TekH
67d0b07926
Extended `DocReceiverElementDto` to include an optional `Document` reference. Enhanced `ReadDocReceiverElementQuery` with `Id` and `IncludeDocument` properties for filtering and document inclusion. Updated `ReadDocReceiverElementQueryHandler` to handle new query properties, enabling filtering by `Id` and optionally including associated documents. Introduced `SignPdfByElementCommand` and its handler to support signing PDFs using either a provided `DocReceiverElementDto` or an `ElementId`. Added validation via `SignPdfByElementCommandValidator` to ensure proper usage. Refactored and added necessary `using` directives for new dependencies.
85 lines
2.7 KiB
C#
85 lines
2.7 KiB
C#
using DigitalData.Core.Exceptions;
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using EnvelopeGenerator.Application.Common.Dto;
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using EnvelopeGenerator.Application.Common.Interfaces.Doc;
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using EnvelopeGenerator.Application.Common.Interfaces.Services;
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using EnvelopeGenerator.Application.DocReceiverElements.Queries;
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using MediatR;
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namespace EnvelopeGenerator.Application.PdfSigning;
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/// <summary>
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///
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/// </summary>
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public record SignPdfByElementCommand : IRequest<Stream>
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{
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/// <summary>
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///
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/// </summary>
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public DocReceiverElementDto? Element { get; set; }
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/// <summary>
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///
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/// </summary>
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public int? ElementId { get; init; }
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="signService"></param>
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public class SignPdfCommandHandler(ISender sender, IPdfDigitalSignatureService signService, IPdfPageImageRenderer imgRenderer) : IRequestHandler<SignPdfByElementCommand, Stream>
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{
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/// <summary>
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///
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/// </summary>
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/// <param name="request"></param>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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public async Task<Stream> Handle(SignPdfByElementCommand request, CancellationToken cancellationToken)
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{
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// ensure element
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if(request.Element is null)
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{
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var elements = await sender.Send(new ReadDocReceiverElementQuery()
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{
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Id = request.ElementId!,
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IncludeDocument= true
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}, cancellationToken);
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if (!elements.Any())
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throw new NotFoundException($"Element with ID {request.ElementId} not found.");
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request.Element = elements.FirstOrDefault();
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}
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// ensure document
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var doc = request.Element!.Document;
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if(doc is null || doc.ByteData is null || doc.ByteData.Length == 0)
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throw new NotFoundException("Document data is missing or empty.");
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// create signature image from element
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var img = imgRenderer.ComposeSignaturePreviewPng(request.Element);
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// sign pdf
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var inputPdf = new MemoryStream(doc.ByteData);
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var outputPdf = new MemoryStream();
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await signService.SignPdfAsync(
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inputPdf: inputPdf,
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outputPdf: outputPdf,
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options: new PdfSignOptionsDto
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{
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Appearance = new PdfSignatureAppearanceDto(
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PageNumber: request.Element.Page,
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Left: request.Element.Left,
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Bottom: request.Element.Y,
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Width: request.Element.Width,
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Height: request.Element.Height)
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},
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image: img,
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cancellationToken: cancellationToken);
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return outputPdf;
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}
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} |