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feat: document-sanitization EPDF_* exports (XMP, thumbnails, JavaScript) #27

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59 changes: 59 additions & 0 deletions fpdfsdk/fpdf_doc.cpp
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -773,4 +773,63 @@ EPDF_GetMetaKeyName(FPDF_DOCUMENT document,
}
}
return 0;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
EPDF_RemoveXMPMetadata(FPDF_DOCUMENT document) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return false;

RetainPtr<CPDF_Dictionary> root = pDoc->GetMutableRoot();
if (!root)
return false;

// /Metadata is the catalog-level XMP stream (ISO 32000 §14.3.2). It is stored
// separately from /Info, so clearing Info via EPDF_SetMetaText() does not
// touch it. Removing the key drops the XMP from the document.
root->RemoveFor("Metadata");
return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
EPDF_RemoveEmbeddedThumbnails(FPDF_DOCUMENT document) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return false;

const int count = pDoc->GetPageCount();
for (int i = 0; i < count; ++i) {
RetainPtr<CPDF_Dictionary> page = pDoc->GetMutablePageDictionary(i);
if (page)
page->RemoveFor("Thumb");
}
return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
EPDF_RemoveAllJavaScript(FPDF_DOCUMENT document) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return false;

RetainPtr<CPDF_Dictionary> root = pDoc->GetMutableRoot();
if (!root)
return false;

// (1) Catalog /Names /JavaScript name tree (document-level scripts).
RetainPtr<CPDF_Dictionary> names = root->GetMutableDictFor("Names");
if (names)
names->RemoveFor("JavaScript");

// (2) /OpenAction, but only when it is a JavaScript action — a GoTo
// destination OpenAction is legitimate navigation and is left intact.
RetainPtr<const CPDF_Dictionary> open_action = root->GetDictFor("OpenAction");
if (open_action && open_action->GetNameFor("S") == "JavaScript")
root->RemoveFor("OpenAction");

// (3) Catalog-level /AA additional-actions (e.g. WillClose/WillPrint scripts).
root->RemoveFor("AA");

return true;
}
34 changes: 34 additions & 0 deletions public/fpdf_doc.h
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -517,6 +517,40 @@ EPDF_GetMetaKeyName(FPDF_DOCUMENT document,
void* buffer,
unsigned long buflen);

// Experimental EmbedPDF Extension API.
// Remove the document's XMP metadata stream (the catalog /Metadata entry).
//
// document - handle to the document.
//
// XMP metadata (ISO 32000 §14.3.2) is stored separately from the Info
// dictionary, so clearing Info via EPDF_SetMetaText() does not remove it. This
// is the #1 redaction-sanitization miss: author/title/history can survive in
// XMP. Returns true on success, including when no /Metadata is present.
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
EPDF_RemoveXMPMetadata(FPDF_DOCUMENT document);

// Experimental EmbedPDF Extension API.
// Remove every page's embedded thumbnail (the page /Thumb entry).
//
// document - handle to the document.
//
// An embedded thumbnail can retain a pre-redaction image of the page. Returns
// true on success, including when no thumbnails are present.
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
EPDF_RemoveEmbeddedThumbnails(FPDF_DOCUMENT document);

// Experimental EmbedPDF Extension API.
// Remove all document-level JavaScript from |document|: the catalog
// /Names /JavaScript name tree, /OpenAction when it is a JavaScript action
// (GoTo destinations are preserved), and the catalog /AA additional-actions
// dictionary.
//
// document - handle to the document.
//
// Returns true on success, including when no JavaScript is present.
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
EPDF_RemoveAllJavaScript(FPDF_DOCUMENT document);

// Experimental EmbedPDF Extension API.
// Create a new destination array of the form [page /XYZ left top zoom].
//
Expand Down

AltStyle によって変換されたページ (->オリジナル) /