local-server/vendor/github.com/go-openapi/spec/expander.go
2019-02-04 13:56:43 +11:00

1228 lines
35 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"
"log"
"net/url"
"os"
"path"
"path/filepath"
"reflect"
"strings"
"sync"
"github.com/go-openapi/jsonpointer"
"github.com/go-openapi/swag"
)
// ExpandOptions provides options for expand.
type ExpandOptions struct {
RelativeBase string
SkipSchemas bool
ContinueOnError bool
AbsoluteCircularRef bool
}
// ResolutionCache a cache for resolving urls
type ResolutionCache interface {
Get(string) (interface{}, bool)
Set(string, interface{})
}
type simpleCache struct {
lock sync.RWMutex
store map[string]interface{}
}
var resCache ResolutionCache
func init() {
resCache = initResolutionCache()
}
// initResolutionCache initializes the URI resolution cache
func initResolutionCache() ResolutionCache {
return &simpleCache{store: map[string]interface{}{
"http://swagger.io/v2/schema.json": MustLoadSwagger20Schema(),
"http://json-schema.org/draft-04/schema": MustLoadJSONSchemaDraft04(),
}}
}
// resolverContext allows to share a context during spec processing.
// At the moment, it just holds the index of circular references found.
type resolverContext struct {
// circulars holds all visited circular references, which allows shortcuts.
// NOTE: this is not just a performance improvement: it is required to figure out
// circular references which participate several cycles.
// This structure is privately instantiated and needs not be locked against
// concurrent access, unless we chose to implement a parallel spec walking.
circulars map[string]bool
basePath string
}
func newResolverContext(originalBasePath string) *resolverContext {
return &resolverContext{
circulars: make(map[string]bool),
basePath: originalBasePath, // keep the root base path in context
}
}
// Get retrieves a cached URI
func (s *simpleCache) Get(uri string) (interface{}, bool) {
debugLog("getting %q from resolution cache", uri)
s.lock.RLock()
v, ok := s.store[uri]
debugLog("got %q from resolution cache: %t", uri, ok)
s.lock.RUnlock()
return v, ok
}
// Set caches a URI
func (s *simpleCache) Set(uri string, data interface{}) {
s.lock.Lock()
s.store[uri] = data
s.lock.Unlock()
}
// ResolveRefWithBase resolves a reference against a context root with preservation of base path
func ResolveRefWithBase(root interface{}, ref *Ref, opts *ExpandOptions) (*Schema, error) {
resolver, err := defaultSchemaLoader(root, opts, nil, nil)
if err != nil {
return nil, err
}
specBasePath := ""
if opts != nil && opts.RelativeBase != "" {
specBasePath, _ = absPath(opts.RelativeBase)
}
result := new(Schema)
if err := resolver.Resolve(ref, result, specBasePath); err != nil {
return nil, err
}
return result, nil
}
// ResolveRef resolves a reference against a context root
// ref is guaranteed to be in root (no need to go to external files)
// ResolveRef is ONLY called from the code generation module
func ResolveRef(root interface{}, ref *Ref) (*Schema, error) {
res, _, err := ref.GetPointer().Get(root)
if err != nil {
panic(err)
}
switch sch := res.(type) {
case Schema:
return &sch, nil
case *Schema:
return sch, nil
case map[string]interface{}:
b, _ := json.Marshal(sch)
newSch := new(Schema)
_ = json.Unmarshal(b, newSch)
return newSch, nil
default:
return nil, fmt.Errorf("unknown type for the resolved reference")
}
}
// ResolveParameter resolves a parameter reference against a context root
func ResolveParameter(root interface{}, ref Ref) (*Parameter, error) {
return ResolveParameterWithBase(root, ref, nil)
}
// ResolveParameterWithBase resolves a parameter reference against a context root and base path
func ResolveParameterWithBase(root interface{}, ref Ref, opts *ExpandOptions) (*Parameter, error) {
resolver, err := defaultSchemaLoader(root, opts, 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) {
return ResolveResponseWithBase(root, ref, nil)
}
// ResolveResponseWithBase resolves response a reference against a context root and base path
func ResolveResponseWithBase(root interface{}, ref Ref, opts *ExpandOptions) (*Response, error) {
