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from __future__ import print_function
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import json
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import os
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try:
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from jsonschema import SchemaError
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from jsonschema import Draft3Validator as Validator
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except ImportError as e:
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verbose_msg = """
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IPython depends on the jsonschema package: https://pypi.python.org/pypi/jsonschema
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Please install it first.
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"""
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raise ImportError(str(e) + verbose_msg)
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try:
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import jsonpointer as jsonpointer
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except ImportError as e:
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verbose_msg = """
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IPython depends on the jsonpointer package: https://pypi.python.org/pypi/jsonpointer
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Please install it first.
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"""
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raise ImportError(str(e) + verbose_msg)
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from IPython.utils.py3compat import iteritems
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from .current import nbformat, nbformat_schema
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schema_path = os.path.join(
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os.path.dirname(__file__), "v%d" % nbformat, nbformat_schema)
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def isvalid(nbjson):
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"""Checks whether the given notebook JSON conforms to the current
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notebook format schema. Returns True if the JSON is valid, and
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False otherwise.
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To see the individual errors that were encountered, please use the
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`validate` function instead.
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"""
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errors = validate(nbjson)
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return errors == []
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def validate(nbjson):
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"""Checks whether the given notebook JSON conforms to the current
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notebook format schema, and returns the list of errors.
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"""
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# load the schema file
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with open(schema_path, 'r') as fh:
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schema_json = json.load(fh)
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# resolve internal references
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schema = resolve_ref(schema_json)
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schema = jsonpointer.resolve_pointer(schema, '/notebook')
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# count how many errors there are
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v = Validator(schema)
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errors = list(v.iter_errors(nbjson))
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return errors
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def resolve_ref(json, schema=None):
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"""Resolve internal references within the given JSON. This essentially
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means that dictionaries of this form:
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{"$ref": "/somepointer"}
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will be replaced with the resolved reference to `/somepointer`.
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This only supports local reference to the same JSON file.
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"""
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if not schema:
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schema = json
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# if it's a list, resolve references for each item in the list
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if type(json) is list:
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resolved = []
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for item in json:
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resolved.append(resolve_ref(item, schema=schema))
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# if it's a dictionary, resolve references for each item in the
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# dictionary
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elif type(json) is dict:
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resolved = {}
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for key, ref in iteritems(json):
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# if the key is equal to $ref, then replace the entire
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# dictionary with the resolved value
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if key == '$ref':
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if len(json) != 1:
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raise SchemaError(
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"objects containing a $ref should only have one item")
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pointer = jsonpointer.resolve_pointer(schema, ref)
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resolved = resolve_ref(pointer, schema=schema)
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else:
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resolved[key] = resolve_ref(ref, schema=schema)
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# otherwise it's a normal object, so just return it
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else:
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resolved = json
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return resolved
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