feat(storage-server): jwt based authentication

cmd/storage-server/command/flag/flag.go

@@ -0,0 +1,43 @@
+package flag
+
+import (
+	"github.com/lestrrat-go/jwx/v2/jwa"
+	"github.com/urfave/cli/v2"
+)
+
+const PrivateKeyFlagName = "private-key"
+
+var PrivateKey = &cli.StringFlag{
+	Name:      PrivateKeyFlagName,
+	EnvVars:   []string{"STORAGE_SERVER_PRIVATE_KEY"},
+	Value:     "storage-server.key",
+	TakesFile: true,
+}
+
+func GetPrivateKey(ctx *cli.Context) string {
+	return ctx.String(PrivateKeyFlagName)
+}
+
+const SigningAlgorithmFlagName = "signing-algorithm"
+
+var PrivateKeySigningAlgorithm = &cli.StringFlag{
+	Name:    SigningAlgorithmFlagName,
+	EnvVars: []string{"STORAGE_SERVER_PRIVATE_KEY_SIGNING_ALGORITHM"},
+	Value:   jwa.RS256.String(),
+}
+
+func GetSigningAlgorithm(ctx *cli.Context) string {
+	return ctx.String(SigningAlgorithmFlagName)
+}
+
+const PrivateKeyDefaultSizeFlagName = "private-key-default-size"
+
+var PrivateKeyDefaultSize = &cli.IntFlag{
+	Name:    PrivateKeyDefaultSizeFlagName,
+	EnvVars: []string{"STORAGE_SERVER_PRIVATE_KEY_DEFAULT_SIZE"},
+	Value:   2048,
+}
+
+func GetPrivateKeyDefaultSize(ctx *cli.Context) int {
+	return ctx.Int(PrivateKeyDefaultSizeFlagName)
+}