resolver, err := defaultSchemaLoader(root, opts, 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
}
// ResolveItems resolves header and parameter items reference against a context root and base path
func ResolveItems(root interface{}, ref Ref, opts *ExpandOptions) (*Items, error) {
resolver, err := defaultSchemaLoader(root, opts, nil, nil)
if err != nil {
return nil, err
}
basePath := ""
if opts.RelativeBase != "" {
basePath = opts.RelativeBase
}
result := new(Items)
if err := resolver.Resolve(&ref, result, basePath); err != nil {
return nil, err
}
return result, nil
}
// ResolvePathItem resolves response a path item against a context root and base path
func ResolvePathItem(root interface{}, ref Ref, opts *ExpandOptions) (*PathItem, error) {
resolver, err := defaultSchemaLoader(root, opts, nil, nil)
if err != nil {
return nil, err
}
basePath := ""
if opts.RelativeBase != "" {
basePath = opts.RelativeBase
}
result := new(PathItem)
if err := resolver.Resolve(&ref, result, basePath); err != nil {
return nil, err
}
return result, nil
}
type schemaLoader struct {
root interface{}
options *ExpandOptions
cache ResolutionCache
context *resolverContext
loadDoc func(string) (json.RawMessage, error)
}
var idPtr, _ = jsonpointer.New("/id")
var refPtr, _ = jsonpointer.New("/$ref")
// PathLoader function to use when loading remote refs
var PathLoader func(string) (json.RawMessage, error)
func init() {
PathLoader = func(path string) (json.RawMessage, error) {
data, err := swag.LoadFromFileOrHTTP(path)
if err != nil {
return nil, err
}
return json.RawMessage(data), nil
}
}
func defaultSchemaLoader(
root interface{},
expandOptions *ExpandOptions,
cache ResolutionCache,
context *resolverContext) (*schemaLoader, error) {
if cache == nil {
cache = resCache
}
if expandOptions == nil {
expandOptions = &ExpandOptions{}
}
absBase, _ := absPath(expandOptions.RelativeBase)
if context == nil {
context = newResolverContext(absBase)
}
return &schemaLoader{
root: root,
options: expandOptions,
cache: cache,
context: context,
loadDoc: func(path string) (json.RawMessage, error) {
debugLog("fetching document at %q", path)
return PathLoader(path)
},
}, 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 {
var rf Ref
switch value := refRef.(type) {
case string:
rf, _ = NewRef(value)
}
nw, err := ret.Inherits(rf)
if err != nil {
break
}
nwURL := nw.GetURL()
if nwURL.Scheme == "file" || (nwURL.Scheme == "" && nwURL.Host == "") {
nwpt := filepath.ToSlash(nwURL.Path)
if filepath.IsAbs(nwpt) {
_, err := os.Stat(nwpt)
if err != nil {
nwURL.Path = filepath.Join(".", nwpt)
}
}
}
ret = nw
}
}
return ret
}
// normalize absolute path for cache.
// on Windows, drive letters should be converted to lower as scheme in net/url.URL
func normalizeAbsPath(path string) string {
u, err := url.Parse(path)
if err != nil {
debugLog("normalize absolute path failed: %s", err)
return path
}
return u.String()
}
// base or refPath could be a file path or a URL
// given a base absolute path and a ref path, return the absolute path of refPath
// 1) if refPath is absolute, return it
// 2) if refPath is relative, join it with basePath keeping the scheme, hosts, and ports if exists
// base could be a directory or a full file path
func normalizePaths(refPath, base string) string {
refURL, _ := url.Parse(refPath)
if path.IsAbs(refURL.Path) || filepath.IsAbs(refPath) {
// refPath is actually absolute
if refURL.Host != "" {
return refPath
}
parts := strings.Split(refPath, "#")
result := filepath.FromSlash(parts[0])
if len(parts) == 2 {
result += "#" + parts[1]
}
return result
}
// relative refPath
baseURL, _ := url.Parse(base)
if !strings.HasPrefix(refPath, "#") {
// combining paths
if baseURL.Host != "" {
baseURL.Path = path.Join(path.Dir(baseURL.Path), refURL.Path)
} else { // base is a file
newBase := fmt.Sprintf("%s#%s", filepath.Join(filepath.Dir(base), filepath.FromSlash(refURL.Path)), refURL.Fragment)
return newBase
}
}
// copying fragment from ref to base
baseURL.Fragment = refURL.Fragment
return baseURL.String()
}
// denormalizePaths returns to simplest notation on file $ref,
// i.e. strips the absolute path and sets a path relative to the base path.
