[core] Add event.timestamp

fix #755

src/core/abc/manager.abc.ts

@@ -218,11 +218,14 @@ export function populateSessionInfo(
 ) {
   return (payload: any): WAHAWebhook => {
     const id = payload._eventId;
+    const timestampMs = payload._timestampMs;
     const data = { ...payload };
     delete data._eventId;
+    delete data._timestampMs;
     const me = session.getSessionMeInfo();
     return {
       id: id,
+      timestamp: timestampMs,
       event: event,
       session: session.name,
       metadata: session.sessionConfig?.metadata,

src/core/abc/session.abc.ts

@@ -178,6 +178,7 @@ export abstract class WhatsappSession {
             filter(Boolean),
             map((data) => {
               data._eventId = generatePrefixedId('evt');
+              data._timestampMs = Date.now();
               return data;
             }),
             retry(),

src/core/integrations/webhooks/WebhookSender.ts

@@ -66,7 +66,7 @@ export class WebhookSender {
     const headers = {
       'content-type': 'application/json',
     };
-    Object.assign(headers, this.getWebhookHeader());
+    Object.assign(headers, this.getWebhookHeader(json));
     Object.assign(headers, this.getHMACHeaders(body));
     const ctx = {
       id: headers['X-Webhook-Request-Id'],
@@ -153,12 +153,13 @@ export class WebhookSender {
     };
   }
 
-  protected getWebhookHeader() {
+  protected getWebhookHeader(json: any) {
+    const timestamp = json.timestamp?.toString() || Date.now().toString();
     return {
       // UUID, no '-' in it
       'X-Webhook-Request-Id': ulid(),
       // unix timestamp with ms
-      'X-Webhook-Timestamp': Date.now().toString(),
+      'X-Webhook-Timestamp': timestamp,
     };
   }
 

src/structures/webhooks.dto.ts

@@ -105,10 +105,18 @@ export class WASessionStatusBody {
 
 export class WAHAWebhook {
   @ApiProperty({
-    example: 'evt_01jcn4pjwwg47bwy2gsey6q5sx',
+    example: 'evt_01aaaaaaaaaaaaaaaaaaaaaaaa',
+    description:
+      'Unique identifier for the event - lower case ULID format. https://github.com/ulid/spec',
   })
   id: string;
 
+  @ApiProperty({
+    example: 1634567890123,
+    description: 'Unix timestamp (ms) for when the event was created.',
+  })
+  timestamp: number;
+
   @ApiProperty({
     example: 'default',
   })