Refresh Request.accept functionality (#2687)

sanic/errorpages.py

@@ -470,10 +470,8 @@ def exception_response(
                 # Source:
                 # https://developer.mozilla.org/en-US/docs/Web/HTTP/Content_negotiation/List_of_default_Accept_values
 
-                if acceptable and acceptable[0].match(
+                if acceptable and acceptable.match(
-                    "text/html",
+                    "text/html", accept_wildcards=False
-                    allow_type_wildcard=False,
-                    allow_subtype_wildcard=False,
                 ):
                     renderer = HTMLRenderer
 
@@ -483,9 +481,7 @@ def exception_response(
                 elif (
                     acceptable
                     and acceptable.match(
-                        "application/json",
+                        "application/json", accept_wildcards=False
-                        allow_type_wildcard=False,
-                        allow_subtype_wildcard=False,
                     )
                     or content_type == "application/json"
                 ):
@@ -514,13 +510,13 @@ def exception_response(
             # our choice is okay
             if acceptable:
                 type_ = CONTENT_TYPE_BY_RENDERERS.get(renderer)  # type: ignore
-                if type_ and type_ not in acceptable:
+                if type_ and not acceptable.match(type_):
                     # If the renderer selected is not in the Accept header
                     # look through what is in the Accept header, and select
                     # the first option that matches. Otherwise, just drop back
                     # to the original default
                     for accept in acceptable:
-                        mtype = f"{accept.type_}/{accept.subtype}"
+                        mtype = f"{accept.type}/{accept.subtype}"
                         maybe = RENDERERS_BY_CONTENT_TYPE.get(mtype)
                         if maybe:
                             renderer = maybe

sanic/headers.py

@@ -33,143 +33,96 @@ _host_re = re.compile(
 # For more information, consult ../tests/test_requests.py
 
 
-def parse_arg_as_accept(f):
+class MediaType:
-    def func(self, other, *args, **kwargs):
+    """A media type, as used in the Accept header."""
-        if not isinstance(other, Accept) and other:
-            other = Accept.parse(other)
-        return f(self, other, *args, **kwargs)
-
-    return func
-
-
-class MediaType(str):
-    def __new__(cls, value: str):
-        return str.__new__(cls, value)
-
-    def __init__(self, value: str) -> None:
-        self.value = value
-        self.is_wildcard = self.check_if_wildcard(value)
-
-    def __eq__(self, other):
-        if self.is_wildcard:
-            return True
-
-        if self.match(other):
-            return True
-
-        other_is_wildcard = (
-            other.is_wildcard
-            if isinstance(other, MediaType)
-            else self.check_if_wildcard(other)
-        )
-
-        return other_is_wildcard
-
-    def match(self, other):
-        other_value = other.value if isinstance(other, MediaType) else other
-        return self.value == other_value
-
-    @staticmethod
-    def check_if_wildcard(value):
-        return value == "*"
-
-
-class Accept(str):
-    def __new__(cls, value: str, *args, **kwargs):
-        return str.__new__(cls, value)
 
     def __init__(
         self,
-        value: str,
+        type_: str,
-        type_: MediaType,
+        subtype: str,
-        subtype: MediaType,
+        **params: str,
-        *,
-        q: str = "1.0",
-        **kwargs: str,
     ):
-        qvalue = float(q)
+        self.type = type_
-        if qvalue > 1 or qvalue < 0:
-            raise InvalidHeader(
-                f"Accept header qvalue must be between 0 and 1, not: {qvalue}"
-            )
-        self.value = value
-        self.type_ = type_
         self.subtype = subtype
-        self.qvalue = qvalue
+        self.q = float(params.get("q", "1.0"))
-        self.params = kwargs
+        self.params = params
+        self.mime = f"{type_}/{subtype}"
+        self.key = (
+            -1 * self.q,
+            -1 * len(self.params),
+            self.subtype == "*",
+            self.type == "*",
+        )
 
