refactoring

Resolve #7779

packages/backend/src/server/activitypub/following.ts

@@ -0,0 +1,103 @@
+import * as Router from '@koa/router';
+import config from '@/config/index';
+import $ from 'cafy';
+import { ID } from '@/misc/cafy-id';
+import * as url from '@/prelude/url';
+import { renderActivity } from '@/remote/activitypub/renderer/index';
+import renderOrderedCollection from '@/remote/activitypub/renderer/ordered-collection';
+import renderOrderedCollectionPage from '@/remote/activitypub/renderer/ordered-collection-page';
+import renderFollowUser from '@/remote/activitypub/renderer/follow-user';
+import { setResponseType } from '../activitypub';
+import { Users, Followings, UserProfiles } from '@/models/index';
+import { LessThan, FindConditions } from 'typeorm';
+import { Following } from '@/models/entities/following';
+
+export default async (ctx: Router.RouterContext) => {
+	const userId = ctx.params.user;
+
+	// Get 'cursor' parameter
+	const [cursor, cursorErr] = $.optional.type(ID).get(ctx.request.query.cursor);
+
+	// Get 'page' parameter
+	const pageErr = !$.optional.str.or(['true', 'false']).ok(ctx.request.query.page);
+	const page: boolean = ctx.request.query.page === 'true';
+
+	// Validate parameters
+	if (cursorErr || pageErr) {
+		ctx.status = 400;
+		return;
+	}
+
+	// Verify user
+	const user = await Users.findOne({
+		id: userId,
+		host: null
+	});
+
+	if (user == null) {
+		ctx.status = 404;
+		return;
+	}
+
+	//#region Check ff visibility
+	const profile = await UserProfiles.findOneOrFail(user.id);
+
+	if (profile.ffVisibility === 'private') {
+		ctx.status = 403;
+		ctx.set('Cache-Control', 'public, max-age=30');
+		return;
+	} else if (profile.ffVisibility === 'followers') {
+		ctx.status = 403;
+		ctx.set('Cache-Control', 'public, max-age=30');
+		return;
+	}
+	//#endregion
+
+	const limit = 10;
+	const partOf = `${config.url}/users/${userId}/following`;
+
+	if (page) {
+		const query = {
+			followerId: user.id
+		} as FindConditions<Following>;
+
+		// カーソルが指定されている場合
+		if (cursor) {
+			query.id = LessThan(cursor);
+		}
+
+		// Get followings
+		const followings = await Followings.find({
+			where: query,
+			take: limit + 1,
+			order: { id: -1 }
+		});
+
+		// 「次のページ」があるかどうか
+		const inStock = followings.length === limit + 1;
+		if (inStock) followings.pop();
+
+		const renderedFollowees = await Promise.all(followings.map(following => renderFollowUser(following.followeeId)));
+		const rendered = renderOrderedCollectionPage(
+			`${partOf}?${url.query({
+				page: 'true',
+				cursor
+			})}`,
+			user.followingCount, renderedFollowees, partOf,
+			undefined,
+			inStock ? `${partOf}?${url.query({
+				page: 'true',
+				cursor: followings[followings.length - 1].id
+			})}` : undefined
+		);
+
+		ctx.body = renderActivity(rendered);
+		setResponseType(ctx);
+	} else {
+		// index page
+		const rendered = renderOrderedCollection(partOf, user.followingCount, `${partOf}?page=true`);
+		ctx.body = renderActivity(rendered);
+		ctx.set('Cache-Control', 'public, max-age=180');
+		setResponseType(ctx);
+	}
+};