dulwich/tests/test_lfs.py

# test_lfs.py -- tests for LFS
# Copyright (C) 2020 Jelmer Vernooij <jelmer@jelmer.uk>
#
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
# Dulwich is dual-licensed under the Apache License, Version 2.0 and the GNU
# General Public License as published by the Free Software Foundation; version 2.0
# or (at your option) any later version. You can redistribute it and/or
# modify it under the terms of either of these two licenses.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# You should have received a copy of the licenses; if not, see
# <http://www.gnu.org/licenses/> for a copy of the GNU General Public License
# and <http://www.apache.org/licenses/LICENSE-2.0> for a copy of the Apache
# License, Version 2.0.
#

"""Tests for LFS support."""

import json
import os
import shutil
import tempfile
from pathlib import Path

from dulwich import porcelain
from dulwich.lfs import LFSFilterDriver, LFSPointer, LFSStore
from dulwich.repo import Repo

from . import TestCase


class LFSTests(TestCase):
    def setUp(self) -> None:
        super().setUp()
        # Suppress LFS warnings during these tests
        import logging

        self._old_level = logging.getLogger("dulwich.lfs").level
        logging.getLogger("dulwich.lfs").setLevel(logging.ERROR)
        self.test_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.test_dir)
        self.lfs = LFSStore.create(self.test_dir)

    def tearDown(self) -> None:
        # Restore original logging level
        import logging

        logging.getLogger("dulwich.lfs").setLevel(self._old_level)
        super().tearDown()

    def test_create(self) -> None:
        sha = self.lfs.write_object([b"a", b"b"])
        with self.lfs.open_object(sha) as f:
            self.assertEqual(b"ab", f.read())

    def test_missing(self) -> None:
        self.assertRaises(KeyError, self.lfs.open_object, "abcdeabcdeabcdeabcde")

    def test_write_object_empty(self) -> None:
        """Test writing an empty object."""
        sha = self.lfs.write_object([])
        with self.lfs.open_object(sha) as f:
            self.assertEqual(b"", f.read())

    def test_write_object_multiple_chunks(self) -> None:
        """Test writing an object with multiple chunks."""
        chunks = [b"chunk1", b"chunk2", b"chunk3"]
        sha = self.lfs.write_object(chunks)
        with self.lfs.open_object(sha) as f:
            self.assertEqual(b"".join(chunks), f.read())

    def test_sha_path_calculation(self) -> None:
        """Test the internal sha path calculation."""
        # The implementation splits the sha into parts for directory structure
        # Write and verify we can read it back
        sha = self.lfs.write_object([b"test data"])
        self.assertEqual(len(sha), 64)  # SHA-256 is 64 hex chars

        # Open should succeed, which verifies the path calculation works
        with self.lfs.open_object(sha) as f:
            self.assertEqual(b"test data", f.read())

    def test_create_lfs_dir(self) -> None:
        """Test creating an LFS directory when it doesn't exist."""
        import os

        # Create a temporary directory for the test
        lfs_parent_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, lfs_parent_dir)

        # Create a path for the LFS directory
        lfs_dir = os.path.join(lfs_parent_dir, "lfs")

        # Create the LFS store
        LFSStore.create(lfs_dir)

        # Verify the directories were created
        self.assertTrue(os.path.isdir(lfs_dir))
        self.assertTrue(os.path.isdir(os.path.join(lfs_dir, "tmp")))
        self.assertTrue(os.path.isdir(os.path.join(lfs_dir, "objects")))


class LFSPointerTests(TestCase):
    def test_from_bytes_valid(self) -> None:
        """Test parsing a valid LFS pointer."""
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size 0\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNotNone(pointer)
        self.assertEqual(
            pointer.oid,
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
        )
        self.assertEqual(pointer.size, 0)

    def test_from_bytes_with_extra_fields(self) -> None:
        """Test parsing LFS pointer with extra fields (should still work)."""
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size 1234\n"
            b"x-custom-field value\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNotNone(pointer)
        self.assertEqual(pointer.size, 1234)

    def test_from_bytes_invalid_version(self) -> None:
        """Test parsing with invalid version line."""
        pointer_data = (
            b"version https://invalid.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size 0\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNone(pointer)

    def test_from_bytes_missing_oid(self) -> None:
        """Test parsing with missing OID."""
        pointer_data = b"version https://git-lfs.github.com/spec/v1\nsize 0\n"
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNone(pointer)

    def test_from_bytes_missing_size(self) -> None:
        """Test parsing with missing size."""
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNone(pointer)

    def test_from_bytes_invalid_size(self) -> None:
        """Test parsing with invalid size."""
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size not_a_number\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNone(pointer)

    def test_from_bytes_binary_data(self) -> None:
        """Test parsing binary data (not an LFS pointer)."""
        binary_data = b"\x00\x01\x02\x03\x04"
        pointer = LFSPointer.from_bytes(binary_data)
        self.assertIsNone(pointer)

    def test_to_bytes(self) -> None:
        """Test converting LFS pointer to bytes."""
        pointer = LFSPointer(
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", 1234
        )
        data = pointer.to_bytes()
        expected = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size 1234\n"
        )
        self.assertEqual(data, expected)

    def test_round_trip(self) -> None:
        """Test converting to bytes and back."""
        original = LFSPointer(
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", 9876
        )
        data = original.to_bytes()
        parsed = LFSPointer.from_bytes(data)
        self.assertIsNotNone(parsed)
        self.assertEqual(parsed.oid, original.oid)
        self.assertEqual(parsed.size, original.size)

    def test_is_valid_oid(self) -> None:
        """Test OID validation."""
        # Valid SHA256
        valid_pointer = LFSPointer(
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", 0
        )
        self.assertTrue(valid_pointer.is_valid_oid())

