init

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/

LICENSE

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+        DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+                    Version 2, December 2004 
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net> 
+
+ Everyone is permitted to copy and distribute verbatim or modified 
+ copies of this license document, and changing it is allowed as long 
+ as the name is changed. 
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.

README.md

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+# arcaea-apk-extract
+
+Literal meaning.
+
+## License
+
+arcaea-apk-extract is licensed under the WTFPL. You may have received a copy of the WTFPL along with arcaea-apk-extract, but whatever nobody cares that shit. Feel free to fuck anything.

andreal.py

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+import argparse
+import logging
+import re
+import sys
+import zipfile
+from pathlib import Path, PurePath
+
+from common import ArcaeaApkParser, ExtractTask, extract
+
+ROOT_OUTPUT_PATH = Path(sys.argv[0]).parent.absolute()
+
+logger = logging.getLogger(__name__)
+
+parser = argparse.ArgumentParser(
+    prog="arcaea-apk-extract for Andreal",
+    description="Literal meaning.",
+    epilog="This program is licensed under the WTFPL. Feel free to fuck anything.",
+)
+parser.add_argument("apk_file")
+parser.add_argument(
+    "-op",
+    "--output-path",
+    action="store",
+    help="output path, defaults to Path(sys.argv[0]).parent",
+)
+parser.add_argument(
+    "-v",
+    "--verbose",
+    action="store_true",
+    help="set logging level to logging.DEBUG",
+)
+
+
+class SongParser(ArcaeaApkParser):
+    @property
+    def OUTPUT_PATH(self):
+        return ROOT_OUTPUT_PATH / "Song"
+
+    def parse(self):
+        songs_dir_zf_path = zipfile.Path(self.zf) / "assets" / "songs"
+        songs_zf_path = [zfp for zfp in songs_dir_zf_path.iterdir() if zfp.is_dir()]
+
+        tasks = []
+        for song_zf_path in songs_zf_path:
+            for file_zf_path in song_zf_path.iterdir():
+                if not file_zf_path.is_file():
+                    continue
+
+                file_pure_path = PurePath(str(file_zf_path))
+
+                if file_pure_path.suffix not in [".jpg", ".png"]:
+                    continue
+
+                song_id = re.sub(r"^dl_", "", song_zf_path.name)
+                if file_pure_path.stem == "base":
+                    new_file_name_stem = song_id
+                elif file_pure_path.stem == "base_night":
+                    new_file_name_stem = f"{song_id}_night"
+                elif file_pure_path.stem in ["0", "1", "2", "3"]:
+                    new_file_name_stem = f"{song_id}_{file_pure_path.stem}"
+                else:
+                    continue
+
+                new_file_name = f"{new_file_name_stem}{file_pure_path.suffix}"
+                new_file_path = self.OUTPUT_PATH / new_file_name
+
+                tasks.append(ExtractTask(file_zf_path, new_file_path))
+        return tasks
+
+
+class CharParser(ArcaeaApkParser):
+    CHAR_RE = r"^\d*u?(_icon)?\.png$"
+
+    @property
+    def OUTPUT_PATH_CHAR(self):
+        return ROOT_OUTPUT_PATH / "Char"
+
+    @property
+    def OUTPUT_PATH_ICON(self):
+        return ROOT_OUTPUT_PATH / "Icon"
+
+    def parse(self):
+        char_dir_zf_path = zipfile.Path(self.zf) / "assets" / "char"
+        char_zf_path_list = [zfp for zfp in char_dir_zf_path.iterdir() if zfp.is_file()]
+
+        tasks = []
+        for char_zf_path in char_zf_path_list:
+            char_pure_path = PurePath(str(char_zf_path))
+            if not re.match(self.CHAR_RE, char_pure_path.name):
+                continue
+
+            if "_icon" in char_pure_path.stem:
+                new_file_name = char_pure_path.name.replace("_icon", "")
+                new_file_path = self.OUTPUT_PATH_ICON / new_file_name
+            else:
+                new_file_name = char_pure_path.name
+                new_file_path = self.OUTPUT_PATH_CHAR / new_file_name
+
+            tasks.append(ExtractTask(char_zf_path, new_file_path))
+        return tasks
+
+
+if __name__ == "__main__":
+    args = parser.parse_args(sys.argv[1:])
+
+    if args.output_path:
+        output_path = Path(args.output_path)
+        assert output_path.exists()
+        ROOT_OUTPUT_PATH = output_path
+
+    logging_level = logging.DEBUG if args.verbose else logging.INFO
+    logging.basicConfig(
+        level=logging_level,
+        style="{",
+        format="[{levelname}]{name}: {msg}",
+        stream=sys.stdout,
+        encoding="utf-8",
+    )
+
+    apk_path = Path(args.apk_file)
+    assert apk_path.exists()
+    apk_zf = zipfile.ZipFile(str(apk_path))
+
+    sp = SongParser(apk_zf)
+    cp = CharParser(apk_zf)
+
+    sp.OUTPUT_PATH.mkdir(parents=True, exist_ok=True)
+    cp.OUTPUT_PATH_CHAR.mkdir(parents=True, exist_ok=True)
+    cp.OUTPUT_PATH_ICON.mkdir(parents=True, exist_ok=True)
+
+    sp_tasks = sp.parse()
+    logger.info(f"{len(sp_tasks)} files from songs")
+    cp_tasks = cp.parse()
+    logger.info(f"{len(cp_tasks)} files from char")
+
+    tasks = sp_tasks + cp_tasks
+    logger.info("Extracting, please wait...")
+    for task in tasks:
+        extract(task)

common.py

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+import logging
+import zipfile
+from pathlib import Path, PurePath
+from typing import NamedTuple
+
+logger = logging.getLogger(__name__)
+
+
+class ExtractTask(NamedTuple):
+    old_path: zipfile.Path
+    new_path: Path | PurePath
+
+
+def extract(task: ExtractTask):
+    logger.debug(f"{task.old_path} -> {task.new_path}")
+    with task.old_path.open("rb") as src_file:
+        with Path(task.new_path).open("wb") as target_file:
+            while True:
+                if chunk := src_file.read(4096):
+                    target_file.write(chunk)
+                else:
+                    break
+
+
+class ArcaeaApkParser:
+    def __init__(self, zf: zipfile.ZipFile):
+        self.zf = zf
+
+    def parse(self) -> list[ExtractTask]:
+        raise NotImplementedError()