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import * as Bull from 'bull';
import * as httpSignature from 'http-signature';
import perform from '../../remote/activitypub/perform';
import Logger from '../../services/logger';
import { registerOrFetchInstanceDoc } from '../../services/register-or-fetch-instance-doc';
import { Instances } from '../../models';
import { instanceChart } from '../../services/chart';
import { fetchMeta } from '../../misc/fetch-meta';
import { toPuny, extractDbHost } from '../../misc/convert-host';
import { getApId } from '../../remote/activitypub/type';
import { fetchInstanceMetadata } from '../../services/fetch-instance-metadata';
import { InboxJobData } from '..';
import DbResolver from '../../remote/activitypub/db-resolver';
import { resolvePerson } from '../../remote/activitypub/models/person';
import { LdSignature } from '../../remote/activitypub/misc/ld-signature';
const logger = new Logger('inbox');
// ユーザーのinboxにアクティビティが届いた時の処理
export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
const signature = job.data.signature; // HTTP-signature
const activity = job.data.activity;
//#region Log
const info = Object.assign({}, activity);
delete info['@context'];
logger.debug(JSON.stringify(info, null, 2));
//#endregion
const host = toPuny(new URL(signature.keyId).hostname);
// ブロックしてたら中断
const meta = await fetchMeta();
if (meta.blockedHosts.includes(host)) {
return `Blocked request: ${host}`;
}
const keyIdLower = signature.keyId.toLowerCase();
if (keyIdLower.startsWith('acct:')) {
return `Old keyId is no longer supported. ${keyIdLower}`;
}
const dbResolver = new DbResolver();
// HTTP-Signature keyIdを元にDBから取得
let authUser = await dbResolver.getAuthUserFromKeyId(signature.keyId);
// keyIdでわからなければ、activity.actorを元にDBから取得 || activity.actorを元にリモートから取得
if (authUser == null) {
try {
authUser = await dbResolver.getAuthUserFromApId(getApId(activity.actor));
} catch (e) {
// 対象が4xxならスキップ
if (e.statusCode >= 400 && e.statusCode < 500) {
return `skip: Ignored deleted actors on both ends ${activity.actor} - ${e.statusCode}`;
}
throw `Error in actor ${activity.actor} - ${e.statusCode || e}`;
}
}
// それでもわからなければ終了
if (authUser == null) {
return `skip: failed to resolve user`;
}
// HTTP-Signatureの検証
const httpSignatureValidated = httpSignature.verifySignature(signature, authUser.key.keyPem);
// また、signatureのsignerは、activity.actorと一致する必要がある
if (!httpSignatureValidated || authUser.user.uri !== activity.actor) {
// 一致しなくても、でもLD-Signatureがありそうならそっちも見る
if (activity.signature) {
if (activity.signature.type !== 'RsaSignature2017') {
return `skip: unsupported LD-signature type ${activity.signature.type}`;
}
// activity.signature.creator: https://example.oom/users/user#main-key
// みたいになっててUserを引っ張れば公開キーも入ることを期待する
if (activity.signature.creator) {
const candicate = activity.signature.creator.replace(/#.*/, '');
await resolvePerson(candicate).catch(() => null);
}
// keyIdからLD-Signatureのユーザーを取得
authUser = await dbResolver.getAuthUserFromKeyId(activity.signature.creator);
if (authUser == null) {
return `skip: LD-Signatureのユーザーが取得できませんでした`;
}
// LD-Signature検証
const ldSignature = new LdSignature();
const verified = await ldSignature.verifyRsaSignature2017(activity, authUser.key.keyPem).catch(() => false);
if (!verified) {
return `skip: LD-Signatureの検証に失敗しました`;
}
// もう一度actorチェック
if (authUser.user.uri !== activity.actor) {
return `skip: LD-Signature user(${authUser.user.uri}) !== activity.actor(${activity.actor})`;
}
// ブロックしてたら中断
const ldHost = extractDbHost(authUser.user.uri);
if (meta.blockedHosts.includes(ldHost)) {
return `Blocked request: ${ldHost}`;
}
} else {
return `skip: http-signature verification failed and no LD-Signature. keyId=${signature.keyId}`;
}
}
// activity.idがあればホストが署名者のホストであることを確認する
if (typeof activity.id === 'string') {
const signerHost = extractDbHost(authUser.user.uri!);
const activityIdHost = extractDbHost(activity.id);
if (signerHost !== activityIdHost) {
return `skip: signerHost(${signerHost}) !== activity.id host(${activityIdHost}`;
}
}
// Update stats
registerOrFetchInstanceDoc(authUser.user.host).then(i => {
Instances.update(i.id, {
latestRequestReceivedAt: new Date(),
lastCommunicatedAt: new Date(),
isNotResponding: false
});
fetchInstanceMetadata(i);
instanceChart.requestReceived(i.host);
});
// アクティビティを処理
await perform(authUser.user, activity);
return `ok`;
};
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