import importlib.util
import sys
import tempfile
import unittest
import stat
import zipfile
from pathlib import Path


REPO_ROOT = Path(__file__).resolve().parents[3]


def load_module(relative_path: str, module_name: str):
    module_path = REPO_ROOT / relative_path
    spec = importlib.util.spec_from_file_location(module_name, module_path)
    module = importlib.util.module_from_spec(spec)
    assert spec.loader is not None
    spec.loader.exec_module(module)
    return module


class OfficeUnpackSecurityTests(unittest.TestCase):
    def test_extract_archive_safely_blocks_zip_slip(self):
        for relative_path, module_name in [
            ("skills/docx-official/ooxml/scripts/unpack.py", "docx_unpack"),
            ("skills/pptx-official/ooxml/scripts/unpack.py", "pptx_unpack"),
        ]:
            module = load_module(relative_path, module_name)

            with self.subTest(module=relative_path):
                with tempfile.TemporaryDirectory() as temp_dir:
                    temp_path = Path(temp_dir)
                    archive_path = temp_path / "payload.zip"
                    output_dir = temp_path / "output"

                    with zipfile.ZipFile(archive_path, "w") as archive:
                        archive.writestr("../escape.txt", "escape")
                        archive.writestr("word/document.xml", "<w:document/>")

                    with self.assertRaises(ValueError):
                        module.extract_archive_safely(archive_path, output_dir)

                    self.assertFalse((temp_path / "escape.txt").exists())

    def test_extract_archive_safely_blocks_zip_symlinks(self):
        for relative_path, module_name in [
            ("skills/docx-official/ooxml/scripts/unpack.py", "docx_unpack_symlink"),
            ("skills/pptx-official/ooxml/scripts/unpack.py", "pptx_unpack_symlink"),
        ]:
            module = load_module(relative_path, module_name)

            with self.subTest(module=relative_path):
                with tempfile.TemporaryDirectory() as temp_dir:
                    temp_path = Path(temp_dir)
                    archive_path = temp_path / "payload.zip"
                    output_dir = temp_path / "output"

                    with zipfile.ZipFile(archive_path, "w") as archive:
                        symlink_info = zipfile.ZipInfo("word/link")
                        symlink_info.create_system = 3
                        symlink_info.external_attr = (stat.S_IFLNK | 0o777) << 16
                        archive.writestr(symlink_info, "../escape.txt")
                        archive.writestr("word/document.xml", "<w:document/>")

                    with self.assertRaises(ValueError):
                        module.extract_archive_safely(archive_path, output_dir)

                    self.assertFalse((temp_path / "escape.txt").exists())


if __name__ == "__main__":
    unittest.main()