//
// This is currently used when we rewrite ref after a circular ref has been detected
func denormalizeFileRef(ref *Ref, relativeBase, originalRelativeBase string) *Ref {
debugLog("denormalizeFileRef for: %s", ref.String())
if ref.String() == "" || ref.IsRoot() || ref.HasFragmentOnly {
return ref
}
// strip relativeBase from URI
relativeBaseURL, _ := url.Parse(relativeBase)
relativeBaseURL.Fragment = ""
if relativeBaseURL.IsAbs() && strings.HasPrefix(ref.String(), relativeBase) {
// this should work for absolute URI (e.g. http://...): we have an exact match, just trim prefix
r, _ := NewRef(strings.TrimPrefix(ref.String(), relativeBase))
return &r
}
if relativeBaseURL.IsAbs() {
// other absolute URL get unchanged (i.e. with a non-empty scheme)
return ref
}
// for relative file URIs:
originalRelativeBaseURL, _ := url.Parse(originalRelativeBase)
originalRelativeBaseURL.Fragment = ""
if strings.HasPrefix(ref.String(), originalRelativeBaseURL.String()) {
// the resulting ref is in the expanded spec: return a local ref
r, _ := NewRef(strings.TrimPrefix(ref.String(), originalRelativeBaseURL.String()))
return &r
}
// check if we may set a relative path, considering the original base path for this spec.
// Example:
// spec is located at /mypath/spec.json
// my normalized ref points to: /mypath/item.json#/target
// expected result: item.json#/target
parts := strings.Split(ref.String(), "#")
relativePath, err := filepath.Rel(path.Dir(originalRelativeBaseURL.String()), parts[0])
if err != nil {
// there is no common ancestor (e.g. different drives on windows)
// leaves the ref unchanged
return ref
}
if len(parts) == 2 {
relativePath += "#" + parts[1]
}
r, _ := NewRef(relativePath)
return &r
}
// relativeBase could be an ABSOLUTE file path or an ABSOLUTE URL
func normalizeFileRef(ref *Ref, relativeBase string) *Ref {
// This is important for when the reference is pointing to the root schema
if ref.String() == "" {
r, _ := NewRef(relativeBase)
return &r
}
debugLog("normalizing %s against %s", ref.String(), relativeBase)
s := normalizePaths(ref.String(), relativeBase)
r, _ := NewRef(s)
return &r
}
func (r *schemaLoader) resolveRef(ref *Ref, target interface{}, basePath string) error {
tgt := reflect.ValueOf(target)
if tgt.Kind() != reflect.Ptr {
return fmt.Errorf("resolve ref: target needs to be a pointer")
}
refURL := ref.GetURL()
if refURL == nil {
return nil
}
var res interface{}
var data interface{}
var err error
// Resolve against the root if it isn't nil, and if ref is pointing at the root, or has a fragment only which means
// it is pointing somewhere in the root.
