├── .babelrc ├── .gitignore ├── .vscode └── settings.json.default ├── LICENSE ├── README.md ├── contracts ├── ForkDelta.sol ├── IToken.sol ├── LSafeMath.sol ├── Migrations.sol └── test │ └── SampleToken.sol ├── migrations ├── 1_initial_migration.js └── 2_deploy_contracts.js ├── package.json ├── test └── ForkDelta.js └── truffle.js /.babelrc: -------------------------------------------------------------------------------- 1 | { 2 | "presets": ["es2015", "stage-2", "stage-3"] 3 | } -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ## 2 | # Project-specific 3 | new_tokens.csv 4 | 5 | ## 6 | # Pythonic 7 | 8 | # Byte-compiled / optimized / DLL files 9 | __pycache__/ 10 | *.py[cod] 11 | *$py.class 12 | 13 | # C extensions 14 | *.so 15 | 16 | # Distribution / packaging 17 | .Python 18 | env/ 19 | build/ 20 | develop-eggs/ 21 | dist/ 22 | downloads/ 23 | eggs/ 24 | .eggs/ 25 | lib/ 26 | lib64/ 27 | parts/ 28 | sdist/ 29 | var/ 30 | wheels/ 31 | *.egg-info/ 32 | .installed.cfg 33 | *.egg 34 | 35 | # PyInstaller 36 | # Usually these files are written by a python script from a template 37 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 38 | *.manifest 39 | *.spec 40 | 41 | # Installer logs 42 | pip-log.txt 43 | pip-delete-this-directory.txt 44 | 45 | # Unit test / coverage reports 46 | htmlcov/ 47 | .tox/ 48 | .coverage 49 | .coverage.* 50 | .cache 51 | nosetests.xml 52 | coverage.xml 53 | *.cover 54 | .hypothesis/ 55 | 56 | # Translations 57 | *.mo 58 | *.pot 59 | 60 | # Django stuff: 61 | *.log 62 | local_settings.py 63 | 64 | # Flask stuff: 65 | instance/ 66 | .webassets-cache 67 | 68 | # Scrapy stuff: 69 | .scrapy 70 | 71 | # Sphinx documentation 72 | docs/_build/ 73 | 74 | # PyBuilder 75 | target/ 76 | 77 | # Jupyter Notebook 78 | .ipynb_checkpoints 79 | 80 | # pyenv 81 | .python-version 82 | 83 | # celery beat schedule file 84 | celerybeat-schedule 85 | 86 | # SageMath parsed files 87 | *.sage.py 88 | 89 | # dotenv 90 | .env 91 | 92 | # virtualenv 93 | .venv 94 | venv/ 95 | ENV/ 96 | 97 | # Spyder project settings 98 | .spyderproject 99 | .spyproject 100 | 101 | # Rope project settings 102 | .ropeproject 103 | 104 | # mkdocs documentation 105 | /site 106 | 107 | # mypy 108 | .mypy_cache/ 109 | 110 | # node 111 | node_modules/ 112 | package-lock.json 113 | 114 | #misc 115 | .pydevproject 116 | .project 117 | build/* 118 | node_modules/* 119 | .vscode/settings.json 120 | -------------------------------------------------------------------------------- /.vscode/settings.json.default: -------------------------------------------------------------------------------- 1 | { 2 | "solidity.compileUsingRemoteVersion" : "v0.4.19+commit.c4cbbb05", 3 | "solidity.linter": "solhint", 4 | "solidity.solhintRules": { 5 | "avoid-throw": false, 6 | "avoid-suicide": "error", 7 | "avoid-sha3": "warn", 8 | "indent": false, 9 | "two-lines-top-level-separator": false, 10 | "func-param-name-mixedcase": false, 11 | "func-name-mixedcase": false, 12 | "max-line-length": false, 13 | "function-max-lines": false 14 | } 15 | 16 | } -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 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 General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ForkDelta's Smart Contract 2 | 3 | This is the official repository for all things regarding the ForkDela smart contract. 4 | All contracts are located in the `contracts` folder. 5 | 6 | ## Summary 7 | - [Development](#development) 8 | - [Setting up a development environment](#setting-up-a-development-environment) 9 | - [Migrating and testing with Ganache](#migrating-and-testing-with-ganache) 10 | - [Migrating and testing with truffle develop](#migrating-and-testing-with-truffle-develop) 11 | - [Migrating to the live/production chain](#migrating-to-the-liveproduction-chain) 12 | - [Libraries](#libraries) 13 | - [LSafeMath](#library-lsafemath) 14 | - [Contracts](#contracts) 15 | - [IToken](#contract-itoken) 16 | - [Variables](#itoken-variables) 17 | - [Events](#itoken-events) 18 | - [Functions](#itoken-functions) 19 | - [ForkDelta](#contract-forkdelta) 20 | - [Variables](#forkdelta-variables) 21 | - [Events](#forkdelta-events) 22 | - [Modifiers](#forkdelta-modifiers) 23 | - [Functions](#forkdelta-functions) 24 | 25 | 26 | ## Development 27 | 28 | ### Setting up a development environment 29 | Requirements: 30 | * Node.js (https://nodejs.org/en/) 31 | * git client (https://git-scm.com/download/) 32 | 33 | Setup: 34 | 1. Install truffle: `npm install -g truffle` 35 | 2. On Windows install the necessary build tools: `npm install --global --production windows-build-tools` 36 | 3. Install Ganache from: http://truffleframework.com/ganache/ 37 | 4. Clone the repo: git clone https://github.com/forkdelta/smart_contract.git 38 | 5. Change into the root directory: `cd smart_contract` 39 | 6. Install all node.js requirements from package.json: `npm install` 40 | 7. If you use VSCode, copy `.vscode\settings.json.default` to `.vscode\settings.json` for a reasonable solhint linter configuration 41 | 42 | ### Migrating and testing with Ganache 43 | * Start ganache 44 | * Compile: `truffle compile` 45 | * Migrate: `truffle migrate` 46 | * Run test cases: `truffle test` 47 | 48 | ### Migrating and testing with truffle develop 49 | * `truffle develop` 50 | * Compile: `compile` 51 | * Migrate: `migrate` 52 | * Run test cases: `test` 53 | 54 | ### Migrating to the live/production chain 55 | * Edit "live" section in `truffle.js`: 56 | * Set reasonable gas price based on https://ethgasstation.info 57 | * Start local ethereum node (geth/parity) and set connection parameters in `truffle.js` 58 | * Set/verify creation parameter for ForkDelta contract in `./migrations/2_deploy_contracts_js` 59 | * Unlock account in geth/parity that is used for deploying the contract (first account or the one specified with "from" in `truffle.js`) 60 | * `truffle migrate -network=live` 61 | 62 | ## Libraries 63 | 64 | ### library `LSafeMath` 65 | 66 | This is a library for math operations with safety checks that will throw on error. 67 | 68 | ## Contracts 69 | 70 | ### contract `IToken` 71 | 72 | This is the token interface necessary for working with tokens within the exchange contract. 