72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
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from __future__ import annotations
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from typing import Any, cast
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from mcp.types import URL_ELICITATION_REQUIRED, ElicitRequestURLParams, ErrorData
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class McpError(Exception):
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"""
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Exception type raised when an error arrives over an MCP connection.
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"""
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error: ErrorData
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def __init__(self, error: ErrorData):
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"""Initialize McpError."""
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super().__init__(error.message)
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self.error = error
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class UrlElicitationRequiredError(McpError):
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"""
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Specialized error for when a tool requires URL mode elicitation(s) before proceeding.
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Servers can raise this error from tool handlers to indicate that the client
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must complete one or more URL elicitations before the request can be processed.
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Example:
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raise UrlElicitationRequiredError([
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ElicitRequestURLParams(
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mode="url",
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message="Authorization required for your files",
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url="https://example.com/oauth/authorize",
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elicitationId="auth-001"
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)
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])
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"""
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def __init__(
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self,
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elicitations: list[ElicitRequestURLParams],
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message: str | None = None,
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):
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"""Initialize UrlElicitationRequiredError."""
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if message is None:
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message = f"URL elicitation{'s' if len(elicitations) > 1 else ''} required"
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self._elicitations = elicitations
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error = ErrorData(
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code=URL_ELICITATION_REQUIRED,
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message=message,
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data={"elicitations": [e.model_dump(by_alias=True, exclude_none=True) for e in elicitations]},
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)
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super().__init__(error)
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@property
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def elicitations(self) -> list[ElicitRequestURLParams]:
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"""The list of URL elicitations required before the request can proceed."""
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return self._elicitations
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@classmethod
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def from_error(cls, error: ErrorData) -> UrlElicitationRequiredError:
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"""Reconstruct from an ErrorData received over the wire."""
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if error.code != URL_ELICITATION_REQUIRED:
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raise ValueError(f"Expected error code {URL_ELICITATION_REQUIRED}, got {error.code}")
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data = cast(dict[str, Any], error.data or {})
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raw_elicitations = cast(list[dict[str, Any]], data.get("elicitations", []))
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elicitations = [ElicitRequestURLParams.model_validate(e) for e in raw_elicitations]
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return cls(elicitations, error.message)
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