mirror of
https://github.com/paperless-ngx/paperless-ngx.git
synced 2025-04-02 13:45:10 -05:00
357 lines
12 KiB
Python
357 lines
12 KiB
Python
import logging
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import re
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import tempfile
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Optional
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from django.conf import settings
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from pdf2image import convert_from_path
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from pdf2image.exceptions import PDFPageCountError
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from pikepdf import Page
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from pikepdf import Pdf
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from PIL import Image
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from documents.converters import convert_from_tiff_to_pdf
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from documents.data_models import ConsumableDocument
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from documents.plugins.base import ConsumeTaskPlugin
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from documents.plugins.base import StopConsumeTaskError
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from documents.plugins.helpers import ProgressStatusOptions
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from documents.utils import copy_basic_file_stats
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from documents.utils import copy_file_with_basic_stats
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logger = logging.getLogger("paperless.barcodes")
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@dataclass(frozen=True)
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class Barcode:
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"""
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Holds the information about a single barcode and its location in a document
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"""
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page: int
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value: str
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@property
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def is_separator(self) -> bool:
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"""
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Returns True if the barcode value equals the configured separation value,
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False otherwise
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"""
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return self.value == settings.CONSUMER_BARCODE_STRING
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@property
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def is_asn(self) -> bool:
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"""
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Returns True if the barcode value matches the configured ASN prefix,
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False otherwise
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"""
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return self.value.startswith(settings.CONSUMER_ASN_BARCODE_PREFIX)
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class BarcodePlugin(ConsumeTaskPlugin):
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NAME: str = "BarcodePlugin"
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@property
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def able_to_run(self) -> bool:
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"""
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Able to run if:
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- ASN from barcode detection is enabled or
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- Barcode support is enabled and the mime type is supported
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"""
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if settings.CONSUMER_BARCODE_TIFF_SUPPORT:
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supported_mimes = {"application/pdf", "image/tiff"}
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else:
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supported_mimes = {"application/pdf"}
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return (
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settings.CONSUMER_ENABLE_ASN_BARCODE or settings.CONSUMER_ENABLE_BARCODES
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) and self.input_doc.mime_type in supported_mimes
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def setup(self):
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self.temp_dir = tempfile.TemporaryDirectory(
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dir=self.base_tmp_dir,
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prefix="barcode",
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)
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self.pdf_file = self.input_doc.original_file
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self._tiff_conversion_done = False
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self.barcodes: list[Barcode] = []
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def run(self) -> Optional[str]:
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# Maybe do the conversion of TIFF to PDF
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self.convert_from_tiff_to_pdf()
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# Locate any barcodes in the files
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self.detect()
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# Update/overwrite an ASN if possible
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located_asn = self.asn
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if located_asn is not None:
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logger.info(f"Found ASN in barcode: {located_asn}")
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self.metadata.asn = located_asn
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separator_pages = self.get_separation_pages()
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if not separator_pages:
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return "No pages to split on!"
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# We have pages to split against
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# Note this does NOT use the base_temp_dir, as that will be removed
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tmp_dir = Path(
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tempfile.mkdtemp(
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dir=settings.SCRATCH_DIR,
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prefix="paperless-barcode-split-",
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),
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).resolve()
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from documents import tasks
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# Create the split document tasks
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for new_document in self.separate_pages(separator_pages):
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copy_file_with_basic_stats(new_document, tmp_dir / new_document.name)
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task = tasks.consume_file.delay(
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ConsumableDocument(
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# Same source, for templates
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source=self.input_doc.source,
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mailrule_id=self.input_doc.mailrule_id,
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# Can't use same folder or the consume might grab it again
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original_file=(tmp_dir / new_document.name).resolve(),
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),
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# All the same metadata
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self.metadata,
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)
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logger.info(f"Created new task {task.id} for {new_document.name}")
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# This file is now two or more files
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self.input_doc.original_file.unlink()
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msg = "Barcode splitting complete!"
