Permit wildcards in tag validator URIs

CHANGES.rst

@@ -19,6 +19,8 @@
 - Add new extension API to support versioned extensions.
   [#850]
 
+- Permit wildcard in tag validator URIs. [#858]
+
 2.7.0 (2020-07-23)
 ------------------
 

asdf/config.py

@@ -11,6 +11,8 @@
 from . import versioning
 from ._helpers import validate_version
 from .extension import ExtensionProxy
+from . import util
+
 
 __all__ = ["AsdfConfig", "get_config", "config_context"]
 
@@ -165,7 +167,7 @@ def remove_extension(self, extension=None, *, package=None):
         Parameters
         ----------
         extension : asdf.extension.AsdfExtension or str, optional
-            An extension instance or URI to remove.
+            An extension instance or URI or URI pattern to remove.
         package : str, optional
             Remove only extensions provided by this package.  If the `extension`
             argument is omitted, then all extensions from this package will
@@ -181,7 +183,7 @@ def _remove_condition(e):
             result = True
 
             if isinstance(extension, str):
-                result = result and e.extension_uri == extension
+                result = result and util.uri_match(extension, e.extension_uri)
             elif isinstance(extension, ExtensionProxy):
                 result = result and e == extension
 

asdf/schema.py

@@ -76,18 +76,28 @@ def _type_to_tag(type_):
     return None
 
 
-def validate_tag(validator, tagname, instance, schema):
-
+def validate_tag(validator, tag_pattern, instance, schema):
+    """
+    Implements the tag validation directive, which checks the
+    tag against a pattern which may include '*' wildcards.
+    """
     if hasattr(instance, '_tag'):
         instance_tag = instance._tag
     else:
         # Try tags for known Python builtins
         instance_tag = _type_to_tag(type(instance))
 
-    if instance_tag is not None and instance_tag != tagname:
+    if instance_tag is None:
+        yield ValidationError(
+            "mismatched tags, wanted '{}', got unhandled object type '{}'".format(
+                tag_pattern, util.get_class_name(instance)
+            )
+        )
+
+    if not util.uri_match(tag_pattern, instance_tag):
         yield ValidationError(
             "mismatched tags, wanted '{0}', got '{1}'".format(
-                tagname, instance_tag))
+                tag_pattern, instance_tag))
 
 
 def validate_propertyOrder(validator, order, instance, schema):

asdf/tests/conftest.py

@@ -6,6 +6,7 @@
 from . import create_small_tree, create_large_tree
 
 from asdf import config
+from asdf import schema
 
 
 @pytest.fixture
@@ -23,3 +24,16 @@ def restore_default_config():
     yield
     config._global_config = config.AsdfConfig()
     config._local = config._ConfigLocal()
+
+
+@pytest.fixture(autouse=True)
+def clear_schema_cache():
+    """
+    Fixture that clears schema caches to prevent issues
+    when tests use same URI for different schema content.
+    """
+    yield
+    schema._load_schema.cache_clear()
+    schema._load_schema_cached.cache_clear()
+    schema.load_custom_schema.cache_clear()
+

asdf/tests/test_config.py

@@ -230,6 +230,11 @@ class BarExtension:
         config.remove_extension(uri_extension.extension_uri)
         assert len(config.extensions) == len(original_extensions)
 
+        # And also by URI pattern:
+        config.add_extension(uri_extension)
+        config.remove_extension("asdf://somewhere.org/extensions/*")
+        assert len(config.extensions) == len(original_extensions)
+
         # Remove by the name of the extension's package:
         config.add_extension(ExtensionProxy(new_extension, package_name="foo"))
         config.add_extension(ExtensionProxy(uri_extension, package_name="foo"))

