databricks-cli/libs/jsonschema/schema.go

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package jsonschema
import (
"encoding/json"
"fmt"
"os"
"regexp"
"slices"
)
// defines schema for a json object
type Schema struct {
// Type of the object
Type Type `json:"type,omitempty"`
// Description of the object. This is rendered as inline documentation in the
// IDE. This is manually injected here using schema.Docs
Description string `json:"description,omitempty"`
// Schemas for the fields of an struct. The keys are the first json tag.
// The values are the schema for the type of the field
Properties map[string]*Schema `json:"properties,omitempty"`
// The schema for all values of an array
Items *Schema `json:"items,omitempty"`
// The schema for any properties not mentioned in the Schema.Properties field.
// this validates maps[string]any in bundle configuration
// OR
// A boolean type with value false. Setting false here validates that all
// properties in the config have been defined in the json schema as properties
//
// Its type during runtime will either be *Schema or bool
AdditionalProperties any `json:"additionalProperties,omitempty"`
// Required properties for the object. Any fields missing the "omitempty"
// json tag will be included
Required []string `json:"required,omitempty"`
// URI to a json schema
Reference *string `json:"$ref,omitempty"`
// Default value for the property / object
Default any `json:"default,omitempty"`
// List of valid values for a JSON instance for this schema.
Enum []any `json:"enum,omitempty"`
// A pattern is a regular expression the object will be validated against.
// Can only be used with type "string". The regex syntax supported is available
// here: https://github.com/google/re2/wiki/Syntax
Pattern string `json:"pattern,omitempty"`
// Extension embeds our custom JSON schema extensions.
Extension
}
type Type string
const (
InvalidType Type = "invalid"
BooleanType Type = "boolean"
StringType Type = "string"
NumberType Type = "number"
ObjectType Type = "object"
ArrayType Type = "array"
IntegerType Type = "integer"
)
func (schema *Schema) validate() error {
// Validate property types are all valid JSON schema types.
for _, v := range schema.Properties {
switch v.Type {
case NumberType, BooleanType, StringType, IntegerType:
continue
case "int", "int32", "int64":
return fmt.Errorf("type %s is not a recognized json schema type. Please use \"integer\" instead", v.Type)
case "float", "float32", "float64":
return fmt.Errorf("type %s is not a recognized json schema type. Please use \"number\" instead", v.Type)
case "bool":
return fmt.Errorf("type %s is not a recognized json schema type. Please use \"boolean\" instead", v.Type)
default:
return fmt.Errorf("type %s is not a recognized json schema type", v.Type)
}
}
// Validate default property values are consistent with types.
for name, property := range schema.Properties {
if property.Default == nil {
continue
}
if err := validateType(property.Default, property.Type); err != nil {
return fmt.Errorf("type validation for default value of property %s failed: %w", name, err)
}
}
// Validate enum field values for properties are consistent with types.
for name, property := range schema.Properties {
if property.Enum == nil {
continue
}
for i, enum := range property.Enum {
err := validateType(enum, property.Type)
if err != nil {
return fmt.Errorf("type validation for enum at index %v failed for property %s: %w", i, name, err)
}
}
}
// Validate default value is contained in the list of enums if both are defined.
for name, property := range schema.Properties {
if property.Default == nil || property.Enum == nil {
continue
}
// We expect the default value to be consistent with the list of enum
// values.
if !slices.Contains(property.Enum, property.Default) {
return fmt.Errorf("list of enum values for property %s does not contain default value %v: %v", name, property.Default, property.Enum)
}
}
// Validate usage of "pattern" is consistent.
for name, property := range schema.Properties {
pattern := property.Pattern
if pattern == "" {
continue
}
// validate property type is string
if property.Type != StringType {
return fmt.Errorf("property %q has a non-empty regex pattern %q specified. Patterns are only supported for string properties", name, pattern)
}
// validate regex pattern syntax
r, err := regexp.Compile(pattern)
if err != nil {
return fmt.Errorf("invalid regex pattern %q provided for property %q: %w", pattern, name, err)
}
// validate default value against the pattern
if property.Default != nil && !r.MatchString(property.Default.(string)) {
return fmt.Errorf("default value %q for property %q does not match specified regex pattern: %q", property.Default, name, pattern)
}
// validate enum values against the pattern
for i, enum := range property.Enum {
if !r.MatchString(enum.(string)) {
return fmt.Errorf("enum value %q at index %v for property %q does not match specified regex pattern: %q", enum, i, name, pattern)
}
}
}
return nil
}
func Load(path string) (*Schema, error) {
b, err := os.ReadFile(path)
if err != nil {
return nil, err
}
schema := &Schema{}
err = json.Unmarshal(b, schema)
if err != nil {
return nil, err
}
// Convert the default values of top-level properties to integers.
// This is required because the default JSON unmarshaler parses numbers
// as floats when the Golang field it's being loaded to is untyped.
//
// NOTE: properties can be recursively defined in a schema, but the current
// use-cases only uses the first layer of properties so we skip converting
// any recursive properties.
for name, property := range schema.Properties {
if property.Type != IntegerType {
continue
}
if property.Default != nil {
property.Default, err = toInteger(property.Default)
if err != nil {
return nil, fmt.Errorf("failed to parse default value for property %s: %w", name, err)
}
}
for i, enum := range property.Enum {
property.Enum[i], err = toInteger(enum)
if err != nil {
return nil, fmt.Errorf("failed to parse enum value %v at index %v for property %s: %w", enum, i, name, err)
}
}
}
return schema, schema.validate()
}