mirror of
https://github.com/strongdm/comply
synced 2024-08-28 18:13:33 +00:00
152 lines
5.0 KiB
Go
152 lines
5.0 KiB
Go
// Go support for Protocol Buffers - Google's data interchange format
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//
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// Copyright 2017 The Go Authors. All rights reserved.
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// https://github.com/golang/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package proto
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import (
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"fmt"
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"reflect"
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"strings"
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)
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// DiscardUnknown recursively discards all unknown fields from this message
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// and all embedded messages.
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//
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// When unmarshaling a message with unrecognized fields, the tags and values
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// of such fields are preserved in the Message. This allows a later call to
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// marshal to be able to produce a message that continues to have those
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// unrecognized fields. To avoid this, DiscardUnknown is used to
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// explicitly clear the unknown fields after unmarshaling.
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//
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// For proto2 messages, the unknown fields of message extensions are only
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// discarded from messages that have been accessed via GetExtension.
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func DiscardUnknown(m Message) {
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discardLegacy(m)
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}
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func discardLegacy(m Message) {
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v := reflect.ValueOf(m)
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if v.Kind() != reflect.Ptr || v.IsNil() {
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return
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}
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v = v.Elem()
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if v.Kind() != reflect.Struct {
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return
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}
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t := v.Type()
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for i := 0; i < v.NumField(); i++ {
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f := t.Field(i)
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if strings.HasPrefix(f.Name, "XXX_") {
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continue
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}
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vf := v.Field(i)
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tf := f.Type
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// Unwrap tf to get its most basic type.
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var isPointer, isSlice bool
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if tf.Kind() == reflect.Slice && tf.Elem().Kind() != reflect.Uint8 {
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isSlice = true
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tf = tf.Elem()
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}
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if tf.Kind() == reflect.Ptr {
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isPointer = true
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tf = tf.Elem()
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}
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if isPointer && isSlice && tf.Kind() != reflect.Struct {
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panic(fmt.Sprintf("%T.%s cannot be a slice of pointers to primitive types", m, f.Name))
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}
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switch tf.Kind() {
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case reflect.Struct:
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switch {
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case !isPointer:
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panic(fmt.Sprintf("%T.%s cannot be a direct struct value", m, f.Name))
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case isSlice: // E.g., []*pb.T
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for j := 0; j < vf.Len(); j++ {
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discardLegacy(vf.Index(j).Interface().(Message))
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}
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default: // E.g., *pb.T
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discardLegacy(vf.Interface().(Message))
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}
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case reflect.Map:
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switch {
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case isPointer || isSlice:
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panic(fmt.Sprintf("%T.%s cannot be a pointer to a map or a slice of map values", m, f.Name))
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default: // E.g., map[K]V
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tv := vf.Type().Elem()
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if tv.Kind() == reflect.Ptr && tv.Implements(protoMessageType) { // Proto struct (e.g., *T)
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for _, key := range vf.MapKeys() {
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val := vf.MapIndex(key)
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discardLegacy(val.Interface().(Message))
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}
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}
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}
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case reflect.Interface:
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// Must be oneof field.
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switch {
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case isPointer || isSlice:
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panic(fmt.Sprintf("%T.%s cannot be a pointer to a interface or a slice of interface values", m, f.Name))
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default: // E.g., test_proto.isCommunique_Union interface
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if !vf.IsNil() && f.Tag.Get("protobuf_oneof") != "" {
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vf = vf.Elem() // E.g., *test_proto.Communique_Msg
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if !vf.IsNil() {
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vf = vf.Elem() // E.g., test_proto.Communique_Msg
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vf = vf.Field(0) // E.g., Proto struct (e.g., *T) or primitive value
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if vf.Kind() == reflect.Ptr {
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discardLegacy(vf.Interface().(Message))
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}
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}
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}
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}
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}
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}
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if vf := v.FieldByName("XXX_unrecognized"); vf.IsValid() {
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if vf.Type() != reflect.TypeOf([]byte{}) {
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panic("expected XXX_unrecognized to be of type []byte")
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}
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vf.Set(reflect.ValueOf([]byte(nil)))
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}
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// For proto2 messages, only discard unknown fields in message extensions
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// that have been accessed via GetExtension.
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if em, ok := extendable(m); ok {
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// Ignore lock since discardLegacy is not concurrency safe.
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emm, _ := em.extensionsRead()
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for _, mx := range emm {
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if m, ok := mx.value.(Message); ok {
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discardLegacy(m)
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}
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}
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}
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}
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