feat: adds IterableEmbeddedMessageMetadata class

Author: Evan Greer

src/embedded/classes/IterableEmbeddedMessage.ts

@@ -2,9 +2,9 @@ import { IterableEmbeddedMessageMetadata } from './IterableEmbeddedMessageMetada
 import { IterableEmbeddedMessageElements } from './IterableEmbeddedMessageElements';
 
 export class IterableEmbeddedMessage {
-  readonly metadata: IterableEmbeddedMessageMetadata;
-  readonly elements: IterableEmbeddedMessageElements;
-  readonly payload: Record<string, unknown>;
+  metadata: IterableEmbeddedMessageMetadata;
+  elements: IterableEmbeddedMessageElements;
+  payload: Record<string, unknown>;
 
   constructor(
     metadata: IterableEmbeddedMessageMetadata,

src/embedded/classes/IterableEmbeddedMessageMetadata.ts

@@ -1 +1,33 @@
-export class IterableEmbeddedMessageMetadata {}
+export class IterableEmbeddedMessageMetadata {
+  static readonly TAG = 'ItblEmbeddedMessageMetadata';
+
+  readonly messageId: string;
+  readonly placementId: number;
+  readonly campaignId?: number;
+  readonly isProof: boolean;
+
+  constructor(
+    messageId: string,
+    placementId: number,
+    campaignId: number | undefined,
+    isProof: boolean = false
+  ) {
+    this.messageId = messageId;
+    this.placementId = placementId;
+    this.campaignId = campaignId;
+    this.isProof = isProof;
+  }
+  static fromDict(dict: {
+    messageId: string;
+    placementId: number;
+    campaignId: number | undefined;
+    isProof: boolean;
+  }): IterableEmbeddedMessageMetadata {
+    return new IterableEmbeddedMessageMetadata(
+      dict.messageId,
+      dict.placementId,
+      dict.campaignId,
+      dict.isProof
+    );
+  }
+}