Add convenience methods for cookie creation and deletion (#2706)

* Add convenience methods for cookie creation and deletion

* Restore del

* Backwards compat, forward thinking

* Add delitem deprecation notice

* Add get full deprecation notice

* Add deprecation docstring

* Better deprecation docstring

* Add has_cookie

* Same defaults

* Better deprecation message

* Accessor annotations

* make pretty

* parse cookies

* Revert quote translator

* make pretty

* make pretty

* Add unit tests

* Make pretty

* Fix unit tests

* Directly include unquote

* Add some more unit tests

* Move modules into their own dir

* make pretty

* cleanup test imports

* Add test for cookie accessor

* Make test consistent

* Remove file

* Remove additional escaping

* Add header style getattr for hyphens

* Add test for cookie accessor with hyphens

* Add new translator

* Parametrize test_request_with_duplicate_cookie_key

* make pretty

* Add deprecation of direct cookie encoding

* Speedup Cookie creation

* Implement prefixes on delete_cookie

* typing changes

* Add passthru functions on response objects for setting cookies

* Add test for passthru

---------

Co-authored-by: L. Kärkkäinen <98187+Tronic@users.noreply.github.com>

sanic/cookies/__init__.py

@@ -0,0 +1,4 @@
+from .response import Cookie, CookieJar
+
+
+__all__ = ("Cookie", "CookieJar")

sanic/cookies/request.py

@@ -0,0 +1,118 @@
+import re
+
+from typing import Any, Dict, List, Optional
+
+from sanic.cookies.response import Cookie
+from sanic.log import deprecation
+from sanic.request.parameters import RequestParameters
+
+
+COOKIE_NAME_RESERVED_CHARS = re.compile(
+    '[\x00-\x1F\x7F-\xFF()<>@,;:\\\\"/[\\]?={} \x09]'
+)
+OCTAL_PATTERN = re.compile(r"\\[0-3][0-7][0-7]")
+QUOTE_PATTERN = re.compile(r"[\\].")
+
+
+def _unquote(str):  # no cov
+    if str is None or len(str) < 2:
+        return str
+    if str[0] != '"' or str[-1] != '"':
+        return str
+
+    str = str[1:-1]
+
+    i = 0
+    n = len(str)
+    res = []
+    while 0 <= i < n:
+        o_match = OCTAL_PATTERN.search(str, i)
+        q_match = QUOTE_PATTERN.search(str, i)
+        if not o_match and not q_match:
+            res.append(str[i:])
+            break
+        # else:
+        j = k = -1
+        if o_match:
+            j = o_match.start(0)
+        if q_match:
+            k = q_match.start(0)
+        if q_match and (not o_match or k < j):
+            res.append(str[i:k])
+            res.append(str[k + 1])
+            i = k + 2
+        else:
+            res.append(str[i:j])
+            res.append(chr(int(str[j + 1 : j + 4], 8)))  # noqa: E203
+            i = j + 4
+    return "".join(res)
+
+
+def parse_cookie(raw: str):
+    cookies: Dict[str, List] = {}
+
+    for token in raw.split(";"):
+        name, __, value = token.partition("=")
+        name = name.strip()
+        value = value.strip()
+
+        if not name:
+            continue
+
+        if COOKIE_NAME_RESERVED_CHARS.search(name):  # no cov
+            continue
+
+        if len(value) > 2 and value[0] == '"' and value[-1] == '"':  # no cov
+            value = _unquote(value)
+
+        if name in cookies:
+            cookies[name].append(value)
+        else:
+            cookies[name] = [value]
+
+    return cookies
+
+
+class CookieRequestParameters(RequestParameters):
+    def __getitem__(self, key: str) -> Optional[str]:
+        deprecation(
+            f"You are accessing cookie key '{key}', which is currently in "
+            "compat mode returning a single cookie value. Starting in v24.3 "
+            "accessing a cookie value like this will return a list of values. "
+            "To avoid this behavior and continue accessing a single value, "
+            f"please upgrade from request.cookies['{key}'] to "
+            f"request.cookies.get('{key}'). See more details: ___.",
+            24.3,
+        )
+        try:
+            value = self._get_prefixed_cookie(key)
+        except KeyError:
+            value = super().__getitem__(key)
+        return value[0]
+
+    def __getattr__(self, key: str) -> str:
+        if key.startswith("_"):
+            return self.__getattribute__(key)
+        key = key.rstrip("_").replace("_", "-")
+        return str(self.get(key, ""))
+
+    def get(self, name: str, default: Optional[Any] = None) -> Optional[Any]:
+        try:
+            return self._get_prefixed_cookie(name)[0]
+        except KeyError:
+            return super().get(name, default)
+
+    def getlist(
+        self, name: str, default: Optional[Any] = None
+    ) -> Optional[Any]:
+        try:
+            return self._get_prefixed_cookie(name)
+        except KeyError:
+            return super().getlist(name, default)
+
+    def _get_prefixed_cookie(self, name: str) -> Any:
+        getitem = super().__getitem__
+        try:
+            return getitem(f"{Cookie.HOST_PREFIX}{name}")
+        except KeyError:
+            return getitem(f"{Cookie.SECURE_PREFIX}{name}")