package pgproto3 import ( "bytes" "encoding/hex" "encoding/json" "errors" "github.com/jackc/pgio" ) type SASLInitialResponse struct { AuthMechanism string Data []byte } // Frontend identifies this message as sendable by a PostgreSQL frontend. func (*SASLInitialResponse) Frontend() {} // Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message // type identifier and 4 byte message length. func (dst *SASLInitialResponse) Decode(src []byte) error { *dst = SASLInitialResponse{} rp := 0 idx := bytes.IndexByte(src, 0) if idx < 0 { return errors.New("invalid SASLInitialResponse") } dst.AuthMechanism = string(src[rp:idx]) rp = idx + 1 rp += 4 // The rest of the message is data so we can just skip the size dst.Data = src[rp:] return nil } // Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length. func (src *SASLInitialResponse) Encode(dst []byte) []byte { dst = append(dst, 'p') sp := len(dst) dst = pgio.AppendInt32(dst, -1) dst = append(dst, []byte(src.AuthMechanism)...) dst = append(dst, 0) dst = pgio.AppendInt32(dst, int32(len(src.Data))) dst = append(dst, src.Data...) pgio.SetInt32(dst[sp:], int32(len(dst[sp:]))) return dst } // MarshalJSON implements encoding/json.Marshaler. func (src SASLInitialResponse) MarshalJSON() ([]byte, error) { return json.Marshal(struct { Type string AuthMechanism string Data string }{ Type: "SASLInitialResponse", AuthMechanism: src.AuthMechanism, Data: hex.EncodeToString(src.Data), }) } // UnmarshalJSON implements encoding/json.Unmarshaler. func (dst *SASLInitialResponse) UnmarshalJSON(data []byte) error { // Ignore null, like in the main JSON package. if string(data) == "null" { return nil } var msg struct { AuthMechanism string Data string } if err := json.Unmarshal(data, &msg); err != nil { return err } dst.AuthMechanism = msg.AuthMechanism if msg.Data != "" { decoded, err := hex.DecodeString(msg.Data) if err != nil { return err } dst.Data = decoded } return nil }