space-ios/iOSClient/Security/NCViewCertificateDetails.swift

//
//  NCViewCertificateDetails.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 01/06/21.
//  Copyright © 2021 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import UIKit

public protocol NCViewCertificateDetailsDelegate {
    func viewCertificateDetailsDismiss()
}

// optional func
public extension NCViewCertificateDetailsDelegate {
    func viewCertificateDetailsDismiss() {}
}

class NCViewCertificateDetails: UIViewController  {

    @IBOutlet weak var buttonCancel: UIBarButtonItem!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var textView: UITextView!

    private let appDelegate = UIApplication.shared.delegate as! AppDelegate
    private let directoryCertificate = CCUtility.getDirectoryCerificates()!

    public var delegate: NCViewCertificateDetailsDelegate?
    public var host: String?

    // MARK: - View Life Cycle

    override func viewDidLoad() {
        super.viewDidLoad()
        
        var certificatePath = directoryCertificate + "/" + NCGlobal.shared.certificateTmpV2 + ".txt"
        let hostPushNotificationServerProxy = URL(string: NCBrandOptions.shared.pushNotificationServerProxy)?.host

        self.navigationItem.title = NSLocalizedString("_certificate_details_", comment: "")
        buttonCancel.title = NSLocalizedString("_close_", comment: "")
        
        if host == hostPushNotificationServerProxy {
            certificatePath = directoryCertificate + "/" + NCGlobal.shared.certificatePushNotificationServerProxy
        } else {
            if let host = host {
                certificatePath = directoryCertificate + "/" + host + ".der"
            } else {
                if let host = URL(string: appDelegate.urlBase)?.host {
                    certificatePath = directoryCertificate + "/" + host + ".der"
                }
            }
        }
        
        if FileManager.default.fileExists(atPath: certificatePath) {
            do {
                let text = try String(contentsOfFile: certificatePath, encoding: .utf8)
                let font = UIFont.systemFont(ofSize: 13)
                let attributes = [NSAttributedString.Key.font: font] as [NSAttributedString.Key : Any]
                var contentRect = NSString(string: text).boundingRect(with: CGSize(width: CGFloat.greatestFiniteMagnitude, height: 0), options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: attributes, context: nil)
                contentRect = CGRect(x: contentRect.origin.x, y: contentRect.origin.y, width: ceil(contentRect.size.width), height: ceil(contentRect.size.height))
                var contentWidth = contentRect.size.width
                if contentWidth < view.frame.size.width {
                    contentWidth = view.frame.size.width
                }
                var contentHeight = contentRect.size.height
                if contentHeight < view.frame.size.height {
                    contentHeight = view.frame.size.width
                }
                
                textView.frame = CGRect(x: 0, y: 0, width: contentWidth, height: contentHeight)
                textView.font = font
                textView.text = text
                
                scrollView.contentSize = contentRect.size
                scrollView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 50, right: 0)
                
            } catch {
                print("error")
            }
        } else {
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                self.dismiss(animated: true, completion: nil)
            }
        }
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        self.delegate?.viewCertificateDetailsDismiss()
    }
    
    // MARK: ACTION
    
    @IBAction func actionCancel(_ sender: UIBarButtonItem) {
        self.dismiss(animated: true, completion: nil)
    }
}