55 lines
2.1 KiB
Python
55 lines
2.1 KiB
Python
import argparse
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import sys
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import json
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import jsonschema
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import jsonschema.protocols
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import jsonschema.validators
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from jsonschema import Draft202012Validator
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from jsonschema.exceptions import SchemaError, ValidationError
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from referencing import Registry, Resource
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from referencing.jsonschema import DRAFT202012
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parser = argparse.ArgumentParser(
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description="Validate a JSON document against a JSON schema"
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)
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parser.add_argument("-f", "--file",
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help="file containing the JSON document to validate. " +
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"If absent, the JSON document is read from the standard input")
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parser.add_argument("-s", "--schema", required=True,
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help="file containing the schema definition"
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)
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parser.add_argument("-r", "--resource", nargs="+", default=[],
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help="additional schemas to be added to the registry for reference resolution")
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if __name__ == "__main__":
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args = parser.parse_args()
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# Load the schema and any additional resources and add them to the registry for reference resolution
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# The schema is last in the list: it will remain stored in schema_dict at the end of the for loop
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registry = Registry()
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for schema_file in (*args.resource, args.schema):
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with open(file=schema_file, mode="r") as f:
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schema = json.load(f)
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resource = Resource.from_contents(
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contents=schema,
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default_specification=DRAFT202012
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)
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registry = resource @ registry
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# Load the JSON document to validate
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with open(file=args.file, mode="r") if args.file else sys.stdin as f:
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document = json.load(f)
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# Set the validator with the desired schema and check the schema itself before validating the document
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validator = jsonschema.validators.validator_for(schema)(schema, registry=registry)
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try:
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validator.check_schema(schema)
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except SchemaError as e:
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print("Schema check failed.")
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print(f"{e.message}")
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exit(1)
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try:
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validator.validate(document)
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print("Valid!")
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except ValidationError as e:
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print("Validation failed.")
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print(f"{e.message}")
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exit(1)
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