prometheus/vendor/github.com/go-openapi/spec/expander.go
2016-10-17 10:32:10 +02:00

627 lines
14 KiB
Go

// Copyright 2015 go-swagger maintainers
//
// 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 spec
import (
"encoding/json"
"fmt"
"net/url"
"reflect"
"strings"
"sync"
"github.com/go-openapi/jsonpointer"
"github.com/go-openapi/swag"
)
// ResolutionCache a cache for resolving urls
type ResolutionCache interface {
Get(string) (interface{}, bool)
Set(string, interface{})
}
type simpleCache struct {
lock sync.Mutex
store map[string]interface{}
}
var resCache = initResolutionCache()
func initResolutionCache() ResolutionCache {
return &simpleCache{store: map[string]interface{}{
"http://swagger.io/v2/schema.json": MustLoadSwagger20Schema(),
"http://json-schema.org/draft-04/schema": MustLoadJSONSchemaDraft04(),
}}
}
func (s *simpleCache) Get(uri string) (interface{}, bool) {
s.lock.Lock()
v, ok := s.store[uri]
s.lock.Unlock()
return v, ok
}
func (s *simpleCache) Set(uri string, data interface{}) {
s.lock.Lock()
s.store[uri] = data
s.lock.Unlock()
}
// ResolveRef resolves a reference against a context root
func ResolveRef(root interface{}, ref *Ref) (*Schema, error) {
resolver, err := defaultSchemaLoader(root, nil, nil)
if err != nil {
return nil, err
}
result := new(Schema)
if err := resolver.Resolve(ref, result); err != nil {
return nil, err
}
return result, nil
}
// ResolveParameter resolves a paramter reference against a context root
func ResolveParameter(root interface{}, ref Ref) (*Parameter, error) {
resolver, err := defaultSchemaLoader(root, nil, nil)
if err != nil {
return nil, err
}
result := new(Parameter)
if err := resolver.Resolve(&ref, result); err != nil {
return nil, err
}
return result, nil
}
// ResolveResponse resolves response a reference against a context root
func ResolveResponse(root interface{}, ref Ref) (*Response, error) {
resolver, err := defaultSchemaLoader(root, nil, nil)
if err != nil {
return nil, err
}
result := new(Response)
if err := resolver.Resolve(&ref, result); err != nil {
return nil, err
}
return result, nil
}
type schemaLoader struct {
loadingRef *Ref
startingRef *Ref
currentRef *Ref
root interface{}
cache ResolutionCache
loadDoc func(string) (json.RawMessage, error)
}
var idPtr, _ = jsonpointer.New("/id")
var schemaPtr, _ = jsonpointer.New("/$schema")
var refPtr, _ = jsonpointer.New("/$ref")
func defaultSchemaLoader(root interface{}, ref *Ref, cache ResolutionCache) (*schemaLoader, error) {
if cache == nil {
cache = resCache
}
var ptr *jsonpointer.Pointer
if ref != nil {
ptr = ref.GetPointer()
}
currentRef := nextRef(root, ref, ptr)
return &schemaLoader{
root: root,
loadingRef: ref,
startingRef: ref,
cache: cache,
loadDoc: func(path string) (json.RawMessage, error) {
data, err := swag.LoadFromFileOrHTTP(path)
if err != nil {
return nil, err
}
return json.RawMessage(data), nil
},
currentRef: currentRef,
}, nil
}
func idFromNode(node interface{}) (*Ref, error) {
if idValue, _, err := idPtr.Get(node); err == nil {
if refStr, ok := idValue.(string); ok && refStr != "" {
idRef, err := NewRef(refStr)
if err != nil {
return nil, err
}
return &idRef, nil
}
}
return nil, nil
}
func nextRef(startingNode interface{}, startingRef *Ref, ptr *jsonpointer.Pointer) *Ref {
if startingRef == nil {
return nil
}
if ptr == nil {
return startingRef
}
ret := startingRef
var idRef *Ref
node := startingNode
for _, tok := range ptr.DecodedTokens() {
node, _, _ = jsonpointer.GetForToken(node, tok)
if node == nil {
break
}
idRef, _ = idFromNode(node)
if idRef != nil {
nw, err := ret.Inherits(*idRef)
if err != nil {
break
}
ret = nw
}
refRef, _, _ := refPtr.Get(node)
if refRef != nil {
rf, _ := NewRef(refRef.(string))
nw, err := ret.Inherits(rf)
if err != nil {
break
}
ret = nw
}
}
return ret
}
func (r *schemaLoader) resolveRef(currentRef, ref *Ref, node, target interface{}) error {
tgt := reflect.ValueOf(target)
if tgt.Kind() != reflect.Ptr {
return fmt.Errorf("resolve ref: target needs to be a pointer")
}
oldRef := currentRef
if currentRef != nil {
var err error
currentRef, err = currentRef.Inherits(*nextRef(node, ref, currentRef.GetPointer()))
if err != nil {
return err
}
}
if currentRef == nil {
currentRef = ref
}
refURL := currentRef.GetURL()
if refURL == nil {
return nil
}
if currentRef.IsRoot() {
nv := reflect.ValueOf(node)
reflect.Indirect(tgt).Set(reflect.Indirect(nv))
return nil
}
if strings.HasPrefix(refURL.String(), "#") {