asdf/tests/test_schema.py

@@ -1058,3 +1058,37 @@ def _test_validator(validator, value, instance, schema):
     )
     validator.validate(tree)
     assert len(visited_nodes) == 3
+
+
+def test_tag_validator():
+    content="""%YAML 1.1
+---
+$schema: http://stsci.edu/schemas/asdf/asdf-schema-1.0.0
+id: asdf://somewhere.org/schemas/foo
+tag: asdf://somewhere.org/tags/foo
+...
+"""
+    with asdf.config_context() as config:
+        config.add_resource_mapping({"asdf://somewhere.org/schemas/foo": content})
+
+        schema_tree = schema.load_schema("asdf://somewhere.org/schemas/foo")
+        instance = tagged.TaggedDict(tag="asdf://somewhere.org/tags/foo")
+        schema.validate(instance, schema=schema_tree)
+        with pytest.raises(ValidationError):
+            schema.validate(tagged.TaggedDict(tag="asdf://somewhere.org/tags/bar"), schema=schema_tree)
+
+    content="""%YAML 1.1
+---
+$schema: http://stsci.edu/schemas/asdf/asdf-schema-1.0.0
+id: asdf://somewhere.org/schemas/bar
+tag: asdf://somewhere.org/tags/bar-*
+...
+"""
+    with asdf.config_context() as config:
+        config.add_resource_mapping({"asdf://somewhere.org/schemas/bar": content})
+
+        schema_tree = schema.load_schema("asdf://somewhere.org/schemas/bar")
+        instance = tagged.TaggedDict(tag="asdf://somewhere.org/tags/bar-2.5")
+        schema.validate(instance, schema=schema_tree)
+        with pytest.raises(ValidationError):
+            schema.validate(tagged.TaggedDict(tag="asdf://somewhere.org/tags/foo-1.0"), schema=schema_tree)

asdf/tests/test_util.py

@@ -1,3 +1,5 @@
+import pytest
+
 from asdf import util
 from asdf.extension import BuiltinExtension
 
@@ -40,3 +42,16 @@ def test_patched_urllib_parse():
     assert urllib.parse is not util.patched_urllib_parse
     assert "asdf" not in urllib.parse.uses_relative
     assert "asdf" not in urllib.parse.uses_netloc
+
+
+@pytest.mark.parametrize("pattern, uri, result", [
+    ("asdf://somewhere.org/tags/foo-1.0", "asdf://somewhere.org/tags/foo-1.0", True),
+    ("asdf://somewhere.org/tags/foo-1.0", "asdf://somewhere.org/tags/bar-1.0", False),
+    ("asdf://somewhere.org/tags/foo-*", "asdf://somewhere.org/tags/foo-1.0", True),
+    ("asdf://somewhere.org/tags/foo-*", "asdf://somewhere.org/tags/bar-1.0", False),
+    ("asdf://*/tags/foo-*", "asdf://anywhere.org/tags/foo-4.9", True),
+    ("asdf://*/tags/foo-*", "asdf://anywhere.org/tags/bar-4.9", False),
+    ("asdf://somewhere.org/tags/foo-*", None, False),
+])
+def test_uri_match(pattern, uri, result):
+    assert util.uri_match(pattern, uri) is result

asdf/util.py

@@ -3,6 +3,8 @@
 import struct
 import types
 import importlib.util
+import re
+from functools import lru_cache
 
 from urllib.request import pathname2url
 
@@ -449,3 +451,37 @@ def is_primitive(value):
         or isinstance(value, complex)
         or isinstance(value, str)
     )
+
+
+def uri_match(pattern, uri):
+    """
+    Determine if a URI matches a URI pattern with possible
+    wildcards.
+
+    Parameters
+    ----------
+    pattern : str
+        URI pattern with * wildcards.
+    uri : str
+        URI to check against the pattern.
+
+    Returns
+    -------
+    bool
+        `True` if URI matches the pattern.
+    """
+    if not isinstance(uri, str):
+        return False
+
+    if "*" in pattern:
+        return _compile_uri_match_pattern(pattern).match(uri) is not None
+    else:
+        return pattern == uri
+
+
+@lru_cache(128)
+def _compile_uri_match_pattern(pattern):
+    # Escape the pattern in case it contains regex special characters
+    # ('.' in particular is common in URIs) and then replace the
+    # escaped asterisk with a .* regex matcher.
+    return re.compile(re.escape(pattern).replace(r"\*", ".*"))