414 lines
16 KiB
Python
414 lines
16 KiB
Python
"""A class to represent a single comic, be it file or folder of images"""
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# Copyright 2012-2014 ComicTagger Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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import importlib.util
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import io
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import itertools
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import logging
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import os
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import pathlib
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import shutil
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import sys
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import traceback
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from collections.abc import Sequence
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from typing import TYPE_CHECKING
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from comicapi import utils
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from comicapi.archivers import Archiver, UnknownArchiver, ZipArchiver
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from comicapi.genericmetadata import GenericMetadata
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from comicapi.metadata import Metadata
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from comictaggerlib.ctversion import version
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if TYPE_CHECKING:
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from importlib.machinery import ModuleSpec
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from importlib.metadata import EntryPoint
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logger = logging.getLogger(__name__)
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archivers: list[type[Archiver]] = []
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metadata_styles: dict[str, Metadata] = {}
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def load_archive_plugins(local_plugins: Sequence[EntryPoint] = tuple()) -> None:
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if not archivers:
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if sys.version_info < (3, 10):
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from importlib_metadata import entry_points
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else:
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from importlib.metadata import entry_points
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builtin: list[type[Archiver]] = []
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# A list is used first matching plugin wins
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for ep in itertools.chain(local_plugins, entry_points(group="comicapi.archiver")):
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try:
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archiver: type[Archiver] = ep.load()
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if ep.module.startswith("comicapi"):
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builtin.append(archiver)
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else:
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archivers.append(archiver)
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except Exception:
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try:
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spec = importlib.util.find_spec(ep.module)
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except ValueError:
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spec = None
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if spec and spec.has_location:
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logger.exception("Failed to load archive plugin: %s from %s", ep.name, spec.origin)
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else:
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logger.exception("Failed to load archive plugin: %s", ep.name)
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archivers.extend(builtin)
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def load_metadata_plugins(version: str = f"ComicAPI/{version}", local_plugins: Sequence[EntryPoint] = tuple()) -> None:
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if not metadata_styles:
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if sys.version_info < (3, 10):
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from importlib_metadata import entry_points
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else:
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from importlib.metadata import entry_points
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builtin: dict[str, Metadata] = {}
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styles: dict[str, tuple[Metadata, ModuleSpec | None]] = {}
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# A dict is used, last plugin wins
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for ep in itertools.chain(entry_points(group="comicapi.metadata"), local_plugins):
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try:
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spec = importlib.util.find_spec(ep.module)
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except ValueError:
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spec = None
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try:
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style: type[Metadata] = ep.load()
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if style.enabled:
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if ep.module.startswith("comicapi"):
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builtin[style.short_name] = style(version)
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else:
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if style.short_name in styles:
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if spec and spec.has_location:
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logger.warning(
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"Plugin %s from %s is overriding the existing metadata plugin for %s tags",
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ep.module,
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spec.origin,
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style.short_name,
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)
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else:
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logger.warning(
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"Plugin %s is overriding the existing metadata plugin for %s tags",
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ep.module,
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style.short_name,
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)
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styles[style.short_name] = (style(version), spec)
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except Exception:
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if spec and spec.has_location:
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logger.exception("Failed to load metadata plugin: %s from %s", ep.name, spec.origin)
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else:
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logger.exception("Failed to load metadata plugin: %s", ep.name)
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for style_name in set(builtin.keys()).intersection(styles):
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spec = styles[style_name][1]
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if spec and spec.has_location:
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logger.warning(
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"Builtin metadata for %s tags are being overridden by a plugin from %s", style_name, spec.origin
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)
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else:
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logger.warning("Builtin metadata for %s tags are being overridden by a plugin", style_name)
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metadata_styles.clear()
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metadata_styles.update(builtin)
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metadata_styles.update({s[0]: s[1][0] for s in styles.items()})
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class ComicArchive:
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logo_data = b""
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pil_available = True
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def __init__(
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self, path: pathlib.Path | str | Archiver, default_image_path: pathlib.Path | str | None = None
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) -> None:
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self.md: dict[str, GenericMetadata] = {}
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self.page_count: int | None = None
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self.page_list: list[str] = []
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self.reset_cache()
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self.default_image_path = default_image_path
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if isinstance(path, Archiver):
