├── .gitignore ├── .gitmodules ├── Dappfile ├── LICENSE ├── Makefile ├── README.md └── src ├── simple_role_auth.sol ├── simplecoin.sol ├── simplecoin.t.sol └── simplecoin_factory.sol /.gitignore: -------------------------------------------------------------------------------- 1 | /out 2 | -------------------------------------------------------------------------------- /.gitmodules: -------------------------------------------------------------------------------- 1 | [submodule "lib/ds-feeds"] 2 | path = lib/ds-feeds 3 | url = https://github.com/dapphub/ds-feeds 4 | [submodule "lib/ds-token"] 5 | path = lib/ds-token 6 | url = https://github.com/dapphub/ds-token 7 | [submodule "lib/ds-roles"] 8 | path = lib/ds-roles 9 | url = https://github.com/dapphub/ds-roles 10 | [submodule "lib/ds-base"] 11 | path = lib/ds-base 12 | url = https://github.com/dapphub/ds-base 13 | [submodule "lib/ds-test"] 14 | path = lib/ds-test 15 | url = https://github.com/dapphub/ds-test 16 | -------------------------------------------------------------------------------- /Dappfile: -------------------------------------------------------------------------------- 1 | name simplecoin 2 | description 3 | version 0.0.1 4 | 5 | author 6 | license Apache-2.0 7 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | all:; dapp build 2 | test:; dapp test 3 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Simplecoin 2 | ========== 3 | 4 | A simplecoin is one type of stablecoin which can be run by an 5 | individual or organization. 6 | 7 | It uses a reduced Token collateral model controlled by an owner address. 8 | In the simplest case, stablecoin holders have no protections against 9 | the owner, but constraints can be encoded in the owner as a contract. 10 | 11 | Some example failure modes are never refreshing the price (lost key / 12 | locked out contract), setting a bad a price (or "insider trading"), or 13 | withdrawing too much collateral. There are many different ways to handle 14 | these failure modes, which must be decided and written by each owner 15 | contract. 16 | 17 | This simplecoin uses a flexible [access control system][ds-auth] to 18 | limit public access. This system can be completely configured by the 19 | contract deployer; see [below](#authentication) for more details. 20 | 21 | [ds-auth]: https://github.com/nexusdev/ds-auth 22 | 23 | The code is as simple as possible to reduce the cost of independent 24 | verification. It is just a building block that needs to be carefully 25 | constrained. It is also completely unsuitable for maintaining price 26 | stability at scale, besides also being unsuitable for any purpose in 27 | general. 28 | 29 | The idea is to give potential [oracles], [keepers] and [market] 30 | [makers] something to do while Maker's stablecoin engine undergoes 31 | refinement. 32 | 33 | [oracles]: https://github.com/nexusdev/feedbase 34 | [keepers]: https://github.com/nexusdev/keeper 35 | [market]: https://github.com/makerdao/maker-market 36 | [makers]: https://github.com/makerdao/maker-market-matcher 37 | 38 | 39 | Authentication 40 | -------------- 41 | 42 | Unrestricted token access is scary! Therefore, the default for this 43 | simplecoin is to only allow access to the owner (the contract 44 | deployer). This isn't completely useless: for example, the owner 45 | could use this for pre-allocation of user balances before enabling 46 | public access. 