[UST-196] [Contract] Check if reputation is negative and the epoch last claimed proof < 1 day

[chentihe]

Is your feature request related to a problem? Please describe.
目前還沒有機制去防止用戶一天只能 check in 一次，也沒有檢查用戶 reputation 是否為 negative

Describe the solution you'd like

• 將 epoch key proof 改為 daily claim proof，claimDailyLoginRep 裡，除了驗證 epoch key 以外，還需要驗證 reputation < 0 與 用戶當天是否有領取reputation
• 新增一個 daily epoch data 用來記錄以天為單位的 epoch 作為防止用戶重複領取每日簽到獎勵

contract UnirepApp is Ownable {
	struct DailyEpochData {
		uint48 startTimestamp; // setup while deploying
		uint48 currentEpoch;
		uint48 epochLength; // 60 * 60 * 24
	}

	DailyEpochData dailyEpochData;

    function _updateDailyEpochIfNeeded(
        uint256 attesterId
    ) public returns (uint epoch) {
        // 可參考 https://github.com/Unirep/Unirep/blob/36e5adf8c1eaa7398716ff3653327d5bd98181b3/packages/contracts/contracts/Unirep.sol#L406
    }

    function dailyCurrentEpoch() public view returns (uint48) {
        uint48 timestamp = dailyEpochData.startTimestamp;
        uint48 epochLength = dailyEpochData.epochLength;
        return (uint48(block.timestamp) - timestamp) / epochLength;
    }

    function claimDailyLoginRep(
        uint256[] calldata publicSignals,
        uint256[8] calldata proof <-- daily claim proof
    ) public onlyOwner() {
        _updateDailyEpochIfNeeded();
        
        // TODO: 需要將publicSignals轉換成 DailyClaimSignals
        DailyClaimVerifierHelper.DailyClaimSignals
            memory signals = dailyClaimHelper.decodeEpochKeySignals(
                publicSignals
            );
		    // TODO: check signals.dailyEpoch == dailyEpochData.currentEpoch;
		    
        // check if proof is used before
        bytes32 nullifier = signals.dailyNullifier;
        if (proofNullifier[nullifier]) {
            revert ProofHasUsed();
        }

        proofNullifier[nullifier] = true;

        // check the epoch != current epoch (ppl can only post in current aepoch)
        uint48 epoch = unirep.attesterCurrentEpoch(signals.attesterId);
        if (signals.epoch > epoch) {
            revert InvalidEpoch();
        }

        dailyClaimHelper.verifyAndCheckCaller(publicSignals, proof);
        
        require(signals.minRep - signals.maxRep < 0, "bad boy");

        // attesting on Unirep contract:
        unirep.attest(
            signals.epochKey,
            epoch,
            posRepFieldIndex, // field index: posRep
            1
        );

        emit ClaimPosRep(
            signals.epochKey,
            epoch
        );
    }
}

• 新增一個dailyClaimProofHelper將public signals轉換成DailyClaimVerifierHelper.DailyClaimSignals
  可參考https://github.com/social-tw/social-tw-website/tree/main/packages/contracts/contracts/verifierHelpers
• 更新ClaimDailyLoginRep.test.ts測試
  • 通過測試
    • reputation < 0 且 daily epoch 為當天的 epoch
  • 失敗測試
    • reputation > 0
    • daily epoch 不為當天的 epoch
    • 用戶在同一個daily epoch重複領取每日簽到獎勵(nullifier相同)

[cc03668]

@chentihe 記得要 tag 對應的 issue