//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using System.Text.RegularExpressions;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Pdf.Annotations;using GrapeCity.Documents.Pdf.TextMap;using GrapeCity.Documents.Pdf.AcroForms;
namespace DsPdfWeb.Demos{    // This sample shows how to use the text map to find specific content     // in a PDF and mark it for redaction.    // Check out the ApplyRedact sample to see how the redact annotations    // added by this sample can be applied to actually erase the data.    // Also check out the samples in DsPdfViewer section to see how    // redact annotations (added programmatically as in this sample,    // or via the viewer's UI) can be applied selectively or all together.    // The PDF used in this sample was created by TimeSheet.    public class FindAndRedact    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "TimeSheet.pdf"));            doc.Load(fs);
            // Note: Acrobat does not allow applying redactions in a digitally signed            // document, so first we find and remove any existing signatures:            removeSignatureFields(doc.AcroForm.Fields);
            // Loop through pages, removing anything that looks like a short date:            foreach (var page in doc.Pages)            {                var tmap = page.GetTextMap();                foreach (ITextLine tline in tmap)                {                    if (Regex.Match(tline.Text.Trim(), @"\d+[/-]\w+[/-]\d").Success)                    {                        var redact = new RedactAnnotation()                        {                            Rect = tline.GetCoords().ToRect(),                            MarkBorderColor = Color.Red,                            MarkFillColor = Color.Yellow,                            Page = page                        };                        // If we hadn't already set redact.Page = page, we could do this:                        // page.Annotations.Add(redact);                    }                }            }            // Done:            doc.Save(stream);            return doc.Pages.Count;
            // This code is from the RemoveSignatureFields sample:            static void removeSignatureFields(FieldCollection fields)            {                for (int i = fields.Count - 1; i >= 0; --i)                {                    removeSignatureFields(fields[i].Children);                    if (fields[i] is SignatureField)                        fields.RemoveAt(i);                }            }        }
        // Viewer options for SupportApiDemo:        public static GcPdfViewerSupportApiDemo.Models.PdfViewerOptions PdfViewerOptions        {            get => new GcPdfViewerSupportApiDemo.Models.PdfViewerOptions(                GcPdfViewerSupportApiDemo.Models.PdfViewerOptions.Options.AnnotationEditorPanel |                GcPdfViewerSupportApiDemo.Models.PdfViewerOptions.Options.ActivateAnnotationEditor,                viewerTools: new string[] { "save", "edit-redact-apply", "$split", "text-selection", "pan", "$zoom", "$fullscreen", "print", "rotate", "download", "doc-properties", "about" },                annotationEditorTools: new string[] { "save", "edit-redact", "edit-redact-apply" });        }    }}