73 | 74 | #### `IToken` Variables 75 | 76 | decimals `uint public decimals` 77 | name `string public name` 78 | 79 | #### `IToken` Events 80 | 81 | ##### `event Transfer(address indexed _from, address indexed _to, uint256 _value);` 82 | ##### `event Approval(address indexed _owner, address indexed _spender, uint256 _value);` 83 | 84 | 85 | #### `IToken` Functions 86 | 87 | #### `function totalSupply() public constant returns (uint256 supply) {}` 88 | @return total amount of tokens 89 | 90 | #### `function balanceOf(address _owner) public constant returns (uint256 balance) {}` 91 | @param \_owner The address from which the balance will be retrieved 92 | @return The balance 93 | 94 | #### `function transfer(address _to, uint256 _value) public returns (bool success) {}` 95 | @notice send `_value` token to `_to` from `msg.sender` 96 | @param _to The address of the recipient 97 | @param _value The amount of token to be transferred 98 | @return Whether the transfer was successful or not 99 | 100 | #### `function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {}` 101 | @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from` 102 | @param _from The address of the sender 103 | @param _to The address of the recipient 104 | @param _value The amount of token to be transferred 105 | @return Whether the transfer was successful or not 106 | 107 | #### `function approve(address _spender, uint256 _value) public returns (bool success) {}` 108 | @notice `msg.sender` approves `_addr` to spend `_value` tokens 109 | @param _spender The address of the account able to transfer the tokens 110 | @param _value The amount of wei to be approved for transfer 111 | @return Whether the approval was successful or not 112 | 113 | #### `function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {}` 114 | @param _owner The address of the account owning tokens 115 | @param _spender The address of the account able to transfer the tokens 116 | @return Amount of remaining tokens allowed to spent 117 | 118 | --- 119 | 120 | ### contract `ForkDelta` 121 | 122 | This is the main contract for the ForkDelta exchange. 123 | This contract uses the LSafeMath library for uint variables. 124 | 125 | #### `ForkDelta` Variables 126 | 127 | __admin__ `address public admin` 128 | The administrator's Ethereum address 129 | 130 | __feeAccount__ `address public feeAccount` 131 | The Ethereum address that fees will be sent to 132 | 133 | __feeTake__ `uint public feeTake` 134 | The amount (in ether) that will be taken as a fee on takes 135 | 136 | __freeUntilDate__ `uint public freeUntilDate` 137 | The date in UNIX timestamp that trades will be free until 138 | 139 | __depositingTokenFlag__ `bool private depositingTokenFlag` 140 | True when Token.transferFrom is being called from depositToken 141 | 142 | __tokens__ `mapping (address => mapping (address => uint)) public tokens` 143 | The mapping of token addresses to mapping of account balances (token=0 means Ether) 144 | 145 | __orders__ `mapping (address => mapping (bytes32 => bool)) public orders` 146 | The mapping of user accounts to mapping of order hashes to booleans (true = submitted by user, equivalent to offchain signature) 147 | 148 | __orderFills__ `mapping (address => mapping (bytes32 => uint)) public orderFills;` 149 | The mapping of user accounts to mapping of order hashes to uints (amount of order that has been filled) 150 | 151 | __predecessor__ `address public predecessor` 152 | Address of the previous version of this contract. If address(0), this is the first version 153 | 154 | __successor__ `address public successor` 155 | Address of the next version of this contract. If address(0), this is the most up to date version 156 | 157 | __version__ `uint16 public version` 158 | The version # of the contract 159 | 160 | #### `ForkDelta` Events 161 | 162 | ##### `event Order(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user);` 163 | ##### `event Cancel(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s);` 164 | ##### `event Trade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, address get, address give);` 165 | ##### `event Deposit(address token, address user, uint amount, uint balance);` 166 | ##### `event Withdraw(address token, address user, uint amount, uint balance);` 167 | ##### `event FundsMigrated(address user, address newContract);` 168 | 169 | #### `ForkDelta` Modifiers 170 | 171 | #### `modifier isAdmin()` 172 | This is a modifier for functions to check if the sending user address is the same as the admin user address. 173 | 174 | #### `ForkDelta` Functions 175 | 176 | #### `function ForkDelta(address admin_, address feeAccount_, uint feeTake_, uint freeUntilDate_, address predecessor_) public` 177 | Constructor function. This is only called on contract creation. 178 | 179 | #### `function() public` 180 | The fallback function. Ether transfered into the contract is not accepted. 181 | 182 | #### `function changeAdmin(address admin_) public isAdmin` 183 | Changes the official admin user address. Accepts Ethereum address. 184 | 185 | #### `function changeFeeAccount(address feeAccount_) public isAdmin` 186 | Changes the account address that receives trading fees. Accepts Ethereum address. 187 | 188 | #### `function changeFeeTake(uint feeTake_) public isAdmin` 189 | Changes the fee on takes. Can only be changed to a value less than it is currently set at. 190 | 191 | #### `function changeFreeUntilDate(uint freeUntilDate_) public isAdmin` 192 | Changes the date that trades are free until. Accepts UNIX timestamp. 193 | 194 | #### `function setSuccessor(address successor_) public isAdmin` 195 | Changes the successor. Used in updating the contract. 196 | 197 | #### `function deposit() public payable` 198 | This function handles deposits of Ether into the contract. 199 | Emits a Deposit event. 200 | Note: With the payable modifier, this function accepts Ether. 201 | 202 | #### `function withdraw(uint amount) public` 203 | This function handles withdrawals of Ether from the contract. 204 | Verifies that the user has enough funds to cover the withdrawal. 205 | Emits a Withdraw event. 206 | @param amount uint of the amount of Ether the user wishes to withdraw 207 | 208 | #### `function depositToken(address token, uint amount) public` 209 | This function handles deposits of Ethereum based tokens to the contract. 210 | Does not allow Ether. 211 | If token transfer fails, transaction is reverted and remaining gas is refunded. 212 | Emits a Deposit event. 213 | Note: Remember to call Token(address).approve(this, amount) or this contract will not be able to do the transfer on your behalf. 214 | @param token Ethereum contract address of the token or 0 for Ether 215 | @param amount uint of the amount of the token the user wishes to deposit 216 | 217 | #### `function tokenFallback( address sender, uint amount, bytes data) public returns (bool ok)` 218 | This function provides a fallback solution as outlined in ERC223. 219 | If tokens are deposited through depositToken(), the transaction will continue. 220 | If tokens are sent directly to this contract, the transaction is reverted. 221 | @param sender Ethereum address of the sender of the token 222 | @param amount amount of the incoming tokens 223 | @param data attached data similar to msg.data of Ether transactions 224 | 225 | #### `function withdrawToken(address token, uint amount) public` 226 | This function handles withdrawals of Ethereum based tokens from the contract. 227 | Does not allow Ether. 228 | If token transfer fails, transaction is reverted and remaining gas is refunded. 229 | Emits a Withdraw event. 230 | @param token Ethereum contract address of the token or 0 for Ether 231 | @param amount uint of the amount of the token the user wishes to withdraw 232 | 233 | #### `function balanceOf(address token, address user) public constant returns (uint)` 234 | Retrieves the balance of a token based on a user address and token address. 