add ttl as abstract method so each message can define its own

ts/global.d.ts

@@ -52,6 +52,7 @@ interface Window {
   toggleSpellCheck: any;
   toggleLinkPreview: any;
   toggleMediaPermissions: any;
+  getMessageTTL: () => number;
 
   getSettingValue: any;
   setSettingValue: any;

ts/session/messages/outgoing/content/ContentMessage.ts

@@ -4,11 +4,10 @@ import { SignalService } from '../../../../protobuf';
 export abstract class ContentMessage implements Message {
   public readonly timestamp: number;
   public readonly identifier: string;
-  public readonly ttl: number;
-  constructor(timestamp: number, identifier: string, ttl: number) {
+
+  constructor(timestamp: number, identifier: string) {
     this.timestamp = timestamp;
     this.identifier = identifier;
-    this.ttl = ttl;
   }
 
   public plainTextBuffer(): Uint8Array {
@@ -17,8 +16,19 @@ export abstract class ContentMessage implements Message {
     return this.processPlainTextBuffer(encoded);
   }
 
+  public abstract ttl(): number;
   protected abstract contentProto(): SignalService.Content;
 
+  /**
+   * If the message is not a message with a specific TTL,
+   * this value can be used in all child classes
+   */
+  protected getDefaultTTL(): number {
+    // 1 day default for any other message
+    return (window.getMessageTTL() || 24) * 60 * 60 * 1000;
+
+  }
+
   private processPlainTextBuffer(buffer: Uint8Array): Uint8Array {
     const paddedMessageLength = this.getPaddedMessageLength(
       buffer.byteLength + 1

ts/session/messages/outgoing/content/DeviceLinkMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../protobuf';
 
 export class DeviceLinkMessage extends ContentMessage {
 
+  public ttl(): number {
+    return 2 * 60 * 1000; // 2 minutes for linking requests
+  }
+
   protected contentProto(): SignalService.Content {
     throw new Error('Not implemented');
   }

ts/session/messages/outgoing/content/EndSessionMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../protobuf';
 
 export class EndSessionMessage extends SessionResetMessage {
 
+  public ttl(): number {
+    return this.getDefaultTTL();
+  }
+
   protected contentProto(): SignalService.Content {
     throw new Error('Not implemented');
   }

ts/session/messages/outgoing/content/ReceiptMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../protobuf';
 
 export class ReceiptMessage extends ContentMessage {
 
+  public ttl(): number {
+    return this.getDefaultTTL();
+  }
+
   protected contentProto(): SignalService.Content {
     return new SignalService.Content({
       receiptMessage: this.receiptProto(),

ts/session/messages/outgoing/content/SessionEstablishedMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../protobuf';
 
 export class SessionEstablishedMessage extends ContentMessage {
 
+  public ttl(): number {
+    return 60 * 1000;
+  }
+
   protected contentProto(): SignalService.Content {
     throw new Error('Not implemented');
   }

ts/session/messages/outgoing/content/SessionResetMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../protobuf';
 
 export class SessionResetMessage extends ContentMessage {
 
+  public ttl(): number {
+    return this.getDefaultTTL();
+  }
+
   protected contentProto(): SignalService.Content {
     throw new Error('Not implemented');
   }

ts/session/messages/outgoing/content/TypingMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../protobuf';
 
 export abstract class TypingMessage extends ContentMessage {
 
+  public ttl(): number {
+    return 60 * 1000; // 1 minute for typing indicators
+  }
+
   protected contentProto(): SignalService.Content {
     return new SignalService.Content({
       typingMessage: this.typingProto(),
@@ -10,4 +14,5 @@ export abstract class TypingMessage extends ContentMessage {
   }
 
   protected abstract typingProto(): SignalService.TypingMessage;
+
 }

ts/session/messages/outgoing/content/data/ClosedGroupMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../../protobuf';
 
 export class ClosedGroupMessage extends DataMessage {
 
+  public ttl(): number {
+    return this.getDefaultTTL();
+  }
+
   protected dataProto(): SignalService.DataMessage {
     throw new Error('Not implemented');
   }

ts/session/messages/outgoing/content/data/DeviceUnlinkMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../../protobuf';
 
 export class DeviceUnlinkMessage extends DataMessage {
 
+  public ttl(): number {
+    return 4 * 24 * 60 * 60 * 1000; // 4 days for device unlinking
+  }
+
   protected dataProto(): SignalService.DataMessage {
     throw new Error('Not implemented');
   }

ts/session/messages/outgoing/content/data/GroupInvitationMessage.ts

@@ -3,6 +3,10 @@ import { SignalService } from '../../../../../protobuf';
 
 export class GroupInvitationMessage extends DataMessage {
 
+  public ttl(): number {
+    return this.getDefaultTTL();
+  }
+
   protected dataProto(): SignalService.DataMessage {
     throw new Error('Not implemented');
   }

ts/session/messages/outgoing/content/data/RegularMessage.ts

@@ -4,6 +4,9 @@ import { SignalService } from '../../../../../protobuf';
 // this message type is probably to sub divise again.
 // should handle quote, body, attachmentsPointer, ... @see DataMessage in compiled.d.ts
 export abstract class RegularMessage extends DataMessage {
+  public ttl(): number {
+    return this.getDefaultTTL();
+  }
 
   protected dataProto(): SignalService.DataMessage {
     throw new Error('Not implemented');

ts/session/messages/outgoing/content/sync/SyncMessage.ts

@@ -2,6 +2,9 @@ import { ContentMessage } from '../ContentMessage';
 import { SignalService } from '../../../../../protobuf';
 
 export abstract class SyncMessage extends ContentMessage {
+  public ttl(): number {
+    return this.getDefaultTTL();
+  }
 
   protected contentProto(): SignalService.Content {
     return new SignalService.Content({
@@ -10,4 +13,5 @@ export abstract class SyncMessage extends ContentMessage {
   }
 
   protected abstract syncProto(): SignalService.SyncMessage;
+
 }