types/key: add database scan/value to publickeys

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

types/key/disco.go

@@ -5,6 +5,8 @@ package key
 
 import (
 	"crypto/subtle"
+	"database/sql/driver"
+	"errors"
 	"fmt"
 
 	"go4.org/mem"
@@ -142,6 +144,29 @@ func (k *DiscoPublic) UnmarshalText(b []byte) error {
 	return parseHex(k.k[:], mem.B(b), mem.S(discoPublicHexPrefix))
 }
 
+func (k DiscoPublic) Value() (driver.Value, error) {
+	return k.MarshalText()
+}
+
+func (k *DiscoPublic) Scan(value interface{}) error {
+	var val []byte
+	switch value.(type) {
+	case string:
+		val = []byte(value.(string))
+	case []byte:
+		val = value.([]byte)
+	default:
+		return errors.New("Incompatible type for DiscoPublic")
+	}
+
+	err := k.UnmarshalText(val)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 type DiscoShared struct {
 	_ structs.Incomparable // because == isn't constant-time
 	k [32]byte

types/key/machine.go

@@ -6,7 +6,9 @@ package key
 import (
 	"bytes"
 	"crypto/subtle"
+	"database/sql/driver"
 	"encoding/hex"
+	"errors"
 
 	"go4.org/mem"
 	"golang.org/x/crypto/curve25519"
@@ -262,3 +264,26 @@ func (k MachinePublic) MarshalText() ([]byte, error) {
 func (k *MachinePublic) UnmarshalText(b []byte) error {
 	return parseHex(k.k[:], mem.B(b), mem.S(machinePublicHexPrefix))
 }
+
+func (k MachinePublic) Value() (driver.Value, error) {
+	return k.MarshalText()
+}
+
+func (k *MachinePublic) Scan(value interface{}) error {
+	var val []byte
+	switch value.(type) {
+	case string:
+		val = []byte(value.(string))
+	case []byte:
+		val = value.([]byte)
+	default:
+		return errors.New("Incompatible type for MachinePublic")
+	}
+
+	err := k.UnmarshalText(val)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

types/key/node.go

@@ -7,6 +7,7 @@ import (
 	"bufio"
 	"bytes"
 	"crypto/subtle"
+	"database/sql/driver"
 	"encoding/hex"
 	"errors"
 	"fmt"
@@ -379,3 +380,26 @@ func (k NodePublic) WireGuardGoString() string {
 	b[second+3] = b64((k.k[31] << 2) & 63)
 	return string(b)
 }
+
+func (k NodePublic) Value() (driver.Value, error) {
+	return k.MarshalText()
+}
+
+func (k *NodePublic) Scan(value interface{}) error {
+	var val []byte
+	switch value.(type) {
+	case string:
+		val = []byte(value.(string))
+	case []byte:
+		val = value.([]byte)
+	default:
+		return errors.New("Incompatible type for NodePublic")
+	}
+
+	err := k.UnmarshalText(val)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}