feat: implement core dual-track processing infrastructure
Added foundation for dual-track document processing: 1. UnifiedDocument Model (backend/app/models/unified_document.py) - Common output format for both OCR and direct extraction - Comprehensive element types (23+ types from PP-StructureV3) - BoundingBox, StyleInfo, TableData structures - Backward compatibility with legacy format 2. DocumentTypeDetector Service (backend/app/services/document_type_detector.py) - Intelligent document type detection using python-magic - PDF editability analysis using PyMuPDF - Processing track recommendation with confidence scores - Support for PDF, images, Office docs, and text files 3. DirectExtractionEngine Service (backend/app/services/direct_extraction_engine.py) - Fast extraction from editable PDFs using PyMuPDF - Preserves fonts, colors, and exact positioning - Native and positional table detection - Image extraction with coordinates - Hyperlink and metadata extraction 4. Dependencies - Added PyMuPDF>=1.23.0 for PDF extraction - Added pdfplumber>=0.10.0 as fallback - Added python-magic-bin>=0.4.14 for file detection Next: Integrate with OCR service for complete dual-track processing 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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backend/app/models/unified_document.py
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backend/app/models/unified_document.py
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"""
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Unified Document Model for Dual-track Processing
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This module defines the common data structure used by both OCR and direct extraction tracks
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to ensure consistent output format regardless of processing method.
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"""
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from dataclasses import dataclass, field
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from typing import List, Dict, Optional, Union, Literal, Any
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from datetime import datetime
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from enum import Enum
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class ElementType(str, Enum):
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"""Document element types supporting all 23 PP-StructureV3 types plus custom ones"""
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# Text elements
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TEXT = "text"
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TITLE = "title"
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HEADER = "header"
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FOOTER = "footer"
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REFERENCE = "reference"
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EQUATION = "equation"
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FOOTNOTE = "footnote"
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CAPTION = "caption"
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# List elements
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LIST = "list"
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LIST_ITEM = "list_item"
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# Table elements
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TABLE = "table"
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TABLE_CELL = "table_cell"
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TABLE_CAPTION = "table_caption"
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# Visual elements
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IMAGE = "image"
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FIGURE = "figure"
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CHART = "chart"
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DIAGRAM = "diagram"
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# Structural elements
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SECTION = "section"
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PARAGRAPH = "paragraph"
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PAGE_NUMBER = "page_number"
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WATERMARK = "watermark"
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HEADER_GROUP = "header_group"
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BODY = "body"
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# Special elements
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CODE = "code"
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FORMULA = "formula"
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SIGNATURE = "signature"
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STAMP = "stamp"
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LOGO = "logo"
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BARCODE = "barcode"
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QR_CODE = "qr_code"
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class ProcessingTrack(str, Enum):
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"""Processing track used for the document"""
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OCR = "ocr" # PaddleOCR PP-StructureV3 track
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DIRECT = "direct" # PyMuPDF direct extraction track
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HYBRID = "hybrid" # Mixed processing (future)
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@dataclass
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class BoundingBox:
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"""Bounding box coordinates for document elements"""
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x0: float # Left coordinate
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y0: float # Top coordinate
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x1: float # Right coordinate
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y1: float # Bottom coordinate
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@property
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def width(self) -> float:
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return self.x1 - self.x0
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@property
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def height(self) -> float:
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return self.y1 - self.y0
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@property
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def center_x(self) -> float:
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return (self.x0 + self.x1) / 2
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@property
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def center_y(self) -> float:
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return (self.y0 + self.y1) / 2
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def to_dict(self) -> Dict[str, float]:
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return {
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"x0": self.x0,
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"y0": self.y0,
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"x1": self.x1,
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"y1": self.y1,
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"width": self.width,
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"height": self.height
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}
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def overlaps(self, other: 'BoundingBox', tolerance: float = 0) -> bool:
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"""Check if this bbox overlaps with another"""
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return not (
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self.x1 + tolerance < other.x0 or
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self.x0 - tolerance > other.x1 or
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self.y1 + tolerance < other.y0 or
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self.y0 - tolerance > other.y1
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)
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def contains(self, other: 'BoundingBox', tolerance: float = 0) -> bool:
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"""Check if this bbox contains another"""
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return (
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self.x0 - tolerance <= other.x0 and
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self.y0 - tolerance <= other.y0 and
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self.x1 + tolerance >= other.x1 and
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self.y1 + tolerance >= other.y1
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)
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@dataclass
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class StyleInfo:
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"""Style information for text elements"""
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font_name: Optional[str] = None
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font_size: Optional[float] = None
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font_weight: Optional[str] = None # normal, bold
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font_style: Optional[str] = None # normal, italic
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text_color: Optional[int] = None # RGB as integer
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bg_color: Optional[int] = None # Background color
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alignment: Optional[str] = None # left, center, right, justify
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@property
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def is_bold(self) -> bool:
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return self.font_weight == "bold"
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@property
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def is_italic(self) -> bool:
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return self.font_style == "italic"
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def get_rgb_color(self) -> Optional[tuple]:
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"""Convert integer color to RGB tuple"""
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if self.text_color is None:
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return None
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r = (self.text_color >> 16) & 0xFF
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g = (self.text_color >> 8) & 0xFF
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b = self.text_color & 0xFF
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return (r, g, b)
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def to_dict(self) -> Dict[str, Any]:
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result = {}
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if self.font_name:
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result["font_name"] = self.font_name
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if self.font_size:
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result["font_size"] = self.font_size
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if self.font_weight:
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result["font_weight"] = self.font_weight
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if self.font_style:
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result["font_style"] = self.font_style
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if self.text_color is not None:
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result["text_color"] = self.text_color
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result["text_color_rgb"] = self.get_rgb_color()
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if self.bg_color is not None:
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result["bg_color"] = self.bg_color
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if self.alignment:
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result["alignment"] = self.alignment
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return result
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@dataclass
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class TableCell:
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"""Table cell information"""
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row: int
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col: int
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row_span: int = 1
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col_span: int = 1
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content: str = ""
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bbox: Optional[BoundingBox] = None
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style: Optional[StyleInfo] = None
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def to_dict(self) -> Dict[str, Any]:
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return {
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"row": self.row,
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"col": self.col,
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"row_span": self.row_span,
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"col_span": self.col_span,
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"content": self.content,
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"bbox": self.bbox.to_dict() if self.bbox else None,
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"style": self.style.to_dict() if self.style else None
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}
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@dataclass
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class TableData:
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"""Structured table data"""
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rows: int
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cols: int
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cells: List[TableCell] = field(default_factory=list)
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headers: Optional[List[str]] = None
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caption: Optional[str] = None
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def to_dict(self) -> Dict[str, Any]:
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return {
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"rows": self.rows,
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"cols": self.cols,
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"cells": [cell.to_dict() for cell in self.cells],
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"headers": self.headers,
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"caption": self.caption
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}
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def to_html(self) -> str:
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"""Convert table to HTML representation"""
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html = ["<table>"]
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if self.caption:
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html.append(f"<caption>{self.caption}</caption>")
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# Group cells by row
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rows_data = {}
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for cell in self.cells:
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if cell.row not in rows_data:
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rows_data[cell.row] = []
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rows_data[cell.row].append(cell)
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# Generate HTML
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for row_idx in range(self.rows):
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html.append("<tr>")
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if row_idx in rows_data:
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for cell in sorted(rows_data[row_idx], key=lambda c: c.col):
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span_attrs = []
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if cell.row_span > 1:
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span_attrs.append(f'rowspan="{cell.row_span}"')
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if cell.col_span > 1:
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span_attrs.append(f'colspan="{cell.col_span}"')
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span_str = " ".join(span_attrs)
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tag = "th" if row_idx == 0 and self.headers else "td"
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html.append(f'<{tag} {span_str}>{cell.content}</{tag}>')
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html.append("</tr>")
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html.append("</table>")
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return "\n".join(html)
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@dataclass
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class DocumentElement:
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"""Individual document element (text, image, table, etc.)"""