235 | @param token Ethereum contract address of the token or 0 for Ether 236 | @param user Ethereum address of the user 237 | @return the amount of tokens on the exchange for a given user address 238 | 239 | #### `function order(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce) public` 240 | Stores the active order inside of the contract. 241 | Emits an Order event. 242 | Note: tokenGet & tokenGive can be the Ethereum contract address. 243 | @param tokenGet Ethereum contract address of the token to receive 244 | @param amountGet uint amount of tokens being received 245 | @param tokenGive Ethereum contract address of the token to give 246 | @param amountGive uint amount of tokens being given 247 | @param expires uint of block number when this order should expire 248 | @param nonce arbitrary random number 249 | 250 | #### `function trade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s, uint amount) public` 251 | Facilitates a trade from one user to another. 252 | Requires that the transaction is signed properly, the trade isn't past its expiration, and all funds are present to fill the trade. 253 | Calls tradeBalances(). 254 | Updates orderFills with the amount traded. 255 | Emits a Trade event. 256 | Note: tokenGet & tokenGive can be the Ethereum contract address. 257 | Note: amount is in amountGet / tokenGet terms. 258 | @param tokenGet Ethereum contract address of the token to receive 259 | @param amountGet uint amount of tokens being received 260 | @param tokenGive Ethereum contract address of the token to give 261 | @param amountGive uint amount of tokens being given 262 | @param expires uint of block number when this order should expire 263 | @param nonce arbitrary random number 264 | @param user Ethereum address of the user who placed the order 265 | @param v part of signature for the order hash as signed by user 266 | @param r part of signature for the order hash as signed by user 267 | @param s part of signature for the order hash as signed by user 268 | @param amount uint amount in terms of tokenGet that will be "buy" in the trade 269 | 270 | #### `function tradeBalances(address tokenGet, uint amountGet, address tokenGive, uint amountGive, address user, uint amount) private` 271 | This is a private function and is only being called from trade(). 272 | Handles the movement of funds when a trade occurs. 273 | Takes fees. 274 | Updates token balances for both buyer and seller. 275 | Note: tokenGet & tokenGive can be the Ethereum contract address. 276 | Note: amount is in amountGet / tokenGet terms. 277 | @param tokenGet Ethereum contract address of the token to receive 278 | @param amountGet uint amount of tokens being received 279 | @param tokenGive Ethereum contract address of the token to give 280 | @param amountGive uint amount of tokens being given 281 | @param user Ethereum address of the user who placed the order 282 | @param amount uint amount in terms of tokenGet that will be "buy" in the trade 283 | 284 | #### `function testTrade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s, uint amount, address sender) public constant returns(bool)` 285 | This function is to test if a trade would go through. 286 | Note: tokenGet & tokenGive can be the Ethereum contract address. 287 | Note: amount is in amountGet / tokenGet terms. 288 | @param tokenGet Ethereum contract address of the token to receive 289 | @param amountGet uint amount of tokens being received 290 | @param tokenGive Ethereum contract address of the token to give 291 | @param amountGive uint amount of tokens being given 292 | @param expires uint of block number when this order should expire 293 | @param nonce arbitrary random number 294 | @param user Ethereum address of the user who placed the order 295 | @param v part of signature for the order hash as signed by user 296 | @param r part of signature for the order hash as signed by user 297 | @param s part of signature for the order hash as signed by user 298 | @param amount uint amount in terms of tokenGet that will be "buy" in the trade 299 | @param sender Ethereum address of the user taking the order 300 | @return bool: true if the trade would be successful, false otherwise 301 | 302 | #### `function availableVolume(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s) public constant returns(uint)` 303 | This function checks the available volume for a given order. 304 | Note: tokenGet & tokenGive can be the Ethereum contract address. 305 | @param tokenGet Ethereum contract address of the token to receive 306 | @param amountGet uint amount of tokens being received 307 | @param tokenGive Ethereum contract address of the token to give 308 | @param amountGive uint amount of tokens being given 309 | @param expires uint of block number when this order should expire 310 | @param nonce arbitrary random number 311 | @param user Ethereum address of the user who placed the order 312 | @param v part of signature for the order hash as signed by user 313 | @param r part of signature for the order hash as signed by user 314 | @param s part of signature for the order hash as signed by user 315 | @return uint: amount of volume available for the given order in terms of amountGet / tokenGet 316 | 317 | #### `function amountFilled(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s) public constant returns(uint)` 318 | This function checks the amount of an order that has already been filled. 319 | Note: tokenGet & tokenGive can be the Ethereum contract address. 320 | @param tokenGet Ethereum contract address of the token to receive 321 | @param amountGet uint amount of tokens being received 322 | @param tokenGive Ethereum contract address of the token to give 323 | @param amountGive uint amount of tokens being given 324 | @param expires uint of block number when this order should expire 325 | @param nonce arbitrary random number 326 | @param user Ethereum address of the user who placed the order 327 | @param v part of signature for the order hash as signed by user 328 | @param r part of signature for the order hash as signed by user 329 | @param s part of signature for the order hash as signed by user 330 | @return uint: amount of the given order that has already been filled in terms of amountGet / tokenGet 331 | 332 | #### `function cancelOrder(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, uint8 v, bytes32 r, bytes32 s) public` 333 | This function cancels a given order by editing its fill data to the full amount. 334 | Requires that the transaction is signed properly. 335 | Updates orderFills to the full amountGet 336 | Emits a Cancel event. 337 | Note: tokenGet & tokenGive can be the Ethereum contract address. 338 | @param tokenGet Ethereum contract address of the token to receive 339 | @param amountGet uint amount of tokens being received 340 | @param tokenGive Ethereum contract address of the token to give 341 | @param amountGive uint amount of tokens being given 342 | @param expires uint of block number when this order should expire 343 | @param nonce arbitrary random number 344 | @param user Ethereum address of the user who placed the order 345 | @param v part of signature for the order hash as signed by user 346 | @param r part of signature for the order hash as signed by user 347 | @param s part of signature for the order hash as signed by user 348 | @return uint: amount of the given order that has already been filled in terms of amountGet / tokenGet 349 | 350 | #### `function migrateFunds(address newContract, address[] tokens_) public` 351 | User triggered function to migrate funds into a new contract to ease updates. 