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draft.go
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package jsonschema
import (
"strconv"
"strings"
)
// A Draft represents json-schema draft
type Draft struct {
version int
meta *Schema
id string // property name used to represent schema id.
boolSchema bool // is boolean valid schema
subschemas map[string]position
}
func (d *Draft) loadMeta(base string, schemas map[string]string) {
c := NewCompiler()
c.AssertFormat = true
for u, schema := range schemas {
if err := c.AddResource(base+"/"+u, strings.NewReader(schema)); err != nil {
panic(err)
}
}
d.meta = c.MustCompile(base + "/schema")
}
func (d *Draft) getID(sch interface{}) string {
m, ok := sch.(map[string]interface{})
if !ok {
return ""
}
if _, ok := m["$ref"]; ok && d.version <= 7 {
// $ref prevents a sibling id from changing the base uri
return ""
}
v, ok := m[d.id]
if !ok {
return ""
}
id, ok := v.(string)
if !ok {
return ""
}
return id
}
func (d *Draft) resolveID(base string, sch interface{}) (string, error) {
id, _ := split(d.getID(sch)) // strip fragment
if id == "" {
return "", nil
}
url, err := resolveURL(base, id)
url, _ = split(url) // strip fragment
return url, err
}
func (d *Draft) anchors(sch interface{}) []string {
m, ok := sch.(map[string]interface{})
if !ok {
return nil
}
var anchors []string
// before draft2019, anchor is specified in id
_, f := split(d.getID(m))
if f != "#" {
anchors = append(anchors, f[1:])
}
if v, ok := m["$anchor"]; ok && d.version >= 2019 {
anchors = append(anchors, v.(string))
}
if v, ok := m["$dynamicAnchor"]; ok && d.version >= 2020 {
anchors = append(anchors, v.(string))
}
return anchors
}
// listSubschemas collects subschemas in r into rr.
func (d *Draft) listSubschemas(r *resource, base string, rr map[string]*resource) error {
add := func(loc string, sch interface{}) error {
url, err := d.resolveID(base, sch)
if err != nil {
return err
}
floc := r.floc + "/" + loc
sr := &resource{url: url, floc: floc, doc: sch}
rr[floc] = sr
base := base
if url != "" {
base = url
}
return d.listSubschemas(sr, base, rr)
}
sch, ok := r.doc.(map[string]interface{})
if !ok {
return nil
}
for kw, pos := range d.subschemas {
v, ok := sch[kw]
if !ok {
continue
}
if pos&self != 0 {
switch v := v.(type) {
case map[string]interface{}:
if err := add(kw, v); err != nil {
return err
}
case bool:
if d.boolSchema {
if err := add(kw, v); err != nil {
return err
}
}
}
}
if pos&item != 0 {
if v, ok := v.([]interface{}); ok {
for i, item := range v {
if err := add(kw+"/"+strconv.Itoa(i), item); err != nil {
return err
}
}
}
}
if pos&prop != 0 {
if v, ok := v.(map[string]interface{}); ok {
for pname, pval := range v {
if err := add(kw+"/"+escape(pname), pval); err != nil {
return err
}
}
}
}
}
return nil
}
type position uint
const (
self position = 1 << iota
prop
item
)
// supported drafts
var (
Draft4 = &Draft{version: 4, id: "id", boolSchema: false}
Draft6 = &Draft{version: 6, id: "$id", boolSchema: true}
Draft7 = &Draft{version: 7, id: "$id", boolSchema: true}
Draft2019 = &Draft{version: 2019, id: "$id", boolSchema: true}
Draft2020 = &Draft{version: 2020, id: "$id", boolSchema: true}
latest = Draft2020
)
func findDraft(url string) *Draft {
if strings.HasPrefix(url, "http://") {
url = "https://" + strings.TrimPrefix(url, "http://")
}
if strings.HasSuffix(url, "#") || strings.HasSuffix(url, "#/") {
url = url[:strings.IndexByte(url, '#')]
