pdfcraft/crates/audit

pdfcraft-audit

Layer L4 (may use edit): verification tooling, the faux-redaction audit.

let findings: Vec<Finding> = audit_redactions(&doc)?;  // page, kind, rect, covered_text

It reports two kinds of finding:

• faux redaction: an opaque filled rectangle painted after text it overlaps, dark enough against the text's colour (WCAG contrast below 3) to hide it, while the text is still extractable underneath;
• unapplied mark: a Redact annotation that was marked but never applied.

A properly applied redaction removes the text, so it never flags. Page backgrounds, table shading and highlights don't either: they're painted before the text, or light against it.

Limits, by design and documented rather than hidden:

• only filled rectangles count as covers, drawn with re or as a single m/l subpath whose corners form an axis-aligned rectangle (not other paths, shadings or patterns), and a translucent one (/ca below 1) is not flagged;
• covers inside form XObjects are found, but only text drawn directly in the page content is checked under them;
• annotation rectangles are compared in unrotated user space, so /Rotate pages may misalign.

It fails closed: an undecodable content stream, malformed /Annots, form XObjects nested deeper than 32 or in a cycle, or a walk past the operator bound is an error, never "no findings".

Surfaces: the redact_audit automation tool and pdfcraft-cli.