Revert "openapi3: process discriminator mapping values as refs"

.github/docs/openapi3.txt

@@ -411,8 +411,8 @@ type Discriminator struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 	Origin     *Origin        `json:"origin,omitempty" yaml:"origin,omitempty"`
 
-	PropertyName string                `json:"propertyName" yaml:"propertyName"` // required
-	Mapping      StringMap[MappingRef] `json:"mapping,omitempty" yaml:"mapping,omitempty"`
+	PropertyName string    `json:"propertyName" yaml:"propertyName"` // required
+	Mapping      StringMap `json:"mapping,omitempty" yaml:"mapping,omitempty"`
 }
     Discriminator is specified by OpenAPI/Swagger standard version 3. See
     https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#discriminator-object
@@ -831,15 +831,6 @@ type Location struct {
 }
     Location is a struct that contains the location of a field.
 
-type MappingRef SchemaRef
-    MappingRef is a ref to a Schema objects. Unlike SchemaRefs it is serialised
-    as a plain string instead of an object with a $ref key, as such it also does
-    not support extensions.
-
-func (mr MappingRef) MarshalText() ([]byte, error)
-
-func (mr *MappingRef) UnmarshalText(data []byte) error
-
 type MediaType struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 	Origin     *Origin        `json:"origin,omitempty" yaml:"origin,omitempty"`
@@ -922,10 +913,10 @@ type OAuthFlow struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 	Origin     *Origin        `json:"origin,omitempty" yaml:"origin,omitempty"`
 
-	AuthorizationURL string            `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
-	TokenURL         string            `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
-	RefreshURL       string            `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
-	Scopes           StringMap[string] `json:"scopes" yaml:"scopes"` // required
+	AuthorizationURL string    `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
+	TokenURL         string    `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
+	RefreshURL       string    `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
+	Scopes           StringMap `json:"scopes" yaml:"scopes"` // required
 }
     OAuthFlow is specified by OpenAPI/Swagger standard version 3. See
     https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#oauth-flow-object
@@ -2076,11 +2067,11 @@ func NewRegexpFormatValidator(pattern string) StringFormatValidator
     NewRegexpFormatValidator creates a new FormatValidator that uses a regular
     expression to validate the value.
 
-type StringMap[V any] map[string]V
+type StringMap map[string]string
     StringMap is a map[string]string that ignores the origin in the underlying
     json representation.
 
-func (stringMap *StringMap[V]) UnmarshalJSON(data []byte) (err error)
+func (stringMap *StringMap) UnmarshalJSON(data []byte) (err error)
     UnmarshalJSON sets StringMap to a copy of data.
 
 type T struct {

openapi3/discriminator.go

@@ -11,22 +11,8 @@ type Discriminator struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 	Origin     *Origin        `json:"origin,omitempty" yaml:"origin,omitempty"`
 
-	PropertyName string                `json:"propertyName" yaml:"propertyName"` // required
-	Mapping      StringMap[MappingRef] `json:"mapping,omitempty" yaml:"mapping,omitempty"`
-}
-
-// MappingRef is a ref to a Schema objects. Unlike SchemaRefs it is serialised
-// as a plain string instead of an object with a $ref key, as such it also does
-// not support extensions.
-type MappingRef SchemaRef
-
-func (mr *MappingRef) UnmarshalText(data []byte) error {
-	mr.Ref = string(data)
-	return nil
-}
-
-func (mr MappingRef) MarshalText() ([]byte, error) {
-	return []byte(mr.Ref), nil
+	PropertyName string    `json:"propertyName" yaml:"propertyName"` // required
+	Mapping      StringMap `json:"mapping,omitempty" yaml:"mapping,omitempty"`
 }
 
 // MarshalJSON returns the JSON encoding of Discriminator.