}
switch url {
case "https://json-schema.org/schema":
return latest
case "https://json-schema.org/draft/2020-12/schema":
return Draft2020
case "https://json-schema.org/draft/2019-09/schema":
return Draft2019
case "https://json-schema.org/draft-07/schema":
return Draft7
case "https://json-schema.org/draft-06/schema":
return Draft6
case "https://json-schema.org/draft-04/schema":
return Draft4
}
return nil
}
func init() {
subschemas := map[string]position{
// type agnostic
"definitions": prop,
"not": self,
"allOf": item,
"anyOf": item,
"oneOf": item,
// object
"properties": prop,
"additionalProperties": self,
"patternProperties": prop,
// array
"items": self | item,
"additionalItems": self,
"dependencies": prop,
}
Draft4.subschemas = clone(subschemas)
subschemas["propertyNames"] = self
subschemas["contains"] = self
Draft6.subschemas = clone(subschemas)
subschemas["if"] = self
subschemas["then"] = self
subschemas["else"] = self
Draft7.subschemas = clone(subschemas)
subschemas["$defs"] = prop
subschemas["dependentSchemas"] = prop
subschemas["unevaluatedProperties"] = self
subschemas["unevaluatedItems"] = self
Draft2019.subschemas = clone(subschemas)
subschemas["prefixItems"] = item
Draft2020.subschemas = clone(subschemas)
Draft4.loadMeta("http://json-schema.org/draft-04", map[string]string{
"schema": `{
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Core schema meta-schema",
"definitions": {
"schemaArray": {
"type": "array",
"minItems": 1,
"items": { "$ref": "#" }
},
"positiveInteger": {
"type": "integer",
"minimum": 0
},
"positiveIntegerDefault0": {
"allOf": [ { "$ref": "#/definitions/positiveInteger" }, { "default": 0 } ]
},
"simpleTypes": {
"enum": [ "array", "boolean", "integer", "null", "number", "object", "string" ]
},
"stringArray": {
"type": "array",
"items": { "type": "string" },
"minItems": 1,
"uniqueItems": true
}
},
"type": "object",
"properties": {
"id": {
"type": "string",
"format": "uriref"
},
"$schema": {
"type": "string",
"format": "uri"
},
"title": {
"type": "string"
},
"description": {
"type": "string"
},
"default": {},
"multipleOf": {
"type": "number",
"minimum": 0,
"exclusiveMinimum": true
},
"maximum": {
"type": "number"
},
"exclusiveMaximum": {
"type": "boolean",
"default": false
},
"minimum": {
"type": "number"
},
"exclusiveMinimum": {
"type": "boolean",
"default": false
},
"maxLength": { "$ref": "#/definitions/positiveInteger" },
"minLength": { "$ref": "#/definitions/positiveIntegerDefault0" },
"pattern": {
"type": "string",
"format": "regex"
},
"additionalItems": {
"anyOf": [
{ "type": "boolean" },
{ "$ref": "#" }
],
"default": {}
},
"items": {
"anyOf": [
{ "$ref": "#" },
{ "$ref": "#/definitions/schemaArray" }
],
"default": {}
},
"maxItems": { "$ref": "#/definitions/positiveInteger" },
"minItems": { "$ref": "#/definitions/positiveIntegerDefault0" },
"uniqueItems": {
"type": "boolean",
"default": false
},
"maxProperties": { "$ref": "#/definitions/positiveInteger" },
"minProperties": { "$ref": "#/definitions/positiveIntegerDefault0" },
"required": { "$ref": "#/definitions/stringArray" },
"additionalProperties": {
"anyOf": [
{ "type": "boolean" },
{ "$ref": "#" }
],
"default": {}
},
"definitions": {
"type": "object",
"additionalProperties": { "$ref": "#" },
"default": {}
},
"properties": {
"type": "object",
"additionalProperties": { "$ref": "#" },
"default": {}
},
"patternProperties": {
"type": "object",
"regexProperties": true,