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element_id: str
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type: ElementType
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content: Union[str, TableData, bytes, Dict[str, Any]]
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bbox: BoundingBox
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confidence: Optional[float] = None # OCR confidence (0-1)
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style: Optional[StyleInfo] = None
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metadata: Dict[str, Any] = field(default_factory=dict)
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children: List['DocumentElement'] = field(default_factory=list)
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@property
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def is_text(self) -> bool:
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return self.type in [
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ElementType.TEXT, ElementType.TITLE, ElementType.HEADER,
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ElementType.FOOTER, ElementType.CAPTION, ElementType.PARAGRAPH
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]
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@property
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def is_visual(self) -> bool:
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return self.type in [
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ElementType.IMAGE, ElementType.FIGURE, ElementType.CHART,
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ElementType.DIAGRAM, ElementType.LOGO
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]
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@property
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def is_table(self) -> bool:
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return self.type in [ElementType.TABLE, ElementType.TABLE_CELL]
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def get_text(self) -> str:
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"""Extract text content from element"""
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if isinstance(self.content, str):
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return self.content
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elif isinstance(self.content, TableData):
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# Extract text from table cells
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texts = []
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for cell in self.content.cells:
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if cell.content:
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texts.append(cell.content)
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return " ".join(texts)
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elif isinstance(self.content, dict) and "text" in self.content:
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return self.content["text"]
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return ""
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def to_dict(self) -> Dict[str, Any]:
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"""Convert to dictionary for JSON serialization"""
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result = {
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"element_id": self.element_id,
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"type": self.type.value,
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"bbox": self.bbox.to_dict(),
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}
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# Handle different content types
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if isinstance(self.content, str):
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result["content"] = self.content
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elif isinstance(self.content, TableData):
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result["content"] = self.content.to_dict()
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result["content_type"] = "table"
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elif isinstance(self.content, bytes):
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result["content_type"] = "binary"
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result["content_length"] = len(self.content)
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elif isinstance(self.content, dict):
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result["content"] = self.content
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if self.confidence is not None:
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result["confidence"] = self.confidence
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if self.style:
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result["style"] = self.style.to_dict()
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if self.metadata:
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result["metadata"] = self.metadata
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if self.children:
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result["children"] = [child.to_dict() for child in self.children]
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return result
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@dataclass
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class Dimensions:
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"""Page or image dimensions"""
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width: float
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height: float
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dpi: Optional[int] = None
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def to_dict(self) -> Dict[str, Any]:
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result = {"width": self.width, "height": self.height}
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if self.dpi:
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result["dpi"] = self.dpi
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return result
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@dataclass
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class Page:
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"""Single page in a document"""
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page_number: int # 1-based page number
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elements: List[DocumentElement]
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dimensions: Dimensions
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metadata: Dict[str, Any] = field(default_factory=dict)
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def get_reading_order(self) -> List[DocumentElement]:
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"""Get elements in reading order (top to bottom, left to right)"""
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return sorted(
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self.elements,
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key=lambda e: (e.bbox.y0, e.bbox.x0)
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)
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def get_elements_by_type(self, element_type: ElementType) -> List[DocumentElement]:
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"""Get all elements of a specific type"""
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return [e for e in self.elements if e.type == element_type]
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def get_text_elements(self) -> List[DocumentElement]:
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"""Get all text-containing elements"""
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return [e for e in self.elements if e.is_text]
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def get_tables(self) -> List[DocumentElement]:
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"""Get all table elements"""
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return [e for e in self.elements if e.type == ElementType.TABLE]
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def get_images(self) -> List[DocumentElement]:
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"""Get all image elements"""
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return [e for e in self.elements if e.is_visual]
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def extract_text(self, separator: str = "\n") -> str:
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"""Extract all text from the page in reading order"""
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texts = []
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for element in self.get_reading_order():
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text = element.get_text()
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if text:
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texts.append(text)
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return separator.join(texts)
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def to_dict(self) -> Dict[str, Any]:
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"""Convert to dictionary for JSON serialization"""
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return {
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"page_number": self.page_number,
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"elements": [e.to_dict() for e in self.elements],
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"dimensions": self.dimensions.to_dict(),
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"metadata": self.metadata,
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"statistics": {
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"total_elements": len(self.elements),
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"text_elements": len(self.get_text_elements()),
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"tables": len(self.get_tables()),
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"images": len(self.get_images())
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}
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}
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@dataclass
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class DocumentMetadata:
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"""Document-level metadata"""
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filename: str
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file_type: str
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file_size: int
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created_at: datetime
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processing_track: ProcessingTrack
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processing_time: float # seconds
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language: Optional[str] = None
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title: Optional[str] = None
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author: Optional[str] = None
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subject: Optional[str] = None
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keywords: Optional[List[str]] = None
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producer: Optional[str] = None
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creator: Optional[str] = None
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creation_date: Optional[datetime] = None
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modification_date: Optional[datetime] = None
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def to_dict(self) -> Dict[str, Any]:
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"""Convert to dictionary for JSON serialization"""
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result = {
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"filename": self.filename,
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"file_type": self.file_type,
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"file_size": self.file_size,
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"created_at": self.created_at.isoformat(),
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"processing_track": self.processing_track.value,
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"processing_time": self.processing_time,
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}
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# Add optional fields if present
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optional_fields = [
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"language", "title", "author", "subject",
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"keywords", "producer", "creator"
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]
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for field in optional_fields:
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value = getattr(self, field)
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if value is not None:
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result[field] = value
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if self.creation_date:
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result["creation_date"] = self.creation_date.isoformat()
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if self.modification_date:
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result["modification_date"] = self.modification_date.isoformat()
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return result
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@dataclass
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class UnifiedDocument:
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"""
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Unified document representation for both OCR and direct extraction tracks.
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This is the primary output format that ensures consistency across different
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processing methods and enables seamless downstream processing.
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"""
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document_id: str
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metadata: DocumentMetadata
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pages: List[Page]
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processing_errors: List[Dict[str, Any]] = field(default_factory=list)
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@property
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def page_count(self) -> int:
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return len(self.pages)
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@property
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def total_elements(self) -> int:
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return sum(len(page.elements) for page in self.pages)
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def get_page(self, page_number: int) -> Optional[Page]:
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"""Get page by number (1-based)"""
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for page in self.pages:
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if page.page_number == page_number:
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return page
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return None
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def extract_all_text(self, page_separator: str = "\n\n") -> str:
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||||
"""Extract all text from the document"""
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||||
texts = []
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for page in self.pages:
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||||
page_text = page.extract_text()
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||||
if page_text:
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||||
texts.append(page_text)
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||||
return page_separator.join(texts)
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||||
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def get_all_tables(self) -> List[DocumentElement]:
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"""Get all tables from all pages"""
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||||
tables = []
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||||
for page in self.pages:
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||||
tables.extend(page.get_tables())
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||||
return tables
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||||
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||||
def get_all_images(self) -> List[DocumentElement]:
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||||
"""Get all images from all pages"""
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||||
images = []
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||||
for page in self.pages:
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||||
images.extend(page.get_images())
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||||
return images
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||||
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||||
def to_dict(self) -> Dict[str, Any]:
|
||||
"""Convert to dictionary for JSON serialization"""
|
||||
return {
|
||||
"document_id": self.document_id,
|
||||
"metadata": self.metadata.to_dict(),
|
||||
"pages": [page.to_dict() for page in self.pages],
|
||||
"statistics": {
|
||||
"page_count": self.page_count,
|
||||
"total_elements": self.total_elements,
|
||||
"total_tables": len(self.get_all_tables()),
|
||||
"total_images": len(self.get_all_images()),
|
||||
},
|
||||
"processing_errors": self.processing_errors
|
||||
}
|
||||
|
||||
def to_legacy_format(self) -> Dict[str, Any]:
|
||||
"""
|
||||
Convert to legacy format for backward compatibility.
