1 files changed, 132 insertions, 0 deletions
diff --git a/packages/backend/src/core/RemoteUserResolveService.ts b/packages/backend/src/core/RemoteUserResolveService.ts
new file mode 100644
index 0000000000..809b50f6e9
--- /dev/null
+++ b/packages/backend/src/core/RemoteUserResolveService.ts
@@ -0,0 +1,132 @@
+import { URL } from 'node:url';
+import { Inject, Injectable } from '@nestjs/common';
+import chalk from 'chalk';
+import { IsNull } from 'typeorm';
+import { DI } from '@/di-symbols.js';
+import type { UsersRepository } from '@/models/index.js';
+import type { IRemoteUser, User } from '@/models/entities/User.js';
+import type { Config } from '@/config.js';
+import type Logger from '@/logger.js';
+import { UtilityService } from '@/core/UtilityService.js';
+import { WebfingerService } from '@/core/WebfingerService.js';
+import { RemoteLoggerService } from '@/core/RemoteLoggerService.js';
+import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
+
+@Injectable()
+export class RemoteUserResolveService {
+	private logger: Logger;
+
+	constructor(
+		@Inject(DI.config)
+		private config: Config,
+
+		@Inject(DI.usersRepository)
+		private usersRepository: UsersRepository,
+
+		private utilityService: UtilityService,
+		private webfingerService: WebfingerService,
+		private remoteLoggerService: RemoteLoggerService,
+		private apPersonService: ApPersonService,
+	) {
+		this.logger = this.remoteLoggerService.logger.createSubLogger('resolve-user');
+	}
+
+	public async resolveUser(username: string, host: string | null): Promise<User> {
+		const usernameLower = username.toLowerCase();
+	
+		if (host == null) {
+			this.logger.info(`return local user: ${usernameLower}`);
+			return await this.usersRepository.findOneBy({ usernameLower, host: IsNull() }).then(u => {
+				if (u == null) {
+					throw new Error('user not found');
+				} else {
+					return u;
+				}
+			});
+		}
+	
+		host = this.utilityService.toPuny(host);
+	
+		if (this.config.host === host) {
+			this.logger.info(`return local user: ${usernameLower}`);
+			return await this.usersRepository.findOneBy({ usernameLower, host: IsNull() }).then(u => {
+				if (u == null) {
+					throw new Error('user not found');
+				} else {
+					return u;
+				}
+			});
+		}
+	
+		const user = await this.usersRepository.findOneBy({ usernameLower, host }) as IRemoteUser | null;
+	
+		const acctLower = `${usernameLower}@${host}`;
+	
+		if (user == null) {
+			const self = await this.resolveSelf(acctLower);
+	
+			this.logger.succ(`return new remote user: ${chalk.magenta(acctLower)}`);
+			return await this.apPersonService.createPerson(self.href);
+		}
+	
+		// ユーザー情報が古い場合は、WebFilgerからやりなおして返す
+		if (user.lastFetchedAt == null || Date.now() - user.lastFetchedAt.getTime() > 1000 * 60 * 60 * 24) {
+			// 繋がらないインスタンスに何回も試行するのを防ぐ, 後続の同様処理の連続試行を防ぐ ため 試行前にも更新する
+			await this.usersRepository.update(user.id, {
+				lastFetchedAt: new Date(),
+			});
+	
+			this.logger.info(`try resync: ${acctLower}`);
+			const self = await this.resolveSelf(acctLower);
+	
+			if (user.uri !== self.href) {
+				// if uri mismatch, Fix (user@host <=> AP's Person id(IRemoteUser.uri)) mapping.
+				this.logger.info(`uri missmatch: ${acctLower}`);
+				this.logger.info(`recovery missmatch uri for (username=${username}, host=${host}) from ${user.uri} to ${self.href}`);
+	
+				// validate uri
+				const uri = new URL(self.href);
+				if (uri.hostname !== host) {
+					throw new Error('Invalid uri');
+				}
+	
+				await this.usersRepository.update({
+					usernameLower,
+					host: host,
+				}, {
+					uri: self.href,
+				});
+			} else {
+				this.logger.info(`uri is fine: ${acctLower}`);
+			}
+	
+			await this.apPersonService.updatePerson(self.href);
+	
+			this.logger.info(`return resynced remote user: ${acctLower}`);
+			return await this.usersRepository.findOneBy({ uri: self.href }).then(u => {
+				if (u == null) {
+					throw new Error('user not found');
+				} else {
+					return u;
+				}
+			});
+		}
+	
+		this.logger.info(`return existing remote user: ${acctLower}`);
+		return user;
+	}
+
+	private async resolveSelf(acctLower: string) {
+		this.logger.info(`WebFinger for ${chalk.yellow(acctLower)}`);
+		const finger = await this.webfingerService.webfinger(acctLower).catch(err => {
+			this.logger.error(`Failed to WebFinger for ${chalk.yellow(acctLower)}: ${ err.statusCode ?? err.message }`);
+			throw new Error(`Failed to WebFinger for ${acctLower}: ${ err.statusCode ?? err.message }`);
+		});
+		const self = finger.links.find(link => link.rel != null && link.rel.toLowerCase() === 'self');
+		if (!self) {
+			this.logger.error(`Failed to WebFinger for ${chalk.yellow(acctLower)}: self link not found`);
+			throw new Error('self link not found');
+		}
+		return self;
+	}
+}