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61 changes: 50 additions & 11 deletions protos/protos.go
Original file line number Diff line number Diff line change
Expand Up @@ -7,26 +7,65 @@ import (
"google.golang.org/protobuf/reflect/protoreflect"
)

// RemoveSensitiveFields replaces sensitive fields with their first letter followed by "****".
func RemoveSensitiveFields(msg proto.Message) proto.Message {
msgReflect := msg.ProtoReflect()
msgCopy := msgReflect.New() // Create a new copy
return removeSensitive(msg.ProtoReflect()).Interface()
}

func removeSensitive(msg protoreflect.Message) protoreflect.Message {
msgCopy := msg.New()

msgReflect.Range(func(fd protoreflect.FieldDescriptor, value protoreflect.Value) bool {
// Check if the field has the "sensitive" annotation
if proto.GetExtension(fd.Options(), annotationspb.E_Sensitive).(bool) {
msg.Range(func(fd protoreflect.FieldDescriptor, value protoreflect.Value) bool {
if fd.IsList() {
// Handle repeated fields
list := msgCopy.NewField(fd).List()
for i := 0; i < value.List().Len(); i++ {
item := value.List().Get(i)
if fd.Kind() == protoreflect.MessageKind {
list.Append(protoreflect.ValueOfMessage(
removeSensitive(item.Message())))
} else {
list.Append(item)
}
}
msgCopy.Set(fd, protoreflect.ValueOfList(list))
return true
}

if fd.IsMap() {
// Handle map fields
mapVal := msgCopy.NewField(fd).Map()
value.Map().Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
if fd.MapValue().Kind() == protoreflect.MessageKind {
mapVal.Set(k, protoreflect.ValueOfMessage(removeSensitive(v.Message())))
} else {
mapVal.Set(k, v)
}
return true
})
msgCopy.Set(fd, protoreflect.ValueOfMap(mapVal))
return true
}

if fd.Kind() == protoreflect.MessageKind {
// Recurse into sub-message
msgCopy.Set(fd, protoreflect.ValueOfMessage(removeSensitive(value.Message())))
return true
}

// Handle scalar sensitive fields
if extVal, ok := proto.GetExtension(fd.Options(), annotationspb.E_Sensitive).(bool); ok && extVal {
strVal := value.String()
if len(strVal) > 0 {
// Replace with first letter + "****"
sanitizedVal := string(strVal[0]) + "****"
msgCopy.Set(fd, protoreflect.ValueOfString(sanitizedVal))
sanitized := string(strVal[0]) + "****"
msgCopy.Set(fd, protoreflect.ValueOfString(sanitized))
}
return true
}
// Copy non-sensitive fields as is

// Normal scalar field
msgCopy.Set(fd, value)
return true
})

return msgCopy.Interface()
return msgCopy
}
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