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// 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 }