PDF_Office/PDF Office/PDF Master/Class/DigtalSignature/ViewControllers/DSignatureDetailsViewController.swift

//
//  DSignatureDetailsViewController.swift
//  PDF Reader Pro Edition
//
//  Created by Niehaoyu on 2023/10/10.
//

import Cocoa

class CDSPDFSigntureModel : NSObject {
    
    var certificate: CPDFSignatureCertificate!
    var level: Int = 0
    var hide: Int = 0
    var count: Int = 0
    var isShow: Bool = false
}

class DSignatureDetailsViewController: NSViewController, NSTableViewDelegate, NSTableViewDataSource, NSTabViewDelegate {
    
    @IBOutlet weak var titleLabel: NSTextField!
    @IBOutlet weak var subTitleLabel: NSTextField!
    @IBOutlet weak var closeButton: NSButton!
    
    @IBOutlet weak var leftScrollView: NSScrollView!
    @IBOutlet weak var tableView: NSTableView!
    
    @IBOutlet weak var tabView: NSTabView!
    
    @IBOutlet weak var summaryImageView: NSImageView!
    @IBOutlet weak var summaryIssuesLabel: NSTextField!
    @IBOutlet weak var summaryVaildFromLabel: NSTextField!
    @IBOutlet weak var summaryVaildtoLabel: NSTextField!
    @IBOutlet weak var summaryUsageLabel: NSTextField!
    @IBOutlet var summaryUsageTextView: NSTextView!
    @IBOutlet weak var summaryNameTextField: NSTextField!
    @IBOutlet weak var summaryIssuesTextField: NSTextField!
    @IBOutlet weak var summaryVaildFromTextField: NSTextField!
    @IBOutlet weak var summaryVaildtoTextField: NSTextField!
    @IBOutlet weak var summaryExportBtn: NSButton!
    
    @IBOutlet weak var detailsTableView: NSTableView!
    @IBOutlet weak var detailsDatasLabel: NSTextField!
    @IBOutlet var detailsTextView: NSTextView!
     
    @IBOutlet weak var trustTitleLabel: NSTextField!
    @IBOutlet weak var trustSubtitleLabel: NSTextField!
    @IBOutlet weak var trustDesBox: NSBox!
    @IBOutlet weak var trustDesTitleLabel: NSTextField!
    @IBOutlet weak var trustDes1ImageView: NSImageView!
    @IBOutlet weak var trustDes1Label: NSTextField!
    @IBOutlet weak var trustDes2ImageView: NSImageView!
    @IBOutlet weak var trustDes2Label: NSTextField!
    @IBOutlet weak var trustButton: NSButton!
    
    @IBOutlet weak var policiesSubLabel: NSTextField!
    
    @IBOutlet weak var legalTitleLabel: NSTextField!
    @IBOutlet weak var legalSubLabel: NSTextField!
    
    var certificates: [CPDFSignatureCertificate] = []
    var signer: CPDFSigner!
    var signature:CPDFSignature!
    var pdfListView: CPDFView!
    var isDigitalFile: Bool = false
    
    var models: NSMutableArray = NSMutableArray.init()
    var certDatas: NSMutableArray = NSMutableArray.init()
    
    deinit {
        print("\(self.className) dealloc")
    }
    
    convenience init() {
        self.init(nibName: "DSignatureDetailsViewController", bundle: nil)
    }
    
    override func viewWillAppear() {
        super.viewWillAppear()
        
        self.view.window?.title = ""
        self.view.window?.titlebarAppearsTransparent = true
        self.view.window?.standardWindowButton(.closeButton)?.isHidden = true
        self.view.window?.standardWindowButton(.miniaturizeButton)?.isHidden = true
        self.view.window?.standardWindowButton(.zoomButton)?.isHidden = true
        
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do view setup here.
        
