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// Copyright 2015 xeipuuv ( https://github.com/xeipuuv )
//
// 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.
// author xeipuuv
// author-github https://github.com/xeipuuv
// author-mail xeipuuv@gmail.com
//
// repository-name gojsonreference
// repository-desc An implementation of JSON Reference - Go language
//
// description Main and unique file.
//
// created 26-02-2013
package gojsonreference
import (
"errors"
"net/url"
"path/filepath"
"runtime"
"strings"
"github.com/xeipuuv/gojsonpointer"
)
const (
const_fragment_char = `#`
)
func NewJsonReference(jsonReferenceString string) (JsonReference, error) {
var r JsonReference
err := r.parse(jsonReferenceString)
return r, err
}
type JsonReference struct {
referenceUrl *url.URL
referencePointer gojsonpointer.JsonPointer
HasFullUrl bool
HasUrlPathOnly bool
HasFragmentOnly bool
HasFileScheme bool
HasFullFilePath bool
}
func (r *JsonReference) GetUrl() *url.URL {
return r.referenceUrl
}
func (r *JsonReference) GetPointer() *gojsonpointer.JsonPointer {
return &r.referencePointer
}
func (r *JsonReference) String() string {
if r.referenceUrl != nil {
return r.referenceUrl.String()
}
if r.HasFragmentOnly {
return const_fragment_char + r.referencePointer.String()
}
return r.referencePointer.String()
}
func (r *JsonReference) IsCanonical() bool {
return (r.HasFileScheme && r.HasFullFilePath) || (!r.HasFileScheme && r.HasFullUrl)
}
// "Constructor", parses the given string JSON reference
func (r *JsonReference) parse(jsonReferenceString string) (err error) {
r.referenceUrl, err = url.Parse(jsonReferenceString)
if err != nil {
return
}
refUrl := r.referenceUrl
if refUrl.Scheme != "" && refUrl.Host != "" {
r.HasFullUrl = true
} else {
if refUrl.Path != "" {
r.HasUrlPathOnly = true
} else if refUrl.RawQuery == "" && refUrl.Fragment != "" {
r.HasFragmentOnly = true
}
}
r.HasFileScheme = refUrl.Scheme == "file"
if runtime.GOOS == "windows" {
// on Windows, a file URL may have an extra leading slash, and if it
// doesn't then its first component will be treated as the host by the
// Go runtime
if refUrl.Host == "" && strings.HasPrefix(refUrl.Path, "/") {
r.HasFullFilePath = filepath.IsAbs(refUrl.Path[1:])
} else {
r.HasFullFilePath = filepath.IsAbs(refUrl.Host + refUrl.Path)
}
} else {
r.HasFullFilePath = filepath.IsAbs(refUrl.Path)
}
// invalid json-pointer error means url has no json-pointer fragment. simply ignore error
r.referencePointer, _ = gojsonpointer.NewJsonPointer(refUrl.Fragment)
return
}
// Creates a new reference from a parent and a child
// If the child cannot inherit from the parent, an error is returned
func (r *JsonReference) Inherits(child JsonReference) (*JsonReference, error) {
if child.GetUrl() == nil {
return nil, errors.New("childUrl is nil!")
}
if r.GetUrl() == nil {
return nil, errors.New("parentUrl is nil!")
}
// Get a copy of the parent url to make sure we do not modify the original.
// URL reference resolving fails if the fragment of the child is empty, but the parent's is not.
// The fragment of the child must be used, so the fragment of the parent is manually removed.
parentUrl := *r.GetUrl()
parentUrl.Fragment = ""
ref, err := NewJsonReference(parentUrl.ResolveReference(child.GetUrl()).String())
if err != nil {
return nil, err
}
return &ref, err
}
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