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74 lines
2.6 KiB
74 lines
2.6 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 datetime import datetime
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from cronsim import CronSim
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from pytz import all_timezones
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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, str):
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raise ValidationError("%s is not a string" % obj_name)
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if "minLength" in schema and len(obj) < schema["minLength"]:
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raise ValidationError("%s is too short" % obj_name)
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if "maxLength" in schema and len(obj) > schema["maxLength"]:
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raise ValidationError("%s is too long" % obj_name)
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if schema.get("format") == "cron":
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try:
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# Does it have 5 components?
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if len(obj.split()) != 5:
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raise ValueError()
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# Does cronsim accept the schedule?
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it = CronSim(obj, datetime(2000, 1, 1))
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# Can it calculate the next datetime?
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next(it)
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except:
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raise ValidationError("%s is not a valid cron expression" % obj_name)
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if schema.get("format") == "timezone" and obj not in all_timezones:
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raise ValidationError("%s is not a valid timezone" % 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") == "boolean":
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if not isinstance(obj, bool):
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raise ValidationError("%s is not a boolean" % 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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properties = schema.get("properties", {})
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for key, spec in 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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for key in schema.get("required", []):
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if key not in obj:
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raise ValidationError("key %s absent in %s" % (key, obj_name))
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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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