Add Android App Bundle (.aab) file support.

Signed-off-by: ArkaprabhaChakraborty <chakrabortyarkaprabha998@gmail.com>

Author: ArkaprabhaChakraborty

src/extractcode/androidappbundle.py

@@ -0,0 +1,128 @@
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# ScanCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/nexB/extractcode for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+import logging
+import os
+import zipfile
+import attr
+
+from extractcode import ExtractErrorFailedToExtract
+
+"""
+Support to extract Android App Bundle (.aab) files.
+"""
+
+logger = logging.getLogger(__name__)
+
+TRACE = False
+
+if TRACE:
+    import sys
+    logging.basicConfig(stream=sys.stdout)
+    logger.setLevel(logging.DEBUG)
+
+
+@attr.s
+class AndroidAppBundle:
+    location = attr.ib()
+    extracted_dir = attr.ib(default=None)
+
+    @classmethod
+    def from_file(cls, location):
+        """
+        Build a new AndroidAppBundle from the file at location.
+        Raise exceptions on errors.
+        """
+        assert location
+        abs_location = os.path.abspath(os.path.expanduser(location))
+
+        if not os.path.exists(abs_location):
+            raise ExtractErrorFailedToExtract(
+                f'The system cannot find the path specified: {abs_location}')
+
+        if not is_aab(abs_location):
+            raise ExtractErrorFailedToExtract(
+                f'Unsupported file format: {abs_location}. Expected an Android App Bundle (.aab).')
+
+        return cls(location=abs_location)
+
+    def extract(self, target_dir):
+        """
+        Extract the Android App Bundle (.aab) file to the target directory.
+        Return a dictionary mapping file paths to their sizes.
+        Raise exceptions on errors.
+        """
+        assert target_dir
+        abs_target_dir = os.path.abspath(os.path.expanduser(target_dir))
+
+        if not os.path.exists(abs_target_dir) or not os.path.isdir(abs_target_dir):
+            raise ExtractErrorFailedToExtract(
+                f'The system cannot find the target directory path specified: {target_dir}')
+
+        try:
+            with zipfile.ZipFile(self.location, 'r') as zip_ref:
+                zip_ref.extractall(abs_target_dir)
+            self.extracted_dir = abs_target_dir
+
+            # Generate a file map of extracted files and their sizes
+            file_map = {}
+            for root, _, files in os.walk(abs_target_dir):
+                for file in files:
+                    file_path = os.path.join(root, file)
+                    file_size = os.path.getsize(file_path)
+                    relative_path = os.path.relpath(file_path, abs_target_dir)
+                    file_map[relative_path] = file_size
+
+            return file_map
+        except Exception as e:
+            raise ExtractErrorFailedToExtract(f'Failed to extract {self.location}: {e}')
+
+    def show_file_map(self):
+        """
+        Show the file map of extracted files and their sizes.
+        """
+        if not self.extracted_dir:
+            raise ExtractErrorFailedToExtract('No files have been extracted yet.')
+
+        # Generate the file map dynamically
+        file_map = {}
+        for root, _, files in os.walk(self.extracted_dir):
+            for file in files:
+                file_path = os.path.join(root, file)
+                file_size = os.path.getsize(file_path)
+                relative_path = os.path.relpath(file_path, self.extracted_dir)
+                file_map[relative_path] = file_size
+
+        # Print the file map
+        for file_path, file_size in file_map.items():
+            print(f'{file_path} ({file_size} bytes)')
+
+
+def is_aab(file_path):
+    """
+    Check if a file is an Android App Bundle (.aab) by checking its extension.
+    """
+    return file_path.endswith('.aab')
+
+
+def extract(location, target_dir):
+    """
+    Extract an Android App Bundle (.aab) file at ``location`` to the ``target_dir`` directory.
+    Return a dictionary mapping file paths to their sizes.
+    Raise Exception on errors.
+    """
+    assert target_dir
+    abs_target_dir = os.path.abspath(os.path.expanduser(target_dir))
+
+    if not os.path.exists(abs_target_dir) or not os.path.isdir(abs_target_dir):
+        raise ExtractErrorFailedToExtract(
+            f'The system cannot find the target directory path specified: {target_dir}')
+
+    aab = AndroidAppBundle.from_file(location)
+    return aab.extract(abs_target_dir)

