/*
 * 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 System.Collections.Generic;
using nsoftware.SecureBlackbox;

/// <summary>
/// Summary description for frmMain.
/// </summary>
public class frmMain : System.Windows.Forms.Form
{
    private System.Windows.Forms.OpenFileDialog dlgOpen;
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.Container components = null;

    private SignForm frmSign = null;
    private ReferencesForm frmReferences;
    private XAdESForm frmXAdES;

    private XAdESVerifier verifier;
    private CheckBox cbDetached;
    private TextBox edDataFile;
    private Button sbBrowseDataFile;
    private Label lDataFile;
    private TextBox edXMLFile;
    private Button btnVerify;
    private Button sbBrowseXMLFile;
    private Label lbXMLFile;
    private Label label1;
    private Label label2;
    private List<ReferenceRes> ReferenceResult = new List<ReferenceRes>();

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

        //
        // TODO: Add any constructor code after InitializeComponent call
        //
        verifier = new XAdESVerifier();
        verifier.OnReferenceValidated += new XAdESVerifier.OnReferenceValidatedHandler(ReferenceValidated);
        verifier.OnSignatureFound += new XAdESVerifier.OnSignatureFoundHandler(SignatureFound);
        verifier.OnTimestampValidated += new XAdESVerifier.OnTimestampValidatedHandler(TimestampValidated);

        frmSign = new SignForm(verifier);
        frmReferences = new ReferencesForm();
        frmXAdES = new XAdESForm();
    }

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

    private void ReferenceValidated(object s, XAdESVerifierReferenceValidatedEventArgs e)
    {
        ReferenceResult.Add(new ReferenceRes() { Id = e.ID, Uri = e.URI, RefType = e.RefType, DigestValid = e.DigestValid });
    }

    private void SignatureFound(object s, XAdESVerifierSignatureFoundEventArgs e)
    {
        if (e.CertFound)
        {
            e.ValidateSignature = true;
            e.ValidateChain = true;
        }
        else
        {
            switch (verifier.Signatures[e.Index].CanonicalizationMethod)
            {
                case XMLCanonicalizationMethods.cxcmCanon:
                    {
                        frmSign.edCanonMethod.Text = "Canonical";
                        break;
                    }
                case XMLCanonicalizationMethods.cxcmCanonComment:
                    {
                        frmSign.edCanonMethod.Text = "Canonical with comments";
                        break;
                    }
                case XMLCanonicalizationMethods.cxcmCanon_v1_1:
                    {
                        frmSign.edCanonMethod.Text = "Canonical v1.1";
                        break;
                    }
                case XMLCanonicalizationMethods.cxcmCanonComment_v1_1:
                    {
                        frmSign.edCanonMethod.Text = "Canonical with comments v1.1";
                        break;
                    }
                case XMLCanonicalizationMethods.cxcmExclCanon:
                    {
                        frmSign.edCanonMethod.Text = "Exclusive canonical";
                        break;
                    }
                case XMLCanonicalizationMethods.cxcmExclCanonComment:
                    {
                        frmSign.edCanonMethod.Text = "Exclusive canonical with comments";
                        break;
                    }
                case XMLCanonicalizationMethods.cxcmMinCanon:
                    {
                        frmSign.edCanonMethod.Text = "Minimal canonical";
                        break;
                    }
                default:
                    {
                        frmSign.edCanonMethod.Text = "Unknown";
                        break;
                    }
            }

            frmSign.edHashAlgorithm.Text = verifier.Signatures[e.Index].HashAlgorithm;

            frmSign.edKeyName.Text = verifier.Config("KeyName");
            frmSign.UpdateCertificates();

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

    private void TimestampValidated(object s, XAdESVerifierTimestampValidatedEventArgs e)
    {
        if (e.ValidationResult == 0)//cvtValid
        {
            frmXAdES.lbTimestamp.Text = "Timestamp: " + e.Time;
            frmXAdES.lbTimestampSerial.Text = "Timestamp Serial: " + BitConverter.ToString(e.SerialNumber);
        }
        else
        {
            frmXAdES.lbTimestamp.Text = "Timestamp signature is not valid";
            frmXAdES.lbTimestampSerial.Text = "";
        }
    }

