Improve error handling in OAuth2 token issuer

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@extollo/lib",
-  "version": "0.9.42",
+  "version": "0.9.43",
   "description": "The framework library that lifts up your code.",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",

src/auth/server/repositories/ORMTokenRepository.ts

@@ -1,6 +1,6 @@
 import {isOAuth2Token, OAuth2Client, OAuth2Token, oauth2TokenString, OAuth2TokenString, TokenRepository} from '../types'
 import {Inject, Injectable} from '../../../di'
-import {Maybe} from '../../../util'
+import {ErrorWithContext, Maybe} from '../../../util'
 import {OAuth2TokenModel} from '../models/OAuth2TokenModel'
 import {Config} from '../../../service/Config'
 import * as jwt from 'jsonwebtoken'
@@ -52,8 +52,11 @@ export class ORMTokenRepository extends TokenRepository {
 
         const generated = await new Promise<string>((res, rej) => {
             jwt.sign(payload, secret, {}, (err, gen) => {
-                if (err || err === null || !gen) {
-                    rej(err || new Error('Unable to encode JWT.'))
+                if (err || !gen) {
+                    rej(err || new ErrorWithContext('Unable to encode JWT.', {
+                        payload,
+                        gen,
+                    }))
                 } else {
                     res(gen)
                 }