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""" A minimal jsonschema validator.
Supports only a tiny subset of jsonschema.
"""
from croniter import croniter
from pytz import all_timezones
class ValidationError(Exception):
pass
def validate(obj, schema, obj_name="value"):
if schema.get("type") == "string":
if not isinstance(obj, str):
raise ValidationError("%s is not a string" % obj_name)
if "minLength" in schema and len(obj) < schema["minLength"]:
raise ValidationError("%s is too short" % obj_name)
if "maxLength" in schema and len(obj) > schema["maxLength"]:
raise ValidationError("%s is too long" % obj_name)
if schema.get("format") == "cron":
try:
croniter(obj)
except:
raise ValidationError(
"%s is not a valid cron expression" % obj_name)
if schema.get("format") == "timezone" and obj not in all_timezones:
raise ValidationError("%s is not a valid timezone" % obj_name)
elif schema.get("type") == "number":
if not isinstance(obj, int):
raise ValidationError("%s is not a number" % obj_name)
if "minimum" in schema and obj < schema["minimum"]:
raise ValidationError("%s is too small" % obj_name)
if "maximum" in schema and obj > schema["maximum"]:
raise ValidationError("%s is too large" % obj_name)
elif schema.get("type") == "array":
if not isinstance(obj, list):
raise ValidationError("%s is not an array" % obj_name)
for v in obj:
validate(v, schema["items"], "an item in '%s'" % obj_name)
elif schema.get("type") == "object":
if not isinstance(obj, dict):
raise ValidationError("%s is not an object" % obj_name)
properties = schema.get("properties", {})
for key, spec in properties.items():
if key in obj:
validate(obj[key], spec, obj_name=key)
for key in schema.get("required", []):
if key not in obj:
raise ValidationError("key %s absent in %s" % (key, obj_name))
if "enum" in schema:
if obj not in schema["enum"]:
raise ValidationError("%s has unexpected value" % obj_name)