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"""JSON schemas and associated utilities."""
from os import path
import json
from typing import Mapping
from pkg_resources import resource_string
import jsonschema
def assert_valid(data: Mapping, schema_id: str) -> None:
"""Validate the given `data` against the specified `schema`.
:param data: Python dictionary to be validated as a JSON object.
:param schema_id: id property of the JSON schema to validate against. Must
be one of those listed in `the 0x JSON schema files
<https://github.com/0xProject/0x-monorepo/tree/development/packages/json-schemas/schemas>`_.
Raises an exception if validation fails.
>>> assert_valid(
... {'v': 27, 'r': '0x'+'f'*64, 's': '0x'+'f'*64},
... '/ECSignature',
... )
"""
# noqa
class LocalRefResolver(jsonschema.RefResolver):
"""Resolve package-local JSON schema id's."""
def __init__(self):
self.ref_to_file = {
"/addressSchema": "address_schema.json",
"/hexSchema": "hex_schema.json",
"/orderSchema": "order_schema.json",
"/wholeNumberSchema": "whole_number_schema.json",
"/ECSignature": "ec_signature_schema.json",
"/ecSignatureParameterSchema": (
"ec_signature_parameter_schema.json" + ""
),
}
jsonschema.RefResolver.__init__(self, "", "")
def resolve_from_url(self, url):
"""Resolve the given URL."""
ref = url.replace("file://", "")
if ref in self.ref_to_file:
return json.loads(
resource_string(
"zero_ex.json_schemas",
f"schemas/{self.ref_to_file[ref]}",
)
)
raise jsonschema.ValidationError(
f"Unknown ref '{ref}'. "
+ f"Known refs: {list(self.ref_to_file.keys())}."
)
resolver = LocalRefResolver()
jsonschema.validate(
data, resolver.resolve_from_url(schema_id), resolver=resolver
)
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