Implement ActivityPub Followers/Following/Outbox

src/server/activitypub/outbox.ts

@@ -0,0 +1,96 @@
+import * as mongo from 'mongodb';
+import * as Koa from 'koa';
+import config from '../../config';
+import $ from 'cafy'; import ID from '../../misc/cafy-id';
+import User from '../../models/user';
+import pack from '../../remote/activitypub/renderer';
+import renderOrderedCollection from '../../remote/activitypub/renderer/ordered-collection';
+import renderOrderedCollectionPage from '../../remote/activitypub/renderer/ordered-collection-page';
+
+import Note from '../../models/note';
+import renderNote from '../../remote/activitypub/renderer/note';
+
+export default async (ctx: Koa.Context) => {
+	const userId = new mongo.ObjectID(ctx.params.user);
+
+	// Get 'sinceId' parameter
+	const [sinceId, sinceIdErr] = $.type(ID).optional.get(ctx.request.query.since_id);
+
+	// Get 'untilId' parameter
+	const [untilId, untilIdErr] = $.type(ID).optional.get(ctx.request.query.until_id);
+
+	// Get 'page' parameter
+	const pageErr = !$.str.optional.or(['true', 'false']).ok(ctx.request.query.page);
+	const page: boolean = ctx.request.query.page === 'true';
+
+	// Validate parameters
+	if (sinceIdErr || untilIdErr || pageErr || [sinceId, untilId].filter(x => x != null).length > 1) {
+		ctx.status = 400;
+		return;
+	}
+
+	// Verify user
+	const user = await User.findOne({
+		_id: userId,
+		host: null
+	});
+
+	if (user === null) {
+		ctx.status = 404;
+		return;
+	}
+
+	const limit = 20;
+	const partOf = `${config.url}/users/${userId}/outbox`;
+
+	if (page) {
+		//#region Construct query
+		const sort = {
+			_id: -1
+		};
+
+		const query = {
+			userId: user._id,
+			$or: [ { visibility: 'public' }, { visibility: 'home' } ],
+			text: { $ne: null }	// exclude renote, but include quote
+		} as any;
+
+		if (sinceId) {
+			sort._id = 1;
+			query._id = {
+				$gt: sinceId
+			};
+		} else if (untilId) {
+			query._id = {
+				$lt: untilId
+			};
+		}
+		//#endregion
+
+		// Issue query
+		const notes = await Note
+			.find(query, {
+				limit: limit,
+				sort: sort
+			});
+
+		if (sinceId) notes.reverse();
+
+		const renderedNotes = await Promise.all(notes.map(note => renderNote(note)));
+		const rendered = renderOrderedCollectionPage(
+			`${partOf}?page=true${sinceId ? `&since_id=${sinceId}` : ''}${untilId ? `&until_id=${untilId}` : ''}`,
+			user.notesCount, renderedNotes, partOf,
+			notes.length > 0 ? `${partOf}?page=true&since_id=${notes[0]._id}` : null,
+			notes.length > 0 ? `${partOf}?page=true&until_id=${notes[notes.length - 1]._id}` : null
+		);
+
+		ctx.body = pack(rendered);
+	} else {
+		// index page
+		const rendered = renderOrderedCollection(partOf, user.notesCount,
+			`${partOf}?page=true`,
+			`${partOf}?page=true&since_id=000000000000000000000000`
+		);
+		ctx.body = pack(rendered);
+	}
+};