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- CSP: ajout frame-src 'self' http://127.0.0.1:* (permet iframe PDF) - pdf_reader.py: extract_pdf_toc() — extrait les bookmarks/outline (pypdf + pymupdf) - main.py: inclut pdf_toc dans la réponse /api/file pour les PDF - viewer.js: sidebar TOC avec liens vers les pages (si bookmarks présents) - style.css: layout .pdf-body flex + .pdf-toc sidebar 240px
131 lines
4.4 KiB
Python
131 lines
4.4 KiB
Python
"""PDF text extraction for ObsiGate — pypdf backend, pymupdf optional fallback."""
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from __future__ import annotations
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import logging
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from pathlib import Path
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logger = logging.getLogger(__name__)
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PDF_READER: str = "pypdf"
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try:
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import fitz # pymupdf
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PDF_READER = "pymupdf"
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logger.info("PDF reader: pymupdf (high performance)")
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except ImportError:
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try:
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from pypdf import PdfReader # type: ignore
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logger.info("PDF reader: pypdf (pure Python)")
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except ImportError:
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PdfReader = None # type: ignore
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logger.warning("No PDF reader available — install pypdf or pymupdf")
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def extract_pdf_text(file_path: Path, max_chars: int = 100000) -> str:
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"""Extract text from a PDF file. Returns empty string on failure."""
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if PdfReader is None and PDF_READER == "pypdf":
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return ""
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try:
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if PDF_READER == "pymupdf":
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return _extract_pymupdf(file_path, max_chars)
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else:
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return _extract_pypdf(file_path, max_chars)
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except Exception as e:
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logger.warning("Failed to extract PDF text from %s: %s", file_path, e)
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return ""
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def extract_pdf_metadata(file_path: Path) -> dict:
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"""Extract metadata from a PDF file."""
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info = {"pages": 0, "title": "", "author": ""}
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try:
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if PDF_READER == "pymupdf":
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doc = fitz.open(str(file_path))
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info["pages"] = doc.page_count
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meta = doc.metadata or {}
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info["title"] = meta.get("title", "")
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info["author"] = meta.get("author", "")
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doc.close()
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else:
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reader = PdfReader(str(file_path))
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info["pages"] = len(reader.pages)
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meta = reader.metadata or {}
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if meta:
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info["title"] = str(meta.get("/Title", ""))
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info["author"] = str(meta.get("/Author", ""))
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except Exception as e:
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logger.warning("Failed to extract PDF metadata from %s: %s", file_path, e)
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return info
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def extract_pdf_toc(file_path: Path) -> list[dict]:
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"""Extract table of contents (bookmarks/outline) from a PDF file.
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Returns a list of {title, page, level} dicts, or empty list on failure.
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"""
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toc: list[dict] = []
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try:
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if PDF_READER == "pymupdf":
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doc = fitz.open(str(file_path))
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raw = doc.get_toc(simple=False)
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for item in raw:
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toc.append({
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"title": str(item[1]),
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"page": item[2],
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"level": item[0],
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})
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doc.close()
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elif PdfReader is not None:
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reader = PdfReader(str(file_path))
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outline = reader.outline
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if outline:
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def _flatten(items, level=1):
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for item in items:
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if isinstance(item, list):
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_flatten(item, level + 1)
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elif hasattr(item, 'title') and hasattr(item, 'page'):
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page_num = reader.get_page_number(item.page) + 1 if hasattr(item, 'page') and item.page else 1
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toc.append({
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"title": str(item.title),
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"page": page_num,
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"level": level,
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})
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_flatten(outline)
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except Exception as e:
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logger.warning("Failed to extract PDF TOC from %s: %s", file_path, e)
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return toc
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def _extract_pymupdf(file_path: Path, max_chars: int) -> str:
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doc = fitz.open(str(file_path))
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parts = []
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total = 0
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for page in doc:
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text = page.get_text()
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if text:
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if total + len(text) > max_chars:
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remaining = max_chars - total
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if remaining > 0:
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parts.append(text[:remaining])
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break
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parts.append(text)
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total += len(text)
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doc.close()
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return "\f".join(parts)
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def _extract_pypdf(file_path: Path, max_chars: int) -> str:
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reader = PdfReader(str(file_path))
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parts = []
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total = 0
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for page in reader.pages:
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text = page.extract_text() or ""
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if text:
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if total + len(text) > max_chars:
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remaining = max_chars - total
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if remaining > 0:
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parts.append(text[:remaining])
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break
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parts.append(text)
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total += len(text)
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return "\f".join(parts)
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