262 lines
7.1 KiB
Python
262 lines
7.1 KiB
Python
from __future__ import annotations
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import re
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import typing as t
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import uuid
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from urllib.parse import quote
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if t.TYPE_CHECKING:
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from .map import Map
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class ValidationError(ValueError):
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"""Validation error. If a rule converter raises this exception the rule
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does not match the current URL and the next URL is tried.
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"""
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class BaseConverter:
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"""Base class for all converters.
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.. versionchanged:: 2.3
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``part_isolating`` defaults to ``False`` if ``regex`` contains a ``/``.
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"""
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regex = "[^/]+"
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weight = 100
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part_isolating = True
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def __init_subclass__(cls, **kwargs: t.Any) -> None:
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super().__init_subclass__(**kwargs)
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# If the converter isn't inheriting its regex, disable part_isolating by default
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# if the regex contains a / character.
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if "regex" in cls.__dict__ and "part_isolating" not in cls.__dict__:
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cls.part_isolating = "/" not in cls.regex
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def __init__(self, map: Map, *args: t.Any, **kwargs: t.Any) -> None:
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self.map = map
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def to_python(self, value: str) -> t.Any:
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return value
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def to_url(self, value: t.Any) -> str:
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# safe = https://url.spec.whatwg.org/#url-path-segment-string
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return quote(str(value), safe="!$&'()*+,/:;=@")
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class UnicodeConverter(BaseConverter):
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"""This converter is the default converter and accepts any string but
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only one path segment. Thus the string can not include a slash.
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This is the default validator.
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Example::
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Rule('/pages/<page>'),
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Rule('/<string(length=2):lang_code>')
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:param map: the :class:`Map`.
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:param minlength: the minimum length of the string. Must be greater
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or equal 1.
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:param maxlength: the maximum length of the string.
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:param length: the exact length of the string.
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"""
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def __init__(
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self,
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map: Map,
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minlength: int = 1,
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maxlength: int | None = None,
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length: int | None = None,
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) -> None:
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super().__init__(map)
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if length is not None:
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length_regex = f"{{{int(length)}}}"
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else:
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if maxlength is None:
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maxlength_value = ""
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else:
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maxlength_value = str(int(maxlength))
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length_regex = f"{{{int(minlength)},{maxlength_value}}}"
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self.regex = f"[^/]{length_regex}"
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class AnyConverter(BaseConverter):
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"""Matches one of the items provided. Items can either be Python
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identifiers or strings::
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Rule('/<any(about, help, imprint, class, "foo,bar"):page_name>')
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:param map: the :class:`Map`.
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:param items: this function accepts the possible items as positional
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arguments.
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.. versionchanged:: 2.2
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Value is validated when building a URL.
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"""
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def __init__(self, map: Map, *items: str) -> None:
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super().__init__(map)
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self.items = set(items)
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self.regex = f"(?:{'|'.join([re.escape(x) for x in items])})"
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def to_url(self, value: t.Any) -> str:
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if value in self.items:
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return str(value)
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valid_values = ", ".join(f"'{item}'" for item in sorted(self.items))
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raise ValueError(f"'{value}' is not one of {valid_values}")
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class PathConverter(BaseConverter):
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"""Like the default :class:`UnicodeConverter`, but it also matches
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slashes. This is useful for wikis and similar applications::
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Rule('/<path:wikipage>')
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Rule('/<path:wikipage>/edit')
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:param map: the :class:`Map`.
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"""
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part_isolating = False
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regex = "[^/].*?"
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weight = 200
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class NumberConverter(BaseConverter):
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"""Baseclass for `IntegerConverter` and `FloatConverter`.
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:internal:
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"""
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weight = 50
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num_convert: t.Callable[[t.Any], t.Any] = int
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def __init__(
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self,
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map: Map,
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fixed_digits: int = 0,
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min: int | None = None,
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max: int | None = None,
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signed: bool = False,
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) -> None:
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if signed:
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self.regex = self.signed_regex
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super().__init__(map)
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self.fixed_digits = fixed_digits
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self.min = min
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self.max = max
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self.signed = signed
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def to_python(self, value: str) -> t.Any:
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if self.fixed_digits and len(value) != self.fixed_digits:
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raise ValidationError()
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value_num = self.num_convert(value)
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if (self.min is not None and value_num < self.min) or (
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self.max is not None and value_num > self.max
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):
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raise ValidationError()
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return value_num
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def to_url(self, value: t.Any) -> str:
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value_str = str(self.num_convert(value))
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if self.fixed_digits:
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value_str = value_str.zfill(self.fixed_digits)
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return value_str
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@property
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def signed_regex(self) -> str:
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return f"-?{self.regex}"
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class IntegerConverter(NumberConverter):
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"""This converter only accepts integer values::
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Rule("/page/<int:page>")
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By default it only accepts unsigned, positive values. The ``signed``
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parameter will enable signed, negative values. ::
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Rule("/page/<int(signed=True):page>")
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:param map: The :class:`Map`.
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:param fixed_digits: The number of fixed digits in the URL. If you
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set this to ``4`` for example, the rule will only match if the
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URL looks like ``/0001/``. The default is variable length.
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:param min: The minimal value.
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:param max: The maximal value.
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:param signed: Allow signed (negative) values.
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.. versionadded:: 0.15
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The ``signed`` parameter.
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"""
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regex = r"\d+"
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class FloatConverter(NumberConverter):
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"""This converter only accepts floating point values::
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Rule("/probability/<float:probability>")
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By default it only accepts unsigned, positive values. The ``signed``
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parameter will enable signed, negative values. ::
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Rule("/offset/<float(signed=True):offset>")
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:param map: The :class:`Map`.
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:param min: The minimal value.
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:param max: The maximal value.
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:param signed: Allow signed (negative) values.
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.. versionadded:: 0.15
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The ``signed`` parameter.
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"""
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regex = r"\d+\.\d+"
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num_convert = float
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def __init__(
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self,
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map: Map,
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min: float | None = None,
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max: float | None = None,
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signed: bool = False,
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) -> None:
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super().__init__(map, min=min, max=max, signed=signed) # type: ignore
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class UUIDConverter(BaseConverter):
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"""This converter only accepts UUID strings::
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Rule('/object/<uuid:identifier>')
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.. versionadded:: 0.10
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:param map: the :class:`Map`.
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"""
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regex = (
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r"[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-"
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r"[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}"
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)
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def to_python(self, value: str) -> uuid.UUID:
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return uuid.UUID(value)
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def to_url(self, value: uuid.UUID) -> str:
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return str(value)
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#: the default converter mapping for the map.
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DEFAULT_CONVERTERS: t.Mapping[str, type[BaseConverter]] = {
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"default": UnicodeConverter,
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"string": UnicodeConverter,
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"any": AnyConverter,
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"path": PathConverter,
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"int": IntegerConverter,
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"float": FloatConverter,
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"uuid": UUIDConverter,
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}
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