Deduplicate audit entries

packages/tabler-world-common/package.json

@@ -12,7 +12,8 @@
     "license": "Copyright 2019-present Markus Kling",
     "dependencies": {},
     "devDependencies": {
+        "@types/lodash": "^4.14.149",
         "@types/node": "^14.6.0",
         "typescript": "4.0.2"
     }
-}
+}

packages/tabler-world-common/src/Audit.ts

@@ -1,3 +1,4 @@
+import { values } from 'lodash';
 import { format } from 'util';
 
 export type AuditEntry = {
@@ -18,7 +19,7 @@ export enum AuditAction {
 }
 
 export class Audit {
-    entries: InternalAuditEntry[] = [];
+    entries: { [key: string]: InternalAuditEntry } = {};
 
     constructor(
         private requestId?: string,
@@ -28,22 +29,30 @@ export class Audit {
     }
 
     public async clear() {
-        this.entries = [];
+        this.entries = {};
     }
 
     public async add(entry: AuditEntry) {
-        this.entries.push({
+        const type = entry.type.replace(/ /ig, '_').toLocaleLowerCase();
+        const key = `${type}:${entry.id}`;
+
+        if (this.entries[key] != null) {
+            // we don't override the time if it has been access more than once
+            return;
+        }
+
+        this.entries[key] = {
             ...entry,
-            type: entry.type.replace(/ /ig, '_').toLocaleLowerCase(),
+            type,
             time: new Date().toISOString(),
-        });
+        };
     }
 
     /**
      * We don't want lambda to play with our log messages
      */
     public async dump() {
-        this.entries.forEach((e) => {
+        values(this.entries).forEach((e) => {
             process.stdout.write(
                 // tslint:disable-next-line: prefer-template
                 format('AUDIT', e.time, this.requestId, this.deviceId, this.principal, e.action, e.type, e.id) + '\n',