From 7f44df42e73bc83c0694139cc57af73a7ed740f7 Mon Sep 17 00:00:00 2001
From: Sebastian Seedorf <sebastian.seedorf@biotronik.com>
Date: Thu, 19 Nov 2020 20:31:17 +0100
Subject: [PATCH] Cache user info until expire

---
 out/auth-proxy.js | 13 ++++++++++++-
 src/auth-proxy.ts | 13 ++++++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/out/auth-proxy.js b/out/auth-proxy.js
index 4045013..dbbdb8c 100644
--- a/out/auth-proxy.js
+++ b/out/auth-proxy.js
@@ -12,19 +12,30 @@ Object.defineProperty(exports, "__esModule", { value: true });
 exports.AuthProxy = void 0;
 const _1 = require(".");
 const node_fetch_1 = require("node-fetch");
+const cachedUsers = {};
 const router = (req, res, next) => {
     const resolvable = new _1.Resolvable(() => __awaiter(void 0, void 0, void 0, function* () {
         if (!_1.DefaultConfig.USERINFO_HEADER) {
             return undefined;
         }
         const token = req.header(_1.DefaultConfig.USERINFO_HEADER);
+        if (token && cachedUsers[token])
+            return cachedUsers[token];
         const url = _1.DefaultConfig.AUTH_PROXY_USERINFO_URL;
         if (token === undefined || url === undefined) {
             return undefined;
         }
         try {
+            const expireHeader = req.header(_1.DefaultConfig.EXPIRE_HEADER);
+            const expireSecDate = expireHeader && parseInt(expireHeader, 10) || undefined;
+            const expiresIn = expireSecDate && expireSecDate * 1000 > Date.now() && expireSecDate * 1000 - Date.now();
             const res = yield node_fetch_1.default(url, { headers: [[_1.DefaultConfig.USERINFO_HEADER, token]] });
-            return yield res.json();
+            const userinfo = yield res.json();
+            if (expiresIn) {
+                cachedUsers[token] = userinfo;
+                setTimeout(() => delete cachedUsers[token], expiresIn);
+            }
+            return userinfo;
         }
         catch (e) {
             _1.Logger.warn(e);
diff --git a/src/auth-proxy.ts b/src/auth-proxy.ts
index 117a633..7d9bfc9 100644
--- a/src/auth-proxy.ts
+++ b/src/auth-proxy.ts
@@ -2,19 +2,30 @@ import {Request, RequestHandler} from 'express';
 import {DefaultConfig, Logger, Resolvable, UserInfo} from '.';
 import fetch from 'node-fetch';
 
+const cachedUsers: {[token: string]: UserInfo} = {};
+
 const router: RequestHandler = (req: Request, res, next) => {
 	const resolvable = new Resolvable(async () => {
 		if (!DefaultConfig.USERINFO_HEADER) {
 			return undefined;
 		}
 		const token = req.header(DefaultConfig.USERINFO_HEADER);
+		if (token && cachedUsers[token]) return cachedUsers[token];
 		const url = DefaultConfig.AUTH_PROXY_USERINFO_URL;
 		if (token === undefined || url === undefined) {
 			return undefined;
 		}
 		try {
+			const expireHeader = req.header(DefaultConfig.EXPIRE_HEADER);
+			const expireSecDate = expireHeader && parseInt(expireHeader, 10) || undefined;
+			const expiresIn = expireSecDate && expireSecDate * 1000 > Date.now() && expireSecDate * 1000 - Date.now();
 			const res = await fetch(url, {headers: [[DefaultConfig.USERINFO_HEADER, token]]});
-			return await res.json() as UserInfo;
+			const userinfo = await res.json() as UserInfo;
+			if (expiresIn) {
+				cachedUsers[token] = userinfo;
+				setTimeout(() => delete cachedUsers[token], expiresIn);
+			}
+			return userinfo;
 		} catch (e) {
 			Logger.warn(e);
 			return undefined;