"additionalProperties": { "$ref": "#" },
"default": {}
},
"regexProperties": { "type": "boolean" },
"dependencies": {
"type": "object",
"additionalProperties": {
"anyOf": [
{ "$ref": "#" },
{ "$ref": "#/definitions/stringArray" }
]
}
},
"enum": {
"type": "array",
"minItems": 1,
"uniqueItems": true
},
"type": {
"anyOf": [
{ "$ref": "#/definitions/simpleTypes" },
{
"type": "array",
"items": { "$ref": "#/definitions/simpleTypes" },
"minItems": 1,
"uniqueItems": true
}
]
},
"allOf": { "$ref": "#/definitions/schemaArray" },
"anyOf": { "$ref": "#/definitions/schemaArray" },
"oneOf": { "$ref": "#/definitions/schemaArray" },
"not": { "$ref": "#" },
"format": { "type": "string" },
"$ref": { "type": "string" }
},
"dependencies": {
"exclusiveMaximum": [ "maximum" ],
"exclusiveMinimum": [ "minimum" ]
},
"default": {}
}`,
})
Draft6.loadMeta("http://json-schema.org/draft-06", map[string]string{
"schema": `{
"$schema": "http://json-schema.org/draft-06/schema#",
"$id": "http://json-schema.org/draft-06/schema#",
"title": "Core schema meta-schema",
"definitions": {
"schemaArray": {
"type": "array",
"minItems": 1,
"items": { "$ref": "#" }
},
"nonNegativeInteger": {
"type": "integer",
"minimum": 0
},
"nonNegativeIntegerDefault0": {
"allOf": [
{ "$ref": "#/definitions/nonNegativeInteger" },
{ "default": 0 }
]
},
"simpleTypes": {
"enum": [
"array",
"boolean",
"integer",
"null",
"number",
"object",
"string"
]
},
"stringArray": {
"type": "array",
"items": { "type": "string" },
"uniqueItems": true,
"default": []
}
},
"type": ["object", "boolean"],
"properties": {
"$id": {
"type": "string",
"format": "uri-reference"
},
"$schema": {
"type": "string",
"format": "uri"
},
"$ref": {
"type": "string",
"format": "uri-reference"
},
"title": {
"type": "string"
},
"description": {
"type": "string"
},
"default": {},
"multipleOf": {
"type": "number",
"exclusiveMinimum": 0
},
"maximum": {
"type": "number"
},
"exclusiveMaximum": {
"type": "number"
},
"minimum": {
"type": "number"
},
"exclusiveMinimum": {
"type": "number"
},
"maxLength": { "$ref": "#/definitions/nonNegativeInteger" },
"minLength": { "$ref": "#/definitions/nonNegativeIntegerDefault0" },
"pattern": {
"type": "string",
"format": "regex"
},
"additionalItems": { "$ref": "#" },
"items": {
"anyOf": [
{ "$ref": "#" },
{ "$ref": "#/definitions/schemaArray" }
],
"default": {}
},
"maxItems": { "$ref": "#/definitions/nonNegativeInteger" },
"minItems": { "$ref": "#/definitions/nonNegativeIntegerDefault0" },
"uniqueItems": {
"type": "boolean",
"default": false
},
"contains": { "$ref": "#" },
"maxProperties": { "$ref": "#/definitions/nonNegativeInteger" },
"minProperties": { "$ref": "#/definitions/nonNegativeIntegerDefault0" },
"required": { "$ref": "#/definitions/stringArray" },
"additionalProperties": { "$ref": "#" },
"definitions": {
"type": "object",
"additionalProperties": { "$ref": "#" },
"default": {}
},
"properties": {
"type": "object",
"additionalProperties": { "$ref": "#" },
"default": {}
},
"patternProperties": {
"type": "object",
"regexProperties": true,
"additionalProperties": { "$ref": "#" },
"default": {}
},
"dependencies": {
"type": "object",
"additionalProperties": {
"anyOf": [
{ "$ref": "#" },
{ "$ref": "#/definitions/stringArray" }
]
}
},
"propertyNames": { "$ref": "#" },
"const": {},
"enum": {
"type": "array",
"minItems": 1,
"uniqueItems": true
},
"type": {
"anyOf": [
{ "$ref": "#/definitions/simpleTypes" },
{
"type": "array",
