Fix resolving requirements with percent encoded characters

`Distribution.from_link()` derives the version string of a package from
the given (percent encoded) `Link.url`. That derivation lacks the
decoding, so the resulting version string may also contain percent
encoded characters in which case the dependency resolution fails.

Fix the resolution by URL adding the missing unquoting.

Fixes #143.

Signed-off-by: Frank Viernau <[email protected]>

src/python_inspector/utils_pypi.py

@@ -20,6 +20,7 @@
 from typing import List
 from typing import NamedTuple
 from urllib.parse import quote_plus
+from urllib.parse import unquote
 from urllib.parse import urlparse
 from urllib.parse import urlunparse
 
@@ -675,7 +676,7 @@ def from_link(cls, link: Link):
         """
         requires_python = link.python_requires
         path_or_url = link.url
-        filename = os.path.basename(path_or_url.strip("/"))
+        filename = os.path.basename(unquote(path_or_url).strip("/"))
         dist = cls.from_filename(filename)
         dist.path_or_url = path_or_url
         dist.python_requires = requires_python

tests/test_resolution.py

@@ -26,6 +26,7 @@
 from python_inspector.resolution import parse_reqs_from_setup_py_insecurely
 from python_inspector.utils_pypi import PYPI_PUBLIC_REPO
 from python_inspector.utils_pypi import Environment
+from python_inspector.utils_pypi import PypiSimpleRepository
 
 setup_test_env = FileDrivenTesting()
 setup_test_env.test_data_dir = os.path.join(os.path.dirname(__file__), "data")
@@ -130,6 +131,34 @@ def test_get_resolved_dependencies_with_tilde_requirement_using_json_api():
     ]
 
 
+@pytest.mark.online
+def test_get_resolved_dependencies_with_url_encoded_char_plus():
+    req = Requirement("torch==2.0.0+cpu")
+    req.is_requirement_resolved = True
+    _, plist = get_resolved_dependencies(
+        requirements=[req],
+        environment=Environment(
+            python_version="310",
+            operating_system="linux",
+        ),
+        repos=[
+            PypiSimpleRepository(index_url="https://download.pytorch.org/whl/cpu", credentials=None)
+        ],
+        as_tree=False,
+    )
+
+    assert plist == [
+        "pkg:pypi/[email protected]",
+        "pkg:pypi/[email protected]",
+        "pkg:pypi/[email protected]",
+        "pkg:pypi/[email protected]",
+        "pkg:pypi/[email protected]",
+        "pkg:pypi/[email protected]",
+        "pkg:pypi/[email protected]%2Bcpu",
+        "pkg:pypi/[email protected]",
+    ]
+
+
 @pytest.mark.online
 def test_without_supported_wheels():
     req = Requirement("autobahn==22.3.2")