R::GET]],
+	'/objects/{guid}[/{activity}]' => [Module\Objects::class, [R::GET]],
 
 	'/oembed'         => [
 		'/b2h'    => [Module\Oembed::class, [R::GET]],