316 lines
11 KiB
Python
316 lines
11 KiB
Python
#!/usr/bin/env python3
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# SPDX-FileCopyrightText: 2022 James R. Barlow
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# SPDX-License-Identifier: MPL-2.0
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"""Validate a work order from API or command line."""
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from __future__ import annotations
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import logging
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import os
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import sys
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from collections.abc import Sequence
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from pathlib import Path
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from shutil import copyfileobj
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import pikepdf
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from ocrmypdf._defaults import DEFAULT_ROTATE_PAGES_THRESHOLD
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from ocrmypdf._exec import unpaper
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from ocrmypdf._options import OcrOptions, ProcessingMode
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from ocrmypdf._plugin_manager import OcrmypdfPluginManager
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from ocrmypdf.exceptions import (
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BadArgsError,
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InputFileError,
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MissingDependencyError,
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OutputFileAccessError,
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)
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from ocrmypdf.helpers import (
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is_file_writable,
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running_in_docker,
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running_in_snap,
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safe_symlink,
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)
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from ocrmypdf.subprocess import check_external_program
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log = logging.getLogger(__name__)
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def check_platform() -> None:
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if sys.maxsize <= 2**32: # pragma: no cover
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log.warning(
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"You are running OCRmyPDF in a 32-bit (x86) Python interpreter. "
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"This is not supported. 32-bit does not have enough address space "
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"to process large files. "
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"Please use a 64-bit (x86-64) version of Python."
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)
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def check_options_languages(
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options: OcrOptions, ocr_engine_languages: list[str]
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) -> None:
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# Check for blocked languages first, before checking if they're installed
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DENIED_LANGUAGES = {'equ', 'osd'}
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blocked = DENIED_LANGUAGES & set(options.languages)
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if blocked:
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raise BadArgsError(
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"The following languages are for Tesseract's internal use and "
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"should not be issued explicitly: "
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f"{', '.join(blocked)}\n"
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"Remove them from the -l/--language argument."
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)
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if not ocr_engine_languages:
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return
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missing_languages = set(options.languages) - set(ocr_engine_languages)
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if missing_languages:
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lang_text = '\n'.join(lang for lang in missing_languages)
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msg = (
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"OCR engine does not have language data for the following "
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"requested languages: \n"
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f"{lang_text}\n"
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"Please install the appropriate language data for your OCR engine.\n"
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"\n"
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"See the online documentation for instructions:\n"
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" https://ocrmypdf.readthedocs.io/en/latest/languages.html\n"
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"\n"
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"Note: most languages are identified by a 3-letter ISO 639-2 Code.\n"
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"For example, English is 'eng', German is 'deu', and Spanish is 'spa'.\n"
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"Simplified Chinese is 'chi_sim' and Traditional Chinese is 'chi_tra'."
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"\n"
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)
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raise MissingDependencyError(msg)
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def check_options_sidecar(options: OcrOptions) -> None:
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if options.sidecar == '\0':
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if options.output_file == '-':
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raise BadArgsError("--sidecar filename needed when output file is stdout.")
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elif options.output_file == os.devnull:
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raise BadArgsError(
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"--sidecar filename needed when output file is /dev/null or NUL."
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)
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options.sidecar = options.output_file + '.txt'
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if options.sidecar == options.input_file or options.sidecar == options.output_file:
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raise BadArgsError(
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"--sidecar file must be different from the input and output files"
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)
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def check_options_preprocessing(options: OcrOptions) -> None:
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if options.clean_final:
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options.clean = True
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if options.unpaper_args and not options.clean:
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raise BadArgsError("--clean is required for --unpaper-args")
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if (
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options.rotate_pages_threshold != DEFAULT_ROTATE_PAGES_THRESHOLD
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and not options.rotate_pages
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):
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raise BadArgsError("--rotate-pages is required for --rotate-pages-threshold")
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if options.clean:
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check_external_program(
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program='unpaper',
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package='unpaper',
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version_checker=unpaper.version,
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need_version='6.1',
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required_for="--clean, --clean-final",
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)
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def check_options_strip(options: OcrOptions) -> None:
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"""Reject options that cannot apply in strip mode.
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``--mode strip`` removes the OCR text layer in place without rasterizing or
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running OCR, so image-processing and OCR-output options have no effect.
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"""
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if options.mode != ProcessingMode.strip_text:
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return
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incompatible = {
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'--deskew': options.deskew,
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'--clean': options.clean,
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'--clean-final': options.clean_final,
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'--remove-background': options.remove_background,
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'--rotate-pages': options.rotate_pages,
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'--oversample': options.oversample,
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'--remove-vectors': options.remove_vectors,
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'--sidecar': options.sidecar,
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}
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used = sorted(name for name, value in incompatible.items() if value)
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if used:
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raise BadArgsError(
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"--mode strip removes the OCR text layer without rasterizing or "
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"running OCR, so these options have no effect and are not allowed: "
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f"{', '.join(used)}"
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)
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def _check_plugin_invariant_options(options: OcrOptions) -> None:
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check_platform()
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check_options_strip(options)
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check_options_sidecar(options)
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check_options_preprocessing(options)
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def _check_plugin_options(
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options: OcrOptions, plugin_manager: OcrmypdfPluginManager
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) -> None:
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# First, let plugins check their external dependencies
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plugin_manager.check_options(options=options)
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# Then check OCR engine language support
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ocr_engine_languages = plugin_manager.get_ocr_engine(options=options).languages(
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options
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)
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check_options_languages(options, ocr_engine_languages)
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# Finally, run comprehensive validation using the coordinator
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from ocrmypdf._validation_coordinator import ValidationCoordinator
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coordinator = ValidationCoordinator(plugin_manager)
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coordinator.validate_all_options(options)
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def check_options(options: OcrOptions, plugin_manager: OcrmypdfPluginManager) -> None:
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"""Check options for validity and consistency.
