Merge branch 'feat/log-middleware' into develop

src/middlewares/auth.ts

@@ -7,11 +7,7 @@ import HttpStatus from "../interfaces/http-status";
 if (!process.env.AUTH_PUBLIC_KEY && !process.env.AUTH_REALM_URL) {
   throw new Error("Require keycloak AUTH_PUBLIC_KEY or AUTH_REALM_URL.");
 }
-if (
-  process.env.AUTH_PUBLIC_KEY &&
-  process.env.AUTH_REALM_URL &&
-  !process.env.AUTH_PREFERRED_MODE
-) {
+if (process.env.AUTH_PUBLIC_KEY && process.env.AUTH_REALM_URL && !process.env.AUTH_PREFERRED_MODE) {
   throw new Error(
     "AUTH_PREFFERRED must be specified if AUTH_PUBLIC_KEY and AUTH_REALM_URL is provided.",
   );
@@ -57,6 +53,9 @@ export async function expressAuthentication(
       break;
   }
 
+  request.app.locals.logData.userId = payload.sub;
+  request.app.locals.logData.user = payload.preferred_username;
+
   return payload;
 }
 

src/middlewares/logs.ts

@@ -0,0 +1,73 @@
+import { NextFunction, Request, Response } from "express";
+import { Client } from "@elastic/elasticsearch";
+
+if (!process.env.ELASTICSEARCH_INDEX) {
+  throw new Error("Require ELASTICSEARCH_INDEX to store log.");
+}
+
+const ELASTICSEARCH_INDEX = process.env.ELASTICSEARCH_INDEX;
+
+const LOG_LEVEL_MAP: Record<string, number> = {
+  debug: 4,
+  info: 3,
+  warning: 2,
+  error: 1,
+  none: 0,
+};
+
+const elasticsearch = new Client({
+  node: `${process.env.ELASTICSEARCH_PROTOCOL}://${process.env.ELASTICSEARCH_HOST}:${process.env.ELASTICSEARCH_PORT}`,
+});
+
+async function logMiddleware(req: Request, res: Response, next: NextFunction) {
+  if (!req.url.startsWith("/api/")) return next();
+
+  let data: any;
+
+  const originalJson = res.json;
+
+  res.json = function (v: any) {
+    data = v;
+    return originalJson.call(this, v);
+  };
+
+  const timestamp = new Date().toString();
+  const start = performance.now();
+
+  req.app.locals.logData = {};
+
+  res.on("finish", () => {
+    if (!req.url.startsWith("/api/")) return;
+
+    const level = LOG_LEVEL_MAP[process.env.LOG_LEVEL ?? "info"] || 1;
+
+    if (level === 1 && res.statusCode < 500) return;
+    if (level === 2 && res.statusCode < 400) return;
+    if (level === 3 && res.statusCode < 200) return;
+
+    const obj = {
+      logType: res.statusCode >= 500 ? "error" : res.statusCode >= 400 ? "warning" : "info",
+      systemName: "BMA_EHR_DEVELOPMENT",
+      startTimeStamp: timestamp,
+      endTimeStamp: new Date().toString(),
+      processTime: performance.now() - start,
+      host: req.hostname,
+      method: req.method,
+      endpoint: req.url,
+      responseCode: String(res.statusCode === 304 ? 200 : res.statusCode),
+      responseDescription: data?.code,
+      input: (level === 4 && JSON.stringify(req.body, null, 2)) || undefined,
+      output: (level === 4 && JSON.stringify(data, null, 2)) || undefined,
+      ...req.app.locals.logData,
+    };
+
+    elasticsearch.index({
+      index: ELASTICSEARCH_INDEX,
+      document: obj,
+    });
+  });
+
+  return next();
+}
+
+export default logMiddleware;