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self.path = path.path
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self.archiver: Archiver = path
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else:
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self.path = pathlib.Path(path).absolute()
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self.archiver = UnknownArchiver.open(self.path)
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load_archive_plugins()
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load_metadata_plugins()
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for archiver in archivers:
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if archiver.enabled and archiver.is_valid(self.path):
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self.archiver = archiver.open(self.path)
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break
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if not ComicArchive.logo_data and self.default_image_path:
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with open(self.default_image_path, mode="rb") as fd:
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ComicArchive.logo_data = fd.read()
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def reset_cache(self) -> None:
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"""Clears the cached data"""
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self.page_count = None
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self.page_list.clear()
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self.md.clear()
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def load_cache(self, style_list: list[str]) -> None:
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for style in style_list:
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if style in metadata_styles:
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md = metadata_styles[style].get_metadata(self.archiver)
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if not md.is_empty:
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self.md[style] = md
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def get_supported_metadata(self) -> list[str]:
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return [style[0] for style in metadata_styles.items() if style[1].supports_metadata(self.archiver)]
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def rename(self, path: pathlib.Path | str) -> None:
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new_path = pathlib.Path(path).absolute()
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if new_path == self.path:
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return
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os.makedirs(new_path.parent, 0o777, True)
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shutil.move(self.path, new_path)
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self.path = new_path
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self.archiver.path = pathlib.Path(path)
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def is_writable(self, check_archive_status: bool = True) -> bool:
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if isinstance(self.archiver, UnknownArchiver):
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return False
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if check_archive_status and not self.archiver.is_writable():
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return False
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if not (os.access(self.path, os.W_OK) or os.access(self.path.parent, os.W_OK)):
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return False
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return True
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def is_writable_for_style(self, style: str) -> bool:
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if style in metadata_styles:
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return self.archiver.is_writable() and metadata_styles[style].supports_metadata(self.archiver)
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return False
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def is_zip(self) -> bool:
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return self.archiver.name() == "ZIP"
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def seems_to_be_a_comic_archive(self) -> bool:
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if not (isinstance(self.archiver, UnknownArchiver)) and self.get_number_of_pages() > 0:
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return True
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return False
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def extension(self) -> str:
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return self.archiver.extension()
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def read_metadata(self, style: str) -> GenericMetadata:
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if style in self.md:
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return self.md[style]
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md = GenericMetadata()
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if metadata_styles[style].has_metadata(self.archiver):
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md = metadata_styles[style].get_metadata(self.archiver)
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md.apply_default_page_list(self.get_page_name_list())
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return md
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def read_metadata_string(self, style: str) -> str:
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return metadata_styles[style].get_metadata_string(self.archiver)
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def write_metadata(self, metadata: GenericMetadata, style: str) -> bool:
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if style in self.md:
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del self.md[style]
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metadata.apply_default_page_list(self.get_page_name_list())
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return metadata_styles[style].set_metadata(metadata, self.archiver)
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def has_metadata(self, style: str) -> bool:
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if style in self.md:
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return True
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return metadata_styles[style].has_metadata(self.archiver)
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def remove_metadata(self, style: str) -> bool:
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if style in self.md:
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del self.md[style]
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return metadata_styles[style].remove_metadata(self.archiver)
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def get_page(self, index: int) -> bytes:
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image_data = b""
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filename = self.get_page_name(index)
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if filename:
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try:
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image_data = self.archiver.read_file(filename) or b""
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except Exception as e:
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tb = traceback.extract_tb(e.__traceback__)
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logger.error(
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"%s:%s: Error reading in page %d. Substituting logo page.", tb[1].filename, tb[1].lineno, index
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)
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image_data = ComicArchive.logo_data
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return image_data
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def get_page_name(self, index: int) -> str:
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if index is None:
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return ""
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page_list = self.get_page_name_list()
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num_pages = len(page_list)
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if num_pages == 0 or index >= num_pages:
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return ""
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return page_list[index]
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def get_scanner_page_index(self) -> int | None:
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scanner_page_index = None
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# make a guess at the scanner page
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name_list = self.get_page_name_list()
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count = self.get_number_of_pages()
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# too few pages to really know
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if count < 5:
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return None
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# count the length of every filename, and count occurrences
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length_buckets: dict[int, int] = {}
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for name in name_list:
