feat: allow searching dependencies from the command line

Author: Daniel Sanz

justfile

@@ -42,7 +42,7 @@ test-all: venv
 
 # Format all code in the project.
 format: venv
-    poetry run ruff {{ target_dirs }} --fix
+    poetry run ruff check {{ target_dirs }} --fix
 
 # Lint all code in the project.
 lint: venv

src/twyn/cli.py

@@ -1,4 +1,5 @@
 import sys
+from typing import Optional
 
 import click
 
@@ -28,6 +29,12 @@ def entry_point() -> None:
         "for supported files, but this option will override that behavior."
     ),
 )
+@click.option(
+    "--dependency",
+    type=str,
+    multiple=True,
+    help="Dependency to analyze. Cannot be set together with --dependency-file. If provided, it will take precedence over the default dependency file.",
+)
 @click.option(
     "--selector-method",
     type=click.Choice(list(SELECTOR_METHOD_MAPPING.keys())),
@@ -51,15 +58,14 @@ def entry_point() -> None:
 )
 def run(
     config: str,
-    dependency_file: str,
+    dependency_file: Optional[str],
+    dependency: tuple[str],
     selector_method: str,
     v: bool,
     vv: bool,
 ) -> int:
     if v and vv:
-        raise ValueError(
-            "Only one verbosity level is allowed. Choose either -v or -vv."
-        )
+        raise ValueError("Only one verbosity level is allowed. Choose either -v or -vv.")
 
     if v:
         verbosity = AvailableLoggingLevels.info
@@ -68,10 +74,14 @@ def run(
     else:
         verbosity = AvailableLoggingLevels.none
 
+    if dependency and dependency_file:
+        raise ValueError("Only one of --dependency or --dependency-file can be set at a time.")
+
     return int(
         check_dependencies(
             config_file=config,
             dependency_file=dependency_file,
+            dependencies_cli=set(dependency) or None,
             selector_method=selector_method,
             verbosity=verbosity,
         )

src/twyn/main.py

@@ -30,20 +30,22 @@
 
 def check_dependencies(
     config_file: Optional[str],
-    dependency_file: str,
+    dependency_file: Optional[str],
+    dependencies_cli: Optional[set[str]],
     selector_method: str,
     verbosity: AvailableLoggingLevels = AvailableLoggingLevels.none,
 ) -> bool:
     """Check if dependencies could be typosquats."""
     config = get_configuration(config_file, dependency_file, selector_method, verbosity)
+
     trusted_packages = TrustedPackages(
         names=TopPyPiReference().get_packages(),
         algorithm=EditDistance(),
         selector=get_candidate_selector(config.selector_method),
         threshold_class=SimilarityThreshold,
     )
     normalized_allowlist_packages = normalize_packages(config.allowlist)
-    dependencies = get_parsed_dependencies(config.dependency_file)
+    dependencies = dependencies_cli if dependencies_cli else get_parsed_dependencies_from_file(config.dependency_file)
     normalized_dependencies = normalize_packages(dependencies)
 
     errors: list[TyposquatCheckResult] = []
@@ -53,9 +55,7 @@ def check_dependencies(
             continue
 
         logger.info(f"Analyzing {dependency}")
-        if dependency not in trusted_packages and (
-            typosquat_results := trusted_packages.get_typosquat(dependency)
-        ):
+        if dependency not in trusted_packages and (typosquat_results := trusted_packages.get_typosquat(dependency)):
             errors.append(typosquat_results)
 
     for possible_typosquats in errors:
@@ -69,8 +69,8 @@ def check_dependencies(
 
 def get_configuration(
     config_file: Optional[str],
-    dependency_file: str,
-    selector_method: str,
+    dependency_file: Optional[str],
+    selector_method: Optional[str],
     verbosity: AvailableLoggingLevels,
 ) -> ConfigHandler:
     """Read configuration and return configuration object.
@@ -80,18 +80,14 @@ def get_configuration(
     # Read config from file
     config = ConfigHandler(file_path=config_file, enforce_file=False)
 
