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package pgproto3
import (
"bytes"
"encoding/hex"
"encoding/json"
"errors"
"github.com/jackc/pgx/v5/internal/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: string(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
}
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