"items": { "$ref": "#/definitions/simpleTypes" },
"minItems": 1,
"uniqueItems": true
}
]
},
"format": { "type": "string" },
"allOf": { "$ref": "#/definitions/schemaArray" },
"anyOf": { "$ref": "#/definitions/schemaArray" },
"oneOf": { "$ref": "#/definitions/schemaArray" },
"not": { "$ref": "#" }
},
"default": {}
}`,
})
Draft7.loadMeta("http://json-schema.org/draft-07", map[string]string{
"schema": `{
"$schema": "http://json-schema.org/draft-07/schema#",
"$id": "http://json-schema.org/draft-07/schema#",
"title": "Core schema meta-schema",
"definitions": {
"schemaArray": {
"type": "array",
"minItems": 1,
"items": { "$ref": "#" }
},
"nonNegativeInteger": {
"type": "integer",
"minimum": 0
},
"nonNegativeIntegerDefault0": {
"allOf": [
{ "$ref": "#/definitions/nonNegativeInteger" },
{ "default": 0 }
]
},
"simpleTypes": {
"enum": [
"array",
"boolean",
"integer",
"null",
"number",
"object",
"string"
]
},
"stringArray": {
"type": "array",
"items": { "type": "string" },
"uniqueItems": true,
"default": []
}
},
"type": ["object", "boolean"],
"properties": {
"$id": {
"type": "string",
"format": "uri-reference"
},
"$schema": {
"type": "string",
"format": "uri"
},
"$ref": {
"type": "string",
"format": "uri-reference"
},
"$comment": {
"type": "string"
},
"title": {
"type": "string"
},
"description": {
"type": "string"
},
"default": true,
"readOnly": {
"type": "boolean",
"default": false
},
"writeOnly": {
"type": "boolean",
"default": false
},
"examples": {
"type": "array",
"items": true
},
"multipleOf": {
"type": "number",
"exclusiveMinimum": 0
},
"maximum": {
"type": "number"
},
"exclusiveMaximum": {
"type": "number"
},
"minimum": {
"type": "number"
},
"exclusiveMinimum": {
"type": "number"
},
"maxLength": { "$ref": "#/definitions/nonNegativeInteger" },
"minLength": { "$ref": "#/definitions/nonNegativeIntegerDefault0" },
"pattern": {
"type": "string",
"format": "regex"
},
"additionalItems": { "$ref": "#" },
"items": {
"anyOf": [
{ "$ref": "#" },
{ "$ref": "#/definitions/schemaArray" }
],
"default": true
},
"maxItems": { "$ref": "#/definitions/nonNegativeInteger" },
"minItems": { "$ref": "#/definitions/nonNegativeIntegerDefault0" },
"uniqueItems": {
"type": "boolean",
"default": false
},
"contains": { "$ref": "#" },
"maxProperties": { "$ref": "#/definitions/nonNegativeInteger" },
"minProperties": { "$ref": "#/definitions/nonNegativeIntegerDefault0" },
"required": { "$ref": "#/definitions/stringArray" },
"additionalProperties": { "$ref": "#" },
"definitions": {
"type": "object",
"additionalProperties": { "$ref": "#" },
"default": {}
},
"properties": {
"type": "object",
"additionalProperties": { "$ref": "#" },
"default": {}
},
"patternProperties": {
"type": "object",
"additionalProperties": { "$ref": "#" },
"propertyNames": { "format": "regex" },
"default": {}
},
"dependencies": {
"type": "object",
"additionalProperties": {
"anyOf": [
{ "$ref": "#" },
{ "$ref": "#/definitions/stringArray" }
]
}
},
"propertyNames": { "$ref": "#" },
"const": true,
"enum": {
"type": "array",
"items": true,
"minItems": 1,
"uniqueItems": true
},
"type": {
"anyOf": [
{ "$ref": "#/definitions/simpleTypes" },
{
"type": "array",
"items": { "$ref": "#/definitions/simpleTypes" },
"minItems": 1,
"uniqueItems": true
}
]
},
"format": { "type": "string" },
"contentMediaType": { "type": "string" },
"contentEncoding": { "type": "string" },
"if": { "$ref": "#" },
"then": { "$ref": "#" },
"else": { "$ref": "#" },