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This function coordinates validation across the entire system:
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1. Core validation (platform, files, preprocessing)
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2. Plugin external dependency validation
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3. Plugin-specific validation (handled by plugin models)
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4. Cross-cutting validation (handled by validation coordinator)
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"""
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_check_plugin_invariant_options(options)
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_check_plugin_options(options, plugin_manager)
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def create_input_file(options: OcrOptions, work_folder: Path) -> tuple[Path, str]:
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if options.input_file == '-':
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# stdin
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log.info('reading file from standard input')
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target = work_folder / 'stdin'
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with open(target, 'wb') as stream_buffer:
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copyfileobj(sys.stdin.buffer, stream_buffer)
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return target, "stdin"
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elif hasattr(options.input_file, 'readable'):
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if not options.input_file.readable():
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raise InputFileError("Input file stream is not readable")
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log.info('reading file from input stream')
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target = work_folder / 'stream'
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with open(target, 'wb') as stream_buffer:
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copyfileobj(options.input_file, stream_buffer)
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return target, "stream"
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else:
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try:
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target = work_folder / 'origin'
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safe_symlink(options.input_file, target)
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return target, os.fspath(options.input_file)
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except FileNotFoundError as e:
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msg = f"File not found - {options.input_file}"
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if running_in_docker(): # pragma: no cover
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msg += (
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"\nDocker cannot access your working directory unless you "
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"explicitly share it with the Docker container and set up "
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"permissions correctly.\n"
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"You may find it easier to use stdin/stdout:"
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"\n"
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"\tdocker run -i --rm jbarlow83/ocrmypdf - - <input.pdf >output.pdf"
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"\n"
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)
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elif running_in_snap(): # pragma: no cover
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msg += (
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"\nSnap applications cannot access files outside of "
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"your home directory unless you explicitly allow it. "
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"You may find it easier to use stdin/stdout:"
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"\n"
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"\tsnap run ocrmypdf - - <input.pdf >output.pdf"
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"\n"
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)
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raise InputFileError(msg) from e
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def check_requested_output_file(options: OcrOptions) -> None:
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if options.output_file == '-':
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if sys.stdout.isatty():
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raise BadArgsError(
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"Output was set to stdout '-' but it looks like stdout "
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"is connected to a terminal. Please redirect stdout to a "
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"file."
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)
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elif hasattr(options.output_file, 'writable'):
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if not options.output_file.writable():
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raise OutputFileAccessError("Output stream is not writable")
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elif not is_file_writable(options.output_file):
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raise OutputFileAccessError(
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f"Output file location ({options.output_file}) is not a writable file."
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)
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if (
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options.no_overwrite
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and not hasattr(options.output_file, 'writable')
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and options.output_file != '-'
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and Path(str(options.output_file)).exists()
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):
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raise OutputFileAccessError(
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f"Output file already exists: {options.output_file}\n"
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"To overwrite it, omit the --no-overwrite / -n option."
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)
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def report_output_file_size(
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options: OcrOptions,
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input_file: Path,
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output_file: Path,
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optimize_messages: Sequence[str] | None = None,
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file_overhead: int = 4000,
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page_overhead: int = 3000,
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) -> None:
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if optimize_messages is None:
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optimize_messages = []
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try:
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output_size = Path(output_file).stat().st_size
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input_size = Path(input_file).stat().st_size
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except FileNotFoundError:
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return # Outputting to stream or something
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with pikepdf.open(output_file) as p:
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# Overhead constants obtained by estimating amount of data added by OCR
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# PDF/A conversion, and possible XMP metadata addition, with compression
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reasonable_overhead = file_overhead + page_overhead * len(p.pages)
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ratio = output_size / input_size
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reasonable_ratio = output_size / (input_size + reasonable_overhead)
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if reasonable_ratio < 1.35 or input_size < 25000:
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return # Seems fine
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reasons = []
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image_preproc = {
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'deskew',
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'clean_final',
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'remove_background',
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'oversample',
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}
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for arg in image_preproc:
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if getattr(options, arg, False):
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reasons.append(
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f"--{arg.replace('_', '-')} was issued, causing transcoding."
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)
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# Check force_ocr via the backward-compatible property
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if options.force_ocr:
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reasons.append("--force-ocr (or --mode force) was issued, causing transcoding.")
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reasons.extend(optimize_messages)
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if options.output_type.startswith('pdfa'):
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reasons.append("PDF/A conversion was enabled. (Try `--output-type pdf`.)")
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if options.plugins:
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reasons.append("Plugins were used.")
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if reasons:
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explanation = "Possible reasons for this include:\n" + '\n'.join(reasons) + "\n"
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else:
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explanation = "No reason for this increase is known. Please report this issue."
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log.warning(
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f"The output file size is {ratio:.2f}× larger than the input file.\n"
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f"{explanation}"
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)
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