|
||||
|
||||
This ensures existing API clients continue to work while we transition
|
||||
to the new unified format.
|
||||
"""
|
||||
# Extract text regions in legacy format
|
||||
text_regions = []
|
||||
layout_data = []
|
||||
images_metadata = []
|
||||
|
||||
for page in self.pages:
|
||||
page_num = page.page_number
|
||||
|
||||
for element in page.elements:
|
||||
if element.is_text:
|
||||
# Legacy text region format
|
||||
text_regions.append({
|
||||
"page": page_num,
|
||||
"text": element.get_text(),
|
||||
"confidence": element.confidence or 1.0,
|
||||
"bbox": {
|
||||
"x_min": element.bbox.x0,
|
||||
"y_min": element.bbox.y0,
|
||||
"x_max": element.bbox.x1,
|
||||
"y_max": element.bbox.y1
|
||||
}
|
||||
})
|
||||
|
||||
# Legacy layout data
|
||||
layout_item = {
|
||||
"element_id": element.element_id,
|
||||
"type": element.type.value,
|
||||
"page": page_num - 1, # Legacy uses 0-based
|
||||
"bbox": [element.bbox.x0, element.bbox.y0,
|
||||
element.bbox.x1, element.bbox.y1]
|
||||
}
|
||||
|
||||
if element.is_table and isinstance(element.content, TableData):
|
||||
layout_item["content"] = element.content.to_html()
|
||||
elif element.is_text:
|
||||
layout_item["content"] = element.get_text()
|
||||
|
||||
layout_data.append(layout_item)
|
||||
|
||||
# Legacy image metadata
|
||||
if element.is_visual:
|
||||
images_metadata.append({
|
||||
"element_id": element.element_id,
|
||||
"type": "image",
|
||||
"page": page_num - 1, # Legacy uses 0-based
|
||||
"bbox": [element.bbox.x0, element.bbox.y0,
|
||||
element.bbox.x1, element.bbox.y1]
|
||||
})
|
||||
|
||||
# Calculate average confidence
|
||||
confidences = [r["confidence"] for r in text_regions if r.get("confidence")]
|
||||
avg_confidence = sum(confidences) / len(confidences) if confidences else 0.0
|
||||
|
||||
return {
|
||||
"status": "success",
|
||||
"filename": self.metadata.filename,
|
||||
"text_regions": text_regions,
|
||||
"total_text_regions": len(text_regions),
|
||||
"average_confidence": avg_confidence,
|
||||
"processing_time": self.metadata.processing_time,
|
||||
"language": self.metadata.language or "ch",
|
||||
"layout_data": {
|
||||
"elements": layout_data,
|
||||
"total_elements": len(layout_data)
|
||||
},
|
||||
"images_metadata": images_metadata,
|
||||
"ocr_dimensions": {
|
||||
"width": self.pages[0].dimensions.width if self.pages else 0,
|
||||
"height": self.pages[0].dimensions.height if self.pages else 0
|
||||
},
|
||||
# New fields that won't break existing clients
|
||||
"_unified_format": True,
|
||||
"_processing_track": self.metadata.processing_track.value
|
||||
}
|
||||
|
||||
|
||||
class UnifiedDocumentConverter:
|
||||
"""Converter utilities for UnifiedDocument format"""
|
||||
|
||||
@staticmethod
|
||||
def from_ocr_result(ocr_result: Dict[str, Any],
|
||||
document_id: str,
|
||||
metadata: DocumentMetadata) -> UnifiedDocument:
|
||||
"""
|
||||
Convert PaddleOCR result to UnifiedDocument format.
|
||||
|
||||
This handles the conversion from PP-StructureV3 output to our unified format.
|
||||
"""
|
||||
pages = []
|
||||
|
||||
# Handle single page or multi-page results
|
||||
if "pages" in ocr_result:
|
||||
page_results = ocr_result["pages"]
|
||||
else:
|
||||
page_results = [ocr_result]
|
||||
|
||||
for page_idx, page_data in enumerate(page_results):
|
||||
page_num = page_idx + 1
|
||||
elements = []
|
||||
|
||||
# Convert text regions
|
||||
for idx, text_region in enumerate(page_data.get("text_regions", [])):
|
||||
bbox_data = text_region.get("bbox", {})
|
||||
element = DocumentElement(
|
||||
element_id=f"text_{page_num}_{idx}",
|
||||
type=ElementType.TEXT,
|
||||
content=text_region.get("text", ""),
|
||||
bbox=BoundingBox(
|
||||
x0=bbox_data.get("x_min", 0),
|
||||
y0=bbox_data.get("y_min", 0),
|
||||
x1=bbox_data.get("x_max", 0),
|
||||
y1=bbox_data.get("y_max", 0)
|
||||
),
|
||||
confidence=text_region.get("confidence")
|
||||
)
|
||||
elements.append(element)
|
||||
|
||||
# Convert layout elements if available
|
||||
if "layout_data" in page_data and page_data["layout_data"]:
|
||||
for layout_elem in page_data["layout_data"].get("elements", []):
|
||||
# Map layout type to ElementType
|
||||
layout_type = layout_elem.get("type", "text")
|
||||
element_type = ElementType.TEXT # Default
|
||||
|
||||
if "table" in layout_type.lower():
|
||||
element_type = ElementType.TABLE
|
||||
elif "image" in layout_type.lower() or "figure" in layout_type.lower():
|
||||
element_type = ElementType.IMAGE
|
||||
elif "title" in layout_type.lower():
|
||||
element_type = ElementType.TITLE
|
||||
elif "list" in layout_type.lower():
|
||||
element_type = ElementType.LIST
|
||||
|
||||
# Create element
|
||||
bbox_list = layout_elem.get("bbox", [0, 0, 0, 0])
|
||||
element = DocumentElement(
|
||||
element_id=layout_elem.get("element_id", f"layout_{page_num}_{len(elements)}"),
|
||||
type=element_type,
|
||||
content=layout_elem.get("content", ""),
|
||||
bbox=BoundingBox(
|
||||
x0=bbox_list[0] if len(bbox_list) > 0 else 0,
|
||||
y0=bbox_list[1] if len(bbox_list) > 1 else 0,
|
||||
x1=bbox_list[2] if len(bbox_list) > 2 else 0,
|
||||
y1=bbox_list[3] if len(bbox_list) > 3 else 0
|
||||
)
|
||||
)
|
||||
elements.append(element)
|
||||
|
||||
# Get page dimensions
|
||||
ocr_dims = page_data.get("ocr_dimensions", {})
|
||||
dimensions = Dimensions(
|
||||
width=ocr_dims.get("width", 0),
|
||||
height=ocr_dims.get("height", 0)
|
||||
)
|
||||
|
||||
pages.append(Page(
|
||||
page_number=page_num,
|
||||
elements=elements,
|
||||
dimensions=dimensions
|
||||
))
|
||||
|
||||
return UnifiedDocument(
|
||||
document_id=document_id,
|
||||
metadata=metadata,
|
||||
pages=pages
|
||||
)
|
||||
|
||||
@staticmethod
|
||||
def from_direct_extraction(extraction_result: Dict[str, Any],
|
||||
document_id: str,
|
||||
metadata: DocumentMetadata) -> UnifiedDocument:
|
||||
"""
|
||||
Convert PyMuPDF extraction result to UnifiedDocument format.
|
||||
|
||||
This will be implemented when we create the DirectExtractionEngine.
|
||||
"""
|
||||
# TODO: Implement when DirectExtractionEngine is created
|
||||
pages = []
|
||||
return UnifiedDocument(
|
||||
document_id=document_id,
|
||||
metadata=metadata,
|
||||
pages=pages
|
||||
)
|
||||
633
backend/app/services/direct_extraction_engine.py
Normal file
633
backend/app/services/direct_extraction_engine.py
Normal file
@@ -0,0 +1,633 @@
|
||||
"""
|
||||
Direct Extraction Engine using PyMuPDF
|
||||
|
||||
Handles direct text and structure extraction from editable PDFs without OCR.
