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721 lines
23 KiB
Python
721 lines
23 KiB
Python
"""
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This module sets up a scheme for validating that arbitrary Python
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objects are correctly typed. It is totally decoupled from Django,
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composable, easily wrapped, and easily extended.
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A validator takes two parameters--var_name and val--and raises an
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error if val is not the correct type. The var_name parameter is used
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to format error messages. Validators return the validated value when
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there are no errors.
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Example primitive validators are check_string, check_int, and check_bool.
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Compound validators are created by check_list and check_dict. Note that
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those functions aren't directly called for validation; instead, those
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functions are called to return other functions that adhere to the validator
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contract. This is similar to how Python decorators are often parameterized.
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The contract for check_list and check_dict is that they get passed in other
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validators to apply to their items. This allows you to build up validators
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for arbitrarily complex validators. See ValidatorTestCase for example usage.
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A simple example of composition is this:
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check_list(check_string)('my_list', ['a', 'b', 'c'])
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To extend this concept, it's simply a matter of writing your own validator
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for any particular type of object.
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"""
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from collections.abc import Collection, Container, Iterator
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from dataclasses import dataclass
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from datetime import datetime, timezone
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from typing import Any, NoReturn, TypeVar, cast, overload
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import orjson
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from django.core.exceptions import ValidationError
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from django.core.validators import URLValidator, validate_email
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from django.utils.translation import gettext as _
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from pydantic import ValidationInfo, model_validator
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from pydantic.functional_validators import ModelWrapValidatorHandler
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from typing_extensions import override
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from zerver.lib.exceptions import InvalidJSONError, JsonableError
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from zerver.lib.types import ProfileFieldData, Validator
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ResultT = TypeVar("ResultT")
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def check_anything(var_name: str, val: object) -> object:
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return val
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def check_string(var_name: str, val: object) -> str:
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if not isinstance(val, str):
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raise ValidationError(_("{var_name} is not a string").format(var_name=var_name))
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return val
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def check_required_string(var_name: str, val: object) -> str:
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s = check_string(var_name, val)
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if not s.strip():
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raise ValidationError(_("{item} cannot be blank.").format(item=var_name))
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return s
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def check_string_in(possible_values: Container[str]) -> Validator[str]:
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def validator(var_name: str, val: object) -> str:
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s = check_string(var_name, val)
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if s not in possible_values:
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raise ValidationError(_("Invalid {var_name}").format(var_name=var_name))
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return s
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return validator
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def check_short_string(var_name: str, val: object) -> str:
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return check_capped_string(50)(var_name, val)
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def check_capped_string(max_length: int) -> Validator[str]:
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def validator(var_name: str, val: object) -> str:
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s = check_string(var_name, val)
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if len(s) > max_length:
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raise ValidationError(
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_("{var_name} is too long (limit: {max_length} characters)").format(
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var_name=var_name,
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max_length=max_length,
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)
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)
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return s
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return validator
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def check_string_fixed_length(length: int) -> Validator[str]:
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def validator(var_name: str, val: object) -> str:
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s = check_string(var_name, val)
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if len(s) != length:
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raise ValidationError(
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_("{var_name} has incorrect length {length}; should be {target_length}").format(
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var_name=var_name,
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target_length=length,
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length=len(s),
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)
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)
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return s
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return validator
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def check_long_string(var_name: str, val: object) -> str:
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return check_capped_string(500)(var_name, val)
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def check_date(var_name: str, val: object) -> str:
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if not isinstance(val, str):
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raise ValidationError(_("{var_name} is not a string").format(var_name=var_name))
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try:
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if (
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datetime.strptime(val, "%Y-%m-%d").replace(tzinfo=timezone.utc).strftime("%Y-%m-%d")
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!= val
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):
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raise ValidationError(_("{var_name} is not a date").format(var_name=var_name))
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except ValueError:
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raise ValidationError(_("{var_name} is not a date").format(var_name=var_name))
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return val
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def check_int(var_name: str, val: object) -> int:
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if not isinstance(val, int):
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raise ValidationError(_("{var_name} is not an integer").format(var_name=var_name))
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return val
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def check_int_in(possible_values: list[int]) -> Validator[int]:
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"""
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Assert that the input is an integer and is contained in `possible_values`. If the input is not in
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`possible_values`, a `ValidationError` is raised containing the failing field's name.