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# Update the progress to complete
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self.status_mgr.send_progress(ProgressStatusOptions.SUCCESS, msg, 100, 100)
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# Request the consume task stops
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raise StopConsumeTaskError(msg)
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def cleanup(self) -> None:
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self.temp_dir.cleanup()
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def convert_from_tiff_to_pdf(self):
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"""
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May convert a TIFF image into a PDF, if the input is a TIFF and
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the TIFF has not been made into a PDF
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"""
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# Nothing to do, pdf_file is already assigned correctly
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if self.input_doc.mime_type != "image/tiff" or self._tiff_conversion_done:
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return
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self.pdf_file = convert_from_tiff_to_pdf(
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self.input_doc.original_file,
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Path(self.temp_dir.name),
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)
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self._tiff_conversion_done = True
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@staticmethod
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def read_barcodes_zxing(image: Image.Image) -> list[str]:
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barcodes = []
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import zxingcpp
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detected_barcodes = zxingcpp.read_barcodes(image)
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for barcode in detected_barcodes:
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if barcode.text:
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barcodes.append(barcode.text)
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logger.debug(
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f"Barcode of type {barcode.format} found: {barcode.text}",
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)
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return barcodes
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@staticmethod
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def read_barcodes_pyzbar(image: Image.Image) -> list[str]:
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barcodes = []
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from pyzbar import pyzbar
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# Decode the barcode image
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detected_barcodes = pyzbar.decode(image)
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# Traverse through all the detected barcodes in image
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for barcode in detected_barcodes:
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if barcode.data:
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decoded_barcode = barcode.data.decode("utf-8")
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barcodes.append(decoded_barcode)
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logger.debug(
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f"Barcode of type {barcode.type} found: {decoded_barcode}",
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)
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return barcodes
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def detect(self) -> None:
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"""
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Scan all pages of the PDF as images, updating barcodes and the pages
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found on as we go
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"""
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# Bail if barcodes already exist
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if self.barcodes:
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return
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# No op if not a TIFF
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self.convert_from_tiff_to_pdf()
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# Choose the library for reading
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if settings.CONSUMER_BARCODE_SCANNER == "PYZBAR":
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reader = self.read_barcodes_pyzbar
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logger.debug("Scanning for barcodes using PYZBAR")
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else:
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reader = self.read_barcodes_zxing
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logger.debug("Scanning for barcodes using ZXING")
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try:
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pages_from_path = convert_from_path(
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self.pdf_file,
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dpi=settings.CONSUMER_BARCODE_DPI,
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output_folder=self.temp_dir.name,
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)
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for current_page_number, page in enumerate(pages_from_path):
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factor = settings.CONSUMER_BARCODE_UPSCALE
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if factor > 1.0:
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logger.debug(
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f"Upscaling image by {factor} for better barcode detection",
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)
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x, y = page.size
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page = page.resize(
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(int(round(x * factor)), (int(round(y * factor)))),
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)
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for barcode_value in reader(page):
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self.barcodes.append(
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Barcode(current_page_number, barcode_value),
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)
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# Password protected files can't be checked
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# This is the exception raised for those
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except PDFPageCountError as e:
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logger.warning(
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f"File is likely password protected, not checking for barcodes: {e}",
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)
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# This file is really borked, allow the consumption to continue
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# but it may fail further on
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except Exception as e: # pragma: no cover
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logger.warning(
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f"Exception during barcode scanning: {e}",
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)
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@property
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def asn(self) -> Optional[int]:
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"""
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Search the parsed barcodes for any ASNs.
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The first barcode that starts with CONSUMER_ASN_BARCODE_PREFIX
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is considered the ASN to be used.
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Returns the detected ASN (or None)
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"""
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asn = None
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# Ensure the barcodes have been read
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self.detect()
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# get the first barcode that starts with CONSUMER_ASN_BARCODE_PREFIX
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asn_text = next(
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(x.value for x in self.barcodes if x.is_asn),
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None,
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)
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if asn_text:
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logger.debug(f"Found ASN Barcode: {asn_text}")
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# remove the prefix and remove whitespace
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asn_text = asn_text[len(settings.CONSUMER_ASN_BARCODE_PREFIX) :].strip()
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# remove non-numeric parts of the remaining string
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asn_text = re.sub(r"\D", "", asn_text)
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# now, try parsing the ASN number
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try:
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asn = int(asn_text)
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except ValueError as e:
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logger.warning(f"Failed to parse ASN number because: {e}")
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return asn
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def get_separation_pages(self) -> dict[int, bool]:
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"""
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Search the parsed barcodes for separators and returns a dict of page
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numbers, which separate the file into new files, together with the
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information whether to keep the page.
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"""
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# filter all barcodes for the separator string
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# get the page numbers of the separating barcodes
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separator_pages = {bc.page: False for bc in self.barcodes if bc.is_separator}
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if not settings.CONSUMER_ENABLE_ASN_BARCODE:
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return separator_pages
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# add the page numbers of the ASN barcodes
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# (except for first page, that might lead to infinite loops).
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return {
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**separator_pages,
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**{bc.page: True for bc in self.barcodes if bc.is_asn and bc.page != 0},
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}
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def separate_pages(self, pages_to_split_on: dict[int, bool]) -> list[Path]:
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"""
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Separate the provided pdf file on the pages_to_split_on.
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The pages which are defined by the keys in page_numbers
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will be removed if the corresponding value is false.
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Returns a list of (temporary) filepaths to consume.
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These will need to be deleted later.
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"""
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document_paths = []
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fname = self.input_doc.original_file.stem
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with Pdf.open(self.pdf_file) as input_pdf:
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# Start with an empty document
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current_document: list[Page] = []
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# A list of documents, ie a list of lists of pages
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documents: list[list[Page]] = [current_document]
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for idx, page in enumerate(input_pdf.pages):
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# Keep building the new PDF as long as it is not a
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# separator index
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if idx not in pages_to_split_on:
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current_document.append(page)
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continue
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# This is a split index
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# Start a new destination page listing
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logger.debug(f"Starting new document at idx {idx}")
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current_document = []
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documents.append(current_document)
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keep_page = pages_to_split_on[idx]
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if keep_page:
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# Keep the page
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# (new document is started by asn barcode)
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current_document.append(page)
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documents = [x for x in documents if len(x)]
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logger.debug(f"Split into {len(documents)} new documents")
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# Write the new documents out
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for doc_idx, document in enumerate(documents):
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dst = Pdf.new()
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dst.pages.extend(document)
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output_filename = f"{fname}_document_{doc_idx}.pdf"
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logger.debug(f"pdf no:{doc_idx} has {len(dst.pages)} pages")
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savepath = Path(self.temp_dir.name) / output_filename
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with open(savepath, "wb") as out:
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dst.save(out)
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copy_basic_file_stats(self.input_doc.original_file, savepath)
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document_paths.append(savepath)
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return document_paths
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