• ERC721 contact address which will be served
• Contract which will act as an Escrow where the funds will be stored
• This contract needs to be set as an operator in order to handle the transfer from the actual owner of the token to the msg.sender
• fill in your .env file as per the example provided in env.example

This is a ERC721 compatible contract. It represents a contract, deployed on Polygon(MATIC) which accepts ERC20 tokens as a payment method and will take care for transferring ERC721 tokens to the msg.sender. NomoPlayersDropMechanic transfers 20% of the funds, in the form of ERC20 tokens, sent to DAO wallet address and 80% to Strategy contract. NomoPlayersDropMechanic contract possesses presale functionality, which gives the right to whitelisted users to purchase token in particular presale period of time, before the actual sale has started. The tokens array of ids passed into the constructor function in NomoPlayersDropMechanic contract, consists of n number of tokens, which are shuffled before the contract is deployed. The order of all token ids in the tokens array is intentionally hidden, in order the relation between index and id to be kept unclear in order to lower the change of malicious attack as much as possible.

In order the contract to be deployed properly, the contract will require:

• an array of the token id's, shuffled before the contract is deployed.
• erc721Address - address of the associated ERC721 contract instance.
• tokens vault - As this contract is not meant to be an owner at any given time, it'll need the original owner which the NomoPlayersDropMechanic contract will transfer the tokens from.
• token price - token price is intended to be paid from the user, in order to "buy" an NFT. The validation is something in top, but that's not the general purpose of the tokenPrice.
• maximum quantity - will be used for the maximum quantity of tokens which is possible to be bought per transaction.

In order the contract functions to operate, the contract will require:

• erc20 contract address to be set in setERC20Address - address of the associated ERC20 contract instance.
• Strategy contract address to be set in setStrategyContractAddress - address where 80% of the funds are going be to sent to.
• DAO wallet address to be set in setDaoWalletAddress - address where 20% of the funds are going be to sent to.

For more details refer to the white paper white paper.

In order the contract presale functionality to operate properly, the contract will require:

• presaleStartDate to be set in setPresaleStartDate - uint256 representing the start date of the presale period.
• presaleDuration to be set in setPresaleDuration - uint256 representing the duration of the presale.
• whitelisted addresses to be set in setWhitelisted - address[] representing the users who will have the chance to redeem 1 token at most during the presale period.

It's as simple as running

npm install

To deploy instances of the contracts for local development without prior knowledge to Hardhat, first copy .env.example to .env and run the following command:

npm run deploy

This command starts up built-in Hardhat Network and migrates all contracts to the Hardhat Network instance.

If preferred by those who are familiar with Hardhat, the standard Hardhat commands can be used. Ganache can be started up manually by configuring a local network to be run against or using the hardhat-ganache plugin or you could start a Hardhat Network using npx hardhat node. For more information on how this can be achieved refer to the official Hardhat documentation

In a separate terminal, contracts can be deployed using

  npx hardhat --network [customNetworkName] deploy

The NomoPlayersDropMechanic contract is thoroughly unit tested using Hardhat's testing framework support. To run the unit tests:

npx hardhat test

The unit tests encompass the happy path of transferring tokens as well as expected reverts. By default, the build system automates starting and stopping Hardhat Network on port http://localhost:8545 in the background ready for each test run.

We use solidity-coverage to provide test coverage reports. In order to have our contract fully tested and prepared for Matic Mainnet we made sure that our line of the contract is covered with a test and lays on 100% coverage. In order this to be verified run:

npx hardhat coverage

NomoPlayersDropMechanic.sol

• Deploys the NomoPlayersDropMechanic contract
• Initializes the contract with the provided:
  • tokens: uint256[]
  • erc721Address: address
  • tokensVault: address
  • tokenPrice: uint256
  • maxQuantity: uint256

The default network this will be deployed on is Mumbai Testnet. Once the below command is run, the contract address will be stored in ./contracts.json

npm run contracts:migrate:dev

The below command will take the contracts from ./contracts.json and will try to verify them on the default network.

npm run contracts:verify:dev

This project is licensed under the Apache License 2.0 license.