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"""
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def validator(var_name: str, val: object) -> int:
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n = check_int(var_name, val)
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if n not in possible_values:
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raise ValidationError(_("Invalid {var_name}").format(var_name=var_name))
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return n
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return validator
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def check_int_range(low: int, high: int) -> Validator[int]:
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# low and high are both treated as valid values
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def validator(var_name: str, val: object) -> int:
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n = check_int(var_name, val)
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if n < low:
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raise ValidationError(_("{var_name} is too small").format(var_name=var_name))
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if n > high:
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raise ValidationError(_("{var_name} is too large").format(var_name=var_name))
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return n
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return validator
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def check_float(var_name: str, val: object) -> float:
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if not isinstance(val, float):
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raise ValidationError(_("{var_name} is not a float").format(var_name=var_name))
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return val
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def check_bool(var_name: str, val: object) -> bool:
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if not isinstance(val, bool):
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raise ValidationError(_("{var_name} is not a boolean").format(var_name=var_name))
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return val
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def check_none_or(sub_validator: Validator[ResultT]) -> Validator[ResultT | None]:
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def f(var_name: str, val: object) -> ResultT | None:
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if val is None:
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return val
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else:
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return sub_validator(var_name, val)
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return f
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def check_list(
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sub_validator: Validator[ResultT], length: int | None = None
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) -> Validator[list[ResultT]]:
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def f(var_name: str, val: object) -> list[ResultT]:
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if not isinstance(val, list):
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raise ValidationError(_("{var_name} is not a list").format(var_name=var_name))
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if length is not None and length != len(val):
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raise ValidationError(
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_("{container} should have exactly {length} items").format(
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container=var_name,
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length=length,
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)
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)
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for i, item in enumerate(val):
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vname = f"{var_name}[{i}]"
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valid_item = sub_validator(vname, item)
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assert item is valid_item # To justify the unchecked cast below
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return cast(list[ResultT], val)
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return f
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# https://zulip.readthedocs.io/en/latest/testing/mypy.html#using-overload-to-accurately-describe-variations
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@overload
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def check_dict(
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required_keys: Collection[tuple[str, Validator[object]]] = [],
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optional_keys: Collection[tuple[str, Validator[object]]] = [],
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*,
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_allow_only_listed_keys: bool = False,
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) -> Validator[dict[str, object]]: ...
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@overload
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def check_dict(
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required_keys: Collection[tuple[str, Validator[ResultT]]] = [],
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optional_keys: Collection[tuple[str, Validator[ResultT]]] = [],
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*,
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value_validator: Validator[ResultT],
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_allow_only_listed_keys: bool = False,
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) -> Validator[dict[str, ResultT]]: ...
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def check_dict(
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required_keys: Collection[tuple[str, Validator[ResultT]]] = [],
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optional_keys: Collection[tuple[str, Validator[ResultT]]] = [],
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*,
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value_validator: Validator[ResultT] | None = None,
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_allow_only_listed_keys: bool = False,
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) -> Validator[dict[str, ResultT]]:
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def f(var_name: str, val: object) -> dict[str, ResultT]:
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if not isinstance(val, dict):
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raise ValidationError(_("{var_name} is not a dict").format(var_name=var_name))
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for k in val:
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check_string(f"{var_name} key", k)
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for k, sub_validator in required_keys:
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if k not in val:
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raise ValidationError(
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_("{key_name} key is missing from {var_name}").format(
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key_name=k,
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var_name=var_name,
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)
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)
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vname = f'{var_name}["{k}"]'
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sub_validator(vname, val[k])
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for k, sub_validator in optional_keys:
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if k in val:
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vname = f'{var_name}["{k}"]'
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sub_validator(vname, val[k])
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if value_validator:
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for key in val:
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vname = f"{var_name} contains a value that"
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valid_value = value_validator(vname, val[key])
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assert val[key] is valid_value # To justify the unchecked cast below
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if _allow_only_listed_keys:
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required_keys_set = {x[0] for x in required_keys}
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optional_keys_set = {x[0] for x in optional_keys}
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delta_keys = set(val.keys()) - required_keys_set - optional_keys_set
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if len(delta_keys) != 0:
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raise ValidationError(
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_("Unexpected arguments: {keys}").format(keys=", ".join(delta_keys))
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)
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return cast(dict[str, ResultT], val)
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return f
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def check_dict_only(
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required_keys: Collection[tuple[str, Validator[ResultT]]],
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optional_keys: Collection[tuple[str, Validator[ResultT]]] = [],
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) -> Validator[dict[str, ResultT]]:
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return cast(
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Validator[dict[str, ResultT]],
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check_dict(required_keys, optional_keys, _allow_only_listed_keys=True),
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)
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def check_union(allowed_type_funcs: Collection[Validator[ResultT]]) -> Validator[ResultT]:
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"""
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Use this validator if an argument is of a variable type (e.g. processing
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properties that might be strings or booleans).