        self.localizedLanguage()
        
        self.tableView.delegate = self
        self.tableView.dataSource = self
        
        self.detailsTableView.delegate = self
        self.detailsTableView.dataSource = self
        
        self.tabView.delegate = self;
        
        let kMaxDeep = 10
        let kShowFlag = (1 << kMaxDeep)-1
        
        if self.certificates.count > 0 {
            self.models.removeAllObjects()
            for i in 0...self.certificates.count-1 {
                let cert = self.certificates[i]
                let model = CDSPDFSigntureModel.init()
                model.certificate = cert
                model.level = i
                model.hide = kShowFlag
                model.isShow = true
                model.count = self.certificates.count - i - 1
                self.models.add(model)
            }
        }
        self.tableView.reloadData()
        
        self.summaryUsageTextView.backgroundColor = NSColor.clear
        
        if (self.models.count > 0) {
            let set = NSIndexSet.init(index: self.models.count-1)
            self.tableView.selectRowIndexes(set as IndexSet, byExtendingSelection: true)

            self.updateCertificateData()
        }
        
        if (self.isDigitalFile) {
            self.summaryImageView.image = NSImage(named: "ImageNameDSignatureFromFile")
        } else {
            self.summaryImageView.image = NSImage(named: "ImageNameDSignatSaveKechain")
        }
    }
    
    func localizedLanguage () {
        self.titleLabel.stringValue = NSLocalizedString("Certificate Viewer", comment: "")
        self.subTitleLabel.stringValue = NSLocalizedString("This dialog allows you to view the details of a certificate and its entire issuance chain. The details correspond to the selected entry. Multiple issuance chains are being displayed because none of the chains were issued by a trust anchor.", comment: "")
        self.closeButton.title = NSLocalizedString("OK", comment: "")
        self.trustButton.title = NSLocalizedString("Add to Trusted Certificates...", comment: "")
        self.summaryIssuesLabel.stringValue = NSLocalizedString("Issued by:", comment: "")
        self.summaryVaildFromLabel.stringValue = NSLocalizedString("Valid from:", comment: "")
        self.summaryVaildtoLabel.stringValue = NSLocalizedString("Valid to:", comment: "")
        self.summaryUsageLabel.stringValue = NSLocalizedString("Intended usage:", comment: "")
        self.summaryExportBtn.title = NSLocalizedString("Export", comment: "")

        self.detailsDatasLabel.stringValue = NSLocalizedString("Certificate Data:", comment: "")
        self.policiesSubLabel.stringValue = NSLocalizedString("Signatures will be valid if the certificate matches this policy restriction. Policy restrictions are provided by your computer administrator or the certificate authority that issued this certificate. Certificates sometimes contain an identifier to indicate the certificate authority's policy for issuing the certificate. An example policy might be one which indicates that the signer was required to be personally present when issued his or her certificate. Only certificates that have been directly trusted can have policy restrictions.", comment: "")
        
        self.legalTitleLabel.stringValue = NSLocalizedString("Legal Disclaimer:", comment: "")
        self.legalSubLabel.stringValue = NSLocalizedString("Validation of a digitally signed document may require certificate-related services provided by independent third-party service vendors. LynxPDF Editor does not provide any warranties of any kind with respect to digitally signed documents, certificates used to create digitally signed documents, and any related services. ", comment: "")
        
        self.trustSubtitleLabel.stringValue = NSLocalizedString("Trust Settings", comment: "")
        self.trustDesTitleLabel.stringValue = NSLocalizedString("This certificate is trusted to:", comment: "")
        self.trustDes1Label.stringValue = NSLocalizedString("Sign documents or data", comment: "")
        self.trustDes2Label.stringValue = NSLocalizedString("Certify documents", comment: "")
        
        self.tabView.tabViewItem(at: 0).label = NSLocalizedString("Summary", comment: "")
        self.tabView.tabViewItem(at: 1).label = NSLocalizedString("Details", comment: "")
        self.tabView.tabViewItem(at: 2).label = NSLocalizedString("Trust", comment: "")
        self.tabView.tabViewItem(at: 3).label = NSLocalizedString("Policies", comment: "")
        self.tabView.tabViewItem(at: 4).label = NSLocalizedString("Legal Notice", comment: "")
        
