APIGuard is a specialized API gateway and protection layer for the Czech National Corpus (CNC). It acts as a proxy between clients and various linguistic data backends, providing security, authentication, rate limiting, and caching capabilities.

It is an essential component of word profile aggregator WaG, where it collects data from multiple backends and streams them to the portal page using server-sent events.

• Backend Proxying: Routes requests to various CNC linguistic services (Kontext, Treq, MQuery, and dictionary services)
• Security & Protection: Guards against abuse with IP-based blocking, rate limiting, and session validation
• Caching: Improves performance with multi-backend caching support (Redis, file-based)
• Monitoring: Tracks usage patterns and detects anomalous behavior
• Authentication: Manages CNC user sessions and token-based API access
• Data streaming: collect data from different backends and stream them via an EventStream.

make build

# Start the gateway service
./apiguard start

# Check status
./apiguard status

# Generate authentication token
./apiguard generate-token