47 | 48 | A more flexible model is Role-Based Access Control, creating 49 | distinct classes of user with different permissions. Simplecoins 50 | deployed using the factory come with a simple pre-configured RBAC 51 | that has three classes: "admin", "issuer" and "holder". 52 | 53 | An *admin* can manage collateral types, including registration, 54 | debt celings and price feeds; *issuers* can exchange collateral for 55 | simplecoins (issue / cover) and form the link with *holders*, who 56 | are able to use the simplecoin as an ERC20 token. 57 | 58 | All questions of allocation to these user classes are left up to the 59 | contract deployer, the "owner", who can configure this as they wish. 60 | 61 | The factory also allows creation of a Simplecoin with an arbitrary, 62 | user-supplied authority implementing 63 | `canCall(address caller, address callee, bytes4 sig) returns (bool)`. 64 | `canCall` determines whether `caller` can call the function with 65 | signature `sig` at address `callee`, and is tested for calls to any 66 | non-constant public function, controlling selective user access. 67 | 68 | Using 69 | ----- 70 | 71 | 72 | Setting up the coin, with a feed and rules: 73 | 74 | ``` 75 | var fb = Feedbase(0x...); // feedbase instance 76 | var rules = "http://link.to.rules"; // arbitrary rules the owner is working by 77 | var coin = Simplecoin(feedbase, rules); 78 | ``` 79 | 80 | Registration of collateral assets (owner only): 81 | 82 | ``` 83 | var ETH = ERC20(0x...); // use the eth wrapper as a token 84 | var eth_feed = fb.claim(ETH); // price feed that needs to be managed 85 | 86 | // register the collateral asset 87 | var eth = coin.register(ETH); 88 | // configure the collateral 89 | coin.setVault(eth, 0x...); // secure, auditable, storage for tokens. DIY! 90 | coin.setFeed(eth, eth_feed); // which price feed to follow 91 | coin.setSpread(eth, 1000); // skim a 0.1% profit on all ETH<->coin exchange 92 | coin.setCeiling(eth, 10000); // maximum quantity of coin backed by ETH 93 | 94 | // add a buffer against value loss (optional!) 95 | ETH.transfer(coin.vault(eth), 100 * 10 ** 18); // 100 ETH backing... 96 | ``` 97 | 98 | Issuance: 99 | 100 | ``` 101 | // exchange 50 ETH for `how_many` coins 102 | var how_many = coin.issue(eth, 50); 103 | // now do what you want with the coins (maybe a holder bought them off you?) 104 | 105 | // turn your coins back into ETH (remember owner can take a cut) 106 | var give_me_back_my_eth = coin.cover(eth, how_many); 107 | ``` 108 | 109 | Holders can do any ERC20 operation they want, but can only transfer 110 | to other holders. 111 | 112 | Want to help? 113 | --- 114 | 115 | Ask us about: 116 | 117 | * Bug bounties 118 | * Building UIs 119 | * Writing tests 120 | * Working on maker-core 121 | 122 | https://chat.makerdao.com 123 | -------------------------------------------------------------------------------- /src/simple_role_auth.sol: -------------------------------------------------------------------------------- 1 | pragma solidity ^0.4.8; 2 | 3 | import "ds-roles/role-auth.sol"; 4 | 5 | contract SimpleRoleAuth is DSRoleAuth { 6 | // role identifiers 7 | uint8 public admin = 0; 8 | uint8 public issuer = 1; 9 | uint8 public holder = 2; 10 | 11 | function SimpleRoleAuth(address target) { 12 | // == admin 13 | setRoleCapability(admin, target, sig("register(address)"), true); 14 | setRoleCapability(admin, target, sig("setVault(uint48,address)"), true); 15 | setRoleCapability(admin, target, sig("setFeed(uint48,bytes12)"), true); 16 | setRoleCapability(admin, target, sig("setSpread(uint48,uint256)"), true); 17 | setRoleCapability(admin, target, sig("setCeiling(uint48,uint256)"), true); 18 | setRoleCapability(admin, target, sig("unregister(uint48)"), true); 19 | 20 | // == issuer 21 | setRoleCapability(issuer, target, sig("issue(uint48,uint256)"), true); 22 | setRoleCapability(issuer, target, sig("cover(uint48,uint256)"), true); 23 | 24 | // == holder 25 | setRoleCapability(holder, target, sig("transfer(address,uint256)"), true); 26 | setRoleCapability(holder, target, sig("transferFrom(address,address,uint256)"), true); 27 | } 28 | 29 | function sig(string name) constant returns (bytes4) { 30 | return bytes4(sha3(name)); 31 | } 32 | 33 | function addAdmin(address who) auth { 34 | setUserRole(who, admin, true); 35 | setUserRole(who, issuer, true); 36 | setUserRole(who, holder, true); 37 | } 38 | function addIssuer(address who) auth { 39 | setUserRole(who, issuer, true); 40 | setUserRole(who, holder, true); 41 | } 42 | function addHolder(address who) auth { 43 | setUserRole(who, holder, true); 44 | } 45 | 46 | function delAdmin(address who) auth { 47 | setUserRole(who, admin, false); 48 | } 49 | function delIssuer(address who) auth { 50 | setUserRole(who, issuer, false); 51 | } 52 | function delHolder(address who) auth { 53 | setUserRole(who, holder, false); 54 | } 55 | 56 | function isAdmin(address who) constant returns (bool) { 57 | return hasUserRole(who, admin); 58 | } 59 | function isIssuer(address who) constant returns (bool) { 60 | return hasUserRole(who, issuer); 61 | } 62 | function isHolder(address who) constant returns (bool) { 63 | return hasUserRole(who, holder); 64 | } 65 | } 66 | -------------------------------------------------------------------------------- /src/simplecoin.sol: -------------------------------------------------------------------------------- 1 | pragma solidity ^0.4.8; 2 | 3 | import "ds-base/base.sol"; 4 | import "ds-token/base.sol"; 5 | import "ds-feeds/feeds.sol"; 6 | 7 | import "./simple_role_auth.sol"; 8 | 9 | contract SimplecoinEvents { 10 | event LogIssue(address indexed from, uint48 collateral_type, uint stablecoin_quantity); 11 | event LogCover(address indexed to, uint48 collateral_type, uint stablecoin_quantity); 12 | } 13 | 14 | contract Simplecoin is DSTokenBase(0), DSAuth, DSBase, SimplecoinEvents { 15 | // precision of the price feed 16 | uint public constant PRICE_UNIT = 10**18; 17 | 18 | DSFeeds public feeds; 19 | string public name; 20 | string public symbol; 21 | uint8 public constant decimals = 18; // 18 decimal places, the same as ETH. 22 | 23 | CollateralType[] types; 24 | 25 | struct CollateralType { 26 | ERC20 token; 27 | bytes12 feed; 28 | address vault; 29 | uint spread; 30 | uint debt; 31 | uint ceiling; 32 | } 33 | 34 | function Simplecoin( 35 | DSFeeds _feeds, 36 | string _name, 37 | string _symbol 38 | ) { 39 | feeds = _feeds; 40 | name = _name; 41 | symbol = _symbol; 42 | } 43 | 44 | //------------------------------------------------------ 45 | 46 | function nextType() constant returns (uint48) { 47 | return uint48(types.length); 48 | } 49 | 50 | function register(ERC20 token) 51 | auth returns (uint48 id) 52 | { 53 | return uint48(types.push(CollateralType({ 54 | token: