feat: implement passkey-based authentication

internal/gateway/handlers/index/model.go

@@ -0,0 +1,36 @@
+package index
+
+import (
+	"github.com/labstack/echo/v4"
+	"github.com/onsonr/sonr/internal/gateway/session"
+)
+
+// Initial users have no authorization, user handle, or vault address
+func isInitial(c echo.Context) bool {
+	sess, err := session.Get(c)
+	if err != nil {
+		return false
+	}
+	data := sess.Session()
+	return data.UserHandle == "" && data.VaultAddress == ""
+}
+
+// Expired users have either a user handle or vault address
+func isExpired(c echo.Context) bool {
+	sess, err := session.Get(c)
+	if err != nil {
+		return false
+	}
+	data := sess.Session()
+	return data.UserHandle != "" || data.VaultAddress != ""
+}
+
+// Returning users have a valid authorization, and either a user handle or vault address
+func isReturning(c echo.Context) bool {
+	sess, err := session.Get(c)
+	if err != nil {
+		return false
+	}
+	data := sess.Session()
+	return data.UserHandle != "" && data.VaultAddress != ""
+}