    #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.dlgOpen = new System.Windows.Forms.OpenFileDialog();
            this.cbDetached = new System.Windows.Forms.CheckBox();
            this.edDataFile = new System.Windows.Forms.TextBox();
            this.sbBrowseDataFile = new System.Windows.Forms.Button();
            this.lDataFile = new System.Windows.Forms.Label();
            this.edXMLFile = new System.Windows.Forms.TextBox();
            this.btnVerify = new System.Windows.Forms.Button();
            this.sbBrowseXMLFile = new System.Windows.Forms.Button();
            this.lbXMLFile = new System.Windows.Forms.Label();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // dlgOpen
            // 
            this.dlgOpen.Filter = "XML file (*.xml)|*.XML";
            // 
            // cbDetached
            // 
            this.cbDetached.AutoSize = true;
            this.cbDetached.Location = new System.Drawing.Point(8, 79);
            this.cbDetached.Name = "cbDetached";
            this.cbDetached.Size = new System.Drawing.Size(73, 17);
            this.cbDetached.TabIndex = 20;
            this.cbDetached.Text = "Detached";
            this.cbDetached.UseVisualStyleBackColor = true;
            this.cbDetached.CheckedChanged += new System.EventHandler(this.cbDetached_CheckedChanged);
            // 
            // edDataFile
            // 
            this.edDataFile.Enabled = false;
            this.edDataFile.Location = new System.Drawing.Point(61, 101);
            this.edDataFile.Name = "edDataFile";
            this.edDataFile.Size = new System.Drawing.Size(239, 20);
            this.edDataFile.TabIndex = 18;
            // 
            // sbBrowseDataFile
            // 
            this.sbBrowseDataFile.Enabled = false;
            this.sbBrowseDataFile.Location = new System.Drawing.Point(304, 98);
            this.sbBrowseDataFile.Name = "sbBrowseDataFile";
            this.sbBrowseDataFile.Size = new System.Drawing.Size(75, 25);
            this.sbBrowseDataFile.TabIndex = 19;
            this.sbBrowseDataFile.Text = "Browse ...";
            this.sbBrowseDataFile.Click += new System.EventHandler(this.sbBrowseDataFile_Click);
            // 
            // lDataFile
            // 
            this.lDataFile.AutoSize = true;
            this.lDataFile.Enabled = false;
            this.lDataFile.Location = new System.Drawing.Point(6, 104);
            this.lDataFile.Name = "lDataFile";
            this.lDataFile.Size = new System.Drawing.Size(49, 13);
            this.lDataFile.TabIndex = 17;
            this.lDataFile.Text = "Data file:";
            // 
            // edXMLFile
            // 
            this.edXMLFile.Location = new System.Drawing.Point(61, 49);
            this.edXMLFile.Name = "edXMLFile";
            this.edXMLFile.Size = new System.Drawing.Size(239, 20);
            this.edXMLFile.TabIndex = 14;
            // 
            // btnVerify
            // 
            this.btnVerify.Location = new System.Drawing.Point(304, 145);
            this.btnVerify.Name = "btnVerify";
            this.btnVerify.Size = new System.Drawing.Size(75, 25);
            this.btnVerify.TabIndex = 16;
            this.btnVerify.Text = "Verify";
            this.btnVerify.Click += new System.EventHandler(this.btnVerify_Click);
            // 
            // sbBrowseXMLFile
            // 
            this.sbBrowseXMLFile.Location = new System.Drawing.Point(304, 46);
            this.sbBrowseXMLFile.Name = "sbBrowseXMLFile";
            this.sbBrowseXMLFile.Size = new System.Drawing.Size(75, 25);
            this.sbBrowseXMLFile.TabIndex = 15;
            this.sbBrowseXMLFile.Text = "Browse ...";
            this.sbBrowseXMLFile.Click += new System.EventHandler(this.sbBrowseXMLFile_Click);
            // 
            // lbXMLFile
            // 
            this.lbXMLFile.AutoSize = true;
            this.lbXMLFile.Location = new System.Drawing.Point(5, 52);
            this.lbXMLFile.Name = "lbXMLFile";
            this.lbXMLFile.Size = new System.Drawing.Size(50, 13);
            this.lbXMLFile.TabIndex = 13;
            this.lbXMLFile.Text = "Input file:";
            // 
            // 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(253, 13);
            this.label1.TabIndex = 21;
            this.label1.Text = "This sample shows processing of XAdES signatures.";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.ForeColor = System.Drawing.SystemColors.Highlight;
            this.label2.Location = new System.Drawing.Point(6, 23);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(294, 13);
            this.label2.TabIndex = 22;
            this.label2.Text = "Please select a signed XML file and click \'Verify\' when ready.";
            // 
            // frmMain
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(387, 178);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.cbDetached);
            this.Controls.Add(this.edDataFile);
            this.Controls.Add(this.sbBrowseDataFile);
            this.Controls.Add(this.lDataFile);
            this.Controls.Add(this.edXMLFile);
            this.Controls.Add(this.btnVerify);
            this.Controls.Add(this.sbBrowseXMLFile);
            this.Controls.Add(this.lbXMLFile);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Name = "frmMain";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "XAdES Verifier Demo";
            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 sbBrowseXMLFile_Click(object sender, System.EventArgs e)
    {
        dlgOpen.InitialDirectory = Application.StartupPath;
        dlgOpen.FileName = edXMLFile.Text;
        if (dlgOpen.ShowDialog() == DialogResult.OK)
            edXMLFile.Text = dlgOpen.FileName;
    }

