refactor link verification.

packages/backend/src/misc/verify-field-link.ts

@@ -0,0 +1,32 @@
+/*
+* SPDX-FileCopyrightText: piuvas and other Sharkey contributors
+* SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+import { JSDOM } from 'jsdom';
+import { HttpRequestService } from '@/core/HttpRequestService.js';
+import { safeForSql } from './safe-for-sql.js';
+
+
+export async function verifyFieldLink(field_url: string, profile_url: string, httpRequestService: HttpRequestService): Promise<boolean | undefined> {
+	if (!safeForSql(field_url)) return;
+
+	try {
+		const html = await httpRequestService.getHtml(field_url);
+
+		const { window } = new JSDOM(html);
+		const doc: Document = window.document;
+
+		const aEls = Array.from(doc.getElementsByTagName('a'));
+		const linkEls = Array.from(doc.getElementsByTagName('link'));
+
+		const includesProfileLinks = [...aEls, ...linkEls].some(link => link.rel === 'me' && link.href === profile_url);
+
+		window.close();
+
+		return includesProfileLinks;
+	} catch (err) {
+		// なにもしない
+		return;
+	}
+}