token, 55 | vault: 0, 56 | feed: 0, 57 | spread: 0, 58 | debt: 0, 59 | ceiling: 0, 60 | })) - 1); 61 | } 62 | 63 | function setVault(uint48 type_id, address vault) auth { 64 | types[type_id].vault = vault; 65 | } 66 | 67 | function setFeed(uint48 type_id, bytes12 feed) auth { 68 | types[type_id].feed = feed; 69 | } 70 | 71 | function setSpread(uint48 type_id, uint spread) auth { 72 | types[type_id].spread = spread; 73 | } 74 | 75 | function setCeiling(uint48 type_id, uint ceiling) auth { 76 | types[type_id].ceiling = ceiling; 77 | } 78 | 79 | function unregister(uint48 collateral_type) auth { 80 | delete types[collateral_type]; 81 | } 82 | 83 | //------------------------------------------------------ 84 | 85 | function token(uint48 type_id) constant returns (ERC20) { 86 | return types[type_id].token; 87 | } 88 | 89 | function vault(uint48 type_id) constant returns (address) { 90 | return types[type_id].vault; 91 | } 92 | 93 | function feed(uint48 type_id) constant returns (bytes12) { 94 | return types[type_id].feed; 95 | } 96 | 97 | function spread(uint48 type_id) constant returns (uint) { 98 | return types[type_id].spread; 99 | } 100 | 101 | function ceiling(uint48 type_id) constant returns (uint) { 102 | return types[type_id].ceiling; 103 | } 104 | 105 | function debt(uint48 type_id) constant returns (uint) { 106 | return types[type_id].debt; 107 | } 108 | 109 | //------------------------------------------------------ 110 | 111 | bytes4 transfer_sig = bytes4(sha3("transfer(address,uint256)")); 112 | 113 | modifier transfer_auth(address to, uint amount) { 114 | // transfer recipients must also be able to call transfer 115 | assert(DSAuthority(authority).canCall(to, this, transfer_sig)); 116 | _; 117 | } 118 | 119 | function transfer(address to, uint amount) 120 | auth 121 | transfer_auth(to, amount) 122 | returns (bool) 123 | { 124 | return super.transfer(to, amount); 125 | } 126 | 127 | function transferFrom(address from, address to, uint amount) 128 | auth 129 | transfer_auth(to, amount) 130 | returns (bool) 131 | { 132 | return super.transferFrom(from, to, amount); 133 | } 134 | 135 | //------------------------------------------------------ 136 | 137 | modifier zeroguard(uint48 collateral_type) { 138 | var t = types[collateral_type]; 139 | assert(t.token != address(0)); 140 | assert(t.vault != address(0)); 141 | assert(t.feed != 0); 142 | _; 143 | } 144 | 145 | function issue(uint48 collateral_type, uint pay_how_much) 146 | auth 147 | zeroguard(collateral_type) 148 | mutex 149 | returns (uint issued_quantity) 150 | { 151 | var t = types[collateral_type]; 152 | 153 | assert(t.token.transferFrom(msg.sender, t.vault, pay_how_much)); 154 | 155 | var price = getPrice(t.feed); 156 | var mark_price = price + price / t.spread; 157 | assert(safeToMul(PRICE_UNIT, pay_how_much)); 158 | issued_quantity = (PRICE_UNIT * pay_how_much) / mark_price; 159 | 160 | assert(safeToAdd(_balances[msg.sender], issued_quantity)); 161 | _balances[msg.sender] += issued_quantity; 162 | 163 | assert(safeToAdd(_supply, issued_quantity)); 164 | _supply += issued_quantity; 165 | 166 | assert(safeToAdd(t.debt, issued_quantity)); 167 | t.debt += issued_quantity; 168 | 169 | assert(t.debt <= t.ceiling); 170 | assert(_balances[msg.sender] <= _supply); 171 | 172 | LogIssue(msg.sender, collateral_type, issued_quantity); 173 | } 174 | 175 | function cover(uint48 collateral_type, uint