DICT Activity: Reading a Smart Contract — Permit Registry

PermitRegistry.sol

// This contract stores and manages building permits
contract PermitRegistry {

  // STATE VARIABLES: Data this contract remembers
  address public officer;        // Who is the authorized officer?
  uint    public permitCount;    // How many permits issued?

  // A 'struct' is a record template (like a government form)
  struct Permit {
    string applicantName;        // Text: applicant name
    bool   isApproved;           // True/False: approved?
    uint   issueDate;            // Number: when issued
  }

  // FUNCTION: submit a new application
  function submitApplication(string memory name) public {
    require(bytes(name).length > 0, 'Name is required');  // VALIDATION
    permitCount = permitCount + 1;                         // STATE CHANGE
  }

  // FUNCTION: only the officer can approve
  function approvePermit(uint permitId) public {
    require(msg.sender == officer, 'Authorized officer only');
    permits[permitId].isApproved = true;  // STATE CHANGE
  }
}