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feat(sender-editor): add PDF page rendering pipeline

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This commit is contained in:
tekh
2026-09-29 19:21:51 +02:00
parent ed44d841e7
commit 7a114f47a6
11 changed files with 173 additions and 0 deletions
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16
EnvelopeGenerator.Application/Common/Dto/PdfPageImageDto.cs Normal file
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@@ -0,0 +1,16 @@
namespace EnvelopeGenerator.Application.Common.Dto;
public sealed class PdfPageImageDto
{
public int PageNumber { get; init; }
public double WidthPt { get; init; }
public double HeightPt { get; init; }
public int WidthPx { get; init; }
public int HeightPx { get; init; }
public string ImageDataUrl { get; init; } = string.Empty;
}

6
EnvelopeGenerator.Application/Common/Dto/PdfRenderRequestDto.cs Normal file
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@@ -0,0 +1,6 @@
namespace EnvelopeGenerator.Application.Common.Dto;
public sealed class PdfRenderRequestDto
{
public byte[]? PdfBytes { get; init; }
}

8
EnvelopeGenerator.Application/Common/Interfaces/Doc/IPdfPageImageRenderer.cs Normal file
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@@ -0,0 +1,8 @@
using EnvelopeGenerator.Application.Common.Dto;
namespace EnvelopeGenerator.Application.Common.Interfaces.Doc;
public interface IPdfPageImageRenderer
{
Task<IReadOnlyList<PdfPageImageDto>> RenderPagesAsImagesAsync(byte[] pdfBytes, CancellationToken cancellationToken = default);
}

17
EnvelopeGenerator.Infrastructure.Doc/EnvelopeGenerator.Infrastructure.Doc.csproj Normal file
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@@ -0,0 +1,17 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\EnvelopeGenerator.Application\EnvelopeGenerator.Application.csproj" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="DevExpress.Document.Processor" Version="25.2.3" />
</ItemGroup>
</Project>

57
EnvelopeGenerator.Infrastructure.Doc/PdfPageImageRenderer.cs Normal file
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@@ -0,0 +1,57 @@
using DevExpress.Drawing;
using DevExpress.Pdf;
using EnvelopeGenerator.Application.Common.Dto;
using EnvelopeGenerator.Application.Common.Interfaces.Doc;
namespace EnvelopeGenerator.Infrastructure.Doc;
public class PdfPageImageRenderer : IPdfPageImageRenderer
{
private const float RenderDpi = 110f;
public Task<IReadOnlyList<PdfPageImageDto>> RenderPagesAsImagesAsync(byte[] pdfBytes, CancellationToken cancellationToken = default)
{
ArgumentNullException.ThrowIfNull(pdfBytes);
if (pdfBytes.Length == 0)
return Task.FromResult<IReadOnlyList<PdfPageImageDto>>(Array.Empty<PdfPageImageDto>());
using var stream = new MemoryStream(pdfBytes, writable: false);
using var processor = new PdfDocumentProcessor();
processor.LoadDocument(stream);
var pages = processor.Document.Pages;
if (pages.Count == 0)
return Task.FromResult<IReadOnlyList<PdfPageImageDto>>(Array.Empty<PdfPageImageDto>());
var renderOptions = PdfPageRenderingParameters.CreateWithResolution(RenderDpi);
var results = new List<PdfPageImageDto>(pages.Count);
for (var i = 0; i < pages.Count; i++)
{
cancellationToken.ThrowIfCancellationRequested();
var pageNumber = i + 1;
var page = pages[i];
var cropBox = page.CropBox;
using DXBitmap bitmap = processor.CreateDXBitmap(pageNumber, renderOptions);
using var imageStream = new MemoryStream();
bitmap.Save(imageStream, DXImageFormat.Png);
var dataUrl = $"data:image/png;base64,{Convert.ToBase64String(imageStream.ToArray())}";
results.Add(new PdfPageImageDto
{
PageNumber = pageNumber,
WidthPt = cropBox.Width,
HeightPt = cropBox.Height,
WidthPx = bitmap.Width,
HeightPx = bitmap.Height,
ImageDataUrl = dataUrl
});
}
return Task.FromResult<IReadOnlyList<PdfPageImageDto>>(results);
}
}

