Wire veraPDF into axa_pdf_accessibility for PAC-equivalent PDF/UA-1 validation
AXA's accessibility QC team uses axes4 PAC (PDF/UA-1 / Matterhorn Protocol) as their compliance gate, but our existing 9-criterion deterministic check runs surface-level only and would pass documents PAC fails. Wired up the existing _run_verapdf() stub so veraPDF — the open-source Matterhorn implementation — runs as a subprocess and drives the score when available. Verified locally: veraPDF on EAA_v1.pdf reports the exact same Content (86) and Metadata (1) failure counts as PAC's report on the same document family, confirming protocol parity. Falls back cleanly to the deterministic layer when veraPDF isn't installed, so deploys are safe before the binary lands on dev/prod servers. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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nickviljoen
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3 changed files with 272 additions and 51 deletions
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@ -20,7 +20,7 @@ Multi-page policy document QC. `mode: document`, scopes vary per check.
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| `axa_phone_inventory` | Extracts phone numbers across pages, validates format and approved-list membership | 1.0 |
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| `axa_bold_words_definitions` | Bold-word inventory + definition cross-check (seed list at `backend/document_mode/data/axa_bold_words_seed.json`) | 2.0 |
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| `axa_page_numbering` | Page numbering format and continuity | 1.0 |
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| `axa_pdf_accessibility` | Tagged-PDF / accessibility checks | 2.0 |
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| `axa_pdf_accessibility` | PDF/UA-1 validation via veraPDF (matches axes4 PAC), with deterministic PyMuPDF fallback if veraPDF is not installed | 2.0 |
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| `axa_print_preflight` | Print-preflight checks (color space, embedded fonts, image resolution) | 1.0 |
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| `axa_print_code` | Print code presence + format | 1.0 |
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| `axa_omg_versioning` | OMG version footer/header presence and consistency | 1.0 |
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@ -50,6 +50,17 @@ Boots Production Pack reuses this entire spine — so any infra changes here aff
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- Phase 2 (any further check expansion) deferred until after show-and-tell
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- Canonical AXA font list / approved phone list / OMG version reference data may need expansion as test PDFs surface gaps
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## veraPDF deployment
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`axa_pdf_accessibility` runs the **veraPDF** PDF/UA-1 validator as a subprocess when the binary is available. veraPDF implements the Matterhorn Protocol — the same rule set axes4 PAC uses — so its verdict is the closest open-source equivalent to PAC.
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Binary resolution order (in `accessibility_checks._resolve_verapdf_binary`):
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1. `VERAPDF_BIN` env var
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2. `verapdf` on PATH
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3. `/opt/ai_qc/vendor/verapdf/verapdf` (project-local production install)
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If veraPDF isn't installed the check falls back to the 9-criterion deterministic PyMuPDF layer — no breakage, just less depth. **Production install pattern** is a project-local bundled-JRE tarball under `/opt/ai_qc/vendor/verapdf/` to avoid touching system Java or other projects on shared servers.
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## Key files
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- `backend/AXA_DOCUMENT_MODE_PLAN.md` — full design plan and phase breakdown
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@ -1,35 +1,46 @@
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"""PDF accessibility checks aligned to PDF/UA-1 + WCAG-AAA-relevant subset.
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"""PDF accessibility checks aligned to PDF/UA-1.
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Deterministic Python implementation using PyMuPDF — no Java/veraPDF needed
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to ship Phase 4. Once veraPDF is installed on the host, _run_verapdf() can
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be wired in as an additional validation layer (see __doc__ for that fn).
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Two layers, applied in order:
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1. veraPDF subprocess — full PDF/UA-1 (ISO 14289-1) validation via the
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Matterhorn Protocol. This is the same protocol PAC uses, so its
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verdict is the authoritative one when veraPDF is available on the
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host. When it runs, its result drives the score and pass flag.
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2. Deterministic PyMuPDF criteria (C1-C9) — fast surface checks that
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run regardless. They give the AXA team a quick visual sanity-pass
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(tagged? language set? fonts embedded?) and are the sole source of
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truth when veraPDF is not installed.
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Criteria checked (subset of the 30+ rules in PDF/UA-1 §7):
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Deterministic criteria:
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• C1 Tagged PDF — document has a /StructTreeRoot
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• C2 Marked — /MarkInfo /Marked is true
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• C3 Title — metadata /Title set and non-empty
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• C4 Language — document /Lang specified
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• C5 No password protection — /Encrypt absent or accessibility-friendly
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• C6 Fonts embedded — every font flagged as embedded
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• C7 PDF version — 1.5+ recommended (older versions can't carry full
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accessibility tagging features)
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• C7 PDF version — 1.5+ recommended
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• C8 XMP UA-conformance — XMP metadata declares pdfuaid:part
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• C9 Image alt text — sampled images have /Alt or /ActualText in the
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structure tree (heuristic: looks for /Alt anywhere in the catalog
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graph; not a full structure-tree walk).
