mirror of
https://github.com/paperless-ngx/paperless-ngx.git
synced 2025-05-05 11:39:29 -05:00
223 lines
6.8 KiB
Python
223 lines
6.8 KiB
Python
import logging
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import os
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import re
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import shutil
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import subprocess
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import tempfile
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import dateparser
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import magic
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from django.conf import settings
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from django.utils import timezone
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# This regular expression will try to find dates in the document at
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# hand and will match the following formats:
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# - XX.YY.ZZZZ with XX + YY being 1 or 2 and ZZZZ being 2 or 4 digits
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# - XX/YY/ZZZZ with XX + YY being 1 or 2 and ZZZZ being 2 or 4 digits
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# - XX-YY-ZZZZ with XX + YY being 1 or 2 and ZZZZ being 2 or 4 digits
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# - ZZZZ.XX.YY with XX + YY being 1 or 2 and ZZZZ being 2 or 4 digits
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# - ZZZZ/XX/YY with XX + YY being 1 or 2 and ZZZZ being 2 or 4 digits
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# - ZZZZ-XX-YY with XX + YY being 1 or 2 and ZZZZ being 2 or 4 digits
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# - XX. MONTH ZZZZ with XX being 1 or 2 and ZZZZ being 2 or 4 digits
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# - MONTH ZZZZ, with ZZZZ being 4 digits
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# - MONTH XX, ZZZZ with XX being 1 or 2 and ZZZZ being 4 digits
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from documents.loggers import LoggingMixin
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from documents.signals import document_consumer_declaration
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# TODO: isnt there a date parsing library for this?
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DATE_REGEX = re.compile(
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r'(\b|(?!=([_-])))([0-9]{1,2})[\.\/-]([0-9]{1,2})[\.\/-]([0-9]{4}|[0-9]{2})(\b|(?=([_-])))|' # NOQA: E501
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r'(\b|(?!=([_-])))([0-9]{4}|[0-9]{2})[\.\/-]([0-9]{1,2})[\.\/-]([0-9]{1,2})(\b|(?=([_-])))|' # NOQA: E501
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r'(\b|(?!=([_-])))([0-9]{1,2}[\. ]+[^ ]{3,9} ([0-9]{4}|[0-9]{2}))(\b|(?=([_-])))|' # NOQA: E501
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r'(\b|(?!=([_-])))([^\W\d_]{3,9} [0-9]{1,2}, ([0-9]{4}))(\b|(?=([_-])))|'
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r'(\b|(?!=([_-])))([^\W\d_]{3,9} [0-9]{4})(\b|(?=([_-])))'
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)
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logger = logging.getLogger(__name__)
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def is_mime_type_supported(mime_type):
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return get_parser_class_for_mime_type(mime_type) is not None
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def get_parser_class_for_mime_type(mime_type):
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options = []
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# Sein letzter Befehl war: KOMMT! Und sie kamen. Alle. Sogar die Parser.
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for response in document_consumer_declaration.send(None):
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parser_declaration = response[1]
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supported_mime_types = parser_declaration["mime_types"]
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if mime_type in supported_mime_types:
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options.append(parser_declaration)
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if not options:
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return None
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# Return the parser with the highest weight.
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return sorted(
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options, key=lambda _: _["weight"], reverse=True)[0]["parser"]
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def get_parser_class(path):
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"""
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Determine the appropriate parser class based on the file
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"""
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mime_type = magic.from_file(path, mime=True)
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return get_parser_class_for_mime_type(mime_type)
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def run_convert(input_file,
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output_file,
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density=None,
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scale=None,
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alpha=None,
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strip=False,
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trim=False,
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type=None,
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depth=None,
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extra=None,
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logging_group=None):
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environment = os.environ.copy()
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if settings.CONVERT_MEMORY_LIMIT:
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environment["MAGICK_MEMORY_LIMIT"] = settings.CONVERT_MEMORY_LIMIT
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if settings.CONVERT_TMPDIR:
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environment["MAGICK_TMPDIR"] = settings.CONVERT_TMPDIR
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args = [settings.CONVERT_BINARY]
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args += ['-density', str(density)] if density else []
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args += ['-scale', str(scale)] if scale else []
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args += ['-alpha', str(alpha)] if alpha else []
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args += ['-strip'] if strip else []
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args += ['-trim'] if trim else []
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args += ['-type', str(type)] if type else []
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args += ['-depth', str(depth)] if depth else []
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args += [input_file, output_file]
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logger.debug("Execute: " + " ".join(args), extra={'group': logging_group})
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if not subprocess.Popen(args, env=environment).wait() == 0:
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raise ParseError("Convert failed at {}".format(args))
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def parse_date(filename, text):
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"""
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Returns the date of the document.
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"""
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def __parser(ds, date_order):
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"""
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Call dateparser.parse with a particular date ordering
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"""
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return dateparser.parse(
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ds,
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settings={
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"DATE_ORDER": date_order,
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"PREFER_DAY_OF_MONTH": "first",
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"RETURN_AS_TIMEZONE_AWARE":
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True
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}
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)
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date = None
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next_year = timezone.now().year + 5 # Arbitrary 5 year future limit
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# if filename date parsing is enabled, search there first:
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if settings.FILENAME_DATE_ORDER:
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for m in re.finditer(DATE_REGEX, filename):
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date_string = m.group(0)
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try:
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date = __parser(date_string, settings.FILENAME_DATE_ORDER)
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except (TypeError, ValueError):
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# Skip all matches that do not parse to a proper date
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continue
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if date is not None and next_year > date.year > 1900:
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return date
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# Iterate through all regex matches in text and try to parse the date
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for m in re.finditer(DATE_REGEX, text):
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date_string = m.group(0)
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try:
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date = __parser(date_string, settings.DATE_ORDER)
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except (TypeError, ValueError):
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# Skip all matches that do not parse to a proper date
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continue
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if date is not None and next_year > date.year > 1900:
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break
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else:
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date = None
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return date
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class ParseError(Exception):
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pass
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class DocumentParser(LoggingMixin):
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"""
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Subclass this to make your own parser. Have a look at
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`paperless_tesseract.parsers` for inspiration.
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"""
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def __init__(self, logging_group):
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super().__init__()
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self.logging_group = logging_group
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self.tempdir = tempfile.mkdtemp(
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prefix="paperless-", dir=settings.SCRATCH_DIR)
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self.archive_path = None
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self.text = None
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self.date = None
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def parse(self, document_path, mime_type):
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raise NotImplementedError()
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def get_archive_path(self):
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return self.archive_path
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def get_thumbnail(self, document_path, mime_type):
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"""
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Returns the path to a file we can use as a thumbnail for this document.
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"""
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raise NotImplementedError()
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def get_optimised_thumbnail(self, document_path, mime_type):
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thumbnail = self.get_thumbnail(document_path, mime_type)
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if settings.OPTIMIZE_THUMBNAILS:
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out_path = os.path.join(self.tempdir, "thumb_optipng.png")
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args = (settings.OPTIPNG_BINARY,
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"-silent", "-o5", thumbnail, "-out", out_path)
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self.log('debug', f"Execute: {' '.join(args)}")
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if not subprocess.Popen(args).wait() == 0:
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raise ParseError("Optipng failed at {}".format(args))
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return out_path
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else:
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return thumbnail
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def get_text(self):
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return self.text
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def get_date(self):
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return self.date
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def cleanup(self):
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self.log("debug", "Deleting directory {}".format(self.tempdir))
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shutil.rmtree(self.tempdir)
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