HTTPMethod enum (#2165)

* Add HTTP enum constants

* Tests

* Add some more string compat

sanic/constants.py

@@ -1,2 +1,28 @@
-HTTP_METHODS = ("GET", "POST", "PUT", "HEAD", "OPTIONS", "PATCH", "DELETE")
+from enum import Enum, auto
+
+
+class HTTPMethod(str, Enum):
+    def _generate_next_value_(name, start, count, last_values):
+        return name.upper()
+
+    def __eq__(self, value: object) -> bool:
+        value = str(value).upper()
+        return super().__eq__(value)
+
+    def __hash__(self) -> int:
+        return hash(self.value)
+
+    def __str__(self) -> str:
+        return self.value
+
+    GET = auto()
+    POST = auto()
+    PUT = auto()
+    HEAD = auto()
+    OPTIONS = auto()
+    PATCH = auto()
+    DELETE = auto()
+
+
+HTTP_METHODS = tuple(HTTPMethod.__members__.values())
 DEFAULT_HTTP_CONTENT_TYPE = "application/octet-stream"

sanic/router.py

@@ -109,7 +109,7 @@ class Router(BaseRouter):
         params = dict(
             path=uri,
             handler=handler,
-            methods=methods,
+            methods=frozenset(map(str, methods)) if methods else None,
             name=name,
             strict=strict_slashes,
             unquote=unquote,