Shark.PdfConvert

What is Shark.PdfConvert?

Shark.PdfConvert is a simple .NET Core (also targets net451) wrapper around the WkHtmlToPdf tool. Most options are exposed via a PdfConversionSettings object, others can be specified by using Custom overrides for the configuration area you want.

Conversion setting defaults are set for a Windows environment and assume you have the WkHTMLToPDF (x64) tool installed. You can override the Path to the tool by overridding PdfConversionSettings . PdfToolPath.

You will need to install/download WkHtmlToPdf, it is not embedded in the NuGet Package

Sample 1: Static HTML Content

PdfConvert.Convert(new PdfConversionSettings
{
    Title = "My Static Content",
    Content = @"<h1>Lorem ipsum dolor sit amet consectetuer adipiscing elit 
	    I SHOULD BE RED BY JAVASCRIPT</h1>
		<script>document.querySelector('h1').style.color = 'rgb(128,0,0)';</script>",
    OutputPath = @"C:\temp\temp.pdf"
});

Sample 2: Get Content from a URL

PdfConvert.Convert(new PdfConversionSettings
{
    Title = "My Static Content from URL",
    ContentUrl = "http://www.lipsum.com/",
    OutputPath = @"C:\temp\temp-url.pdf"
});

Sample 3: Use Streams for Output and Input

PdfConversionSettings config = new PdfConversionSettings
{
    Title = "Streaming my HTML to PDF"
};

using (var fileStream = new FileStream(Path.GetTempFileName() + ".pdf", FileMode.Create))
{
    var task = new System.Net.Http.HttpClient().GetStreamAsync("http://www.google.com");
    task.Wait();

    using (var inputStream = task.Result)
    {
		PdfConvert.Convert(config, fileStream, inputStream);
	}
}

Sample 4: Mix and Match

PdfConversionSettings config = new PdfConversionSettings
{
    Title = "A little bit of Everything",
    GenerateToc = true,
    TocHeaderText = "Table of MY Contents",
    PageCoverUrl = "https://blackrockdigital.github.io/startbootstrap-landing-page/",
    ContentUrl = "http://www.lipsum.com/",
    PageHeaderHtml = @"
        <!DOCTYPE html>
        <html><body>
        <div style=""background-color: red; color: white; text-align: center; width: 100vw;"">SECRET SAUCE</div>
        </body></html>"
};

using (var fileStream = new FileStream(Path.GetTempFileName() + ".pdf", FileMode.Create))
{
    PdfConvert.Convert(config, fileStream);
}

Sample 5: Usage inside MVC Controller Action

public IActionResult ConvertToPdf([FromBody] PdfConversionSettings model) 
{
	// TAKE CARE WHEN Accepting the Conversion Settings from user land, it would be best 
	// to just NOT DO it, accept your own custom model and map the parameters as needed.
	// If you insist, then you could do something like the following to prevent malicious code execution
	// in my testing the Custom*Args members are not a valid attack vector, PdfToolPath certainly is, never* trust
	// the client
#if DEBUG
    // set path to executable, UNSAFE DEBUG USE ONLY FOR TESTING
    model.PdfToolPath = model.PdfToolPath ?? _host.ContentRootPath + @"\wkhtmltopdf.exe";
#else
    // set path to executable
    model.PdfToolPath = _host.ContentRootPath + @"\wkhtmltopdf.exe";
#endif	  

    if (model.OutputFilename.EndsWith(".pdf") == false) model.OutputFilename = model.OutputFilename + ".pdf";

    var memoryStream = new MemoryStream();
    PdfConvert.Convert(model, memoryStream);
    return new FileContentResult(memoryStream.ToArray(), MimeTypes.Pdf)
    {
        FileDownloadName = model.OutputFileName
    };
}

Revision History

1.0.1 - Spoke to soon, updated the samples, they had a typo, small tweaks in the code, nothing breaking or signature modifying
1.0.0 - Should be stable going forward except for any bugs found. Modified Convert method signature to be a bit more sane, Added additional static content options, Added Url overrides if you wanted to have WkHTMLToPDF grab external sites for any portion of the generated document, exposed some process options
0.1.0 - Initial Upload

devalot76/Shark.PdfConvert