package pgproto3 import ( "encoding/binary" "encoding/json" "errors" "github.com/jackc/pgio" ) // AuthenticationSASLContinue is a message sent from the backend containing a SASL challenge. type AuthenticationSASLContinue struct { Data []byte } // Backend identifies this message as sendable by the PostgreSQL backend. func (*AuthenticationSASLContinue) Backend() {} // Backend identifies this message as an authentication response. func (*AuthenticationSASLContinue) AuthenticationResponse() {} // 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 *AuthenticationSASLContinue) Decode(src []byte) error { if len(src) < 4 { return errors.New("authentication message too short") } authType := binary.BigEndian.Uint32(src) if authType != AuthTypeSASLContinue { return errors.New("bad auth type") } dst.Data = src[4:] return nil } // Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length. func (src *AuthenticationSASLContinue) Encode(dst []byte) []byte { dst = append(dst, 'R') sp := len(dst) dst = pgio.AppendInt32(dst, -1) dst = pgio.AppendUint32(dst, AuthTypeSASLContinue) dst = append(dst, src.Data...) pgio.SetInt32(dst[sp:], int32(len(dst[sp:]))) return dst } // MarshalJSON implements encoding/json.Marshaler. func (src AuthenticationSASLContinue) MarshalJSON() ([]byte, error) { return json.Marshal(struct { Type string Data string }{ Type: "AuthenticationSASLContinue", Data: string(src.Data), }) } // UnmarshalJSON implements encoding/json.Unmarshaler. func (dst *AuthenticationSASLContinue) UnmarshalJSON(data []byte) error { // Ignore null, like in the main JSON package. if string(data) == "null" { return nil } var msg struct { Data string } if err := json.Unmarshal(data, &msg); err != nil { return err } dst.Data = []byte(msg.Data) return nil }