umputun / tg-spam / 17341729857
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Add duplicate message detection for spam filtering (#315)

* Add duplicate message detection for spam filtering

Implement duplicate message detection to identify spam from users
sending the same message repeatedly. Uses LRU cache with 10K user
limit to prevent memory exhaustion and O(1) hash-based tracking.

Features:
- Configurable threshold for number of duplicates to trigger spam
- Time window for tracking duplicate messages
- Automatic cleanup of expired entries
- Thread-safe implementation with mutex protection
- LRU eviction when user limit is reached

Configuration:
- --duplicates.threshold: number of identical messages (default: 0, disabled)
- --duplicates.window: time window for detection (default: 1h)

Includes comprehensive tests for functionality, concurrency, and edge cases.

* fix(duplicate-detection): resolve race condition and add memory protection

- fix critical race condition in concurrent message tracking by adding mutex protection
- add maxEntriesPerUser limit (200) to prevent memory exhaustion attacks
- ensure atomic Get-Modify-Set operations for user history updates
- add comprehensive tests for race condition and memory protection
- verified with Go race detector - no races detected

* refactor: clean up duplicate detection implementation

- remove unnecessary validation from main.go for consistency with other checkers
- move duplicateDetector field next to other checker fields in Detector struct
- let detector handle edge cases gracefully without fatal exits
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