/*
 * SecureBlackbox 2024 .NET Edition - Sample Project
 *
 * This sample project demonstrates the usage of SecureBlackbox in a 
 * simple, straightforward way. It is not intended to be a complete 
 * application. Error handling and other checks are simplified for clarity.
 *
 * www.nsoftware.com/secureblackbox
 *
 * This code is subject to the terms and conditions specified in the 
 * corresponding product license agreement which outlines the authorized 
 * usage and restrictions.
 * 
 */

using System;
using System.Windows.Forms;
using nsoftware.SecureBlackbox;

namespace PDFVerifierDemo
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class frmMain : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label lSelectSource;
		private System.Windows.Forms.TextBox edPDFFile;
		private System.Windows.Forms.Button btnBrowse;
		private System.Windows.Forms.Button btnVerify;
		private System.Windows.Forms.OpenFileDialog openDialogPDF;
		private System.Windows.Forms.OpenFileDialog openDialogCert;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
        
        private PDFVerifier verifier;
        private GroupBox groupBox1;
        private GroupBox groupBox3;
        public ListView lvTrustedCertificates;
        private ColumnHeader columnHeader3;
        private ColumnHeader columnHeader4;
        private Button btnRemoveTrusted;
        private Button btnAddTrusted;
        private GroupBox groupBox2;
        public ListView lvKnownCertificates;
        private ColumnHeader columnHeader1;
        private ColumnHeader columnHeader2;
        private Button btnRemoveKnown;
        private Label label1;
        public CheckBox cbOfflineMode;
        public CheckBox cbPerformRevocationCheck;
        public CheckBox cbIgnoreChainValidationErrors;
        public CheckBox cbForceCompleteChainValidation;
        private Button bthAddKnown;

        public frmMain()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

            verifier = new PDFVerifier();
            verifier.OnSignatureFound += new PDFVerifier.OnSignatureFoundHandler(SignatureFound);
        }

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
                    verifier.Dispose();
                }
			}
			base.Dispose( disposing );
		}

        private void SignatureFound(object s, PDFVerifierSignatureFoundEventArgs e)
        {
            if (e.CertFound)
            {
                e.ValidateSignature = true;
                e.ValidateChain = true;
            }
            else
            {
                SignForm dlg = new SignForm(verifier);
                dlg.edSignatureName.Text = verifier.Signatures[e.Index].SignatureName;
                dlg.edIssuerRDN.Text = e.IssuerRDN;
                dlg.edSerialNumber.Text = BitConverter.ToString(e.SerialNumber);
                dlg.edSubjectKeyID.Text = BitConverter.ToString(e.SubjectKeyID);

                dlg.UpdateCertificates();