352 | Emits a FundsMigrated event. 353 | @param address Contract address of the new contract we are migrating funds to 354 | @param address[] Array of token addresses that we will be migrating to the new contract 355 | 356 | #### `function depositForUser(address user) public payable` 357 | This function handles deposits of Ether into the contract, but allows specification of a user. 358 | Note: This is generally used in migration of funds. 359 | Note: With the payable modifier, this function accepts Ether. 360 | 361 | #### `function depositTokenForUser(address token, uint amount, address user) public` 362 | This function handles deposits of Ethereum based tokens into the contract, but allows specification of a user. 363 | Does not allow Ether. 364 | If token transfer fails, transaction is reverted and remaining gas is refunded. 365 | Note: This is generally used in migration of funds. 366 | Note: With the payable modifier, this function accepts Ether. 367 | Note: Remember to call Token(address).approve(this, amount) or this contract will not be able to do the transfer on your behalf. 368 | @param token Ethereum contract address of the token or 0 for Ether 369 | @param amount uint of the amount of the token the user wishes to deposit 370 | -------------------------------------------------------------------------------- /contracts/ForkDelta.sol: -------------------------------------------------------------------------------- 1 | pragma solidity 0.4.19; 2 | 3 | import "./IToken.sol"; 4 | import "./LSafeMath.sol"; 5 | 6 | /** 7 | * @title ForkDelta 8 | * @dev This is the main contract for the ForkDelta exchange. 9 | */ 10 | contract ForkDelta { 11 | 12 | using LSafeMath for uint; 13 | 14 | /// Variables 15 | address public admin; // the admin address 16 | address public feeAccount; // the account that will receive fees 17 | uint public feeTake; // percentage times (1 ether) 18 | uint public freeUntilDate; // date in UNIX timestamp that trades will be free until 19 | bool private depositingTokenFlag; // True when Token.transferFrom is being called from depositToken 20 | mapping (address => mapping (address => uint)) public tokens; // mapping of token addresses to mapping of account balances (token=0 means Ether) 21 | mapping (address => mapping (bytes32 => bool)) public orders; // mapping of user accounts to mapping of order hashes to booleans (true = submitted by user, equivalent to offchain signature) 22 | mapping (address => mapping (bytes32 => uint)) public orderFills; // mapping of user accounts to mapping of order hashes to uints (amount of order that has been filled) 23 | address public predecessor; // Address of the previous version of this contract. If address(0), this is the first version 24 | address public successor; // Address of the next version of this contract. If address(0), this is the most up to date version. 25 | uint16 public version; // This is the version # of the contract 26 | 27 | /// Logging Events 28 | event Order(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user); 29 | event Cancel(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s); 30 | event Trade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, address get, address give); 31 | event Deposit(address token, address user, uint amount, uint balance); 32 | event Withdraw(address token, address user, uint amount, uint balance); 33 | event FundsMigrated(address user, address newContract); 34 | 35 | /// This is a modifier for functions to check if the sending user address is the same as the admin user address. 36 | modifier isAdmin() { 37 | require(msg.sender == admin); 38 | _; 39 | } 40 | 41 | /// Constructor function. This is only called on contract creation. 42 | function ForkDelta(address admin_, address feeAccount_, uint feeTake_, uint freeUntilDate_, address predecessor_) public { 43 | admin = admin_; 44 | feeAccount = feeAccount_; 45 | feeTake = feeTake_; 46 | freeUntilDate = freeUntilDate_; 47 | depositingTokenFlag = false; 48 | predecessor = predecessor_; 49 | 50 | if (predecessor != address(0)) { 51 | version = ForkDelta(predecessor).version() + 1; 52 | } else { 53 | version = 1; 54 | } 55 | } 56 | 57 | /// The fallback function. Ether transfered into the contract is not accepted. 58 | function() public { 59 | revert(); 60 | } 61 | 62 | /// Changes the official admin user address. Accepts Ethereum address. 63 | function changeAdmin(address admin_) public isAdmin { 64 | require(admin_ != address(0)); 65 | admin = admin_; 66 | } 67 | 68 | /// Changes the account address that receives trading fees. Accepts Ethereum address. 69 | function changeFeeAccount(address feeAccount_) public isAdmin { 70 | feeAccount = feeAccount_; 71 | } 72 | 73 | /// Changes the fee on takes. Can only be changed to a value less than it is currently set at. 74 | function changeFeeTake(uint feeTake_) public isAdmin { 75 | require(feeTake_ <= feeTake); 76 | feeTake = feeTake_; 77 | } 78 | 79 | /// Changes the date that trades are free until. Accepts UNIX timestamp. 80 | function changeFreeUntilDate(uint freeUntilDate_) public isAdmin { 81 | freeUntilDate = freeUntilDate_; 82 | } 83 | 84 | /// Changes the successor. Used in updating the contract. 85 | function setSuccessor(address successor_) public isAdmin { 86 | require(successor_ != address(0)); 87 | successor = successor_; 88 | } 89 | 90 | //////////////////////////////////////////////////////////////////////////////// 91 | // Deposits, Withdrawals, Balances 92 | //////////////////////////////////////////////////////////////////////////////// 93 | 94 | /** 95 | * This function handles deposits of Ether into the contract. 96 | * Emits a Deposit event. 97 | * Note: With the payable modifier, this function accepts Ether. 98 | */ 99 | function deposit() public payable { 100 | tokens[0][msg.sender] = tokens[0][msg.sender].add(msg.value); 101 | Deposit(0, msg.sender, msg.value, tokens[0][msg.sender]); 102 | } 103 | 104 | /** 105 | * This function handles withdrawals of Ether from the contract. 106 | * Verifies that the user has enough funds to cover the withdrawal. 107 | * Emits a Withdraw event. 108 | * @param amount uint of the amount of Ether the user wishes to withdraw 109 | */ 110 | function withdraw(uint amount) public { 111 | require(tokens[0][msg.sender] >= amount); 112 | tokens[0][msg.sender] = tokens[0][msg.sender].sub(amount); 113 | msg.sender.transfer(amount); 114 | Withdraw(0, msg.sender, amount, tokens[0][msg.sender]); 115 | } 116 | 117 | /** 118 | * This function handles deposits of Ethereum based tokens to the contract. 119 | * Does not allow Ether. 120 | * If token transfer fails, transaction is reverted and remaining gas is refunded. 121 | * Emits a Deposit event. 122 | * Note: Remember to call Token(address).approve(this, amount) or this contract will not be able to do the transfer on your behalf. 