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Refactor PDFium download and extraction logic

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This commit is contained in:
Thorsten Sommer 2026-06-11 12:19:07 +02:00
parent 2c10718da5
commit e24449fc57
Signed by untrusted user who does not match committer: tsommer
GPG Key ID: 371BBA77A02C0108
1 changed files with 54 additions and 50 deletions
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98
app/Build/Commands/Pdfium.cs
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@ -28,65 +28,69 @@ public static class Pdfium
return; return;
} }
//
// Download the file:
//
var pdfiumTmpDownloadPath = Path.GetTempFileName();
var pdfiumTmpExtractPath = Directory.CreateTempSubdirectory();
Console.Write(" downloading ...");
using (var client = new HttpClient())
{
var response = await client.GetAsync(pdfiumUrl);
if (!response.IsSuccessStatusCode)
{
Console.WriteLine($" failed to download Pdfium {version} for {rid.ToUserFriendlyName()} from {pdfiumUrl}");
return;
}
await using var fileStream = File.Create(pdfiumTmpDownloadPath);
await response.Content.CopyToAsync(fileStream);
}
//
// Extract the downloaded file:
//
Console.Write(" extracting ...");
await using(var tgzStream = File.Open(pdfiumTmpDownloadPath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
await using var uncompressedStream = new GZipStream(tgzStream, CompressionMode.Decompress);
await TarFile.ExtractToDirectoryAsync(uncompressedStream, pdfiumTmpExtractPath.FullName, true);
}
//
// Copy the library to the target directory:
//
Console.Write(" deploying ...");
if (string.IsNullOrWhiteSpace(library.Path)) if (string.IsNullOrWhiteSpace(library.Path))
{ {
Console.WriteLine($" failed to find the library path for {rid.ToUserFriendlyName()}"); Console.WriteLine($" failed to find the library path for {rid.ToUserFriendlyName()}");
return; return;
} }
var pdfiumLibSourcePath = Path.Join(pdfiumTmpExtractPath.FullName, library.Path); var pdfiumLibTargetDirectory = Path.Join(cwd, "resources", "libraries");
if (!File.Exists(pdfiumLibSourcePath)) var pdfiumLibTmpTargetPath = Path.Join(pdfiumLibTargetDirectory, $"{library.Filename}.{Guid.NewGuid():N}.tmp");
var pdfiumLibArchivePath = library.Path.Replace('\\', '/');
//
// Download the file:
//
Console.Write(" downloading ...");
using var client = new HttpClient();
using var response = await client.GetAsync(pdfiumUrl, HttpCompletionOption.ResponseHeadersRead);
if (!response.IsSuccessStatusCode)
{ {
Console.WriteLine($" failed to find the library file '{pdfiumLibSourcePath}'"); Console.WriteLine($" failed to download Pdfium {version} for {rid.ToUserFriendlyName()} from {pdfiumUrl}");
return; return;
} }
Directory.CreateDirectory(Path.Join(cwd, "resources", "libraries"));
if (File.Exists(pdfiumLibTargetPath))
File.Delete(pdfiumLibTargetPath);
File.Copy(pdfiumLibSourcePath, pdfiumLibTargetPath);
// //
// Cleanup: // Extract the library from the downloaded file:
// //
Console.Write(" cleaning up ..."); Console.Write(" extracting ...");
File.Delete(pdfiumTmpDownloadPath); Directory.CreateDirectory(pdfiumLibTargetDirectory);
Directory.Delete(pdfiumTmpExtractPath.FullName, true);
var foundLibrary = false;
try
{
await using var downloadStream = await response.Content.ReadAsStreamAsync();
await using var uncompressedStream = new GZipStream(downloadStream, CompressionMode.Decompress);
await using var tarReader = new TarReader(uncompressedStream, false);
while (await tarReader.GetNextEntryAsync(false) is { } entry)
{
if (!string.Equals(entry.Name.Replace('\\', '/'), pdfiumLibArchivePath, StringComparison.Ordinal))
continue;
if (entry.DataStream == null)
break;
await using var fileStream = File.Create(pdfiumLibTmpTargetPath);
await entry.DataStream.CopyToAsync(fileStream);
foundLibrary = true;
break;
}
if (!foundLibrary)
{
Console.WriteLine($" failed to find the library file '{pdfiumLibArchivePath}' in the Pdfium archive");
return;
}
Console.Write(" deploying ...");
File.Move(pdfiumLibTmpTargetPath, pdfiumLibTargetPath, true);
}
finally
{
if (File.Exists(pdfiumLibTmpTargetPath))
File.Delete(pdfiumLibTmpTargetPath);
}
Console.WriteLine(" done."); Console.WriteLine(" done.");
} }