    private void btnVerify_Click(object sender, EventArgs e)
    {
        try
        {
            ReferenceResult.Clear();
            frmXAdES.lbTimestamp.Text = "";
            frmXAdES.lbTimestampSerial.Text = "";

            verifier.KnownCertificates.Clear();
            verifier.InputFile = edXMLFile.Text;

            if (cbDetached.Checked)
            {
                verifier.DataFile = edDataFile.Text;
                verifier.DataURI = System.IO.Path.GetFileName(edDataFile.Text);
                verifier.DataType = XAdESVerifierDataTypes.cxdtBinary;
                verifier.VerifyDetached();
            }
            else
                verifier.Verify();

            if (verifier.Signatures.Count == 0)
                MessageBox.Show("No signatures found", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
            else
            {
                for (int i = 0; i < verifier.Signatures.Count; i++)
                {
                    XAdESSignature sig = verifier.Signatures[i];
                    switch (sig.SignatureValidationResult)
                    {
                        case SignatureValidities.svtSignerNotFound:
                            {
                                MessageBox.Show("Signer not found", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                                break;
                            }
                        case SignatureValidities.svtFailure:
                            {
                                MessageBox.Show("Signature verification failed", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                                break;
                            }
                        case SignatureValidities.svtCorrupted:
                            {
                                MessageBox.Show("Signature is invalid", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                                break;
                            }
                        case SignatureValidities.svtReferenceCorrupted:
                            {
                                if (MessageBox.Show("Signature is invalid (reference corrupted)\r\nDo you want to see the result of verifying references?", "", MessageBoxButtons.YesNo, MessageBoxIcon.Error) == DialogResult.Yes)
                                {
                                    frmReferences.Update(ReferenceResult);
                                    frmReferences.ShowDialog();
                                }
                                break;
                            }
                        case SignatureValidities.svtValid:
                            {
                                Boolean SigOK = true;