        # Too short
        short_pointer = LFSPointer("e3b0c44298fc1c14", 0)
        self.assertFalse(short_pointer.is_valid_oid())

        # Invalid hex characters
        invalid_pointer = LFSPointer(
            "g3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", 0
        )
        self.assertFalse(invalid_pointer.is_valid_oid())


class LFSIntegrationTests(TestCase):
    """Integration tests for LFS with Git operations."""

    def setUp(self) -> None:
        super().setUp()
        # Suppress LFS warnings during these integration tests
        import logging

        self._old_level = logging.getLogger("dulwich.lfs").level
        logging.getLogger("dulwich.lfs").setLevel(logging.ERROR)

        # Create temporary directory for test repo
        self.test_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.test_dir)

        # Initialize repo
        from dulwich.repo import Repo

        self.repo = Repo.init(self.test_dir)
        self.lfs_dir = os.path.join(self.test_dir, ".git", "lfs")
        self.lfs_store = LFSStore.create(self.lfs_dir)

    def tearDown(self) -> None:
        # Restore original logging level
        import logging

        logging.getLogger("dulwich.lfs").setLevel(self._old_level)
        super().tearDown()

    def test_lfs_with_gitattributes(self) -> None:
        """Test LFS integration with .gitattributes."""
        import os

        # Create .gitattributes file
        gitattributes_path = os.path.join(self.test_dir, ".gitattributes")
        with open(gitattributes_path, "wb") as f:
            f.write(b"*.bin filter=lfs diff=lfs merge=lfs -text\n")

        # Create a binary file
        bin_path = os.path.join(self.test_dir, "large.bin")
        large_content = b"Large binary content" * 1000
        with open(bin_path, "wb") as f:
            f.write(large_content)

        # Add files to repo
        self.repo.get_worktree().stage([".gitattributes", "large.bin"])

        # Get the blob for large.bin from the index
        index = self.repo.open_index()
        entry = index[b"large.bin"]
        blob = self.repo.object_store[entry.sha]

        # With LFS configured, the blob should contain an LFS pointer
        # (Note: This would require actual LFS filter integration in dulwich)
        # For now, we just verify the structure
        self.assertIsNotNone(blob)

    def test_lfs_checkout_missing_object(self) -> None:
        """Test checkout behavior when LFS object is missing."""
        from dulwich.objects import Blob, Commit, Tree

        # Create an LFS pointer blob
        pointer = LFSPointer(
            "0000000000000000000000000000000000000000000000000000000000000000", 1234
        )
        blob = Blob()
        blob.data = pointer.to_bytes()
        self.repo.object_store.add_object(blob)

        # Create tree with the blob
        tree = Tree()
        tree.add(b"missing.bin", 0o100644, blob.id)
        self.repo.object_store.add_object(tree)

        # Create commit
        commit = Commit()
        commit.tree = tree.id
        commit.message = b"Add missing LFS file"
        commit.author = commit.committer = b"Test User <test@example.com>"
        commit.commit_time = commit.author_time = 1234567890
        commit.commit_timezone = commit.author_timezone = 0
        self.repo.object_store.add_object(commit)

        # Update HEAD
        self.repo.refs[b"HEAD"] = commit.id

        # Checkout should leave pointer file when object is missing
        # (actual checkout would require more integration)

    def test_lfs_pointer_detection(self) -> None:
        """Test detection of LFS pointer files."""
        # Test various file contents
        test_cases = [
            # Valid LFS pointer
            (
                b"version https://git-lfs.github.com/spec/v1\n"
                b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
                b"size 1234\n",
                True,
            ),
            # Regular text file
            (b"This is a regular text file\n", False),
            # Binary file
            (b"\x00\x01\x02\x03\x04", False),
            # File that starts like pointer but isn't
            (b"version 1.0\nThis is not an LFS pointer\n", False),
        ]

        for content, expected_is_pointer in test_cases:
            pointer = LFSPointer.from_bytes(content)
            self.assertEqual(
                pointer is not None,
                expected_is_pointer,
                f"Failed for content: {content!r}",
            )

    def test_builtin_lfs_clone_no_config(self) -> None:
        """Test cloning with LFS when no git-lfs commands are configured."""
        # Create source repository
        source_dir = os.path.join(self.test_dir, "source")
        os.makedirs(source_dir)
        source_repo = Repo.init(source_dir)

        # Create empty config (no LFS commands)
        config = source_repo.get_config()
        config.write_to_path()

        # Create .gitattributes with LFS filter
        gitattributes_path = os.path.join(source_dir, ".gitattributes")
        with open(gitattributes_path, "wb") as f:
            f.write(b"*.bin filter=lfs\n")

