Fix: can't recognize rebirthed instance user (#3046)

* resync uri from WebFinger

* trigger resync on user page

* allways update on resync

* Revert "trigger resync on user page"

This reverts commit 8ff139fb49ee61ad55e4b42c562f8a2c3f8098ac.

* background resync

1 files changed, 58 insertions, 11 deletions

diff --git a/src/remote/resolve-user.ts b/src/remote/resolve-user.ts
index 15401557f5..ed259774bd 100644
--- a/src/remote/resolve-user.ts
+++ b/src/remote/resolve-user.ts
@@ -1,13 +1,18 @@
 import { toUnicode, toASCII } from 'punycode';
-import User, { IUser } from '../models/user';
+import User, { IUser, IRemoteUser } from '../models/user';
 import webFinger from './webfinger';
 import config from '../config';
-import { createPerson } from './activitypub/models/person';
+import { createPerson, updatePerson } from './activitypub/models/person';
+import { URL } from 'url';
+import * as debug from 'debug';
 
-export default async (username: string, _host: string, option?: any): Promise<IUser> => {
+const log = debug('misskey:remote:resolve-user');
+
+export default async (username: string, _host: string, option?: any, resync?: boolean): Promise<IUser> => {
 	const usernameLower = username.toLowerCase();
 
 	if (_host == null) {
+		log(`return local user: ${usernameLower}`);
 		return await User.findOne({ usernameLower, host: null });
 	}
 
@@ -15,22 +20,64 @@ export default async (username: string, _host: string, option?: any): Promise<IU
 	const host = toUnicode(hostAscii);
 
 	if (config.host == host) {
+		log(`return local user: ${usernameLower}`);
 		return await User.findOne({ usernameLower, host: null });
 	}
 
-	let user = await User.findOne({ usernameLower, host }, option);
+	const user = await User.findOne({ usernameLower, host }, option);
+
+	const acctLower = `${usernameLower}@${hostAscii}`;
 
 	if (user === null) {
-		const acctLower = `${usernameLower}@${hostAscii}`;
+		const self = await resolveSelf(acctLower);
+
+		log(`return new remote user: ${acctLower}`);
+		return await createPerson(self.href);
+	}
+
+	if (resync) {
+		log(`try resync: ${acctLower}`);
+		const self = await resolveSelf(acctLower);
+
+		if ((user as IRemoteUser).uri !== self.href) {
+			// if uri mismatch, Fix (user@host <=> AP's Person id(IRemoteUser.uri)) mapping.
+			log(`uri missmatch: ${acctLower}`);
+			console.log(`recovery missmatch uri for (username=${username}, host=${host}) from ${(user as IRemoteUser).uri} to ${self.href}`);
 
-		const finger = await webFinger(acctLower);
-		const self = finger.links.find(link => link.rel && link.rel.toLowerCase() === 'self');
-		if (!self) {
-			throw new Error('self link not found');
+			// validate uri
+			const uri = new URL(self.href);
+			if (uri.hostname !== hostAscii) {
+				throw new Error(`Invalied uri`);
+			}
+
+			await User.update({
+				usernameLower,
+				host: host
+			 }, {
+				$set: {
+					uri: self.href
+				}
+			});
+		} else {
+			log(`uri is fine: ${acctLower}`);
 		}
 
-		user = await createPerson(self.href);
-	}
+		await updatePerson(self.href);
+
+		log(`return resynced remote user: ${acctLower}`);
+		return await User.findOne({ uri: self.href });
+}
 
+	log(`return existing remote user: ${acctLower}`);
 	return user;
 };
+
+async function resolveSelf(acctLower: string) {
+	log(`WebFinger for ${acctLower}`);
+	const finger = await webFinger(acctLower);
+	const self = finger.links.find(link => link.rel && link.rel.toLowerCase() === 'self');
+	if (!self) {
+		throw new Error('self link not found');
+	}
+	return self;
+}