        for column in self.detailsTableView.tableColumns {
            column.headerCell.title = NSLocalizedString(column.headerCell.title, comment: "")
        }
        
        self.titleLabel.textColor = NSColor.labelColor
        self.subTitleLabel.textColor = NSColor.labelColor
        self.summaryVaildFromLabel.textColor = NSColor.labelColor
        self.summaryVaildtoLabel.textColor = NSColor.labelColor
        self.summaryUsageLabel.textColor = NSColor.labelColor
        self.summaryIssuesLabel.textColor = NSColor.labelColor
        self.detailsDatasLabel.textColor = NSColor.labelColor
        self.legalTitleLabel.textColor = NSColor.labelColor
        self.legalSubLabel.textColor = NSColor.labelColor
        self.summaryNameTextField.textColor = NSColor.labelColor
        self.summaryIssuesTextField.textColor = NSColor.labelColor
        self.summaryVaildFromTextField.textColor = NSColor.labelColor
        self.summaryVaildtoTextField.textColor = NSColor.labelColor
        self.policiesSubLabel.textColor = NSColor.labelColor
        
    }
    
    func updateCertificateData () {
        for certificate in self.certificates {
            certificate.checkIsTrusted()
        }
        
        let row = self.tableView?.selectedRow
        self.certDatas.removeAllObjects()
        
        if row! > -1 && row! < self.models.count {
            let model = self.models.object(at: row!) as! CDSPDFSigntureModel
            let cert = model.certificate
            
            let keys = ["CN","OU","O", "emailAddress"]
            var subString = String()
            for key in keys {
                let subDic = cert?.subjectDict as? NSDictionary
                if subDic?.object(forKey: key) != nil {
                    let keyValue = String(format: "%@", cert?.subjectDict[key] as! NSString)
                    if keyValue.isEmpty == false {
                        if subString.isEmpty == false {
                            subString = subString + "\n" + keyValue
                        } else {
                            subString = keyValue
                        }
                    }
                }
            }
            var issuesString = String()
            for key in keys {
                let subDic = cert?.issuerDict as? NSDictionary
                if subDic?.object(forKey: key) != nil {
                    let keyValue = cert?.issuerDict[key] as! String
                    if keyValue.isEmpty == false {
                        if issuesString.isEmpty == false {
                            issuesString = issuesString + "\n" + keyValue
                        } else {
                            issuesString = keyValue
                        }
                    }
                }
            }
            
            self.summaryNameTextField.stringValue = subString
            self.summaryIssuesTextField.stringValue = issuesString
            let dateFormatter = DateFormatter.init()
            dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
            
            if cert?.validityStarts != nil {
                self.summaryVaildFromTextField.stringValue = dateFormatter.string(from: cert!.validityStarts)
            } else {
                self.summaryVaildFromTextField.stringValue = ""
            }
            if cert?.validityEnds != nil {
                self.summaryVaildtoTextField.stringValue = dateFormatter.string(from: cert!.validityEnds)
            } else {
                self.summaryVaildtoTextField.stringValue = ""
            }
            
            let att = NSMutableArray.init()
            
            if (cert?.keyUsage.contains(.encipherOnly) == true)  {
                att.add(NSLocalizedString("Encipher Only", comment: ""))
            } 
            if (cert?.keyUsage.contains(.crlSignature) == true)  {
                att.add(NSLocalizedString("CRL Signature", comment: ""))
            }
            if (cert?.keyUsage.contains(.certificateSignature) == true)  {
                att.add(NSLocalizedString("Certificate Signature", comment: ""))
            }
            if (cert?.keyUsage.contains(.keyAgreement) == true)  {
                att.add(NSLocalizedString("Key Agreement", comment: ""))
            }
            if (cert?.keyUsage.contains(.dataEncipherment) == true)  {
                att.add(NSLocalizedString("Data Encipherment", comment: ""))
            }
            if (cert?.keyUsage.contains(.keyEncipherment) == true)  {
                att.add(NSLocalizedString("Key Encipherment", comment: ""))
            }
            if (cert?.keyUsage.contains(.nonRepudiation) == true)  {
                att.add(NSLocalizedString("Non-Repudiation", comment: ""))
            }
            if (cert?.keyUsage.contains(.digitalSignature) == true)  {
                att.add(NSLocalizedString("Digital Signature", comment: ""))
            }
            if (cert?.keyUsage.contains(.dDecipherOnly) == true)  {
                att.add(NSLocalizedString("Decipher Only", comment: ""))
            }
            