        # Create test content and store in LFS
        test_content = b"Test binary content"
        test_oid = LFSStore.from_repo(source_repo, create=True).write_object(
            [test_content]
        )

        # Create LFS pointer file
        pointer = LFSPointer(test_oid, len(test_content))
        pointer_file = os.path.join(source_dir, "test.bin")
        with open(pointer_file, "wb") as f:
            f.write(pointer.to_bytes())

        # Commit files
        porcelain.add(source_repo, paths=[".gitattributes", "test.bin"])
        porcelain.commit(source_repo, message=b"Add LFS tracked file")
        source_repo.close()

        # Clone the repository
        target_dir = os.path.join(self.test_dir, "target")
        target_repo = porcelain.clone(source_dir, target_dir)

        # Verify no LFS commands in config
        target_config = target_repo.get_config_stack()
        with self.assertRaises(KeyError):
            target_config.get((b"filter", b"lfs"), b"smudge")

        # Check the cloned file
        cloned_file = os.path.join(target_dir, "test.bin")
        with open(cloned_file, "rb") as f:
            content = f.read()

        # Should still be a pointer (LFS object not in target's store)
        self.assertTrue(
            content.startswith(b"version https://git-lfs.github.com/spec/v1")
        )
        self.assertIn(test_oid.encode(), content)
        target_repo.close()

    def test_builtin_lfs_with_local_objects(self) -> None:
        """Test built-in LFS filter when objects are available locally."""
        # No LFS config
        config = self.repo.get_config()
        config.write_to_path()

        # Create .gitattributes
        gitattributes_path = os.path.join(self.test_dir, ".gitattributes")
        with open(gitattributes_path, "wb") as f:
            f.write(b"*.dat filter=lfs\n")

        # Create LFS store and add object
        test_content = b"Hello from LFS!"
        lfs_store = LFSStore.from_repo(self.repo, create=True)
        test_oid = lfs_store.write_object([test_content])

        # Create pointer file
        pointer = LFSPointer(test_oid, len(test_content))
        pointer_file = os.path.join(self.test_dir, "data.dat")
        with open(pointer_file, "wb") as f:
            f.write(pointer.to_bytes())

        # Commit
        porcelain.add(self.repo, paths=[".gitattributes", "data.dat"])
        porcelain.commit(self.repo, message=b"Add LFS file")

        # Reset index to trigger checkout with filter
        self.repo.get_worktree().reset_index()

        # Check file content
        with open(pointer_file, "rb") as f:
            content = f.read()

        # Built-in filter should have converted pointer to actual content
        self.assertEqual(content, test_content)

    def test_builtin_lfs_filter_used(self) -> None:
        """Verify that built-in LFS filter is used when no config exists."""
        # Get filter registry
        normalizer = self.repo.get_blob_normalizer()
        filter_registry = normalizer.filter_registry
        lfs_driver = filter_registry.get_driver("lfs")

        # Should be built-in LFS filter
        self.assertIsInstance(lfs_driver, LFSFilterDriver)
        self.assertEqual(type(lfs_driver).__module__, "dulwich.lfs")


class LFSFilterDriverTests(TestCase):
    def setUp(self) -> None:
        super().setUp()
        self.test_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.test_dir)
        self.lfs_store = LFSStore.create(self.test_dir)
        self.filter_driver = LFSFilterDriver(self.lfs_store)

    def test_clean_new_file(self) -> None:
        """Test clean filter on new file content."""
        content = b"This is a test file content"
        result = self.filter_driver.clean(content)

        # Result should be an LFS pointer
        pointer = LFSPointer.from_bytes(result)
        self.assertIsNotNone(pointer)
        self.assertEqual(pointer.size, len(content))

        # Content should be stored in LFS
        with self.lfs_store.open_object(pointer.oid) as f:
            self.assertEqual(f.read(), content)

    def test_clean_existing_pointer(self) -> None:
        """Test clean filter on already-pointer content."""
        # Create a pointer
        pointer = LFSPointer(
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", 1234
        )
        pointer_data = pointer.to_bytes()

        # Clean should return the pointer unchanged
        result = self.filter_driver.clean(pointer_data)
        self.assertEqual(result, pointer_data)

    def test_smudge_valid_pointer(self) -> None:
        """Test smudge filter with valid pointer."""
        # Store some content
        content = b"This is the actual file content"
        sha = self.lfs_store.write_object([content])

        # Create pointer
        pointer = LFSPointer(sha, len(content))
        pointer_data = pointer.to_bytes()

        # Smudge should return the actual content
        result = self.filter_driver.smudge(pointer_data)
        self.assertEqual(result, content)

    def test_smudge_missing_object(self) -> None:
        """Test smudge filter with missing LFS object."""
        # Create pointer to non-existent object
        pointer = LFSPointer(
            "0000000000000000000000000000000000000000000000000000000000000000", 1234
        )
        pointer_data = pointer.to_bytes()