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Each criterion gets a pass/fail and a short observation. The check's
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overall score = (passing_criteria / total_criteria) * 10.
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• C9 Image alt text — sampled images have /Alt or /ActualText
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"""
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from __future__ import annotations
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import os
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import re
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import shutil
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import subprocess
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import xml.etree.ElementTree as ET
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from typing import Dict, List, Optional
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import fitz # PyMuPDF
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# Project-local install path for the production server (see vendor dir
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# under /opt/ai_qc/vendor/verapdf/). Falls back to PATH lookup or
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# VERAPDF_BIN env var.
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_VERAPDF_VENDOR_PATH = '/opt/ai_qc/vendor/verapdf/verapdf'
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_VERAPDF_TIMEOUT_SECONDS = 180
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# ─────────────────────────────────────────────────────────────────────────────
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# Helpers
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# ─────────────────────────────────────────────────────────────────────────────
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@ -237,10 +248,11 @@ def _check_alt_text_sampling(doc: fitz.Document) -> Dict:
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def axa_pdf_accessibility(ingest_result: Dict, scope_args: Optional[Dict] = None) -> Dict:
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"""Run the full PDF/UA-aligned check set on the ingested PDF.
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"""Run PDF/UA-1 accessibility validation on the ingested PDF.
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Requires `pdf_path` on ingest_result (set by the dispatcher). Falls
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back to a structured-error result if PDF can't be opened.
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When veraPDF is installed on the host, its PDF/UA-1 verdict is the
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authoritative score driver. The deterministic PyMuPDF criteria run
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in either case as a quick sanity layer.
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"""
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pdf_path = ingest_result.get('pdf_path')
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if not pdf_path:
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@ -282,22 +294,24 @@ def axa_pdf_accessibility(ingest_result: Dict, scope_args: Optional[Dict] = None
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finally:
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doc.close()
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passed = [c for c in criteria if c['passed']]
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failed = [c for c in criteria if not c['passed']]
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total = len(criteria)
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score = round((len(passed) / total) * 10, 2) if total else 0.0
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pass_flag = len(failed) == 0
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crit_passed = [c for c in criteria if c['passed']]
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crit_failed = [c for c in criteria if not c['passed']]
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crit_total = len(criteria)
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if pass_flag:
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summary = f'All {total} accessibility criteria passed.'
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verapdf = _run_verapdf(pdf_path)
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verapdf_ok = bool(verapdf and verapdf.get('available') and not verapdf.get('error'))
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if verapdf_ok:
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score, pass_flag, summary = _score_from_verapdf(verapdf)
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else:
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summary = f'{len(failed)} of {total} accessibility criteria failed.'
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score = round((len(crit_passed) / crit_total) * 10, 2) if crit_total else 0.0
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pass_flag = len(crit_failed) == 0
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if pass_flag:
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summary = f'All {crit_total} fast accessibility criteria passed (veraPDF unavailable — install for full PDF/UA-1 validation).'
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else:
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summary = f'{len(crit_failed)} of {crit_total} fast accessibility criteria failed (veraPDF unavailable).'
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response_lines = [summary, '']
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for c in criteria:
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marker = '✓' if c['passed'] else '✗'
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response_lines.append(f" {marker} {c['code']} — {c['title']}: {c['note']}")
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response = '\n'.join(response_lines)
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response = _build_response_text(summary, criteria, verapdf if verapdf_ok else None)
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return {
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'check_name': 'axa_pdf_accessibility',
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@ -307,32 +321,182 @@ def axa_pdf_accessibility(ingest_result: Dict, scope_args: Optional[Dict] = None
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'summary': summary,
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'findings': {
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'criteria': criteria,
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'criteria_total': total,
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'criteria_passed': len(passed),
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'criteria_failed': len(failed),
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'verapdf_run': False, # set to True when veraPDF subprocess is wired in
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'criteria_total': crit_total,
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'criteria_passed': len(crit_passed),
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'criteria_failed': len(crit_failed),
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'verapdf_run': verapdf_ok,
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'verapdf': verapdf if verapdf else None,
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},
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'response': response,
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}
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def _score_from_verapdf(verapdf: Dict) -> tuple:
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"""Map veraPDF UA-1 verdict to (score, pass_flag, summary).
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Severity ladder: any rule failure means the document is not PDF/UA-1,
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so pass_flag is False whenever veraPDF marks the file non-compliant.
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Score grades the depth of failure so partially-compliant documents
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still produce a meaningful number for trend tracking.
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"""
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if verapdf.get('compliant'):
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n_rules = verapdf.get('passed_rules', 0)
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return 10.0, True, f'PDF/UA-1 compliant per veraPDF ({n_rules} rules passed).'