|
||||
This provides much faster processing and perfect accuracy for documents with
|
||||
extractable text.
|
||||
"""
|
||||
|
||||
import os
|
||||
import logging
|
||||
import fitz # PyMuPDF
|
||||
import uuid
|
||||
from pathlib import Path
|
||||
from typing import Dict, List, Optional, Tuple, Any, Union
|
||||
from datetime import datetime
|
||||
import re
|
||||
|
||||
from ..models.unified_document import (
|
||||
UnifiedDocument, DocumentElement, Page, DocumentMetadata,
|
||||
BoundingBox, StyleInfo, TableData, TableCell, Dimensions,
|
||||
ElementType, ProcessingTrack
|
||||
)
|
||||
|
||||
logger = logging.getLogger(__name__)
|
||||
|
||||
|
||||
class DirectExtractionEngine:
|
||||
"""
|
||||
Engine for direct text extraction from editable PDFs using PyMuPDF.
|
||||
|
||||
This engine provides:
|
||||
- Fast text extraction with exact positioning
|
||||
- Font and style information preservation
|
||||
- Table structure detection
|
||||
- Image extraction with coordinates
|
||||
- Hyperlink and annotation extraction
|
||||
"""
|
||||
|
||||
def __init__(self,
|
||||
enable_table_detection: bool = True,
|
||||
enable_image_extraction: bool = True,
|
||||
min_table_rows: int = 2,
|
||||
min_table_cols: int = 2):
|
||||
"""
|
||||
Initialize the extraction engine.
|
||||
|
||||
Args:
|
||||
enable_table_detection: Whether to detect and extract tables
|
||||
enable_image_extraction: Whether to extract images
|
||||
min_table_rows: Minimum rows for table detection
|
||||
min_table_cols: Minimum columns for table detection
|
||||
"""
|
||||
self.enable_table_detection = enable_table_detection
|
||||
self.enable_image_extraction = enable_image_extraction
|
||||
self.min_table_rows = min_table_rows
|
||||
self.min_table_cols = min_table_cols
|
||||
|
||||
def extract(self,
|
||||
file_path: Path,
|
||||
output_dir: Optional[Path] = None) -> UnifiedDocument:
|
||||
"""
|
||||
Extract content from PDF file to UnifiedDocument format.
|
||||
|
||||
Args:
|
||||
file_path: Path to PDF file
|
||||
output_dir: Optional directory to save extracted images
|
||||
|
||||
Returns:
|
||||
UnifiedDocument with extracted content
|
||||
"""
|
||||
start_time = datetime.now()
|
||||
document_id = str(uuid.uuid4())
|
||||
|
||||
try:
|
||||
doc = fitz.open(str(file_path))
|
||||
|
||||
# Extract document metadata
|
||||
metadata = self._extract_metadata(file_path, doc, start_time)
|
||||
|
||||
# Extract pages
|
||||
pages = []
|
||||
for page_num in range(len(doc)):
|
||||
logger.info(f"Extracting page {page_num + 1}/{len(doc)}")
|
||||
page = self._extract_page(
|
||||
doc[page_num],
|
||||
page_num + 1,
|
||||
document_id,
|
||||
output_dir
|
||||
)
|
||||
pages.append(page)
|
||||
|
||||
doc.close()
|
||||
|
||||
# Calculate processing time
|
||||
processing_time = (datetime.now() - start_time).total_seconds()
|
||||
metadata.processing_time = processing_time
|
||||
|
||||
logger.info(f"Direct extraction completed in {processing_time:.2f}s")
|
||||
|
||||
return UnifiedDocument(
|
||||
document_id=document_id,
|
||||
metadata=metadata,
|
||||
pages=pages
|
||||
)
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error during direct extraction: {e}")
|
||||
# Return partial result with error information
|
||||
processing_time = (datetime.now() - start_time).total_seconds()
|
||||
|
||||
if 'metadata' not in locals():
|
||||
metadata = DocumentMetadata(
|
||||
filename=file_path.name,
|
||||
file_type="pdf",
|
||||
file_size=file_path.stat().st_size if file_path.exists() else 0,
|
||||
created_at=datetime.now(),
|
||||
processing_track=ProcessingTrack.DIRECT,
|
||||
processing_time=processing_time
|
||||
)
|
||||
|
||||
return UnifiedDocument(
|
||||
document_id=document_id,
|
||||
metadata=metadata,
|
||||
pages=pages if 'pages' in locals() else [],
|
||||
processing_errors=[{
|
||||
"error": str(e),
|
||||
"type": type(e).__name__
|
||||
}]
|
||||
)
|
||||
|
||||
def _extract_metadata(self,
|
||||
file_path: Path,
|
||||
doc: fitz.Document,
|
||||
start_time: datetime) -> DocumentMetadata:
|
||||
"""Extract document metadata"""
|
||||
pdf_metadata = doc.metadata
|
||||
|
||||
return DocumentMetadata(
|
||||
filename=file_path.name,
|
||||
file_type="pdf",
|
||||
file_size=file_path.stat().st_size,
|
||||
created_at=start_time,
|
||||
processing_track=ProcessingTrack.DIRECT,
|
||||
processing_time=0.0, # Will be updated later
|
||||
title=pdf_metadata.get("title"),
|
||||
author=pdf_metadata.get("author"),
|
||||
subject=pdf_metadata.get("subject"),
|
||||
keywords=pdf_metadata.get("keywords", "").split(",") if pdf_metadata.get("keywords") else None,
|
||||
producer=pdf_metadata.get("producer"),
|
||||
creator=pdf_metadata.get("creator"),
|
||||
creation_date=self._parse_pdf_date(pdf_metadata.get("creationDate")),
|
||||
modification_date=self._parse_pdf_date(pdf_metadata.get("modDate"))
|
||||
)
|
||||
|
||||
def _parse_pdf_date(self, date_str: str) -> Optional[datetime]:
|
||||
"""Parse PDF date string to datetime"""
|
||||
if not date_str:
|
||||
return None
|
||||
|
||||
try:
|
||||
# PDF date format: D:YYYYMMDDHHmmSSOHH'mm
|
||||
# Example: D:20240101120000+09'00
|
||||
if date_str.startswith("D:"):
|
||||
date_str = date_str[2:]
|
||||
|
||||
# Extract just the date/time part (first 14 characters)
|
||||
if len(date_str) >= 14:
|
||||
date_part = date_str[:14]
|
||||
return datetime.strptime(date_part, "%Y%m%d%H%M%S")
|
||||
except:
|
||||
pass
|
||||
|
||||
return None
|
||||
|
||||
def _extract_page(self,
|
||||
page: fitz.Page,
|
||||
page_num: int,
|
||||
document_id: str,
|
||||
output_dir: Optional[Path]) -> Page:
|
||||
"""Extract content from a single page"""
|
||||
elements = []
|
||||
element_counter = 0
|
||||
|
||||
# Get page dimensions
|
||||
rect = page.rect
|
||||
dimensions = Dimensions(
|
||||
width=rect.width,
|
||||
height=rect.height,
|
||||
dpi=72 # PDF standard DPI
|
||||
)
|
||||
|
||||
# Extract text blocks with formatting
|
||||
text_dict = page.get_text("dict")
|
||||
for block_idx, block in enumerate(text_dict.get("blocks", [])):
|
||||
if block.get("type") == 0: # Text block
|
||||
element = self._process_text_block(
|
||||
block, page_num, element_counter
|
||||
)
|
||||
if element:
|
||||
elements.append(element)
|
||||
element_counter += 1
|
||||
|
||||
# Extract tables (if enabled)
|
||||
if self.enable_table_detection:
|
||||
try:
|
||||
# Try native table detection (PyMuPDF 1.23.0+)
|
||||
tables = page.find_tables()
|
||||
for table_idx, table in enumerate(tables):
|
||||
element = self._process_native_table(
|
||||
table, page_num, element_counter
|
||||
)
|
||||
if element:
|
||||
elements.append(element)
|
||||
element_counter += 1
|
||||
except AttributeError:
|
||||
# Fallback to positional table detection
|
||||
logger.debug("Native table detection not available, using positional detection")