123 | * @param token Ethereum contract address of the token or 0 for Ether 124 | * @param amount uint of the amount of the token the user wishes to deposit 125 | */ 126 | function depositToken(address token, uint amount) public { 127 | require(token != 0); 128 | depositingTokenFlag = true; 129 | require(IToken(token).transferFrom(msg.sender, this, amount)); 130 | depositingTokenFlag = false; 131 | tokens[token][msg.sender] = tokens[token][msg.sender].add(amount); 132 | Deposit(token, msg.sender, amount, tokens[token][msg.sender]); 133 | } 134 | 135 | /** 136 | * This function provides a fallback solution as outlined in ERC223. 137 | * If tokens are deposited through depositToken(), the transaction will continue. 138 | * If tokens are sent directly to this contract, the transaction is reverted. 139 | * @param sender Ethereum address of the sender of the token 140 | * @param amount amount of the incoming tokens 141 | * @param data attached data similar to msg.data of Ether transactions 142 | */ 143 | function tokenFallback( address sender, uint amount, bytes data) public returns (bool ok) { 144 | if (depositingTokenFlag) { 145 | // Transfer was initiated from depositToken(). User token balance will be updated there. 146 | return true; 147 | } else { 148 | // Direct ECR223 Token.transfer into this contract not allowed, to keep it consistent 149 | // with direct transfers of ECR20 and ETH. 150 | revert(); 151 | } 152 | } 153 | 154 | /** 155 | * This function handles withdrawals of Ethereum based tokens from the contract. 156 | * Does not allow Ether. 157 | * If token transfer fails, transaction is reverted and remaining gas is refunded. 158 | * Emits a Withdraw event. 159 | * @param token Ethereum contract address of the token or 0 for Ether 160 | * @param amount uint of the amount of the token the user wishes to withdraw 161 | */ 162 | function withdrawToken(address token, uint amount) public { 163 | require(token != 0); 164 | require(tokens[token][msg.sender] >= amount); 165 | tokens[token][msg.sender] = tokens[token][msg.sender].sub(amount); 166 | require(IToken(token).transfer(msg.sender, amount)); 167 | Withdraw(token, msg.sender, amount, tokens[token][msg.sender]); 168 | } 169 | 170 | /** 171 | * Retrieves the balance of a token based on a user address and token address. 172 | * @param token Ethereum contract address of the token or 0 for Ether 173 | * @param user Ethereum address of the user 174 | * @return the amount of tokens on the exchange for a given user address 175 | */ 176 | function balanceOf(address token, address user) public constant returns (uint) { 177 | return tokens[token][user]; 178 | } 179 | 180 | //////////////////////////////////////////////////////////////////////////////// 181 | // Trading 182 | //////////////////////////////////////////////////////////////////////////////// 183 | 184 | /** 185 | * Stores the active order inside of the contract. 186 | * Emits an Order event. 187 | * Note: tokenGet & tokenGive can be the Ethereum contract address. 188 | * @param tokenGet Ethereum contract address of the token to receive 189 | * @param amountGet uint amount of tokens being received 190 | * @param tokenGive Ethereum contract address of the token to give 191 | * @param amountGive uint amount of tokens being given 192 | * @param expires uint of block number when this order should expire 193 | * @param nonce arbitrary random number 194 | */ 195 | function order(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce) public { 196 | bytes32 hash = sha256(this, tokenGet, amountGet, tokenGive, amountGive, expires, nonce); 197 | orders[msg.sender][hash] = true; 198 | Order(tokenGet, amountGet, tokenGive, amountGive, expires, nonce, msg.sender); 199 | } 200 | 201 | /** 202 | * Facilitates a trade from one user to another. 203 | * Requires that the transaction is signed properly, the trade isn't past its expiration, and all funds are present to fill the trade. 204 | * Calls tradeBalances(). 205 | * Updates orderFills with the amount traded. 206 | * Emits a Trade event. 207 | * Note: tokenGet & tokenGive can be the Ethereum contract address. 208 | * Note: amount is in amountGet / tokenGet terms. 209 | * @param tokenGet Ethereum contract address of the token to receive 210 | * @param amountGet uint amount of tokens being received 211 | * @param tokenGive Ethereum contract address of the token to give 212 | * @param amountGive uint amount of tokens being given 213 | * @param expires uint of block number when this order should expire 214 | * @param nonce arbitrary random number 215 | * @param user Ethereum address of the user who placed the order 216 | * @param v part of signature for the order hash as signed by user 217 | * @param r part of signature for the order hash as signed by user 218 | * @param s part of signature for the order hash as signed by user 219 | * @param amount uint amount in terms of tokenGet that will be "buy" in the trade 220 | */ 221 | function trade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s, uint amount) public { 222 | bytes32 hash = sha256(this, tokenGet, amountGet, tokenGive, amountGive, expires, nonce); 223 | require(( 224 | (orders[user][hash] || ecrecover(keccak256("\x19Ethereum Signed Message:\n32", hash), v, r, s) == user) && 225 | block.number <= expires && 226 | orderFills[user][hash].add(amount) <= amountGet 227 | )); 228 | tradeBalances(tokenGet, amountGet, tokenGive, amountGive, user, amount); 229 | orderFills[user][hash] = orderFills[user][hash].add(amount); 230 | Trade(tokenGet, amount, tokenGive, amountGive.mul(amount) / amountGet, user, msg.sender); 231 | } 232 | 233 | /** 234 | * This is a private function and is only being called from trade(). 235 | * Handles the movement of funds when a trade occurs. 236 | * Takes fees. 237 | * Updates token balances for both buyer and seller. 238 | * Note: tokenGet & tokenGive can be the Ethereum contract address. 239 | * Note: amount is in amountGet / tokenGet terms. 240 | * @param tokenGet Ethereum contract address of the token to receive 241 | * @param amountGet uint amount of tokens being received 242 | * @param tokenGive Ethereum contract address of the token to give 243 | * @param amountGive uint amount of tokens being given 244 | * @param user Ethereum address of the user who placed the order 245 | * @param amount uint amount in terms of tokenGet that will be "buy" in the trade 246 | */ 247 | function tradeBalances(address tokenGet, uint amountGet, address tokenGive, uint amountGive, address user, uint amount) private { 248 | 249 | uint feeTakeXfer = 0; 250 | 251 | if (now >= freeUntilDate) { 252 | feeTakeXfer = amount.mul(feeTake).div(1 ether); 253 | } 254 | 255 | tokens[tokenGet][msg.sender] = tokens[tokenGet][msg.sender].sub(amount.add(feeTakeXfer)); 256 | tokens[tokenGet][user] = tokens[tokenGet][user].add(amount); 257 | tokens[tokenGet][feeAccount] = tokens[tokenGet][feeAccount].add(feeTakeXfer); 258 | tokens[tokenGive][user] = tokens[tokenGive][user].sub(amountGive.mul(amount).div(amountGet)); 259 | tokens[tokenGive][msg.sender] = tokens[tokenGive][msg.sender].add(amountGive.mul(amount).div(amountGet)); 260 | } 261 | 262 | /** 263 | * This function is to test if a trade would go through. 