        # Smudge should return the pointer as-is when object is missing
        result = self.filter_driver.smudge(pointer_data)
        self.assertEqual(result, pointer_data)

    def test_smudge_non_pointer(self) -> None:
        """Test smudge filter on non-pointer content."""
        content = b"This is not an LFS pointer"

        # Smudge should return content unchanged
        result = self.filter_driver.smudge(content)
        self.assertEqual(result, content)

    def test_round_trip(self) -> None:
        """Test clean followed by smudge."""
        original_content = b"Round trip test content"

        # Clean (working tree -> repo)
        pointer_data = self.filter_driver.clean(original_content)

        # Verify it's a pointer
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNotNone(pointer)

        # Smudge (repo -> working tree)
        restored_content = self.filter_driver.smudge(pointer_data)

        # Should get back the original content
        self.assertEqual(restored_content, original_content)

    def test_clean_empty_file(self) -> None:
        """Test clean filter on empty file."""
        content = b""
        result = self.filter_driver.clean(content)

        # Result should be an LFS pointer
        pointer = LFSPointer.from_bytes(result)
        self.assertIsNotNone(pointer)
        self.assertEqual(pointer.size, 0)

        # Empty content should be stored in LFS
        with self.lfs_store.open_object(pointer.oid) as f:
            self.assertEqual(f.read(), content)

    def test_clean_large_file(self) -> None:
        """Test clean filter on large file."""
        # Create a large file (1MB)
        content = b"x" * (1024 * 1024)
        result = self.filter_driver.clean(content)

        # Result should be an LFS pointer
        pointer = LFSPointer.from_bytes(result)
        self.assertIsNotNone(pointer)
        self.assertEqual(pointer.size, len(content))

        # Content should be stored in LFS
        with self.lfs_store.open_object(pointer.oid) as f:
            self.assertEqual(f.read(), content)

    def test_smudge_corrupt_pointer(self) -> None:
        """Test smudge filter with corrupt pointer data."""
        # Create corrupt pointer data
        corrupt_data = (
            b"version https://git-lfs.github.com/spec/v1\noid sha256:invalid\n"
        )

        # Smudge should return the data as-is
        result = self.filter_driver.smudge(corrupt_data)
        self.assertEqual(result, corrupt_data)

    def test_clean_unicode_content(self) -> None:
        """Test clean filter with unicode content."""
        # UTF-8 encoded unicode content
        content = "Hello 世界 🌍".encode()
        result = self.filter_driver.clean(content)

        # Result should be an LFS pointer
        pointer = LFSPointer.from_bytes(result)
        self.assertIsNotNone(pointer)

        # Content should be preserved exactly
        with self.lfs_store.open_object(pointer.oid) as f:
            self.assertEqual(f.read(), content)


class LFSStoreEdgeCaseTests(TestCase):
    """Edge case tests for LFS store."""

    def setUp(self) -> None:
        super().setUp()
        self.test_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.test_dir)
        self.lfs = LFSStore.create(self.test_dir)

    def test_concurrent_writes(self) -> None:
        """Test that concurrent writes to same content work correctly."""
        content = b"duplicate content"

        # Write the same content multiple times
        sha1 = self.lfs.write_object([content])
        sha2 = self.lfs.write_object([content])

        # Should get the same SHA
        self.assertEqual(sha1, sha2)

        # Content should be stored only once
        with self.lfs.open_object(sha1) as f:
            self.assertEqual(f.read(), content)

    def test_write_with_generator(self) -> None:
        """Test writing object with generator chunks."""

        def chunk_generator():
            yield b"chunk1"
            yield b"chunk2"
            yield b"chunk3"

        sha = self.lfs.write_object(chunk_generator())

        # Verify content
        with self.lfs.open_object(sha) as f:
            self.assertEqual(f.read(), b"chunk1chunk2chunk3")

    def test_partial_write_rollback(self) -> None:
        """Test that partial writes don't leave artifacts."""
        import os

        # Count initial objects
        objects_dir = os.path.join(self.test_dir, "objects")
        initial_count = sum(len(files) for _, _, files in os.walk(objects_dir))

        # Try to write with a failing generator
        def failing_generator():
            yield b"chunk1"
            raise RuntimeError("Simulated error")

        # This should fail
        with self.assertRaises(RuntimeError):
            self.lfs.write_object(failing_generator())

        # No new objects should have been created
        final_count = sum(len(files) for _, _, files in os.walk(objects_dir))
        self.assertEqual(initial_count, final_count)


class LFSPointerEdgeCaseTests(TestCase):
    """Edge case tests for LFS pointer parsing."""

