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package pgproto3
import (
"bytes"
"encoding/binary"
"encoding/json"
"errors"
"github.com/jackc/pgx/v5/internal/pgio"
)
// AuthenticationSASL is a message sent from the backend indicating that SASL authentication is required.
type AuthenticationSASL struct {
AuthMechanisms []string
}
// Backend identifies this message as sendable by the PostgreSQL backend.
func (*AuthenticationSASL) Backend() {}
// Backend identifies this message as an authentication response.
func (*AuthenticationSASL) 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 *AuthenticationSASL) Decode(src []byte) error {
if len(src) < 4 {
return errors.New("authentication message too short")
}
authType := binary.BigEndian.Uint32(src)
if authType != AuthTypeSASL {
return errors.New("bad auth type")
}
authMechanisms := src[4:]
for len(authMechanisms) > 1 {
idx := bytes.IndexByte(authMechanisms, 0)
if idx == -1 {
return &invalidMessageFormatErr{messageType: "AuthenticationSASL", details: "unterminated string"}
}
dst.AuthMechanisms = append(dst.AuthMechanisms, string(authMechanisms[:idx]))
authMechanisms = authMechanisms[idx+1:]
}
return nil
}
// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
func (src *AuthenticationSASL) Encode(dst []byte) []byte {
dst = append(dst, 'R')
sp := len(dst)
dst = pgio.AppendInt32(dst, -1)
dst = pgio.AppendUint32(dst, AuthTypeSASL)
for _, s := range src.AuthMechanisms {
dst = append(dst, []byte(s)...)
dst = append(dst, 0)
}
dst = append(dst, 0)
pgio.SetInt32(dst[sp:], int32(len(dst[sp:])))
return dst
}
// MarshalJSON implements encoding/json.Marshaler.
func (src AuthenticationSASL) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Type string
AuthMechanisms []string
}{
Type: "AuthenticationSASL",
AuthMechanisms: src.AuthMechanisms,
})
}
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