-    def _compare(self, other, method):
+    def __repr__(self):
-        try:
+        return self.mime + "".join(f";{k}={v}" for k, v in self.params.items())
-            return method(self.qvalue, other.qvalue)
+
-        except (AttributeError, TypeError):
+    def __eq__(self, other):
+        """Check for mime (str or MediaType) identical type/subtype.
+        Parameters such as q are not considered."""
+        if isinstance(other, str):
+            # Give a friendly reminder if str contains parameters
+            if ";" in other:
+                raise ValueError("Use match() to compare with parameters")
+            return self.mime == other
+        if isinstance(other, MediaType):
+            # Ignore parameters silently with MediaType objects
+            return self.mime == other.mime
         return NotImplemented
 
-    @parse_arg_as_accept
-    def __lt__(self, other: Union[str, Accept]):
-        return self._compare(other, lambda s, o: s < o)
-
-    @parse_arg_as_accept
-    def __le__(self, other: Union[str, Accept]):
-        return self._compare(other, lambda s, o: s <= o)
-
-    @parse_arg_as_accept
-    def __eq__(self, other: Union[str, Accept]):  # type: ignore
-        return self._compare(other, lambda s, o: s == o)
-
-    @parse_arg_as_accept
-    def __ge__(self, other: Union[str, Accept]):
-        return self._compare(other, lambda s, o: s >= o)
-
-    @parse_arg_as_accept
-    def __gt__(self, other: Union[str, Accept]):
-        return self._compare(other, lambda s, o: s > o)
-
-    @parse_arg_as_accept
-    def __ne__(self, other: Union[str, Accept]):  # type: ignore
-        return self._compare(other, lambda s, o: s != o)
-
-    @parse_arg_as_accept
     def match(
         self,
-        other,
+        mime_with_params: Union[str, MediaType],
-        *,
+    ) -> Optional[MediaType]:
-        allow_type_wildcard: bool = True,
+        """Check if this media type matches the given mime type/subtype.
-        allow_subtype_wildcard: bool = True,
+        Wildcards are supported both ways on both type and subtype.
-    ) -> bool:
+        If mime contains a semicolon, optionally followed by parameters,
-        type_match = (
+        the parameters of the two media types must match exactly.
-            self.type_ == other.type_
+        Note:  Use the `==` operator instead to check for literal matches
-            if allow_type_wildcard
+        without expanding wildcards.
-            else (
+        @param media_type: A type/subtype string to match.
-                self.type_.match(other.type_)
+        @return `self` if the media types are compatible, else `None`
-                and not self.type_.is_wildcard
+        """
-                and not other.type_.is_wildcard
+        mt = (
+            MediaType._parse(mime_with_params)
+            if isinstance(mime_with_params, str)
+            else mime_with_params
+        )
+        return (
+            self
+            if (
+                mt
+                # All parameters given in the other media type must match
+                and all(self.params.get(k) == v for k, v in mt.params.items())
+                # Subtype match
+                and (
+                    self.subtype == mt.subtype
+                    or self.subtype == "*"
+                    or mt.subtype == "*"
+                )
+                # Type match
+                and (
+                    self.type == mt.type or self.type == "*" or mt.type == "*"
                 )
             )
-        subtype_match = (
+            else None
-            self.subtype == other.subtype
-            if allow_subtype_wildcard
-            else (
-                self.subtype.match(other.subtype)
-                and not self.subtype.is_wildcard
-                and not other.subtype.is_wildcard
-            )
         )
 
-        return type_match and subtype_match
+    @property
+    def has_wildcard(self) -> bool:
+        """Return True if this media type has a wildcard in it."""
+        return any(part == "*" for part in (self.subtype, self.type))
 
     @classmethod
-    def parse(cls, raw: str) -> Accept:
+    def _parse(cls, mime_with_params: str) -> Optional[MediaType]:
-        invalid = False
+        mtype = mime_with_params.strip()
-        mtype = raw.strip()
+        if "/" not in mime_with_params:
+            return None
 
