django-rest-framework/djangorestframework/exceptions.py

"""
Handled exceptions raised by REST framework.

In addition Django's built in 403 and 404 exceptions are handled.
(`django.http.Http404` and `django.core.exceptions.PermissionDenied`)
"""
from djangorestframework import status


class ParseError(Exception):
    status_code = status.HTTP_400_BAD_REQUEST
    default_detail = 'Malformed request.'

    def __init__(self, detail=None):
        self.detail = detail or self.default_detail


class PermissionDenied(Exception):
    status_code = status.HTTP_403_FORBIDDEN
    default_detail = 'You do not have permission to access this resource.'

    def __init__(self, detail=None):
        self.detail = detail or self.default_detail


class MethodNotAllowed(Exception):
    status_code = status.HTTP_405_METHOD_NOT_ALLOWED
    default_detail = "Method '%s' not allowed."

    def __init__(self, method, detail=None):
        self.detail = (detail or self.default_detail) % method


class UnsupportedMediaType(Exception):
    status_code = status.HTTP_415_UNSUPPORTED_MEDIA_TYPE
    default_detail = "Unsupported media type '%s' in request."

    def __init__(self, media_type, detail=None):
        self.detail = (detail or self.default_detail) % media_type


class Throttled(Exception):
    status_code = status.HTTP_429_TOO_MANY_REQUESTS
    default_detail = "Request was throttled. Expected available in %d seconds."

    def __init__(self, wait, detail=None):
        import math
        self.detail = (detail or self.default_detail) % int(math.ceil(wait))


REST_FRAMEWORK_EXCEPTIONS = (
    ParseError, PermissionDenied, MethodNotAllowed,
    UnsupportedMediaType, Throttled
)