/// <summary>
/// Builds the outline asynchronous.
/// </summary>
/// <param name="coverIncluded">if set to <c>true</c> indicates a cover is included in the PDF.</param>
/// <param name="tableOfContentsIncluded">if set to <c>true</c> indicates a table of contents is included in the PDF.</param>
/// <param name="outputDottedLinesInTableOfContents">if set to <c>true</c> outputs dotted lines in the table of contents.</param>
/// <param name="htmlToPdfFiles">The HTML to PDF files.</param>
/// <param name="outlineBuilder">The outline builder.</param>
/// <param name="defaultTableOfContentsStyleSheetBuilder">The default table of contents style sheet builder.</param>
/// <param name="pdfPrinter">The PDF printer.</param>
/// <param name="htmlToPdfOptions">The HTML to PDF options.</param>
/// <param name="variables">The variables.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
internal static async Task BuildOutlineAsync(
bool coverIncluded,
bool tableOfContentsIncluded,
bool outputDottedLinesInTableOfContents,
ConcurrentBag <HtmlToPdfFile> htmlToPdfFiles,
Action <XmlWriter, IReadOnlyCollection <HtmlToPdfFile>, bool> outlineBuilder,
Func <bool, string> defaultTableOfContentsStyleSheetBuilder,
PdfPrinter pdfPrinter,
HtmlToPdfOptions htmlToPdfOptions,
Dictionary <string, string> variables)
{
int tocIndex = coverIncluded ? 1 : 0;
int tocPageNumber = htmlToPdfFiles.Where(x => x.Index < tocIndex).Sum(x => x.NumberOfPages) + 1;
foreach (HtmlToPdfFile htmlToPdfFile in htmlToPdfFiles.Where(x => x.Index >= tocIndex))
{
htmlToPdfFile.Index += 1;
}
HtmlToPdfFile tocHtmlToPdfFile = new HtmlToPdfFile
{
Index = tocIndex,
// TODO: extract wkhtmltopdf specific details
Input = Path.Combine(Path.GetTempPath(), "__WKANCHOR_2").ToLower(),
// TODO: localization
Title = "Table of Contents",
TitleAndHeadings = new List <HtmlHeading>
{
new HtmlHeading
{
Level = 0,
Page = 0,
Text = "Table of Contents",
},
new HtmlHeading
{
Level = 1,
Page = tocPageNumber,
Text = "Table of Contents",
},
},
};
htmlToPdfFiles.Add(tocHtmlToPdfFile);
using (TempHtmlFile tempHtmlFile = new TempHtmlFile())
{
string defaultTocXsl = defaultTableOfContentsStyleSheetBuilder(outputDottedLinesInTableOfContents);
using (StringReader stringReader = new StringReader(defaultTocXsl))
{
using (XmlReader tocXslXmlReader = XmlReader.Create(stringReader))
{
XslCompiledTransform xslCompiledTransform = new XslCompiledTransform();
xslCompiledTransform.Load(tocXslXmlReader);
using (MemoryStream memoryStream = new MemoryStream())
{
using (XmlWriter xmlWriter = XmlWriter.Create(memoryStream))
{
outlineBuilder(xmlWriter, htmlToPdfFiles, tableOfContentsIncluded);
}
// Reset stream position to read from the beginning
memoryStream.Seek(0, SeekOrigin.Begin);
using (XmlReader xmlReader = XmlReader.Create(memoryStream))
{
using (XmlWriter xmlWriter = XmlWriter.Create(tempHtmlFile.FilePath))
{
xslCompiledTransform.Transform(xmlReader, xmlWriter);
}
}
}
}
}
// print as pdf
string pdfFile = await pdfPrinter.PrintAsPdfAsync(
tempHtmlFile.FilePath,
htmlToPdfOptions,
variables,
false);
int numberOfPages = PdfDocument.CountNumberOfPages(pdfFile);
tocHtmlToPdfFile.PdfFilePath = pdfFile;
tocHtmlToPdfFile.NumberOfPages = numberOfPages;
}
}
/// <summary>
/// Converts the HTML files to a PDF.