264 | * Note: tokenGet & tokenGive can be the Ethereum contract address. 265 | * Note: amount is in amountGet / tokenGet terms. 266 | * @param tokenGet Ethereum contract address of the token to receive 267 | * @param amountGet uint amount of tokens being received 268 | * @param tokenGive Ethereum contract address of the token to give 269 | * @param amountGive uint amount of tokens being given 270 | * @param expires uint of block number when this order should expire 271 | * @param nonce arbitrary random number 272 | * @param user Ethereum address of the user who placed the order 273 | * @param v part of signature for the order hash as signed by user 274 | * @param r part of signature for the order hash as signed by user 275 | * @param s part of signature for the order hash as signed by user 276 | * @param amount uint amount in terms of tokenGet that will be "buy" in the trade 277 | * @param sender Ethereum address of the user taking the order 278 | * @return bool: true if the trade would be successful, false otherwise 279 | */ 280 | function testTrade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s, uint amount, address sender) public constant returns(bool) { 281 | if (!( 282 | tokens[tokenGet][sender] >= amount && 283 | availableVolume(tokenGet, amountGet, tokenGive, amountGive, expires, nonce, user, v, r, s) >= amount 284 | )) { 285 | return false; 286 | } else { 287 | return true; 288 | } 289 | } 290 | 291 | /** 292 | * This function checks the available volume for a given order. 293 | * Note: tokenGet & tokenGive can be the Ethereum contract address. 294 | * @param tokenGet Ethereum contract address of the token to receive 295 | * @param amountGet uint amount of tokens being received 296 | * @param tokenGive Ethereum contract address of the token to give 297 | * @param amountGive uint amount of tokens being given 298 | * @param expires uint of block number when this order should expire 299 | * @param nonce arbitrary random number 300 | * @param user Ethereum address of the user who placed the order 301 | * @param v part of signature for the order hash as signed by user 302 | * @param r part of signature for the order hash as signed by user 303 | * @param s part of signature for the order hash as signed by user 304 | * @return uint: amount of volume available for the given order in terms of amountGet / tokenGet 305 | */ 306 | function availableVolume(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s) public constant returns(uint) { 307 | bytes32 hash = sha256(this, tokenGet, amountGet, tokenGive, amountGive, expires, nonce); 308 | if (!( 309 | (orders[user][hash] || ecrecover(keccak256("\x19Ethereum Signed Message:\n32", hash), v, r, s) == user) && 310 | block.number <= expires 311 | )) { 312 | return 0; 313 | } 314 | uint[2] memory available; 315 | available[0] = amountGet.sub(orderFills[user][hash]); 316 | available[1] = tokens[tokenGive][user].mul(amountGet) / amountGive; 317 | if (available[0] < available[1]) { 318 | return available[0]; 319 | } else { 320 | return available[1]; 321 | } 322 | } 323 | 324 | /** 325 | * This function checks the amount of an order that has already been filled. 326 | * Note: tokenGet & tokenGive can be the Ethereum contract address. 327 | * @param tokenGet Ethereum contract address of the token to receive 328 | * @param amountGet uint amount of tokens being received 329 | * @param tokenGive Ethereum contract address of the token to give 330 | * @param amountGive uint amount of tokens being given 331 | * @param expires uint of block number when this order should expire 332 | * @param nonce arbitrary random number 333 | * @param user Ethereum address of the user who placed the order 334 | * @param v part of signature for the order hash as signed by user 335 | * @param r part of signature for the order hash as signed by user 336 | * @param s part of signature for the order hash as signed by user 337 | * @return uint: amount of the given order that has already been filled in terms of amountGet / tokenGet 338 | */ 339 | function amountFilled(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s) public constant returns(uint) { 340 | bytes32 hash = sha256(this, tokenGet, amountGet, tokenGive, amountGive, expires, nonce); 341 | return orderFills[user][hash]; 342 | } 343 | 344 | /** 345 | * This function cancels a given order by editing its fill data to the full amount. 346 | * Requires that the transaction is signed properly. 347 | * Updates orderFills to the full amountGet 348 | * Emits a Cancel event. 349 | * Note: tokenGet & tokenGive can be the Ethereum contract address. 350 | * @param tokenGet Ethereum contract address of the token to receive 351 | * @param amountGet uint amount of tokens being received 352 | * @param tokenGive Ethereum contract address of the token to give 353 | * @param amountGive uint amount of tokens being given 354 | * @param expires uint of block number when this order should expire 355 | * @param nonce arbitrary random number 356 | * @param v part of signature for the order hash as signed by user 357 | * @param r part of signature for the order hash as signed by user 358 | * @param s part of signature for the order hash as signed by user 359 | * @return uint: amount of the given order that has already been filled in terms of amountGet / tokenGet 360 | */ 361 | function cancelOrder(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, uint8 v, bytes32 r, bytes32 s) public { 362 | bytes32 hash = sha256(this, tokenGet, amountGet, tokenGive, amountGive, expires, nonce); 363 | require ((orders[msg.sender][hash] || ecrecover(keccak256("\x19Ethereum Signed Message:\n32", hash), v, r, s) == msg.sender)); 364 | orderFills[msg.sender][hash] = amountGet; 365 | Cancel(tokenGet, amountGet, tokenGive, amountGive, expires, nonce, msg.sender, v, r, s); 366 | } 367 | 368 | 369 | 370 | //////////////////////////////////////////////////////////////////////////////// 371 | // Contract Versioning / Migration 372 | //////////////////////////////////////////////////////////////////////////////// 373 | 374 | /** 375 | * User triggered function to migrate funds into a new contract to ease updates. 376 | * Emits a FundsMigrated event. 377 | * @param newContract Contract address of the new contract we are migrating funds to 378 | * @param tokens_ Array of token addresses that we will be migrating to the new contract 379 | */ 380 | function migrateFunds(address newContract, address[] tokens_) public { 381 | 382 | require(newContract != address(0)); 383 | 384 | ForkDelta newExchange = ForkDelta(newContract); 385 | 386 | // Move Ether into new exchange. 387 | uint etherAmount = tokens[0][msg.sender]; 388 | if (etherAmount > 0) { 389 | tokens[0][msg.sender] = 0; 390 | newExchange.depositForUser.value(etherAmount)(msg.sender); 391 | } 392 | 393 | // Move Tokens into new exchange. 394 | for (uint16 n = 0; n < tokens_.length; n++) { 395 | address token = tokens_[n]; 396 | require(token != address(0)); // Ether is handled above. 