            var usageString = String()
            for us in att {
                var usValue = String(format: "%@", us as! String)
                if usValue.isEmpty == false{
                    if usageString.isEmpty == true {
                        usageString = NSLocalizedString(usValue, comment: "")
                    } else {
                        usValue = NSLocalizedString(usValue, comment: "")
                        usageString = String(format: "%@,%@", usageString, usValue)
                    }
                }
            }
            self.summaryUsageTextView.string = usageString
            
            var dic = NSMutableDictionary.init()
            dic.setValue(cert?.version, forKey: NSLocalizedString("Version", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            switch cert?.signatureAlgorithmType {
            case .RSA_RSA:
                dic.setValue("RSA_RSA", forKey: NSLocalizedString("Signature algorithm", comment: ""))
                break
            case .MD2RSA:
                dic.setValue("MD2RSA", forKey: NSLocalizedString("Signature algorithm", comment: ""))
                break
            case .MD4RSA:
                dic.setValue("MD4RSA", forKey: NSLocalizedString("Signature algorithm", comment: ""))
                break
            case .MD5RSA:
                
                break
            case .SHA1RSA:
                dic.setValue("SHA1RSA", forKey: NSLocalizedString("Signature algorithm", comment: ""))
                break
            case .SHA256RSA:
                dic.setValue("SHA256RSA", forKey: NSLocalizedString("Signature algorithm", comment: ""))
                break
            case .SM3SM2:
                dic.setValue("SM3SM2", forKey: NSLocalizedString("Signature algorithm", comment: ""))
                break
            default:
                break
            }
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(cert?.subject, forKey: NSLocalizedString("Subject", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(cert?.issuer, forKey: NSLocalizedString("Issuer", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(cert?.serialNumber, forKey: NSLocalizedString("Serial number", comment: ""))
            self.certDatas.add(dic)
            
            if cert?.validityStarts != nil {
                dic = NSMutableDictionary.init()
                dic.setValue(dateFormatter.string(from: cert!.validityStarts), forKey: NSLocalizedString("Validity Starts", comment: ""))
                self.certDatas.add(dic)
            }
            
            if cert?.validityEnds != nil {
                dic = NSMutableDictionary.init()
                dic.setValue(dateFormatter.string(from: cert!.validityEnds), forKey: NSLocalizedString("Validity ends", comment: ""))
                self.certDatas.add(dic)
            }
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("Authority info access", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("Subject key identifier", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(usageString, forKey: NSLocalizedString("Key usage", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("Certificate policies", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("Authority key identifier", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("CRL distribution points", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("Basic constraints", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("Public key", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(NSLocalizedString("<<see details>>", comment: ""), forKey: NSLocalizedString("SHA1 digest of Public key", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(cert?.x509Data, forKey: NSLocalizedString("X.509 data", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(cert?.sha1Digest, forKey: NSLocalizedString("SHA1 digest", comment: ""))
            self.certDatas.add(dic)
            
            dic = NSMutableDictionary.init()
            dic.setValue(cert?.md5Digest, forKey: NSLocalizedString("MD5 digest", comment: ""))
            self.certDatas.add(dic)
            
            self.detailsTableView.reloadData()
            
