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