misskey/packages/backend/src/server/web/feed.ts

import { Feed } from 'feed';
import config from '@/config/index';
import { User } from '@/models/entities/user';
import { Notes, DriveFiles, UserProfiles } from '@/models/index';
import { In } from 'typeorm';

export default async function(user: User) {
	const author = {
		link: `${config.url}/@${user.username}`,
		name: user.name || user.username
	};

	const profile = await UserProfiles.findOneOrFail(user.id);

	const notes = await Notes.find({
		where: {
			userId: user.id,
			renoteId: null,
			visibility: In(['public', 'home'])
		},
		order: { createdAt: -1 },
		take: 20
	});

	const feed = new Feed({
		id: author.link,
		title: `${author.name} (@${user.username}@${config.host})`,
		updated: notes[0].createdAt,
		generator: 'Misskey',
		description: `${user.notesCount} Notes, ${profile.ffVisibility === 'public' ? user.followingCount : '?'} Following, ${profile.ffVisibility === 'public' ? user.followersCount : '?'} Followers${profile.description ? ` · ${profile.description}` : ''}`,
		link: author.link,
		image: user.avatarUrl ? user.avatarUrl : undefined,
		feedLinks: {
			json: `${author.link}.json`,
			atom: `${author.link}.atom`,
		},
		author,
		copyright: user.name || user.username
	});

	for (const note of notes) {
		const files = note.fileIds.length > 0 ? await DriveFiles.find({
			id: In(note.fileIds)
		}) : [];
		const file = files.find(file => file.type.startsWith('image/'));

		feed.addItem({
			title: `New note by ${author.name}`,
			link: `${config.url}/notes/${note.id}`,
			date: note.createdAt,
			description: note.cw || undefined,
			content: note.text || undefined,
			image: file ? DriveFiles.getPublicUrl(file) || undefined : undefined
		});
	}

	return feed;
}