BashService.swift

import Foundation
import SecurityFoundation
import ServiceManagement

final class BashService {
    
    // MARK: Private
    
    private var connection: NSXPCConnection?
    private var authorization: SFAuthorization?
    
    private var remoteProxy: ServiceProtocol?
    
    private func connect() throws {
        
        guard connection == nil else { return }
        
        if authorization == nil {
            authorization = try SFAuthorization.withAdminPrivileges(
                prompt: "Application requesting permission to execute bash task"
            )
        }
        
        guard let authorization = authorization else { return }
        
        try ServiceManagment.JobBless(domain: kSMDomainSystemLaunchd,
                                      executable: Keys.machServiceName,
                                      authorization: authorization)
        
        connection = NSXPCConnection(machServiceName: Keys.machServiceName, options: .privileged)
        
        connection?.remoteObjectInterface = NSXPCInterface(with: ServiceProtocol.self)
        connection?.resume()
        
        remoteProxy = connection?.remoteObjectProxy as? ServiceProtocol
    }
    
    public func execute(_ bash: String, completion: @escaping (String) -> Void) {
        do {
            try connect()
            let arguments = bash.split(separator: " ").map { String($0) }
            remoteProxy?.bash(arguments, completion: completion)
        }
        catch { completion("Error: \(error) \n") }
    }
    
}