|
||||
table_elements = self._detect_tables_by_position(page, page_num, element_counter)
|
||||
elements.extend(table_elements)
|
||||
element_counter += len(table_elements)
|
||||
|
||||
# Extract images (if enabled)
|
||||
if self.enable_image_extraction:
|
||||
image_elements = self._extract_images(
|
||||
page, page_num, document_id, element_counter, output_dir
|
||||
)
|
||||
elements.extend(image_elements)
|
||||
element_counter += len(image_elements)
|
||||
|
||||
# Extract hyperlinks
|
||||
links = page.get_links()
|
||||
for link_idx, link in enumerate(links):
|
||||
# Create link annotation element if it has URI
|
||||
if link.get("uri"):
|
||||
from_rect = link.get("from")
|
||||
if from_rect:
|
||||
element = DocumentElement(
|
||||
element_id=f"link_{page_num}_{element_counter}",
|
||||
type=ElementType.REFERENCE,
|
||||
content={"uri": link["uri"], "type": "hyperlink"},
|
||||
bbox=BoundingBox(
|
||||
x0=from_rect.x0,
|
||||
y0=from_rect.y0,
|
||||
x1=from_rect.x1,
|
||||
y1=from_rect.y1
|
||||
),
|
||||
metadata={"link_type": "external" if link["uri"].startswith("http") else "internal"}
|
||||
)
|
||||
elements.append(element)
|
||||
element_counter += 1
|
||||
|
||||
# Extract vector graphics (as metadata)
|
||||
drawings = page.get_drawings()
|
||||
if drawings:
|
||||
logger.debug(f"Page {page_num} contains {len(drawings)} vector drawing commands")
|
||||
|
||||
return Page(
|
||||
page_number=page_num,
|
||||
elements=elements,
|
||||
dimensions=dimensions,
|
||||
metadata={
|
||||
"has_drawings": len(drawings) > 0,
|
||||
"drawing_count": len(drawings),
|
||||
"link_count": len(links)
|
||||
}
|
||||
)
|
||||
|
||||
def _process_text_block(self, block: Dict, page_num: int, counter: int) -> Optional[DocumentElement]:
|
||||
"""Process a text block into a DocumentElement"""
|
||||
# Calculate block bounding box
|
||||
bbox_data = block.get("bbox", [0, 0, 0, 0])
|
||||
bbox = BoundingBox(
|
||||
x0=bbox_data[0],
|
||||
y0=bbox_data[1],
|
||||
x1=bbox_data[2],
|
||||
y1=bbox_data[3]
|
||||
)
|
||||
|
||||
# Extract text content
|
||||
text_parts = []
|
||||
styles = []
|
||||
|
||||
for line in block.get("lines", []):
|
||||
for span in line.get("spans", []):
|
||||
text = span.get("text", "")
|
||||
if text:
|
||||
text_parts.append(text)
|
||||
|
||||
# Extract style information
|
||||
style = StyleInfo(
|
||||
font_name=span.get("font"),
|
||||
font_size=span.get("size"),
|
||||
font_weight="bold" if span.get("flags", 0) & 2**4 else "normal",
|
||||
font_style="italic" if span.get("flags", 0) & 2**1 else "normal",
|
||||
text_color=span.get("color")
|
||||
)
|
||||
styles.append(style)
|
||||
|
||||
if not text_parts:
|
||||
return None
|
||||
|
||||
full_text = "".join(text_parts)
|
||||
|
||||
# Determine element type based on content and style
|
||||
element_type = self._infer_element_type(full_text, styles)
|
||||
|
||||
# Use the most common style for the block
|
||||
if styles:
|
||||
block_style = styles[0] # Could be improved with style merging
|
||||
else:
|
||||
block_style = None
|
||||
|
||||
return DocumentElement(
|
||||
element_id=f"text_{page_num}_{counter}",
|
||||
type=element_type,
|
||||
content=full_text,
|
||||
bbox=bbox,
|
||||
style=block_style,
|
||||
confidence=1.0 # Direct extraction has perfect confidence
|
||||
)
|
||||
|
||||
def _infer_element_type(self, text: str, styles: List[StyleInfo]) -> ElementType:
|
||||
"""Infer element type based on text content and styling"""
|
||||
text_lower = text.lower().strip()
|
||||
|
||||
# Check for common patterns
|
||||
if len(text_lower) < 100 and styles:
|
||||
# Short text with large font might be title/header
|
||||
avg_size = sum(s.font_size or 12 for s in styles) / len(styles)
|
||||
if avg_size > 16:
|
||||
return ElementType.TITLE
|
||||
elif avg_size > 14:
|
||||
return ElementType.HEADER
|
||||
|
||||
# Check for list patterns
|
||||
if re.match(r'^[\d•·▪▫◦‣⁃]\s', text_lower):
|
||||
return ElementType.LIST_ITEM
|
||||
|
||||
# Check for page numbers
|
||||
if re.match(r'^page\s+\d+|^\d+\s*$|^-\s*\d+\s*-$', text_lower):
|
||||
return ElementType.PAGE_NUMBER
|
||||
|
||||
# Check for footnote patterns
|
||||
if re.match(r'^[\[\d+\]]|^\d+\)', text_lower):
|
||||
return ElementType.FOOTNOTE
|
||||
|
||||
# Default to paragraph for longer text, text for shorter
|
||||
return ElementType.PARAGRAPH if len(text) > 150 else ElementType.TEXT
|
||||
|
||||
def _process_native_table(self, table, page_num: int, counter: int) -> Optional[DocumentElement]:
|
||||
"""Process a natively detected table"""
|
||||
try:
|
||||
# Extract table data
|
||||
data = table.extract()
|
||||
if not data or len(data) < self.min_table_rows:
|
||||
return None
|
||||
|
||||
# Get table bounding box
|
||||
bbox_data = table.bbox
|
||||
bbox = BoundingBox(
|
||||
x0=bbox_data[0],
|
||||
y0=bbox_data[1],
|
||||
x1=bbox_data[2],
|
||||
y1=bbox_data[3]
|
||||
)
|
||||
|
||||
# Create table cells
|
||||
cells = []
|
||||
for row_idx, row in enumerate(data):
|
||||
for col_idx, cell_text in enumerate(row):
|
||||
if cell_text:
|
||||
cells.append(TableCell(
|
||||
row=row_idx,
|
||||
col=col_idx,
|
||||
content=str(cell_text) if cell_text else ""
|
||||
))
|
||||
|
||||
# Create table data
|
||||
table_data = TableData(
|
||||
rows=len(data),
|
||||
cols=max(len(row) for row in data) if data else 0,
|
||||
cells=cells,
|
||||
headers=data[0] if data else None # Assume first row is header
|
||||
)
|
||||
|
||||
return DocumentElement(
|
||||
element_id=f"table_{page_num}_{counter}",
|
||||
type=ElementType.TABLE,
|
||||
content=table_data,
|
||||
bbox=bbox,
|
||||
confidence=1.0
|
||||
)
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error processing native table: {e}")
|
||||
return None
|
||||
|
||||
def _detect_tables_by_position(self, page: fitz.Page, page_num: int, counter: int) -> List[DocumentElement]:
|
||||
"""Detect tables by analyzing text positioning"""
|
||||
tables = []
|
||||
|
||||
# Get all words with positions
|
||||
words = page.get_text("words") # Returns (x0, y0, x1, y1, "word", block_no, line_no, word_no)
|
||||
|
||||
if not words:
|
||||
return tables
|
||||
|
||||
# Group words by approximate row (y-coordinate)
|
||||
rows = {}
|
||||
for word in words:
|
||||
y = round(word[1] / 5) * 5 # Round to nearest 5 points
|
||||
if y not in rows:
|
||||
rows[y] = []
|
||||
rows[y].append({
|
||||
'x0': word[0],
|
||||
'y0': word[1],
|
||||
'x1': word[2],
|
||||
'y1': word[3],
|
||||
'text': word[4],
|
||||
'block': word[5] if len(word) > 5 else 0
|
||||
})
|
||||
|
||||
# Sort rows by y-coordinate
|
||||
sorted_rows = sorted(rows.items(), key=lambda x: x[0])
|
||||
|
||||
# Find potential tables (consecutive rows with multiple columns)
|
||||
current_table_rows = []
|
||||
tables_found = []
|
||||
|
