adjust MFM to HTML conversion

Removed the misc/get-note-html module which was only used in one place.
Instead of it, the general MFM to HTML functionality has been improved to
take care of the use cases of that module as well.

Co-authored-by: Francis Dinh <normandy@biribiri.dev>

packages/backend/src/mfm/to-html.ts

@@ -1,17 +1,29 @@
 import { JSDOM } from 'jsdom';
 import * as mfm from 'mfm-js';
 import config from '@/config/index.js';
+import { UserProfiles } from '@/models/index.js';
+import { extractMentions } from '@/misc/extract-mentions.js';
 import { intersperse } from '@/prelude/array.js';
-import { IMentionedRemoteUsers } from '@/models/entities/note.js';
 
-export function toHtml(nodes: mfm.MfmNode[] | null, mentionedRemoteUsers: IMentionedRemoteUsers = []) {
+// Transforms MFM to HTML, given the MFM text and a list of user IDs that are
+// mentioned in the text. If the list of mentions is not given, all mentions
+// from the text will be extracted.
+export async function toHtml(mfmText: string, mentions?: string[]): string | null {
+	const nodes = mfm.parse(mfmText);
 	if (nodes == null) {
 		return null;
 	}
 
-	const { window } = new JSDOM('');
+	const mentionedUsers = await UserProfiles.createQueryBuilder("user_profiles")
+		.leftJoin('user_profile.user', 'user')
+		.select('user.username')
+		.addSelect('user.host')
+		// links should preferably use user friendly urls, only fall back to AP ids
+		.addSelect('COALESCE(user_profile.url, user.uri)', 'url')
+		.where('userId IN (:...ids)', { ids: mentions ?? extractMentions(nodes) })
+		.getManyRaw();
 
-	const doc = window.document;
+	const doc = new JSDOM('').window.document;
 
 	function appendChildren(children: mfm.MfmNode[], targetElement: any): void {
 		if (children) {
@@ -106,11 +118,12 @@ export function toHtml(nodes: mfm.MfmNode[] | null, mentionedRemoteUsers: IMenti
 		},
 
 		mention(node) {
+			const { username, host, acct } = node.props;
+			const userInfo = mentionedUsers.find(user => user.username === username && user.host === host);
+			if (userInfo != null) {
 				// Mastodon microformat: span.h-card > a.u-url.mention
 				const a = doc.createElement('a');
-			const { username, host, acct } = node.props;
+				a.href = userInfo.url ?? `${config.url}/${acct}`;
-			const remoteUserInfo = mentionedRemoteUsers.find(remoteUser => remoteUser.username === username && remoteUser.host === host);
-			a.href = remoteUserInfo?.url ?? remoteUserInfo?.uri ?? `${config.url}/${acct}`;
 				a.className = 'u-url mention';
 				a.textContent = acct;
 
@@ -118,6 +131,10 @@ export function toHtml(nodes: mfm.MfmNode[] | null, mentionedRemoteUsers: IMenti
 				card.className = 'h-card';
 				card.appendChild(a);
 				return card;
+			} else {
+				// this user does not actually exist
+				return doc.createTextNode(acct);
+			}
 		},
 
 		quote(node) {

packages/backend/src/remote/activitypub/misc/get-note-html.ts

@@ -1,8 +0,0 @@
-import * as mfm from 'mfm-js';
-import { Note } from '@/models/entities/note.js';
-import { toHtml } from '../../../mfm/to-html.js';
-
-export default function(note: Note) {
-	if (!note.text) return '';
-	return toHtml(mfm.parse(note.text), JSON.parse(note.mentionedRemoteUsers));
-}

packages/backend/src/remote/activitypub/renderer/note.ts

@@ -5,7 +5,7 @@ import { DriveFile } from '@/models/entities/drive-file.js';
 import { DriveFiles, Notes, Users, Emojis, Polls } from '@/models/index.js';
 import { Emoji } from '@/models/entities/emoji.js';
 import { Poll } from '@/models/entities/poll.js';
-import toHtml from '../misc/get-note-html.js';
+import { toHtml } from '@/mfm/to-html.js';
 import renderEmoji from './emoji.js';
 import renderMention from './mention.js';
 import renderHashtag from './hashtag.js';
@@ -97,9 +97,7 @@ export default async function renderNote(note: Note, dive = true, isTalk = false
 
 	const summary = note.cw === '' ? String.fromCharCode(0x200B) : note.cw;
 
-	const content = toHtml(Object.assign({}, note, {
+	const content = await toHtml(apText, note.mentions);
-		text: apText,
-	}));
 
 	const emojis = await getEmojis(note.emojis);
 	const apemojis = emojis.map(emoji => renderEmoji(emoji));
@@ -112,7 +110,7 @@ export default async function renderNote(note: Note, dive = true, isTalk = false
 
 	const asPoll = poll ? {
 		type: 'Question',
-		content: toHtml(Object.assign({}, note, { text })),
+		content: await toHtml(text, note.mentions),
 		[poll.expiresAt && poll.expiresAt < new Date() ? 'closed' : 'endTime']: poll.expiresAt,
 		[poll.multiple ? 'anyOf' : 'oneOf']: poll.choices.map((text, i) => ({
 			type: 'Note',

packages/backend/src/remote/activitypub/renderer/person.ts

@@ -1,5 +1,4 @@
 import { URL } from 'node:url';
-import * as mfm from 'mfm-js';
 import config from '@/config/index.js';
 import { ILocalUser } from '@/models/entities/user.js';
 import { toHtml } from '@/mfm/to-html.js';
@@ -66,7 +65,7 @@ export async function renderPerson(user: ILocalUser) {
 		url: `${config.url}/@${user.username}`,
 		preferredUsername: user.username,
 		name: user.name,
-		summary: profile.description ? toHtml(mfm.parse(profile.description)) : null,
+		summary: profile.description ? await toHtml(profile.description) : null,
 		icon: avatar ? renderImage(avatar) : null,
 		image: banner ? renderImage(banner) : null,
 		tag,