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44 lines
1.4 KiB
44 lines
1.4 KiB
""" A minimal jsonschema validator.
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Supports only a tiny subset of jsonschema.
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"""
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from six import string_types
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class ValidationError(Exception):
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pass
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def validate(obj, schema, obj_name="value"):
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if schema.get("type") == "string":
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if not isinstance(obj, string_types):
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raise ValidationError("%s is not a string" % obj_name)
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elif schema.get("type") == "number":
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if not isinstance(obj, int):
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raise ValidationError("%s is not a number" % obj_name)
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if "minimum" in schema and obj < schema["minimum"]:
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raise ValidationError("%s is too small" % obj_name)
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if "maximum" in schema and obj > schema["maximum"]:
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raise ValidationError("%s is too large" % obj_name)
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elif schema.get("type") == "array":
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if not isinstance(obj, list):
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raise ValidationError("%s is not an array" % obj_name)
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for v in obj:
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validate(v, schema["items"], "an item in '%s'" % obj_name)
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elif schema.get("type") == "object":
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if not isinstance(obj, dict):
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raise ValidationError("%s is not an object" % obj_name)
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for key, spec in schema["properties"].items():
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if key in obj:
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validate(obj[key], spec, obj_name=key)
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if "enum" in schema:
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if obj not in schema["enum"]:
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raise ValidationError("%s has unexpected value" % obj_name)
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