-        try:
+        mime, *raw_params = mtype.split(";")
-            media, *raw_params = mtype.split(";")
+        type_, subtype = mime.split("/", 1)
-            type_, subtype = media.split("/")
+        if not type_ or not subtype:
-        except ValueError:
+            raise ValueError(f"Invalid media type: {mtype}")
-            invalid = True
-
-        if invalid or not type_ or not subtype:
-            raise InvalidHeader(f"Header contains invalid Accept value: {raw}")
 
         params = dict(
             [
@@ -178,29 +131,140 @@ class Accept(str):
             ]
         )
 
-        return cls(mtype, MediaType(type_), MediaType(subtype), **params)
+        return cls(type_.lstrip(), subtype.rstrip(), **params)
 
 
-class AcceptContainer(list):
+class Matched:
-    def __contains__(self, o: object) -> bool:
+    """A matching result of a MIME string against a header."""
-        return any(item.match(o) for item in self)
 
-    def match(
+    def __init__(self, mime: str, header: Optional[MediaType]):
-        self,
+        self.mime = mime
-        o: object,
+        self.header = header
-        *,
+
-        allow_type_wildcard: bool = True,
+    def __repr__(self):
-        allow_subtype_wildcard: bool = True,
+        return f"<{self} matched {self.header}>" if self else "<no match>"
-    ) -> bool:
+
-        return any(
+    def __str__(self):
-            item.match(
+        return self.mime
-                o,
+
-                allow_type_wildcard=allow_type_wildcard,
+    def __bool__(self):
-                allow_subtype_wildcard=allow_subtype_wildcard,
+        return self.header is not None
+
+    def __eq__(self, other: Any) -> bool:
+        try:
+            comp, other_accept = self._compare(other)
+        except TypeError:
+            return False
+
+        return bool(
+            comp
+            and (
+                (self.header and other_accept.header)
+                or (not self.header and not other_accept.header)
             )
-            for item in self
         )
 
+    def _compare(self, other) -> Tuple[bool, Matched]:
+        if isinstance(other, str):
+            # return self.mime == other, Accept.parse(other)
+            parsed = Matched.parse(other)
+            if self.mime == other:
+                return True, parsed
+            other = parsed
+
+        if isinstance(other, Matched):
+            return self.header == other.header, other
+
+        raise TypeError(
+            "Comparison not supported between unequal "
+            f"mime types of '{self.mime}' and '{other}'"
+        )
+
+    def match(self, other: Union[str, Matched]) -> Optional[Matched]:
+        accept = Matched.parse(other) if isinstance(other, str) else other
+        if not self.header or not accept.header:
+            return None
+        if self.header.match(accept.header):
+            return accept
+        return None
+
+    @classmethod
+    def parse(cls, raw: str) -> Matched:
+        media_type = MediaType._parse(raw)
+        return cls(raw, media_type)
+
+
+class AcceptList(list):
+    """A list of media types, as used in the Accept header.
+
+    The Accept header entries are listed in order of preference, starting
+    with the most preferred. This class is a list of `MediaType` objects,
+    that encapsulate also the q value or any other parameters.
+
+    Two separate methods are provided for searching the list:
+    - 'match' for finding the most preferred match (wildcards supported)
+    -  operator 'in' for checking explicit matches (wildcards as literals)
+    """
+
+    def match(self, *mimes: str, accept_wildcards=True) -> Matched:
+        """Find a media type accepted by the client.
+
+        This method can be used to find which of the media types requested by
+        the client is most preferred against the ones given as arguments.
+
+        The ordering of preference is set by:
+        1. The order set by RFC 7231, s. 5.3.2, giving a higher priority
+            to q values and more specific type definitions,
+        2. The order of the arguments (first is most preferred), and
+        3. The first matching entry on the Accept header.
+
+        Wildcards are matched both ways. A match is usually found, as the
+        Accept headers typically include `*/*`, in particular if the header
+        is missing, is not manually set, or if the client is a browser.
+
+        Note: the returned object behaves as a string of the mime argument
+        that matched, and is empty/falsy if no match was found. The matched
+        header entry `MediaType` or `None` is available as the `m` attribute.
+
+        @param mimes: Any MIME types to search for in order of preference.
+        @param accept_wildcards: Match Accept entries with wildcards in them.
+        @return A match object with the mime string and the MediaType object.
+        """
+        a = sorted(
+            (-acc.q, i, j, mime, acc)
+            for j, acc in enumerate(self)
+            if accept_wildcards or not acc.has_wildcard
+            for i, mime in enumerate(mimes)
+            if acc.match(mime)
+        )
+        return Matched(*(a[0][-2:] if a else ("", None)))
+
+    def __str__(self):
+        """Format as Accept header value (parsed, not original)."""
+        return ", ".join(str(m) for m in self)
+
+
+def parse_accept(accept: Optional[str]) -> AcceptList:
+    """Parse an Accept header and order the acceptable media types in
+    according to RFC 7231, s. 5.3.2
+    https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2
+    """
+    if not accept:
+        if accept == "":
+            return AcceptList()  # Empty header, accept nothing
+        accept = "*/*"  # No header means that all types are accepted
+    try:
+        a = [
+            mt
+            for mt in [MediaType._parse(mtype) for mtype in accept.split(",")]
+            if mt
+        ]
+        if not a:
+            raise ValueError
+        return AcceptList(sorted(a, key=lambda x: x.key))
+    except ValueError:
+        raise InvalidHeader(f"Invalid header value in Accept: {accept}")
+
 
