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| pragma solidity >=0.4.21 <0.7.0; | |
| contract approvalContract{ | |
| mapping(uint => Transaction) public transactions; | |
| mapping(uint => Campaign) public campaigns; | |
| uint public transactionCount = 0; | |
| uint public campaignCount = 0; | |
| address public approver; | |
| struct Campaign { | |
| uint _id; | |
| string _name; | |
| string _description; | |
| address payable _address; | |
| uint _goal; | |
| uint _received; | |
| } | |
| struct Transaction { | |
| uint _id; | |
| uint _campaignId; | |
| address payable _sender; | |
| address payable _receiver; | |
| string _senderName; | |
| string _campaignName; | |
| uint _amount; | |
| bool _approved; | |
| } | |
| modifier isValidAmountRequired(uint _amount) { | |
| require(_amount > 0); | |
| _; | |
| } | |
| modifier hasPositiveAmount() { | |
| require(msg.value > 0); | |
| _; | |
| } | |
| modifier goalNotReached(uint _campaignId) { | |
| Campaign memory _campaign = campaigns[_campaignId]; | |
| require(_campaign._goal > _campaign._received); | |
| _; | |
| } | |
| modifier sentByApprover() { | |
| require(msg.sender == approver); | |
| _; | |
| } | |
| modifier isValidId(uint _id) { | |
| require(_id>0); | |
| _; | |
| } | |
| modifier isNotApproved(uint _id) { | |
| require(transactions[_id]._approved == false); | |
| _; | |
| } | |
| constructor() public { | |
| approver = msg.sender; | |
| } | |
| function incrementTransactionCount() internal { | |
| transactionCount++; | |
| } | |
| function incrementCampaignCount() internal { | |
| campaignCount++; | |
| } | |
| function addCampaign(uint _amount, string calldata _name, string calldata _description) external isValidAmountRequired(_amount) { | |
| incrementCampaignCount(); | |
| campaigns[campaignCount] = Campaign(campaignCount, _name, _description, msg.sender, _amount * (10 ** 18), 0); | |
| } | |
| function deposit(uint _campaignId, string calldata _senderName) external payable hasPositiveAmount goalNotReached(_campaignId) { | |
| Campaign memory _campaign = campaigns[_campaignId]; | |
| uint _remaining = _campaign._goal - _campaign._received; | |
| uint _transactionAmount = msg.value; | |
| if(_transactionAmount > _remaining) { | |
| msg.sender.transfer(_transactionAmount - _remaining); | |
| _transactionAmount = _remaining; | |
| } | |
| incrementTransactionCount(); | |
| transactions[transactionCount] = Transaction(transactionCount, _campaignId, msg.sender, _campaign._address, _senderName, _campaign._name, _transactionAmount, false); | |
| campaigns[_campaignId]._received += _transactionAmount; | |
| } | |
| function approve(uint _id) external sentByApprover isValidId(_id) isNotApproved(_id){ | |
| Transaction memory _transaction = transactions[_id]; | |
| _transaction._receiver.transfer(_transaction._amount); | |
| transactions[_id]._approved = true; | |
| } | |
| } |
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