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// Copyright 2018 The Linux Foundation
//
// 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 schema
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
"github.com/xeipuuv/gojsonreference"
"github.com/xeipuuv/gojsonschema"
)
// fsLoaderFactory implements gojsonschema.JSONLoaderFactory by reading files under the specified namespaces from the root of fs.
type fsLoaderFactory struct {
namespaces []string
fs http.FileSystem
}
// newFSLoaderFactory returns a fsLoaderFactory reading files under the specified namespaces from the root of fs.
func newFSLoaderFactory(namespaces []string, fs http.FileSystem) *fsLoaderFactory {
return &fsLoaderFactory{
namespaces: namespaces,
fs: fs,
}
}
func (factory *fsLoaderFactory) New(source string) gojsonschema.JSONLoader {
return &fsLoader{
factory: factory,
source: source,
}
}
// refContents returns the contents of ref, if available in fsLoaderFactory.
func (factory *fsLoaderFactory) refContents(ref gojsonreference.JsonReference) ([]byte, error) {
refStr := ref.String()
path := ""
for _, ns := range factory.namespaces {
if strings.HasPrefix(refStr, ns) {
path = "/" + strings.TrimPrefix(refStr, ns)
break
}
}
if path == "" {
return nil, fmt.Errorf("schema reference %#v unexpectedly not available in fsLoaderFactory with namespaces %#v", path, factory.namespaces)
}
f, err := factory.fs.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
return io.ReadAll(f)
}
// fsLoader implements gojsonschema.JSONLoader by reading the document named by source from a fsLoaderFactory.
type fsLoader struct {
factory *fsLoaderFactory
source string
}
// JsonSource implements gojsonschema.JSONLoader.JsonSource. The "Json" capitalization needs to be maintained to conform to the interface.
func (l *fsLoader) JsonSource() interface{} { // revive:disable-line:var-naming
return l.source
}
func (l *fsLoader) LoadJSON() (interface{}, error) {
// Based on gojsonschema.jsonReferenceLoader.LoadJSON.
reference, err := gojsonreference.NewJsonReference(l.source)
if err != nil {
return nil, err
}
refToURL := reference
refToURL.GetUrl().Fragment = ""
body, err := l.factory.refContents(refToURL)
if err != nil {
return nil, err
}
return decodeJSONUsingNumber(bytes.NewReader(body))
}
// decodeJSONUsingNumber returns JSON parsed from an io.Reader
func decodeJSONUsingNumber(r io.Reader) (interface{}, error) {
// Copied from gojsonschema.
var document interface{}
decoder := json.NewDecoder(r)
decoder.UseNumber()
err := decoder.Decode(&document)
if err != nil {
return nil, err
}
return document, nil
}
// JsonReference implements gojsonschema.JSONLoader.JsonReference. The "Json" capitalization needs to be maintained to conform to the interface.
func (l *fsLoader) JsonReference() (gojsonreference.JsonReference, error) { // revive:disable-line:var-naming
return gojsonreference.NewJsonReference(l.JsonSource().(string))
}
func (l *fsLoader) LoaderFactory() gojsonschema.JSONLoaderFactory {
return l.factory
}
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