stablecoin_quantity) 176 | auth 177 | zeroguard(collateral_type) 178 | mutex 179 | returns (uint returned_amount) 180 | { 181 | var t = types[collateral_type]; 182 | 183 | assert(safeToSub(_balances[msg.sender], stablecoin_quantity)); 184 | _balances[msg.sender] -= stablecoin_quantity; 185 | 186 | assert(safeToSub(_supply, stablecoin_quantity)); 187 | _supply -= stablecoin_quantity; 188 | 189 | assert(safeToSub(t.debt, stablecoin_quantity)); 190 | t.debt -= stablecoin_quantity; 191 | 192 | var price = getPrice(t.feed); 193 | var mark_price = price - price / t.spread; 194 | assert(safeToMul(stablecoin_quantity, mark_price)); 195 | returned_amount = (stablecoin_quantity * mark_price) / PRICE_UNIT; 196 | 197 | assert(t.token.transferFrom(t.vault, msg.sender, returned_amount)); 198 | 199 | assert(t.debt <= t.ceiling); 200 | assert(_balances[msg.sender] <= _supply); 201 | 202 | LogCover(msg.sender, collateral_type, returned_amount); 203 | } 204 | 205 | function getPrice(bytes12 feed) internal returns (uint) { 206 | var (price, ok) = feeds.tryGet(feed); 207 | assert(ok); 208 | return uint(price); 209 | } 210 | } 211 | -------------------------------------------------------------------------------- /src/simplecoin.t.sol: -------------------------------------------------------------------------------- 1 | pragma solidity ^0.4.8; 2 | 3 | import "ds-test/test.sol"; 4 | import "ds-token/base.sol"; 5 | import "ds-feeds/feeds.sol"; 6 | 7 | import "./simplecoin.sol"; 8 | import "./simplecoin_factory.sol"; 9 | 10 | contract SimplecoinTest is DSTest { 11 | // Be explicit about units. Can force this by setting to prime 12 | // powers, but then percentage changes are difficult. 13 | uint constant COL1 = 1; 14 | uint constant COIN = 1; 15 | 16 | Simplecoin coin; 17 | DSFeeds feeds; 18 | Vault vault; 19 | DSTokenBase col1; 20 | uint48 icol1; 21 | bytes12 feed1; 22 | 23 | function setUp() { 24 | feeds = new DSFeeds(); 25 | 26 | coin = new Simplecoin(feeds, "Test Coin Token", "TCT"); 27 | 28 | col1 = new DSTokenBase(10**24 * COL1); 29 | col1.approve(coin, 10**24 * COL1); 30 | 31 | feed1 = feeds.claim(); 32 | // set price to 0.1 simplecoins per unit of col1 33 | var price = (coin.PRICE_UNIT() * COL1) / (10 * COIN); 34 | feeds.set(feed1, bytes32(price), uint40(block.timestamp + 10)); 35 | 36 | vault = new Vault(); 37 | vault.approve(col1, coin, uint(-1)); // pragma: no audit 38 | 39 | icol1 = coin.register(col1); 40 | coin.setVault(icol1, vault); 41 | coin.setFeed(icol1, feed1); 42 | coin.setSpread(icol1, 1000); // 0.1% either way 43 | } 44 | 45 | function testAuthSetup() { 46 | assertEq(coin.authority(), this); 47 | } 48 | 49 | function testBasics() { 50 | coin.setCeiling(icol1, 10 ** 6 * COIN); 51 | 52 | var obtained = coin.issue(icol1, 100000 * COL1); 53 | 54 | assertEq(obtained, 999000 * COIN); 55 | assertEq(obtained, coin.balanceOf(this)); 56 | 57 | var before = col1.balanceOf(this); 58 | var returned = coin.cover(icol1, coin.balanceOf(this)); 59 | var afterward = col1.balanceOf(this); // `after` is a keyword?? 