PDFlibPas: compliance and signing workbench in Delphi

losLab PDF Library, Delphi ve C++Builder ekiplerine masaüstü, sunucu, DLL, ActiveX ve Dylib iş akışları için kaynak kodlu bir PDF motoru sağlar; dahili PDF/A ve PDF/UA kontrolleri, PAdES imzalama ve belgeleri harici PDF servisine göndermeden renderer seçimi sunar.

Bu yazı teams combining validation, remediation, signature preparation, and evidence review in one Delphi workflow için hazırlanmıştır. compliance and signing workbench konusunu tek bir bileşen çağrısı olarak değil, üretim düzeyinde belge mühendisliği olarak ele alır.

Pratik risk şudur: separate validation and signing tools can disagree about the document state, leaving operators unsure which revision was checked and which revision was signed. Bu nedenle akışın yazılı sözleşmeye, gözlemlenebilir tanılara ve gerçekçi regresyon dosyalarına ihtiyacı vardır.

Mimari kararlar

Use one workbench record for the document lifecycle. validation profiles required before signing and after signing / remediation actions allowed inside the workbench versus upstream templates

validation profiles required before signing and after signing
remediation actions allowed inside the workbench versus upstream templates
certificate source, timestamp authority, revocation source, and operator roles
waiver workflow for compliance warnings that do not block signing

Uygulama akışı

Validate before the signing revision is created. Aşağıdaki sıra, iş akışını Delphi ve C++Builder ekipleri için incelenebilir tutar.

create a workbench record and hash the source file before analysis
run compliance validation and classify findings into fix, waive, or block
apply approved remediation before the signature field is reserved
sign the validated revision and immediately run post-sign validation
package reports, hashes, certificate data, and operator decisions together

Doğrulama kanıtı

Workbench evidence that survives audit. Bu alanları çıktı veya destek kaydıyla birlikte saklayın.

source hash, validation profile, issue summary, remediation list, and waiver list
certificate fingerprint, timestamp result, revocation status, and signer identity
pre-sign and post-sign validation reports with matching document references
final file hash and workbench decision trail

Validation and signing must agree on bytes

A compliance and signing workbench should tie the input hash, validation profile, remediation decisions, signing certificate, timestamp, and final validation result together. Without that chain, a signed file can be difficult to explain later.

Operational metrics to watch

The first release should expose enough metrics to prove the workflow is healthy under real files, not only under curated samples.

count and rate for source hash, validation profile, issue summary, remediation list, and waiver list
warning trend for fixing compliance issues after signing changes the revision that was trusted
latency of the stage that must create a workbench record and hash the source file before analysis
profile usage for validation profiles required before signing and after signing

Mühendislik inceleme notları: compliance and signing workbench

Özelliğin bir demoyu aşıp sürüm, destek ve müşteri eskalasyonu sırasında savunulabilir olduğunu doğrulamak için bu inceleme notlarını kullanın.

Karar: validation profiles required before signing and after signing. Uygulama baskı noktası: run compliance validation and classify findings into fix, waive, or block. Kabul kanıtı: pre-sign and post-sign validation reports with matching document references. Regresyon tetikleyicisi: operators need a clear blocked state when the source cannot be trusted
Karar: remediation actions allowed inside the workbench versus upstream templates. Uygulama baskı noktası: apply approved remediation before the signature field is reserved. Kabul kanıtı: final file hash and workbench decision trail. Regresyon tetikleyicisi: fixing compliance issues after signing changes the revision that was trusted
Karar: certificate source, timestamp authority, revocation source, and operator roles. Uygulama baskı noktası: sign the validated revision and immediately run post-sign validation. Kabul kanıtı: source hash, validation profile, issue summary, remediation list, and waiver list. Regresyon tetikleyicisi: waivers should identify an owner and expiry rather than becoming permanent silence
Karar: waiver workflow for compliance warnings that do not block signing. Uygulama baskı noktası: package reports, hashes, certificate data, and operator decisions together. Kabul kanıtı: certificate fingerprint, timestamp result, revocation status, and signer identity. Regresyon tetikleyicisi: timestamp services and validators may fail independently of PDF generation

Sınır durumları

fixing compliance issues after signing changes the revision that was trusted
waivers should identify an owner and expiry rather than becoming permanent silence
timestamp services and validators may fail independently of PDF generation
operators need a clear blocked state when the source cannot be trusted

Delphi / C++Builder notes

PDFlibPas should sit behind a small service boundary that receives files, streams, profiles, and credentials, then returns output paths, warnings, metrics, and validation status. Important terms include compliance, PAdES, preflight, timestamp, waiver, validation report.

