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https://github.com/NVIDIA/nvidia-container-toolkit
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148 lines
3.8 KiB
Go
148 lines
3.8 KiB
Go
// Copyright 2015 xeipuuv ( https://github.com/xeipuuv )
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// author xeipuuv
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// author-github https://github.com/xeipuuv
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// author-mail xeipuuv@gmail.com
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//
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// repository-name gojsonreference
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// repository-desc An implementation of JSON Reference - Go language
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//
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// description Main and unique file.
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//
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// created 26-02-2013
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package gojsonreference
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import (
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"errors"
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"net/url"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/xeipuuv/gojsonpointer"
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)
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const (
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const_fragment_char = `#`
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)
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func NewJsonReference(jsonReferenceString string) (JsonReference, error) {
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var r JsonReference
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err := r.parse(jsonReferenceString)
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return r, err
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}
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type JsonReference struct {
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referenceUrl *url.URL
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referencePointer gojsonpointer.JsonPointer
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HasFullUrl bool
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HasUrlPathOnly bool
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HasFragmentOnly bool
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HasFileScheme bool
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HasFullFilePath bool
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}
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func (r *JsonReference) GetUrl() *url.URL {
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return r.referenceUrl
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}
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func (r *JsonReference) GetPointer() *gojsonpointer.JsonPointer {
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return &r.referencePointer
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}
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func (r *JsonReference) String() string {
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if r.referenceUrl != nil {
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return r.referenceUrl.String()
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}
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if r.HasFragmentOnly {
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return const_fragment_char + r.referencePointer.String()
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}
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return r.referencePointer.String()
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}
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func (r *JsonReference) IsCanonical() bool {
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return (r.HasFileScheme && r.HasFullFilePath) || (!r.HasFileScheme && r.HasFullUrl)
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}
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// "Constructor", parses the given string JSON reference
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func (r *JsonReference) parse(jsonReferenceString string) (err error) {
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r.referenceUrl, err = url.Parse(jsonReferenceString)
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if err != nil {
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return
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}
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refUrl := r.referenceUrl
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if refUrl.Scheme != "" && refUrl.Host != "" {
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r.HasFullUrl = true
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} else {
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if refUrl.Path != "" {
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r.HasUrlPathOnly = true
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} else if refUrl.RawQuery == "" && refUrl.Fragment != "" {
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r.HasFragmentOnly = true
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}
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}
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r.HasFileScheme = refUrl.Scheme == "file"
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if runtime.GOOS == "windows" {
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// on Windows, a file URL may have an extra leading slash, and if it
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// doesn't then its first component will be treated as the host by the
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// Go runtime
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if refUrl.Host == "" && strings.HasPrefix(refUrl.Path, "/") {
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r.HasFullFilePath = filepath.IsAbs(refUrl.Path[1:])
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} else {
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r.HasFullFilePath = filepath.IsAbs(refUrl.Host + refUrl.Path)
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}
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} else {
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r.HasFullFilePath = filepath.IsAbs(refUrl.Path)
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}
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// invalid json-pointer error means url has no json-pointer fragment. simply ignore error
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r.referencePointer, _ = gojsonpointer.NewJsonPointer(refUrl.Fragment)
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return
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}
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// Creates a new reference from a parent and a child
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// If the child cannot inherit from the parent, an error is returned
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func (r *JsonReference) Inherits(child JsonReference) (*JsonReference, error) {
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if child.GetUrl() == nil {
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return nil, errors.New("childUrl is nil!")
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}
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if r.GetUrl() == nil {
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return nil, errors.New("parentUrl is nil!")
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}
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// Get a copy of the parent url to make sure we do not modify the original.
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// URL reference resolving fails if the fragment of the child is empty, but the parent's is not.
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// The fragment of the child must be used, so the fragment of the parent is manually removed.
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parentUrl := *r.GetUrl()
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parentUrl.Fragment = ""
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ref, err := NewJsonReference(parentUrl.ResolveReference(child.GetUrl()).String())
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if err != nil {
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return nil, err
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}
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return &ref, err
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}
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