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Implement rate limiting to prevent spam #5

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Merged
DeborahOlaboye merged 1 commit into from
Nov 16, 2025
Merged

Implement rate limiting to prevent spam #5

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13 changes: 13 additions & 0 deletions src/AmbienceChat.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,12 @@ contract AmbienceChat {
/// @dev Counter for generating unique room IDs
uint256 private roomIdCounter;

/// @dev Time (in seconds) a user must wait between sending messages
uint256 public constant MESSAGE_COOLDOWN = 1 minutes;

/// @dev Mapping to track the last message timestamp for each address
mapping(address => uint256) public lastMessageTime;

/// @dev Mapping from message ID to Message struct
mapping(uint256 => Message) public messages;

Expand Down Expand Up @@ -294,6 +300,13 @@ contract AmbienceChat {
function sendMessage(uint256 roomId, string calldata content) external canAccessRoom(roomId) returns (uint256) {
require(bytes(content).length > 0, "Message cannot be empty");
require(bytes(content).length <= 1000, "Message too long");
require(
block.timestamp >= lastMessageTime[msg.sender] + MESSAGE_COOLDOWN,
"Cooldown period not met. Please wait before sending another message."
);

// Update the last message time for this sender
lastMessageTime[msg.sender] = block.timestamp;

uint256 messageId = messageIdCounter++;

Expand Down