tatsuyamoriguchi / Sleep-Tracer

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Check if a user already exists in Keychain. #62

Closed tatsuyamoriguchi closed 6 months ago

tatsuyamoriguchi commented 6 months ago

Certainly! You can use the Keychain Services API provided by Apple to manage secure storage of sensitive information like user credentials. Here's an example Swift code to achieve what you want:

import Foundation
import Security

// Function to check if a user account already exists in Keychain
func checkIfUserExistsInKeychain() -> Bool {
    // Define query parameters
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrService as String: "YourAppServiceName", // Unique identifier for your app
        kSecAttrAccount as String: "UserAccount" // Unique identifier for the user
    ]

    // Try to fetch existing item from Keychain
    var result: CFTypeRef?
    let status = SecItemCopyMatching(query as CFDictionary, &result)

    // Check if user account exists or not
    if status == errSecSuccess {
        return true // User account exists
    } else {
        return false // User account does not exist
    }
}

// Function to register user account to Keychain
func registerUserToKeychain() -> Bool {
    // Define data to be stored in Keychain
    let userCredentials = "UserPassword".data(using: .utf8)!

    // Define query parameters
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrService as String: "YourAppServiceName", // Unique identifier for your app
        kSecAttrAccount as String: "UserAccount", // Unique identifier for the user
        kSecValueData as String: userCredentials
    ]

    // Try to add data to Keychain
    let status = SecItemAdd(query as CFDictionary, nil)

    // Check if data was successfully added or not
    if status == errSecSuccess {
        return true // User account registered successfully
    } else {
        return false // Failed to register user account
    }
}

// Function to handle user registration process
func registerUserAccount() {
    // Check if user account already exists
    if checkIfUserExistsInKeychain() {
        print("Error: User account already exists in Keychain.")
    } else {
        // Register user account to Keychain
        if registerUserToKeychain() {
            print("User account registered successfully.")
        } else {
            print("Error: Failed to register user account.")
        }
    }
}

// Call the function to start the registration process
registerUserAccount()

In this code:

Make sure to replace "YourAppServiceName" with a unique identifier for your app and "UserAccount" with a unique identifier for the user. Also, ensure that you handle errors appropriately in your actual app code.