feat: decrypt secret-encrypted message edits

[FlavioPulli]

When a phone edits a message in a @lid-addressed chat, WhatsApp delivers the edit as secretEncryptedMessage (MESSAGE_EDIT): the new content is encrypted with the message secret of the original message — a secret the whatsmeow session already holds (it arrived inside the original message). Today the encrypted event is forwarded to the webhook as-is, so consumers learn that an edit happened but not what changed.

This decrypts it with whatsmeow's official primitive (Client.DecryptSecretEncryptedMessage, native EncSecretMessageEdit support) and rewrites the event into the canonical cleartext shape (protocolMessage MESSAGE_EDIT + editedMessage) — the same shape BuildEdit produces — so webhook consumers handle phone edits and app edits identically.

Fail-open by design: if the secret is missing (message predates the pairing) the event passes through unchanged. Self-contained file plus a one-line call-site to keep review/rebase easy. Battle-tested in our production since 2026-07-21.

Summary by Sourcery

Decrypt secret-encrypted message edit events and normalize them into the standard cleartext edit shape before forwarding to webhooks.

New Features:

• Support decryption of secretEncryptedMessage MESSAGE_EDIT events using the existing whatsmeow client message secrets.
• Expose phone-originated edits to webhook consumers in the same cleartext format as application-originated edits.

Enhancements:

• Introduce a dedicated helper to resolve secret-encrypted edits while preserving fail-open behavior when decryption is not possible.

[sourcery-ai]

Reviewer's Guide

Decrypts secret-encrypted message edits from phones and rewrites them into the canonical cleartext MESSAGE_EDIT shape before forwarding to webhooks, while failing open when decryption is not possible.

Sequence diagram for decrypting secret-encrypted MESSAGE_EDIT before webhook forwarding

sequenceDiagram
  actor Phone
  participant WhatsAppServer
  participant MyClient
  participant WAClient
  participant WebhookConsumer

  Phone->>WhatsAppServer: secretEncryptedMessage MESSAGE_EDIT
  WhatsAppServer->>MyClient: events.Message (secretEncryptedMessage)
  MyClient->>MyClient: myEventHandler(rawEvt)
  MyClient->>MyClient: resolveSecretEncryptedEdit(evt)
  MyClient->>WAClient: DecryptSecretEncryptedMessage(ctx, evt)
  alt [decryption succeeds]
    WAClient-->>MyClient: decrypted waE2E.Message
    MyClient->>MyClient: rewrite evt.Message to protocolMessage MESSAGE_EDIT + editedMessage
  else [decryption fails or unsupported]
    WAClient-->>MyClient: error
    MyClient->>MyClient: leave evt.Message as secretEncryptedMessage
  end
  MyClient->>WebhookConsumer: forward Message event (cleartext when available)

Loading

File-Level Changes

Change	Details	Files
Hook message handler into a resolver that converts secret-encrypted message edits into cleartext protocolMessage edits when possible.	Invoke a new helper on each incoming message event before existing logging and processing. Ensure secret-encrypted edits are normalized so downstream webhook consumers see a standard MESSAGE_EDIT with editedMessage content.	pkg/whatsmeow/service/whatsmeow.go
Add helper to detect, decrypt, and rewrite secret-encrypted MESSAGE_EDIT events into the canonical cleartext structure, with fail-open behavior and logging.	Inspect incoming events for secretEncryptedMessage payloads of type MESSAGE_EDIT and return early when not present. Use Client.DecryptSecretEncryptedMessage to obtain the decrypted message content tied to the original message secret. On decryption failure, log a warning and leave the event untouched so webhooks still receive the encrypted payload and target message key. When the decrypted payload is already a protocolMessage MESSAGE_EDIT with editedMessage, replace evt.Message with it directly. Otherwise, construct a new waE2E.Message containing a protocolMessage of type MESSAGE_EDIT, wired to the targetMessageKey, embedding the decrypted content as editedMessage, and stamping it with the event timestamp. Log successful decryptions at info level to aid observability and debugging.	pkg/whatsmeow/service/secret_edit.go

Possibly linked issues

• #: PR decrypts secretEncryptedMessage MESSAGE_EDIT into protocolMessage+editedMessage, providing clear edited text as requested.
• #: PR decrypts secretEncryptedMessage edits and rewrites them into canonical MESSAGE_EDIT with editedMessage, exposing new text.

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="pkg/whatsmeow/service/secret_edit.go" line_range="34-35" />
<code_context>
+// failure (missing secret, unsupported type, …) the event passes through
+// untouched — behavior falls back to what it was before this change (webhook
+// receives the encrypted payload).
+func (mycli *MyClient) resolveSecretEncryptedEdit(evt *events.Message) {
+	enc := evt.Message.GetSecretEncryptedMessage()
+	if enc == nil || enc.GetSecretEncType() != waE2E.SecretEncryptedMessage_MESSAGE_EDIT {
+		return
</code_context>
<issue_to_address>
**issue (bug_risk):** Guard against a nil targetMessageKey before logging its ID

Both log lines call enc.GetTargetMessageKey().GetID() without confirming targetMessageKey is non-nil. If a payload is missing targetMessageKey, this will panic while attempting to log. Please add a nil check and either skip logging the ID or use a safe placeholder to avoid crashes on malformed inputs.
</issue_to_address>

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[sourcery-ai]

issue (bug_risk): Guard against a nil targetMessageKey before logging its ID

Both log lines call enc.GetTargetMessageKey().GetID() without confirming targetMessageKey is non-nil. If a payload is missing targetMessageKey, this will panic while attempting to log. Please add a nil check and either skip logging the ID or use a safe placeholder to avoid crashes on malformed inputs.