pragma solidity 0.6.4;

/// @title SecretRegistry
/// @notice SecretRegistry contract for registering secrets from Raiden Network
/// clients.
contract SecretRegistry {
    // sha256(secret) => block number at which the secret was revealed
    mapping(bytes32 => uint256) private secrethash_to_block;

    event SecretRevealed(bytes32 indexed secrethash, bytes32 secret);

    /// @notice Registers a hash time lock secret and saves the block number.
    /// This allows the lock to be unlocked after the expiration block
    /// @param secret The secret used to lock the hash time lock
    /// @return true if secret was registered, false if the secret was already
    /// registered
    function registerSecret(bytes32 secret) public returns (bool) {
        bytes32 secrethash = sha256(abi.encodePacked(secret));
        if (secrethash_to_block[secrethash] > 0) {
            return false;
        }
        secrethash_to_block[secrethash] = block.number;
        emit SecretRevealed(secrethash, secret);
        return true;
    }

    /// @notice Registers multiple hash time lock secrets and saves the block
    /// number
    /// @param secrets The array of secrets to be registered
    /// @return true if all secrets could be registered, false otherwise
    function registerSecretBatch(bytes32[] memory secrets) public returns (bool) {
        bool completeSuccess = true;
        for(uint i = 0; i < secrets.length; i++) {
            if(!registerSecret(secrets[i])) {
                completeSuccess = false;
            }
        }
        return completeSuccess;
    }

    /// @notice Get the stored block number at which the secret was revealed
    /// @param secrethash The hash of the registered secret `keccak256(secret)`
    /// @return The block number at which the secret was revealed
    function getSecretRevealBlockHeight(bytes32 secrethash) public view returns (uint256) {
        return secrethash_to_block[secrethash];
    }
}

// MIT License

// Copyright (c) 2018

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.