Upload AddressBook.sol

AddressBook.sol

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+// SPDX-License-Identifier: GPL-3.0
+pragma solidity ^0.8.8;
+
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+contract AddressBook is Ownable(msg.sender) {
+    // Define a private salt value for internal use
+    string private salt = "value"; 
+
+    // Define a struct to represent a contact
+    struct Contact {
+        uint id; // Unique identifier for the contact
+        string firstName; // First name of the contact
+        string lastName; // Last name of the contact
+        uint[] phoneNumbers; // Array to store multiple phone numbers for the contact
+    }
+
+    // Array to store all contacts
+    Contact[] private contacts;
+
+    // Mapping to store the index of each contact in the contacts array using its ID
+    mapping(uint => uint) private idToIndex;
+
+    // Variable to keep track of the ID for the next contact
+    uint private nextId = 1;
+
+    // Custom error for when a contact is not found
+    error ContactNotFound(uint id);
+
+    // Function to add a new contact
+    function addContact(string calldata firstName, string calldata lastName, uint[] calldata phoneNumbers) external onlyOwner {
+        // Create a new contact with the provided details and add it to the contacts array
+        contacts.push(Contact(nextId, firstName, lastName, phoneNumbers));
+        // Map the ID of the new contact to its index in the array
+        idToIndex[nextId] = contacts.length - 1;
+        // Increment the nextId for the next contact
+        nextId++;
+    }
+
+    // Function to delete a contact by its ID
+    function deleteContact(uint id) external onlyOwner {
+        // Get the index of the contact to be deleted
+        uint index = idToIndex[id];
+        // Check if the index is valid and if the contact with the provided ID exists
+        if (index >= contacts.length || contacts[index].id != id) revert ContactNotFound(id);
+
+        // Replace the contact to be deleted with the last contact in the array
+        contacts[index] = contacts[contacts.length - 1];
+        // Update the index mapping for the moved contact
+        idToIndex[contacts[index].id] = index;
+        // Remove the last contact from the array
+        contacts.pop();
+        // Delete the mapping entry for the deleted contact ID
+        delete idToIndex[id];
+    }
+
+    // Function to retrieve a contact by its ID
+    function getContact(uint id) external view returns (Contact memory) {
+        // Get the index of the contact
+        uint index = idToIndex[id];
+        // Check if the index is valid and if the contact with the provided ID exists
+        if (index >= contacts.length || contacts[index].id != id) revert ContactNotFound(id);
+        // Return the contact details
+        return contacts[index];
+    }
+
+    // Function to retrieve all contacts
+    function getAllContacts() external view returns (Contact[] memory) {
+        // Return the array of all contacts
+        return contacts;
+    }
+}