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120 lines
3.5 KiB
Python
120 lines
3.5 KiB
Python
from fastapi import status
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import typing as t
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from pydantic import BaseModel
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from django.core.exceptions import ValidationError as DjangoValidationError
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class HttpErrorField(BaseModel):
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field: str
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code: str
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detail: str
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class Config:
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orm_mode = True
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class HttpErrorOut(BaseModel):
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code: str
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detail: str
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errors: t.Optional[t.List[HttpErrorField]]
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class Config:
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orm_mode = True
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class CustomHttpException(Exception):
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def __init__(self, code: str, detail: str, status_code: int = status.HTTP_400_BAD_REQUEST):
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self.status_code = status_code
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self.code = code
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self.detail = detail
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@property
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def as_dict(self) -> dict:
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return {"code": self.code, "detail": self.detail}
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class AuthenticationFailed(CustomHttpException):
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def __init__(
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self,
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code="authentication_failed",
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detail: str = "Incorrect authentication credentials.",
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status_code: int = status.HTTP_401_UNAUTHORIZED,
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):
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super().__init__(code=code, detail=detail, status_code=status_code)
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class NotAuthenticated(CustomHttpException):
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def __init__(
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self,
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code="not_authenticated",
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detail: str = "Authentication credentials were not provided.",
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status_code: int = status.HTTP_401_UNAUTHORIZED,
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):
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super().__init__(code=code, detail=detail, status_code=status_code)
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class PermissionDenied(CustomHttpException):
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def __init__(
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self,
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code="permission_denied",
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detail: str = "You do not have permission to perform this action.",
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status_code: int = status.HTTP_403_FORBIDDEN,
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):
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super().__init__(code=code, detail=detail, status_code=status_code)
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class HttpError(CustomHttpException):
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def __init__(
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self,
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code: str,
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detail: str,
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status_code: int = status.HTTP_400_BAD_REQUEST,
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errors: t.Optional[t.List["HttpError"]] = None,
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):
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self.errors = errors
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super().__init__(code=code, detail=detail, status_code=status_code)
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@property
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def as_dict(self) -> dict:
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return HttpErrorOut(code=self.code, errors=self.errors, detail=self.detail).dict()
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class ValidationError(HttpError):
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def __init__(
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self,
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code: str,
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detail: str,
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status_code: int = status.HTTP_400_BAD_REQUEST,
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errors: t.Optional[t.List["HttpError"]] = None,
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field: t.Optional[str] = None,
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):
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self.field = field
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super().__init__(code=code, detail=detail, errors=errors, status_code=status_code)
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def flatten_errors(field_name: str, errors) -> t.List[HttpError]:
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ret: t.List[HttpError] = []
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if isinstance(errors, dict):
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for error_key in errors:
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error = errors[error_key]
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ret.extend(flatten_errors("{}.{}".format(field_name, error_key), error))
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else:
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for error in errors:
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if error.messages:
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message = error.messages[0]
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else:
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message = str(error)
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ret.append(ValidationError(code=error.code, detail=message, field=field_name))
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return ret
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def transform_validation_error(prefix: str, err: DjangoValidationError):
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if hasattr(err, "error_dict"):
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errors = flatten_errors(prefix, err.error_dict)
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elif not hasattr(err, "message"):
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errors = flatten_errors(prefix, err.error_list)
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else:
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raise HttpError(err.code or "validation_error", err.message)
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raise HttpError(code="field_errors", detail="Field validations failed.", errors=errors)
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