github.com/jackc/pgx/v5@v5.5.5/pgproto3/sasl_initial_response.go (about)

     1  package pgproto3
     2  
     3  import (
     4  	"bytes"
     5  	"encoding/hex"
     6  	"encoding/json"
     7  	"errors"
     8  
     9  	"github.com/jackc/pgx/v5/internal/pgio"
    10  )
    11  
    12  type SASLInitialResponse struct {
    13  	AuthMechanism string
    14  	Data          []byte
    15  }
    16  
    17  // Frontend identifies this message as sendable by a PostgreSQL frontend.
    18  func (*SASLInitialResponse) Frontend() {}
    19  
    20  // Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
    21  // type identifier and 4 byte message length.
    22  func (dst *SASLInitialResponse) Decode(src []byte) error {
    23  	*dst = SASLInitialResponse{}
    24  
    25  	rp := 0
    26  
    27  	idx := bytes.IndexByte(src, 0)
    28  	if idx < 0 {
    29  		return errors.New("invalid SASLInitialResponse")
    30  	}
    31  
    32  	dst.AuthMechanism = string(src[rp:idx])
    33  	rp = idx + 1
    34  
    35  	rp += 4 // The rest of the message is data so we can just skip the size
    36  	dst.Data = src[rp:]
    37  
    38  	return nil
    39  }
    40  
    41  // Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
    42  func (src *SASLInitialResponse) Encode(dst []byte) ([]byte, error) {
    43  	dst, sp := beginMessage(dst, 'p')
    44  
    45  	dst = append(dst, []byte(src.AuthMechanism)...)
    46  	dst = append(dst, 0)
    47  
    48  	dst = pgio.AppendInt32(dst, int32(len(src.Data)))
    49  	dst = append(dst, src.Data...)
    50  
    51  	return finishMessage(dst, sp)
    52  }
    53  
    54  // MarshalJSON implements encoding/json.Marshaler.
    55  func (src SASLInitialResponse) MarshalJSON() ([]byte, error) {
    56  	return json.Marshal(struct {
    57  		Type          string
    58  		AuthMechanism string
    59  		Data          string
    60  	}{
    61  		Type:          "SASLInitialResponse",
    62  		AuthMechanism: src.AuthMechanism,
    63  		Data:          string(src.Data),
    64  	})
    65  }
    66  
    67  // UnmarshalJSON implements encoding/json.Unmarshaler.
    68  func (dst *SASLInitialResponse) UnmarshalJSON(data []byte) error {
    69  	// Ignore null, like in the main JSON package.
    70  	if string(data) == "null" {
    71  		return nil
    72  	}
    73  
    74  	var msg struct {
    75  		AuthMechanism string
    76  		Data          string
    77  	}
    78  	if err := json.Unmarshal(data, &msg); err != nil {
    79  		return err
    80  	}
    81  	dst.AuthMechanism = msg.AuthMechanism
    82  	if msg.Data != "" {
    83  		decoded, err := hex.DecodeString(msg.Data)
    84  		if err != nil {
    85  			return err
    86  		}
    87  		dst.Data = decoded
    88  	}
    89  	return nil
    90  }