Cherry-picked from PR #2365 by @xerpert.
Three bugs preventing Signal image attachments from being processed:
1. signal-cli getAttachment RPC expects 'id', not 'attachmentId'
2. signal-cli daemon returns dict {"data": "base64..."} not raw base64
3. MessageType.IMAGE doesn't exist — correct enum is MessageType.PHOTO
Support Signal 'Note to Self' messages in single-number setups where
signal-cli is linked as a secondary device on the user's own account.
syncMessage.sentMessage envelopes addressed to the bot's own account
are now promoted to dataMessage for normal processing, while other
sync events (read receipts, typing, etc.) are still filtered.
Echo-back prevention mirrors the WhatsApp bridge pattern:
- Track timestamps of recently sent messages (bounded set of 50)
- When a Note to Self sync arrives, check if its timestamp matches
a recent outbound — skip if so (agent echo-back)
- Only process sync messages that are genuinely user-initiated
Based on PR #2115 by @Stonelinks with added echo-back protection.
Signal's send() used 'text' instead of 'content' and 'reply_to_message_id'
instead of 'reply_to', mismatching BasePlatformAdapter.send(). Callers in
gateway/run.py use keyword args matching the base interface, so Signal's
send() was missing its required 'text' positional arg.
Fixes: 'SignalAdapter.send() missing 1 required positional argument: text'
_keep_typing() was called with metadata= for thread-aware typing
indicators, but neither it nor the base send_typing() accepted
that parameter. Most adapter overrides (Slack, Discord, Telegram,
WhatsApp, HA) already accept metadata=None, but the base class
and Signal adapter did not.
- Add metadata=None to BasePlatformAdapter.send_typing()
- Add metadata=None to BasePlatformAdapter._keep_typing(), pass through
- Add metadata=None to SignalAdapter.send_typing()
Fixes TypeError in _process_message_background for Signal.
The Signal adapter was passing image_paths, audio_path, and document_paths
to MessageEvent.__init__(), but those fields don't exist on the dataclass.
MessageEvent uses media_urls (List[str]) and media_types (List[str]).
Changes:
- Replace separate image_paths/audio_path/document_paths with unified
media_urls and media_types lists (matching Discord, Slack, etc.)
- Add _ext_to_mime() helper to map file extensions to MIME types
- Use Signal's contentType from attachment metadata when available,
falling back to extension-based mapping
- Update message type detection to check media_types prefixes
Fixes TypeError: MessageEvent.__init__() got an unexpected keyword
argument 'image_paths'
Complete Signal adapter using signal-cli daemon HTTP API.
Based on PR #268 by ibhagwan, rebuilt on current main with bug fixes.
Architecture:
- SSE streaming for inbound messages with exponential backoff (2s→60s)
- JSON-RPC 2.0 for outbound (send, typing, attachments, contacts)
- Health monitor detects stale SSE connections (120s threshold)
- Phone number redaction in all logs and global redact.py
Features:
- DM and group message support with separate access policies
- DM policies: pairing (default), allowlist, open
- Group policies: disabled (default), allowlist, open
- Attachment download with magic-byte type detection
- Typing indicators (8s refresh interval)
- 100MB attachment size limit, 8000 char message limit
- E.164 phone + UUID allowlist support
Integration:
- Platform.SIGNAL enum in gateway/config.py
- Signal in _is_user_authorized() allowlist maps (gateway/run.py)
- Adapter factory in _create_adapter() (gateway/run.py)
- user_id_alt/chat_id_alt fields in SessionSource for UUIDs
- send_message tool support via httpx JSON-RPC (not aiohttp)
- Interactive setup wizard in 'hermes gateway setup'
- Connectivity testing during setup (pings /api/v1/check)
- signal-cli detection and install guidance
Bug fixes from PR #268:
- Timestamp reads from envelope_data (not outer wrapper)
- Uses httpx consistently (not aiohttp in send_message tool)
- SIGNAL_DEBUG scoped to signal logger (not root)
- extract_images regex NOT modified (preserves group numbering)
- pairing.py NOT modified (no cross-platform side effects)
- No dual authorization (adapter defers to run.py for user auth)
- Wildcard uses set membership ('*' in set, not list equality)
- .zip default for PK magic bytes (not .docx)
No new Python dependencies — uses httpx (already core).
External requirement: signal-cli daemon (user-installed).
Tests: 30 new tests covering config, init, helpers, session source,
phone redaction, authorization, and send_message integration.
Co-authored-by: ibhagwan <ibhagwan@users.noreply.github.com>