1
EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Program.cs
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@@ -43,6 +43,7 @@ builder.Services.AddSingleton<AppVersionService>();
builder.Services.AddScoped<EnvelopeService>();
builder.Services.AddScoped<LocalizationService>();
builder.Services.AddScoped<ReceiverService>();
builder.Services.AddScoped<PdfRenderService>();
// UI Preferences & Theme
builder.Services.AddScoped<UserPreferencesService>();

32
EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/PdfRenderService.cs Normal file
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@@ -0,0 +1,32 @@
using System.Net.Http.Json;
using System.Text.Json;
using EnvelopeGenerator.Application.Common.Dto;
namespace EnvelopeGenerator.Server.Client.Services;
public class PdfRenderService(IHttpClientFactory httpClientFactory)
{
private static readonly JsonSerializerOptions _jsonOptions = new(JsonSerializerDefaults.Web);
public async Task<IReadOnlyList<PdfPageImageDto>> RenderPagesAsync(byte[] pdfBytes, CancellationToken cancel = default)
{
using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
using var response = await http.PostAsJsonAsync(
"/api/PdfRender/pages",
new PdfRenderRequestDto { PdfBytes = pdfBytes },
_jsonOptions,
cancel);
if (!response.IsSuccessStatusCode)
{
var statusCode = (int)response.StatusCode;
var reasonPhrase = response.ReasonPhrase ?? "Unknown error";
throw new HttpRequestException(
$"Failed to render PDF pages. Status: {statusCode} ({reasonPhrase})",
null,
response.StatusCode);
}
return await response.Content.ReadFromJsonAsync<List<PdfPageImageDto>>(_jsonOptions, cancel) ?? [];
}
}

24
EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/PdfRenderController.cs Normal file
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@@ -0,0 +1,24 @@
using DigitalData.Auth.Claims;
using EnvelopeGenerator.Application.Common.Dto;
using EnvelopeGenerator.Application.Common.Interfaces.Doc;
using EnvelopeGenerator.Domain.Constants;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
namespace EnvelopeGenerator.Server.Controllers;
[ApiController]
[Route("api/[controller]")]
public class PdfRenderController(IPdfPageImageRenderer renderer) : ControllerBase
{
[HttpPost("pages")]
[Authorize(AuthenticationSchemes = AuthScheme.Sender)]
public async Task<IActionResult> RenderPages([FromBody] PdfRenderRequestDto? request, CancellationToken cancel)
{
if (request?.PdfBytes is not { Length: > 0 } bytes)
return BadRequest("Missing PDF bytes.");
IReadOnlyList<PdfPageImageDto> pages = await renderer.RenderPagesAsImagesAsync(bytes, cancel);
return Ok(pages);
}
}

1
EnvelopeGenerator.Server/EnvelopeGenerator.Server/EnvelopeGenerator.Server.csproj
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@@ -21,6 +21,7 @@
<ProjectReference Include="..\EnvelopeGenerator.Server.Client\EnvelopeGenerator.Server.Client.csproj" />
<ProjectReference Include="..\..\EnvelopeGenerator.Application\EnvelopeGenerator.Application.csproj" />
<ProjectReference Include="..\..\EnvelopeGenerator.Domain\EnvelopeGenerator.Domain.csproj" />
<ProjectReference Include="..\..\EnvelopeGenerator.Infrastructure.Doc\EnvelopeGenerator.Infrastructure.Doc.csproj" />
<ProjectReference Include="..\..\EnvelopeGenerator.Infrastructure\EnvelopeGenerator.Infrastructure.csproj" />
<ProjectReference Include="..\..\EnvelopeGenerator.PdfEditor\EnvelopeGenerator.PdfEditor.csproj" />
</ItemGroup>

