Remove Vault support; fix OpenID Connect client delete issue

app/unit/OpenIDConnectUnit.js

@@ -1,3 +1,4 @@
+const fs = require('fs')
 const Unit = require('libflitter/Unit')
 const { Provider, interactionPolicy: { Prompt, base: policy } } = require('oidc-provider')
 const uuid = require('uuid').v4
@@ -14,6 +15,15 @@ class OpenIDConnectUnit extends Unit {
         return [...super.services, 'output', 'configs', 'models']
     }
 
+    load_jwks(file) {
+        if ( fs.existsSync(file) ) {
+            const content = fs.readFileSync(file)
+            try {
+                return JSON.parse(content)
+            } catch (e) {}
+        }
+    }
+
     async go(app) {
         this.Vue = this.app.di().get('Vue')
         const issuer = this.configs.get('app.url')
@@ -23,9 +33,13 @@ class OpenIDConnectUnit extends Unit {
 
         CoreIDAdapter.connect(app)
 
+        const jwks_file = this.configs.get('oidc.jwks_file')
+        const jwks = this.load_jwks(jwks_file)
+
         this.provider = new Provider(issuer, {
             adapter: CoreIDAdapter,
             clients: [],
+            jwks,
             interactions: {
                 interactions,
                 url: (ctx, interaction) => `/openid/interaction/${ctx.oidc.uid.toLowerCase()}`,