openapi3/internalize_refs.go

@@ -351,16 +351,6 @@ func (doc *T) derefSchema(s *Schema, refNameResolver RefNameResolver, parentIsEx
 			}
 		}
 	}
-	// Discriminator mapping values are special cases since they are not full
-	// ref objects but are string references to schema objects.
-	if s.Discriminator != nil && s.Discriminator.Mapping != nil {
-		for k, mapRef := range s.Discriminator.Mapping {
-			s2 := (*SchemaRef)(&mapRef)
-			isExternal := doc.addSchemaToSpec(s2, refNameResolver, parentIsExternal)
-			doc.derefSchema(s2.Value, refNameResolver, isExternal || parentIsExternal)
-			s.Discriminator.Mapping[k] = mapRef
-		}
-	}
 
 	for _, name := range componentNames(s.Properties) {
 		s2 := s.Properties[name]

openapi3/internalize_refs_test.go

@@ -25,7 +25,6 @@ func TestInternalizeRefs(t *testing.T) {
 		{"testdata/issue831/testref.internalizepath.openapi.yml"},
 		{"testdata/issue959/openapi.yml"},
 		{"testdata/interalizationNameCollision/api.yml"},
-		{"testdata/discriminator.yml"},
 	}
 
 	for _, test := range tests {

openapi3/loader.go

@@ -953,16 +953,6 @@ func (loader *Loader) resolveSchemaRef(doc *T, component *SchemaRef, documentPat
 			return err
 		}
 	}
-	// Discriminator mapping refs are a special case since they are not full
-	// ref objects but are plain strings that reference schema objects.
-	if value.Discriminator != nil && value.Discriminator.Mapping != nil {
-		for k, v := range value.Discriminator.Mapping {
-			if err := loader.resolveSchemaRef(doc, (*SchemaRef)(&v), documentPath, visited); err != nil {
-				return err
-			}
-			value.Discriminator.Mapping[k] = v
-		}
-	}
 	return nil
 }
 

openapi3/schema.go

@@ -1298,7 +1298,7 @@ func (schema *Schema) visitNotOperation(settings *schemaValidationSettings, valu
 func (schema *Schema) visitXOFOperations(settings *schemaValidationSettings, value any) (err error, run bool) {
 	var visitedOneOf, visitedAnyOf, visitedAllOf bool
 	if v := schema.OneOf; len(v) > 0 {
-		var discriminatorRef MappingRef
+		var discriminatorRef string
 		if schema.Discriminator != nil {
 			pn := schema.Discriminator.PropertyName
 			if valuemap, okcheck := value.(map[string]any); okcheck {
@@ -1344,7 +1344,7 @@ func (schema *Schema) visitXOFOperations(settings *schemaValidationSettings, val
 				return foundUnresolvedRef(item.Ref), false
 			}
 
-			if discriminatorRef.Ref != "" && discriminatorRef.Ref != item.Ref {
+			if discriminatorRef != "" && discriminatorRef != item.Ref {
 				continue
 			}
 

openapi3/security_scheme.go

@@ -322,10 +322,10 @@ type OAuthFlow struct {
 	Extensions map[string]any `json:"-" yaml:"-"`
 	Origin     *Origin        `json:"origin,omitempty" yaml:"origin,omitempty"`
 
-	AuthorizationURL string            `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
-	TokenURL         string            `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
-	RefreshURL       string            `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
-	Scopes           StringMap[string] `json:"scopes" yaml:"scopes"` // required
+	AuthorizationURL string    `json:"authorizationUrl,omitempty" yaml:"authorizationUrl,omitempty"`
+	TokenURL         string    `json:"tokenUrl,omitempty" yaml:"tokenUrl,omitempty"`
+	RefreshURL       string    `json:"refreshUrl,omitempty" yaml:"refreshUrl,omitempty"`
+	Scopes           StringMap `json:"scopes" yaml:"scopes"` // required
 }
 
 // MarshalJSON returns the JSON encoding of OAuthFlow.

openapi3/stringmap.go

@@ -3,11 +3,11 @@ package openapi3
 import "encoding/json"
 
 // StringMap is a map[string]string that ignores the origin in the underlying json representation.
-type StringMap[V any] map[string]V
+type StringMap map[string]string
 
 // UnmarshalJSON sets StringMap to a copy of data.
-func (stringMap *StringMap[V]) UnmarshalJSON(data []byte) (err error) {
-	*stringMap, _, err = unmarshalStringMap[V](data)
+func (stringMap *StringMap) UnmarshalJSON(data []byte) (err error) {
+	*stringMap, _, err = unmarshalStringMap[string](data)
 	return
 }