            if cert?.isTrusted == false {
                self.trustTitleLabel.stringValue = NSLocalizedString("This certificate is not trusted.", comment: "")
                self.trustButton.isEnabled = true
                self.trustDes1ImageView.image = NSImage(named: "ImageNameSigntureTrustedFailureIcon")
                self.trustDes2ImageView.image = NSImage(named: "ImageNameSigntureTrustedFailureIcon")
            } else {
                self.trustTitleLabel.stringValue = NSLocalizedString("This certificate is trusted because you have the corresponding private key.", comment: "")
                self.trustButton.isEnabled = false
                self.trustDes1ImageView.image = NSImage(named: "ImageNameSigntureTrustedIcon")
                self.trustDes2ImageView.image = NSImage(named: "ImageNameSigntureTrustedIcon")
            }
        }
    }
    
    func sizeOfString(_ string: String, _ font: NSFont) -> (CGFloat) {
        let attributes: [NSAttributedString.Key: Any] = [
            .font: font
        ]
        let size = (string as NSString).boundingRect(with: NSSize(width: CGFloat(MAXFLOAT), height: font.pointSize+5),
                                                     options: .usesLineFragmentOrigin,
                                                     attributes: attributes,
                                                     context: nil).size
        return size.width + 10
    }
    
    //MARK: IBAction
    @IBAction func actionClose(_ sender: Any) {
        self.dismiss(self)
    }
    
    @IBAction func exportAction(_ sender: NSButton) {
        let model = self.models[self.tableView.selectedRow] as! CDSPDFSigntureModel
        let cert = model.certificate
        
        var fileName = cert?.subjectDict["CN"] as! String
        if fileName.count == 0 {
            fileName = NSFullUserName()
        }
        fileName.append("_CertExchange")
        
        let outputSavePanel = NSSavePanel()
        outputSavePanel.allowedFileTypes = ["cer"]
        outputSavePanel.nameFieldStringValue = fileName
        let result = outputSavePanel.runModal()
        if result == .OK {
            let filePath = outputSavePanel.url?.path
            let success = cert?.export(toFilePath: filePath)
            if success == true {
                NSWorkspace.shared.selectFile(filePath, inFileViewerRootedAtPath: "")
            } else {
                let alert = NSAlert.init()
                alert.messageText = NSLocalizedString("Export Failure!", comment: "")
                alert.addButton(withTitle: NSLocalizedString("OK", comment: ""))
                alert.runModal()
            }
        }
    }
    
    
    @IBAction func buttonItemClick_TrustCer(_ sender: NSButton) {
        let model = self.models.object(at: self.tableView.selectedRow) as! CDSPDFSigntureModel
        let cert = model.certificate!
        
        let success = cert.addToTrustedCertificates()
        if success {
            self.updateCertificateData()
            if self.signature != nil {
                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "CSignatureTrustCerDidChangeNotification"), object: nil)
                self.signature.verifySignature(with: self.pdfListView.document)
            }
            
            let alert = NSAlert.init()
            alert.messageText = NSLocalizedString("Add to Trusted Certificate Successfully!", comment: "")
            alert.addButton(withTitle: NSLocalizedString("OK", comment: ""))
            alert.runModal()
        } else {
            let alert = NSAlert.init()
            alert.messageText = NSLocalizedString("Add to Trusted Certificate Failed!", comment: "")
            alert.addButton(withTitle: NSLocalizedString("OK", comment: ""))
            alert.runModal()
        }
    }
    
    
    //MARK: NSTableViewDelegate
    func numberOfRows(in tableView: NSTableView) -> Int {
        if tableView.isEqual(self.detailsTableView) {
            return self.certDatas.count
        } else {
            return self.models.count
        }
    }
    
    func tableView(_ tableView: NSTableView, heightOfRow row: Int) -> CGFloat {
        return 22.0
    }
    
    func tableView(_ tableView: NSTableView, rowViewForRow row: Int) -> NSTableRowView? {
        return NSTableRowView()
    }
    
    func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
        
        if self.detailsTableView.isEqual(tableView) {
            let dic = self.certDatas.object(at: row) as? NSDictionary ?? [:]
            let cell = tableView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(tableColumn?.identifier.rawValue ?? ""), owner: self) as! NSTableCellView
            if ((tableColumn?.identifier.rawValue) == "name") {
                cell.textField?.stringValue = dic.allKeys.first as! String
            } else if ((tableColumn?.identifier.rawValue) == "value") {
//                tableColumn?.title = NSLocalizedString("Value:", comment: "")
                let key = dic.allKeys.first as! String
                cell.textField?.stringValue = dic.object(forKey: key) as! String
            }
            
            return cell
        } else {
            let cellView = DSignDetailTypeACellView()
            cellView.model = self.models.object(at: row) as! CDSPDFSigntureModel
            
            let width = self.sizeOfString(cellView.contendLabel.stringValue, cellView.contendLabel.font!)
            