root := r.root
if (ref.IsRoot() || ref.HasFragmentOnly) && root == nil && basePath != "" {
if baseRef, erb := NewRef(basePath); erb == nil {
root, _, _, _ = r.load(baseRef.GetURL())
}
}
if (ref.IsRoot() || ref.HasFragmentOnly) && root != nil {
data = root
} else {
baseRef := normalizeFileRef(ref, basePath)
debugLog("current ref is: %s", ref.String())
debugLog("current ref normalized file: %s", baseRef.String())
data, _, _, err = r.load(baseRef.GetURL())
if err != nil {
return err
}
}
res = data
if ref.String() != "" {
res, _, err = ref.GetPointer().Get(data)
if err != nil {
return err
}
}
if err := swag.DynamicJSONToStruct(res, target); err != nil {
return err
}
return nil
}
func (r *schemaLoader) load(refURL *url.URL) (interface{}, url.URL, bool, error) {
debugLog("loading schema from url: %s", refURL)
toFetch := *refURL
toFetch.Fragment = ""
normalized := normalizeAbsPath(toFetch.String())
data, fromCache := r.cache.Get(normalized)
if !fromCache {
b, err := r.loadDoc(normalized)
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(normalized, data)
}
return data, toFetch, fromCache, nil
}
// Resolve resolves a reference against basePath and stores the result in target
// Resolve is not in charge of following references, it only resolves ref by following its URL
// if the schema that ref is referring to has more refs in it. Resolve doesn't resolve them
// if basePath is an empty string, ref is resolved against the root schema stored in the schemaLoader struct
func (r *schemaLoader) Resolve(ref *Ref, target interface{}, basePath string) error {
return r.resolveRef(ref, target, basePath)
}
// absPath returns the absolute path of a file
func absPath(fname string) (string, error) {
if strings.HasPrefix(fname, "http") {
return fname, nil
}
if filepath.IsAbs(fname) {
return fname, nil
}
wd, err := os.Getwd()
return filepath.Join(wd, fname), err
}
// ExpandSpec expands the references in a swagger spec
func ExpandSpec(spec *Swagger, options *ExpandOptions) error {
resolver, err := defaultSchemaLoader(spec, options, nil, nil)
// Just in case this ever returns an error.
if shouldStopOnError(err, resolver.options) {
return err
}
// getting the base path of the spec to adjust all subsequent reference resolutions
specBasePath := ""
if options != nil && options.RelativeBase != "" {
specBasePath, _ = absPath(options.RelativeBase)
}
if options == nil || !options.SkipSchemas {
for key, definition := range spec.Definitions {
var def *Schema
var err error
if def, err = expandSchema(definition, []string{fmt.Sprintf("#/definitions/%s", key)}, resolver, specBasePath); shouldStopOnError(err, resolver.options) {
return err
}
if def != nil {
spec.Definitions[key] = *def
}
}
}
for key, parameter := range spec.Parameters {
if err := expandParameter(&parameter, resolver, specBasePath); shouldStopOnError(err, resolver.options) {
return err
}
spec.Parameters[key] = parameter
}
for key, response := range spec.Responses {
if err := expandResponse(&response, resolver, specBasePath); shouldStopOnError(err, resolver.options) {
return err
}
spec.Responses[key] = response
}
if spec.Paths != nil {
for key, path := range spec.Paths.Paths {
if err := expandPathItem(&path, resolver, specBasePath); shouldStopOnError(err, resolver.options) {
return err
}
spec.Paths.Paths[key] = path
}
}
return nil
}
func shouldStopOnError(err error, opts *ExpandOptions) bool {
if err != nil && !opts.ContinueOnError {
return true
}
if err != nil {
log.Println(err)
}
return false
}
// baseForRoot loads in the cache the root document and produces a fake "root" base path entry
// for further $ref resolution
func baseForRoot(root interface{}, cache ResolutionCache) string {
// cache the root document to resolve $ref's
const rootBase = "root"
if root != nil {
base, _ := absPath(rootBase)
normalizedBase := normalizeAbsPath(base)
debugLog("setting root doc in cache at: %s", normalizedBase)
if cache == nil {
cache = resCache
}
cache.Set(normalizedBase, root)
return rootBase
}
return ""
}
// ExpandSchema expands the refs in the schema object with reference to the root object
// go-openapi/validate uses this function