/// </summary>
/// <param name="options">The options.</param>
/// <param name="logger">The logger.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public static async Task <ConcurrentBag <HtmlToPdfFile> > ProcessAsync(Options options, ILogger logger)
{
DateTime dtNow = DateTime.Now; // local time
Encoding encoding = Encoding.Default;
if (!string.IsNullOrEmpty(options.Encoding))
{
encoding = Encoding.GetEncoding(options.Encoding);
}
if (!options.Inputs.Any() &&
!options.DumpDefaultTocXsl)
{
throw new ApplicationException($"At least one input must be specified.");
}
if (string.IsNullOrEmpty(options.OutputFilePath) &&
!options.DumpDefaultTocXsl)
{
throw new ApplicationException($"An output must be specified.");
}
if (options.DumpDefaultTocXsl)
{
string defaultTocXsl = options.DefaultTableOfContentsStyleSheetBuilder(options.OutputDottedLinesInTableOfContents);
logger.LogOutput(defaultTocXsl);
}
ConcurrentBag <HtmlToPdfFile> htmlToPdfFiles = new ConcurrentBag <HtmlToPdfFile>();
foreach (string input in options.Inputs)
{
logger.LogDebug(input);
}
string outputFilePath = options.OutputFilePath;
options.UserStyleSheet = options.UserStyleSheet?.Trim('"');
string title = options.Title;
BrowserDownloader.DownloadBrowser(logger);
using (TempDirectory tempDirectory = new TempDirectory())
{
var launchOptions = new LaunchOptions
{
SlowMo = 0,
Headless = true,
Timeout = 0,
LogProcess = false,
EnqueueTransportMessages = true,
Devtools = false,
WebSocketFactory = WebSocketFactory,
UserDataDir = tempDirectory.DirectoryPath,
Args = options.AdditionalArguments?.ToArray() ?? new string[] { },
};
MarginOptions marginOptions = new MarginOptions
{
Bottom = options.BottomMargin,
Left = options.LeftMargin,
Right = options.RightMargin,
Top = options.TopMargin,
};
await Policy
.Handle <ProcessException>()
.RetryForeverAsync(onRetry: ex =>
{
// executed before each retry
// https://github.com/hardkoded/puppeteer-sharp/issues/1509
// ex. PuppeteerSharp.ProcessException: Failed to launch Chromium! [0909/142354.872:FATAL:feature_list.cc(282)] Check failed: !g_initialized_from_accessor.
// Error: Backtrace:
// Error: ovly_debug_event [0x00007FFE262A1252+16183762]
// Error: ovly_debug_event [0x00007FFE262A0832+16181170]
// Error: ovly_debug_event [0x00007FFE262B3383+16257795]
// Error: ovly_debug_event [0x00007FFE262A3386+16192262]
// Error: ovly_debug_event [0x00007FFE25DF4B2E+11283118]
// Error: ovly_debug_event [0x00007FFE2621DB58+15645400]
// Error: ovly_debug_event [0x00007FFE2621DACD+15645261]
// Error: ovly_debug_event [0x00007FFE26248F28+15822504]
// Error: ovly_debug_event [0x00007FFE2621D35E+15643358]
// Error: ovly_debug_event [0x00007FFE262483E3+15819619]
// Error: ovly_debug_event [0x00007FFE262482BB+15819323]
// Error: ovly_debug_event [0x00007FFE262480F2+15818866]
// Error: ChromeMain [0x00007FFE253311B6+286]
// Error: Ordinal0 [0x00007FF65A33275F+10079]
// Error: Ordinal0 [0x00007FF65A33182D+6189]
// Error: GetHandleVerifier [0x00007FF65A43B7C2+697538]
// Error: BaseThreadInitThunk [0x00007FFE5B2D84D4+20]
// Error: RtlUserThreadStart [0x00007FFE5B95E871+33]
// ex. PuppeteerSharp.ProcessException: Failed to create connection ---> System.TimeoutException: Timeout of 30000 ms exceeded
logger.LogWarning(ex.ToString());
Thread.Sleep(1000);
})
.ExecuteAsync(async() =>
{
bool coverAdded = false;
using (Browser browser = await Puppeteer.LaunchAsync(launchOptions))
{
try
{
PdfPrinter pdfPrinter = new PdfPrinter(browser, logger);
