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package filepb
import (
"errors"
"fmt"
"os"
"strings"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/encoding/prototext"
"google.golang.org/protobuf/proto"
)
var ErrEmpty error = fmt.Errorf("config file was empty")
var ErrMarshal error = fmt.Errorf("protobuf parse error")
// print the protobuf in human form
func IdentifyPB(filename string) (string, string, error) {
var pb *FakeFile
pb = new(FakeFile)
if err := pb.loadFromFilename(filename); err != nil {
return "", "", err
}
return pb.Version, pb.Uuid, nil
}
func (pb *FakeFile) loadFromFilename(fullname string) error {
if strings.HasSuffix(fullname, ".text") {
return loadTEXT(pb, fullname)
}
if strings.HasSuffix(fullname, ".json") {
return loadJSON(pb, fullname)
}
if strings.HasSuffix(fullname, ".pb") {
return loadPB(pb, fullname)
}
return fmt.Errorf("unknown filetype '%s'", fullname)
}
func loadPB(pb proto.Message, fullname string) error {
data, err := loadFile(fullname)
if err != nil {
// set pb.Filename that was attempted
return err
}
if err = proto.Unmarshal(data, pb); err != nil {
return err
}
return nil
}
func loadTEXT(pb proto.Message, fullname string) error {
var data []byte
var err error
if data, err = loadFile(fullname); err != nil {
return err
}
// don't even bother with Marshal()
if data == nil {
return ErrEmpty // file is empty
}
unmarshalOpts := prototext.UnmarshalOptions{
DiscardUnknown: true,
}
// Unmarshal()
if err = unmarshalOpts.Unmarshal(data, pb); err != nil {
return ErrMarshal
}
return nil
}
// json files are backup Marshal() data in case .text Unmarshal() fails
// they always should have the ".text" filename in them
func loadJSON(pb proto.Message, fullname string) error {
var data []byte
var err error
if data, err = loadFile(fullname); err != nil {
return err
}
// don't even bother with Marshal()
if data == nil {
return ErrEmpty // file is empty
}
// Unmarshal()
if err = protojson.Unmarshal(data, pb); err != nil {
return ErrMarshal
}
return nil
}
func loadFile(fullname string) ([]byte, error) {
data, err := os.ReadFile(fullname)
if errors.Is(err, os.ErrNotExist) {
// if file does not exist, just return nil. this
return nil, err
}
if err != nil {
return nil, err
}
if len(data) == 0 {
return data, ErrEmpty
}
return data, nil
}
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