            let max = max(width, tableColumn!.width)
            tableColumn?.width = max
            
            return cellView
        }
    }
    
    func tableViewSelectionDidChange(_ notification: Notification) {
        let tableView = notification.object
        if self.detailsTableView.isEqual(tableView) {
            let row = self.tableView.selectedRow
            if row < 0 || row >= self.models.count {
                return
            }
            let model = self.models.object(at: row) as! CDSPDFSigntureModel
            let cert = model.certificate!
            
            let dateFormatter = DateFormatter.init()
            dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
            
            let selectedRow = self.detailsTableView.selectedRow

            if selectedRow == 0 {
                self.detailsTextView.string = cert.version ?? ""
            } else if selectedRow == 1 {
                switch cert.signatureAlgorithmType {
                case .RSA_RSA:
                    self.detailsTextView.string = String(format: "%@(%@)","RSA_RSA",cert.signatureAlgorithmOID ?? "")
                    break;
                case .MD2RSA:
                    self.detailsTextView.string = String(format: "%@(%@)","MD2RSA",cert.signatureAlgorithmOID ?? "")
                    break;
                case .MD4RSA:
                    self.detailsTextView.string = String(format: "%@(%@)", "MD4RSA",cert.signatureAlgorithmOID ?? "")
                    break;
                case .SHA1RSA:
                    self.detailsTextView.string = String(format: "%@(%@)", "SHA1RSA",cert.signatureAlgorithmOID ?? "")
                    break;
                case .SHA256RSA:
                    self.detailsTextView.string = String(format: "%@(%@)", "SHA256RSA",cert.signatureAlgorithmOID ?? "")
                    break;
                case .SM3SM2:
                    self.detailsTextView.string = String(format: "%@(%@)", "SM3SM2",cert.signatureAlgorithmOID ?? "")
                    break;
                default: break
                }
            } else if selectedRow == 2 {
                var string = ""
                for key in cert.subjectDict.keys {
                    if (string.count == 0) {
                        string = String(format: "%@=%@",(key as? String) ?? "", (cert.subjectDict[key] as? String) ?? "")
                    } else {
                        string = String(format: "%@\n%@=%@",string, (key as? String) ?? "", (cert.subjectDict[key] as? String) ?? "")
                    }
                }
                self.detailsTextView.string = string 
            } else if selectedRow == 3 {
                var string = ""
                for key in cert.issuerDict.keys {
                    if (string.count == 0) {
                        string = String(format: "%@=%@",(key as? String) ?? "", (cert.issuerDict[key] as? String) ?? "")
                    } else {
                        string = String(format: "%@\n%@=%@",string, (key as? String) ?? "", (cert.issuerDict[key] as? String) ?? "")
                    }
                }
                self.detailsTextView.string = string
            } else if selectedRow == 4 {
                self.detailsTextView.string = cert.serialNumber ?? ""
            } else if selectedRow == 5 {
                self.detailsTextView.string = dateFormatter.string(from: cert.validityStarts)
            } else if selectedRow == 6 {
                self.detailsTextView.string = dateFormatter.string(from: cert.validityEnds)
            } else if selectedRow == 7 {
                var content = ""
                for infoDic in cert.authorityInfoAccess {
                    let dic: Dictionary = infoDic
                    if content.count == 0 {
                        content = String(format: "%@ = %@", (dic["Method"] as? String) ?? "", (dic["Method"] as? String) ?? "")
                        content = content + "\n"
                        let tString = String(format: "URL = %@", (dic["URI"] as? String) ?? "")
                        content = content + tString
                    } else {
                        content = content + "\n"
                        content = content + "\n"
                        var tString = String(format: "Method = %@", (dic["Method"] as? String) ?? "")
                    
