From 09c3c35c3302f1134cb404a2b7aad2aa7eb3792b Mon Sep 17 00:00:00 2001
From: s-ol <s-ol@users.noreply.github.com>
Date: Sat, 6 Feb 2021 12:46:13 +0100
Subject: Mastodon semi-compatibility

---
 src/cors-proxy.js |  12 +++++++
 src/index.js      | 105 +++++++++++++++++++++++++++++++++++++++++++++---------
 src/layout.js     |   2 ++
 src/ui/Note.js    |  11 ++++--
 4 files changed, 110 insertions(+), 20 deletions(-)
 create mode 100644 src/cors-proxy.js

(limited to 'src')

diff --git a/src/cors-proxy.js b/src/cors-proxy.js
new file mode 100644
index 0000000..905eb0f
--- /dev/null
+++ b/src/cors-proxy.js
@@ -0,0 +1,12 @@
+var host = process.env.HOST || '127.0.0.1';
+var port = process.env.PORT || 8088;
+ 
+var cors_proxy = require('cors-anywhere');
+cors_proxy.createServer({
+    originWhitelist: [], // Allow all origins
+    requireHeader: ['origin', 'x-requested-with'],
+    removeHeaders: ['cookie', 'cookie2'],
+    checkRateLimit: null,
+}).listen(port, host, function() {
+    console.log('Running CORS Anywhere on ' + host + ':' + port);
+});
diff --git a/src/index.js b/src/index.js
index b749a53..1169307 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,3 +1,4 @@
+import 'preact/debug';
 import 'core-js/stable';
 import 'regenerator-runtime/runtime';
 import * as jsonld from 'jsonld';
@@ -12,26 +13,98 @@ const context = [
 	},
 ];
 
+function wrapCache(target) {
+	const orig = target.descriptor.value;
+
+	target.descriptor.value = function (id, ...args) {
+		this.cache[id] ||= orig.call(this, id, ...args);
+		return this.cache[id];
+	};
+
+	return target;
+};
+
 class GraphContainer extends Component {
 	state = {
 		name: "loading…",
-		items: [],
+		items: {},
 	};
 
-	usersCache = {};
+	cache = {};
 
 	constructor(props) {
 		super(props);
 
-		this.loadData(this.props.graph)
-			.catch(err => console.error(err));
+		if (this.props.graph.startsWith('http'))
+			this.loadDataMastodon(this.props.graph)
+					.catch(err => console.error(err));
+		else
+			this.loadData(this.props.graph)
+				.catch(err => console.error(err));
 	}
 
-	async loadData(url) {
-		// temporary hack
-		if (url.startsWith('http'))
-			url = `https://cors-anywhere.herokuapp.com/${url}`;
+	@wrapCache
+	async loadCollection(id, ...args) {
+		const collection = await jsonld.compact(`http://localhost:8088/${id}`, context);
+		let items = [];
+
+		const addItems = (i) => {
+			if (Array.isArray(i))
+				items = items.concat(i);
+			else if (i)
+				items.push(i);
+		};
+
+		// discover items
+		if (collection.items) {
+			addItems(collection.items);
+		} else {
+			let page = collection.first;
+			const seen = [];
+			while (seen.indexOf(page.id) < 0) {
+				seen.push(page.id);
+				addItems(page.items);
+
+				page = await jsonld.compact(`http://localhost:8088/${page.next}`, context);
+			}
+		}
+
+		// dereference items
+		return await Promise.all(items.map(item => this.loadNote(item.id ?? item, ...args)));
+	}
+
+	@wrapCache
+	async loadNote(id, items) {
+		const item = await jsonld.frame(
+			`http://localhost:8088/${id}`,
+			{
+				'@context': context,
+				type: 'Note',
+				context: { '@embed': '@never' },
+				replies: { '@embed': '@always' },
+				inReplyTo: { '@embed': '@never' },
+			},
+			{ omitGraph: true }
+		);
+
+		item.attributedTo = await this.loadUser(item.attributedTo);
+		item.replies = await this.loadCollection(item.replies[0].id, items);
+
+		items[id] = item;
+		return item;
+	}
+
+	async loadDataMastodon(url) {
+		const items = {};
+		const root = await this.loadNote(url, items);
 
+		this.setState({
+			name: root.name || root.content,
+			items,
+		});
+	}
+
+	async loadData(url) {
 		const response = await fetch(url, {
 			headers: {
 				'Accept': 'application/json',
@@ -63,18 +136,15 @@ class GraphContainer extends Component {
 		this.setState(discussion);
 	}
 
+	@wrapCache
 	async loadUser(id) {
-		if (!this.usersCache[id]) {
-			this.usersCache[id] = jsonld.compact(id, context).then((user) => {
-				user.id = id;
-				return user;
-			});
-		}
-
-		return await this.usersCache[id];
+		const user = await jsonld.compact(id, context);
+		user.id = id;
+		return user;
 	}
 
 	render() {
+		window.s = this.state;
 		return this.props.render(this.state);
 	}
 }
@@ -114,7 +184,8 @@ class CollapseContainer extends Component {
 	}
 }
 
-const graph = document.location.hash ? document.location.hash.substr(1) : 'lib/graph.json';
+const search = new URLSearchParams(window.location.search);
+const graph = search.has('graph') ? search.get('graph') : 'lib/graph.json';
 const app = (
 	<GraphContainer graph={graph} render={({ name, items }) => (
 		<CollapseContainer
diff --git a/src/layout.js b/src/layout.js
index 000d22c..c9c2a4d 100644
--- a/src/layout.js
+++ b/src/layout.js
@@ -20,6 +20,8 @@ export default class Layout {
 		this.src += '}';
 
 		const info = await gv.renderJSONObject(this.src, { format: 'json0' });
+		info.objects ||= [];
+		info.edges ||= [];
 		const [width, height] = info.bb.split(',').map(toNumber).slice(2);
 
 		const positions = {};
diff --git a/src/ui/Note.js b/src/ui/Note.js
index 34c15d7..6bdec04 100644
--- a/src/ui/Note.js
+++ b/src/ui/Note.js
@@ -103,6 +103,13 @@ section > main {
 	font-family: serif;
 }
 
+section > main > p:first-child {
+	margin-top: 0;
+}
+section > main > p:last-child {
+	margin-bottom: 0;
+}
+
 section.tombstone > main {
 	font-family: inherit;
 }
@@ -153,9 +160,7 @@ export const Note = ({
 				? <header className="small" onClick={onClickHeader} />
 				: <Header onClick={onClickHeader} user={attributedTo} published={published} />
 			}
-			<main>
-				{content}
-			</main>
+			<main innerHTML={content} />
 		</section>
 	);
 };
-- 
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