// cover options
HtmlToPdfOptions htmlToPdfOptions = new HtmlToPdfOptions
{
StyleSheet = options.UserStyleSheet,
JavascriptDelayInMilliseconds = options.JavascriptDelayInMilliseconds,
Landscape = options.Landscape,
PaperFormat = options.PaperFormat,
Height = options.PageHeight,
Width = options.PageWidth,
PrintBackground = options.PrintBackground,
};
if (!string.IsNullOrEmpty(options.Cover) && (!coverAdded))
{
// print cover
string pdfFile = await pdfPrinter.PrintAsPdfAsync(
options.Cover,
htmlToPdfOptions,
null);
int numberOfPages = PdfDocument.CountNumberOfPages(pdfFile);
logger.LogDebug($"Cover file \"{options.Cover}\" contains number of PDF pages: {numberOfPages}.");
HtmlToPdfFile htmlToPdfFile = new HtmlToPdfFile
{
Input = options.Cover,
Index = 0,
PdfFilePath = pdfFile,
PrintHeaderAndFooter = false,
NumberOfPages = numberOfPages,
};
htmlToPdfFiles.Add(htmlToPdfFile);
coverAdded = true;
}
// page options
htmlToPdfOptions.MarginOptions = marginOptions;
// header
htmlToPdfOptions.HeaderTemplateBuilder.Left = options.HeaderLeft;
htmlToPdfOptions.HeaderTemplateBuilder.Center = options.HeaderCenter;
htmlToPdfOptions.HeaderTemplateBuilder.Right = options.HeaderRight;
string headerFontSize = options.HeaderFontSize.AppendUnits("px");
htmlToPdfOptions.HeaderTemplateBuilder.FontSize = headerFontSize;
htmlToPdfOptions.HeaderTemplateBuilder.FontName = options.HeaderFontName;
htmlToPdfOptions.HeaderTemplateBuilder.Html = options.HeaderHtml;
// footer
htmlToPdfOptions.FooterTemplateBuilder.Left = options.FooterLeft;
htmlToPdfOptions.FooterTemplateBuilder.Center = options.FooterCenter;
htmlToPdfOptions.FooterTemplateBuilder.Right = options.FooterRight;
string footerFontSize = options.FooterFontSize.AppendUnits("px");
htmlToPdfOptions.FooterTemplateBuilder.FontSize = footerFontSize;
htmlToPdfOptions.FooterTemplateBuilder.FontName = options.FooterFontName;
htmlToPdfOptions.FooterTemplateBuilder.Html = options.FooterHtml;
// global header/footer variables
// https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-printToPDF
Dictionary <string, string> variables = new Dictionary <string, string>
{
{ "page", "<span class=\"pageNumber\"></span>" },
{ "date", dtNow.ToString("d") }, // M/dd/yyyy
{ "title", "<span class=\"title\"></span>" },
{ "frompage", (options.PageOffset + 1).ToString() },
{ "isodate", dtNow.ToString("yyyy-MM-dd") }, // ISO 8601 extended format
{ "time", dtNow.ToString("h:mm:ss tt") }, // ex. 3:58:45 PM
{ "doctitle", title },
};
// count the number of PDF pages each HTML file will be printed as
var tasks = options.Inputs
.Where(x => htmlToPdfFiles.All(y => y.Input != x))
.Select(async input =>
{
// print as pdf
// insert an empty page to avoid unexpected margins on the first page, which would affect the page count
// https://stackoverflow.com/a/55480268/90287
// https://github.com/puppeteer/puppeteer/issues/2592
HtmlToPdfOptions tempHtmlToPdfOptions = htmlToPdfOptions.Copy();
tempHtmlToPdfOptions.PageOffset = 1;
string pdfFile = await pdfPrinter.PrintAsPdfAsync(
input,
tempHtmlToPdfOptions,
variables);
// count the number of pages
int numberOfPages = PdfDocument.CountNumberOfPages(pdfFile);
logger.LogDebug($"\"{input}\" contains number of PDF pages: {numberOfPages}.");
HtmlToPdfFile htmlToPdfFile = new HtmlToPdfFile
{
Input = input,
Index = options.Inputs.IndexOf(input),
PdfFilePath = pdfFile,
PrintHeaderAndFooter = true,
NumberOfPages = numberOfPages,
};
htmlToPdfFiles.Add(htmlToPdfFile);
});