                        content = content + tString
                        content = content + "\n"
                        tString = String(format: "URL = %@",(dic["URI"] as? String) ?? "")
                        content = content + tString
                    }
                }
                self.detailsTextView.string = content
            } else if selectedRow == 8 {
                self.detailsTextView.string = cert.subjectKeyIdentifier.uppercased() 
            } else if selectedRow == 9 {
                let att = NSMutableArray()
                if cert.keyUsage.contains(.encipherOnly) == true {
                    att.add(NSLocalizedString("Encipher Only", comment: ""))
                } else if cert.keyUsage.contains(.crlSignature) == true {
                    att.add(NSLocalizedString("CRL Signature", comment: ""))
                } else if cert.keyUsage.contains(.certificateSignature) == true {
                    att.add(NSLocalizedString("Certificate Signature", comment: ""))
                } else if cert.keyUsage.contains(.keyAgreement) == true {
                    att.add(NSLocalizedString("Key Agreement", comment: ""))
                } else if cert.keyUsage.contains(.dataEncipherment) == true {
                    att.add(NSLocalizedString("Data Encipherment", comment: ""))
                } else if cert.keyUsage.contains(.keyEncipherment) == true {
                    att.add(NSLocalizedString("Key Encipherment", comment: ""))
                } else if cert.keyUsage.contains(.nonRepudiation) == true {
                    att.add(NSLocalizedString("Non-Repudiation", comment: ""))
                } else if cert.keyUsage.contains(.digitalSignature) == true {
                    att.add(NSLocalizedString("Digital Signature", comment: ""))
                } else if cert.keyUsage.contains(.dDecipherOnly) == true {
                    att.add(NSLocalizedString("Decipher Only", comment: ""))
                }
                var usageString = ""
                for us in att {
                    if usageString.count == 0 {
                        usageString = NSLocalizedString((us as? String) ?? "", comment: "")
                    } else {
                        usageString = String(format: "%@\n%@",usageString, NSLocalizedString((us as? String) ?? "", comment: ""))
                    }
                    
                    if usageString.count == 0 {
                       
                    } else {
                        usageString = String(format: "%@\n%@",usageString, NSLocalizedString((us as? String) ?? "", comment: ""))
                    }
                }
                self.detailsTextView.string = usageString
            } else if selectedRow == 10 {
                self.detailsTextView.string = cert.certificatePolicies ?? ""
            } else if selectedRow == 11 {
                self.detailsTextView.string = cert.authorityKeyIdentifier.uppercased()
            } else if selectedRow == 12 {
                var content = ""
                for tString in cert.crlDistributionPoints {
                    if content.count == 0 {
                        content = tString
                    } else {
                        content = content + "\n"
                        content = content + tString
                    }
                }
                self.detailsTextView.string = content
            } else if selectedRow == 13 {
                self.detailsTextView.string = cert.basicConstraints?.replacingOccurrences(of: ",", with: "\n") ?? ""
            } else if selectedRow == 14 {
                self.detailsTextView.string = cert.publicKey?.replacingOccurrences(of: ":", with: " ") ?? ""
            } else if selectedRow == 15 {
                self.detailsTextView.string = cert.subjectKeyIdentifier?.uppercased() ?? ""
            } else if selectedRow == 16 {
                self.detailsTextView.string = cert.x509Data?.replacingOccurrences(of: ":", with: " ") ?? ""
            } else if selectedRow == 17 {
                self.detailsTextView.string = cert.sha1Digest?.replacingOccurrences(of: ":", with: " ") ?? ""
            } else if selectedRow == 18 {
                self.detailsTextView.string = cert.md5Digest?.replacingOccurrences(of: ":", with: " ") ?? ""
            }
        } else {
            self.detailsTextView.string = ""
            self.updateCertificateData()
        }
    }
    
    
    
    
}