implemented login and jwt auth

internal/common/crypto.go

@@ -0,0 +1,31 @@
+package common
+
+import (
+	"crypto/rand"
+	"crypto/sha512"
+	"encoding/base64"
+
+	"github.com/rs/zerolog/log"
+)
+
+func HashPassword(pwd string) []byte {
+	h := sha512.New()
+	h.Write([]byte(pwd))
+	return h.Sum(nil)
+}
+
+func generateJWTKey(size int) string {
+	bytes := make([]byte, size)
+	if _, err := rand.Read(bytes); err != nil {
+		log.Panic().Err(err).Msg("failed to generate jwt key")
+	}
+	return base64.URLEncoding.EncodeToString(bytes)
+}
+
+func decodeJWTKey(key string) []byte {
+	bytes, err := base64.URLEncoding.DecodeString(key)
+	if err != nil {
+		log.Panic().Err(err).Msg("failed to decode jwt key")
+	}
+	return bytes
+}