Email Block List (SwiftUI)

ContentView.swift

//
//  ContentView.swift
//  Email Block List
//
//  Created by Ming on 5/7/2024.
//

import SwiftUI

struct ContentView: View {
    @State private var email = ""
    @State private var status = ""
    var body: some View {
        NavigationStack {
            VStack(alignment: .leading) {
                TextField("Email", text: $email)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .onChange(of: email) { newValue, _ in
                        checkBlockList(email: newValue) { isBlocked in
                            if isBlocked {
                                status = "Blocked: \(email.split(separator: "@")[1])"
                            } else {
                                status = "Safe to continue"
                            }
                        }
                    }
                if status != "" {
                    Label(status, systemImage: status == "Blocked" ? "xmark.circle.fill" : "checkmark.circle.fill")
                        .foregroundColor(status.contains("Blocked") ? .red : .green)
                }
                
                Spacer()
            }.padding(.horizontal)
            .navigationTitle("Register")
            .toolbar {
                ToolbarItemGroup(placement: .navigationBarLeading) {
                    Label("Input your email", systemImage: "envelope")
                        .labelStyle(.titleAndIcon)
                }
            }
        }
    }

    func checkBlockList(email: String, completion: @escaping (Bool) -> Void) {
        let url = URL(string: "https://raw.githubusercontent.com/disposable-email-domains/disposable-email-domains/master/disposable_email_blocklist.conf")!
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            if let data = data {
                if let string = String(data: data, encoding: .utf8) {
                    let lines = string.components(separatedBy: "\n")
                    for line in lines {
                        if email.contains(line) {
                            completion(true)
                            return
                        }
                    }
                }
            }
            completion(false)
        }
        task.resume()
    }
}

#Preview {
    ContentView()
}