||||
for y, words_in_row in sorted_rows:
|
||||
words_in_row.sort(key=lambda w: w['x0'])
|
||||
|
||||
if len(words_in_row) >= self.min_table_cols:
|
||||
# Check if this could be a table row
|
||||
x_positions = [w['x0'] for w in words_in_row]
|
||||
|
||||
# Check for somewhat regular spacing
|
||||
if self._has_regular_spacing(x_positions):
|
||||
current_table_rows.append((y, words_in_row))
|
||||
else:
|
||||
# End current table if exists
|
||||
if len(current_table_rows) >= self.min_table_rows:
|
||||
tables_found.append(current_table_rows)
|
||||
current_table_rows = []
|
||||
else:
|
||||
# End current table if exists
|
||||
if len(current_table_rows) >= self.min_table_rows:
|
||||
tables_found.append(current_table_rows)
|
||||
current_table_rows = []
|
||||
|
||||
# Don't forget the last table
|
||||
if len(current_table_rows) >= self.min_table_rows:
|
||||
tables_found.append(current_table_rows)
|
||||
|
||||
# Convert detected tables to DocumentElements
|
||||
for table_idx, table_rows in enumerate(tables_found):
|
||||
if not table_rows:
|
||||
continue
|
||||
|
||||
# Calculate table bounding box
|
||||
all_words = []
|
||||
for _, words in table_rows:
|
||||
all_words.extend(words)
|
||||
|
||||
min_x = min(w['x0'] for w in all_words)
|
||||
min_y = min(w['y0'] for w in all_words)
|
||||
max_x = max(w['x1'] for w in all_words)
|
||||
max_y = max(w['y1'] for w in all_words)
|
||||
|
||||
bbox = BoundingBox(x0=min_x, y0=min_y, x1=max_x, y1=max_y)
|
||||
|
||||
# Create table cells
|
||||
cells = []
|
||||
for row_idx, (y, words) in enumerate(table_rows):
|
||||
# Group words into columns
|
||||
columns = self._group_into_columns(words, table_rows)
|
||||
for col_idx, col_text in enumerate(columns):
|
||||
if col_text:
|
||||
cells.append(TableCell(
|
||||
row=row_idx,
|
||||
col=col_idx,
|
||||
content=col_text
|
||||
))
|
||||
|
||||
# Create table data
|
||||
table_data = TableData(
|
||||
rows=len(table_rows),
|
||||
cols=max(len(self._group_into_columns(words, table_rows))
|
||||
for _, words in table_rows),
|
||||
cells=cells
|
||||
)
|
||||
|
||||
element = DocumentElement(
|
||||
element_id=f"table_{page_num}_{counter + table_idx}",
|
||||
type=ElementType.TABLE,
|
||||
content=table_data,
|
||||
bbox=bbox,
|
||||
confidence=0.8, # Lower confidence for positional detection
|
||||
metadata={"detection_method": "positional"}
|
||||
)
|
||||
tables.append(element)
|
||||
|
||||
return tables
|
||||
|
||||
def _has_regular_spacing(self, x_positions: List[float], tolerance: float = 0.3) -> bool:
|
||||
"""Check if x positions have somewhat regular spacing"""
|
||||
if len(x_positions) < 3:
|
||||
return False
|
||||
|
||||
spacings = [x_positions[i+1] - x_positions[i] for i in range(len(x_positions)-1)]
|
||||
avg_spacing = sum(spacings) / len(spacings)
|
||||
|
||||
# Check if spacings are within tolerance of average
|
||||
for spacing in spacings:
|
||||
if abs(spacing - avg_spacing) > avg_spacing * tolerance:
|
||||
return False
|
||||
|
||||
return True
|
||||
|
||||
def _group_into_columns(self, words: List[Dict], all_rows: List) -> List[str]:
|
||||
"""Group words into columns based on x-position"""
|
||||
if not words:
|
||||
return []
|
||||
|
||||
# Find common column positions across all rows
|
||||
all_x_positions = []
|
||||
for _, row_words in all_rows:
|
||||
all_x_positions.extend([w['x0'] for w in row_words])
|
||||
|
||||
# Cluster x-positions to find columns
|
||||
column_positions = self._cluster_positions(all_x_positions)
|
||||
|
||||
# Assign words to columns
|
||||
columns = [""] * len(column_positions)
|
||||
for word in words:
|
||||
# Find closest column
|
||||
closest_col = 0
|
||||
min_dist = float('inf')
|
||||
for col_idx, col_x in enumerate(column_positions):
|
||||
dist = abs(word['x0'] - col_x)
|
||||
if dist < min_dist:
|
||||
min_dist = dist
|
||||
closest_col = col_idx
|
||||
|
||||
if columns[closest_col]:
|
||||
columns[closest_col] += " " + word['text']
|
||||
else:
|
||||
columns[closest_col] = word['text']
|
||||
|
||||
return columns
|
||||
|
||||
def _cluster_positions(self, positions: List[float], threshold: float = 20) -> List[float]:
|
||||
"""Cluster positions to find common columns"""
|
||||
if not positions:
|
||||
return []
|
||||
|
||||
sorted_pos = sorted(positions)
|
||||
clusters = [[sorted_pos[0]]]
|
||||
|
||||
for pos in sorted_pos[1:]:
|
||||
# Check if position belongs to current cluster
|
||||
if pos - clusters[-1][-1] < threshold:
|
||||
clusters[-1].append(pos)
|
||||
else:
|
||||
clusters.append([pos])
|
||||
|
||||
# Return average position of each cluster
|
||||
return [sum(cluster) / len(cluster) for cluster in clusters]
|
||||
|
||||
def _extract_images(self,
|
||||
page: fitz.Page,
|
||||
page_num: int,
|
||||
document_id: str,
|
||||
counter: int,
|
||||
output_dir: Optional[Path]) -> List[DocumentElement]:
|
||||
"""Extract images from page"""
|
||||
elements = []
|
||||
image_list = page.get_images()
|
||||
|
||||
for img_idx, img in enumerate(image_list):
|
||||
try:
|
||||
xref = img[0]
|
||||
|
||||
# Get image position(s)
|
||||
img_rects = page.get_image_rects(xref)
|
||||
if not img_rects:
|
||||
continue
|
||||
|
||||
rect = img_rects[0] # Use first occurrence
|
||||
bbox = BoundingBox(
|
||||
x0=rect.x0,
|
||||
y0=rect.y0,
|
||||
x1=rect.x1,
|
||||
y1=rect.y1
|
||||
)
|
||||
|
||||
# Extract image data
|
||||
pix = fitz.Pixmap(page.parent, xref)
|
||||
image_data = {
|
||||
"width": pix.width,
|
||||
"height": pix.height,
|
||||
"colorspace": pix.colorspace.name if pix.colorspace else "unknown",
|
||||
"xref": xref
|
||||
}
|
||||
|
||||
# Save image if output directory provided
|
||||
if output_dir:
|
||||
output_dir.mkdir(parents=True, exist_ok=True)
|
||||
image_filename = f"{document_id}_p{page_num}_img{img_idx}.png"
|
||||
image_path = output_dir / image_filename
|
||||
pix.save(str(image_path))
|
||||
image_data["saved_path"] = str(image_path)
|
||||
logger.debug(f"Saved image to {image_path}")
|
||||
|
||||
element = DocumentElement(
|
||||
element_id=f"image_{page_num}_{counter + img_idx}",
|
||||
type=ElementType.IMAGE,
|
||||
content=image_data,
|
||||
bbox=bbox,
|
||||
confidence=1.0,
|
||||
metadata={
|
||||
"image_index": img_idx,
|
||||
"xref": xref
|
||||
}
|
||||
)
|
||||
elements.append(element)
|
||||
|
||||
pix = None # Free memory
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error extracting image {img_idx}: {e}")
|
||||
|
||||
return elements
|
||||
397
backend/app/services/document_type_detector.py
Normal file
397
backend/app/services/document_type_detector.py
Normal file
@@ -0,0 +1,397 @@
|
||||
"""
|
||||
Document Type Detector Service
|
||||
|
||||
Intelligently determines the optimal processing track for documents based on
|
||||
file type, content analysis, and editability checks.
