Пример #1
0
// Validate tests whether the resource definition is consistent: action names are valid and each action is
// valid.
func (r *ResourceDefinition) Validate(version *APIVersionDefinition) *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if r.Name == "" {
		verr.Add(r, "Resource name cannot be empty")
	}
	r.validateActions(version, verr)
	if r.BaseParams != nil {
		r.validateBaseParams(verr)
	}
	if r.ParentName != "" {
		r.validateParent(verr)
	}
	for _, resp := range r.Responses {
		verr.Merge(resp.Validate())
	}
	if r.Params != nil {
		verr.Merge(r.Params.Validate("resource parameters", r))
	}
	if !r.SupportsNoVersion() {
		if err := dslengine.CanUse(r, Design); err != nil {
			verr.Add(r, "Invalid API version in list")
		}
	}
	return verr.AsError()
}
Пример #2
0
// Validate checks that the link definition is consistent: it has a media type or the name of an
// attribute part of the parent media type.
func (l *LinkDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if l.Name == "" {
		verr.Add(l, "Links must have a name")
	}
	if l.Parent == nil {
		verr.Add(l, "Link must have a parent media type")
	}
	if l.Parent.ToObject() == nil {
		verr.Add(l, "Link parent media type must be an Object")
	}
	att, ok := l.Parent.ToObject()[l.Name]
	if !ok {
		verr.Add(l, "Link name must match one of the parent media type attribute names")
	} else {
		mediaType, ok := att.Type.(*MediaTypeDefinition)
		if !ok {
			verr.Add(l, "attribute type must be a media type")
		} else {
			viewFound := false
			view := l.View
			for v := range mediaType.Views {
				if v == view {
					viewFound = true
					break
				}
			}
			if !viewFound {
				verr.Add(l, "view %#v does not exist on target media type %#v", view, mediaType.Identifier)
			}
		}
	}
	return verr.AsError()
}
Пример #3
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// Validate tests whether the action definition is consistent: parameters have unique names and it has at least
// one response.
func (a *ActionDefinition) Validate(version *APIVersionDefinition) *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if a.Name == "" {
		verr.Add(a, "Action name cannot be empty")
	}
	if len(a.Routes) == 0 {
		verr.Add(a, "No route defined for action")
	}
	for i, r := range a.Responses {
		for j, r2 := range a.Responses {
			if i != j && r.Status == r2.Status {
				verr.Add(r, "Multiple response definitions with status code %d", r.Status)
			}
		}
		verr.Merge(r.Validate())
	}
	verr.Merge(a.ValidateParams(version))
	if a.Payload != nil {
		verr.Merge(a.Payload.Validate("action payload", a))
	}
	if a.Parent == nil {
		verr.Add(a, "missing parent resource")
	}
	return verr.AsError()
}
Пример #4
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// Validate checks that the user type definition is consistent: it has a name and all user and media
// types used in fields support the API versions that use the type.
func (u *UserTypeDefinition) Validate(ctx string, parent dslengine.Definition) *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if u.TypeName == "" {
		verr.Add(parent, "%s - %s", ctx, "User type must have a name")
	}
	if u.Type != nil {
		// u.Type can be nil when types refer to each other.
		if o := u.ToObject(); o != nil {
			o.IterateAttributes(func(name string, at *AttributeDefinition) error {
				var ut *UserTypeDefinition
				if mt, ok := at.Type.(*MediaTypeDefinition); ok {
					ut = mt.UserTypeDefinition
				} else if ut2, ok := at.Type.(*UserTypeDefinition); ok {
					ut = ut2
				}
				if ut != nil {
					if err := dslengine.CanUse(u, ut); err != nil {
						verr.Add(u, err.Error())
					}
				}
				return nil
			})
		}
	}
	verr.Merge(u.AttributeDefinition.Validate(ctx, parent))
	return verr.AsError()
}
Пример #5
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// Validate checks that the route definition is consistent: it has a parent.
func (r *RouteDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if r.Parent == nil {
		verr.Add(r, "missing route parent action")
	}
	return verr.AsError()
}
Пример #6
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// Validate checks that the user type definition is consistent: it has a name and the attribute
// backing the type is valid.
func (u *UserTypeDefinition) Validate(ctx string, parent dslengine.Definition) *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if u.TypeName == "" {
		verr.Add(parent, "%s - %s", ctx, "User type must have a name")
	}
	verr.Merge(u.AttributeDefinition.Validate(ctx, u))
	return verr.AsError()
}
Пример #7
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// Validate checks that the view definition is consistent: it has a  parent media type and the
// underlying definition type is consistent.
func (v *ViewDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if v.Parent == nil {
		verr.Add(v, "View must have a parent media type")
	}
	verr.Merge(v.AttributeDefinition.Validate("", v))
	return verr.AsError()
}
Пример #8
0
// Validate checks that the response definition is consistent: its status is set and the media
// type definition if any is valid.
func (r *ResponseDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if r.Headers != nil {
		verr.Merge(r.Headers.Validate("response headers", r))
	}
	if r.Status == 0 {
		verr.Add(r, "response status not defined")
	}
	return verr.AsError()
}
Пример #9
0
// Validate tests whether the attribute definition is consistent: required fields exist.
// Since attributes are unaware of their context, additional context information can be provided
// to be used in error messages.
// The parent definition context is automatically added to error messages.
func (a *AttributeDefinition) Validate(ctx string, parent dslengine.Definition) *dslengine.ValidationErrors {
	if validated[a] {
		return nil
	}
	validated[a] = true
	verr := new(dslengine.ValidationErrors)
	if a.Type == nil {
		verr.Add(parent, "attribute type is nil")
		return verr
	}
	if ctx != "" {
		ctx += " - "
	}
	// If both Default and Enum are given, make sure the Default value is one of Enum values.
	// TODO: We only do the default value and enum check just for primitive types.
	// Issue 388 (https://github.com/goadesign/goa/issues/388) will address this for other types.
	if a.Type.IsPrimitive() && a.DefaultValue != nil && a.Validation != nil && a.Validation.Values != nil {
		var found bool
		for _, e := range a.Validation.Values {
			if e == a.DefaultValue {
				found = true
				break
			}
		}
		if !found {
			verr.Add(parent, "%sdefault value %#v is not one of the accepted values: %#v", ctx, a.DefaultValue, a.Validation.Values)
		}
	}
	o := a.Type.ToObject()
	if o != nil {
		for _, n := range a.AllRequired() {
			found := false
			for an := range o {
				if n == an {
					found = true
					break
				}
			}
			if !found {
				verr.Add(parent, `%srequired field "%s" does not exist`, ctx, n)
			}
		}
		for n, att := range o {
			ctx = fmt.Sprintf("field %s", n)
			verr.Merge(att.Validate(ctx, parent))
		}
	} else {
		if a.Type.IsArray() {
			elemType := a.Type.ToArray().ElemType
			verr.Merge(elemType.Validate(ctx, a))
		}
	}

