StopSpam

StopSpam is a Minecraft Paper 1.21.11 plugin that prevents chat spam by implementing message cooldowns, rate limiting, similarity detection, and escalating timeout punishments for repeat offenders.

Installation

1. Download the latest release here.
2. Place the .jar file in your Minecraft server's plugins folder.
3. Restart your server.

Configuration

In config.yml, you can configure:

# Minimum time (in milliseconds) between messages
message-cooldown: 280

# Rate limit - prevents sending too many messages in a short time
rate-limit:
  enabled: true
  # Maximum number of messages allowed within the time window
  max-messages: 9
  # Time window in seconds
  time-window: 5

# Message similarity detection
similarity:
  enabled: true
  # Threshold (0.0-1.0) - higher means more similar messages will be blocked
  # 0.85 means 85% similar content will trigger spam detection
  threshold: 0.85
  # Number of recent messages to check for similarity
  recent-messages-to-check: 15
  # Only check messages within this time window (in seconds)
  time-window: 80
  # Number of similar messages required before triggering spam detection
  repetition-threshold: 4

# Warning message shown to spammers
warning-messages:
  - "Silence is a virtue"
  - "Even a fool who keeps silent is considered wise."
  - "Speak only if it improves upon the silence."
  - "Brevity is the soul of wit."
  - "Wise men speak because they have something to say; fools speak because they have to say something."
  - "If you have nothing to say, say nothing."
  - "The more you say, the less people remember."
  - "You must be the other cat."

# Timeout durations (in seconds) for repeated violations
timeouts:
  first: 10
  second: 20
  third: 30
  fourth: 100
  fifth: 300
  sixth: 600
  seventh: 1200
  eighth: 1800

Configuration Options Explained

Message Cooldown

• message-cooldown: The minimum time (in milliseconds) allowed between player messages. Default: 280ms.

Rate Limiting

• rate-limit.enabled: Enable/disable rate limiting.
• rate-limit.max-messages: Maximum number of messages allowed within the time window.
• rate-limit.time-window: Time window in seconds to count messages.

Similarity Detection

• similarity.enabled: Enable/disable message similarity detection.
• similarity.threshold: How similar messages need to be to trigger spam detection (0.0-1.0). Higher values are more lenient.
• similarity.recent-messages-to-check: Number of recent messages to compare against.
• similarity.time-window: Only check messages within this time window (in seconds).
• similarity.repetition-threshold: Number of similar messages required before triggering spam detection.

Timeout System

Timeout durations escalate with repeated violations. By default this ranges from 10 seconds to 30 minutes.

Commands

/stopspam reload: Reloads the plugin configuration (requires stopspam.admin permission)

Permissions

stopspam.admin: Allows reloading the plugin configuration (default: op)

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