    def test_pointer_with_windows_line_endings(self) -> None:
        """Test parsing pointer with Windows line endings."""
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\r\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\r\n"
            b"size 1234\r\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNotNone(pointer)
        self.assertEqual(pointer.size, 1234)

    def test_pointer_with_extra_whitespace(self) -> None:
        """Test parsing pointer with extra whitespace."""
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1  \n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size 1234   \n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNotNone(pointer)
        self.assertEqual(pointer.size, 1234)

    def test_pointer_case_sensitivity(self) -> None:
        """Test that pointer parsing is case sensitive."""
        # Version line must be exact
        pointer_data = (
            b"Version https://git-lfs.github.com/spec/v1\n"  # Capital V
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size 1234\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNone(pointer)  # Should fail due to case

    def test_pointer_oid_formats(self) -> None:
        """Test different OID formats."""
        # SHA256 is currently the only supported format
        # Test SHA1 format (should fail)
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha1:356a192b7913b04c54574d18c28d46e6395428ab\n"  # SHA1
            b"size 1234\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        # This might be accepted but marked as invalid OID
        if pointer:
            self.assertFalse(pointer.is_valid_oid())

    def test_pointer_size_limits(self) -> None:
        """Test size value limits."""
        # Test with very large size
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size 999999999999999999\n"  # Very large number
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNotNone(pointer)
        self.assertEqual(pointer.size, 999999999999999999)

        # Test with negative size (should fail)
        pointer_data = (
            b"version https://git-lfs.github.com/spec/v1\n"
            b"oid sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\n"
            b"size -1\n"
        )
        pointer = LFSPointer.from_bytes(pointer_data)
        self.assertIsNone(pointer)  # Should fail with negative size


class LFSServerTests(TestCase):
    """Tests for the LFS server implementation."""

    def setUp(self) -> None:
        super().setUp()
        import threading

        from dulwich.lfs_server import run_lfs_server

        # Create temporary directory for LFS storage
        self.test_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.test_dir)

        # Start LFS server
        self.server, self.server_url = run_lfs_server(port=0, lfs_dir=self.test_dir)
        self.server_thread = threading.Thread(target=self.server.serve_forever)
        self.server_thread.daemon = True
        self.server_thread.start()

        def cleanup_server():
            self.server.shutdown()
            self.server.server_close()
            self.server_thread.join(timeout=1.0)

        self.addCleanup(cleanup_server)

    def test_server_batch_endpoint(self) -> None:
        """Test the batch endpoint directly."""
        from urllib.request import Request, urlopen

        # Create batch request
        batch_data = {
            "operation": "download",
            "transfers": ["basic"],
            "objects": [{"oid": "abc123", "size": 100}],
        }

        req = Request(
            f"{self.server_url}/objects/batch",
            data=json.dumps(batch_data).encode("utf-8"),
            headers={
                "Content-Type": "application/vnd.git-lfs+json",
                "Accept": "application/vnd.git-lfs+json",
            },
            method="POST",
        )

        with urlopen(req) as response:
            result = json.loads(response.read())

        self.assertIn("objects", result)
        self.assertEqual(len(result["objects"]), 1)
        self.assertEqual(result["objects"][0]["oid"], "abc123")
        self.assertIn("error", result["objects"][0])  # Object doesn't exist

    def test_server_upload_download(self) -> None:
        """Test uploading and downloading an object."""
        import hashlib
        from urllib.request import Request, urlopen

        test_content = b"test server content"
        test_oid = hashlib.sha256(test_content).hexdigest()

        # Get upload URL via batch
        batch_data = {
            "operation": "upload",
            "transfers": ["basic"],
            "objects": [{"oid": test_oid, "size": len(test_content)}],
        }

        req = Request(
            f"{self.server_url}/objects/batch",
            data=json.dumps(batch_data).encode("utf-8"),
            headers={
                "Content-Type": "application/vnd.git-lfs+json",
                "Accept": "application/vnd.git-lfs+json",
            },
            method="POST",
        )

        with urlopen(req) as response:
            batch_result = json.loads(response.read())

        upload_url = batch_result["objects"][0]["actions"]["upload"]["href"]

        # Upload the object
        upload_req = Request(
            upload_url,
            data=test_content,
            headers={"Content-Type": "application/octet-stream"},
            method="PUT",
        )

        with urlopen(upload_req) as response:
            self.assertEqual(response.status, 200)

        # Download the object
        download_batch_data = {
            "operation": "download",
            "transfers": ["basic"],
            "objects": [{"oid": test_oid, "size": len(test_content)}],
        }

        req = Request(
            f"{self.server_url}/objects/batch",
            data=json.dumps(download_batch_data).encode("utf-8"),
            headers={
                "Content-Type": "application/vnd.git-lfs+json",
                "Accept": "application/vnd.git-lfs+json",
            },
            method="POST",
        )

        with urlopen(req) as response:
            download_batch_result = json.loads(response.read())

        download_url = download_batch_result["objects"][0]["actions"]["download"][
            "href"
        ]

        # Download the object
        download_req = Request(download_url)

        with urlopen(download_req) as response:
            downloaded_content = response.read()

        self.assertEqual(downloaded_content, test_content)

    def test_server_verify_endpoint(self) -> None:
        """Test the verify endpoint."""
        import hashlib
        from urllib.error import HTTPError
        from urllib.request import Request, urlopen

        test_content = b"verify test"
        test_oid = hashlib.sha256(test_content).hexdigest()

        # First upload the object
        self.server.lfs_store.write_object([test_content])

        # Test verify for existing object
        verify_req = Request(
            f"{self.server_url}/objects/{test_oid}/verify",
            data=json.dumps({"oid": test_oid, "size": len(test_content)}).encode(
                "utf-8"
            ),
            headers={"Content-Type": "application/vnd.git-lfs+json"},
            method="POST",
        )

        with urlopen(verify_req) as response:
            self.assertEqual(response.status, 200)