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n_failed = verapdf.get('failed_rules', 0)
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n_failed_checks = verapdf.get('failed_checks', 0)
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if n_failed <= 1:
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score = 5.0
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elif n_failed == 2:
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score = 3.0
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else:
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score = 0.0
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summary = (
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f'PDF/UA-1 non-compliant per veraPDF: {n_failed} rule(s) failed '
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f'across {n_failed_checks} individual check(s).'
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)
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return score, False, summary
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def _build_response_text(summary: str, criteria: List[Dict], verapdf: Optional[Dict]) -> str:
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"""Plain-text response shown in the QC report's response block."""
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lines = [summary, '']
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if verapdf:
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lines.append('── veraPDF PDF/UA-1 ──')
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verdict = 'COMPLIANT' if verapdf.get('compliant') else 'NOT COMPLIANT'
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lines.append(f' Verdict: {verdict}')
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lines.append(
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f' Rules: {verapdf.get("passed_rules", 0)} passed / '
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f'{verapdf.get("failed_rules", 0)} failed'
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)
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lines.append(
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f' Checks: {verapdf.get("passed_checks", 0)} passed / '
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f'{verapdf.get("failed_checks", 0)} failed'
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)
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for r in verapdf.get('failed_rule_details', []):
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tag_str = ', '.join(r.get('tags') or []) or '—'
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lines.append('')
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lines.append(
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f' ✗ Clause {r["clause"]}-{r["test_number"]} '
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f'(×{r["failed_checks"]}, {tag_str})'
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)
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lines.append(f' {r["description"]}')
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for s in r.get('sample_errors', [])[:1]:
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lines.append(f' e.g. {s}')
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lines.append('')
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lines.append('── Fast deterministic criteria ──')
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for c in criteria:
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marker = '✓' if c['passed'] else '✗'
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lines.append(f" {marker} {c['code']} — {c['title']}: {c['note']}")
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return '\n'.join(lines)
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# ─────────────────────────────────────────────────────────────────────────────
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# veraPDF integration stub — wire when Java is on the host
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# veraPDF integration
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# ─────────────────────────────────────────────────────────────────────────────
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def _resolve_verapdf_binary() -> Optional[str]:
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"""Locate the veraPDF executable. Order: VERAPDF_BIN env > PATH >
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project-local vendor install. Returns None if veraPDF is not
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installed; the check then falls back to deterministic-only mode.
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"""
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env_path = os.environ.get('VERAPDF_BIN')
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if env_path and os.path.isfile(env_path) and os.access(env_path, os.X_OK):
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return env_path
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path_lookup = shutil.which('verapdf')
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if path_lookup:
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return path_lookup
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if os.path.isfile(_VERAPDF_VENDOR_PATH) and os.access(_VERAPDF_VENDOR_PATH, os.X_OK):
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return _VERAPDF_VENDOR_PATH
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return None
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def _run_verapdf(pdf_path: str) -> Optional[Dict]:
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"""Stub for veraPDF subprocess validation.
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To enable:
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1. Install veraPDF on the host: https://verapdf.org/software/
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(requires JRE 8+; ~150MB total).
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2. Ensure `verapdf` binary is on PATH or set VERAPDF_BIN env var.
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3. Replace this stub with subprocess.run([verapdf, '--format', 'json',
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'--profile', 'ua1', pdf_path], capture_output=True). Parse the
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JSON output and merge into axa_pdf_accessibility's findings.
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4. Set findings['verapdf_run'] = True so the report shows it ran.
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Currently returns None so callers know veraPDF was not invoked.
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"""Run veraPDF PDF/UA-1 validation. Returns a structured result dict
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or None when veraPDF is not installed. Returns a dict with 'error'
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populated if the subprocess ran but failed in some recoverable way.