	return verr.AsError()
}
Пример #10
0
// Validate checks that the media type definition is consistent: its identifier is a valid media
// type identifier.
func (m *MediaTypeDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	verr.Merge(m.UserTypeDefinition.Validate("", m))
	if m.Type == nil { // TBD move this to somewhere else than validation code
		m.Type = String
	}
	var obj Object
	if a := m.Type.ToArray(); a != nil {
		if a.ElemType == nil {
			verr.Add(m, "array element type is nil")
		} else {
			if err := a.ElemType.Validate("array element", m); err != nil {
				verr.Merge(err)
			} else {
				if _, ok := a.ElemType.Type.(*MediaTypeDefinition); !ok {
					verr.Add(m, "collection media type array element type must be a media type, got %s", a.ElemType.Type.Name())
				} else {
					obj = a.ElemType.Type.ToObject()
				}
			}
		}
	} else {
		obj = m.Type.ToObject()
	}
	if obj != nil {
		for n, att := range obj {
			verr.Merge(att.Validate("attribute "+n, m))
			if att.View != "" {
				cmt, ok := att.Type.(*MediaTypeDefinition)
				if !ok {
					verr.Add(m, "attribute %s of media type defines a view for rendering but its type is not MediaTypeDefinition", n)
				}
				if _, ok := cmt.Views[att.View]; !ok {
					verr.Add(m, "attribute %s of media type uses unknown view %#v", n, att.View)
				}
			}
		}
	}
	if !m.Type.IsArray() {
		hasDefaultView := false
		for n, v := range m.Views {
			if n == "default" {
				hasDefaultView = true
			}
			verr.Merge(v.Validate())
		}
		if !hasDefaultView {
			verr.Add(m, `media type does not define the default view, use View("default", ...) to define it.`)
		}
	}
	for _, l := range m.Links {
		verr.Merge(l.Validate())
	}
	return verr.AsError()
}
Пример #11
0
// Validate tests whether the RelationalField definition is consistent.
func (field *RelationalFieldDefinition) Validate() *dslengine.ValidationErrors {
	fmt.Println("Validing Field")
	verr := new(dslengine.ValidationErrors)

