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package app
import (
"crypto/tls"
"fmt"
"github.com/spf13/viper"
)
type tlsFlagPrefix string
func (t tlsFlagPrefix) CertFile() string { return viper.GetString(string(t) + "tls-cert-file") }
func (t tlsFlagPrefix) KeyFile() string { return viper.GetString(string(t) + "tls-key-file") }
func (t tlsFlagPrefix) CertData() string { return viper.GetString(string(t) + "tls-cert-data") }
func (t tlsFlagPrefix) KeyData() string { return viper.GetString(string(t) + "tls-key-data") }
func (t tlsFlagPrefix) Listen() string { return viper.GetString(string(t) + "listen-tls") }
func (t tlsFlagPrefix) HasFiles() bool {
return t.CertFile() != "" || t.KeyFile() != ""
}
func (t tlsFlagPrefix) HasData() bool {
return t.CertData() != "" || t.KeyData() != ""
}
func (t tlsFlagPrefix) HasAny() bool {
return t.HasFiles() || t.HasData() || t.Listen() != ""
}
// getTLSConfig creates a static TLS config using supplied certificate values.
// Returns nil if no certificate values are set.
func getTLSConfig(t tlsFlagPrefix) (*tls.Config, error) {
if !t.HasAny() {
return nil, nil
}
var cert tls.Certificate
var err error
switch {
case t.HasFiles() == t.HasData(): // both set or unset
return nil, fmt.Errorf("invalid tls config: exactly one of --%stls-cert-file and --%stls-key-file OR --%stls-cert-data and --%stls-key-data must be specified", t, t, t, t)
case t.HasFiles():
cert, err = tls.LoadX509KeyPair(t.CertFile(), t.KeyFile())
if err != nil {
return nil, fmt.Errorf("load tls cert files: %w", err)
}
case t.HasData():
cert, err = tls.X509KeyPair([]byte(t.CertData()), []byte(t.KeyData()))
if err != nil {
return nil, fmt.Errorf("parse tls cert: %w", err)
}
}
return &tls.Config{Certificates: []tls.Certificate{cert}}, nil
}
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