await Task.WhenAll(tasks);
variables.Add("topage", htmlToPdfFiles.Sum(x => x.NumberOfPages).ToString());
// update models with title and headings
List <Task> updateTitleAndHeadingsTasks = new List <Task>();
foreach (HtmlToPdfFile htmlToPdfFile in htmlToPdfFiles)
{
updateTitleAndHeadingsTasks.Add(Task.Run(() =>
{
// set the title and headings
HtmlFileParser htmlFileParser = new HtmlFileParser(htmlToPdfFile.Input);
htmlToPdfFile.TitleAndHeadings = htmlFileParser.GetTitleAndHeadings(options.AddTableOfContents);
htmlToPdfFile.Title = htmlToPdfFile.TitleAndHeadings.First().Text;
}));
}
await Task.WhenAll(updateTitleAndHeadingsTasks);
// create table of contents
if (options.AddTableOfContents)
{
await PdfOutlineBuilder.BuildOutlineAsync(
coverAdded,
options.AddTableOfContents,
options.OutputDottedLinesInTableOfContents,
htmlToPdfFiles,
options.OutlineBuilder,
options.DefaultTableOfContentsStyleSheetBuilder,
pdfPrinter,
htmlToPdfOptions,
variables);
}
// update models and re-print HTML files to include headers/footers with page numbers
tasks = htmlToPdfFiles.Select(async htmlToPdfFile =>
{
if (string.IsNullOrEmpty(title) &&
(htmlToPdfFile.Index == 0))
{
// set the PDF title
title = htmlToPdfFile.Title;
variables["doctitle"] = title;
}
// sum the number of pages in previous documents to get the current page number offset
int currentPageNumber = htmlToPdfFiles
.Where(x => x.Index < htmlToPdfFile.Index)
.Sum(x => x.NumberOfPages) + 1;
if ((currentPageNumber + htmlToPdfFile.NumberOfPages) <= (options.PageOffset + 1))
{
logger.LogDebug($"Skipping printing {htmlToPdfFile.Input}");
htmlToPdfFile.Skip = true;
return;
}
// print as pdf with page number offset
htmlToPdfFile.OutputPdfFilePageNumber = currentPageNumber;
logger.LogDebug($"'{htmlToPdfFile.Input}' mapped to output PDF file page number {currentPageNumber}.");
htmlToPdfOptions.PageOffset = currentPageNumber - 1;
htmlToPdfOptions.PageNumberOffset = options.PageOffset;
htmlToPdfOptions.NumberOfPages = htmlToPdfFile.NumberOfPages;
// TODO: only print as PDF again if topage variable is actually used in the header/footer
if (htmlToPdfFile.PrintHeaderAndFooter)
{
// delete previously created PDF file
File.Delete(htmlToPdfFile.PdfFilePath);
// print as pdf
string pdfFile = await pdfPrinter.PrintAsPdfAsync(
htmlToPdfFile.Input,
htmlToPdfOptions,
variables);
htmlToPdfFile.PdfFilePath = pdfFile;
}
// parse PDF to get heading page numbers
PdfDocument.SetHeadingPageNumbers(htmlToPdfFile);
});
await Task.WhenAll(tasks);
}
finally
{
await browser.CloseAsync();
}
}
});
}
// merge pdf files
List <string> pdfFilesToMerge = htmlToPdfFiles
.Where(x => !x.Skip)
.OrderBy(x => x.OutputPdfFilePageNumber)
.Select(x => x.PdfFilePath)
.ToList();
if (!string.IsNullOrEmpty(outputFilePath))
{
byte[] mergedBytes = PdfMerger.Merge(pdfFilesToMerge);
File.WriteAllBytes(outputFilePath, mergedBytes);
try
{
// update external file links to internal document links
PdfDocument.UpdateLinks(outputFilePath, htmlToPdfFiles, logger);
}
catch (Exception ex)
{
throw new UpdatePdfLinksException(outputFilePath, htmlToPdfFiles, ex);
}
PdfDocument.SetTitle(outputFilePath, title);
}
// delete temporary PDF files
var deleteTempFileTasks = htmlToPdfFiles
.Where(x => !string.IsNullOrEmpty(x.PdfFilePath))
.Select(async input =>
{
await Task.Factory.StartNew(() =>
{
if (File.Exists(input.PdfFilePath))
{
File.Delete(input.PdfFilePath);
}
});
});
await Task.WhenAll(deleteTempFileTasks);
return(htmlToPdfFiles);
}