397 | uint tokenAmount = tokens[token][msg.sender]; 398 | 399 | if (tokenAmount != 0) { 400 | require(IToken(token).approve(newExchange, tokenAmount)); 401 | tokens[token][msg.sender] = 0; 402 | newExchange.depositTokenForUser(token, tokenAmount, msg.sender); 403 | } 404 | } 405 | 406 | FundsMigrated(msg.sender, newContract); 407 | } 408 | 409 | /** 410 | * This function handles deposits of Ether into the contract, but allows specification of a user. 411 | * Note: This is generally used in migration of funds. 412 | * Note: With the payable modifier, this function accepts Ether. 413 | */ 414 | function depositForUser(address user) public payable { 415 | require(user != address(0)); 416 | require(msg.value > 0); 417 | tokens[0][user] = tokens[0][user].add(msg.value); 418 | } 419 | 420 | /** 421 | * This function handles deposits of Ethereum based tokens into the contract, but allows specification of a user. 422 | * Does not allow Ether. 423 | * If token transfer fails, transaction is reverted and remaining gas is refunded. 424 | * Note: This is generally used in migration of funds. 425 | * Note: Remember to call Token(address).approve(this, amount) or this contract will not be able to do the transfer on your behalf. 426 | * @param token Ethereum contract address of the token 427 | * @param amount uint of the amount of the token the user wishes to deposit 428 | */ 429 | function depositTokenForUser(address token, uint amount, address user) public { 430 | require(token != address(0)); 431 | require(user != address(0)); 432 | require(amount > 0); 433 | depositingTokenFlag = true; 434 | require(IToken(token).transferFrom(msg.sender, this, amount)); 435 | depositingTokenFlag = false; 436 | tokens[token][user] = tokens[token][user].add(amount); 437 | } 438 | 439 | } -------------------------------------------------------------------------------- /contracts/IToken.sol: -------------------------------------------------------------------------------- 1 | pragma solidity 0.4.19; 2 | 3 | /** 4 | * @title Token 5 | * @dev Token interface necessary for working with tokens within the exchange contract. 6 | */ 7 | contract IToken { 8 | /// @return total amount of tokens 9 | function totalSupply() public constant returns (uint256 supply) {} 10 | 11 | /// @param _owner The address from which the balance will be retrieved 12 | /// @return The balance 13 | function balanceOf(address _owner) public constant returns (uint256 balance) {} 14 | 15 | /// @notice send `_value` token to `_to` from `msg.sender` 16 | /// @param _to The address of the recipient 17 | /// @param _value The amount of token to be transferred 18 | /// @return Whether the transfer was successful or not 19 | function transfer(address _to, uint256 _value) public returns (bool success) {} 20 | 21 | /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from` 22 | /// @param _from The address of the sender 23 | /// @param _to The address of the recipient 24 | /// @param _value The amount of token to be transferred 25 | /// @return Whether the transfer was successful or not 26 | function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {} 27 | 28 | /// @notice `msg.sender` approves `_addr` to spend `_value` tokens 29 | /// @param _spender The address of the account able to transfer the tokens 30 | /// @param _value The amount of wei to be approved for transfer 31 | /// @return Whether the approval was successful or not 32 | function approve(address _spender, uint256 _value) public returns (bool success) {} 33 | 34 | /// @param _owner The address of the account owning tokens 35 | /// @param _spender The address of the account able to transfer the tokens 36 | /// @return Amount of remaining tokens allowed to spent 37 | function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {} 38 | 39 | event Transfer(address indexed _from, address indexed _to, uint256 _value); 40 | event Approval(address indexed _owner, address indexed _spender, uint256 _value); 41 | 42 | uint public decimals; 43 | string public name; 44 | } -------------------------------------------------------------------------------- /contracts/LSafeMath.sol: -------------------------------------------------------------------------------- 1 | pragma solidity 0.4.19; 2 | 3 | /** 4 | * @title SafeMath 5 | * @dev Math operations with safety checks that throw on error 6 | */ 7 | library LSafeMath { 8 | 9 | /** 10 | * @dev Multiplies two numbers, throws on overflow. 11 | */ 12 | function mul(uint256 a, uint256 b) internal pure returns (uint256) { 13 | if (a == 0) { 14 | return 0; 15 | } 16 | uint256 c = a * b; 17 | require(c / a == b); 18 | return c; 19 | } 20 | 21 | /** 22 | * @dev Integer division of two numbers, truncating the quotient. 23 | */ 24 | function div(uint256 a, uint256 b) internal pure returns (uint256) { 25 | require(b > 0); // Solidity automatically throws when dividing by 0 26 | uint256 c = a / b; 27 | // assert(a == b * c + a % b); // There is no case in which this doesn't hold 28 | return c; 29 | } 30 | 31 | /** 32 | * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). 33 | */ 34 | function sub(uint256 a, uint256 b) internal pure returns (uint256) { 35 | require(b <= a); 36 | return a - b; 37 | } 38 | 39 | /** 40 | * @dev Adds two numbers, throws on overflow. 41 | */ 42 | function add(uint256 a, uint256 b) internal pure returns (uint256) { 43 | uint256 c = a + b; 44 | require(c >= a); 45 | return c; 46 | } 47 | } -------------------------------------------------------------------------------- /contracts/Migrations.sol: -------------------------------------------------------------------------------- 1 | pragma solidity 0.4.19; 2 | 3 | contract Migrations { 4 | address public owner; 5 | uint public last_completed_migration; 6 | 7 | modifier restricted() { 8 | if (msg.sender == owner) _; 9 | } 10 | 11 | function Migrations() public { 12 | owner = msg.sender; 13 | } 14 | 15 | function setCompleted(uint completed) public restricted { 16 | last_completed_migration = completed; 17 | } 18 | 19 | function upgrade(address new_address) public restricted { 20 | Migrations upgraded = Migrations(new_address); 21 | upgraded.setCompleted(last_completed_migration); 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /contracts/test/SampleToken.sol: -------------------------------------------------------------------------------- 1 | pragma solidity 0.4.19; 2 | 3 | contract ITokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); } 4 | 5 | contract SampleToken { 6 | /* Public variables of the token */ 7 | string public standard = "Token 0.1"; 8 | string public name; 9 | string public symbol; 10 | uint8 public decimals; 11 | uint256 public totalSupply; 12 | 13 | /* This creates an array with all balances */ 14 | mapping (address => uint256) public balanceOf; 15 | mapping (address => mapping (address => uint256)) public allowance; 16 | 17 | /* This generates a public event on the blockchain that will notify clients */ 18 | event Transfer(address indexed from, address indexed to, uint256 value); 19 | 20 | /* This notifies clients about the amount burnt */ 21 | event Burn(address indexed from, uint256 value); 22 | 23 | /* Initializes contract with initial supply tokens to the creator of the contract */ 24 | function SampleToken( 