// notice that it is impossible to reference a json schema in a different file other than root
func ExpandSchema(schema *Schema, root interface{}, cache ResolutionCache) error {
opts := &ExpandOptions{
// when a root is specified, cache the root as an in-memory document for $ref retrieval
RelativeBase: baseForRoot(root, cache),
SkipSchemas: false,
ContinueOnError: false,
// when no base path is specified, remaining $ref (circular) are rendered with an absolute path
AbsoluteCircularRef: true,
}
return ExpandSchemaWithBasePath(schema, cache, opts)
}
// ExpandSchemaWithBasePath expands the refs in the schema object, base path configured through expand options
func ExpandSchemaWithBasePath(schema *Schema, cache ResolutionCache, opts *ExpandOptions) error {
if schema == nil {
return nil
}
var basePath string
if opts.RelativeBase != "" {
basePath, _ = absPath(opts.RelativeBase)
}
resolver, err := defaultSchemaLoader(nil, opts, cache, nil)
if err != nil {
return err
}
refs := []string{""}
var s *Schema
if s, err = expandSchema(*schema, refs, resolver, basePath); err != nil {
return err
}
*schema = *s
return nil
}
func expandItems(target Schema, parentRefs []string, resolver *schemaLoader, basePath string) (*Schema, error) {
if target.Items != nil {
if target.Items.Schema != nil {
t, err := expandSchema(*target.Items.Schema, parentRefs, resolver, basePath)
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, basePath)
if err != nil {
return nil, err
}
target.Items.Schemas[i] = *t
}
}
return &target, nil
}
// basePathFromSchemaID returns a new basePath based on an existing basePath and a schema ID
func basePathFromSchemaID(oldBasePath, id string) string {
u, err := url.Parse(oldBasePath)
if err != nil {
panic(err)
}
uid, err := url.Parse(id)
if err != nil {
panic(err)
}
if path.IsAbs(uid.Path) {
return id
}
u.Path = path.Join(path.Dir(u.Path), uid.Path)
return u.String()
}
// isCircular detects cycles in sequences of $ref.
// It relies on a private context (which needs not be locked).
func (r *schemaLoader) isCircular(ref *Ref, basePath string, parentRefs ...string) (foundCycle bool) {
normalizedRef := normalizePaths(ref.String(), basePath)
if _, ok := r.context.circulars[normalizedRef]; ok {
// circular $ref has been already detected in another explored cycle
foundCycle = true
return
}
foundCycle = swag.ContainsStringsCI(parentRefs, normalizedRef)
if foundCycle {
r.context.circulars[normalizedRef] = true
}
return
}
func updateBasePath(transitive *schemaLoader, resolver *schemaLoader, basePath string) string {
if transitive != resolver {
debugLog("got a new resolver")
if transitive.options != nil && transitive.options.RelativeBase != "" {
basePath, _ = absPath(transitive.options.RelativeBase)
debugLog("new basePath = %s", basePath)
}
}
return basePath
}
func expandSchema(target Schema, parentRefs []string, resolver *schemaLoader, basePath string) (*Schema, error) {
if target.Ref.String() == "" && target.Ref.IsRoot() {
// normalizing is important
newRef := normalizeFileRef(&target.Ref, basePath)
target.Ref = *newRef
return &target, nil
}
/* change the base path of resolution when an ID is encountered
otherwise the basePath should inherit the parent's */
// important: ID can be relative path
if target.ID != "" {
debugLog("schema has ID: %s", target.ID)
// handling the case when id is a folder
// remember that basePath has to be a file
refPath := target.ID
if strings.HasSuffix(target.ID, "/") {
// path.Clean here would not work correctly if basepath is http
refPath = fmt.Sprintf("%s%s", refPath, "placeholder.json")
}
basePath = normalizePaths(refPath, basePath)
}
/* Explain here what this function does */
var t *Schema
/* if Ref is found, everything else doesn't matter */
/* Ref also changes the resolution scope of children expandSchema */
if target.Ref.String() != "" {
/* Here the resolution scope is changed because a $ref was encountered */
normalizedRef := normalizeFileRef(&target.Ref, basePath)
normalizedBasePath := normalizedRef.RemoteURI()
if resolver.isCircular(normalizedRef, basePath, parentRefs...) {
// this means there is a cycle in the recursion tree: return the Ref
// - circular refs cannot be expanded. We leave them as ref.