	if field.Parent == nil {
		verr.Add(field, "missing relational model parent")
	}
	if field.Name == "" {
		verr.Add(field, "field name not defined")
	}
	return verr.AsError()
}
Пример #12
0
// Validate tests whether the StorageGroup definition is consistent.
func (a *StorageGroupDefinition) Validate() *dslengine.ValidationErrors {
	fmt.Println("Validating Group")
	verr := new(dslengine.ValidationErrors)
	if a.Name == "" {
		verr.Add(a, "storage group name not defined")
	}
	a.IterateStores(func(store *RelationalStoreDefinition) error {
		verr.Merge(store.Validate())
		return nil
	})

	return verr.AsError()
}
Пример #13
0
// Validate tests whether the RelationalStore definition is consistent.
func (a *RelationalStoreDefinition) Validate() *dslengine.ValidationErrors {
	fmt.Println("Validating Store")
	verr := new(dslengine.ValidationErrors)
	if a.Name == "" {
		verr.Add(a, "store name not defined")
	}
	if a.Parent == nil {
		verr.Add(a, "missing storage group parent")
	}
	a.IterateModels(func(model *RelationalModelDefinition) error {
		verr.Merge(model.Validate())
		return nil
	})

	return verr.AsError()
}
Пример #14
0
// Validate tests whether the RelationalModel definition is consistent.
func (a *RelationalModelDefinition) Validate() *dslengine.ValidationErrors {
	fmt.Println("Validating Model")
	verr := new(dslengine.ValidationErrors)
	if a.Name == "" {
		verr.Add(a, "model name not defined")
	}
	if a.Parent == nil {
		verr.Add(a, "missing relational store parent")
	}
	a.IterateFields(func(field *RelationalFieldDefinition) error {
		verr.Merge(field.Validate())
		return nil
	})

