なんかもうめっちゃ変えた

packages/backend/src/server/WellKnownServerService.ts

@@ -0,0 +1,168 @@
+import { Inject, Injectable } from '@nestjs/common';
+import Router from '@koa/router';
+import { IsNull, MoreThan } from 'typeorm';
+import { DI } from '@/di-symbols.js';
+import { UsersRepository } from '@/models/index.js';
+import { Config } from '@/config.js';
+import { escapeAttribute, escapeValue } from '@/misc/prelude/xml.js';
+import type { User } from '@/models/entities/User.js';
+import * as Acct from '@/misc/acct.js';
+import { NodeinfoServerService } from './NodeinfoServerService.js';
+import type { FindOptionsWhere } from 'typeorm';
+
+@Injectable()
+export class WellKnownServerService {
+	constructor(
+		@Inject(DI.config)
+		private config: Config,
+
+		@Inject(DI.usersRepository)
+		private usersRepository: UsersRepository,
+
+		private nodeinfoServerService: NodeinfoServerService,
+	) {
+	}
+
+	public createRouter() {
+		const router = new Router();
+
+		const XRD = (...x: { element: string, value?: string, attributes?: Record<string, string> }[]) =>
+			`<?xml version="1.0" encoding="UTF-8"?><XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">${x.map(({ element, value, attributes }) =>
+				`<${
+					Object.entries(typeof attributes === 'object' && attributes || {}).reduce((a, [k, v]) => `${a} ${k}="${escapeAttribute(v)}"`, element)
+				}${
+					typeof value === 'string' ? `>${escapeValue(value)}</${element}` : '/'
+				}>`).reduce((a, c) => a + c, '')}</XRD>`;
+
+		const allPath = '/.well-known/(.*)';
+		const webFingerPath = '/.well-known/webfinger';
+		const jrd = 'application/jrd+json';
+		const xrd = 'application/xrd+xml';
+
+		router.use(allPath, async (ctx, next) => {
+			ctx.set({
+				'Access-Control-Allow-Headers': 'Accept',
+				'Access-Control-Allow-Methods': 'GET, OPTIONS',
+				'Access-Control-Allow-Origin': '*',
+				'Access-Control-Expose-Headers': 'Vary',
+			});
+			await next();
+		});
+
+		router.options(allPath, async ctx => {
+			ctx.status = 204;
+		});
+
+		router.get('/.well-known/host-meta', async ctx => {
+			ctx.set('Content-Type', xrd);
+			ctx.body = XRD({ element: 'Link', attributes: {
+				rel: 'lrdd',
+				type: xrd,
+				template: `${this.config.url}${webFingerPath}?resource={uri}`,
+			} });
+		});
+
+		router.get('/.well-known/host-meta.json', async ctx => {
+			ctx.set('Content-Type', jrd);
+			ctx.body = {
+				links: [{
+					rel: 'lrdd',
+					type: jrd,
+					template: `${this.config.url}${webFingerPath}?resource={uri}`,
+				}],
+			};
+		});
+
+		router.get('/.well-known/nodeinfo', async ctx => {
+			ctx.body = { links: this.nodeinfoServerService.getLinks() };
+		});
+
+		/* TODO
+router.get('/.well-known/change-password', async ctx => {
+});
+*/
+
+		router.get(webFingerPath, async ctx => {
+			const fromId = (id: User['id']): FindOptionsWhere<User> => ({
+				id,
+				host: IsNull(),
+				isSuspended: false,
+			});
+
+			const generateQuery = (resource: string): FindOptionsWhere<User> | number =>
+				resource.startsWith(`${this.config.url.toLowerCase()}/users/`) ?
+					fromId(resource.split('/').pop()!) :
+					fromAcct(Acct.parse(
+						resource.startsWith(`${this.config.url.toLowerCase()}/@`) ? resource.split('/').pop()! :
+						resource.startsWith('acct:') ? resource.slice('acct:'.length) :
+						resource));
+
+			const fromAcct = (acct: Acct.Acct): FindOptionsWhere<User> | number =>
+				!acct.host || acct.host === this.config.host.toLowerCase() ? {
+					usernameLower: acct.username,
+					host: IsNull(),
+					isSuspended: false,
+				} : 422;
+
+			if (typeof ctx.query.resource !== 'string') {
+				ctx.status = 400;
+				return;
+			}
+
+			const query = generateQuery(ctx.query.resource.toLowerCase());
+
+			if (typeof query === 'number') {
+				ctx.status = query;
+				return;
+			}
+
+			const user = await this.usersRepository.findOneBy(query);
+
+			if (user == null) {
+				ctx.status = 404;
+				return;
+			}
+
+			const subject = `acct:${user.username}@${this.config.host}`;
+			const self = {
+				rel: 'self',
+				type: 'application/activity+json',
+				href: `${this.config.url}/users/${user.id}`,
+			};
+			const profilePage = {
+				rel: 'http://webfinger.net/rel/profile-page',
+				type: 'text/html',
+				href: `${this.config.url}/@${user.username}`,
+			};
+			const subscribe = {
+				rel: 'http://ostatus.org/schema/1.0/subscribe',
+				template: `${this.config.url}/authorize-follow?acct={uri}`,
+			};
+
+			if (ctx.accepts(jrd, xrd) === xrd) {
+				ctx.body = XRD(
+					{ element: 'Subject', value: subject },
+					{ element: 'Link', attributes: self },
+					{ element: 'Link', attributes: profilePage },
+					{ element: 'Link', attributes: subscribe });
+				ctx.type = xrd;
+			} else {
+				ctx.body = {
+					subject,
+					links: [self, profilePage, subscribe],
+				};
+				ctx.type = jrd;
+			}
+
+			ctx.vary('Accept');
+			ctx.set('Cache-Control', 'public, max-age=180');
+		});
+
+		// Return 404 for other .well-known
+		router.all(allPath, async ctx => {
+			ctx.status = 404;
+		});
+
+		return router;
+	}
+}