147 lines
4.6 KiB
Python
147 lines
4.6 KiB
Python
import difflib
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import typing as t
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from ..exceptions import BadRequest
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from ..exceptions import HTTPException
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from ..utils import cached_property
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from ..utils import redirect
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if t.TYPE_CHECKING:
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from _typeshed.wsgi import WSGIEnvironment
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from .map import MapAdapter
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from .rules import Rule # noqa: F401
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from ..wrappers.request import Request
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from ..wrappers.response import Response
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class RoutingException(Exception):
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"""Special exceptions that require the application to redirect, notifying
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about missing urls, etc.
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:internal:
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"""
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class RequestRedirect(HTTPException, RoutingException):
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"""Raise if the map requests a redirect. This is for example the case if
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`strict_slashes` are activated and an url that requires a trailing slash.
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The attribute `new_url` contains the absolute destination url.
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"""
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code = 308
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def __init__(self, new_url: str) -> None:
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super().__init__(new_url)
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self.new_url = new_url
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def get_response(
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self,
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environ: t.Optional[t.Union["WSGIEnvironment", "Request"]] = None,
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scope: t.Optional[dict] = None,
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) -> "Response":
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return redirect(self.new_url, self.code)
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class RequestPath(RoutingException):
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"""Internal exception."""
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__slots__ = ("path_info",)
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def __init__(self, path_info: str) -> None:
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super().__init__()
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self.path_info = path_info
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class RequestAliasRedirect(RoutingException): # noqa: B903
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"""This rule is an alias and wants to redirect to the canonical URL."""
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def __init__(self, matched_values: t.Mapping[str, t.Any], endpoint: str) -> None:
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super().__init__()
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self.matched_values = matched_values
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self.endpoint = endpoint
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class BuildError(RoutingException, LookupError):
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"""Raised if the build system cannot find a URL for an endpoint with the
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values provided.
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"""
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def __init__(
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self,
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endpoint: str,
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values: t.Mapping[str, t.Any],
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method: t.Optional[str],
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adapter: t.Optional["MapAdapter"] = None,
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) -> None:
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super().__init__(endpoint, values, method)
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self.endpoint = endpoint
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self.values = values
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self.method = method
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self.adapter = adapter
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@cached_property
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def suggested(self) -> t.Optional["Rule"]:
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return self.closest_rule(self.adapter)
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def closest_rule(self, adapter: t.Optional["MapAdapter"]) -> t.Optional["Rule"]:
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def _score_rule(rule: "Rule") -> float:
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return sum(
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[
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0.98
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* difflib.SequenceMatcher(
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None, rule.endpoint, self.endpoint
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).ratio(),
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0.01 * bool(set(self.values or ()).issubset(rule.arguments)),
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0.01 * bool(rule.methods and self.method in rule.methods),
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]
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)
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if adapter and adapter.map._rules:
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return max(adapter.map._rules, key=_score_rule)
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return None
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def __str__(self) -> str:
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message = [f"Could not build url for endpoint {self.endpoint!r}"]
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if self.method:
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message.append(f" ({self.method!r})")
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if self.values:
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message.append(f" with values {sorted(self.values)!r}")
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message.append(".")
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if self.suggested:
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if self.endpoint == self.suggested.endpoint:
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if (
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self.method
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and self.suggested.methods is not None
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and self.method not in self.suggested.methods
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):
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message.append(
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" Did you mean to use methods"
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f" {sorted(self.suggested.methods)!r}?"
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)
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missing_values = self.suggested.arguments.union(
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set(self.suggested.defaults or ())
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) - set(self.values.keys())
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if missing_values:
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message.append(
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f" Did you forget to specify values {sorted(missing_values)!r}?"
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)
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else:
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message.append(f" Did you mean {self.suggested.endpoint!r} instead?")
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return "".join(message)
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class WebsocketMismatch(BadRequest):
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"""The only matched rule is either a WebSocket and the request is
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HTTP, or the rule is HTTP and the request is a WebSocket.
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"""
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class NoMatch(Exception):
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__slots__ = ("have_match_for", "websocket_mismatch")
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def __init__(self, have_match_for: t.Set[str], websocket_mismatch: bool) -> None:
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self.have_match_for = have_match_for
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self.websocket_mismatch = websocket_mismatch
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