|
||||
"""
|
||||
|
||||
import os
|
||||
import logging
|
||||
import magic
|
||||
import fitz # PyMuPDF
|
||||
from pathlib import Path
|
||||
from typing import Dict, Optional, Tuple, List
|
||||
from enum import Enum
|
||||
import statistics
|
||||
|
||||
logger = logging.getLogger(__name__)
|
||||
|
||||
|
||||
class DocumentType(str, Enum):
|
||||
"""Document type classification"""
|
||||
PDF_EDITABLE = "pdf_editable" # PDF with extractable text
|
||||
PDF_SCANNED = "pdf_scanned" # PDF with images/scanned content
|
||||
PDF_MIXED = "pdf_mixed" # PDF with both text and scanned pages
|
||||
IMAGE = "image" # Image files (PNG, JPG, etc.)
|
||||
OFFICE_WORD = "office_word" # Word documents
|
||||
OFFICE_EXCEL = "office_excel" # Excel spreadsheets
|
||||
OFFICE_POWERPOINT = "office_ppt" # PowerPoint presentations
|
||||
TEXT = "text" # Plain text files
|
||||
UNKNOWN = "unknown" # Unknown format
|
||||
|
||||
|
||||
class ProcessingTrackRecommendation:
|
||||
"""Processing track recommendation with confidence"""
|
||||
|
||||
def __init__(self,
|
||||
track: str,
|
||||
confidence: float,
|
||||
reason: str,
|
||||
document_type: DocumentType,
|
||||
metadata: Optional[Dict] = None):
|
||||
self.track = track # "ocr" or "direct"
|
||||
self.confidence = confidence # 0.0 to 1.0
|
||||
self.reason = reason
|
||||
self.document_type = document_type
|
||||
self.metadata = metadata or {}
|
||||
|
||||
def to_dict(self) -> Dict:
|
||||
return {
|
||||
"recommended_track": self.track,
|
||||
"confidence": self.confidence,
|
||||
"reason": self.reason,
|
||||
"document_type": self.document_type.value,
|
||||
"metadata": self.metadata
|
||||
}
|
||||
|
||||
|
||||
class DocumentTypeDetector:
|
||||
"""
|
||||
Service for detecting document types and recommending processing tracks.
|
||||
|
||||
This service analyzes documents to determine:
|
||||
1. The document type (PDF, image, Office, etc.)
|
||||
2. Whether the document contains extractable text
|
||||
3. The recommended processing track (OCR vs Direct)
|
||||
"""
|
||||
|
||||
# MIME type mappings
|
||||
IMAGE_MIMES = {
|
||||
'image/png', 'image/jpeg', 'image/jpg', 'image/gif',
|
||||
'image/bmp', 'image/tiff', 'image/webp'
|
||||
}
|
||||
|
||||
OFFICE_MIMES = {
|
||||
'application/vnd.openxmlformats-officedocument.wordprocessingml.document': DocumentType.OFFICE_WORD,
|
||||
'application/msword': DocumentType.OFFICE_WORD,
|
||||
'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet': DocumentType.OFFICE_EXCEL,
|
||||
'application/vnd.ms-excel': DocumentType.OFFICE_EXCEL,
|
||||
'application/vnd.openxmlformats-officedocument.presentationml.presentation': DocumentType.OFFICE_POWERPOINT,
|
||||
'application/vnd.ms-powerpoint': DocumentType.OFFICE_POWERPOINT,
|
||||
}
|
||||
|
||||
def __init__(self,
|
||||
min_text_length: int = 100,
|
||||
sample_pages: int = 3,
|
||||
text_coverage_threshold: float = 0.9):
|
||||
"""
|
||||
Initialize the detector.
|
||||
|
||||
Args:
|
||||
min_text_length: Minimum text length to consider a page as having extractable text
|
||||
sample_pages: Number of pages to sample for PDF analysis
|
||||
text_coverage_threshold: Percentage of pages with text to classify as editable
|
||||
"""
|
||||
self.min_text_length = min_text_length
|
||||
self.sample_pages = sample_pages
|
||||
self.text_coverage_threshold = text_coverage_threshold
|
||||
|
||||
def detect(self, file_path: Path) -> ProcessingTrackRecommendation:
|
||||
"""
|
||||
Detect document type and recommend processing track.
|
||||
|
||||
Args:
|
||||
file_path: Path to the document file
|
||||
|
||||
Returns:
|
||||
ProcessingTrackRecommendation with track selection and metadata
|
||||
"""
|
||||
if not file_path.exists():
|
||||
logger.error(f"File not found: {file_path}")
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.5,
|
||||
reason="File not found, defaulting to OCR",
|
||||
document_type=DocumentType.UNKNOWN
|
||||
)
|
||||
|
||||
try:
|
||||
# Detect MIME type
|
||||
mime_type = magic.from_file(str(file_path), mime=True)
|
||||
logger.info(f"Detected MIME type: {mime_type} for {file_path.name}")
|
||||
|
||||
# Route based on file type
|
||||
if mime_type == 'application/pdf':
|
||||
return self._analyze_pdf(file_path)
|
||||
elif mime_type in self.IMAGE_MIMES:
|
||||
return self._analyze_image(file_path, mime_type)
|
||||
elif mime_type in self.OFFICE_MIMES:
|
||||
return self._analyze_office(file_path, mime_type)
|
||||
elif mime_type.startswith('text/'):
|
||||
return self._analyze_text(file_path, mime_type)
|
||||
else:
|
||||
logger.warning(f"Unknown MIME type: {mime_type}")
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.5,
|
||||
reason=f"Unknown file type ({mime_type}), defaulting to OCR",
|
||||
document_type=DocumentType.UNKNOWN
|
||||
)
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error detecting document type: {e}")
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.3,
|
||||
reason=f"Error during detection: {str(e)}",
|
||||
document_type=DocumentType.UNKNOWN
|
||||
)
|
||||
|
||||
def _analyze_pdf(self, file_path: Path) -> ProcessingTrackRecommendation:
|
||||
"""
|
||||
Analyze PDF to determine if it's editable or scanned.