 def parse_content_header(value: str) -> Tuple[str, Options]:
     """Parse content-type and content-disposition header values.
@@ -368,34 +432,6 @@ def format_http1_response(status: int, headers: HeaderBytesIterable) -> bytes:
     return ret
 
 
-def _sort_accept_value(accept: Accept):
-    return (
-        accept.qvalue,
-        len(accept.params),
-        accept.subtype != "*",
-        accept.type_ != "*",
-    )
-
-
-def parse_accept(accept: str) -> AcceptContainer:
-    """Parse an Accept header and order the acceptable media types in
-    accorsing to RFC 7231, s. 5.3.2
-    https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2
-    """
-    media_types = accept.split(",")
-    accept_list: List[Accept] = []
-
-    for mtype in media_types:
-        if not mtype:
-            continue
-
-        accept_list.append(Accept.parse(mtype))
-
-    return AcceptContainer(
-        sorted(accept_list, key=_sort_accept_value, reverse=True)
-    )
-
-
 def parse_credentials(
     header: Optional[str],
     prefixes: Union[List, Tuple, Set] = None,

sanic/request.py

@@ -47,7 +47,7 @@ from sanic.constants import (
 )
 from sanic.exceptions import BadRequest, BadURL, ServerError
 from sanic.headers import (
-    AcceptContainer,
+    AcceptList,
     Options,
     parse_accept,
     parse_content_header,
@@ -167,7 +167,7 @@ class Request:
         self.conn_info: Optional[ConnInfo] = None
         self.ctx = SimpleNamespace()
         self.parsed_forwarded: Optional[Options] = None
-        self.parsed_accept: Optional[AcceptContainer] = None
+        self.parsed_accept: Optional[AcceptList] = None
         self.parsed_credentials: Optional[Credentials] = None
         self.parsed_json = None
         self.parsed_form: Optional[RequestParameters] = None
@@ -499,10 +499,10 @@ class Request:
         return self.parsed_json
 
     @property
-    def accept(self) -> AcceptContainer:
+    def accept(self) -> AcceptList:
         """
         :return: The ``Accept`` header parsed
-        :rtype: AcceptContainer
+        :rtype: AcceptList
         """
         if self.parsed_accept is None:
             accept_header = self.headers.getone("accept", "")

tests/test_asgi.py

@@ -351,6 +351,7 @@ async def test_websocket_text_receive(send, receive, message_stack):
 
     assert text == msg["text"]
 
+
 @pytest.mark.asyncio
 async def test_websocket_bytes_receive(send, receive, message_stack):
     msg = {"bytes": b"hello", "type": "websocket.receive"}
@@ -361,6 +362,7 @@ async def test_websocket_bytes_receive(send, receive, message_stack):
 
     assert data == msg["bytes"]
 