"allOf": { "$ref": "#/definitions/schemaArray" },
"anyOf": { "$ref": "#/definitions/schemaArray" },
"oneOf": { "$ref": "#/definitions/schemaArray" },
"not": { "$ref": "#" }
},
"default": true
}`,
})
Draft2019.loadMeta("https://json-schema.org/draft/2019-09", map[string]string{
"schema": `{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"$id": "https://json-schema.org/draft/2019-09/schema",
"$vocabulary": {
"https://json-schema.org/draft/2019-09/vocab/core": true,
"https://json-schema.org/draft/2019-09/vocab/applicator": true,
"https://json-schema.org/draft/2019-09/vocab/validation": true,
"https://json-schema.org/draft/2019-09/vocab/meta-data": true,
"https://json-schema.org/draft/2019-09/vocab/format": false,
"https://json-schema.org/draft/2019-09/vocab/content": true
},
"$recursiveAnchor": true,
"title": "Core and Validation specifications meta-schema",
"allOf": [
{"$ref": "meta/core"},
{"$ref": "meta/applicator"},
{"$ref": "meta/validation"},
{"$ref": "meta/meta-data"},
{"$ref": "meta/format"},
{"$ref": "meta/content"}
],
"type": ["object", "boolean"],
"properties": {
"definitions": {
"$comment": "While no longer an official keyword as it is replaced by $defs, this keyword is retained in the meta-schema to prevent incompatible extensions as it remains in common use.",
"type": "object",
"additionalProperties": { "$recursiveRef": "#" },
"default": {}
},
"dependencies": {
"$comment": "\"dependencies\" is no longer a keyword, but schema authors should avoid redefining it to facilitate a smooth transition to \"dependentSchemas\" and \"dependentRequired\"",
"type": "object",
"additionalProperties": {
"anyOf": [
{ "$recursiveRef": "#" },
{ "$ref": "meta/validation#/$defs/stringArray" }
]
}
}
}
}`,
"meta/core": `{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"$id": "https://json-schema.org/draft/2019-09/meta/core",
"$vocabulary": {
"https://json-schema.org/draft/2019-09/vocab/core": true
},
"$recursiveAnchor": true,
"title": "Core vocabulary meta-schema",
"type": ["object", "boolean"],
"properties": {
"$id": {
"type": "string",
"format": "uri-reference",
"$comment": "Non-empty fragments not allowed.",
"pattern": "^[^#]*#?$"
},
"$schema": {
"type": "string",
"format": "uri"
},
"$anchor": {
"type": "string",
"pattern": "^[A-Za-z][-A-Za-z0-9.:_]*$"
},
"$ref": {
"type": "string",
"format": "uri-reference"
},
"$recursiveRef": {
"type": "string",
"format": "uri-reference"
},
"$recursiveAnchor": {
"type": "boolean",
"default": false
},
"$vocabulary": {
"type": "object",
"propertyNames": {
"type": "string",
"format": "uri"
},
"additionalProperties": {
"type": "boolean"
}
},
"$comment": {
"type": "string"
},
"$defs": {
"type": "object",
"additionalProperties": { "$recursiveRef": "#" },
"default": {}
}
}
}`,
"meta/applicator": `{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"$id": "https://json-schema.org/draft/2019-09/meta/applicator",
"$vocabulary": {
"https://json-schema.org/draft/2019-09/vocab/applicator": true
},
"$recursiveAnchor": true,
"title": "Applicator vocabulary meta-schema",
"type": ["object", "boolean"],
"properties": {
"additionalItems": { "$recursiveRef": "#" },
"unevaluatedItems": { "$recursiveRef": "#" },
"items": {
"anyOf": [
{ "$recursiveRef": "#" },
{ "$ref": "#/$defs/schemaArray" }
]
},
"contains": { "$recursiveRef": "#" },
"additionalProperties": { "$recursiveRef": "#" },
"unevaluatedProperties": { "$recursiveRef": "#" },
