$ show AsamK/signal-cli
signal-cli is a command-line interface and daemon for the Signal messaging service, written in Java. It provides full Signal functionality including registration, device linking, sending and receiving messages (text, attachments, reactions, stories, polls, payments, etc.), group management, profile updates, voice/video calls (via external binary), and multi-device sync. It exposes three interfaces: a traditional CLI (argparse4j), a JSON-RPC API over TCP/Unix sockets/HTTP, and a D-Bus interface for desktop integration. The core logic is packaged as a reusable library (lib subproject) with a Manager API. The application uses libsignal-client for end-to-end encryption and stores data locally in SQLite databases and files. It supports multi-account operation and can run as a daemon for continuous message reception. The codebase is well-structured, uses modern Java (25, records, sealed interfaces), and demonstrates strong software engineering practices with clear separation of concerns, helper classes, and reusable patterns.
The LLM identified 3 files worth highlighting for reuse:
A sealed interface with two implementations (JsonWriter, PlainTextWriter) that abstracts output formatting. It is self-contained and can be extracted into any Java application needing multiple output formats (JSON/plain text). Demonstrates clean separation of output concerns.
A generic leaky bucket rate limiter implementation with a state interface. Used internally for storage sync throttling. It is self-contained and can be reused in any application requiring rate limiting without external dependencies.
A logging utility that redacts personally identifiable information (phone numbers, UUIDs, email addresses, IPs, domain names, group IDs) from log messages. It is self-contained and can be extracted into any application that needs to sanitize logs for privacy compliance.