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`allowed_type_funcs`: the check_* validator functions for the possible data
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types for this variable.
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"""
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def enumerated_type_check(var_name: str, val: object) -> ResultT:
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for func in allowed_type_funcs:
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try:
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return func(var_name, val)
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except ValidationError:
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pass
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raise ValidationError(_("{var_name} is not an allowed_type").format(var_name=var_name))
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return enumerated_type_check
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def equals(expected_val: ResultT) -> Validator[ResultT]:
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def f(var_name: str, val: object) -> ResultT:
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if val != expected_val:
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raise ValidationError(
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_("{variable} != {expected_value} ({value} is wrong)").format(
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variable=var_name,
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expected_value=expected_val,
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value=val,
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)
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)
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return cast(ResultT, val)
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return f
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def validate_login_email(email: str) -> None:
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try:
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validate_email(email)
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except ValidationError as err:
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raise JsonableError(str(err.message))
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def check_url(var_name: str, val: object) -> str:
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# First, ensure val is a string
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s = check_string(var_name, val)
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# Now, validate as URL
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validate = URLValidator()
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try:
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validate(s)
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return s
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except ValidationError:
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raise ValidationError(_("{var_name} is not a URL").format(var_name=var_name))
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def check_capped_url(max_length: int) -> Validator[str]:
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def validator(var_name: str, val: object) -> str:
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# Ensure val is a string and length of the string does not
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# exceed max_length.
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s = check_capped_string(max_length)(var_name, val)
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# Validate as URL.
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validate = URLValidator()
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try:
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validate(s)
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return s
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except ValidationError:
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raise ValidationError(_("{var_name} is not a URL").format(var_name=var_name))
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return validator
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def check_external_account_url_pattern(var_name: str, val: object) -> str:
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s = check_string(var_name, val)
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if s.count("%(username)s") != 1:
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raise ValidationError(_("URL pattern must contain '%(username)s'."))
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url_val = s.replace("%(username)s", "username")
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check_url(var_name, url_val)
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return s
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def validate_select_field_data(field_data: ProfileFieldData) -> dict[str, dict[str, str]]:
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"""
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This function is used to validate the data sent to the server while
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creating/editing choices of the choice field in Organization settings.
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"""
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validator = check_dict_only(
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[
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("text", check_required_string),
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("order", check_required_string),
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]
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)
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# To create an array of texts of each option
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distinct_field_names: set[str] = set()
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for key, value in field_data.items():
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if not key.strip():
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raise ValidationError(_("'{item}' cannot be blank.").format(item="value"))
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valid_value = validator("field_data", value)
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assert value is valid_value # To justify the unchecked cast below
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distinct_field_names.add(valid_value["text"])
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# To show error if the options are duplicate
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if len(field_data) != len(distinct_field_names):
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raise ValidationError(_("Field must not have duplicate choices."))
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return cast(dict[str, dict[str, str]], field_data)
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|
|
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def validate_select_field(var_name: str, field_data: str, value: object) -> str:
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"""
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This function is used to validate the value selected by the user against a
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choice field. This is not used to validate admin data.
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"""
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s = check_string(var_name, value)
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field_data_dict = orjson.loads(field_data)
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if s not in field_data_dict:
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msg = _("'{value}' is not a valid choice for '{field_name}'.")
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raise ValidationError(msg.format(value=value, field_name=var_name))
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return s
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|
|
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def check_widget_content(widget_content: object) -> dict[str, Any]:
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if not isinstance(widget_content, dict):
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raise ValidationError("widget_content is not a dict")
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if "widget_type" not in widget_content:
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raise ValidationError("widget_type is not in widget_content")
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if "extra_data" not in widget_content:
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raise ValidationError("extra_data is not in widget_content")
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widget_type = widget_content["widget_type"]
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extra_data = widget_content["extra_data"]
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if not isinstance(extra_data, dict):
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raise ValidationError("extra_data is not a dict")
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if widget_type == "zform":
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if "type" not in extra_data:
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raise ValidationError("zform is missing type field")
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|
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if extra_data["type"] == "choices":
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check_choices = check_list(
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check_dict(
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[
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("short_name", check_string),
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|
("long_name", check_string),
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|
("reply", check_string),
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|
]
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|
),
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)
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|
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|
# We re-check "type" here just to avoid it looking
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# like we have extraneous keys.