        # Test verify for non-existent object
        fake_oid = "0" * 64
        verify_req = Request(
            f"{self.server_url}/objects/{fake_oid}/verify",
            data=json.dumps({"oid": fake_oid, "size": 100}).encode("utf-8"),
            headers={"Content-Type": "application/vnd.git-lfs+json"},
            method="POST",
        )

        with self.assertRaises(HTTPError) as cm:
            with urlopen(verify_req):
                pass
        self.assertEqual(cm.exception.code, 404)

    def test_server_invalid_endpoints(self) -> None:
        """Test invalid endpoints return 404."""
        from urllib.error import HTTPError
        from urllib.request import Request, urlopen

        # Test invalid GET endpoint
        with self.assertRaises(HTTPError) as cm:
            with urlopen(f"{self.server_url}/invalid"):
                pass
        self.assertEqual(cm.exception.code, 404)

        # Test invalid POST endpoint
        req = Request(f"{self.server_url}/invalid", data=b"test", method="POST")

        with self.assertRaises(HTTPError) as cm:
            with urlopen(req):
                pass
        self.assertEqual(cm.exception.code, 404)

    def test_server_batch_invalid_operation(self) -> None:
        """Test batch endpoint with invalid operation."""
        from urllib.error import HTTPError
        from urllib.request import Request, urlopen

        batch_data = {"operation": "invalid", "transfers": ["basic"], "objects": []}

        req = Request(
            f"{self.server_url}/objects/batch",
            data=json.dumps(batch_data).encode("utf-8"),
            headers={"Content-Type": "application/vnd.git-lfs+json"},
            method="POST",
        )

        with self.assertRaises(HTTPError) as cm:
            with urlopen(req):
                pass
        self.assertEqual(cm.exception.code, 400)

    def test_server_batch_missing_fields(self) -> None:
        """Test batch endpoint with missing required fields."""
        from urllib.request import Request, urlopen

        # Missing oid
        batch_data = {
            "operation": "download",
            "transfers": ["basic"],
            "objects": [{"size": 100}],  # Missing oid
        }

        req = Request(
            f"{self.server_url}/objects/batch",
            data=json.dumps(batch_data).encode("utf-8"),
            headers={"Content-Type": "application/vnd.git-lfs+json"},
            method="POST",
        )

        with urlopen(req) as response:
            result = json.loads(response.read())

        self.assertIn("error", result["objects"][0])
        self.assertIn("Missing oid", result["objects"][0]["error"]["message"])

    def test_server_upload_oid_mismatch(self) -> None:
        """Test upload with OID mismatch."""
        from urllib.error import HTTPError
        from urllib.request import Request, urlopen

        # Upload with wrong OID
        upload_req = Request(
            f"{self.server_url}/objects/wrongoid123",
            data=b"test content",
            headers={"Content-Type": "application/octet-stream"},
            method="PUT",
        )

        with self.assertRaises(HTTPError) as cm:
            with urlopen(upload_req):
                pass
        self.assertEqual(cm.exception.code, 400)
        self.assertIn("OID mismatch", cm.exception.read().decode())

    def test_server_download_non_existent(self) -> None:
        """Test downloading non-existent object."""
        from urllib.error import HTTPError
        from urllib.request import urlopen

        fake_oid = "0" * 64

        with self.assertRaises(HTTPError) as cm:
            with urlopen(f"{self.server_url}/objects/{fake_oid}"):
                pass
        self.assertEqual(cm.exception.code, 404)

    def test_server_invalid_json(self) -> None:
        """Test batch endpoint with invalid JSON."""
        from urllib.error import HTTPError
        from urllib.request import Request, urlopen

        req = Request(
            f"{self.server_url}/objects/batch",
            data=b"not json",
            headers={"Content-Type": "application/vnd.git-lfs+json"},
            method="POST",
        )

        with self.assertRaises(HTTPError) as cm:
            with urlopen(req):
                pass
        self.assertEqual(cm.exception.code, 400)


class LFSClientTests(TestCase):
    """Tests for LFS client network operations."""

    def setUp(self) -> None:
        super().setUp()
        import threading

        from dulwich.lfs import HTTPLFSClient
        from dulwich.lfs_server import run_lfs_server

        # Create temporary directory for LFS storage
        self.test_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.test_dir)

        # Start LFS server in a thread
        self.server, self.server_url = run_lfs_server(port=0, lfs_dir=self.test_dir)
        self.server_thread = threading.Thread(target=self.server.serve_forever)
        self.server_thread.daemon = True
        self.server_thread.start()

        def cleanup_server():
            self.server.shutdown()
            self.server.server_close()
            self.server_thread.join(timeout=1.0)

        self.addCleanup(cleanup_server)

        # Create HTTP LFS client pointing to our test server
        self.client = HTTPLFSClient(self.server_url)

    def test_client_url_normalization(self) -> None:
        """Test that client URL is normalized correctly."""
        from dulwich.lfs import LFSClient

        # Test with trailing slash
        client = LFSClient("https://example.com/repo.git/info/lfs/")
        self.assertEqual(client.url, "https://example.com/repo.git/info/lfs")

