<!-- Generated by sourcery-ai[bot]: start review_guide -->

[sokveasnahang-cpu]

Reviewer's Guide

Adds Typebot support for sending file/embed blocks as WhatsApp media/audio and introduces active URL scraping to reliably generate WhatsApp link previews, wiring the preview context into the Baileys send flow while preserving explicit linkPreview disabling.

Sequence diagram for WhatsApp active link preview generation

sequenceDiagram
  actor User
  participant ClientApp
  participant BaileysStartupService
  participant LinkPreviewJS
  participant WhatsAppServer

  User ->> ClientApp: Send text message with URL
  ClientApp ->> BaileysStartupService: sendMessage(sender, message, options, group)
  activate BaileysStartupService

  BaileysStartupService ->> BaileysStartupService: determine linkPreview flag
  alt linkPreview explicitly disabled
    BaileysStartupService ->> WhatsAppServer: send message without previewContext
  else linkPreview enabled or undefined
    BaileysStartupService ->> BaileysStartupService: generateLinkPreview(text)
    activate BaileysStartupService
    BaileysStartupService ->> LinkPreviewJS: getLinkPreview(url, headers)
    LinkPreviewJS -->> BaileysStartupService: previewData(title, description, images)
    BaileysStartupService ->> BaileysStartupService: build externalAdReply context
    deactivate BaileysStartupService

    BaileysStartupService ->> WhatsAppServer: send message with previewContext
  end

  WhatsAppServer -->> User: Deliver message with rich link preview

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Sequence diagram for Typebot file and embed message handling to WhatsApp

sequenceDiagram
  actor TypebotFlow
  participant TypebotService
  participant WhatsAppInstance
  participant WhatsAppServer

  TypebotFlow ->> TypebotService: Emit outgoing message
  TypebotService ->> TypebotService: Inspect message.type

  alt message.type is file or embed
    TypebotService ->> TypebotService: Extract content.url and content.name
    TypebotService ->> TypebotService: mediaType = getMediaType(mediaUrl)
    TypebotService ->> TypebotService: Derive fileName if missing

    alt mediaType is audio
      TypebotService ->> WhatsAppInstance: audioWhatsapp(number, delay, encoding, audioUrl)
    else other media type
      TypebotService ->> WhatsAppInstance: mediaMessage(number, delay, mediatype, mediaUrl, fileName)
    end

    TypebotService ->> TypebotService: sendTelemetry(/message/sendMedia)
  else other message types
    TypebotService ->> WhatsAppInstance: Existing handling for text, image, etc.
  end

  WhatsAppInstance ->> WhatsAppServer: Forward WhatsApp message
  WhatsAppServer -->> TypebotFlow: Message delivered to end user

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Updated class diagram for BaileysStartupService and TypebotService message handling

classDiagram
  class BaileysStartupService {
    +sendMessage(sender:string, message:any, options:any, group:any, previewContext:any) Promise~any~
    -generateLinkPreview(text:string) Promise~any~
  }

  class TypebotService {
    +handleTypebotMessage(instance:any, session:any, message:any, settings:any) Promise~any~
    -getMediaType(mediaUrl:string) string
  }

  TypebotService --> BaileysStartupService : uses for WhatsApp delivery

  class LinkPreviewJS {
    +getLinkPreview(url:string, options:any) Promise~any~
  }

  BaileysStartupService --> LinkPreviewJS : generates link previews using

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File-Level Changes

Change	Details	Files
Implement active link preview generation for WhatsApp text messages and inject result into sent message context.	Added generateLinkPreview helper that extracts the first URL from text, normalizes it, calls link-preview-js, and maps metadata into an externalAdReply structure while handling errors gracefully. Updated sendMessage options handling so linkPreview=false explicitly disables previews, otherwise link previews are attempted for conversation messages. Wired generated preview context into both group and direct-message send paths by passing it into sendMessage and spreading it into the outgoing message object.	src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts
Add Typebot support for file and embed message types by routing them through existing WhatsApp media/audio send helpers.	Extended TypebotService to detect file/embed message types and extract URL/name from message content, skipping send when URL is missing and emitting telemetry. Derived a best-effort filename from the URL path or media type, falling back to generic names when necessary. Routed audio media URLs through audioWhatsapp and all other media through mediaMessage with mediatype inferred from URL, and emitted a consolidated media telemetry event.	src/api/integrations/chatbot/typebot/services/typebot.service.ts
Minor formatting/indentation adjustments in BaileysStartupService.	Normalized indentation in QR code logging block. Re-indented initialization of the messagesRepository Set for readability without changing logic.	src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts

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Originally posted by @sourcery-ai in #2347 (comment)