perf(backend): jsdom、happy-domをやめて軽量な実装にし、メモリ削減・高速化 (#16885)

* wip

* Update packages/backend/src/server/api/endpoints/i/update.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/FetchInstanceMetadataService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* remove some packages

* コミット漏れ

* clean up

* fix

* Update MfmService.ts

* fix

* fix

* Update MfmService.ts

* wip

* rename

* Update packages/backend/src/core/MfmService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/MfmService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/MfmService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/MfmService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/activitypub/ApRendererService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/MfmService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/MfmService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update MfmService.ts

* Update CHANGELOG.md

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index f9d904f3cd..fef6a27087 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -15,7 +15,6 @@ import fastifyStatic from '@fastify/static';
 import fastifyView from '@fastify/view';
 import fastifyProxy from '@fastify/http-proxy';
 import vary from 'vary';
-import htmlSafeJsonStringify from 'htmlescape';
 import type { Config } from '@/config.js';
 import { getNoteSummary } from '@/misc/get-note-summary.js';
 import { DI } from '@/di-symbols.js';
@@ -63,6 +62,20 @@ const frontendViteOut = `${_dirname}/../../../../../built/_frontend_vite_/`;
 const frontendEmbedViteOut = `${_dirname}/../../../../../built/_frontend_embed_vite_/`;
 const tarball = `${_dirname}/../../../../../built/tarball/`;
 
+const ESCAPE_LOOKUP = {
+	'&': '\\u0026',
+	'>': '\\u003e',
+	'<': '\\u003c',
+	'\u2028': '\\u2028',
+	'\u2029': '\\u2029',
+} as Record<string, string>;
+
+const ESCAPE_REGEX = /[&><\u2028\u2029]/g;
+
+function htmlSafeJsonStringify(obj: any): string {
+	return JSON.stringify(obj).replace(ESCAPE_REGEX, x => ESCAPE_LOOKUP[x]);
+}
+
 @Injectable()
 export class ClientServerService {
 	private logger: Logger;