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"""
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return None
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binary = _resolve_verapdf_binary()
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if not binary:
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return None
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try:
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result = subprocess.run(
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[binary, '-f', 'ua1', '--format', 'xml', '--maxfailuresdisplayed', '3', pdf_path],
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capture_output=True,
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text=True,
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timeout=_VERAPDF_TIMEOUT_SECONDS,
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)
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except subprocess.TimeoutExpired:
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return {'available': True, 'binary': binary, 'error': f'veraPDF timed out after {_VERAPDF_TIMEOUT_SECONDS}s'}
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except Exception as e:
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return {'available': True, 'binary': binary, 'error': f'veraPDF subprocess failed: {e}'}
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if not result.stdout:
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return {
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'available': True,
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'binary': binary,
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'error': 'veraPDF produced no output',
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'stderr': (result.stderr or '')[:500],
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}
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try:
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root = ET.fromstring(result.stdout)
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except ET.ParseError as e:
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return {
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'available': True,
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'binary': binary,
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'error': f'Could not parse veraPDF XML: {e}',
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}
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vr = root.find('.//validationReport')
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if vr is None:
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return {
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'available': True,
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'binary': binary,
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'error': 'No validationReport in veraPDF output',
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}
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details = vr.find('details')
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rules: List[Dict] = []
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if details is not None:
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for rule in details.findall('rule'):
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tags = (rule.get('tags') or '').split(',')
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tags = [t for t in tags if t]
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rules.append({
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'specification': rule.get('specification'),
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'clause': rule.get('clause'),
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'test_number': rule.get('testNumber'),
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'tags': tags,
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'failed_checks': int(rule.get('failedChecks') or 0),
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'description': (rule.findtext('description') or '').strip(),
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'sample_errors': [
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(c.findtext('errorMessage') or '').strip()
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for c in rule.findall('check')[:2]
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],
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})
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def _detail_int(name: str) -> int:
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if details is None:
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return 0
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try:
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return int(details.get(name) or 0)
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except (TypeError, ValueError):
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return 0
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return {
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'available': True,
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'binary': binary,
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'compliant': vr.get('isCompliant') == 'true',
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'profile': vr.get('profileName', 'PDF/UA-1'),
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'statement': vr.get('statement', ''),
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'passed_rules': _detail_int('passedRules'),
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'failed_rules': _detail_int('failedRules'),
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'passed_checks': _detail_int('passedChecks'),
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'failed_checks': _detail_int('failedChecks'),
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'failed_rule_details': rules,
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}
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@ -235,14 +235,60 @@ def _render_pdf_accessibility(findings: Dict) -> str:
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passed = findings.get('criteria_passed', 0)
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total = findings.get('criteria_total', 0)
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verapdf_run = findings.get('verapdf_run', False)
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verapdf = findings.get('verapdf') or {}
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if verapdf_run:
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verapdf_label = '<span class="ok">enabled</span>'
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elif verapdf.get('error'):
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verapdf_label = f'<span class="bad">error: {html.escape(verapdf["error"])}</span>'
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else:
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verapdf_label = '<span class="muted">not installed on host</span>'
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head = f"""
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<p>
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<strong>{passed} / {total}</strong> PDF/UA-aligned criteria passed
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· veraPDF: {'<span class="ok">enabled</span>' if verapdf_run else '<span class="muted">not run (Java not installed)</span>'}
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<strong>{passed} / {total}</strong> fast criteria passed
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· veraPDF PDF/UA-1: {verapdf_label}
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</p>
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"""
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verapdf_block = ''
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if verapdf_run:
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compliant = verapdf.get('compliant')
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verdict_html = (
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"<span class='ok'>COMPLIANT</span>" if compliant
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else "<span class='bad'>NOT COMPLIANT</span>"
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)
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rule_rows = []
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for r in verapdf.get('failed_rule_details') or []:
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tags = ', '.join(r.get('tags') or []) or '—'
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samples = r.get('sample_errors') or []
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sample_html = ''
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if samples:
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sample_html = (
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"<br><code>e.g. " + html.escape(samples[0]) + "</code>"
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)
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rule_rows.append(f"""
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<tr>
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<td><code>{html.escape(str(r.get('clause', '')))}-{html.escape(str(r.get('test_number', '')))}</code></td>
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<td class='center'>{r.get('failed_checks', 0)}</td>
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<td><code>{html.escape(tags)}</code></td>
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<td>{html.escape(r.get('description', ''))}{sample_html}</td>
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</tr>
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""")
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verapdf_block = f"""
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<p><strong>veraPDF verdict:</strong> {verdict_html} ·
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{verapdf.get('passed_rules', 0)} rules passed / {verapdf.get('failed_rules', 0)} failed ·
|
||||
{verapdf.get('passed_checks', 0)} checks passed / {verapdf.get('failed_checks', 0)} failed</p>
|
||||
"""
|
||||
if rule_rows:
|
||||
verapdf_block += f"""
|
||||
<table class='findings-table'>
|
||||
<thead><tr><th>Clause</th><th>Failures</th><th>Tags</th><th>Description</th></tr></thead>
|
||||
<tbody>{''.join(rule_rows)}</tbody>
|
||||
</table>
|
||||
"""
|
||||
|
||||
rows = []
|
||||
for c in criteria:
|
||||
marker = '<span class="ok">✓</span>' if c['passed'] else '<span class="bad">✗</span>'
|
||||
|
|
@ -261,7 +307,7 @@ def _render_pdf_accessibility(findings: Dict) -> str:
|
|||
</tr>
|
||||
""")
|
||||
|
||||
return head + f"""
|
||||
return head + verapdf_block + f"""
|
||||
<table class='findings-table'>
|
||||
<thead><tr><th></th><th>Code</th><th>Criterion</th><th>Observation</th></tr></thead>
|
||||
<tbody>{''.join(rows)}</tbody>
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue