updated GHA

Update to v2 SDK
updated dependencies

vendor/google.golang.org/protobuf/reflect/protodesc/desc.go

@@ -0,0 +1,276 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protodesc provides functionality for converting
+// FileDescriptorProto messages to/from protoreflect.FileDescriptor values.
+//
+// The google.protobuf.FileDescriptorProto is a protobuf message that describes
+// the type information for a .proto file in a form that is easily serializable.
+// The protoreflect.FileDescriptor is a more structured representation of
+// the FileDescriptorProto message where references and remote dependencies
+// can be directly followed.
+package protodesc
+
+import (
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// Resolver is the resolver used by NewFile to resolve dependencies.
+// The enums and messages provided must belong to some parent file,
+// which is also registered.
+//
+// It is implemented by protoregistry.Files.
+type Resolver interface {
+	FindFileByPath(string) (protoreflect.FileDescriptor, error)
+	FindDescriptorByName(protoreflect.FullName) (protoreflect.Descriptor, error)
+}
+
+// FileOptions configures the construction of file descriptors.
+type FileOptions struct {
+	pragma.NoUnkeyedLiterals
+
+	// AllowUnresolvable configures New to permissively allow unresolvable
+	// file, enum, or message dependencies. Unresolved dependencies are replaced
+	// by placeholder equivalents.
+	//
+	// The following dependencies may be left unresolved:
+	//	• Resolving an imported file.
+	//	• Resolving the type for a message field or extension field.
+	//	If the kind of the field is unknown, then a placeholder is used for both
+	//	the Enum and Message accessors on the protoreflect.FieldDescriptor.
+	//	• Resolving an enum value set as the default for an optional enum field.
+	//	If unresolvable, the protoreflect.FieldDescriptor.Default is set to the
+	//	first value in the associated enum (or zero if the also enum dependency
+	//	is also unresolvable). The protoreflect.FieldDescriptor.DefaultEnumValue
+	//	is populated with a placeholder.
+	//	• Resolving the extended message type for an extension field.
+	//	• Resolving the input or output message type for a service method.
+	//
+	// If the unresolved dependency uses a relative name,
+	// then the placeholder will contain an invalid FullName with a "*." prefix,
+	// indicating that the starting prefix of the full name is unknown.
+	AllowUnresolvable bool
+}
+
+// NewFile creates a new protoreflect.FileDescriptor from the provided
+// file descriptor message. See FileOptions.New for more information.
+func NewFile(fd *descriptorpb.FileDescriptorProto, r Resolver) (protoreflect.FileDescriptor, error) {
+	return FileOptions{}.New(fd, r)
+}
+
+// NewFiles creates a new protoregistry.Files from the provided
+// FileDescriptorSet message. See FileOptions.NewFiles for more information.
+func NewFiles(fd *descriptorpb.FileDescriptorSet) (*protoregistry.Files, error) {
+	return FileOptions{}.NewFiles(fd)
+}
+
+// New creates a new protoreflect.FileDescriptor from the provided
+// file descriptor message. The file must represent a valid proto file according
+// to protobuf semantics. The returned descriptor is a deep copy of the input.
+//
+// Any imported files, enum types, or message types referenced in the file are
+// resolved using the provided registry. When looking up an import file path,
+// the path must be unique. The newly created file descriptor is not registered
+// back into the provided file registry.
+func (o FileOptions) New(fd *descriptorpb.FileDescriptorProto, r Resolver) (protoreflect.FileDescriptor, error) {
+	if r == nil {
+		r = (*protoregistry.Files)(nil) // empty resolver
+	}
+
+	// Handle the file descriptor content.
+	f := &filedesc.File{L2: &filedesc.FileL2{}}
+	switch fd.GetSyntax() {
+	case "proto2", "":
+		f.L1.Syntax = protoreflect.Proto2
+	case "proto3":
+		f.L1.Syntax = protoreflect.Proto3
+	default:
+		return nil, errors.New("invalid syntax: %q", fd.GetSyntax())
+	}
+	f.L1.Path = fd.GetName()
+	if f.L1.Path == "" {
+		return nil, errors.New("file path must be populated")
+	}
+	f.L1.Package = protoreflect.FullName(fd.GetPackage())
+	if !f.L1.Package.IsValid() && f.L1.Package != "" {
+		return nil, errors.New("invalid package: %q", f.L1.Package)
+	}
+	if opts := fd.GetOptions(); opts != nil {
+		opts = proto.Clone(opts).(*descriptorpb.FileOptions)
+		f.L2.Options = func() protoreflect.ProtoMessage { return opts }
+	}
+
+	f.L2.Imports = make(filedesc.FileImports, len(fd.GetDependency()))
+	for _, i := range fd.GetPublicDependency() {
+		if !(0 <= i && int(i) < len(f.L2.Imports)) || f.L2.Imports[i].IsPublic {
+			return nil, errors.New("invalid or duplicate public import index: %d", i)
+		}
+		f.L2.Imports[i].IsPublic = true
+	}
+	for _, i := range fd.GetWeakDependency() {
+		if !(0 <= i && int(i) < len(f.L2.Imports)) || f.L2.Imports[i].IsWeak {
+			return nil, errors.New("invalid or duplicate weak import index: %d", i)
+		}
+		f.L2.Imports[i].IsWeak = true
+	}
+	imps := importSet{f.Path(): true}
+	for i, path := range fd.GetDependency() {
+		imp := &f.L2.Imports[i]
+		f, err := r.FindFileByPath(path)
+		if err == protoregistry.NotFound && (o.AllowUnresolvable || imp.IsWeak) {
+			f = filedesc.PlaceholderFile(path)
+		} else if err != nil {
+			return nil, errors.New("could not resolve import %q: %v", path, err)
+		}
+		imp.FileDescriptor = f
+
+		if imps[imp.Path()] {
+			return nil, errors.New("already imported %q", path)
+		}
+		imps[imp.Path()] = true
+	}
+	for i := range fd.GetDependency() {
+		imp := &f.L2.Imports[i]
+		imps.importPublic(imp.Imports())
+	}
+
+	// Handle source locations.
+	f.L2.Locations.File = f
+	for _, loc := range fd.GetSourceCodeInfo().GetLocation() {
+		var l protoreflect.SourceLocation
+		// TODO: Validate that the path points to an actual declaration?
+		l.Path = protoreflect.SourcePath(loc.GetPath())
+		s := loc.GetSpan()
+		switch len(s) {
+		case 3:
+			l.StartLine, l.StartColumn, l.EndLine, l.EndColumn = int(s[0]), int(s[1]), int(s[0]), int(s[2])
+		case 4:
+			l.StartLine, l.StartColumn, l.EndLine, l.EndColumn = int(s[0]), int(s[1]), int(s[2]), int(s[3])
+		default:
+			return nil, errors.New("invalid span: %v", s)
+		}
+		// TODO: Validate that the span information is sensible?
+		// See https://github.com/protocolbuffers/protobuf/issues/6378.
+		if false && (l.EndLine < l.StartLine || l.StartLine < 0 || l.StartColumn < 0 || l.EndColumn < 0 ||
+			(l.StartLine == l.EndLine && l.EndColumn <= l.StartColumn)) {
+			return nil, errors.New("invalid span: %v", s)
+		}
+		l.LeadingDetachedComments = loc.GetLeadingDetachedComments()
+		l.LeadingComments = loc.GetLeadingComments()
+		l.TrailingComments = loc.GetTrailingComments()
+		f.L2.Locations.List = append(f.L2.Locations.List, l)
+	}
+
+	// Step 1: Allocate and derive the names for all declarations.
+	// This copies all fields from the descriptor proto except:
+	//	google.protobuf.FieldDescriptorProto.type_name
+	//	google.protobuf.FieldDescriptorProto.default_value
+	//	google.protobuf.FieldDescriptorProto.oneof_index
+	//	google.protobuf.FieldDescriptorProto.extendee
+	//	google.protobuf.MethodDescriptorProto.input
+	//	google.protobuf.MethodDescriptorProto.output
+	var err error
+	sb := new(strs.Builder)
+	r1 := make(descsByName)
+	if f.L1.Enums.List, err = r1.initEnumDeclarations(fd.GetEnumType(), f, sb); err != nil {
+		return nil, err
+	}
+	if f.L1.Messages.List, err = r1.initMessagesDeclarations(fd.GetMessageType(), f, sb); err != nil {
+		return nil, err
+	}
+	if f.L1.Extensions.List, err = r1.initExtensionDeclarations(fd.GetExtension(), f, sb); err != nil {
+		return nil, err
+	}
+	if f.L1.Services.List, err = r1.initServiceDeclarations(fd.GetService(), f, sb); err != nil {
+		return nil, err
+	}
+
+	// Step 2: Resolve every dependency reference not handled by step 1.
+	r2 := &resolver{local: r1, remote: r, imports: imps, allowUnresolvable: o.AllowUnresolvable}
+	if err := r2.resolveMessageDependencies(f.L1.Messages.List, fd.GetMessageType()); err != nil {
+		return nil, err
+	}
+	if err := r2.resolveExtensionDependencies(f.L1.Extensions.List, fd.GetExtension()); err != nil {
+		return nil, err
+	}
+	if err := r2.resolveServiceDependencies(f.L1.Services.List, fd.GetService()); err != nil {
+		return nil, err
+	}
+
+	// Step 3: Validate every enum, message, and extension declaration.
+	if err := validateEnumDeclarations(f.L1.Enums.List, fd.GetEnumType()); err != nil {
+		return nil, err
+	}
+	if err := validateMessageDeclarations(f.L1.Messages.List, fd.GetMessageType()); err != nil {
+		return nil, err
+	}
+	if err := validateExtensionDeclarations(f.L1.Extensions.List, fd.GetExtension()); err != nil {
+		return nil, err
+	}
+
+	return f, nil
+}
+
+type importSet map[string]bool
+
+func (is importSet) importPublic(imps protoreflect.FileImports) {
+	for i := 0; i < imps.Len(); i++ {
+		if imp := imps.Get(i); imp.IsPublic {
+			is[imp.Path()] = true
+			is.importPublic(imp.Imports())
+		}
+	}
+}
+
+// NewFiles creates a new protoregistry.Files from the provided
+// FileDescriptorSet message. The descriptor set must include only
+// valid files according to protobuf semantics. The returned descriptors
+// are a deep copy of the input.
+func (o FileOptions) NewFiles(fds *descriptorpb.FileDescriptorSet) (*protoregistry.Files, error) {
+	files := make(map[string]*descriptorpb.FileDescriptorProto)
+	for _, fd := range fds.File {
+		if _, ok := files[fd.GetName()]; ok {
+			return nil, errors.New("file appears multiple times: %q", fd.GetName())
+		}
+		files[fd.GetName()] = fd
+	}
+	r := &protoregistry.Files{}
+	for _, fd := range files {
+		if err := o.addFileDeps(r, fd, files); err != nil {
+			return nil, err
+		}
+	}
+	return r, nil
+}
+func (o FileOptions) addFileDeps(r *protoregistry.Files, fd *descriptorpb.FileDescriptorProto, files map[string]*descriptorpb.FileDescriptorProto) error {
+	// Set the entry to nil while descending into a file's dependencies to detect cycles.
+	files[fd.GetName()] = nil
+	for _, dep := range fd.Dependency {
+		depfd, ok := files[dep]
+		if depfd == nil {
+			if ok {
+				return errors.New("import cycle in file: %q", dep)
+			}
+			continue
+		}
+		if err := o.addFileDeps(r, depfd, files); err != nil {
+			return err
+		}
+	}
+	// Delete the entry once dependencies are processed.
+	delete(files, fd.GetName())
+	f, err := o.New(fd, r)
+	if err != nil {
+		return err
+	}
+	return r.RegisterFile(f)
+}

vendor/google.golang.org/protobuf/reflect/protodesc/desc_init.go

@@ -0,0 +1,248 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protodesc
+
+import (
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+type descsByName map[protoreflect.FullName]protoreflect.Descriptor
+
+func (r descsByName) initEnumDeclarations(eds []*descriptorpb.EnumDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (es []filedesc.Enum, err error) {
+	es = make([]filedesc.Enum, len(eds)) // allocate up-front to ensure stable pointers
+	for i, ed := range eds {
+		e := &es[i]
+		e.L2 = new(filedesc.EnumL2)
+		if e.L0, err = r.makeBase(e, parent, ed.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		if opts := ed.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.EnumOptions)
+			e.L2.Options = func() protoreflect.ProtoMessage { return opts }
+		}
+		for _, s := range ed.GetReservedName() {
+			e.L2.ReservedNames.List = append(e.L2.ReservedNames.List, protoreflect.Name(s))
+		}
+		for _, rr := range ed.GetReservedRange() {
+			e.L2.ReservedRanges.List = append(e.L2.ReservedRanges.List, [2]protoreflect.EnumNumber{
+				protoreflect.EnumNumber(rr.GetStart()),
+				protoreflect.EnumNumber(rr.GetEnd()),
+			})
+		}
+		if e.L2.Values.List, err = r.initEnumValuesFromDescriptorProto(ed.GetValue(), e, sb); err != nil {
+			return nil, err
+		}
+	}
+	return es, nil
+}
+
+func (r descsByName) initEnumValuesFromDescriptorProto(vds []*descriptorpb.EnumValueDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (vs []filedesc.EnumValue, err error) {
+	vs = make([]filedesc.EnumValue, len(vds)) // allocate up-front to ensure stable pointers
+	for i, vd := range vds {
+		v := &vs[i]
+		if v.L0, err = r.makeBase(v, parent, vd.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		if opts := vd.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.EnumValueOptions)
+			v.L1.Options = func() protoreflect.ProtoMessage { return opts }
+		}
+		v.L1.Number = protoreflect.EnumNumber(vd.GetNumber())
+	}
+	return vs, nil
+}
+
+func (r descsByName) initMessagesDeclarations(mds []*descriptorpb.DescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (ms []filedesc.Message, err error) {
+	ms = make([]filedesc.Message, len(mds)) // allocate up-front to ensure stable pointers
+	for i, md := range mds {
+		m := &ms[i]
+		m.L2 = new(filedesc.MessageL2)
+		if m.L0, err = r.makeBase(m, parent, md.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		if opts := md.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.MessageOptions)
+			m.L2.Options = func() protoreflect.ProtoMessage { return opts }
+			m.L1.IsMapEntry = opts.GetMapEntry()
+			m.L1.IsMessageSet = opts.GetMessageSetWireFormat()
+		}
+		for _, s := range md.GetReservedName() {
+			m.L2.ReservedNames.List = append(m.L2.ReservedNames.List, protoreflect.Name(s))
+		}
+		for _, rr := range md.GetReservedRange() {
+			m.L2.ReservedRanges.List = append(m.L2.ReservedRanges.List, [2]protoreflect.FieldNumber{
+				protoreflect.FieldNumber(rr.GetStart()),
+				protoreflect.FieldNumber(rr.GetEnd()),
+			})
+		}
+		for _, xr := range md.GetExtensionRange() {
+			m.L2.ExtensionRanges.List = append(m.L2.ExtensionRanges.List, [2]protoreflect.FieldNumber{
+				protoreflect.FieldNumber(xr.GetStart()),
+				protoreflect.FieldNumber(xr.GetEnd()),
+			})
+			var optsFunc func() protoreflect.ProtoMessage
+			if opts := xr.GetOptions(); opts != nil {
+				opts = proto.Clone(opts).(*descriptorpb.ExtensionRangeOptions)
+				optsFunc = func() protoreflect.ProtoMessage { return opts }
+			}
+			m.L2.ExtensionRangeOptions = append(m.L2.ExtensionRangeOptions, optsFunc)
+		}
+		if m.L2.Fields.List, err = r.initFieldsFromDescriptorProto(md.GetField(), m, sb); err != nil {
+			return nil, err
+		}
+		if m.L2.Oneofs.List, err = r.initOneofsFromDescriptorProto(md.GetOneofDecl(), m, sb); err != nil {
+			return nil, err
+		}
+		if m.L1.Enums.List, err = r.initEnumDeclarations(md.GetEnumType(), m, sb); err != nil {
+			return nil, err
+		}
+		if m.L1.Messages.List, err = r.initMessagesDeclarations(md.GetNestedType(), m, sb); err != nil {
+			return nil, err
+		}
+		if m.L1.Extensions.List, err = r.initExtensionDeclarations(md.GetExtension(), m, sb); err != nil {
+			return nil, err
+		}
+	}
+	return ms, nil
+}
+
+func (r descsByName) initFieldsFromDescriptorProto(fds []*descriptorpb.FieldDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (fs []filedesc.Field, err error) {
+	fs = make([]filedesc.Field, len(fds)) // allocate up-front to ensure stable pointers
+	for i, fd := range fds {
+		f := &fs[i]
+		if f.L0, err = r.makeBase(f, parent, fd.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		f.L1.IsProto3Optional = fd.GetProto3Optional()
+		if opts := fd.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.FieldOptions)
+			f.L1.Options = func() protoreflect.ProtoMessage { return opts }
+			f.L1.IsWeak = opts.GetWeak()
+			f.L1.HasPacked = opts.Packed != nil
+			f.L1.IsPacked = opts.GetPacked()
+		}
+		f.L1.Number = protoreflect.FieldNumber(fd.GetNumber())
+		f.L1.Cardinality = protoreflect.Cardinality(fd.GetLabel())
+		if fd.Type != nil {
+			f.L1.Kind = protoreflect.Kind(fd.GetType())
+		}
+		if fd.JsonName != nil {
+			f.L1.StringName.InitJSON(fd.GetJsonName())
+		}
+	}
+	return fs, nil
+}
+
+func (r descsByName) initOneofsFromDescriptorProto(ods []*descriptorpb.OneofDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (os []filedesc.Oneof, err error) {
+	os = make([]filedesc.Oneof, len(ods)) // allocate up-front to ensure stable pointers
+	for i, od := range ods {
+		o := &os[i]
+		if o.L0, err = r.makeBase(o, parent, od.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		if opts := od.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.OneofOptions)
+			o.L1.Options = func() protoreflect.ProtoMessage { return opts }
+		}
+	}
+	return os, nil
+}
+
+func (r descsByName) initExtensionDeclarations(xds []*descriptorpb.FieldDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (xs []filedesc.Extension, err error) {
+	xs = make([]filedesc.Extension, len(xds)) // allocate up-front to ensure stable pointers
+	for i, xd := range xds {
+		x := &xs[i]
+		x.L2 = new(filedesc.ExtensionL2)
+		if x.L0, err = r.makeBase(x, parent, xd.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		if opts := xd.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.FieldOptions)
+			x.L2.Options = func() protoreflect.ProtoMessage { return opts }
+			x.L2.IsPacked = opts.GetPacked()
+		}
+		x.L1.Number = protoreflect.FieldNumber(xd.GetNumber())
+		x.L1.Cardinality = protoreflect.Cardinality(xd.GetLabel())
+		if xd.Type != nil {
+			x.L1.Kind = protoreflect.Kind(xd.GetType())
+		}
+		if xd.JsonName != nil {
+			x.L2.StringName.InitJSON(xd.GetJsonName())
+		}
+	}
+	return xs, nil
+}
+
+func (r descsByName) initServiceDeclarations(sds []*descriptorpb.ServiceDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (ss []filedesc.Service, err error) {
+	ss = make([]filedesc.Service, len(sds)) // allocate up-front to ensure stable pointers
+	for i, sd := range sds {
+		s := &ss[i]
+		s.L2 = new(filedesc.ServiceL2)
+		if s.L0, err = r.makeBase(s, parent, sd.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		if opts := sd.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.ServiceOptions)
+			s.L2.Options = func() protoreflect.ProtoMessage { return opts }
+		}
+		if s.L2.Methods.List, err = r.initMethodsFromDescriptorProto(sd.GetMethod(), s, sb); err != nil {
+			return nil, err
+		}
+	}
+	return ss, nil
+}
+
+func (r descsByName) initMethodsFromDescriptorProto(mds []*descriptorpb.MethodDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (ms []filedesc.Method, err error) {
+	ms = make([]filedesc.Method, len(mds)) // allocate up-front to ensure stable pointers
+	for i, md := range mds {
+		m := &ms[i]
+		if m.L0, err = r.makeBase(m, parent, md.GetName(), i, sb); err != nil {
+			return nil, err
+		}
+		if opts := md.GetOptions(); opts != nil {
+			opts = proto.Clone(opts).(*descriptorpb.MethodOptions)
+			m.L1.Options = func() protoreflect.ProtoMessage { return opts }
+		}
+		m.L1.IsStreamingClient = md.GetClientStreaming()
+		m.L1.IsStreamingServer = md.GetServerStreaming()
+	}
+	return ms, nil
+}
+
+func (r descsByName) makeBase(child, parent protoreflect.Descriptor, name string, idx int, sb *strs.Builder) (filedesc.BaseL0, error) {
+	if !protoreflect.Name(name).IsValid() {
+		return filedesc.BaseL0{}, errors.New("descriptor %q has an invalid nested name: %q", parent.FullName(), name)
+	}
+
+	// Derive the full name of the child.
+	// Note that enum values are a sibling to the enum parent in the namespace.
+	var fullName protoreflect.FullName
+	if _, ok := parent.(protoreflect.EnumDescriptor); ok {
+		fullName = sb.AppendFullName(parent.FullName().Parent(), protoreflect.Name(name))
+	} else {
+		fullName = sb.AppendFullName(parent.FullName(), protoreflect.Name(name))
+	}
+	if _, ok := r[fullName]; ok {
+		return filedesc.BaseL0{}, errors.New("descriptor %q already declared", fullName)
+	}
+	r[fullName] = child
+
+	// TODO: Verify that the full name does not already exist in the resolver?
+	// This is not as critical since most usages of NewFile will register
+	// the created file back into the registry, which will perform this check.
+
+	return filedesc.BaseL0{
+		FullName:   fullName,
+		ParentFile: parent.ParentFile().(*filedesc.File),
+		Parent:     parent,
+		Index:      idx,
+	}, nil
+}

vendor/google.golang.org/protobuf/reflect/protodesc/desc_resolve.go

@@ -0,0 +1,286 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protodesc
+
+import (
+	"google.golang.org/protobuf/internal/encoding/defval"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// resolver is a wrapper around a local registry of declarations within the file
+// and the remote resolver. The remote resolver is restricted to only return
+// descriptors that have been imported.
+type resolver struct {
+	local   descsByName
+	remote  Resolver
+	imports importSet
+
+	allowUnresolvable bool
+}
+
+func (r *resolver) resolveMessageDependencies(ms []filedesc.Message, mds []*descriptorpb.DescriptorProto) (err error) {
+	for i, md := range mds {
+		m := &ms[i]
+		for j, fd := range md.GetField() {
+			f := &m.L2.Fields.List[j]
+			if f.L1.Cardinality == protoreflect.Required {
+				m.L2.RequiredNumbers.List = append(m.L2.RequiredNumbers.List, f.L1.Number)
+			}
+			if fd.OneofIndex != nil {
+				k := int(fd.GetOneofIndex())
+				if !(0 <= k && k < len(md.GetOneofDecl())) {
+					return errors.New("message field %q has an invalid oneof index: %d", f.FullName(), k)
+				}
+				o := &m.L2.Oneofs.List[k]
+				f.L1.ContainingOneof = o
+				o.L1.Fields.List = append(o.L1.Fields.List, f)
+			}
+
+			if f.L1.Kind, f.L1.Enum, f.L1.Message, err = r.findTarget(f.Kind(), f.Parent().FullName(), partialName(fd.GetTypeName()), f.IsWeak()); err != nil {
+				return errors.New("message field %q cannot resolve type: %v", f.FullName(), err)
+			}
+			if fd.DefaultValue != nil {
+				v, ev, err := unmarshalDefault(fd.GetDefaultValue(), f, r.allowUnresolvable)
+				if err != nil {
+					return errors.New("message field %q has invalid default: %v", f.FullName(), err)
+				}
+				f.L1.Default = filedesc.DefaultValue(v, ev)
+			}
+		}
+
+		if err := r.resolveMessageDependencies(m.L1.Messages.List, md.GetNestedType()); err != nil {
+			return err
+		}
+		if err := r.resolveExtensionDependencies(m.L1.Extensions.List, md.GetExtension()); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (r *resolver) resolveExtensionDependencies(xs []filedesc.Extension, xds []*descriptorpb.FieldDescriptorProto) (err error) {
+	for i, xd := range xds {
+		x := &xs[i]
+		if x.L1.Extendee, err = r.findMessageDescriptor(x.Parent().FullName(), partialName(xd.GetExtendee()), false); err != nil {
+			return errors.New("extension field %q cannot resolve extendee: %v", x.FullName(), err)
+		}
+		if x.L1.Kind, x.L2.Enum, x.L2.Message, err = r.findTarget(x.Kind(), x.Parent().FullName(), partialName(xd.GetTypeName()), false); err != nil {
+			return errors.New("extension field %q cannot resolve type: %v", x.FullName(), err)
+		}
+		if xd.DefaultValue != nil {
+			v, ev, err := unmarshalDefault(xd.GetDefaultValue(), x, r.allowUnresolvable)
+			if err != nil {
+				return errors.New("extension field %q has invalid default: %v", x.FullName(), err)
+			}
+			x.L2.Default = filedesc.DefaultValue(v, ev)
+		}
+	}
+	return nil
+}
+
+func (r *resolver) resolveServiceDependencies(ss []filedesc.Service, sds []*descriptorpb.ServiceDescriptorProto) (err error) {
+	for i, sd := range sds {
+		s := &ss[i]
+		for j, md := range sd.GetMethod() {
+			m := &s.L2.Methods.List[j]
+			m.L1.Input, err = r.findMessageDescriptor(m.Parent().FullName(), partialName(md.GetInputType()), false)
+			if err != nil {
+				return errors.New("service method %q cannot resolve input: %v", m.FullName(), err)
+			}
+			m.L1.Output, err = r.findMessageDescriptor(s.FullName(), partialName(md.GetOutputType()), false)
+			if err != nil {
+				return errors.New("service method %q cannot resolve output: %v", m.FullName(), err)
+			}
+		}
+	}
+	return nil
+}
+
+// findTarget finds an enum or message descriptor if k is an enum, message,
+// group, or unknown. If unknown, and the name could be resolved, the kind
+// returned kind is set based on the type of the resolved descriptor.
+func (r *resolver) findTarget(k protoreflect.Kind, scope protoreflect.FullName, ref partialName, isWeak bool) (protoreflect.Kind, protoreflect.EnumDescriptor, protoreflect.MessageDescriptor, error) {
+	switch k {
+	case protoreflect.EnumKind:
+		ed, err := r.findEnumDescriptor(scope, ref, isWeak)
+		if err != nil {
+			return 0, nil, nil, err
+		}
+		return k, ed, nil, nil
+	case protoreflect.MessageKind, protoreflect.GroupKind:
+		md, err := r.findMessageDescriptor(scope, ref, isWeak)
+		if err != nil {
+			return 0, nil, nil, err
+		}
+		return k, nil, md, nil
+	case 0:
+		// Handle unspecified kinds (possible with parsers that operate
+		// on a per-file basis without knowledge of dependencies).
+		d, err := r.findDescriptor(scope, ref)
+		if err == protoregistry.NotFound && (r.allowUnresolvable || isWeak) {
+			return k, filedesc.PlaceholderEnum(ref.FullName()), filedesc.PlaceholderMessage(ref.FullName()), nil
+		} else if err == protoregistry.NotFound {
+			return 0, nil, nil, errors.New("%q not found", ref.FullName())
+		} else if err != nil {
+			return 0, nil, nil, err
+		}
+		switch d := d.(type) {
+		case protoreflect.EnumDescriptor:
+			return protoreflect.EnumKind, d, nil, nil
+		case protoreflect.MessageDescriptor:
+			return protoreflect.MessageKind, nil, d, nil
+		default:
+			return 0, nil, nil, errors.New("unknown kind")
+		}
+	default:
+		if ref != "" {
+			return 0, nil, nil, errors.New("target name cannot be specified for %v", k)
+		}
+		if !k.IsValid() {
+			return 0, nil, nil, errors.New("invalid kind: %d", k)
+		}
+		return k, nil, nil, nil
+	}
+}
+
+// findDescriptor finds the descriptor by name,
+// which may be a relative name within some scope.
+//
+// Suppose the scope was "fizz.buzz" and the reference was "Foo.Bar",
+// then the following full names are searched:
+//	* fizz.buzz.Foo.Bar
+//	* fizz.Foo.Bar
+//	* Foo.Bar
+func (r *resolver) findDescriptor(scope protoreflect.FullName, ref partialName) (protoreflect.Descriptor, error) {
+	if !ref.IsValid() {
+		return nil, errors.New("invalid name reference: %q", ref)
+	}
+	if ref.IsFull() {
+		scope, ref = "", ref[1:]
+	}
+	var foundButNotImported protoreflect.Descriptor
+	for {
+		// Derive the full name to search.
+		s := protoreflect.FullName(ref)
+		if scope != "" {
+			s = scope + "." + s
+		}
+
+		// Check the current file for the descriptor.
+		if d, ok := r.local[s]; ok {
+			return d, nil
+		}
+
+		// Check the remote registry for the descriptor.
+		d, err := r.remote.FindDescriptorByName(s)
+		if err == nil {
+			// Only allow descriptors covered by one of the imports.
+			if r.imports[d.ParentFile().Path()] {
+				return d, nil
+			}
+			foundButNotImported = d
+		} else if err != protoregistry.NotFound {
+			return nil, errors.Wrap(err, "%q", s)
+		}
+
+		// Continue on at a higher level of scoping.
+		if scope == "" {
+			if d := foundButNotImported; d != nil {
+				return nil, errors.New("resolved %q, but %q is not imported", d.FullName(), d.ParentFile().Path())
+			}
+			return nil, protoregistry.NotFound
+		}
+		scope = scope.Parent()
+	}
+}
+
+func (r *resolver) findEnumDescriptor(scope protoreflect.FullName, ref partialName, isWeak bool) (protoreflect.EnumDescriptor, error) {
+	d, err := r.findDescriptor(scope, ref)
+	if err == protoregistry.NotFound && (r.allowUnresolvable || isWeak) {
+		return filedesc.PlaceholderEnum(ref.FullName()), nil
+	} else if err == protoregistry.NotFound {
+		return nil, errors.New("%q not found", ref.FullName())
+	} else if err != nil {
+		return nil, err
+	}
+	ed, ok := d.(protoreflect.EnumDescriptor)
+	if !ok {
+		return nil, errors.New("resolved %q, but it is not an enum", d.FullName())
+	}
+	return ed, nil
+}
+
+func (r *resolver) findMessageDescriptor(scope protoreflect.FullName, ref partialName, isWeak bool) (protoreflect.MessageDescriptor, error) {
+	d, err := r.findDescriptor(scope, ref)
+	if err == protoregistry.NotFound && (r.allowUnresolvable || isWeak) {
+		return filedesc.PlaceholderMessage(ref.FullName()), nil
+	} else if err == protoregistry.NotFound {
+		return nil, errors.New("%q not found", ref.FullName())
+	} else if err != nil {
+		return nil, err
+	}
+	md, ok := d.(protoreflect.MessageDescriptor)
+	if !ok {
+		return nil, errors.New("resolved %q, but it is not an message", d.FullName())
+	}
+	return md, nil
+}
+
+// partialName is the partial name. A leading dot means that the name is full,
+// otherwise the name is relative to some current scope.
+// See google.protobuf.FieldDescriptorProto.type_name.
+type partialName string
+
+func (s partialName) IsFull() bool {
+	return len(s) > 0 && s[0] == '.'
+}
+
+func (s partialName) IsValid() bool {
+	if s.IsFull() {
+		return protoreflect.FullName(s[1:]).IsValid()
+	}
+	return protoreflect.FullName(s).IsValid()
+}
+
+const unknownPrefix = "*."
+
+// FullName converts the partial name to a full name on a best-effort basis.
+// If relative, it creates an invalid full name, using a "*." prefix
+// to indicate that the start of the full name is unknown.
+func (s partialName) FullName() protoreflect.FullName {
+	if s.IsFull() {
+		return protoreflect.FullName(s[1:])
+	}
+	return protoreflect.FullName(unknownPrefix + s)
+}
+
+func unmarshalDefault(s string, fd protoreflect.FieldDescriptor, allowUnresolvable bool) (protoreflect.Value, protoreflect.EnumValueDescriptor, error) {
+	var evs protoreflect.EnumValueDescriptors
+	if fd.Enum() != nil {
+		evs = fd.Enum().Values()
+	}
+	v, ev, err := defval.Unmarshal(s, fd.Kind(), evs, defval.Descriptor)
+	if err != nil && allowUnresolvable && evs != nil && protoreflect.Name(s).IsValid() {
+		v = protoreflect.ValueOfEnum(0)
+		if evs.Len() > 0 {
+			v = protoreflect.ValueOfEnum(evs.Get(0).Number())
+		}
+		ev = filedesc.PlaceholderEnumValue(fd.Enum().FullName().Parent().Append(protoreflect.Name(s)))
+	} else if err != nil {
+		return v, ev, err
+	}
+	if fd.Syntax() == protoreflect.Proto3 {
+		return v, ev, errors.New("cannot be specified under proto3 semantics")
+	}
+	if fd.Kind() == protoreflect.MessageKind || fd.Kind() == protoreflect.GroupKind || fd.Cardinality() == protoreflect.Repeated {
+		return v, ev, errors.New("cannot be specified on composite types")
+	}
+	return v, ev, nil
+}

vendor/google.golang.org/protobuf/reflect/protodesc/desc_validate.go

@@ -0,0 +1,374 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protodesc
+
+import (
+	"strings"
+	"unicode"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/internal/genid"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/reflect/protoreflect"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+func validateEnumDeclarations(es []filedesc.Enum, eds []*descriptorpb.EnumDescriptorProto) error {
+	for i, ed := range eds {
+		e := &es[i]
+		if err := e.L2.ReservedNames.CheckValid(); err != nil {
+			return errors.New("enum %q reserved names has %v", e.FullName(), err)
+		}
+		if err := e.L2.ReservedRanges.CheckValid(); err != nil {
+			return errors.New("enum %q reserved ranges has %v", e.FullName(), err)
+		}
+		if len(ed.GetValue()) == 0 {
+			return errors.New("enum %q must contain at least one value declaration", e.FullName())
+		}
+		allowAlias := ed.GetOptions().GetAllowAlias()
+		foundAlias := false
+		for i := 0; i < e.Values().Len(); i++ {
+			v1 := e.Values().Get(i)
+			if v2 := e.Values().ByNumber(v1.Number()); v1 != v2 {
+				foundAlias = true
+				if !allowAlias {
+					return errors.New("enum %q has conflicting non-aliased values on number %d: %q with %q", e.FullName(), v1.Number(), v1.Name(), v2.Name())
+				}
+			}
+		}
+		if allowAlias && !foundAlias {
+			return errors.New("enum %q allows aliases, but none were found", e.FullName())
+		}
+		if e.Syntax() == protoreflect.Proto3 {
+			if v := e.Values().Get(0); v.Number() != 0 {
+				return errors.New("enum %q using proto3 semantics must have zero number for the first value", v.FullName())
+			}
+			// Verify that value names in proto3 do not conflict if the
+			// case-insensitive prefix is removed.
+			// See protoc v3.8.0: src/google/protobuf/descriptor.cc:4991-5055
+			names := map[string]protoreflect.EnumValueDescriptor{}
+			prefix := strings.Replace(strings.ToLower(string(e.Name())), "_", "", -1)
+			for i := 0; i < e.Values().Len(); i++ {
+				v1 := e.Values().Get(i)
+				s := strs.EnumValueName(strs.TrimEnumPrefix(string(v1.Name()), prefix))
+				if v2, ok := names[s]; ok && v1.Number() != v2.Number() {
+					return errors.New("enum %q using proto3 semantics has conflict: %q with %q", e.FullName(), v1.Name(), v2.Name())
+				}
+				names[s] = v1
+			}
+		}
+
+		for j, vd := range ed.GetValue() {
+			v := &e.L2.Values.List[j]
+			if vd.Number == nil {
+				return errors.New("enum value %q must have a specified number", v.FullName())
+			}
+			if e.L2.ReservedNames.Has(v.Name()) {
+				return errors.New("enum value %q must not use reserved name", v.FullName())
+			}
+			if e.L2.ReservedRanges.Has(v.Number()) {
+				return errors.New("enum value %q must not use reserved number %d", v.FullName(), v.Number())
+			}
+		}
+	}
+	return nil
+}
+
+func validateMessageDeclarations(ms []filedesc.Message, mds []*descriptorpb.DescriptorProto) error {
+	for i, md := range mds {
+		m := &ms[i]
+
+		// Handle the message descriptor itself.
+		isMessageSet := md.GetOptions().GetMessageSetWireFormat()
+		if err := m.L2.ReservedNames.CheckValid(); err != nil {
+			return errors.New("message %q reserved names has %v", m.FullName(), err)
+		}
+		if err := m.L2.ReservedRanges.CheckValid(isMessageSet); err != nil {
+			return errors.New("message %q reserved ranges has %v", m.FullName(), err)
+		}
+		if err := m.L2.ExtensionRanges.CheckValid(isMessageSet); err != nil {
+			return errors.New("message %q extension ranges has %v", m.FullName(), err)
+		}
+		if err := (*filedesc.FieldRanges).CheckOverlap(&m.L2.ReservedRanges, &m.L2.ExtensionRanges); err != nil {
+			return errors.New("message %q reserved and extension ranges has %v", m.FullName(), err)
+		}
+		for i := 0; i < m.Fields().Len(); i++ {
+			f1 := m.Fields().Get(i)
+			if f2 := m.Fields().ByNumber(f1.Number()); f1 != f2 {
+				return errors.New("message %q has conflicting fields: %q with %q", m.FullName(), f1.Name(), f2.Name())
+			}
+		}
+		if isMessageSet && !flags.ProtoLegacy {
+			return errors.New("message %q is a MessageSet, which is a legacy proto1 feature that is no longer supported", m.FullName())
+		}
+		if isMessageSet && (m.Syntax() != protoreflect.Proto2 || m.Fields().Len() > 0 || m.ExtensionRanges().Len() == 0) {
+			return errors.New("message %q is an invalid proto1 MessageSet", m.FullName())
+		}
+		if m.Syntax() == protoreflect.Proto3 {
+			if m.ExtensionRanges().Len() > 0 {
+				return errors.New("message %q using proto3 semantics cannot have extension ranges", m.FullName())
+			}
+			// Verify that field names in proto3 do not conflict if lowercased
+			// with all underscores removed.
+			// See protoc v3.8.0: src/google/protobuf/descriptor.cc:5830-5847
+			names := map[string]protoreflect.FieldDescriptor{}
+			for i := 0; i < m.Fields().Len(); i++ {
+				f1 := m.Fields().Get(i)
+				s := strings.Replace(strings.ToLower(string(f1.Name())), "_", "", -1)
+				if f2, ok := names[s]; ok {
+					return errors.New("message %q using proto3 semantics has conflict: %q with %q", m.FullName(), f1.Name(), f2.Name())
+				}
+				names[s] = f1
+			}
+		}
+
+		for j, fd := range md.GetField() {
+			f := &m.L2.Fields.List[j]
+			if m.L2.ReservedNames.Has(f.Name()) {
+				return errors.New("message field %q must not use reserved name", f.FullName())
+			}
+			if !f.Number().IsValid() {
+				return errors.New("message field %q has an invalid number: %d", f.FullName(), f.Number())
+			}
+			if !f.Cardinality().IsValid() {
+				return errors.New("message field %q has an invalid cardinality: %d", f.FullName(), f.Cardinality())
+			}
+			if m.L2.ReservedRanges.Has(f.Number()) {
+				return errors.New("message field %q must not use reserved number %d", f.FullName(), f.Number())
+			}
+			if m.L2.ExtensionRanges.Has(f.Number()) {
+				return errors.New("message field %q with number %d in extension range", f.FullName(), f.Number())
+			}
+			if fd.Extendee != nil {
+				return errors.New("message field %q may not have extendee: %q", f.FullName(), fd.GetExtendee())
+			}
+			if f.L1.IsProto3Optional {
+				if f.Syntax() != protoreflect.Proto3 {
+					return errors.New("message field %q under proto3 optional semantics must be specified in the proto3 syntax", f.FullName())
+				}
+				if f.Cardinality() != protoreflect.Optional {
+					return errors.New("message field %q under proto3 optional semantics must have optional cardinality", f.FullName())
+				}
+				if f.ContainingOneof() != nil && f.ContainingOneof().Fields().Len() != 1 {
+					return errors.New("message field %q under proto3 optional semantics must be within a single element oneof", f.FullName())
+				}
+			}
+			if f.IsWeak() && !flags.ProtoLegacy {
+				return errors.New("message field %q is a weak field, which is a legacy proto1 feature that is no longer supported", f.FullName())
+			}
+			if f.IsWeak() && (f.Syntax() != protoreflect.Proto2 || !isOptionalMessage(f) || f.ContainingOneof() != nil) {
+				return errors.New("message field %q may only be weak for an optional message", f.FullName())
+			}
+			if f.IsPacked() && !isPackable(f) {
+				return errors.New("message field %q is not packable", f.FullName())
+			}
+			if err := checkValidGroup(f); err != nil {
+				return errors.New("message field %q is an invalid group: %v", f.FullName(), err)
+			}
+			if err := checkValidMap(f); err != nil {
+				return errors.New("message field %q is an invalid map: %v", f.FullName(), err)
+			}
+			if f.Syntax() == protoreflect.Proto3 {
+				if f.Cardinality() == protoreflect.Required {
+					return errors.New("message field %q using proto3 semantics cannot be required", f.FullName())
+				}
+				if f.Enum() != nil && !f.Enum().IsPlaceholder() && f.Enum().Syntax() != protoreflect.Proto3 {
+					return errors.New("message field %q using proto3 semantics may only depend on a proto3 enum", f.FullName())
+				}
+			}
+		}
+		seenSynthetic := false // synthetic oneofs for proto3 optional must come after real oneofs
+		for j := range md.GetOneofDecl() {
+			o := &m.L2.Oneofs.List[j]
+			if o.Fields().Len() == 0 {
+				return errors.New("message oneof %q must contain at least one field declaration", o.FullName())
+			}
+			if n := o.Fields().Len(); n-1 != (o.Fields().Get(n-1).Index() - o.Fields().Get(0).Index()) {
+				return errors.New("message oneof %q must have consecutively declared fields", o.FullName())
+			}
+
+			if o.IsSynthetic() {
+				seenSynthetic = true
+				continue
+			}
+			if !o.IsSynthetic() && seenSynthetic {
+				return errors.New("message oneof %q must be declared before synthetic oneofs", o.FullName())
+			}
+
+			for i := 0; i < o.Fields().Len(); i++ {
+				f := o.Fields().Get(i)
+				if f.Cardinality() != protoreflect.Optional {
+					return errors.New("message field %q belongs in a oneof and must be optional", f.FullName())
+				}
+				if f.IsWeak() {
+					return errors.New("message field %q belongs in a oneof and must not be a weak reference", f.FullName())
+				}
+			}
+		}
+
+		if err := validateEnumDeclarations(m.L1.Enums.List, md.GetEnumType()); err != nil {
+			return err
+		}
+		if err := validateMessageDeclarations(m.L1.Messages.List, md.GetNestedType()); err != nil {
+			return err
+		}
+		if err := validateExtensionDeclarations(m.L1.Extensions.List, md.GetExtension()); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func validateExtensionDeclarations(xs []filedesc.Extension, xds []*descriptorpb.FieldDescriptorProto) error {
+	for i, xd := range xds {
+		x := &xs[i]
+		// NOTE: Avoid using the IsValid method since extensions to MessageSet
+		// may have a field number higher than normal. This check only verifies
+		// that the number is not negative or reserved. We check again later
+		// if we know that the extendee is definitely not a MessageSet.
+		if n := x.Number(); n < 0 || (protowire.FirstReservedNumber <= n && n <= protowire.LastReservedNumber) {
+			return errors.New("extension field %q has an invalid number: %d", x.FullName(), x.Number())
+		}
+		if !x.Cardinality().IsValid() || x.Cardinality() == protoreflect.Required {
+			return errors.New("extension field %q has an invalid cardinality: %d", x.FullName(), x.Cardinality())
+		}
+		if xd.JsonName != nil {
+			// A bug in older versions of protoc would always populate the
+			// "json_name" option for extensions when it is meaningless.
+			// When it did so, it would always use the camel-cased field name.
+			if xd.GetJsonName() != strs.JSONCamelCase(string(x.Name())) {
+				return errors.New("extension field %q may not have an explicitly set JSON name: %q", x.FullName(), xd.GetJsonName())
+			}
+		}
+		if xd.OneofIndex != nil {
+			return errors.New("extension field %q may not be part of a oneof", x.FullName())
+		}
+		if md := x.ContainingMessage(); !md.IsPlaceholder() {
+			if !md.ExtensionRanges().Has(x.Number()) {
+				return errors.New("extension field %q extends %q with non-extension field number: %d", x.FullName(), md.FullName(), x.Number())
+			}
+			isMessageSet := md.Options().(*descriptorpb.MessageOptions).GetMessageSetWireFormat()
+			if isMessageSet && !isOptionalMessage(x) {
+				return errors.New("extension field %q extends MessageSet and must be an optional message", x.FullName())
+			}
+			if !isMessageSet && !x.Number().IsValid() {
+				return errors.New("extension field %q has an invalid number: %d", x.FullName(), x.Number())
+			}
+		}
+		if xd.GetOptions().GetWeak() {
+			return errors.New("extension field %q cannot be a weak reference", x.FullName())
+		}
+		if x.IsPacked() && !isPackable(x) {
+			return errors.New("extension field %q is not packable", x.FullName())
+		}
+		if err := checkValidGroup(x); err != nil {
+			return errors.New("extension field %q is an invalid group: %v", x.FullName(), err)
+		}
+		if md := x.Message(); md != nil && md.IsMapEntry() {
+			return errors.New("extension field %q cannot be a map entry", x.FullName())
+		}
+		if x.Syntax() == protoreflect.Proto3 {
+			switch x.ContainingMessage().FullName() {
+			case (*descriptorpb.FileOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.EnumOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.EnumValueOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.MessageOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.FieldOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.OneofOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.ExtensionRangeOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.ServiceOptions)(nil).ProtoReflect().Descriptor().FullName():
+			case (*descriptorpb.MethodOptions)(nil).ProtoReflect().Descriptor().FullName():
+			default:
+				return errors.New("extension field %q cannot be declared in proto3 unless extended descriptor options", x.FullName())
+			}
+		}
+	}
+	return nil
+}
+
+// isOptionalMessage reports whether this is an optional message.
+// If the kind is unknown, it is assumed to be a message.
+func isOptionalMessage(fd protoreflect.FieldDescriptor) bool {
+	return (fd.Kind() == 0 || fd.Kind() == protoreflect.MessageKind) && fd.Cardinality() == protoreflect.Optional
+}
+
+// isPackable checks whether the pack option can be specified.
+func isPackable(fd protoreflect.FieldDescriptor) bool {
+	switch fd.Kind() {
+	case protoreflect.StringKind, protoreflect.BytesKind, protoreflect.MessageKind, protoreflect.GroupKind:
+		return false
+	}
+	return fd.IsList()
+}
+
+// checkValidGroup reports whether fd is a valid group according to the same
+// rules that protoc imposes.
+func checkValidGroup(fd protoreflect.FieldDescriptor) error {
+	md := fd.Message()
+	switch {
+	case fd.Kind() != protoreflect.GroupKind:
+		return nil
+	case fd.Syntax() != protoreflect.Proto2:
+		return errors.New("invalid under proto2 semantics")
+	case md == nil || md.IsPlaceholder():
+		return errors.New("message must be resolvable")
+	case fd.FullName().Parent() != md.FullName().Parent():
+		return errors.New("message and field must be declared in the same scope")
+	case !unicode.IsUpper(rune(md.Name()[0])):
+		return errors.New("message name must start with an uppercase")
+	case fd.Name() != protoreflect.Name(strings.ToLower(string(md.Name()))):
+		return errors.New("field name must be lowercased form of the message name")
+	}
+	return nil
+}
+
+// checkValidMap checks whether the field is a valid map according to the same
+// rules that protoc imposes.
+// See protoc v3.8.0: src/google/protobuf/descriptor.cc:6045-6115
+func checkValidMap(fd protoreflect.FieldDescriptor) error {
+	md := fd.Message()
+	switch {
+	case md == nil || !md.IsMapEntry():
+		return nil
+	case fd.FullName().Parent() != md.FullName().Parent():
+		return errors.New("message and field must be declared in the same scope")
+	case md.Name() != protoreflect.Name(strs.MapEntryName(string(fd.Name()))):
+		return errors.New("incorrect implicit map entry name")
+	case fd.Cardinality() != protoreflect.Repeated:
+		return errors.New("field must be repeated")
+	case md.Fields().Len() != 2:
+		return errors.New("message must have exactly two fields")
+	case md.ExtensionRanges().Len() > 0:
+		return errors.New("message must not have any extension ranges")
+	case md.Enums().Len()+md.Messages().Len()+md.Extensions().Len() > 0:
+		return errors.New("message must not have any nested declarations")
+	}
+	kf := md.Fields().Get(0)
+	vf := md.Fields().Get(1)
+	switch {
+	case kf.Name() != genid.MapEntry_Key_field_name || kf.Number() != genid.MapEntry_Key_field_number || kf.Cardinality() != protoreflect.Optional || kf.ContainingOneof() != nil || kf.HasDefault():
+		return errors.New("invalid key field")
+	case vf.Name() != genid.MapEntry_Value_field_name || vf.Number() != genid.MapEntry_Value_field_number || vf.Cardinality() != protoreflect.Optional || vf.ContainingOneof() != nil || vf.HasDefault():
+		return errors.New("invalid value field")
+	}
+	switch kf.Kind() {
+	case protoreflect.BoolKind: // bool
+	case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind: // int32
+	case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind: // int64
+	case protoreflect.Uint32Kind, protoreflect.Fixed32Kind: // uint32
+	case protoreflect.Uint64Kind, protoreflect.Fixed64Kind: // uint64
+	case protoreflect.StringKind: // string
+	default:
+		return errors.New("invalid key kind: %v", kf.Kind())
+	}
+	if e := vf.Enum(); e != nil && e.Values().Len() > 0 && e.Values().Get(0).Number() != 0 {
+		return errors.New("map enum value must have zero number for the first value")
+	}
+	return nil
+}

vendor/google.golang.org/protobuf/reflect/protodesc/proto.go

@@ -0,0 +1,252 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protodesc
+
+import (
+	"fmt"
+	"strings"
+
+	"google.golang.org/protobuf/internal/encoding/defval"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// ToFileDescriptorProto copies a protoreflect.FileDescriptor into a
+// google.protobuf.FileDescriptorProto message.
+func ToFileDescriptorProto(file protoreflect.FileDescriptor) *descriptorpb.FileDescriptorProto {
+	p := &descriptorpb.FileDescriptorProto{
+		Name:    proto.String(file.Path()),
+		Options: proto.Clone(file.Options()).(*descriptorpb.FileOptions),
+	}
+	if file.Package() != "" {
+		p.Package = proto.String(string(file.Package()))
+	}
+	for i, imports := 0, file.Imports(); i < imports.Len(); i++ {
+		imp := imports.Get(i)
+		p.Dependency = append(p.Dependency, imp.Path())
+		if imp.IsPublic {
+			p.PublicDependency = append(p.PublicDependency, int32(i))
+		}
+		if imp.IsWeak {
+			p.WeakDependency = append(p.WeakDependency, int32(i))
+		}
+	}
+	for i, locs := 0, file.SourceLocations(); i < locs.Len(); i++ {
+		loc := locs.Get(i)
+		l := &descriptorpb.SourceCodeInfo_Location{}
+		l.Path = append(l.Path, loc.Path...)
+		if loc.StartLine == loc.EndLine {
+			l.Span = []int32{int32(loc.StartLine), int32(loc.StartColumn), int32(loc.EndColumn)}
+		} else {
+			l.Span = []int32{int32(loc.StartLine), int32(loc.StartColumn), int32(loc.EndLine), int32(loc.EndColumn)}
+		}
+		l.LeadingDetachedComments = append([]string(nil), loc.LeadingDetachedComments...)
+		if loc.LeadingComments != "" {
+			l.LeadingComments = proto.String(loc.LeadingComments)
+		}
+		if loc.TrailingComments != "" {
+			l.TrailingComments = proto.String(loc.TrailingComments)
+		}
+		if p.SourceCodeInfo == nil {
+			p.SourceCodeInfo = &descriptorpb.SourceCodeInfo{}
+		}
+		p.SourceCodeInfo.Location = append(p.SourceCodeInfo.Location, l)
+
+	}
+	for i, messages := 0, file.Messages(); i < messages.Len(); i++ {
+		p.MessageType = append(p.MessageType, ToDescriptorProto(messages.Get(i)))
+	}
+	for i, enums := 0, file.Enums(); i < enums.Len(); i++ {
+		p.EnumType = append(p.EnumType, ToEnumDescriptorProto(enums.Get(i)))
+	}
+	for i, services := 0, file.Services(); i < services.Len(); i++ {
+		p.Service = append(p.Service, ToServiceDescriptorProto(services.Get(i)))
+	}
+	for i, exts := 0, file.Extensions(); i < exts.Len(); i++ {
+		p.Extension = append(p.Extension, ToFieldDescriptorProto(exts.Get(i)))
+	}
+	if syntax := file.Syntax(); syntax != protoreflect.Proto2 {
+		p.Syntax = proto.String(file.Syntax().String())
+	}
+	return p
+}
+
+// ToDescriptorProto copies a protoreflect.MessageDescriptor into a
+// google.protobuf.DescriptorProto message.
+func ToDescriptorProto(message protoreflect.MessageDescriptor) *descriptorpb.DescriptorProto {
+	p := &descriptorpb.DescriptorProto{
+		Name:    proto.String(string(message.Name())),
+		Options: proto.Clone(message.Options()).(*descriptorpb.MessageOptions),
+	}
+	for i, fields := 0, message.Fields(); i < fields.Len(); i++ {
+		p.Field = append(p.Field, ToFieldDescriptorProto(fields.Get(i)))
+	}
+	for i, exts := 0, message.Extensions(); i < exts.Len(); i++ {
+		p.Extension = append(p.Extension, ToFieldDescriptorProto(exts.Get(i)))
+	}
+	for i, messages := 0, message.Messages(); i < messages.Len(); i++ {
+		p.NestedType = append(p.NestedType, ToDescriptorProto(messages.Get(i)))
+	}
+	for i, enums := 0, message.Enums(); i < enums.Len(); i++ {
+		p.EnumType = append(p.EnumType, ToEnumDescriptorProto(enums.Get(i)))
+	}
+	for i, xranges := 0, message.ExtensionRanges(); i < xranges.Len(); i++ {
+		xrange := xranges.Get(i)
+		p.ExtensionRange = append(p.ExtensionRange, &descriptorpb.DescriptorProto_ExtensionRange{
+			Start:   proto.Int32(int32(xrange[0])),
+			End:     proto.Int32(int32(xrange[1])),
+			Options: proto.Clone(message.ExtensionRangeOptions(i)).(*descriptorpb.ExtensionRangeOptions),
+		})
+	}
+	for i, oneofs := 0, message.Oneofs(); i < oneofs.Len(); i++ {
+		p.OneofDecl = append(p.OneofDecl, ToOneofDescriptorProto(oneofs.Get(i)))
+	}
+	for i, ranges := 0, message.ReservedRanges(); i < ranges.Len(); i++ {
+		rrange := ranges.Get(i)
+		p.ReservedRange = append(p.ReservedRange, &descriptorpb.DescriptorProto_ReservedRange{
+			Start: proto.Int32(int32(rrange[0])),
+			End:   proto.Int32(int32(rrange[1])),
+		})
+	}
+	for i, names := 0, message.ReservedNames(); i < names.Len(); i++ {
+		p.ReservedName = append(p.ReservedName, string(names.Get(i)))
+	}
+	return p
+}
+
+// ToFieldDescriptorProto copies a protoreflect.FieldDescriptor into a
+// google.protobuf.FieldDescriptorProto message.
+func ToFieldDescriptorProto(field protoreflect.FieldDescriptor) *descriptorpb.FieldDescriptorProto {
+	p := &descriptorpb.FieldDescriptorProto{
+		Name:    proto.String(string(field.Name())),
+		Number:  proto.Int32(int32(field.Number())),
+		Label:   descriptorpb.FieldDescriptorProto_Label(field.Cardinality()).Enum(),
+		Options: proto.Clone(field.Options()).(*descriptorpb.FieldOptions),
+	}
+	if field.IsExtension() {
+		p.Extendee = fullNameOf(field.ContainingMessage())
+	}
+	if field.Kind().IsValid() {
+		p.Type = descriptorpb.FieldDescriptorProto_Type(field.Kind()).Enum()
+	}
+	if field.Enum() != nil {
+		p.TypeName = fullNameOf(field.Enum())
+	}
+	if field.Message() != nil {
+		p.TypeName = fullNameOf(field.Message())
+	}
+	if field.HasJSONName() {
+		// A bug in older versions of protoc would always populate the
+		// "json_name" option for extensions when it is meaningless.
+		// When it did so, it would always use the camel-cased field name.
+		if field.IsExtension() {
+			p.JsonName = proto.String(strs.JSONCamelCase(string(field.Name())))
+		} else {
+			p.JsonName = proto.String(field.JSONName())
+		}
+	}
+	if field.Syntax() == protoreflect.Proto3 && field.HasOptionalKeyword() {
+		p.Proto3Optional = proto.Bool(true)
+	}
+	if field.HasDefault() {
+		def, err := defval.Marshal(field.Default(), field.DefaultEnumValue(), field.Kind(), defval.Descriptor)
+		if err != nil && field.DefaultEnumValue() != nil {
+			def = string(field.DefaultEnumValue().Name()) // occurs for unresolved enum values
+		} else if err != nil {
+			panic(fmt.Sprintf("%v: %v", field.FullName(), err))
+		}
+		p.DefaultValue = proto.String(def)
+	}
+	if oneof := field.ContainingOneof(); oneof != nil {
+		p.OneofIndex = proto.Int32(int32(oneof.Index()))
+	}
+	return p
+}
+
+// ToOneofDescriptorProto copies a protoreflect.OneofDescriptor into a
+// google.protobuf.OneofDescriptorProto message.
+func ToOneofDescriptorProto(oneof protoreflect.OneofDescriptor) *descriptorpb.OneofDescriptorProto {
+	return &descriptorpb.OneofDescriptorProto{
+		Name:    proto.String(string(oneof.Name())),
+		Options: proto.Clone(oneof.Options()).(*descriptorpb.OneofOptions),
+	}
+}
+
+// ToEnumDescriptorProto copies a protoreflect.EnumDescriptor into a
+// google.protobuf.EnumDescriptorProto message.
+func ToEnumDescriptorProto(enum protoreflect.EnumDescriptor) *descriptorpb.EnumDescriptorProto {
+	p := &descriptorpb.EnumDescriptorProto{
+		Name:    proto.String(string(enum.Name())),
+		Options: proto.Clone(enum.Options()).(*descriptorpb.EnumOptions),
+	}
+	for i, values := 0, enum.Values(); i < values.Len(); i++ {
+		p.Value = append(p.Value, ToEnumValueDescriptorProto(values.Get(i)))
+	}
+	for i, ranges := 0, enum.ReservedRanges(); i < ranges.Len(); i++ {
+		rrange := ranges.Get(i)
+		p.ReservedRange = append(p.ReservedRange, &descriptorpb.EnumDescriptorProto_EnumReservedRange{
+			Start: proto.Int32(int32(rrange[0])),
+			End:   proto.Int32(int32(rrange[1])),
+		})
+	}
+	for i, names := 0, enum.ReservedNames(); i < names.Len(); i++ {
+		p.ReservedName = append(p.ReservedName, string(names.Get(i)))
+	}
+	return p
+}
+
+// ToEnumValueDescriptorProto copies a protoreflect.EnumValueDescriptor into a
+// google.protobuf.EnumValueDescriptorProto message.
+func ToEnumValueDescriptorProto(value protoreflect.EnumValueDescriptor) *descriptorpb.EnumValueDescriptorProto {
+	return &descriptorpb.EnumValueDescriptorProto{
+		Name:    proto.String(string(value.Name())),
+		Number:  proto.Int32(int32(value.Number())),
+		Options: proto.Clone(value.Options()).(*descriptorpb.EnumValueOptions),
+	}
+}
+
+// ToServiceDescriptorProto copies a protoreflect.ServiceDescriptor into a
+// google.protobuf.ServiceDescriptorProto message.
+func ToServiceDescriptorProto(service protoreflect.ServiceDescriptor) *descriptorpb.ServiceDescriptorProto {
+	p := &descriptorpb.ServiceDescriptorProto{
+		Name:    proto.String(string(service.Name())),
+		Options: proto.Clone(service.Options()).(*descriptorpb.ServiceOptions),
+	}
+	for i, methods := 0, service.Methods(); i < methods.Len(); i++ {
+		p.Method = append(p.Method, ToMethodDescriptorProto(methods.Get(i)))
+	}
+	return p
+}
+
+// ToMethodDescriptorProto copies a protoreflect.MethodDescriptor into a
+// google.protobuf.MethodDescriptorProto message.
+func ToMethodDescriptorProto(method protoreflect.MethodDescriptor) *descriptorpb.MethodDescriptorProto {
+	p := &descriptorpb.MethodDescriptorProto{
+		Name:       proto.String(string(method.Name())),
+		InputType:  fullNameOf(method.Input()),
+		OutputType: fullNameOf(method.Output()),
+		Options:    proto.Clone(method.Options()).(*descriptorpb.MethodOptions),
+	}
+	if method.IsStreamingClient() {
+		p.ClientStreaming = proto.Bool(true)
+	}
+	if method.IsStreamingServer() {
+		p.ServerStreaming = proto.Bool(true)
+	}
+	return p
+}
+
+func fullNameOf(d protoreflect.Descriptor) *string {
+	if d == nil {
+		return nil
+	}
+	if strings.HasPrefix(string(d.FullName()), unknownPrefix) {
+		return proto.String(string(d.FullName()[len(unknownPrefix):]))
+	}
+	return proto.String("." + string(d.FullName()))
+}