60 | 61 | assertEq(returned, afterward - before); 62 | assertEq(returned, 99800 * COL1); // minus 0.2% 63 | } 64 | 65 | function testIssueTransferFromCaller() { 66 | coin.setCeiling(icol1, 10 ** 6 * COIN); 67 | var collateral_spend = 100000 * COL1; 68 | 69 | var balance_before = col1.balanceOf(this); 70 | var obtained = coin.issue(icol1, collateral_spend); 71 | assertEq(balance_before - col1.balanceOf(this), collateral_spend); 72 | } 73 | 74 | function testIssueTransferToVault() { 75 | coin.setCeiling(icol1, 10 ** 6 * COIN); 76 | var collateral_spend = 100000 * COL1; 77 | 78 | var balance_before = col1.balanceOf(vault); 79 | var obtained = coin.issue(icol1, collateral_spend); 80 | assertEq(col1.balanceOf(vault) - balance_before, collateral_spend); 81 | } 82 | 83 | function testIssueTransferToCaller() { 84 | coin.setCeiling(icol1, 10 ** 6 * COIN); 85 | var collateral_spend = 100000 * COL1; 86 | 87 | var balance_before = coin.balanceOf(this); 88 | var obtained = coin.issue(icol1, collateral_spend); 89 | var balance_after = coin.balanceOf(this); 90 | 91 | assertEq(balance_after - balance_before, 999000 * COIN); 92 | } 93 | 94 | function testIssueCreatesCoin() { 95 | coin.setCeiling(icol1, 10 ** 6 * COIN); 96 | var collateral_spend = 100000 * COL1; 97 | 98 | var supply_before = coin.totalSupply(); 99 | var obtained = coin.issue(icol1, collateral_spend); 100 | var supply_after = coin.totalSupply(); 101 | 102 | assertEq(supply_after - supply_before, 999000 * COIN); 103 | } 104 | 105 | function testCoverTransferToCaller() { 106 | coin.setCeiling(icol1, 10 ** 6 * COIN); 107 | var collateral_spend = 100000 * COL1; 108 | var obtained = coin.issue(icol1, collateral_spend); 109 | 110 | var balance_before = col1.balanceOf(this); 111 | var returned = coin.cover(icol1, obtained); 112 | var balance_after = col1.balanceOf(this); 113 | 114 | assertEq(balance_after - balance_before, returned); 115 | assertEq(balance_after - balance_before, 99800 * COL1); 116 | } 117 | 118 | function testCoverTransferFromVault() { 119 | coin.setCeiling(icol1, 10 ** 6 * COIN); 120 | var collateral_spend = 100000 * COL1; 121 | var obtained = coin.issue(icol1, collateral_spend); 122 | 123 | var balance_before = col1.balanceOf(vault); 124 | var returned = coin.cover(icol1, obtained); 125 | var balance_after = col1.balanceOf(vault); 126 | 127 | assertEq(balance_before - balance_after, 99800 * COL1); 128 | } 129 | 130 | function testCoverTransferFromCaller() { 131 | coin.setCeiling(icol1, 10 ** 6 * COIN); 132 | var collateral_spend = 100000 * COL1; 133 | var obtained = coin.issue(icol1, collateral_spend); 134 | 135 | var balance_before = coin.balanceOf(this); 136 | var returned = coin.cover(icol1, obtained); 137 | var balance_after = coin.balanceOf(this); 138 | 139 | assertEq(balance_before - balance_after, 999000 * COIN); 140 | } 141 | 142 | function testCoverDestroysCoin() { 143 | coin.setCeiling(icol1, 10 ** 6 * COIN); 144 | var collateral_spend = 100000 * COL1; 145 | var obtained = coin.issue(icol1, collateral_spend); 146 | 147 | var supply_before = coin.totalSupply(); 148 | var returned = coin.cover(icol1, obtained); 149 | var supply_after = coin.totalSupply(); 150 | 151 | assertEq(supply_before - supply_after, 999000 * COIN); 152 | } 153 | } 154 | 155 | contract SimpleAuthTest is DSTest { 156 | Simplecoin coin; 157 | SimplecoinFactory factory; 158 | 159 | DSFeeds feeds; 160 | Vault vault; 161 | 162 | FakePerson admin; 163 | FakePerson issuer; 164 | FakePerson holder; 165 | 166 | DSTokenBase _token; 167 | uint48 _id; 168 | 169 | bytes12 feed; 170 | 171 | function setUp() { 172 | factory = new SimplecoinFactory(); 173 | feeds = new DSFeeds(); 174 | 175 | coin = factory.create(feeds, "Test Coin Token", "TCT"); 176 | _token = new DSTokenBase(1000); 177 | 178 | admin = new FakePerson(coin); 179 | issuer = new FakePerson(coin); 180 | holder = new FakePerson(coin); 181 | 182 | SimpleRoleAuth(coin.authority()).addAdmin(admin); 183 | SimpleRoleAuth(coin.authority()).addIssuer(issuer); 184 | SimpleRoleAuth(coin.authority()).addHolder(holder); 185 | 186 | _id = coin.register(_token); 187 | _token.transfer(admin, 100); 188 | _token.transfer(holder, 100); 189 | _token.transfer(issuer, 100); 190 | 191 | var feed = feeds.claim(); 192 | // set price to 1:1, never expire 193 | feeds.set(feed, bytes32(coin.PRICE_UNIT()), uint40(-1)); 194 | coin.setFeed(_id, feed); 195 | 196 | vault = new Vault(); 197 | vault.approve(_token, coin, uint(-1)); 198 | coin.setVault(_id, vault); 199 | 200 | coin.setSpread(_id, uint(-1)); // 0% cut 201 | coin.setCeiling(_id, uint(-1)); // no debt limit 202 | 203 | //We need to allow the coin to transfer _token from the issuer 204 | issuer.approve(_token, coin, uint(-1)); 205 | } 206 | 207 | function testSetUp() { 208 | // we own the authority 209 | assertEq(SimpleRoleAuth(coin.authority()).authority(), address(this)); 210 | } 211 | 212 | function testCreatorCanTransferOwnership() { 213 | FakePerson newOwner = new FakePerson(coin); 214 | SimpleRoleAuth(coin.authority()).setAuthority(DSIAuthority(newOwner)); 215 | assertEq(SimpleRoleAuth(coin.authority()).authority(), newOwner); 216 | } 217 | 218 | function testAdminCanRegister() { 219 | var token = new DSTokenBase(1000); 220 | var id = admin.register(token); 221 | assertEq(coin.token(id), token); 222 | } 223 | 224 | function testFailIssuerRegister() { 225 | var token = new DSTokenBase(1000); 226 | issuer.register(token); 227 | } 228 | 229 | function testFailHolderRegister() { 230 | var token = new DSTokenBase(1000); 231 | holder.register(token); 232 | } 233 | 234 | function testAdminCanSetVault() { 235 | admin.setVault(_id, 0x123); 236 | assertEq(coin.vault(_id), 0x123); 237 | } 238 | 239 | function testFailIssuerSetVault() { 240 | Simplecoin(issuer).setVault(_id, 0x123); 241 | } 242 | function testFailHolderSetVault() { 243 | Simplecoin(holder).setVault(_id, 0x123); 244 | } 245 | 246 | function testAdminCanSetFeed() { 247 | admin.setFeed(_id, 123); 248 | assertEq(uint(coin.feed(_id)), 123); 249 | } 250 | function testFailIssuerSetFeed() { 251 | issuer.setFeed(_id, 123); 252 | } 253 | function testFailHolderSetFeed() { 254 | holder.setFeed(_id, 123); 255 | } 256 | 257 | function testAdminCanSetSpread() { 258 | admin.setSpread(_id, 1000); 259 | assertEq(coin.spread(_id), 1000); 260 | } 261 | function testFailIssuerSetSpread() { 262 | issuer.setSpread(_id, 1000); 263 | } 264 | function testFailHolderSetSpread() { 265 | holder.setSpread(_id, 1000); 266 | } 267 | 268 | function testAdminCanSetCeiling() { 269 | admin.setCeiling(_id, 1000); 270 | assertEq(coin.ceiling(_id), 1000); 271 | } 272 | function testFailIssuerSetCeiling() { 273 | issuer.setCeiling(_id, 1000); 274 | } 275 | function testFailHolderSetCeiling() { 276 | holder.setCeiling(_id, 1000); 277 | } 278 | 279 | function testAdminCanUnregister() { 280 | admin.unregister(_id); 281 | assertEq(coin.token(_id), 0); 282 | } 283 | function testFailIssuerUnregister() { 284 | issuer.unregister(_id); 285 | } 286 | function testFailHolderUnregister() { 287 | holder.unregister(_id); 288 | } 289 | 290 | function testIssuerCanIssue() { 291 | issuer.issue(_id, 