	return verr.AsError()
}
Пример #15
0
// ValidateParams checks the action parameters (make sure they have names, members and types).
func (a *ActionDefinition) ValidateParams() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if a.Params == nil {
		return nil
	}
	params, ok := a.Params.Type.(Object)
	if !ok {
		verr.Add(a, `"Params" field of action is not an object`)
	}
	var wcs []string
	for _, r := range a.Routes {
		rwcs := ExtractWildcards(r.FullPath())
		for _, rwc := range rwcs {
			found := false
			for _, wc := range wcs {
				if rwc == wc {
					found = true
					break
				}
			}
			if !found {
				wcs = append(wcs, rwc)
			}
		}
	}
	for n, p := range params {
		if n == "" {
			verr.Add(a, "action has parameter with no name")
		} else if p == nil {
			verr.Add(a, "definition of parameter %s cannot be nil", n)
		} else if p.Type == nil {
			verr.Add(a, "type of parameter %s cannot be nil", n)
		}
		if p.Type.Kind() == ObjectKind {
			verr.Add(a, `parameter %s cannot be an object, only action payloads may be of type object`, n)
		} else if p.Type.Kind() == HashKind {
			verr.Add(a, `parameter %s cannot be a hash, only action payloads may be of type hash`, n)
		}
		ctx := fmt.Sprintf("parameter %s", n)
		verr.Merge(p.Validate(ctx, a))
	}
	for _, resp := range a.Responses {
		verr.Merge(resp.Validate())
	}
	return verr.AsError()
}
Пример #16
0
// Validate tests whether the attribute definition is consistent: required fields exist.
// Since attributes are unaware of their context, additional context information can be provided
// to be used in error messages.
// The parent definition context is automatically added to error messages.
func (a *AttributeDefinition) Validate(ctx string, parent dslengine.Definition) *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if a.Type == nil {
		verr.Add(parent, "attribute type is nil")
		return verr
	}
	if ctx != "" {
		ctx += " - "
	}
	o, isObject := a.Type.(Object)
	for _, v := range a.Validations {
		if r, ok := v.(*dslengine.RequiredValidationDefinition); ok {
			if !isObject {
				verr.Add(parent, `%sonly objects may define a "Required" validation`, ctx)
			}
			for _, n := range r.Names {
				var found bool
				for an := range o {
					if n == an {
						found = true
						break
					}
				}
				if !found {
					verr.Add(parent, `%srequired field "%s" does not exist`, ctx, n)
				}
			}
		}
	}
	if isObject {
		for n, att := range o {
			ctx = fmt.Sprintf("field %s", n)
			verr.Merge(att.Validate(ctx, a))
		}
	} else {
		if a.Type.IsArray() {
			elemType := a.Type.ToArray().ElemType
			verr.Merge(elemType.Validate(ctx, a))
		}
	}

	return verr.AsError()
}
Пример #17
0
// Validate tests whether the resource definition is consistent: action names are valid and each action is
// valid.
func (r *ResourceDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if r.Name == "" {
		verr.Add(r, "Resource name cannot be empty")
	}
	r.validateActions(verr)
	if r.ParentName != "" {
		r.validateParent(verr)
	}
	for _, resp := range r.Responses {
		verr.Merge(resp.Validate())
	}
	if r.Params != nil {
		verr.Merge(r.Params.Validate("resource parameters", r))
	}
	for _, origin := range r.Origins {
		verr.Merge(origin.Validate())
	}
	return verr.AsError()
}
Пример #18
0
// Validate tests whether the attribute definition is consistent: required fields exist.
// Since attributes are unaware of their context, additional context information can be provided
// to be used in error messages.
// The parent definition context is automatically added to error messages.
func (a *AttributeDefinition) Validate(ctx string, parent dslengine.Definition) *dslengine.ValidationErrors {
	if validated[a] {
		return nil
	}
	validated[a] = true
	verr := new(dslengine.ValidationErrors)
	if a.Type == nil {
		verr.Add(parent, "attribute type is nil")
		return verr
	}
	if ctx != "" {
		ctx += " - "
	}
	o := a.Type.ToObject()
	if o != nil {
		for _, n := range a.AllRequired() {
			found := false
			for an := range o {
				if n == an {
					found = true
					break
				}
			}
			if !found {
				verr.Add(parent, `%srequired field "%s" does not exist`, ctx, n)
			}
		}
		for n, att := range o {
			ctx = fmt.Sprintf("field %s", n)
			verr.Merge(att.Validate(ctx, a))
		}
	} else {
		if a.Type.IsArray() {
			elemType := a.Type.ToArray().ElemType
			verr.Merge(elemType.Validate(ctx, a))
		}
	}

	return verr.AsError()
}
Пример #19
0
// Validate tests whether the action definition is consistent: parameters have unique names and it has at least
// one response.
func (a *ActionDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if a.Name == "" {
		verr.Add(a, "Action name cannot be empty")
	}
	if len(a.Routes) == 0 {
		verr.Add(a, "No route defined for action")
	}
	for i, r := range a.Responses {
		for j, r2 := range a.Responses {
			if i != j && r.Status == r2.Status {
				verr.Add(r, "Multiple response definitions with status code %d", r.Status)
			}
		}
		verr.Merge(r.Validate())
	}
	verr.Merge(a.ValidateParams())
	if a.Payload != nil {
		verr.Merge(a.Payload.Validate("action payload", a))
	}
	if a.Parent == nil {
		verr.Add(a, "missing parent resource")
	}
	if a.Params != nil {
		for n, p := range a.Params.Type.ToObject() {
			if p.Type.IsPrimitive() {
				continue
			}
			if p.Type.IsArray() {
				if p.Type.ToArray().ElemType.Type.IsPrimitive() {
					continue
				}
			}
			verr.Add(a, "Param %s has an invalid type, action params must be primitives or arrays of primitives", n)
		}
	}