res, _, err := ref.GetPointer().Get(node)
if err != nil {
res, _, err = ref.GetPointer().Get(r.root)
if err != nil {
return err
}
}
rv := reflect.Indirect(reflect.ValueOf(res))
tgtType := reflect.Indirect(tgt).Type()
if rv.Type().AssignableTo(tgtType) {
reflect.Indirect(tgt).Set(reflect.Indirect(reflect.ValueOf(res)))
} else {
if err := swag.DynamicJSONToStruct(rv.Interface(), target); err != nil {
return err
}
}
return nil
}
if refURL.Scheme != "" && refURL.Host != "" {
// most definitely take the red pill
data, _, _, err := r.load(refURL)
if err != nil {
return err
}
if ((oldRef == nil && currentRef != nil) ||
(oldRef != nil && currentRef == nil) ||
oldRef.String() != currentRef.String()) &&
((oldRef == nil && ref != nil) ||
(oldRef != nil && ref == nil) ||
(oldRef.String() != ref.String())) {
return r.resolveRef(currentRef, ref, data, target)
}
var res interface{}
if currentRef.String() != "" {
res, _, err = currentRef.GetPointer().Get(data)
if err != nil {
return err
}
} else {
res = data
}
if err := swag.DynamicJSONToStruct(res, target); err != nil {
return err
}
}
return nil
}
func (r *schemaLoader) load(refURL *url.URL) (interface{}, url.URL, bool, error) {
toFetch := *refURL
toFetch.Fragment = ""
data, fromCache := r.cache.Get(toFetch.String())
if !fromCache {
b, err := r.loadDoc(toFetch.String())
if err != nil {
return nil, url.URL{}, false, err
}
if err := json.Unmarshal(b, &data); err != nil {
return nil, url.URL{}, false, err
}
r.cache.Set(toFetch.String(), data)
}
return data, toFetch, fromCache, nil
}
func (r *schemaLoader) Resolve(ref *Ref, target interface{}) error {
if err := r.resolveRef(r.currentRef, ref, r.root, target); err != nil {
return err
}
return nil
}
type specExpander struct {
spec *Swagger
resolver *schemaLoader
}
// ExpandSpec expands the references in a swagger spec
func ExpandSpec(spec *Swagger) error {
resolver, err := defaultSchemaLoader(spec, nil, nil)
if err != nil {
return err
}
for key, defintition := range spec.Definitions {
var def *Schema
var err error
if def, err = expandSchema(defintition, []string{"#/definitions/" + key}, resolver); err != nil {
return err
}
spec.Definitions[key] = *def
}
for key, parameter := range spec.Parameters {
if err := expandParameter(&parameter, resolver); err != nil {
return err
}
spec.Parameters[key] = parameter
}
for key, response := range spec.Responses {
if err := expandResponse(&response, resolver); err != nil {
return err
}
spec.Responses[key] = response
}
if spec.Paths != nil {
for key, path := range spec.Paths.Paths {
if err := expandPathItem(&path, resolver); err != nil {
return err
}
spec.Paths.Paths[key] = path
}
}
return nil
}
// ExpandSchema expands the refs in the schema object
func ExpandSchema(schema *Schema, root interface{}, cache ResolutionCache) error {
if schema == nil {
return nil
}
if root == nil {
root = schema
}
nrr, _ := NewRef(schema.ID)
var rrr *Ref
if nrr.String() != "" {
switch root.(type) {
case *Schema:
rid, _ := NewRef(root.(*Schema).ID)
rrr, _ = rid.Inherits(nrr)
case *Swagger:
rid, _ := NewRef(root.(*Swagger).ID)
rrr, _ = rid.Inherits(nrr)
}
}
resolver, err := defaultSchemaLoader(root, rrr, cache)
if err != nil {
return err
}
refs := []string{""}
if rrr != nil {
refs[0] = rrr.String()
}
var s *Schema
if s, err = expandSchema(*schema, refs, resolver); err != nil {
return nil
}
*schema = *s
return nil
}
func expandItems(target Schema, parentRefs []string, resolver *schemaLoader) (*Schema, error) {
if target.Items != nil {
if target.Items.Schema != nil {
t, err := expandSchema(*target.Items.Schema, parentRefs, resolver)
if err != nil {
return nil, err
}
*target.Items.Schema = *t
}
for i := range target.Items.Schemas {
t, err := expandSchema(target.Items.Schemas[i], parentRefs, resolver)
if err != nil {
return nil, err
}
target.Items.Schemas[i] = *t
}
}
return &target, nil
}
func expandSchema(target Schema, parentRefs []string, resolver *schemaLoader) (schema *Schema, err error) {
defer func() {
schema = &target
}()
if target.Ref.String() == "" && target.Ref.IsRoot() {
target = *resolver.root.(*Schema)
return
}
// t is the new expanded schema
var t *Schema
for target.Ref.String() != "" {
// var newTarget Schema
pRefs := strings.Join(parentRefs, ",")
pRefs += ","
if strings.Contains(pRefs, target.Ref.String()+",") {
err = nil
return
}
if err = resolver.Resolve(&target.Ref, &t); err != nil {
return
}