-    # Set logging level according to priority order
-    logging_level: AvailableLoggingLevels = get_logging_level(
+    # Set logging level
+    config.logging_level = get_logging_level(
         logging_level=verbosity,
         config_logging_level=config.logging_level,
     )
-    set_logging_level(logging_level)
-    config.logging_level = logging_level.value
-
+    set_logging_level(config.logging_level)
     # Set selector method according to priority order
-    config.selector_method = (
-        selector_method or config.selector_method or DEFAULT_SELECTOR_METHOD
-    )
+    config.selector_method = selector_method or config.selector_method or DEFAULT_SELECTOR_METHOD
 
     # Set dependency file according to priority order
     config.dependency_file = dependency_file or config.dependency_file or None
@@ -126,7 +122,7 @@ def get_candidate_selector(selector_method_name: Optional[str]) -> AbstractSelec
     return selector_method
 
 
-def get_parsed_dependencies(dependency_file: Optional[str] = None) -> set[str]:
+def get_parsed_dependencies_from_file(dependency_file: Optional[str] = None) -> set[str]:
     dependency_parser = DependencySelector(dependency_file).get_dependency_parser()
     dependencies = dependency_parser.parse()
     logger.debug("Successfully parsed local dependencies file.")

tests/main/test_cli.py

@@ -28,7 +28,7 @@ def test_allowlist_remove(self, mock_allowlist_add):
         assert mock_allowlist_add.call_args == call("requests")
 
     @patch("twyn.cli.check_dependencies")
-    def test_click_arguments(self, mock_check_dependencies):
+    def test_click_arguments_dependency_file(self, mock_check_dependencies):
         runner = CliRunner()
         runner.invoke(
             cli.run,
@@ -47,11 +47,55 @@ def test_click_arguments(self, mock_check_dependencies):
             call(
                 config_file="my-config",
                 dependency_file="requirements.txt",
+                dependencies_cli=None,
                 selector_method="first-letter",
                 verbosity=AvailableLoggingLevels.debug,
             )
         ]
 
+    @patch("twyn.cli.check_dependencies")
+    def test_click_arguments_single_dependency_cli(self, mock_check_dependencies):
+        runner = CliRunner()
+        runner.invoke(
+            cli.run,
+            [
+                "--dependency",
+                "reqests",
+            ],
+        )
+        assert mock_check_dependencies.call_args_list == [
+            call(
+                config_file=None,
+                dependency_file=None,
+                dependencies_cli={"reqests"},
+                selector_method=None,
+                verbosity=AvailableLoggingLevels.none,
+            )
+        ]
+
+    @patch("twyn.cli.check_dependencies")
+    def test_click_arguments_multiple_dependencies_cli(self, mock_check_dependencies):
+        runner = CliRunner()
+        runner.invoke(
+            cli.run,
+            [
+                "--dependency",
+                "reqests",
+                "--dependency",
+                "reqeusts",
+            ],
+        )
+
+        assert mock_check_dependencies.call_args_list == [
+            call(
+                config_file=None,
+                dependency_file=None,
+                dependencies_cli={"reqests", "reqeusts"},
+                selector_method=None,
+                verbosity=AvailableLoggingLevels.none,
+            )
+        ]
+
     @patch("twyn.cli.check_dependencies")
     def test_click_arguments_default(self, mock_check_dependencies):
         runner = CliRunner()
@@ -62,6 +106,7 @@ def test_click_arguments_default(self, mock_check_dependencies):
                 config_file=None,
                 dependency_file=None,
                 selector_method=None,
+                dependencies_cli=None,
                 verbosity=AvailableLoggingLevels.none,
             )
         ]

tests/main/test_main.py

@@ -7,7 +7,7 @@
     check_dependencies,
     get_configuration,
     get_logging_level,
-    get_parsed_dependencies,
+    get_parsed_dependencies_from_file,
 )
 
 
@@ -129,16 +129,17 @@ def test_logging_level(self, passed_logging_level, config, logging_level):
         ),
     )
     @patch("twyn.main.TopPyPiReference")
-    @patch("twyn.main.get_parsed_dependencies")
+    @patch("twyn.main.get_parsed_dependencies_from_file")
     def test_check_dependencies_detects_typosquats(
-        self, mock_get_parsed_dependencies, mock_top_pypi_reference, package_name
+        self, mock_get_parsed_dependencies_from_file, mock_top_pypi_reference, package_name
     ):
         mock_top_pypi_reference.return_value.get_packages.return_value = {"mypackage"}
-        mock_get_parsed_dependencies.return_value = {package_name}
+        mock_get_parsed_dependencies_from_file.return_value = {package_name}
 
         error = check_dependencies(
             config_file=None,
             dependency_file=None,
+            dependencies_cli=None,
             selector_method="first-letter",
         )
 
