From 089a0ad8e8c780e5c088b1c528aa95c5827cbdcc Mon Sep 17 00:00:00 2001
From: Kagami Sascha Rosylight <saschanaz@outlook.com>
Date: Thu, 20 Jul 2023 08:36:26 +0200
Subject: [PATCH] feat: support `<link rel=alternate
 type=application/activitypub+json>` (#10)

* feat: support `<link rel=alternate type=application/activitypub+json>`

* Update index.ts

* build
---
 built/general.js            |  2 ++
 built/plugins/amazon.js     |  1 +
 built/plugins/wikipedia.js  |  1 +
 built/summary.d.ts          |  4 ++++
 src/general.ts              |  4 ++++
 src/plugins/amazon.ts       |  1 +
 src/plugins/wikipedia.ts    |  1 +
 src/summary.ts              |  5 +++++
 test/htmls/activitypub.html |  3 +++
 test/index.ts               | 24 ++++++++++++++++++++++++
 10 files changed, 46 insertions(+)
 create mode 100644 test/htmls/activitypub.html

diff --git a/built/general.js b/built/general.js
index 193a0e88..206b62dc 100644
--- a/built/general.js
+++ b/built/general.js
@@ -165,6 +165,7 @@ export default async (_url, lang = null) => {
     const favicon = $('link[rel="shortcut icon"]').attr('href') ||
         $('link[rel="icon"]').attr('href') ||
         '/favicon.ico';
+    const activityPub = $('link[rel="alternate"][type="application/activitypub+json"]').attr('href') || null;
     const sensitive = $('.tweet').attr('data-possibly-sensitive') === 'true';
     const find = async (path) => {
         const target = new URL(path, url.href);
@@ -201,5 +202,6 @@ export default async (_url, lang = null) => {
         },
         sitename: siteName || null,
         sensitive,
+        activityPub,
     };
 };
diff --git a/built/plugins/amazon.js b/built/plugins/amazon.js
index 08796d45..87ceb79d 100644
--- a/built/plugins/amazon.js
+++ b/built/plugins/amazon.js
@@ -40,5 +40,6 @@ export async function summarize(url) {
             allow: playerUrl ? ['fullscreen', 'encrypted-media'] : [],
         },
         sitename: 'Amazon',
+        activityPub: null,
     };
 }
diff --git a/built/plugins/wikipedia.js b/built/plugins/wikipedia.js
index 4c85dfde..51800f95 100644
--- a/built/plugins/wikipedia.js
+++ b/built/plugins/wikipedia.js
@@ -33,5 +33,6 @@ export async function summarize(url) {
             allow: [],
         },
         sitename: 'Wikipedia',
+        activityPub: null,
     };
 }
diff --git a/built/summary.d.ts b/built/summary.d.ts
index 7a93ca70..27bf2bf2 100644
--- a/built/summary.d.ts
+++ b/built/summary.d.ts
@@ -27,6 +27,10 @@ declare type Summary = {
      * Possibly sensitive
      */
     sensitive?: boolean;
+    /**
+     * The url of the ActivityPub representation of that web page
+     */
+    activityPub: string | null;
 };
 export default Summary;
 export declare type Player = {
diff --git a/src/general.ts b/src/general.ts
index 81569a14..cd3f4e01 100644
--- a/src/general.ts
+++ b/src/general.ts
@@ -203,6 +203,9 @@ export default async (_url: URL | string, lang: string | null = null): Promise<S
 		$('link[rel="icon"]').attr('href') ||
 		'/favicon.ico';
 
+	const activityPub =
+		$('link[rel="alternate"][type="application/activitypub+json"]').attr('href') || null;
+
 	const sensitive = $('.tweet').attr('data-possibly-sensitive') === 'true'
 
 	const find = async (path: string) => {
@@ -244,5 +247,6 @@ export default async (_url: URL | string, lang: string | null = null): Promise<S
 		},
 		sitename: siteName || null,
 		sensitive,
+		activityPub,
 	};
 };
diff --git a/src/plugins/amazon.ts b/src/plugins/amazon.ts
index 5f10d5d8..5e71061d 100644
--- a/src/plugins/amazon.ts
+++ b/src/plugins/amazon.ts
@@ -55,5 +55,6 @@ export async function summarize(url: URL): Promise<summary> {
 			allow: playerUrl ? ['fullscreen', 'encrypted-media'] : [],
 		},
 		sitename: 'Amazon',
+		activityPub: null,
 	};
 }
diff --git a/src/plugins/wikipedia.ts b/src/plugins/wikipedia.ts
index 9249dacc..28c5115d 100644
--- a/src/plugins/wikipedia.ts
+++ b/src/plugins/wikipedia.ts
@@ -42,5 +42,6 @@ export async function summarize(url: URL): Promise<summary> {
 			allow: [],
 		},
 		sitename: 'Wikipedia',
+		activityPub: null,
 	};
 }
diff --git a/src/summary.ts b/src/summary.ts
index cc580cc7..30c07f59 100644
--- a/src/summary.ts
+++ b/src/summary.ts
@@ -33,6 +33,11 @@ type Summary = {
 	 * Possibly sensitive
 	 */
 	sensitive?: boolean;
+
+	/**
+	 * The url of the ActivityPub representation of that web page
+	 */
+	activityPub: string | null;
 };
 
 export default Summary;
diff --git a/test/htmls/activitypub.html b/test/htmls/activitypub.html
new file mode 100644
index 00000000..dc88c5f5
--- /dev/null
+++ b/test/htmls/activitypub.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="alternate" type="application/activitypub+json" href="https://misskey.test/notes/abcdefg">
diff --git a/test/index.ts b/test/index.ts
index af86185b..73aa552a 100644
--- a/test/index.ts
+++ b/test/index.ts
@@ -369,3 +369,27 @@ describe("oEmbed", () => {
 		expect(summary.player.height).toBe(300);
 	});
 });
+
+describe('ActivityPub', () => {
+	test('Basic', async () => {
+		app = fastify();
+		app.get('*', (request, reply) => {
+			return reply.send(fs.createReadStream(_dirname + '/htmls/activitypub.html'));
+		});
+		await app.listen({ port });
+
+		const summary = await summaly(host);
+		expect(summary.activityPub).toBe('https://misskey.test/notes/abcdefg');
+	});
+
+	test('Null', async () => {
+		app = fastify();
+		app.get('*', (request, reply) => {
+			return reply.send(fs.createReadStream(_dirname + '/htmls/basic.html'));
+		});
+		await app.listen({ port });
+
+		const summary = await summaly(host);
+		expect(summary.activityPub).toBe(null);
+	});
+});