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checker = check_dict(
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[
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("type", equals("choices")),
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("heading", check_string),
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|
("choices", check_choices),
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|
]
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)
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|
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|
checker("extra_data", extra_data)
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|
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|
return widget_content
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|
|
|
raise ValidationError("unknown zform type: " + extra_data["type"])
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|
|
|
raise ValidationError("unknown widget type: " + widget_type)
|
|
|
|
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|
# This should match MAX_IDX in our client widgets. It is somewhat arbitrary.
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|
MAX_IDX = 1000
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|
|
|
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|
def validate_poll_data(poll_data: object, is_widget_author: bool) -> None:
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|
check_dict([("type", check_string)])("poll data", poll_data)
|
|
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|
assert isinstance(poll_data, dict)
|
|
|
|
if poll_data["type"] == "vote":
|
|
checker = check_dict_only(
|
|
[
|
|
("type", check_string),
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|
("key", check_string),
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|
("vote", check_int_in([1, -1])),
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|
]
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|
)
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|
checker("poll data", poll_data)
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|
return
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|
|
|
if poll_data["type"] == "question":
|
|
if not is_widget_author:
|
|
raise ValidationError("You can't edit a question unless you are the author.")
|
|
|
|
checker = check_dict_only(
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|
[
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|
("type", check_string),
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|
("question", check_string),
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|
]
|
|
)
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|
checker("poll data", poll_data)
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|
return
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|
|
|
if poll_data["type"] == "new_option":
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|
checker = check_dict_only(
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|
[
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|
("type", check_string),
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|
("option", check_string),
|
|
("idx", check_int_range(0, MAX_IDX)),
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|
]
|
|
)
|
|
checker("poll data", poll_data)
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|
return
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|
|
|
raise ValidationError(f"Unknown type for poll data: {poll_data['type']}")
|
|
|
|
|
|
def validate_todo_data(todo_data: object, is_widget_author: bool) -> None:
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|
check_dict([("type", check_string)])("todo data", todo_data)
|
|
|
|
assert isinstance(todo_data, dict)
|
|
|
|
if todo_data["type"] == "new_task":
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|
checker = check_dict_only(
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|
[
|
|
("type", check_string),
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|
("key", check_int_range(0, MAX_IDX)),
|
|
("task", check_string),
|
|
("desc", check_string),
|
|
("completed", check_bool),
|
|
]
|
|
)
|
|
checker("todo data", todo_data)
|
|
return
|
|
|
|
if todo_data["type"] == "strike":
|
|
checker = check_dict_only(
|
|
[
|
|
("type", check_string),
|
|
("key", check_string),
|
|
]
|
|
)
|
|
checker("todo data", todo_data)
|
|
return
|
|
|
|
if todo_data["type"] == "new_task_list_title":
|
|
if not is_widget_author:
|
|
raise ValidationError("You can't edit the task list title unless you are the author.")
|
|
|
|
checker = check_dict_only(
|
|
[
|
|
("type", check_string),
|
|
("title", check_string),
|
|
]
|
|
)
|
|
checker("todo data", todo_data)
|
|
return
|
|
|
|
raise ValidationError(f"Unknown type for todo data: {todo_data['type']}")
