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// Copyright 2018 johandorland ( https://github.com/johandorland )
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gojsonschema
import (
"bytes"
"errors"
"github.com/xeipuuv/gojsonreference"
)
// SchemaLoader is used to load schemas
type SchemaLoader struct {
pool *schemaPool
AutoDetect bool
Validate bool
Draft Draft
}
// NewSchemaLoader creates a new NewSchemaLoader
func NewSchemaLoader() *SchemaLoader {
ps := &SchemaLoader{
pool: &schemaPool{
schemaPoolDocuments: make(map[string]*schemaPoolDocument),
},
AutoDetect: true,
Validate: false,
Draft: Hybrid,
}
ps.pool.autoDetect = &ps.AutoDetect
return ps
}
func (sl *SchemaLoader) validateMetaschema(documentNode interface{}) error {
var (
schema string
err error
)
if sl.AutoDetect {
schema, _, err = parseSchemaURL(documentNode)
if err != nil {
return err
}
}
// If no explicit "$schema" is used, use the default metaschema associated with the draft used
if schema == "" {
if sl.Draft == Hybrid {
return nil
}
schema = drafts.GetSchemaURL(sl.Draft)
}
//Disable validation when loading the metaschema to prevent an infinite recursive loop
sl.Validate = false
metaSchema, err := sl.Compile(NewReferenceLoader(schema))
if err != nil {
return err
}
sl.Validate = true
result := metaSchema.validateDocument(documentNode)
if !result.Valid() {
var res bytes.Buffer
for _, err := range result.Errors() {
res.WriteString(err.String())
res.WriteString("\n")
}
return errors.New(res.String())
}
return nil
}
// AddSchemas adds an arbritrary amount of schemas to the schema cache. As this function does not require
// an explicit URL, every schema should contain an $id, so that it can be referenced by the main schema
func (sl *SchemaLoader) AddSchemas(loaders ...JSONLoader) error {
emptyRef, _ := gojsonreference.NewJsonReference("")
for _, loader := range loaders {
doc, err := loader.LoadJSON()
if err != nil {
return err
}
if sl.Validate {
if err := sl.validateMetaschema(doc); err != nil {
return err
}
}
// Directly use the Recursive function, so that it get only added to the schema pool by $id
// and not by the ref of the document as it's empty
if err = sl.pool.parseReferences(doc, emptyRef, false); err != nil {
return err
}
}
return nil
}
//AddSchema adds a schema under the provided URL to the schema cache
func (sl *SchemaLoader) AddSchema(url string, loader JSONLoader) error {
ref, err := gojsonreference.NewJsonReference(url)
if err != nil {
return err
}
doc, err := loader.LoadJSON()
if err != nil {
return err
}
if sl.Validate {
if err := sl.validateMetaschema(doc); err != nil {
return err
}
}
return sl.pool.parseReferences(doc, ref, true)
}
// Compile loads and compiles a schema
func (sl *SchemaLoader) Compile(rootSchema JSONLoader) (*Schema, error) {
ref, err := rootSchema.JsonReference()
if err != nil {
return nil, err
}
d := Schema{}
d.pool = sl.pool
d.pool.jsonLoaderFactory = rootSchema.LoaderFactory()
d.documentReference = ref
d.referencePool = newSchemaReferencePool()
var doc interface{}
if ref.String() != "" {
// Get document from schema pool
spd, err := d.pool.GetDocument(d.documentReference)
if err != nil {
return nil, err
}
doc = spd.Document
} else {
// Load JSON directly
doc, err = rootSchema.LoadJSON()
if err != nil {
return nil, err
}
// References need only be parsed if loading JSON directly
// as pool.GetDocument already does this for us if loading by reference
err = sl.pool.parseReferences(doc, ref, true)
if err != nil {
return nil, err
}
}
if sl.Validate {
if err := sl.validateMetaschema(doc); err != nil {
return nil, err
}
}
draft := sl.Draft
if sl.AutoDetect {
_, detectedDraft, err := parseSchemaURL(doc)
if err != nil {
return nil, err
}
if detectedDraft != nil {
draft = *detectedDraft
}
}
err = d.parse(doc, draft)
if err != nil {
return nil, err
}
return &d, nil
}
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