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fname = os.path.split(name)[1]
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length = len(fname)
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if length in length_buckets:
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length_buckets[length] += 1
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else:
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length_buckets[length] = 1
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# sort by most common
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sorted_buckets = sorted(length_buckets.items(), key=lambda tup: (tup[1], tup[0]), reverse=True)
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# statistical mode occurrence is first
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mode_length = sorted_buckets[0][0]
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# we are only going to consider the final image file:
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final_name = os.path.split(name_list[count - 1])[1]
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common_length_list = []
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for name in name_list:
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if len(os.path.split(name)[1]) == mode_length:
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common_length_list.append(os.path.split(name)[1])
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prefix = os.path.commonprefix(common_length_list)
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if mode_length <= 7 and prefix == "":
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# probably all numbers
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if len(final_name) > mode_length:
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scanner_page_index = count - 1
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# see if the last page doesn't start with the same prefix as most others
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elif not final_name.startswith(prefix):
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scanner_page_index = count - 1
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return scanner_page_index
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def get_page_name_list(self) -> list[str]:
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if not self.page_list:
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self.page_list = utils.get_page_name_list(self.archiver.get_filename_list())
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return self.page_list
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def get_number_of_pages(self) -> int:
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if self.page_count is None:
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self.page_count = len(self.get_page_name_list())
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return self.page_count
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def apply_archive_info_to_metadata(self, md: GenericMetadata, calc_page_sizes: bool = False) -> None:
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md.page_count = self.get_number_of_pages()
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if calc_page_sizes:
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for index, p in enumerate(md.pages):
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idx = int(p["image_index"])
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p["filename"] = self.get_page_name(idx)
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if self.pil_available:
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try:
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from PIL import Image
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self.pil_available = True
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except ImportError:
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self.pil_available = False
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if "size" not in p or "height" not in p or "width" not in p:
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data = self.get_page(idx)
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if data:
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try:
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if isinstance(data, bytes):
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im = Image.open(io.BytesIO(data))
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else:
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im = Image.open(io.StringIO(data))
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w, h = im.size
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p["size"] = str(len(data))
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p["height"] = str(h)
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p["width"] = str(w)
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except Exception as e:
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logger.warning("Error decoding image [%s] %s :: image %s", e, self.path, index)
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p["size"] = str(len(data))
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else:
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if "size" not in p:
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data = self.get_page(idx)
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p["size"] = str(len(data))
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def metadata_from_filename(
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self,
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complicated_parser: bool = False,
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remove_c2c: bool = False,
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remove_fcbd: bool = False,
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remove_publisher: bool = False,
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split_words: bool = False,
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allow_issue_start_with_letter: bool = False,
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protofolius_issue_number_scheme: bool = False,
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) -> GenericMetadata:
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metadata = GenericMetadata()
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filename_info = utils.parse_filename(
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self.path.name,
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complicated_parser=complicated_parser,
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remove_c2c=remove_c2c,
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remove_fcbd=remove_fcbd,
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remove_publisher=remove_publisher,
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split_words=split_words,
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allow_issue_start_with_letter=allow_issue_start_with_letter,
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protofolius_issue_number_scheme=protofolius_issue_number_scheme,
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)
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metadata.alternate_number = utils.xlate(filename_info.get("alternate", None))
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metadata.issue = utils.xlate(filename_info.get("issue", None))
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metadata.issue_count = utils.xlate_int(filename_info.get("issue_count", None))
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metadata.publisher = utils.xlate(filename_info.get("publisher", None))
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metadata.series = utils.xlate(filename_info.get("series", None))
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metadata.title = utils.xlate(filename_info.get("title", None))
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metadata.volume = utils.xlate_int(filename_info.get("volume", None))
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metadata.volume_count = utils.xlate_int(filename_info.get("volume_count", None))
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metadata.year = utils.xlate_int(filename_info.get("year", None))
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metadata.scan_info = utils.xlate(filename_info.get("remainder", None))
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metadata.format = "FCBD" if filename_info.get("fcbd", None) else None
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if filename_info.get("annual", None):
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metadata.format = "Annual"
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if filename_info.get("format", None):
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metadata.format = filename_info["format"]
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metadata.is_empty = False
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return metadata
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def export_as_zip(self, zip_filename: pathlib.Path) -> bool:
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if self.archiver.name() == "ZIP":
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# nothing to do, we're already a zip
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return True
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zip_archiver = ZipArchiver.open(zip_filename)
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return zip_archiver.copy_from_archive(self.archiver)
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