        # Test without trailing slash
        client = LFSClient("https://example.com/repo.git/info/lfs")
        self.assertEqual(client.url, "https://example.com/repo.git/info/lfs")

    def test_batch_request_format(self) -> None:
        """Test batch request formatting."""
        # Create an object in the store
        test_content = b"test content for batch"
        sha = self.server.lfs_store.write_object([test_content])

        # Request download batch
        result = self.client.batch(
            "download", [{"oid": sha, "size": len(test_content)}]
        )

        self.assertIsNotNone(result.objects)
        self.assertEqual(len(result.objects), 1)
        self.assertEqual(result.objects[0].oid, sha)
        self.assertIsNotNone(result.objects[0].actions)
        self.assertIn("download", result.objects[0].actions)

    def test_download_with_verification(self) -> None:
        """Test download with size and hash verification."""
        import hashlib

        from dulwich.lfs import LFSError

        test_content = b"test content for download"
        test_oid = hashlib.sha256(test_content).hexdigest()

        # Store the object
        sha = self.server.lfs_store.write_object([test_content])
        self.assertEqual(sha, test_oid)  # Verify SHA calculation

        # Download the object
        content = self.client.download(test_oid, len(test_content))
        self.assertEqual(content, test_content)

        # Test size mismatch
        with self.assertRaises(LFSError) as cm:
            self.client.download(test_oid, 999)  # Wrong size
        self.assertIn("size", str(cm.exception))

    def test_upload_with_verify(self) -> None:
        """Test upload with verification step."""
        import hashlib

        test_content = b"upload test content"
        test_oid = hashlib.sha256(test_content).hexdigest()
        test_size = len(test_content)

        # Upload the object
        self.client.upload(test_oid, test_size, test_content)

        # Verify it was stored
        with self.server.lfs_store.open_object(test_oid) as f:
            stored_content = f.read()
        self.assertEqual(stored_content, test_content)

    def test_upload_already_exists(self) -> None:
        """Test upload when object already exists on server."""
        import hashlib

        test_content = b"existing content"
        test_oid = hashlib.sha256(test_content).hexdigest()

        # Pre-store the object
        self.server.lfs_store.write_object([test_content])

        # Upload again - should not raise an error
        self.client.upload(test_oid, len(test_content), test_content)

        # Verify it's still there
        with self.server.lfs_store.open_object(test_oid) as f:
            self.assertEqual(f.read(), test_content)

    def test_error_handling(self) -> None:
        """Test error handling for various scenarios."""
        from urllib.error import HTTPError

        from dulwich.lfs import LFSError

        # Test downloading non-existent object
        with self.assertRaises(LFSError) as cm:
            self.client.download(
                "0000000000000000000000000000000000000000000000000000000000000000", 100
            )
        self.assertIn("Object not found", str(cm.exception))

        # Test uploading with wrong OID
        with self.assertRaises(HTTPError) as cm:
            self.client.upload("wrong_oid", 5, b"hello")
        # Server should reject due to OID mismatch
        self.assertIn("OID mismatch", str(cm.exception))

    def test_from_config_validates_lfs_url(self) -> None:
        """Test that from_config validates lfs.url and raises error for invalid URLs."""
        from dulwich.config import ConfigFile
        from dulwich.lfs import LFSClient

        # Test with invalid lfs.url - no scheme/host
        config = ConfigFile()
        config.set((b"lfs",), b"url", b"objects")
        with self.assertRaises(ValueError) as cm:
            LFSClient.from_config(config)
        self.assertIn("Invalid lfs.url", str(cm.exception))
        self.assertIn("objects", str(cm.exception))

        # Test with another malformed URL - no scheme
        config.set((b"lfs",), b"url", b"//example.com/path")
        with self.assertRaises(ValueError) as cm:
            LFSClient.from_config(config)
        self.assertIn("Invalid lfs.url", str(cm.exception))

        # Test with relative path - should be rejected (not supported by git-lfs)
        config.set((b"lfs",), b"url", b"../lfs")
        with self.assertRaises(ValueError) as cm:
            LFSClient.from_config(config)
        self.assertIn("Invalid lfs.url", str(cm.exception))

        # Test with relative path starting with ./
        config.set((b"lfs",), b"url", b"./lfs")
        with self.assertRaises(ValueError) as cm:
            LFSClient.from_config(config)
        self.assertIn("Invalid lfs.url", str(cm.exception))

        # Test with unsupported scheme - git://
        config.set((b"lfs",), b"url", b"git://example.com/repo.git")
        with self.assertRaises(ValueError) as cm:
            LFSClient.from_config(config)
        self.assertIn("Invalid lfs.url", str(cm.exception))

        # Test with unsupported scheme - ssh://
        config.set((b"lfs",), b"url", b"ssh://git@example.com/repo.git")
        with self.assertRaises(ValueError) as cm:
            LFSClient.from_config(config)
        self.assertIn("Invalid lfs.url", str(cm.exception))

        # Test with http:// but no hostname
        config.set((b"lfs",), b"url", b"http://")
        with self.assertRaises(ValueError) as cm:
            LFSClient.from_config(config)
        self.assertIn("Invalid lfs.url", str(cm.exception))