	return verr.AsError()
}
Пример #20
0
// Validate checks the file server is properly initialized.
func (f *FileServerDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if f.FilePath == "" {
		verr.Add(f, "File server must have a non empty file path")
	}
	if f.RequestPath == "" {
		verr.Add(f, "File server must have a non empty route path")
	}
	if f.Parent == nil {
		verr.Add(f, "missing parent resource")
	}
	matches := WildcardRegex.FindAllString(f.RequestPath, -1)
	if len(matches) == 1 {
		if !strings.HasSuffix(f.RequestPath, matches[0]) {
			verr.Add(f, "invalid request path %s, must end with a wildcard starting with *", f.RequestPath)
		}
	}
	if len(matches) > 2 {
		verr.Add(f, "invalid request path, may only contain one wildcard")
	}

	return verr.AsError()
}
Пример #21
0
// Validate tests whether the API definition is consistent: all resource parent names resolve to
// an actual resource.
func (a *APIDefinition) Validate() *dslengine.ValidationErrors {
	verr := new(dslengine.ValidationErrors)
	if a.BaseParams != nil {
		verr.Merge(a.BaseParams.Validate("base parameters", a))
	}

	a.validateContact(verr)
	a.validateLicense(verr)
	a.validateDocs(verr)

	a.IterateVersions(func(ver *APIVersionDefinition) error {
		var allRoutes []*routeInfo
		a.IterateResources(func(r *ResourceDefinition) error {
			verr.Merge(r.Validate(ver))
			r.IterateActions(func(ac *ActionDefinition) error {
				if ac.Docs != nil && ac.Docs.URL != "" {
					if _, err := url.ParseRequestURI(ac.Docs.URL); err != nil {
						verr.Add(ac, "invalid action docs URL value: %s", err)
					}
				}
				for _, ro := range ac.Routes {
					info := newRouteInfo(ver, r, ac, ro)
					allRoutes = append(allRoutes, info)
					rwcs := ExtractWildcards(ac.Parent.FullPath(ver))
					wcs := ExtractWildcards(ro.Path)
					for _, rwc := range rwcs {
						for _, wc := range wcs {
							if rwc == wc {
								verr.Add(ac, `duplicate wildcard "%s" in resource base path "%s" and action route "%s"`,
									wc, ac.Parent.FullPath(ver), ro.Path)
							}
						}
					}
				}
				return nil
			})
			return nil
		})
		for _, route := range allRoutes {
			for _, other := range allRoutes {
				if route == other {
					continue
				}
				if strings.HasPrefix(route.Key, other.Key) {
					diffs := route.DifferentWildcards(other)
					if len(diffs) > 0 {
						var msg string
						conflicts := make([]string, len(diffs))
						for i, d := range diffs {
							conflicts[i] = fmt.Sprintf(`"%s" from %s and "%s" from %s`, d[0].Name, d[0].Orig.Context(), d[1].Name, d[1].Orig.Context())
						}
						msg = fmt.Sprintf("%s", strings.Join(conflicts, ", "))
						verr.Add(route.Action,
							`route "%s" conflicts with route "%s" of %s action %s. Make sure wildcards at the same positions have the same name. Conflicting wildcards are %s.`,
							route.Route.FullPath(ver),
							other.Route.FullPath(ver),
							other.Resource.Name,
							other.Action.Name,
							msg,
						)
					}
				}
			}
		}
		ver.IterateMediaTypes(func(mt *MediaTypeDefinition) error {
			verr.Merge(mt.Validate())
			return nil
		})
		ver.IterateUserTypes(func(t *UserTypeDefinition) error {
			verr.Merge(t.Validate("", a))
			return nil
		})
		ver.IterateResponses(func(r *ResponseDefinition) error {
			verr.Merge(r.Validate())
			return nil
		})
		for _, dec := range ver.Consumes {
			verr.Merge(dec.Validate())
		}
		for _, enc := range ver.Produces {
			verr.Merge(enc.Validate())
		}
		return nil
	})

	return verr.AsError()
}
Пример #22
0
// Validate tests whether the API definition is consistent: all resource parent names resolve to
// an actual resource.
func (a *APIDefinition) Validate() error {