100); 292 | assertEq(coin.balanceOf(issuer), 100); 293 | } 294 | function testIssuerCanCover() { 295 | issuer.issue(_id, 100); 296 | issuer.cover(_id, 100); 297 | } 298 | function testFailHolderIssue() { 299 | holder.issue(_id, 100); 300 | } 301 | function testFailHolderCover() { 302 | issuer.issue(_id, 100); 303 | holder.cover(_id, 100); 304 | } 305 | 306 | function testHolderCanReceive() { 307 | issuer.issue(_id, 100); 308 | issuer.transfer(holder, 100); 309 | assertEq(coin.balanceOf(holder), 100); 310 | } 311 | function testHolderCanTransfer() { 312 | issuer.issue(_id, 100); 313 | issuer.transfer(holder, 50); 314 | holder.transfer(admin, 25); 315 | } 316 | function testFailNonHolderReceive() { 317 | FakePerson unauthorised = new FakePerson(coin); 318 | issuer.issue(_id, 100); 319 | issuer.transfer(holder, 50); 320 | holder.transfer(unauthorised, 25); 321 | } 322 | function testFailNonHolderTransfer() { 323 | FakePerson unauthorised = new FakePerson(coin); 324 | 325 | issuer.issue(_id, 100); 326 | issuer.approve(coin, unauthorised, 100); 327 | unauthorised.transferFrom(issuer, holder, 25); 328 | } 329 | } 330 | 331 | contract Vault { 332 | function approve(ERC20 token, address who, uint how_much) { 333 | token.approve(who, how_much); 334 | } 335 | } 336 | 337 | contract FakePerson { 338 | Simplecoin coin; 339 | 340 | function FakePerson(Simplecoin coin_) { 341 | coin = coin_; 342 | } 343 | 344 | function register(ERC20 token) returns (uint48) { 345 | return coin.register(token); 346 | } 347 | 348 | function unregister(uint48 id) { 349 | coin.unregister(id); 350 | } 351 | 352 | function approve(ERC20 token, address who, uint how_much) { 353 | token.approve(who, how_much); 354 | } 355 | 356 | function setVault(uint48 id, address addr) { 357 | coin.setVault(id, addr); 358 | } 359 | 360 | function setFeed(uint48 id, bytes12 feed) { 361 | coin.setFeed(id, feed); 362 | } 363 | 364 | function setSpread(uint48 id, uint spread) { 365 | coin.setSpread(id, spread); 366 | } 367 | 368 | function setCeiling(uint48 id, uint ceiling) { 369 | coin.setCeiling(id, ceiling); 370 | } 371 | 372 | function issue(uint48 id, uint amount) { 373 | coin.issue(id, amount); 374 | } 375 | 376 | function cover(uint48 id, uint amount) { 377 | coin.cover(id, amount); 378 | } 379 | 380 | function transfer(address addr, uint amount) { 381 | coin.transfer(addr, amount); 382 | } 383 | 384 | function transferFrom(address from, address to, uint amount) { 385 | coin.transferFrom(from, to, amount); 386 | } 387 | } 388 | -------------------------------------------------------------------------------- /src/simplecoin_factory.sol: -------------------------------------------------------------------------------- 1 | pragma solidity ^0.4.8; 2 | 3 | import "./simplecoin.sol"; 4 | import "./simple_role_auth.sol"; 5 | 6 | contract SimplecoinFactory { 7 | mapping (uint => Simplecoin) public coins; 8 | uint public count; 9 | 10 | function create(DSFeeds feeds, string name, string symbol) 11 | returns (Simplecoin coin) 12 | { 13 | coin = new Simplecoin(feeds, name, symbol); 14 | var role = new SimpleRoleAuth(address(coin)); 15 | 16 | coin.setAuthority(role); 17 | role.setRootUser(DSIAuthority(msg.sender), true); 18 | role.setAuthority(DSIAuthority(msg.sender)); 19 | 20 | coins[count++] = coin; 21 | } 22 | } 23 | --------------------------------------------------------------------------------