// - denormalization means that a new local file ref is set relative to the original basePath
debugLog("shortcut circular ref: basePath: %s, normalizedPath: %s, normalized ref: %s",
basePath, normalizedBasePath, normalizedRef.String())
if !resolver.options.AbsoluteCircularRef {
target.Ref = *denormalizeFileRef(normalizedRef, normalizedBasePath, resolver.context.basePath)
} else {
target.Ref = *normalizedRef
}
return &target, nil
}
debugLog("basePath: %s", basePath)
if Debug {
b, _ := json.Marshal(target)
debugLog("calling Resolve with target: %s", string(b))
}
if err := resolver.Resolve(&target.Ref, &t, basePath); shouldStopOnError(err, resolver.options) {
return nil, err
}
if t != nil {
parentRefs = append(parentRefs, normalizedRef.String())
var err error
transitiveResolver, err := transitiveResolver(basePath, target.Ref, resolver)
if shouldStopOnError(err, resolver.options) {
return nil, err
}
basePath = updateBasePath(transitiveResolver, resolver, normalizedBasePath)
return expandSchema(*t, parentRefs, transitiveResolver, basePath)
}
}
t, err := expandItems(target, parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
target = *t
}
for i := range target.AllOf {
t, err := expandSchema(target.AllOf[i], parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
target.AllOf[i] = *t
}
for i := range target.AnyOf {
t, err := expandSchema(target.AnyOf[i], parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
target.AnyOf[i] = *t
}
for i := range target.OneOf {
t, err := expandSchema(target.OneOf[i], parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
target.OneOf[i] = *t
}
}
if target.Not != nil {
t, err := expandSchema(*target.Not, parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
*target.Not = *t
}
}
for k := range target.Properties {
t, err := expandSchema(target.Properties[k], parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
target.Properties[k] = *t
}
}
if target.AdditionalProperties != nil && target.AdditionalProperties.Schema != nil {
t, err := expandSchema(*target.AdditionalProperties.Schema, parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
*target.AdditionalProperties.Schema = *t
}
}
for k := range target.PatternProperties {
t, err := expandSchema(target.PatternProperties[k], parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
target.PatternProperties[k] = *t
}
}
for k := range target.Dependencies {
if target.Dependencies[k].Schema != nil {
t, err := expandSchema(*target.Dependencies[k].Schema, parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
*target.Dependencies[k].Schema = *t
}
}
}
if target.AdditionalItems != nil && target.AdditionalItems.Schema != nil {
t, err := expandSchema(*target.AdditionalItems.Schema, parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
*target.AdditionalItems.Schema = *t
}
}
for k := range target.Definitions {
t, err := expandSchema(target.Definitions[k], parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return &target, err
}
if t != nil {
target.Definitions[k] = *t
}
}
return &target, nil
}
func derefPathItem(pathItem *PathItem, parentRefs []string, resolver *schemaLoader, basePath string) error {
curRef := pathItem.Ref.String()
if curRef != "" {
normalizedRef := normalizeFileRef(&pathItem.Ref, basePath)
normalizedBasePath := normalizedRef.RemoteURI()
if resolver.isCircular(normalizedRef, basePath, parentRefs...) {
return nil
}
if err := resolver.Resolve(&pathItem.Ref, pathItem, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if pathItem.Ref.String() != "" && pathItem.Ref.String() != curRef && basePath != normalizedBasePath {
parentRefs = append(parentRefs, normalizedRef.String())
return derefPathItem(pathItem, parentRefs, resolver, normalizedBasePath)
}
}
return nil
}
func expandPathItem(pathItem *PathItem, resolver *schemaLoader, basePath string) error {
if pathItem == nil {
return nil
}
parentRefs := []string{}
if err := derefPathItem(pathItem, parentRefs, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if pathItem.Ref.String() != "" {
var err error
resolver, err = transitiveResolver(basePath, pathItem.Ref, resolver)
if shouldStopOnError(err, resolver.options) {
