1 files changed, 69 insertions, 0 deletions
diff --git a/internal/utils/utils.go b/internal/utils/utils.go
new file mode 100644
index 0000000..a453107
--- /dev/null
+++ b/internal/utils/utils.go
@@ -0,0 +1,69 @@
+package utils
+
+import (
+	"crypto"
+	"crypto/ed25519"
+	"encoding/hex"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"git.sigsum.org/sigsum-go/pkg/log"
+	"git.sigsum.org/sigsum-go/pkg/types"
+)
+
+// TODO: Move SetupLogging to sigsum-go/pkg/log
+
+func SetupLogging(logFile, logLevel string, logColor bool) error {
+	if len(logFile) != 0 {
+		f, err := os.OpenFile(logFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+		if err != nil {
+			return err
+		}
+		log.SetOutput(f)
+	}
+
+	switch logLevel {
+	case "debug":
+		log.SetLevel(log.DebugLevel)
+	case "info":
+		log.SetLevel(log.InfoLevel)
+	case "warning":
+		log.SetLevel(log.WarningLevel)
+	case "error":
+		log.SetLevel(log.ErrorLevel)
+	default:
+		return fmt.Errorf("invalid logging level %s", logLevel)
+	}
+
+	log.SetColor(logColor)
+	return nil
+}
+
+func PubkeyFromHexString(pkhex string) (*types.PublicKey, error) {
+	pkbuf, err := hex.DecodeString(pkhex)
+	if err != nil {
+		return nil, fmt.Errorf("DecodeString: %v", err)
+	}
+
+	var pk types.PublicKey
+	if n := copy(pk[:], pkbuf); n != types.PublicKeySize {
+		return nil, fmt.Errorf("invalid pubkey size: %v", n)
+	}
+
+	return &pk, nil
+}
+
+func NewLogIdentity(keyFile string) (crypto.Signer, string, error) {
+	buf, err := ioutil.ReadFile(keyFile)
+	if err != nil {
+		return nil, "", err
+	}
+	if buf, err = hex.DecodeString(strings.TrimSpace(string(buf))); err != nil {
+		return nil, "", fmt.Errorf("DecodeString: %v", err)
+	}
+	sk := crypto.Signer(ed25519.NewKeyFromSeed(buf))
+	vk := sk.Public().(ed25519.PublicKey)
+	return sk, hex.EncodeToString([]byte(vk[:])), nil
+}