+
 @pytest.mark.asyncio
 async def test_websocket_accept_with_no_subprotocols(
     send, receive, message_stack

tests/test_headers.py

@@ -50,7 +50,10 @@ def raised_ceiling():
             # cgi.parse_header:
             # ('form-data', {'name': 'files', 'filename': 'fo"o;bar\\'})
             # werkzeug.parse_options_header:
-            # ('form-data', {'name': 'files', 'filename': '"fo\\"o', 'bar\\"': None})
+            # (
+            #     "form-data",
+            #     {"name": "files", "filename": '"fo\\"o', 'bar\\"': None},
+            # ),
         ),
         # <input type=file name="foo&quot;;bar\"> with Unicode filename!
         (
@@ -187,27 +190,24 @@ def test_request_line(app):
 
 
 @pytest.mark.parametrize(
-    "raw",
+    "raw,expected_subtype",
     (
-        "show/first, show/second",
+        ("show/first, show/second", "first"),
-        "show/*, show/first",
+        ("show/*, show/first", "first"),
-        "*/*, show/first",
+        ("*/*, show/first", "first"),
-        "*/*, show/*",
+        ("*/*, show/*", "*"),
-        "other/*; q=0.1, show/*; q=0.2",
+        ("other/*; q=0.1, show/*; q=0.2", "*"),
-        "show/first; q=0.5, show/second; q=0.5",
+        ("show/first; q=0.5, show/second; q=0.5", "first"),
-        "show/first; foo=bar, show/second; foo=bar",
+        ("show/first; foo=bar, show/second; foo=bar", "first"),
-        "show/second, show/first; foo=bar",
+        ("show/second, show/first; foo=bar", "first"),
-        "show/second; q=0.5, show/first; foo=bar; q=0.5",
+        ("show/second; q=0.5, show/first; foo=bar; q=0.5", "first"),
-        "show/second; q=0.5, show/first; q=1.0",
+        ("show/second; q=0.5, show/first; q=1.0", "first"),
-        "show/first, show/second; q=1.0",
+        ("show/first, show/second; q=1.0", "second"),
     ),
 )
-def test_parse_accept_ordered_okay(raw):
+def test_parse_accept_ordered_okay(raw, expected_subtype):
     ordered = headers.parse_accept(raw)
-    expected_subtype = (
+    assert ordered[0].type == "show"
-        "*" if all(q.subtype.is_wildcard for q in ordered) else "first"
-    )
-    assert ordered[0].type_ == "show"
     assert ordered[0].subtype == expected_subtype
 
 
@@ -217,6 +217,7 @@ def test_parse_accept_ordered_okay(raw):
         "missing",
         "missing/",
         "/missing",
+        "/",
     ),
 )
 def test_bad_accept(raw):
@@ -225,128 +226,83 @@ def test_bad_accept(raw):
 
 
 def test_empty_accept():
-    assert headers.parse_accept("") == []
+    a = headers.parse_accept("")
+    assert a == []
+    assert not a.match("*/*")
 
 
 def test_wildcard_accept_set_ok():
     accept = headers.parse_accept("*/*")[0]
-    assert accept.type_.is_wildcard
+    assert accept.type == "*"
-    assert accept.subtype.is_wildcard
+    assert accept.subtype == "*"
+    assert accept.has_wildcard
+
+    accept = headers.parse_accept("foo/*")[0]
+    assert accept.type == "foo"
+    assert accept.subtype == "*"
+    assert accept.has_wildcard
 
     accept = headers.parse_accept("foo/bar")[0]
-    assert not accept.type_.is_wildcard
+    assert accept.type == "foo"
-    assert not accept.subtype.is_wildcard
+    assert accept.subtype == "bar"
+    assert not accept.has_wildcard
 
 
 def test_accept_parsed_against_str():
-    accept = headers.Accept.parse("foo/bar")
+    accept = headers.Matched.parse("foo/bar")
-    assert accept > "foo/bar; q=0.1"
+    assert accept == "foo/bar; q=0.1"
-
-
-def test_media_type_equality():
-    assert headers.MediaType("foo") == headers.MediaType("foo") == "foo"
-    assert headers.MediaType("foo") == headers.MediaType("*") == "*"
-    assert headers.MediaType("foo") != headers.MediaType("bar")
-    assert headers.MediaType("foo") != "bar"
 