                if (dlg.ShowDialog() == DialogResult.OK)
                {
                    e.ValidateSignature = true;
                    e.ValidateChain = true;
                }
                else
                {
                    e.ValidateSignature = false;
                    e.ValidateChain = false;
                }
            }
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
		{
            this.lSelectSource = new System.Windows.Forms.Label();
            this.edPDFFile = new System.Windows.Forms.TextBox();
            this.btnBrowse = new System.Windows.Forms.Button();
            this.btnVerify = new System.Windows.Forms.Button();
            this.openDialogPDF = new System.Windows.Forms.OpenFileDialog();
            this.openDialogCert = new System.Windows.Forms.OpenFileDialog();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.groupBox3 = new System.Windows.Forms.GroupBox();
            this.lvTrustedCertificates = new System.Windows.Forms.ListView();
            this.columnHeader3 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.columnHeader4 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.btnRemoveTrusted = new System.Windows.Forms.Button();
            this.btnAddTrusted = new System.Windows.Forms.Button();
            this.groupBox2 = new System.Windows.Forms.GroupBox();
            this.lvKnownCertificates = new System.Windows.Forms.ListView();
            this.columnHeader1 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.columnHeader2 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
            this.btnRemoveKnown = new System.Windows.Forms.Button();
            this.bthAddKnown = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.cbOfflineMode = new System.Windows.Forms.CheckBox();
            this.cbPerformRevocationCheck = new System.Windows.Forms.CheckBox();
            this.cbIgnoreChainValidationErrors = new System.Windows.Forms.CheckBox();
            this.cbForceCompleteChainValidation = new System.Windows.Forms.CheckBox();
            this.groupBox1.SuspendLayout();
            this.groupBox3.SuspendLayout();
            this.groupBox2.SuspendLayout();
            this.SuspendLayout();
            // 
            // lSelectSource
            // 
            this.lSelectSource.AutoSize = true;
            this.lSelectSource.Location = new System.Drawing.Point(5, 32);
            this.lSelectSource.Name = "lSelectSource";
            this.lSelectSource.Size = new System.Drawing.Size(164, 13);
            this.lSelectSource.TabIndex = 0;
            this.lSelectSource.Text = "Please select the PDF document:";
            // 
            // edPDFFile
            // 
            this.edPDFFile.Location = new System.Drawing.Point(8, 48);
            this.edPDFFile.Name = "edPDFFile";
            this.edPDFFile.Size = new System.Drawing.Size(373, 21);
            this.edPDFFile.TabIndex = 1;
            // 
            // btnBrowse
            // 
            this.btnBrowse.Location = new System.Drawing.Point(387, 45);
            this.btnBrowse.Name = "btnBrowse";
            this.btnBrowse.Size = new System.Drawing.Size(75, 25);
            this.btnBrowse.TabIndex = 2;
            this.btnBrowse.Text = "Browse...";
            this.btnBrowse.Click += new System.EventHandler(this.btnBrowse_Click);
            // 
            // btnVerify
            // 
            this.btnVerify.Location = new System.Drawing.Point(560, 250);
            this.btnVerify.Name = "btnVerify";
            this.btnVerify.Size = new System.Drawing.Size(75, 25);
            this.btnVerify.TabIndex = 3;
            this.btnVerify.Text = "Verify";
            this.btnVerify.Click += new System.EventHandler(this.btnVerify_Click);
            // 
            // openDialogPDF
            // 
            this.openDialogPDF.Filter = "PDF documents (*.pdf)|*.pdf|All files (*.*)|*.*";
            this.openDialogPDF.InitialDirectory = ".";
            // 
            // openDialogCert
            // 
            this.openDialogCert.Filter = "PKCS#12 files (*.pfx)|*.pfx|All files (*.*)|*.*";
            this.openDialogCert.InitialDirectory = ".";
            this.openDialogCert.Title = "Please select a certificate to decrypt the document";
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.cbOfflineMode);
            this.groupBox1.Controls.Add(this.cbPerformRevocationCheck);
            this.groupBox1.Controls.Add(this.cbIgnoreChainValidationErrors);
            this.groupBox1.Controls.Add(this.cbForceCompleteChainValidation);