4
EnvelopeGenerator.Server/EnvelopeGenerator.Server/Program.cs
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@@ -26,6 +26,8 @@ using NLog;
using DigitalData.Auth.Claims;
using EnvelopeGenerator.Server;
using DigitalData.EmailProfilerDispatcher;
using EnvelopeGenerator.Application.Common.Interfaces.Doc;
using EnvelopeGenerator.Infrastructure.Doc;
var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
logger.Info("EnvelopeGenerator.Server logging initialized!");
@@ -342,6 +344,7 @@ try
builder.Services.AddScoped<EnvelopeGenerator.Server.Client.Services.CustomImagesService>();
builder.Services.AddScoped<EnvelopeGenerator.Server.Client.Services.LocalizationService>();
builder.Services.AddScoped<EnvelopeGenerator.Server.Client.Services.ReceiverService>();
builder.Services.AddScoped<EnvelopeGenerator.Server.Client.Services.PdfRenderService>();
// Business Services (Server specific)
builder.Services.AddScoped<DocumentService>();
@@ -350,6 +353,7 @@ try
builder.Services.AddScoped<EnvelopeReceiverService>();
builder.Services.AddScoped<SignatureService>();
builder.Services.AddScoped<SignatureCacheService>();
builder.Services.AddScoped<IPdfPageImageRenderer, PdfPageImageRenderer>();
builder.Services.AddScoped<EnvelopeGenerator.Application.Common.Interfaces.Services.IEnvelopeMailService, EnvelopeGenerator.Application.Services.EnvelopeMailService>();
builder.Services.AddSingleton<AppVersionService>();

7
EnvelopeGenerator.sln
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@@ -51,6 +51,8 @@ Project("{F184B08F-C81C-45F6-A57F-5ABD9991F28F}") = "EnvelopeGenerator.Service_l
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EnvelopeGenerator.Service", "EnvelopeGenerator.Service\EnvelopeGenerator.Service.csproj", "{6B87FB5F-F4EA-45BE-A218-385DC2CE8E80}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EnvelopeGenerator.Infrastructure.Doc", "EnvelopeGenerator.Infrastructure.Doc\EnvelopeGenerator.Infrastructure.Doc.csproj", "{3B6EFE8D-F1EE-4666-87A0-9F90149CC61A}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -113,6 +115,10 @@ Global
{6B87FB5F-F4EA-45BE-A218-385DC2CE8E80}.Debug|Any CPU.Build.0 = Debug|Any CPU
{6B87FB5F-F4EA-45BE-A218-385DC2CE8E80}.Release|Any CPU.ActiveCfg = Release|Any CPU
{6B87FB5F-F4EA-45BE-A218-385DC2CE8E80}.Release|Any CPU.Build.0 = Release|Any CPU
{3B6EFE8D-F1EE-4666-87A0-9F90149CC61A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{3B6EFE8D-F1EE-4666-87A0-9F90149CC61A}.Debug|Any CPU.Build.0 = Debug|Any CPU
{3B6EFE8D-F1EE-4666-87A0-9F90149CC61A}.Release|Any CPU.ActiveCfg = Release|Any CPU
{3B6EFE8D-F1EE-4666-87A0-9F90149CC61A}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
@@ -136,6 +142,7 @@ Global
{9C41A0B1-6AFE-AFC5-CE33-08052F45DAEF} = {BF1700D5-592E-4FFA-84E8-5480E289A1F0}
{83ED2617-B398-4859-8F59-B38F8807E83E} = {9943209E-1744-4944-B1BA-4F87FC1A0EEB}
{6B87FB5F-F4EA-45BE-A218-385DC2CE8E80} = {E3C758DC-914D-4B7E-8457-0813F1FDB0CB}
{3B6EFE8D-F1EE-4666-87A0-9F90149CC61A} = {02EA681E-C7D8-13C7-8484-4AC65E1B71E8}
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {73E60370-756D-45AD-A19A-C40A02DACCC7}