        # Test with valid https URL - should succeed
        config.set((b"lfs",), b"url", b"https://example.com/repo.git/info/lfs")
        client = LFSClient.from_config(config)
        self.assertIsNotNone(client)
        assert client is not None  # for mypy
        self.assertEqual(client.url, "https://example.com/repo.git/info/lfs")

        # Test with valid http URL - should succeed
        config.set((b"lfs",), b"url", b"http://localhost:8080/lfs")
        client = LFSClient.from_config(config)
        self.assertIsNotNone(client)
        assert client is not None  # for mypy
        self.assertEqual(client.url, "http://localhost:8080/lfs")

        # Test with valid file:// URL - should succeed
        config.set((b"lfs",), b"url", b"file:///path/to/lfs")
        client = LFSClient.from_config(config)
        self.assertIsNotNone(client)
        assert client is not None  # for mypy
        self.assertEqual(client.url, "file:///path/to/lfs")

        # Test with no lfs.url but valid remote - should derive URL
        config2 = ConfigFile()
        config2.set(
            (b"remote", b"origin"), b"url", b"https://example.com/user/repo.git"
        )
        client2 = LFSClient.from_config(config2)
        self.assertIsNotNone(client2)
        assert client2 is not None  # for mypy
        self.assertEqual(client2.url, "https://example.com/user/repo.git/info/lfs")


class FileLFSClientTests(TestCase):
    """Tests for FileLFSClient with file:// URLs."""

    def setUp(self) -> None:
        super().setUp()
        # Create temporary directory for LFS storage
        self.test_dir = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.test_dir)

        # Create LFS store and populate with test data
        from dulwich.lfs import FileLFSClient, LFSStore

        self.lfs_store = LFSStore.create(self.test_dir)
        self.test_content = b"Test file content for FileLFSClient"
        self.test_oid = self.lfs_store.write_object([self.test_content])

        # Create FileLFSClient pointing to the test directory
        # Use Path.as_uri() to create proper file:// URLs on all platforms
        file_url = Path(self.test_dir).as_uri()
        self.client = FileLFSClient(file_url)

    def test_download_existing_object(self) -> None:
        """Test downloading an existing object from file:// URL."""
        content = self.client.download(self.test_oid, len(self.test_content))
        self.assertEqual(content, self.test_content)

    def test_download_missing_object(self) -> None:
        """Test downloading a non-existent object raises LFSError."""
        from dulwich.lfs import LFSError

        fake_oid = "0" * 64
        with self.assertRaises(LFSError) as cm:
            self.client.download(fake_oid, 100)
        self.assertIn("Object not found", str(cm.exception))

    def test_download_size_mismatch(self) -> None:
        """Test download with wrong size raises LFSError."""
        from dulwich.lfs import LFSError

        with self.assertRaises(LFSError) as cm:
            self.client.download(self.test_oid, 999)  # Wrong size
        self.assertIn("Size mismatch", str(cm.exception))

    def test_upload_new_object(self) -> None:
        """Test uploading a new object to file:// URL."""
        import hashlib

        new_content = b"New content to upload"
        new_oid = hashlib.sha256(new_content).hexdigest()

        # Upload
        self.client.upload(new_oid, len(new_content), new_content)

        # Verify it was stored
        with self.lfs_store.open_object(new_oid) as f:
            stored_content = f.read()
        self.assertEqual(stored_content, new_content)

    def test_upload_size_mismatch(self) -> None:
        """Test upload with mismatched size raises LFSError."""
        from dulwich.lfs import LFSError

        content = b"test"
        oid = "0" * 64

        with self.assertRaises(LFSError) as cm:
            self.client.upload(oid, 999, content)  # Wrong size
        self.assertIn("Size mismatch", str(cm.exception))

    def test_upload_oid_mismatch(self) -> None:
        """Test upload with mismatched OID raises LFSError."""
        from dulwich.lfs import LFSError

        content = b"test"
        wrong_oid = "0" * 64  # Won't match actual SHA256

        with self.assertRaises(LFSError) as cm:
            self.client.upload(wrong_oid, len(content), content)
        self.assertIn("OID mismatch", str(cm.exception))

    def test_from_config_creates_file_client(self) -> None:
        """Test that from_config creates FileLFSClient for file:// URLs."""
        from dulwich.config import ConfigFile
        from dulwich.lfs import FileLFSClient, LFSClient

        config = ConfigFile()
        file_url = Path(self.test_dir).as_uri()
        config.set((b"lfs",), b"url", file_url.encode())

        client = LFSClient.from_config(config)
        self.assertIsInstance(client, FileLFSClient)
        assert client is not None  # for mypy
        self.assertEqual(client.url, file_url)

    def test_round_trip(self) -> None:
        """Test uploading and then downloading an object."""
        import hashlib

        content = b"Round trip test content"
        oid = hashlib.sha256(content).hexdigest()

        # Upload
        self.client.upload(oid, len(content), content)

        # Download
        downloaded = self.client.download(oid, len(content))

        self.assertEqual(downloaded, content)