parentRefs = append(parentRefs, target.Ref.String())
target = *t
}
if t, err = expandItems(target, parentRefs, resolver); err != nil {
return
}
target = *t
for i := range target.AllOf {
if t, err = expandSchema(target.AllOf[i], parentRefs, resolver); err != nil {
return
}
target.AllOf[i] = *t
}
for i := range target.AnyOf {
if t, err = expandSchema(target.AnyOf[i], parentRefs, resolver); err != nil {
return
}
target.AnyOf[i] = *t
}
for i := range target.OneOf {
if t, err = expandSchema(target.OneOf[i], parentRefs, resolver); err != nil {
return
}
target.OneOf[i] = *t
}
if target.Not != nil {
if t, err = expandSchema(*target.Not, parentRefs, resolver); err != nil {
return
}
*target.Not = *t
}
for k, _ := range target.Properties {
if t, err = expandSchema(target.Properties[k], parentRefs, resolver); err != nil {
return
}
target.Properties[k] = *t
}
if target.AdditionalProperties != nil && target.AdditionalProperties.Schema != nil {
if t, err = expandSchema(*target.AdditionalProperties.Schema, parentRefs, resolver); err != nil {
return
}
*target.AdditionalProperties.Schema = *t
}
for k, _ := range target.PatternProperties {
if t, err = expandSchema(target.PatternProperties[k], parentRefs, resolver); err != nil {
return
}
target.PatternProperties[k] = *t
}
for k, _ := range target.Dependencies {
if target.Dependencies[k].Schema != nil {
if t, err = expandSchema(*target.Dependencies[k].Schema, parentRefs, resolver); err != nil {
return
}
*target.Dependencies[k].Schema = *t
}
}
if target.AdditionalItems != nil && target.AdditionalItems.Schema != nil {
if t, err = expandSchema(*target.AdditionalItems.Schema, parentRefs, resolver); err != nil {
return
}
*target.AdditionalItems.Schema = *t
}
for k, _ := range target.Definitions {
if t, err = expandSchema(target.Definitions[k], parentRefs, resolver); err != nil {
return
}
target.Definitions[k] = *t
}
return
}
func expandPathItem(pathItem *PathItem, resolver *schemaLoader) error {
if pathItem == nil {
return nil
}
if pathItem.Ref.String() != "" {
if err := resolver.Resolve(&pathItem.Ref, &pathItem); err != nil {
return err
}
}
for idx := range pathItem.Parameters {
if err := expandParameter(&(pathItem.Parameters[idx]), resolver); err != nil {
return err
}
}
if err := expandOperation(pathItem.Get, resolver); err != nil {
return err
}
if err := expandOperation(pathItem.Head, resolver); err != nil {
return err
}
if err := expandOperation(pathItem.Options, resolver); err != nil {
return err
}
if err := expandOperation(pathItem.Put, resolver); err != nil {
return err
}
if err := expandOperation(pathItem.Post, resolver); err != nil {
return err
}
if err := expandOperation(pathItem.Patch, resolver); err != nil {
return err
}
if err := expandOperation(pathItem.Delete, resolver); err != nil {
return err
}
return nil
}
func expandOperation(op *Operation, resolver *schemaLoader) error {
if op == nil {
return nil
}
for i, param := range op.Parameters {
if err := expandParameter(&param, resolver); err != nil {
return err
}
op.Parameters[i] = param
}
if op.Responses != nil {
responses := op.Responses
if err := expandResponse(responses.Default, resolver); err != nil {
return err
}
for code, response := range responses.StatusCodeResponses {
if err := expandResponse(&response, resolver); err != nil {
return err
}
responses.StatusCodeResponses[code] = response
}
}
return nil
}
func expandResponse(response *Response, resolver *schemaLoader) error {
if response == nil {
return nil
}
if response.Ref.String() != "" {
if err := resolver.Resolve(&response.Ref, response); err != nil {
return err
}
}
if response.Schema != nil {
parentRefs := []string{response.Schema.Ref.String()}
if err := resolver.Resolve(&response.Schema.Ref, &response.Schema); err != nil {
return err
}
if s, err := expandSchema(*response.Schema, parentRefs, resolver); err != nil {
return err
} else {
*response.Schema = *s
}
}
return nil
}
func expandParameter(parameter *Parameter, resolver *schemaLoader) error {
if parameter == nil {
return nil
}
if parameter.Ref.String() != "" {
if err := resolver.Resolve(&parameter.Ref, parameter); err != nil {
return err
}
}
if parameter.Schema != nil {
parentRefs := []string{parameter.Schema.Ref.String()}
if err := resolver.Resolve(&parameter.Schema.Ref, &parameter.Schema); err != nil {
return err
}
if s, err := expandSchema(*parameter.Schema, parentRefs, resolver); err != nil {
return err
} else {
*parameter.Schema = *s
}
}
return nil
}