            this.groupBox1.Controls.Add(this.groupBox3);
            this.groupBox1.Controls.Add(this.groupBox2);
            this.groupBox1.Location = new System.Drawing.Point(5, 80);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(630, 160);
            this.groupBox1.TabIndex = 39;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "Validation settings  ";
            // 
            // groupBox3
            // 
            this.groupBox3.Controls.Add(this.lvTrustedCertificates);
            this.groupBox3.Controls.Add(this.btnRemoveTrusted);
            this.groupBox3.Controls.Add(this.btnAddTrusted);
            this.groupBox3.Location = new System.Drawing.Point(325, 55);
            this.groupBox3.Name = "groupBox3";
            this.groupBox3.Size = new System.Drawing.Size(300, 100);
            this.groupBox3.TabIndex = 17;
            this.groupBox3.TabStop = false;
            this.groupBox3.Text = "Trusted Certificates";
            // 
            // lvTrustedCertificates
            // 
            this.lvTrustedCertificates.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
            this.columnHeader3,
            this.columnHeader4});
            this.lvTrustedCertificates.HideSelection = false;
            this.lvTrustedCertificates.Location = new System.Drawing.Point(5, 20);
            this.lvTrustedCertificates.Name = "lvTrustedCertificates";
            this.lvTrustedCertificates.Size = new System.Drawing.Size(210, 75);
            this.lvTrustedCertificates.TabIndex = 4;
            this.lvTrustedCertificates.UseCompatibleStateImageBehavior = false;
            this.lvTrustedCertificates.View = System.Windows.Forms.View.Details;
            // 
            // columnHeader3
            // 
            this.columnHeader3.Text = "Serial";
            this.columnHeader3.Width = 85;
            // 
            // columnHeader4
            // 
            this.columnHeader4.Text = "Issuer";
            this.columnHeader4.Width = 120;
            // 
            // btnRemoveTrusted
            // 
            this.btnRemoveTrusted.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.btnRemoveTrusted.Location = new System.Drawing.Point(220, 50);
            this.btnRemoveTrusted.Name = "btnRemoveTrusted";
            this.btnRemoveTrusted.Size = new System.Drawing.Size(75, 25);
            this.btnRemoveTrusted.TabIndex = 3;
            this.btnRemoveTrusted.Text = "Remove";
            this.btnRemoveTrusted.Click += new System.EventHandler(this.btnRemoveTrusted_Click);
            // 
            // btnAddTrusted
            // 
            this.btnAddTrusted.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.btnAddTrusted.Location = new System.Drawing.Point(220, 20);
            this.btnAddTrusted.Name = "btnAddTrusted";
            this.btnAddTrusted.Size = new System.Drawing.Size(75, 25);
            this.btnAddTrusted.TabIndex = 2;
            this.btnAddTrusted.Text = "Add";
            this.btnAddTrusted.Click += new System.EventHandler(this.btnAddTrusted_Click);
            // 
            // groupBox2
            // 
            this.groupBox2.Controls.Add(this.lvKnownCertificates);
            this.groupBox2.Controls.Add(this.btnRemoveKnown);
            this.groupBox2.Controls.Add(this.bthAddKnown);
            this.groupBox2.Location = new System.Drawing.Point(5, 55);
            this.groupBox2.Name = "groupBox2";
            this.groupBox2.Size = new System.Drawing.Size(300, 100);
            this.groupBox2.TabIndex = 16;
            this.groupBox2.TabStop = false;
            this.groupBox2.Text = "Known Certificates";
            // 
            // lvKnownCertificates
            // 
            this.lvKnownCertificates.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
            this.columnHeader1,
            this.columnHeader2});
            this.lvKnownCertificates.HideSelection = false;
            this.lvKnownCertificates.Location = new System.Drawing.Point(5, 20);
            this.lvKnownCertificates.Name = "lvKnownCertificates";
            this.lvKnownCertificates.Size = new System.Drawing.Size(210, 75);
            this.lvKnownCertificates.TabIndex = 4;
            this.lvKnownCertificates.UseCompatibleStateImageBehavior = false;
            this.lvKnownCertificates.View = System.Windows.Forms.View.Details;
            // 
            // columnHeader1
            // 
            this.columnHeader1.Text = "Serial";
            this.columnHeader1.Width = 85;