Delphi kod örneği

Aşağıdaki Delphi taslağı bu konu için pratik bir servis sınırını gösterir. Politika kontrollerini, günlüklemeyi ve doğrulamayı dar ürün çağrısı bölümünün dışında tutarak akışı test edilebilir bırakın.

procedure RunComplianceSigningJob(const InputFile, OutputFile: string; const Policy: TSigningPolicy);
var
  Pdf: TPDFlib;
begin
  Pdf := TPDFlib.Create;
  try
    Pdf.LoadFromFile(InputFile, Policy.OpenPassword);
    PrepareComplianceEvidence(Pdf, Policy);
    CompleteSigningWorkflow(Pdf, OutputFile, Policy);
    ValidateSignedOutput(OutputFile, Policy.ProfileName);
  finally
    Pdf.Free;
  end;
end;

Üretim kontrol listesi

İş akışını boş bir dosyada, normal bir müşteri dosyasında ve en kötü durum dosyasında çalıştırın
Oluşturulan PDF'yi hedef görüntüleyici, doğrulayıcı, yazıcı veya aşağı akış uygulamasıyla açın
Ürün sürümünü, profil sürümünü, giriş karmasını, çıktı yolunu, geçen süreyi ve uyarı sayısını kaydedin
Parolaları, sertifikaları, geçici dosyaları ve müşteri verilerini açık saklama kuralları altında tutun
Bir müşteri dosyası yeni bir uç durum ortaya çıkardığında regresyon belgeleri ekleyin

Ürün belgeleri

PDFlibPas

Ek kod örnekleri

ProcessID := PDF.NewSignProcessFromFile('invoice-fixed.pdf', '');
if ProcessID = 0 then
  raise Exception.Create('Cannot open source for signing');
PDF.SetSignProcessField(ProcessID, 'ApprovalSig');
PDF.SetSignProcessPFXFromFile(ProcessID, 'company.pfx', PfxPassword);
PDF.SetSignProcessInfo(ProcessID, 'Invoice approval', 'Berlin', 'billing@example.com');
PDF.SetSignProcessCustomSubFilter(ProcessID, 'ETSI.CAdES.detached');  // PAdES baseline
PDF.SetSignProcessDigestAlgorithm(ProcessID, 2);                      // SHA-256
PDF.SetSignProcessReserveContentsBytes(ProcessID, 8192);              // room for a later timestamp
PDF.EndSignProcessToFile(ProcessID, 'invoice-signed.pdf');
if PDF.GetSignProcessResult(ProcessID) <> 1 then
  Writeln('Sign failed, code ', PDF.GetSignProcessResult(ProcessID));
PDF.ReleaseSignProcess(ProcessID);

var
  Doc: TPDFlibSignDoc;
  Names: TStringList;
  FS: TFileStream;
  I: Integer;
  SourceSize, RangeStart, GapStart, TailStart, TailLen: Int64;
begin
  // Capture the size before Open: the audit object holds a share lock on the file
  FS := TFileStream.Create('invoice-signed.pdf', fmOpenRead or fmShareDenyNone);
  SourceSize := FS.Size;
  FS.Free;
  Doc := TPDFlibSignDoc.Create;
  Names := TStringList.Create;
  try
    if not Doc.Open('invoice-signed.pdf', '', False) then Exit;
    Doc.GetSignatureFieldNames(Names);
    for I := 0 to Names.Count - 1 do
      if Doc.GetSignatureValueObjNum(Names[I]) > 0 then  // > 0 means the field is signed
      begin
        RangeStart := StrToInt64(string(Doc.GetSignatureValueByName(Names[I], 11)));
        GapStart   := StrToInt64(string(Doc.GetSignatureValueByName(Names[I], 12)));
        TailStart  := StrToInt64(string(Doc.GetSignatureValueByName(Names[I], 13)));
        TailLen    := StrToInt64(string(Doc.GetSignatureValueByName(Names[I], 14)));
        if (RangeStart = 0) and (TailStart + TailLen = SourceSize) then
          Writeln(Names[I], ': signature covers the file to EOF')
        else
          Writeln(Names[I], ': earlier revision, or unusual ByteRange layout');
      end;
    Doc.Close;
  finally
    Names.Free;
    Doc.Free;
  end;
end;