 
 def test_media_type_matching():
-    assert headers.MediaType("foo").match(headers.MediaType("foo"))
+    assert headers.MediaType("foo", "bar").match(
-    assert headers.MediaType("foo").match("foo")
+        headers.MediaType("foo", "bar")
-
+    )
-    assert not headers.MediaType("foo").match(headers.MediaType("*"))
+    assert headers.MediaType("foo", "bar").match("foo/bar")
-    assert not headers.MediaType("foo").match("*")
-
-    assert not headers.MediaType("foo").match(headers.MediaType("bar"))
-    assert not headers.MediaType("foo").match("bar")
 
 
 @pytest.mark.parametrize(
-    "value,other,outcome,allow_type,allow_subtype",
+    "value,other,outcome",
     (
         # ALLOW BOTH
-        ("foo/bar", "foo/bar", True, True, True),
+        ("foo/bar", "foo/bar", True),
-        ("foo/bar", headers.Accept.parse("foo/bar"), True, True, True),
+        ("foo/bar", headers.Matched.parse("foo/bar"), True),
-        ("foo/bar", "foo/*", True, True, True),
+        ("foo/bar", "foo/*", True),
-        ("foo/bar", headers.Accept.parse("foo/*"), True, True, True),
+        ("foo/bar", headers.Matched.parse("foo/*"), True),
-        ("foo/bar", "*/*", True, True, True),
+        ("foo/bar", "*/*", True),
-        ("foo/bar", headers.Accept.parse("*/*"), True, True, True),
+        ("foo/bar", headers.Matched.parse("*/*"), True),
-        ("foo/*", "foo/bar", True, True, True),
+        ("foo/*", "foo/bar", True),
-        ("foo/*", headers.Accept.parse("foo/bar"), True, True, True),
+        ("foo/*", headers.Matched.parse("foo/bar"), True),
-        ("foo/*", "foo/*", True, True, True),
+        ("foo/*", "foo/*", True),
-        ("foo/*", headers.Accept.parse("foo/*"), True, True, True),
+        ("foo/*", headers.Matched.parse("foo/*"), True),
-        ("foo/*", "*/*", True, True, True),
+        ("foo/*", "*/*", True),
-        ("foo/*", headers.Accept.parse("*/*"), True, True, True),
+        ("foo/*", headers.Matched.parse("*/*"), True),
-        ("*/*", "foo/bar", True, True, True),
+        ("*/*", "foo/bar", True),
-        ("*/*", headers.Accept.parse("foo/bar"), True, True, True),
+        ("*/*", headers.Matched.parse("foo/bar"), True),
-        ("*/*", "foo/*", True, True, True),
+        ("*/*", "foo/*", True),
-        ("*/*", headers.Accept.parse("foo/*"), True, True, True),
+        ("*/*", headers.Matched.parse("foo/*"), True),
-        ("*/*", "*/*", True, True, True),
+        ("*/*", "*/*", True),
-        ("*/*", headers.Accept.parse("*/*"), True, True, True),
+        ("*/*", headers.Matched.parse("*/*"), True),
-        # ALLOW TYPE