            // 
            // columnHeader2
            // 
            this.columnHeader2.Text = "Issuer";
            this.columnHeader2.Width = 120;
            // 
            // btnRemoveKnown
            // 
            this.btnRemoveKnown.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.btnRemoveKnown.Location = new System.Drawing.Point(220, 50);
            this.btnRemoveKnown.Name = "btnRemoveKnown";
            this.btnRemoveKnown.Size = new System.Drawing.Size(75, 25);
            this.btnRemoveKnown.TabIndex = 3;
            this.btnRemoveKnown.Text = "Remove";
            this.btnRemoveKnown.Click += new System.EventHandler(this.btnRemoveKnown_Click);
            // 
            // bthAddKnown
            // 
            this.bthAddKnown.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.bthAddKnown.Location = new System.Drawing.Point(220, 20);
            this.bthAddKnown.Name = "bthAddKnown";
            this.bthAddKnown.Size = new System.Drawing.Size(75, 25);
            this.bthAddKnown.TabIndex = 2;
            this.bthAddKnown.Text = "Add";
            this.bthAddKnown.Click += new System.EventHandler(this.bthAddKnown_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.ForeColor = System.Drawing.SystemColors.Highlight;
            this.label1.Location = new System.Drawing.Point(5, 5);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(423, 13);
            this.label1.TabIndex = 44;
            this.label1.Text = "This sample illustrates the use of PDFVerifier component for validating PDF signa" +
    "tures. ";
            // 
            // cbOfflineMode
            // 
            this.cbOfflineMode.AutoSize = true;
            this.cbOfflineMode.Location = new System.Drawing.Point(538, 27);
            this.cbOfflineMode.Name = "cbOfflineMode";
            this.cbOfflineMode.Size = new System.Drawing.Size(87, 17);
            this.cbOfflineMode.TabIndex = 54;
            this.cbOfflineMode.Text = "Offline Mode";
            // 
            // cbPerformRevocationCheck
            // 
            this.cbPerformRevocationCheck.AutoSize = true;
            this.cbPerformRevocationCheck.Location = new System.Drawing.Point(382, 27);
            this.cbPerformRevocationCheck.Name = "cbPerformRevocationCheck";
            this.cbPerformRevocationCheck.Size = new System.Drawing.Size(148, 17);
            this.cbPerformRevocationCheck.TabIndex = 51;
            this.cbPerformRevocationCheck.Text = "Perform revocation check";
            // 
            // cbIgnoreChainValidationErrors
            // 
            this.cbIgnoreChainValidationErrors.AutoSize = true;
            this.cbIgnoreChainValidationErrors.Location = new System.Drawing.Point(8, 27);
            this.cbIgnoreChainValidationErrors.Name = "cbIgnoreChainValidationErrors";
            this.cbIgnoreChainValidationErrors.Size = new System.Drawing.Size(167, 17);
            this.cbIgnoreChainValidationErrors.TabIndex = 52;
            this.cbIgnoreChainValidationErrors.Text = "Ignore chain validation errors";
            // 
            // cbForceCompleteChainValidation
            // 
            this.cbForceCompleteChainValidation.AutoSize = true;
            this.cbForceCompleteChainValidation.Location = new System.Drawing.Point(191, 27);
            this.cbForceCompleteChainValidation.Name = "cbForceCompleteChainValidation";
            this.cbForceCompleteChainValidation.Size = new System.Drawing.Size(176, 17);
            this.cbForceCompleteChainValidation.TabIndex = 53;
            this.cbForceCompleteChainValidation.Text = "Force complete chain validation";
            // 
            // frmMain
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(639, 281);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.groupBox1);
            this.Controls.Add(this.btnVerify);
            this.Controls.Add(this.btnBrowse);
            this.Controls.Add(this.edPDFFile);
            this.Controls.Add(this.lSelectSource);
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(204)));
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
            this.MaximizeBox = false;
            this.Name = "frmMain";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "PDF Verifier demo";
            this.groupBox1.ResumeLayout(false);
            this.groupBox1.PerformLayout();
            this.groupBox3.ResumeLayout(false);
            this.groupBox2.ResumeLayout(false);
            this.ResumeLayout(false);
            this.PerformLayout();