return err
}
}
pathItem.Ref = Ref{}
// Currently unused:
//parentRefs = parentRefs[0:]
for idx := range pathItem.Parameters {
if err := expandParameter(&(pathItem.Parameters[idx]), resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
}
if err := expandOperation(pathItem.Get, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if err := expandOperation(pathItem.Head, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if err := expandOperation(pathItem.Options, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if err := expandOperation(pathItem.Put, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if err := expandOperation(pathItem.Post, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if err := expandOperation(pathItem.Patch, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if err := expandOperation(pathItem.Delete, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
return nil
}
func expandOperation(op *Operation, resolver *schemaLoader, basePath string) error {
if op == nil {
return nil
}
for i, param := range op.Parameters {
if err := expandParameter(&param, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
op.Parameters[i] = param
}
if op.Responses != nil {
responses := op.Responses
if err := expandResponse(responses.Default, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
for code, response := range responses.StatusCodeResponses {
if err := expandResponse(&response, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
responses.StatusCodeResponses[code] = response
}
}
return nil
}
func transitiveResolver(basePath string, ref Ref, resolver *schemaLoader) (*schemaLoader, error) {
if ref.IsRoot() || ref.HasFragmentOnly {
return resolver, nil
}
baseRef, _ := NewRef(basePath)
currentRef := normalizeFileRef(&ref, basePath)
// Set a new root to resolve against
if !strings.HasPrefix(currentRef.String(), baseRef.String()) {
rootURL := currentRef.GetURL()
rootURL.Fragment = ""
root, _ := resolver.cache.Get(rootURL.String())
var err error
// shallow copy of resolver options to set a new RelativeBase when
// traversing multiple documents
newOptions := resolver.options
newOptions.RelativeBase = rootURL.String()
debugLog("setting new root: %s", newOptions.RelativeBase)
resolver, err = defaultSchemaLoader(root, newOptions, resolver.cache, resolver.context)
if err != nil {
return nil, err
}
}
return resolver, nil
}
// ExpandResponseWithRoot expands a response based on a root document, not a fetchable document
func ExpandResponseWithRoot(response *Response, root interface{}, cache ResolutionCache) error {
opts := &ExpandOptions{
RelativeBase: baseForRoot(root, cache),
SkipSchemas: false,
ContinueOnError: false,
// when no base path is specified, remaining $ref (circular) are rendered with an absolute path
AbsoluteCircularRef: true,
}
resolver, err := defaultSchemaLoader(root, opts, nil, nil)
if err != nil {
return err
}
return expandResponse(response, resolver, opts.RelativeBase)
}
// ExpandResponse expands a response based on a basepath
// This is the exported version of expandResponse
// all refs inside response will be resolved relative to basePath
func ExpandResponse(response *Response, basePath string) error {
var specBasePath string
if basePath != "" {
specBasePath, _ = absPath(basePath)
}
opts := &ExpandOptions{
RelativeBase: specBasePath,
}
resolver, err := defaultSchemaLoader(nil, opts, nil, nil)
if err != nil {
return err
}
return expandResponse(response, resolver, opts.RelativeBase)
}
func derefResponse(response *Response, parentRefs []string, resolver *schemaLoader, basePath string) error {
curRef := response.Ref.String()
if curRef != "" {
/* Here the resolution scope is changed because a $ref was encountered */
normalizedRef := normalizeFileRef(&response.Ref, basePath)
normalizedBasePath := normalizedRef.RemoteURI()
if resolver.isCircular(normalizedRef, basePath, parentRefs...) {
return nil
}
if err := resolver.Resolve(&response.Ref, response, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if response.Ref.String() != "" && response.Ref.String() != curRef && basePath != normalizedBasePath {
parentRefs = append(parentRefs, normalizedRef.String())