"properties": {
"type": "object",
"additionalProperties": { "$recursiveRef": "#" },
"default": {}
},
"patternProperties": {
"type": "object",
"additionalProperties": { "$recursiveRef": "#" },
"propertyNames": { "format": "regex" },
"default": {}
},
"dependentSchemas": {
"type": "object",
"additionalProperties": {
"$recursiveRef": "#"
}
},
"propertyNames": { "$recursiveRef": "#" },
"if": { "$recursiveRef": "#" },
"then": { "$recursiveRef": "#" },
"else": { "$recursiveRef": "#" },
"allOf": { "$ref": "#/$defs/schemaArray" },
"anyOf": { "$ref": "#/$defs/schemaArray" },
"oneOf": { "$ref": "#/$defs/schemaArray" },
"not": { "$recursiveRef": "#" }
},
"$defs": {
"schemaArray": {
"type": "array",
"minItems": 1,
"items": { "$recursiveRef": "#" }
}
}
}`,
"meta/validation": `{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"$id": "https://json-schema.org/draft/2019-09/meta/validation",
"$vocabulary": {
"https://json-schema.org/draft/2019-09/vocab/validation": true
},
"$recursiveAnchor": true,
"title": "Validation vocabulary meta-schema",
"type": ["object", "boolean"],
"properties": {
"multipleOf": {
"type": "number",
"exclusiveMinimum": 0
},
"maximum": {
"type": "number"
},
"exclusiveMaximum": {
"type": "number"
},
"minimum": {
"type": "number"
},
"exclusiveMinimum": {
"type": "number"
},
"maxLength": { "$ref": "#/$defs/nonNegativeInteger" },
"minLength": { "$ref": "#/$defs/nonNegativeIntegerDefault0" },
"pattern": {
"type": "string",
"format": "regex"
},
"maxItems": { "$ref": "#/$defs/nonNegativeInteger" },
"minItems": { "$ref": "#/$defs/nonNegativeIntegerDefault0" },
"uniqueItems": {
"type": "boolean",
"default": false
},
"maxContains": { "$ref": "#/$defs/nonNegativeInteger" },
"minContains": {
"$ref": "#/$defs/nonNegativeInteger",
"default": 1
},
"maxProperties": { "$ref": "#/$defs/nonNegativeInteger" },
"minProperties": { "$ref": "#/$defs/nonNegativeIntegerDefault0" },
"required": { "$ref": "#/$defs/stringArray" },
"dependentRequired": {
"type": "object",
"additionalProperties": {
"$ref": "#/$defs/stringArray"
}
},
"const": true,
"enum": {
"type": "array",
"items": true
},
"type": {
"anyOf": [
{ "$ref": "#/$defs/simpleTypes" },
{
"type": "array",
"items": { "$ref": "#/$defs/simpleTypes" },
"minItems": 1,
"uniqueItems": true
}
]
}
},
"$defs": {
"nonNegativeInteger": {
"type": "integer",
"minimum": 0
},
"nonNegativeIntegerDefault0": {
"$ref": "#/$defs/nonNegativeInteger",
"default": 0
},
"simpleTypes": {
"enum": [
"array",
"boolean",
"integer",
"null",
"number",
"object",
"string"
]
},
"stringArray": {
"type": "array",
"items": { "type": "string" },
"uniqueItems": true,
"default": []
}
}
}`,
"meta/meta-data": `{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"$id": "https://json-schema.org/draft/2019-09/meta/meta-data",
"$vocabulary": {
"https://json-schema.org/draft/2019-09/vocab/meta-data": true
},
"$recursiveAnchor": true,
"title": "Meta-data vocabulary meta-schema",
"type": ["object", "boolean"],
"properties": {
"title": {
"type": "string"
},
"description": {
"type": "string"
},
"default": true,
"deprecated": {
"type": "boolean",
"default": false
},
"readOnly": {
"type": "boolean",
"default": false
},
"writeOnly": {
"type": "boolean",
"default": false
},
"examples": {
"type": "array",
"items": true
}
}
}`,
"meta/format": `{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"$id": "https://json-schema.org/draft/2019-09/meta/format",
"$vocabulary": {