                                if (sig.ChainValidationResult == ChainValidities.cvtValidButUntrusted)
                                    MessageBox.Show("The selected signature is signed by self-signed certificate which was not previously trusted", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
                                else if (sig.ChainValidationResult != ChainValidities.cvtValid)
                                {
                                    //SigOK = false;
                                    if (sig.ChainValidationResult == ChainValidities.cvtCantBeEstablished)
                                        MessageBox.Show("Signing certificate chain could not be validated completely.", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                                    else
                                        MessageBox.Show("Signing certificate is not valid.", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                                }

                                if (SigOK)
                                {
                                    if (MessageBox.Show("Signature validated successfully.\r\nDo you want to see the result of verifying references?", "", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
                                    {
                                        frmReferences.Update(ReferenceResult);
                                        frmReferences.ShowDialog();
                                    }

                                    if (sig.Level != AdESSignatureLevels.aslGeneric)
                                    {
                                        if (MessageBox.Show("Do you want to view XAdES information?", "", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
                                        {
                                            switch (sig.XAdESVersion)
                                            {
                                                case XAdESVersions.xav111:
                                                    {
                                                        frmXAdES.cmbVersion.SelectedIndex = 0;
                                                        break;
                                                    }
                                                case XAdESVersions.xav122:
                                                    {
                                                        frmXAdES.cmbVersion.SelectedIndex = 1;
                                                        break;
                                                    }
                                                case XAdESVersions.xav132:
                                                    {
                                                        frmXAdES.cmbVersion.SelectedIndex = 2;
                                                        break;
                                                    }
                                                case XAdESVersions.xav141:
                                                    {
                                                        frmXAdES.cmbVersion.SelectedIndex = 3;
                                                        break;
                                                    }
                                                default:
                                                    {
                                                        frmXAdES.cmbVersion.SelectedIndex = -1;
                                                        break;
                                                    }
                                            }

                                            switch (sig.Level)
                                            {
                                                case AdESSignatureLevels.aslGeneric:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 0;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslBaselineB:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 1;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslBaselineT:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 2;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslBaselineLT:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 3;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslBaselineLTA:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 4;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslBES:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 5;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslEPES:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 6;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslT:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 7;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslC:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 8;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslX:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 9;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslXL:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 10;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslA:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 11;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedBES:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 12;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedEPES:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 13;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedT:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 14;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedC:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 15;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedX:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 16;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedXLong:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 17;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedXL:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 18;
                                                        break;
                                                    }
                                                case AdESSignatureLevels.aslExtendedA:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = 19;
                                                        break;
                                                    }
                                                default:
                                                    {
                                                        frmXAdES.cmbForm.SelectedIndex = -1;
                                                        break;
                                                    }
                                            }

                                            if (sig.ValidatedSigningTime != "")
                                                frmXAdES.lbSignedTime.Text = "Validated Signing Time: " + sig.ValidatedSigningTime + " UTC";
                                            else if (sig.ClaimedSigningTime != "")
                                                frmXAdES.lbSignedTime.Text = "Claimed Signing Time: " + sig.ClaimedSigningTime + " UTC";
                                            else
                                                frmXAdES.lbSignedTime.Text = "";

                                            frmXAdES.ShowDialog();
                                        }
                                    }
                                }
                                break;
                            }

                        default:
                            MessageBox.Show("Signature is invalid (unknown validation result)", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            break;
                    }
                }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    private void cbDetached_CheckedChanged(object sender, EventArgs e)
    {
        edDataFile.Enabled = cbDetached.Checked;
        sbBrowseDataFile.Enabled = cbDetached.Checked;
        lDataFile.Enabled = cbDetached.Checked;
    }

    private void sbBrowseDataFile_Click(object sender, EventArgs e)
    {
        dlgOpen.InitialDirectory = Application.StartupPath;
        dlgOpen.FileName = edDataFile.Text;
        if (dlgOpen.ShowDialog() == DialogResult.OK)
            edDataFile.Text = dlgOpen.FileName;
    }
}

public class ReferenceRes
{
    public string Id { get; set; }
    public string Uri { get; set; }
    public string RefType { get; set; }
    public bool DigestValid { get; set; }
}