-        ("foo/bar", "foo/bar", True, True, False),
-        ("foo/bar", headers.Accept.parse("foo/bar"), True, True, False),
-        ("foo/bar", "foo/*", False, True, False),
-        ("foo/bar", headers.Accept.parse("foo/*"), False, True, False),
-        ("foo/bar", "*/*", False, True, False),
-        ("foo/bar", headers.Accept.parse("*/*"), False, True, False),
-        ("foo/*", "foo/bar", False, True, False),
-        ("foo/*", headers.Accept.parse("foo/bar"), False, True, False),
-        ("foo/*", "foo/*", False, True, False),
-        ("foo/*", headers.Accept.parse("foo/*"), False, True, False),
-        ("foo/*", "*/*", False, True, False),
-        ("foo/*", headers.Accept.parse("*/*"), False, True, False),
-        ("*/*", "foo/bar", False, True, False),
-        ("*/*", headers.Accept.parse("foo/bar"), False, True, False),
-        ("*/*", "foo/*", False, True, False),
-        ("*/*", headers.Accept.parse("foo/*"), False, True, False),
-        ("*/*", "*/*", False, True, False),
-        ("*/*", headers.Accept.parse("*/*"), False, True, False),
-        # ALLOW SUBTYPE
-        ("foo/bar", "foo/bar", True, False, True),
-        ("foo/bar", headers.Accept.parse("foo/bar"), True, False, True),
-        ("foo/bar", "foo/*", True, False, True),
-        ("foo/bar", headers.Accept.parse("foo/*"), True, False, True),
-        ("foo/bar", "*/*", False, False, True),
-        ("foo/bar", headers.Accept.parse("*/*"), False, False, True),
-        ("foo/*", "foo/bar", True, False, True),
-        ("foo/*", headers.Accept.parse("foo/bar"), True, False, True),
-        ("foo/*", "foo/*", True, False, True),
-        ("foo/*", headers.Accept.parse("foo/*"), True, False, True),
-        ("foo/*", "*/*", False, False, True),
-        ("foo/*", headers.Accept.parse("*/*"), False, False, True),
-        ("*/*", "foo/bar", False, False, True),
-        ("*/*", headers.Accept.parse("foo/bar"), False, False, True),
-        ("*/*", "foo/*", False, False, True),
-        ("*/*", headers.Accept.parse("foo/*"), False, False, True),
-        ("*/*", "*/*", False, False, True),
-        ("*/*", headers.Accept.parse("*/*"), False, False, True),
     ),
 )
-def test_accept_matching(value, other, outcome, allow_type, allow_subtype):
+def test_accept_matching(value, other, outcome):
-    assert (
+    assert bool(headers.Matched.parse(value).match(other)) is outcome
-        headers.Accept.parse(value).match(
-            other,
-            allow_type_wildcard=allow_type,
-            allow_subtype_wildcard=allow_subtype,
-        )
-        is outcome
-    )
 