|
|
|
|
|
|
def check_string_or_int_list(var_name: str, val: object) -> str | list[int]:
|
|
if isinstance(val, str):
|
|
return val
|
|
|
|
if not isinstance(val, list):
|
|
raise ValidationError(
|
|
_("{var_name} is not a string or an integer list").format(var_name=var_name)
|
|
)
|
|
|
|
return check_list(check_int)(var_name, val)
|
|
|
|
|
|
def check_string_or_int(var_name: str, val: object) -> str | int:
|
|
if isinstance(val, str | int):
|
|
return val
|
|
|
|
raise ValidationError(_("{var_name} is not a string or integer").format(var_name=var_name))
|
|
|
|
|
|
@dataclass(eq=False)
|
|
class WildValue: # noqa: PLW1641
|
|
var_name: str
|
|
value: object
|
|
|
|
@model_validator(mode="wrap")
|
|
@classmethod
|
|
def to_wild_value(
|
|
cls,
|
|
value: object,
|
|
# We bypass the original WildValue handler to customize it
|
|
handler: ModelWrapValidatorHandler["WildValue"],
|
|
info: ValidationInfo,
|
|
) -> "WildValue":
|
|
return wrap_wild_value("request", value)
|
|
|
|
def __bool__(self) -> bool:
|
|
return bool(self.value)
|
|
|
|
@override
|
|
def __eq__(self, other: object) -> bool:
|
|
raise TypeError("cannot compare WildValue")
|
|
|
|
def __len__(self) -> int:
|
|
if not isinstance(self.value, dict | list | str):
|
|
raise ValidationError(
|
|
_("{var_name} does not have a length").format(var_name=self.var_name)
|
|
)
|
|
return len(self.value)
|
|
|
|
@override
|
|
def __str__(self) -> NoReturn:
|
|
raise TypeError("cannot convert WildValue to string; try .tame(check_string)")
|
|
|
|
def _need_list(self) -> NoReturn:
|
|
raise ValidationError(_("{var_name} is not a list").format(var_name=self.var_name))
|
|
|
|
def _need_dict(self) -> NoReturn:
|
|
raise ValidationError(_("{var_name} is not a dict").format(var_name=self.var_name))
|
|
|
|
def __iter__(self) -> Iterator["WildValue"]:
|
|
self._need_list()
|
|
|
|
def __contains__(self, key: str) -> bool:
|
|
self._need_dict()
|
|
|
|
def __getitem__(self, key: int | str) -> "WildValue":
|
|
if isinstance(key, int):
|
|
self._need_list()
|
|
else:
|
|
self._need_dict()
|
|
|
|
def get(self, key: str, default: object = None) -> "WildValue":
|
|
self._need_dict()
|
|
|
|
def keys(self) -> Iterator[str]:
|
|
self._need_dict()
|
|
|
|
def values(self) -> Iterator["WildValue"]:
|
|
self._need_dict()
|
|
|
|
def items(self) -> Iterator[tuple[str, "WildValue"]]:
|
|
self._need_dict()
|
|
|
|
def tame(self, validator: Validator[ResultT]) -> ResultT:
|
|
return validator(self.var_name, self.value)
|
|
|
|
|
|
class WildValueList(WildValue):
|
|
value: list[object]
|
|
|
|
@override
|
|
def __iter__(self) -> Iterator[WildValue]:
|
|
for i, item in enumerate(self.value):
|
|
yield wrap_wild_value(f"{self.var_name}[{i}]", item)
|
|
|
|
@override
|
|
def __getitem__(self, key: int | str) -> WildValue:
|
|
if not isinstance(key, int):
|
|
return super().__getitem__(key)
|
|
|
|
var_name = f"{self.var_name}[{key!r}]"
|
|
|
|
try:
|
|
item = self.value[key]
|
|
except IndexError:
|
|
raise ValidationError(_("{var_name} is missing").format(var_name=var_name)) from None
|
|
|
|
return wrap_wild_value(var_name, item)
|
|
|
|
|
|
class WildValueDict(WildValue):
|
|
value: dict[str, object]
|
|
|
|
@override
|
|
def __contains__(self, key: str) -> bool:
|
|
return key in self.value
|
|
|
|
@override
|
|
def __getitem__(self, key: int | str) -> WildValue:
|
|
if not isinstance(key, str):
|
|
return super().__getitem__(key)
|
|
|
|
var_name = f"{self.var_name}[{key!r}]"
|
|
|
|
try:
|
|
item = self.value[key]
|
|
except KeyError:
|
|
raise ValidationError(_("{var_name} is missing").format(var_name=var_name)) from None
|
|
|
|
return wrap_wild_value(var_name, item)
|
|
|
|
@override
|
|
def get(self, key: str, default: object = None) -> WildValue:
|
|
item = self.value.get(key, default)
|
|
if isinstance(item, WildValue):
|
|
return item
|
|
return wrap_wild_value(f"{self.var_name}[{key!r}]", item)
|
|
|
|
@override
|
|
def keys(self) -> Iterator[str]:
|
|
yield from self.value.keys()
|
|
|
|
@override
|
|
def values(self) -> Iterator[WildValue]:
|
|
for key, value in self.value.items():
|
|
yield wrap_wild_value(f"{self.var_name}[{key!r}]", value)
|
|
|
|
@override
|
|
def items(self) -> Iterator[tuple[str, WildValue]]:
|
|
for key, value in self.value.items():
|
|
yield key, wrap_wild_value(f"{self.var_name}[{key!r}]", value)
|
|
|
|
|
|
def wrap_wild_value(var_name: str, value: object) -> WildValue:
|
|
if isinstance(value, list):
|
|
return WildValueList(var_name, value)
|
|
if isinstance(value, dict):
|
|
return WildValueDict(var_name, value)
|
|
return WildValue(var_name, value)
|
|
|
|
|
|
def to_wild_value(var_name: str, input: str) -> WildValue:
|
|
try:
|
|
value = orjson.loads(input)
|
|
except orjson.JSONDecodeError:
|
|
raise InvalidJSONError(_("Malformed JSON"))
|
|
|
|
return wrap_wild_value(var_name, value)
|