Fix bug

src/queue/processors/http/process-inbox.ts

 import * as kue from 'kue';
 import * as debug from 'debug';
 
-import { verifySignature } from 'http-signature';
+const httpSignature = require('http-signature');
 import parseAcct from '../../../acct/parse';
 import User, { IRemoteUser } from '../../../models/user';
 import perform from '../../../remote/activitypub/perform';
@@ -50,7 +50,7 @@ export default async (job: kue.Job, done): Promise<void> => {
 		return;
 	}
 
-	if (!verifySignature(signature, user.publicKey.publicKeyPem)) {
+	if (!httpSignature.verifySignature(signature, user.publicKey.publicKeyPem)) {
 		console.warn('signature verification failed');
 		done();
 		return;

src/server/activitypub.ts

 import * as Router from 'koa-router';
 const koaBody = require('koa-body');
-const parseRequest = require('http-signature');
+const httpSignature = require('http-signature');
 
 import { createHttp } from '../queue';
 import pack from '../remote/activitypub/renderer';
@@ -25,7 +25,7 @@ router.post('/users/:user/inbox', koaBody(), ctx => {
 	ctx.req.headers.authorization = 'Signature ' + ctx.req.headers.signature;
 
 	try {
-		signature = parseRequest(ctx.req);
+		signature = httpSignature.parseRequest(ctx.req);
 	} catch (e) {
 		ctx.status = 401;
 		return;