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licenseContract

This is a smart contract aims to give a solution on license applying/charging between clients and app owner, based Ethereum Block chain.

Also is an open contract to prove client already applied/paid for your app, app owner should supply relative service.

Here supply dapp for testing this contract, which implement follow functions:

  1. ethereum accout generate/keystore login/ private key login

  2. transaction in web without metamask(not support metamask yet)

  3. licenseContract method calling(detail move to contract method part)

  4. ethernetwork switch

  5. international language (Chinese/English)

image

image

try visit to experience/test the dapp contract

  [IPFS gateway](https://ipfs.io/ipfs/QmaMYzALCo7Nv6W947cRfdhxCCw9AjexGE7h5Jq4PZEC23)

  [IPFS gateway when blocked](https://ipfs.infura.io/ipfs/QmaMYzALCo7Nv6W947cRfdhxCCw9AjexGE7h5Jq4PZEC23)

contract method

## for app-develop

  `
    function createFreeApp(string _name) external payable whenNotPaused {}

    function createApp(string _name,uint256[] _licenseFees, uint256[] _licenseValidateTimes ) external payable whenNotPaused {}

    function getYourApps() external view returns(uint256[]) {}

    function getAppBrief(uint256 _appId) external view isAppOwner(_appId)  returns(string , uint256 ,  uint256) {}  

    function getAppLicenseList(uint256 _appId) external view isAppOwner(_appId)  returns( uint256[] , uint256[] ) {}

    function getAppCustomerList(uint256 _appId) external view isAppOwner(_appId) returns( address[], uint256[] , uint256[]  ){}

  `
## for client

  `
    function aCustomer(uint256 _appId) public view returns(bool isCustomer, uint256 customerId){}

    function applyLicense (uint256 _appId,uint256 _licenseId) external payable whenNotPaused {}    

    function getLicenseInfo(uint256 _appId) external view returns(bool isCustomer, uint256 licenseId,  uint256 licenseValidateTime, uint256 licenseStartTime, bool licenseValidate ){}

  `

## for contract owner

  `
    function getAllApps() external view  onlyOwner returns(uint256[]) {}

    function pause() onlyOwner whenNotPaused public {}

    function unpause() onlyOwner whenPaused public {}

    function transferOwnership(address newOwner) public onlyOwner {}

    ......

  `
    contract migration/update method  support by zos-lib which make this contract upgradeable(only add feature/status, can not delete)


## events

  `

     event NewApp(uint256 _creationTime, address  _creator, uint256  _appId, string _appName, uint256[] _licenseFees, uint256[]  _licenseValidateTimes)

     event NewCustomer(uint256 _applyTime, address indexed _applior, uint256 indexed _appId,  uint256 indexed _licenseId, uint256 _licenseFee, uint256 _licenseValidateTime, uint256 _LicenseStartTime)

     event UpdateCustomer(uint256 _updateTime,address indexed _applior,  uint256 indexed _appId, uint256 _oldLicenseId, uint256 _oldLicenseStartTime, uint256 indexed _newLicenseId,  uint256 _newLicenseFee, uint256 _newLicenseValideTime, uint256 _newLicenseStartTime)


  `

test contract

`
  npm i
  npm run test
`

reference

zeppelinos

openzeppelin

metamask