	// This is a little bit hacky but we need the generated media types DSLs to run first so
	// that their views are defined otherwise we risk running into validation errors where an
	// attribute defined on a non generated media type uses a generated mediatype (i.e.
	// CollectionOf(Foo)) with a specific view that hasn't been set yet.
	// TBD: Maybe GeneratedMediaTypes should not be a separate DSL root.
	for _, mt := range GeneratedMediaTypes {
		dslengine.Execute(mt.DSLFunc, mt)
		mt.DSLFunc = nil // So that it doesn't run again when the generated media types DSL root is executed
	}

	verr := new(dslengine.ValidationErrors)
	if a.Params != nil {
		verr.Merge(a.Params.Validate("base parameters", a))
	}

	a.validateContact(verr)
	a.validateLicense(verr)
	a.validateDocs(verr)
	a.validateOrigins(verr)

	var allRoutes []*routeInfo
	a.IterateResources(func(r *ResourceDefinition) error {
		verr.Merge(r.Validate())
		r.IterateActions(func(ac *ActionDefinition) error {
			if ac.Docs != nil && ac.Docs.URL != "" {
				if _, err := url.ParseRequestURI(ac.Docs.URL); err != nil {
					verr.Add(ac, "invalid action docs URL value: %s", err)
				}
			}
			for _, ro := range ac.Routes {
				if ro.IsAbsolute() {
					continue
				}
				info := newRouteInfo(r, ac, ro)
				allRoutes = append(allRoutes, info)
				rwcs := ExtractWildcards(ac.Parent.FullPath())
				wcs := ExtractWildcards(ro.Path)
				for _, rwc := range rwcs {
					for _, wc := range wcs {
						if rwc == wc {
							verr.Add(ac, `duplicate wildcard "%s" in resource base path "%s" and action route "%s"`,
								wc, ac.Parent.FullPath(), ro.Path)
						}
					}
				}
			}
			return nil
		})
		return nil
	})
	for _, route := range allRoutes {
		for _, other := range allRoutes {
			if route == other {
				continue
			}
			if strings.HasPrefix(route.Key, other.Key) {
				diffs := route.DifferentWildcards(other)
				if len(diffs) > 0 {
					var msg string
					conflicts := make([]string, len(diffs))
					for i, d := range diffs {
						conflicts[i] = fmt.Sprintf(`"%s" from %s and "%s" from %s`, d[0].Name, d[0].Orig.Context(), d[1].Name, d[1].Orig.Context())
					}
					msg = fmt.Sprintf("%s", strings.Join(conflicts, ", "))
					verr.Add(route.Action,
						`route "%s" conflicts with route "%s" of %s action %s. Make sure wildcards at the same positions have the same name. Conflicting wildcards are %s.`,
						route.Route.FullPath(),
						other.Route.FullPath(),
						other.Resource.Name,
						other.Action.Name,
						msg,
					)
				}
			}
		}
	}
	a.IterateMediaTypes(func(mt *MediaTypeDefinition) error {
		verr.Merge(mt.Validate())
		return nil
	})
	a.IterateUserTypes(func(t *UserTypeDefinition) error {
		verr.Merge(t.Validate("", a))
		return nil
	})
	a.IterateResponses(func(r *ResponseDefinition) error {
		verr.Merge(r.Validate())
		return nil
	})
	for _, dec := range a.Consumes {
		verr.Merge(dec.Validate())
	}
	for _, enc := range a.Produces {
		verr.Merge(enc.Validate())
	}

	err := verr.AsError()
	if err == nil {
		// *ValidationErrors(nil) != error(nil)
		return nil
	}
	return err
}