Do not warn if JWKS content type are per RFC 7517

Author: jschlyter

pyproject.toml

@@ -2,7 +2,7 @@
 
 [tool.poetry]
 name = "cryptojwt"
-version = "1.9.3"
+version = "1.9.4"
 description = "Python implementation of JWT, JWE, JWS and JWK"
 authors = ["Roland Hedberg <roland@catalogix.se>"]
 license = "Apache-2.0"

src/cryptojwt/key_bundle.py

@@ -40,6 +40,8 @@
 
 LOGGER = logging.getLogger(__name__)
 
+JWKS_CONTENT_TYPES = set(["application/json", "application/jwk-set+json"])
+
 # def raise_exception(excep, descr, error='service_error'):
 #     _err = json.dumps({'error': error, 'error_description': descr})
 #     raise excep(_err, 'application/json')
@@ -528,8 +530,8 @@ def _parse_remote_response(self, response):
         """
         # Check if the content type is the right one.
         try:
-            if not check_content_type(response.headers["Content-Type"], "application/json"):
-                LOGGER.warning("Wrong Content_type (%s)", response.headers["Content-Type"])
+            if not check_content_type(response.headers["Content-Type"], JWKS_CONTENT_TYPES):
+                LOGGER.warning("Wrong Content-Type (%s)", response.headers["Content-Type"])
         except KeyError:
             pass
 

src/cryptojwt/utils.py

@@ -262,12 +262,17 @@ def httpc_params_loader(httpc_params):
     return httpc_params
 
 
-def check_content_type(content_type, mime_type):
+def check_content_type(content_type: str, mime_type: str | list[str] | set[str]):
     """Return True if the content type contains the MIME type"""
     msg = EmailMessage()
     msg["content-type"] = content_type
     mt = msg.get_content_type()
-    return mime_type == mt
+    if isinstance(mime_type, str):
+        return mt == mime_type
+    elif isinstance(mime_type, (list, set)):
+        return mt in mime_type
+    else:
+        raise ValueError("Invalid MIME type argument")
 
 
 def is_compact_jws(token):

tests/test_31_utils.py

@@ -1,3 +1,5 @@
+import pytest
+
 from cryptojwt.utils import check_content_type
 
 
@@ -15,3 +17,19 @@ def test_check_content_type():
         )
         is False
     )
+    assert (
+        check_content_type(
+            content_type="application/jwk-set+json;charset=UTF-8",
+            mime_type="application/application/jwk-set+json",
+        )
+        is False
+    )
+    assert (
+        check_content_type(
+            content_type="application/jwk-set+json;charset=UTF-8",
+            mime_type=set(["application/application/jwk-set+json", "application/json"]),
+        )
+        is False
+    )
+    with pytest.raises(ValueError):
+        check_content_type(content_type="application/jwk-set+json;charset=UTF-8", mime_type=42)