@@ -154,52 +155,86 @@ def test_check_dependencies_detects_typosquats(
         ),
     )
     @patch("twyn.main.TopPyPiReference")
-    @patch("twyn.main.get_parsed_dependencies")
+    def test_check_dependencies_with_input_from_cli_detects_typosquats(self, mock_top_pypi_reference, package_name):
+        mock_top_pypi_reference.return_value.get_packages.return_value = {"mypackage"}
+
+        error = check_dependencies(
+            config_file=None,
+            dependency_file=None,
+            dependencies_cli={package_name},
+            selector_method="first-letter",
+        )
+
+        assert error is True
+
+    @patch("twyn.main.TopPyPiReference")
+    def test_check_dependencies_with_input_from_cli_accepts_multiple_dependencies(self, mock_top_pypi_reference):
+        mock_top_pypi_reference.return_value.get_packages.return_value = {"requests", "mypackage"}
+
+        error = check_dependencies(
+            config_file=None,
+            dependency_file=None,
+            dependencies_cli={"my-package", "requests"},
+            selector_method="first-letter",
+        )
+
+        assert error is True
+
+    @pytest.mark.parametrize(
+        "package_name",
+        (
+            "my.package",
+            "my-package",
+            "my_package",
+            "My.Package",
+        ),
+    )
+    @patch("twyn.main.TopPyPiReference")
+    @patch("twyn.main.get_parsed_dependencies_from_file")
     def test_check_dependencies_ignores_package_in_allowlist(
-        self, mock_get_parsed_dependencies, mock_top_pypi_reference, package_name
+        self, mock_get_parsed_dependencies_from_file, mock_top_pypi_reference, package_name
     ):
         mock_top_pypi_reference.return_value.get_packages.return_value = {"mypackage"}
-        mock_get_parsed_dependencies.return_value = {package_name}
+        mock_get_parsed_dependencies_from_file.return_value = {package_name}
 
         m_config = Mock(
             allowlist={package_name},
             dependency_file=None,
+            dependencies_cli=None,
             selector_method="first-letter",
         )
 
         with patch("twyn.main.get_configuration", return_value=m_config):
             error = check_dependencies(
                 config_file=None,
                 dependency_file=None,
+                dependencies_cli=None,
                 selector_method="first-letter",
             )
 
         assert error is False
 
-    @pytest.mark.parametrize(
-        "package_name", ("my.package", "my-package", "my_package", "My.Package")
-    )
+    @pytest.mark.parametrize("package_name", ("my.package", "my-package", "my_package", "My.Package"))
     @patch("twyn.main.TopPyPiReference")
-    @patch("twyn.main.get_parsed_dependencies")
+    @patch("twyn.main.get_parsed_dependencies_from_file")
     def test_check_dependencies_does_not_error_on_same_package(
-        self, mock_get_parsed_dependencies, mock_top_pypi_reference, package_name
+        self, mock_get_parsed_dependencies_from_file, mock_top_pypi_reference, package_name
     ):
         mock_top_pypi_reference.return_value.get_packages.return_value = {"my-package"}
-        mock_get_parsed_dependencies.return_value = {package_name}
+        mock_get_parsed_dependencies_from_file.return_value = {package_name}
 
         error = check_dependencies(
             config_file=None,
             dependency_file=None,
+            dependencies_cli=None,
             selector_method="first-letter",
         )
 
         assert error is False
 
-    @patch(
-        "twyn.dependency_parser.dependency_selector.DependencySelector.get_dependency_parser"
-    )
+    @patch("twyn.dependency_parser.dependency_selector.DependencySelector.get_dependency_parser")
     @patch("twyn.dependency_parser.requirements_txt.RequirementsTxtParser.parse")
-    def test_get_parsed_dependencies(self, mock_parse, mock_get_dependency_parser):
+    def test_get_parsed_dependencies_from_file(self, mock_parse, mock_get_dependency_parser):
         mock_get_dependency_parser.return_value = RequirementsTxtParser()
         mock_parse.return_value = {"boto3"}
-        assert get_parsed_dependencies() == {"boto3"}
+        assert get_parsed_dependencies_from_file() == {"boto3"}