Adding untested message tribute contract
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Richard Ramos
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4d862684ea
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pragma solidity ^0.4.17;
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import "../common/Controlled.sol";
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import "../token/MiniMeToken.sol";
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/*
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Inspired by one of Satoshi Nakamoto’s original suggested use cases for Bitcoin,
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we will be introducing an economics-based anti-spam filter, in our case for
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receiving messages and “cold” contact requests from users.
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SNT is deposited, and transferred from stakeholders to recipients upon receiving
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a reply from the recipient.
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/**
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* @title MessageTribute
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* @author Richard Ramos (Status Research & Development GmbH)
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* @dev Inspired by one of Satoshi Nakamoto’s original suggested use cases for Bitcoin,
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we will be introducing an economics-based anti-spam filter, in our case for
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receiving messages and “cold” contact requests from users.
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SNT is deposited, and transferred from stakeholders to recipients upon receiving
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a reply from the recipient.
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*/
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contract MessageTribute is Controlled {
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// Uses:
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MiniMeToken public SNT;
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/*
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// B will request 100SNT from everyone for messages
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feeCatalog[B_ADDRESS][address(0)] = 100
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*/
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/*
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// A wants to send a message to B
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// B requires that A pays 100SNT
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feeCatalog[B_ADDRESS][A_ADDRESS] = 100;
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---------------------------------------
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// A will check if B has a fee set up
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bool hasFee = feeCatalog[B_ADDRESS][address(0)] > 0 || feeCatalog[B_ADDRESS][A_ADDRESS] > 0
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if(hasFee){
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uint256 fee = feeCatalog[B_ADDRESS][address(0)];
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if(feeCatalog[B_ADDRESS][A_ADDRESS] > fee)
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fee = feeCatalog[B_ADDRESS][A_ADDRESS];
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}
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---------------------------------------
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A will pay or decide to not send the message
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---------------------------------------
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// B wants a non permanent fee for A
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// After he pays for the first message,
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// All following messages will be free
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permanentFee[B_ADDRESS][A_ADDRESS] = false;
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Then after applying fee, we should set:
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feeCatalog[B_ADDRESS][A_ADDRESS] = 0;
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---------------------------------------
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// B wants a permanent fee for A
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permanentFee[B_ADDRESS][A_ADDRESS] = true;
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*/
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contract MessageTribute {
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struct Request {
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address from;
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address to;
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uint256 timestamp;
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struct Fee {
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uint256 amount;
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bool tribute;
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bool permanent;
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}
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mapping(address => mapping(address => uint256)) feeCatalog;
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mapping(address => mapping(address => bool)) permanentFee;
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function MessageTribute() public {
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mapping(address => mapping(address => Fee)) feeCatalog;
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mapping(address => uint256) balances;
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struct Audience {
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uint256 blockNum;
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Fee fee;
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}
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mapping(address => mapping(address => Audience)) audienceRequested;
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function MessageTribute(address _SNT) public {
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SNT = MiniMeToken(_SNT);
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}
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function setRequiredTribute(address _to, uint _amount, bool _isTribute, bool _isPermanent) public {
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feeCatalog[msg.sender][_to] = Fee(_amount, _isTribute, _isPermanent);
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}
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function getRequiredFee(address _from) public view
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returns (uint256 fee, bool tribute)
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{
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Fee memory f = getFee(_from);
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fee = f.amount;
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tribute = f.tribute;
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}
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function getFee(address _from) internal
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returns (Fee)
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{
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Fee memory generalFee = feeCatalog[_from][address(0)];
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Fee memory specificFee = feeCatalog[_from][msg.sender];
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return specificFee.amount > 0 ? specificFee : generalFee;
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}
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function deposit(uint256 _value) public {
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require(_value > 0);
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balances[msg.sender] += _value;
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require(SNT.transferFrom(msg.sender, this, _value));
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}
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function balance() public view returns (uint256) {
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return balances[msg.sender];
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}
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function widthdraw(uint256 _value) public {
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require(balances[msg.sender] > 0);
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require(_value <= balances[msg.sender]);
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require(SNT.transferFrom(msg.sender, this, _value));
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}
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event AudienceRequested(address from, address to);
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event AudienceCancelled(address from, address to);
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event AudienceGranted(address from, address to, bool approve);
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function requestAudience(address _from)
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public
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{
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Fee memory f = getFee(_from);
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require(f.amount <= balances[msg.sender]);
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AudienceRequested(_from, msg.sender);
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audienceRequested[_from][msg.sender] = Audience(block.number, f);
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balances[msg.sender] -= f.amount;
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}
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function cancelAudienceRequest(address _from) public {
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if (audienceRequested[_from][msg.sender].blockNum > 0) {
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AudienceCancelled(_from, msg.sender);
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balances[msg.sender] += audienceRequested[_from][msg.sender].fee.amount;
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delete audienceRequested[_from][msg.sender];
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}
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}
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function grantAudience(address _to, bool _approve) {
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Audience memory aud = audienceRequested[msg.sender][_to];
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require(aud.blockNum > 0);
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AudienceGranted(msg.sender, _to, _approve);
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bool isTribute = aud.fee.tribute;
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uint256 amount = aud.fee.amount;
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delete audienceRequested[msg.sender][_to];
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clearFee(msg.sender, _to);
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if (isTribute) {
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if (_approve) {
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require(SNT.transferFrom(this, msg.sender, amount));
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} else {
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balances[_to] += amount;
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}
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}
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}
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function hasEnoughFundsToTalk(address _to)
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public
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view
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returns(bool)
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{
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return getFee(_to).amount <= balances[msg.sender];
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}
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function clearFee(address _from, address _to) private {
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if (!feeCatalog[_from][_to].permanent) {
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feeCatalog[_from][_to].amount = 0;
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feeCatalog[_from][_to].tribute = false;
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feeCatalog[_from][_to].permanent = false;
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}
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}
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}
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