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new frmMain());
		}

		private void btnBrowse_Click(object sender, System.EventArgs e)
		{
			if (openDialogPDF.ShowDialog() == DialogResult.OK) 
                edPDFFile.Text = openDialogPDF.FileName;
		}

		private void btnVerify_Click(object sender, System.EventArgs e)
		{
			try
            {
                verifier.InputFile = edPDFFile.Text;
                if (cbPerformRevocationCheck.Checked) 
                {
                    verifier.RevocationCheck = PDFVerifierRevocationChecks.crcAuto;
                }
                else
                {
                    verifier.RevocationCheck = PDFVerifierRevocationChecks.crcNone;
                }
                verifier.IgnoreChainValidationErrors = cbIgnoreChainValidationErrors.Checked;
                verifier.OfflineMode = cbOfflineMode.Checked;

                if (cbForceCompleteChainValidation.Checked)
                    verifier.Config("ForceCompleteChainValidation=true");
                else
                    verifier.Config("ForceCompleteChainValidation=False");

                verifier.Verify();

                DisplaySignaturesInfo();
            } 
			catch(Exception ex) 
			{
				MessageBox.Show("Error: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
			}
        }

        private void DisplaySignaturesInfo()
        {
            ValidationResultForm dlg = new ValidationResultForm();
            dlg.Init(verifier);
            dlg.ShowDialog();
        }

        public Certificate LoadCertificate(string file, string password)
        {
            Certificate cert = null;

            if (file.Length > 0)
            {
                try
                {
                    CertificateManager certmanager = new CertificateManager();

                    certmanager.ImportFromFile(file, password);

                    cert = certmanager.Certificate;
                }
                catch (Exception e)
                {
                    MessageBox.Show("Cannot load certificate!");
                }
            }

            return cert;
        }

        private string RequestPassword()
        {
            frmRequestPassword dlg = new frmRequestPassword();
            string s = "";
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                s = dlg.tbInput.Text;
            }
            dlg.Dispose();
            return s;
        }

        public void UpdateKnownCertificates()
        {
            lvKnownCertificates.BeginUpdate();
            lvKnownCertificates.Items.Clear();

            for (int i = 0; i < verifier.KnownCertificates.Count; i++)
            {
                string s = verifier.KnownCertificates[i].Issuer;
                if (s == "")
                    s = "<unknown>";
                
                ListViewItem Item = lvKnownCertificates.Items.Add(BitConverter.ToString(verifier.KnownCertificates[i].SerialNumber));
                Item.SubItems.Add(s);
            }

            lvKnownCertificates.EndUpdate();
        }

        public void UpdateTrustedCertificates()
        {
            lvTrustedCertificates.BeginUpdate();
            lvTrustedCertificates.Items.Clear();

            for (int i = 0; i < verifier.TrustedCertificates.Count; i++)
            {
                string s = verifier.TrustedCertificates[i].Issuer;
                if (s == "")
                    s = "<unknown>";
                
                ListViewItem Item = lvTrustedCertificates.Items.Add(BitConverter.ToString(verifier.TrustedCertificates[i].SerialNumber));
                Item.SubItems.Add(s);
            }

            lvTrustedCertificates.EndUpdate();
        }

        private void bthAddKnown_Click(object sender, EventArgs e)
        {
            openDialogCert.Title = "Select certificate file";
            openDialogCert.Filter = "PEM-encoded certificate (*.pem)|*.PEM|DER-encoded certificate (*.cer)|*.CER|PFX-encoded certificate (*.pfx)|*.PFX";
            if (openDialogCert.ShowDialog() == DialogResult.OK)
            {
                Certificate cert = LoadCertificate(openDialogCert.FileName, RequestPassword());
                verifier.KnownCertificates.Add(cert);

                UpdateKnownCertificates();
            }
        }

        private void btnRemoveKnown_Click(object sender, EventArgs e)
        {
            if (lvKnownCertificates.SelectedItems.Count > 0)
            {
                verifier.KnownCertificates.RemoveAt(lvKnownCertificates.SelectedItems[0].Index);

                UpdateKnownCertificates();
            }
        }

        private void btnAddTrusted_Click(object sender, EventArgs e)
        {
            openDialogCert.Title = "Select certificate file";
            openDialogCert.Filter = "PEM-encoded certificate (*.pem)|*.PEM|DER-encoded certificate (*.cer)|*.CER|PFX-encoded certificate (*.pfx)|*.PFX";
            if (openDialogCert.ShowDialog() == DialogResult.OK)
            {
                Certificate cert = LoadCertificate(openDialogCert.FileName, RequestPassword());
                verifier.TrustedCertificates.Add(cert);

                UpdateTrustedCertificates();
            }
        }

        private void btnRemoveTrusted_Click(object sender, EventArgs e)
        {
            if (lvTrustedCertificates.SelectedItems.Count > 0)
            {
                verifier.TrustedCertificates.RemoveAt(lvTrustedCertificates.SelectedItems[0].Index);

                UpdateTrustedCertificates();
            }
        }
    }

    public class ValidationRes
    {
        public string SignatureName { get; set; }
        public string AuthorName { get; set; }
        public string Reason { get; set; }
        public string SigningTime { get; set; }
        public int Result { get; set; }
    }

    public class CertValidationRes
    {
        public string SignatureName { get; set; }
        public string SerialNumber { get; set; }
        public string IssuerRDN { get; set; }
        public string SubjectKeyID { get; set; }
        public int Result { get; set; }
        public int Reason { get; set; }
    }
}