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>
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