up follow livre

venv/lib/python3.13/site-packages/werkzeug/sansio/http.py

@@ -0,0 +1,170 @@
+from __future__ import annotations
+
+import re
+import typing as t
+from datetime import datetime
+
+from .._internal import _dt_as_utc
+from ..http import generate_etag
+from ..http import parse_date
+from ..http import parse_etags
+from ..http import parse_if_range_header
+from ..http import unquote_etag
+
+_etag_re = re.compile(r'([Ww]/)?(?:"(.*?)"|(.*?))(?:\s*,\s*|$)')
+
+
+def is_resource_modified(
+    http_range: str | None = None,
+    http_if_range: str | None = None,
+    http_if_modified_since: str | None = None,
+    http_if_none_match: str | None = None,
+    http_if_match: str | None = None,
+    etag: str | None = None,
+    data: bytes | None = None,
+    last_modified: datetime | str | None = None,
+    ignore_if_range: bool = True,
+) -> bool:
+    """Convenience method for conditional requests.
+    :param http_range: Range HTTP header
+    :param http_if_range: If-Range HTTP header
+    :param http_if_modified_since: If-Modified-Since HTTP header
+    :param http_if_none_match: If-None-Match HTTP header
+    :param http_if_match: If-Match HTTP header
+    :param etag: the etag for the response for comparison.
+    :param data: or alternatively the data of the response to automatically
+                 generate an etag using :func:`generate_etag`.
+    :param last_modified: an optional date of the last modification.
+    :param ignore_if_range: If `False`, `If-Range` header will be taken into
+                            account.
+    :return: `True` if the resource was modified, otherwise `False`.
+
+    .. versionadded:: 2.2
+    """
+    if etag is None and data is not None:
+        etag = generate_etag(data)
+    elif data is not None:
+        raise TypeError("both data and etag given")
+
+    unmodified = False
+    if isinstance(last_modified, str):
+        last_modified = parse_date(last_modified)
+
+    # HTTP doesn't use microsecond, remove it to avoid false positive
+    # comparisons. Mark naive datetimes as UTC.
+    if last_modified is not None:
+        last_modified = _dt_as_utc(last_modified.replace(microsecond=0))
+
+    if_range = None
+    if not ignore_if_range and http_range is not None:
+        # https://tools.ietf.org/html/rfc7233#section-3.2
+        # A server MUST ignore an If-Range header field received in a request
+        # that does not contain a Range header field.
+        if_range = parse_if_range_header(http_if_range)
+
+    if if_range is not None and if_range.date is not None:
+        modified_since: datetime | None = if_range.date
+    else:
+        modified_since = parse_date(http_if_modified_since)
+
+    if modified_since and last_modified and last_modified <= modified_since:
+        unmodified = True
+
+    if etag:
+        etag, _ = unquote_etag(etag)
+
+        if if_range is not None and if_range.etag is not None:
+            unmodified = parse_etags(if_range.etag).contains(etag)
+        else:
+            if_none_match = parse_etags(http_if_none_match)
+            if if_none_match:
+                # https://tools.ietf.org/html/rfc7232#section-3.2
+                # "A recipient MUST use the weak comparison function when comparing
+                # entity-tags for If-None-Match"
+                unmodified = if_none_match.contains_weak(etag)
+
+            # https://tools.ietf.org/html/rfc7232#section-3.1
+            # "Origin server MUST use the strong comparison function when
+            # comparing entity-tags for If-Match"
+            if_match = parse_etags(http_if_match)
+            if if_match:
+                unmodified = not if_match.is_strong(etag)
+
+    return not unmodified
+
+
+_cookie_re = re.compile(
+    r"""
+    ([^=;]*)
+    (?:\s*=\s*
+      (
+        "(?:[^\\"]|\\.)*"
+      |
+        .*?
+      )
+    )?
+    \s*;\s*
+    """,
+    flags=re.ASCII | re.VERBOSE,
+)
+_cookie_unslash_re = re.compile(rb"\\([0-3][0-7]{2}|.)")
+
+
+def _cookie_unslash_replace(m: t.Match[bytes]) -> bytes:
+    v = m.group(1)
+
+    if len(v) == 1:
+        return v
+
+    return int(v, 8).to_bytes(1, "big")
+
+
+def parse_cookie(
+    cookie: str | None = None,
+    cls: type[ds.MultiDict[str, str]] | None = None,
+) -> ds.MultiDict[str, str]:
+    """Parse a cookie from a string.
+
+    The same key can be provided multiple times, the values are stored
+    in-order. The default :class:`MultiDict` will have the first value
+    first, and all values can be retrieved with
+    :meth:`MultiDict.getlist`.
+
+    :param cookie: The cookie header as a string.
+    :param cls: A dict-like class to store the parsed cookies in.
+        Defaults to :class:`MultiDict`.
+
+    .. versionchanged:: 3.0
+        Passing bytes, and the ``charset`` and ``errors`` parameters, were removed.
+
+    .. versionadded:: 2.2
+    """
+    if cls is None:
+        cls = t.cast("type[ds.MultiDict[str, str]]", ds.MultiDict)
+
+    if not cookie:
+        return cls()
+
+    cookie = f"{cookie};"
+    out = []
+
+    for ck, cv in _cookie_re.findall(cookie):
+        ck = ck.strip()
+        cv = cv.strip()
+
+        if not ck:
+            continue
+
+        if len(cv) >= 2 and cv[0] == cv[-1] == '"':
+            # Work with bytes here, since a UTF-8 character could be multiple bytes.
+            cv = _cookie_unslash_re.sub(
+                _cookie_unslash_replace, cv[1:-1].encode()
+            ).decode(errors="replace")
+
+        out.append((ck, cv))
+
+    return cls(out)
+
+
+# circular dependencies
+from .. import datastructures as ds