25 | uint256 initialSupply, 26 | string tokenName, 27 | uint8 decimalUnits, 28 | string tokenSymbol 29 | ) { 30 | balanceOf[msg.sender] = initialSupply; // Give the creator all initial tokens 31 | totalSupply = initialSupply; // Update total supply 32 | name = tokenName; // Set the name for display purposes 33 | symbol = tokenSymbol; // Set the symbol for display purposes 34 | decimals = decimalUnits; // Amount of decimals for display purposes 35 | } 36 | 37 | /* Send coins */ 38 | function transfer(address _to, uint256 _value) { 39 | if (_to == 0x0) revert(); // Prevent transfer to 0x0 address. Use burn() instead 40 | if (balanceOf[msg.sender] < _value) revert(); // Check if the sender has enough 41 | if (balanceOf[_to] + _value < balanceOf[_to]) revert(); // Check for overflows 42 | balanceOf[msg.sender] -= _value; // Subtract from the sender 43 | balanceOf[_to] += _value; // Add the same to the recipient 44 | Transfer(msg.sender, _to, _value); // Notify anyone listening that this transfer took place 45 | } 46 | 47 | /* Allow another contract to spend some tokens in your behalf */ 48 | function approve(address _spender, uint256 _value) 49 | returns (bool success) { 50 | allowance[msg.sender][_spender] = _value; 51 | return true; 52 | } 53 | 54 | /* Approve and then communicate the approved contract in a single tx */ 55 | function approveAndCall(address _spender, uint256 _value, bytes _extraData) 56 | returns (bool success) { 57 | ITokenRecipient spender = ITokenRecipient(_spender); 58 | if (approve(_spender, _value)) { 59 | spender.receiveApproval(msg.sender, _value, this, _extraData); 60 | return true; 61 | } 62 | } 63 | 64 | /* A contract attempts to get the coins */ 65 | function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { 66 | if (_to == 0x0) revert(); // Prevent transfer to 0x0 address. Use burn() instead 67 | if (balanceOf[_from] < _value) revert(); // Check if the sender has enough 68 | if (balanceOf[_to] + _value < balanceOf[_to]) revert(); // Check for overflows 69 | if (_value > allowance[_from][msg.sender]) revert(); // Check allowance 70 | balanceOf[_from] -= _value; // Subtract from the sender 71 | balanceOf[_to] += _value; // Add the same to the recipient 72 | allowance[_from][msg.sender] -= _value; 73 | Transfer(_from, _to, _value); 74 | return true; 75 | } 76 | 77 | function burn(uint256 _value) returns (bool success) { 78 | if (balanceOf[msg.sender] < _value) revert(); // Check if the sender has enough 79 | balanceOf[msg.sender] -= _value; // Subtract from the sender 80 | totalSupply -= _value; // Updates totalSupply 81 | Burn(msg.sender, _value); 82 | return true; 83 | } 84 | 85 | function burnFrom(address _from, uint256 _value) returns (bool success) { 86 | if (balanceOf[_from] < _value) revert(); // Check if the sender has enough 87 | if (_value > allowance[_from][msg.sender]) revert(); // Check allowance 88 | balanceOf[_from] -= _value; // Subtract from the sender 89 | totalSupply -= _value; // Updates totalSupply 90 | Burn(_from, _value); 91 | return true; 92 | } 93 | } -------------------------------------------------------------------------------- /migrations/1_initial_migration.js: -------------------------------------------------------------------------------- 1 | var Migrations = artifacts.require("./Migrations.sol"); 2 | 3 | module.exports = function(deployer) { 4 | deployer.deploy(Migrations); 5 | }; 6 | -------------------------------------------------------------------------------- /migrations/2_deploy_contracts.js: -------------------------------------------------------------------------------- 1 | var ForkDelta = artifacts.require("./ForkDelta.sol"); 2 | var LSafeMath = artifacts.require("./LSafeMath.sol"); 3 | 4 | var SampleToken = artifacts.require("./test/SampleToken.sol"); 5 | 6 | module.exports = function(deployer, network, accounts) { 7 | 8 | if (network == "develop" || network == "development") { 9 | admin = accounts[1] 10 | feeAccount = accounts[2]; 11 | feeMake = 0; 12 | feeTake = 3000000000000000; 13 | freeUntilDate= 0; 14 | deployer.deploy(SampleToken, 100000000*1000000000000000000 , "SampleToken", 18, "SMPL"); 15 | } 16 | 17 | if (network == "live" || network == "production") { 18 | //TODO: set admin and fee accounts for production 19 | admin = null 20 | feeAccount = null; 21 | feeMake = 0; 22 | feeTake = 3000000000000000; 23 | freeUntilDate= 0; 24 | } 25 | 26 | deployer.deploy(LSafeMath); 27 | deployer.link(LSafeMath, ForkDelta); 28 | deployer.deploy(ForkDelta, admin, feeAccount, feeMake, feeTake, freeUntilDate); 29 | } 30 | 31 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "forkdelta_smart_contract", 3 | "version": "0.0.1", 4 | "license": "GPL-3.0", 5 | "repository": { 6 | "type": "git", 7 | "url": "https://github.com/forkdelta/smart_contract" 8 | }, 9 | "require": [ 10 | "babel-register", 11 | "babel-polyfill" 12 | ], 13 | "dependencies": { 14 | "async": "^2.6.0", 15 | "babel-polyfill": "^6.26.0", 16 | "babel-preset-es2015": "^6.18.0", 17 | "babel-preset-stage-2": "^6.24.1", 18 | "babel-preset-stage-3": "^6.17.0", 19 | "babel-register": "^6.23.0", 20 | "bignumber.js": "^6.0.0", 21 | "ethereumjs-tx": "^1.3.4", 22 | "js-sha256": "^0.9.0", 23 | "web3": "^0.18.2" 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /test/ForkDelta.js: -------------------------------------------------------------------------------- 1 | 2 | var BigNumber = require('bignumber.js'); 3 | var ForkDelta = artifacts.require("./ForkDelta.sol"); 4 | 5 | const ether=1000000000000000000; 6 | const gwei =1000000000; 7 | 8 | /* 9 | Accounts: 10 | (0) 0x627306090abab3a6e1400e9345bc60c78a8bef57 Main account 11 | (1) 0xf17f52151ebef6c7334fad080c5704d77216b732 12 | (2) 0xc5fdf4076b8f3a5357c5e395ab970b5b54098fef 13 | (3) 0x821aea9a577a9b44299b9c15c88cf3087f3b5544 14 | (4) 0x0d1d4e623d10f9fba5db95830f7d3839406c6af2 15 | (5) 0x2932b7a2355d6fecc4b5c0b6bd44cc31df247a2e 16 | (6) 0x2191ef87e392377ec08e7c08eb105ef5448eced5 17 | (7) 0x0f4f2ac550a1b4e2280d04c21cea7ebd822934b5 18 | (8) 0x6330a553fc93768f612722bb8c2ec78ac90b3bbc 19 | (9) 0x5aeda56215b167893e80b4fe645ba6d5bab767de 20 | */ 21 | 22 | contract('ForkDelta', function(accounts) { 23 | 24 | 25 | before(async () => { 26 | // 27 | }); 28 | 29 | it("Dummy ok check", async () => { 30 | assert.equal(1, 1, 'One is still one'); 31 | }); 32 | 33 | }); 34 | -------------------------------------------------------------------------------- /truffle.js: -------------------------------------------------------------------------------- 1 | 2 | require('babel-register'); 3 | require('babel-polyfill'); 4 | 5 | module.exports = { 6 | networks: { 7 | 8 | development: { 9 | host: "localhost", 10 | port: 7545, 11 | network_id: "5777" 12 | }, 13 | 14 | live: { 15 | network_id: 1, 16 | host: "localhost", 17 | port: 8545, 18 | //from: "", // default address to use for any transaction Truffle makes during migrations 19 | gas: 5000000, // Gas limit used for deployments 20 | gasPrice: 20000000000 //20 Gwei 21 | }, 22 | }, 23 | 24 | mocha: { 25 | useColors: true, 26 | slow: 5000 27 | } 28 | }; 29 | 30 | --------------------------------------------------------------------------------