|
||||
|
||||
Args:
|
||||
file_path: Path to PDF file
|
||||
|
||||
Returns:
|
||||
Processing track recommendation
|
||||
"""
|
||||
try:
|
||||
doc = fitz.open(str(file_path))
|
||||
total_pages = len(doc)
|
||||
|
||||
# Sample pages for analysis
|
||||
pages_to_check = min(self.sample_pages, total_pages)
|
||||
text_pages = []
|
||||
page_details = []
|
||||
|
||||
for page_num in range(pages_to_check):
|
||||
page = doc[page_num]
|
||||
|
||||
# Extract text
|
||||
text = page.get_text()
|
||||
text_length = len(text.strip())
|
||||
|
||||
# Check for images
|
||||
images = page.get_images()
|
||||
image_count = len(images)
|
||||
|
||||
# Calculate page area covered by images
|
||||
page_rect = page.rect
|
||||
page_area = page_rect.width * page_rect.height
|
||||
image_area = 0
|
||||
|
||||
for img in images:
|
||||
try:
|
||||
# Get image rectangles
|
||||
xref = img[0]
|
||||
img_rects = page.get_image_rects(xref)
|
||||
for rect in img_rects:
|
||||
image_area += rect.width * rect.height
|
||||
except:
|
||||
pass
|
||||
|
||||
image_coverage = image_area / page_area if page_area > 0 else 0
|
||||
|
||||
# Determine if page has meaningful text
|
||||
has_text = text_length >= self.min_text_length
|
||||
|
||||
text_pages.append(has_text)
|
||||
page_details.append({
|
||||
"page": page_num + 1,
|
||||
"text_length": text_length,
|
||||
"has_text": has_text,
|
||||
"image_count": image_count,
|
||||
"image_coverage": image_coverage
|
||||
})
|
||||
|
||||
logger.debug(f"Page {page_num + 1}: text_length={text_length}, "
|
||||
f"images={image_count}, image_coverage={image_coverage:.2%}")
|
||||
|
||||
doc.close()
|
||||
|
||||
# Calculate text coverage
|
||||
text_coverage = sum(text_pages) / len(text_pages) if text_pages else 0
|
||||
|
||||
# Determine document type and track
|
||||
metadata = {
|
||||
"total_pages": total_pages,
|
||||
"sampled_pages": pages_to_check,
|
||||
"text_coverage": text_coverage,
|
||||
"page_details": page_details
|
||||
}
|
||||
|
||||
if text_coverage >= self.text_coverage_threshold:
|
||||
# Mostly text-based PDF
|
||||
return ProcessingTrackRecommendation(
|
||||
track="direct",
|
||||
confidence=0.95,
|
||||
reason=f"PDF has extractable text on {text_coverage:.0%} of sampled pages",
|
||||
document_type=DocumentType.PDF_EDITABLE,
|
||||
metadata=metadata
|
||||
)
|
||||
elif text_coverage <= 0.1:
|
||||
# Mostly scanned/image PDF
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.95,
|
||||
reason=f"PDF appears to be scanned (only {text_coverage:.0%} pages have text)",
|
||||
document_type=DocumentType.PDF_SCANNED,
|
||||
metadata=metadata
|
||||
)
|
||||
else:
|
||||
# Mixed content
|
||||
# For mixed PDFs, we could implement page-level track selection in the future
|
||||
# For now, use OCR to ensure we don't miss scanned content
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.7,
|
||||
reason=f"PDF has mixed content ({text_coverage:.0%} text pages), using OCR for completeness",
|
||||
document_type=DocumentType.PDF_MIXED,
|
||||
metadata=metadata
|
||||
)
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error analyzing PDF: {e}")
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.5,
|
||||
reason=f"Error analyzing PDF: {str(e)}",
|
||||
document_type=DocumentType.PDF_SCANNED
|
||||
)
|
||||
|
||||
def _analyze_image(self, file_path: Path, mime_type: str) -> ProcessingTrackRecommendation:
|
||||
"""
|
||||
Analyze image file.
|
||||
|
||||
Images always require OCR processing.
|
||||
"""
|
||||
file_size = file_path.stat().st_size
|
||||
metadata = {
|
||||
"mime_type": mime_type,
|
||||
"file_size": file_size,
|
||||
"file_extension": file_path.suffix
|
||||
}
|
||||
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=1.0,
|
||||
reason="Image files require OCR processing",
|
||||
document_type=DocumentType.IMAGE,
|
||||
metadata=metadata
|
||||
)
|
||||
|
||||
def _analyze_office(self, file_path: Path, mime_type: str) -> ProcessingTrackRecommendation:
|
||||
"""
|
||||
Analyze Office document.
|
||||
|
||||
Currently routes all Office documents to OCR track.
|
||||
Future enhancement: implement direct extraction for Office files.
|
||||
"""
|
||||
document_type = self.OFFICE_MIMES.get(mime_type, DocumentType.UNKNOWN)
|
||||
file_size = file_path.stat().st_size
|
||||
|
||||
metadata = {
|
||||
"mime_type": mime_type,
|
||||
"file_size": file_size,
|
||||
"file_extension": file_path.suffix
|
||||
}
|
||||
|
||||
# TODO: In future, we could implement direct extraction for Office files
|
||||
# using python-docx, openpyxl, python-pptx
|
||||
return ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.9,
|
||||
reason="Office documents currently processed via OCR (direct extraction planned)",
|
||||
document_type=document_type,
|
||||
metadata=metadata
|
||||
)
|
||||
|
||||
def _analyze_text(self, file_path: Path, mime_type: str) -> ProcessingTrackRecommendation:
|
||||
"""
|
||||
Analyze text file.
|
||||
|
||||
Plain text files can be directly processed without OCR.
|
||||
"""
|
||||
file_size = file_path.stat().st_size
|
||||
metadata = {
|
||||
"mime_type": mime_type,
|
||||
"file_size": file_size,
|
||||
"file_extension": file_path.suffix
|
||||
}
|
||||
|
||||
return ProcessingTrackRecommendation(
|
||||
track="direct",
|
||||
confidence=1.0,
|
||||
reason="Plain text files can be directly processed",
|
||||
document_type=DocumentType.TEXT,
|
||||
metadata=metadata
|
||||
)
|
||||
|
||||
def analyze_batch(self, file_paths: List[Path]) -> Dict[str, ProcessingTrackRecommendation]:
|
||||
"""
|
||||
Analyze multiple files and return recommendations.
|
||||
|
||||
Args:
|
||||
file_paths: List of file paths to analyze
|
||||
|
||||
Returns:
|
||||
Dictionary mapping file paths to recommendations
|
||||
"""
|
||||
results = {}
|
||||
|
||||
for file_path in file_paths:
|
||||
try:
|
||||
recommendation = self.detect(file_path)
|
||||
results[str(file_path)] = recommendation
|
||||
logger.info(f"Analyzed {file_path.name}: {recommendation.track} "
|
||||
f"(confidence: {recommendation.confidence:.2f})")
|
||||
except Exception as e:
|
||||
logger.error(f"Error analyzing {file_path}: {e}")
|
||||
results[str(file_path)] = ProcessingTrackRecommendation(
|
||||
track="ocr",
|
||||
confidence=0.3,
|
||||
reason=f"Error during analysis: {str(e)}",
|
||||
document_type=DocumentType.UNKNOWN
|
||||
)
|
||||
|
||||
return results
|
||||
|
||||
def get_statistics(self, recommendations: Dict[str, ProcessingTrackRecommendation]) -> Dict:
|
||||
"""
|
||||
Calculate statistics from batch analysis results.
|
||||
|
||||
Args:
|
||||
recommendations: Dictionary of file recommendations
|
||||
|
||||
Returns:
|
||||
Statistics dictionary
|
||||
"""
|
||||
if not recommendations:
|
||||
return {"total": 0}
|
||||
|
||||
tracks = [r.track for r in recommendations.values()]
|
||||
confidences = [r.confidence for r in recommendations.values()]
|
||||
doc_types = [r.document_type.value for r in recommendations.values()]
|
||||
|
||||
stats = {
|
||||
"total": len(recommendations),
|
||||
"by_track": {
|
||||
"ocr": tracks.count("ocr"),
|
||||
"direct": tracks.count("direct")
|
||||
},
|
||||
"by_document_type": {},
|
||||
"confidence": {
|
||||
"mean": statistics.mean(confidences),
|
||||
"median": statistics.median(confidences),
|
||||
"min": min(confidences),
|
||||
"max": max(confidences)
|
||||
}
|
||||
}
|
||||
|
||||
# Count by document type
|
||||
for doc_type in set(doc_types):
|
||||
stats["by_document_type"][doc_type] = doc_types.count(doc_type)
|
||||
|
||||
return stats
|
||||
Reference in New Issue
Block a user