 
 @pytest.mark.parametrize("value", ("foo/bar", "foo/*", "*/*"))
 def test_value_in_accept(value):
     acceptable = headers.parse_accept(value)
-    assert "foo/bar" in acceptable
+    assert acceptable.match("foo/bar")
-    assert "foo/*" in acceptable
+    assert acceptable.match("foo/*")
-    assert "*/*" in acceptable
+    assert acceptable.match("*/*")
 
 
 @pytest.mark.parametrize("value", ("foo/bar", "foo/*"))
 def test_value_not_in_accept(value):
     acceptable = headers.parse_accept(value)
-    assert "no/match" not in acceptable
+    assert not acceptable.match("no/match")
-    assert "no/*" not in acceptable
+    assert not acceptable.match("no/*")
+    assert "*/*" not in acceptable
+    assert "*/bar" not in acceptable
 
 
 @pytest.mark.parametrize(
@@ -365,6 +321,117 @@ def test_value_not_in_accept(value):
         ),
     ),
 )
-def test_browser_headers(header, expected):
+def test_browser_headers_general(header, expected):
     request = Request(b"/", {"accept": header}, "1.1", "GET", None, None)
-    assert request.accept == expected
+    assert [str(item) for item in request.accept] == expected
+
+
+@pytest.mark.parametrize(
+    "header,expected",
+    (
+        (
+            "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",  # noqa: E501
+            [
+                ("text/html", 1.0),
+                ("application/xhtml+xml", 1.0),
+                ("image/avif", 1.0),
+                ("image/webp", 1.0),
+                ("application/xml", 0.9),
+                ("*/*", 0.8),
+            ],
+        ),
+    ),
+)
+def test_browser_headers_specific(header, expected):
+    mimes = [e[0] for e in expected]
+    qs = [e[1] for e in expected]
+    request = Request(b"/", {"accept": header}, "1.1", "GET", None, None)
+    assert request.accept == mimes
+    for a, m, q in zip(request.accept, mimes, qs):
+        assert a == m
+        assert a.mime == m
+        assert a.q == q
+
+
+@pytest.mark.parametrize(
+    "raw",
+    (
+        "text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8",
+        "application/xml;q=0.9, */*;q=0.8, text/html, application/xhtml+xml",
+        (
+            "foo/bar;q=0.9, */*;q=0.8, text/html=0.8, "
+            "text/plain, application/xhtml+xml"
+        ),
+    ),
+)
+def test_accept_ordering(raw):
+    """Should sort by q but also be stable."""
+    accept = headers.parse_accept(raw)
+    assert accept[0].type == "text"
+    raw1 = ", ".join(str(a) for a in accept)
+    accept = headers.parse_accept(raw1)
+    raw2 = ", ".join(str(a) for a in accept)
+    assert raw1 == raw2
+
+
+def test_not_accept_wildcard():
+    accept = headers.parse_accept("*/*, foo/*, */bar, foo/bar;q=0.1")
+    assert not accept.match(
+        "text/html", "foo/foo", "bar/bar", accept_wildcards=False
+    )
+    # Should ignore wildcards in accept but still matches them from mimes
+    m = accept.match("text/plain", "*/*", accept_wildcards=False)
+    assert m.mime == "*/*"
+    assert m.match("*/*")
+    assert m.header == "foo/bar"
+    assert not accept.match(
+        "text/html", "foo/foo", "bar/bar", accept_wildcards=False
+    )
+
+
+def test_accept_misc():
+    header = (
+        "foo/bar;q=0.0, */plain;param=123, text/plain, text/*, foo/bar;q=0.5"
+    )
+    a = headers.parse_accept(header)
+    assert repr(a) == (
+        "[*/plain;param=123, text/plain, text/*, "
+        "foo/bar;q=0.5, foo/bar;q=0.0]"
+    )  # noqa: E501
+    assert str(a) == (
+        "*/plain;param=123, text/plain, text/*, "
+        "foo/bar;q=0.5, foo/bar;q=0.0"
+    )  # noqa: E501
+    # q=1 types don't match foo/bar but match the two others,
+    # text/* comes first and matches */plain because it
+    # comes first in the header
+    m = a.match("foo/bar", "text/*", "text/plain")
+    assert repr(m) == "<text/* matched */plain;param=123>"
+    assert m == "text/*"
+    assert m.mime == "text/*"
+    assert m.header.mime == "*/plain"
+    assert m.header.type == "*"
+    assert m.header.subtype == "plain"
+    assert m.header.q == 1.0
+    assert m.header.params == dict(param="123")
+    # Matches object against another Matched object (by mime and header)
+    assert m == a.match("text/*")
+    # Against unsupported type falls back to object id matching
+    assert m != 123
+    # Matches the highest q value
+    m = a.match("foo/bar")
+    assert repr(m) == "<foo/bar matched foo/bar;q=0.5>"
+    assert m == "foo/bar"
+    assert m == "foo/bar;q=0.5"
+    # Matching nothing special case
+    m = a.match()
+    assert m == ""
+    assert m.header is None
+    # No header means anything
+    a = headers.parse_accept(None)
+    assert a == ["*/*"]
+    assert a.match("foo/bar")
+    # Empty header means nothing
+    a = headers.parse_accept("")
+    assert a == []
+    assert not a.match("foo/bar")

tests/test_request.py

@@ -156,7 +156,7 @@ def test_request_accept():
             "Accept": "text/*, text/plain, text/plain;format=flowed, */*"
         },
     )
-    assert request.accept == [
+    assert [str(i) for i in request.accept] == [
         "text/plain;format=flowed",
         "text/plain",
         "text/*",
@@ -171,7 +171,7 @@ def test_request_accept():
             )
         },
     )
-    assert request.accept == [
+    assert [str(i) for i in request.accept] == [
         "text/html",
         "text/x-c",
         "text/x-dvi;q=0.8",