return derefResponse(response, parentRefs, resolver, normalizedBasePath)
}
}
return nil
}
func expandResponse(response *Response, resolver *schemaLoader, basePath string) error {
if response == nil {
return nil
}
parentRefs := []string{}
if err := derefResponse(response, parentRefs, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if response.Ref.String() != "" {
transitiveResolver, err := transitiveResolver(basePath, response.Ref, resolver)
if shouldStopOnError(err, transitiveResolver.options) {
return err
}
basePath = updateBasePath(transitiveResolver, resolver, basePath)
resolver = transitiveResolver
}
if response.Schema != nil && response.Schema.Ref.String() != "" {
// schema expanded to a $ref in another root
var ern error
response.Schema.Ref, ern = NewRef(normalizePaths(response.Schema.Ref.String(), response.Ref.RemoteURI()))
if ern != nil {
return ern
}
}
response.Ref = Ref{}
parentRefs = parentRefs[0:]
if !resolver.options.SkipSchemas && response.Schema != nil {
// parentRefs = append(parentRefs, response.Schema.Ref.String())
s, err := expandSchema(*response.Schema, parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return err
}
*response.Schema = *s
}
return nil
}
// ExpandParameterWithRoot expands a parameter based on a root document, not a fetchable document
func ExpandParameterWithRoot(parameter *Parameter, root interface{}, cache ResolutionCache) error {
opts := &ExpandOptions{
RelativeBase: baseForRoot(root, cache),
SkipSchemas: false,
ContinueOnError: false,
// when no base path is specified, remaining $ref (circular) are rendered with an absolute path
AbsoluteCircularRef: true,
}
resolver, err := defaultSchemaLoader(root, opts, nil, nil)
if err != nil {
return err
}
return expandParameter(parameter, resolver, opts.RelativeBase)
}
// ExpandParameter expands a parameter based on a basepath
// This is the exported version of expandParameter
// all refs inside parameter will be resolved relative to basePath
func ExpandParameter(parameter *Parameter, basePath string) error {
var specBasePath string
if basePath != "" {
specBasePath, _ = absPath(basePath)
}
opts := &ExpandOptions{
RelativeBase: specBasePath,
}
resolver, err := defaultSchemaLoader(nil, opts, nil, nil)
if err != nil {
return err
}
return expandParameter(parameter, resolver, opts.RelativeBase)
}
func derefParameter(parameter *Parameter, parentRefs []string, resolver *schemaLoader, basePath string) error {
curRef := parameter.Ref.String()
if curRef != "" {
normalizedRef := normalizeFileRef(&parameter.Ref, basePath)
normalizedBasePath := normalizedRef.RemoteURI()
if resolver.isCircular(normalizedRef, basePath, parentRefs...) {
return nil
}
if err := resolver.Resolve(&parameter.Ref, parameter, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if parameter.Ref.String() != "" && parameter.Ref.String() != curRef && basePath != normalizedBasePath {
parentRefs = append(parentRefs, normalizedRef.String())
return derefParameter(parameter, parentRefs, resolver, normalizedBasePath)
}
}
return nil
}
func expandParameter(parameter *Parameter, resolver *schemaLoader, basePath string) error {
if parameter == nil {
return nil
}
parentRefs := []string{}
if err := derefParameter(parameter, parentRefs, resolver, basePath); shouldStopOnError(err, resolver.options) {
return err
}
if parameter.Ref.String() != "" {
transitiveResolver, err := transitiveResolver(basePath, parameter.Ref, resolver)
if shouldStopOnError(err, transitiveResolver.options) {
return err
}
basePath = updateBasePath(transitiveResolver, resolver, basePath)
resolver = transitiveResolver
}
if parameter.Schema != nil && parameter.Schema.Ref.String() != "" {
// schema expanded to a $ref in another root
var ern error
parameter.Schema.Ref, ern = NewRef(normalizePaths(parameter.Schema.Ref.String(), parameter.Ref.RemoteURI()))
if ern != nil {
return ern
}
}
parameter.Ref = Ref{}
parentRefs = parentRefs[0:]
if !resolver.options.SkipSchemas && parameter.Schema != nil {
s, err := expandSchema(*parameter.Schema, parentRefs, resolver, basePath)
if shouldStopOnError(err, resolver.options) {
return err
}
*parameter.Schema = *s
}
return nil
}