tests/data/androidappbundle/app-release.aab

@@ -0,0 +1,124 @@
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# ScanCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/nexB/extractcode for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+import os
+#from pathlib import Path
+
+import pytest
+import io
+from contextlib import redirect_stdout
+
+from extractcode_assert_utils import BaseArchiveTestCase
+from extractcode_assert_utils import check_files
+
+from extractcode import androidappbundle as aab_extractor
+
+
+class TestExtractAAB(BaseArchiveTestCase):
+    test_data_dir = os.path.join(os.path.dirname(__file__), 'data')
+
+    def test_can_extract_aab_file(self):
+        # Path to the test .aab file
+        test_file = self.get_test_loc('androidappbundle/app-release.aab')
+        target_dir = self.get_temp_dir('aab_extraction')
+
+        # Extract the .aab file and get the file map
+        file_map = aab_extractor.extract(test_file, target_dir)
+
+        # Check if expected files are extracted
+        expected_files = [
+            'BUNDLE-METADATA/com.android.tools.build.libraries/dependencies.pb',
+            'base/manifest/AndroidManifest.xml',
+            'base/resources.pb',
+            'BundleConfig.pb',
+        ]
+        # Verify that all expected files are in the file map
+        for expected_file in expected_files:
+            assert expected_file in file_map, f"Expected file {expected_file} not found in the file map"
+
+        # Verify that the directories and files are physically created
+        for expected_file in expected_files:
+            # Construct the full path to the expected file
+            full_path = os.path.join(target_dir, expected_file)
+            # Check if the file exists
+            assert os.path.exists(full_path), f"Expected file {full_path} does not exist"
+            # Check if it is a file (not a directory)
+            assert os.path.isfile(full_path), f"Expected file {full_path} is not a file"
+
+        # Verify that the directories are created
+        expected_directories = [
+            'BUNDLE-METADATA',
+            'BUNDLE-METADATA/com.android.tools.build.libraries',
+            'base',
+            'base/manifest',
+        ]
+
+        for expected_dir in expected_directories:
+            # Construct the full path to the expected directory
+            full_path = os.path.join(target_dir, expected_dir)
+            # Check if the directory exists
+            assert os.path.exists(full_path), f"Expected directory {full_path} does not exist"
+            # Check if it is a directory
+            assert os.path.isdir(full_path), f"Expected directory {full_path} is not a directory"
+
+    def test_can_identify_aab_file(self):
+        # Path to the test .aab file
+        test_file = self.get_test_loc('androidappbundle/app-release.aab')
+
+        # Check if the file is identified as an .aab file
+        assert aab_extractor.is_aab(test_file) == True
+
+    def test_extract_aab_invalid_file(self):
+        # Create an invalid .aab file (not a zip file)
+        invalid_file = os.path.join(self.get_temp_dir(), 'invalid.aab')
+        with open(invalid_file, 'w') as f:
+            f.write('This is not a valid .aab file')
+
+        target_dir = self.get_temp_dir('aab_extraction_invalid')
+
+        # Attempt to extract the invalid .aab file
+        with pytest.raises(Exception):
+            aab_extractor.extract(invalid_file, target_dir)
+
+    def test_extract_aab_nonexistent_file(self):
+        # Define a non-existent .aab file
+        nonexistent_file = "nonexistent.aab"
+        target_dir = self.get_temp_dir('aab_extraction_nonexistent')
+
+        # Attempt to extract the non-existent .aab file
+        with pytest.raises(aab_extractor.ExtractErrorFailedToExtract):
+            aab_extractor.extract(nonexistent_file, target_dir)
+
+    def test_show_file_map(self):
+        # Path to the test .aab file
+        test_file = self.get_test_loc('androidappbundle/app-release.aab')
+        target_dir = self.get_temp_dir('aab_extraction')
+
+        # Create an AndroidAppBundle instance and extract the .aab file
+        aab = aab_extractor.AndroidAppBundle.from_file(test_file)
+        file_map = aab.extract(target_dir)
+
+        # Verify that the file map is not empty
+        assert file_map, "File map should not be empty after extraction"
+
+        # Call show_file_map() and capture the output
+        output = io.StringIO()
+        with redirect_stdout(output):
+            aab.show_file_map()
+        
+        # Verify that the output contains expected files
+        output_str = output.getvalue()
+        expected_files = [
+            'BUNDLE-METADATA/com.android.tools.build.libraries/dependencies.pb',
+            'base/manifest/AndroidManifest.xml',
+            'base/resources.pb',
+            'BundleConfig.pb',
+        ]
+        for expected_file in expected_files:
+            assert expected_file in output_str, f"Expected file {expected_file} not found in the output"