1 files changed, 39 insertions, 0 deletions
diff --git a/internal/router/api-v1-general-page-header.go b/internal/router/api-v1-general-page-header.go
new file mode 100644
index 0000000..8ac7c03
--- /dev/null
+++ b/internal/router/api-v1-general-page-header.go
@@ -0,0 +1,39 @@
+package router
+
+import (
+	"fmt"
+	"net/url"
+	"slices"
+	"strings"
+
+	"github.com/SayaAndy/saya-today-web/locale"
+	"github.com/gofiber/fiber/v2"
+)
+
+func Api_V1_GeneralPage_Header(l map[string]*locale.LocaleConfig, langs []string) func(c *fiber.Ctx) error {
+	return func(c *fiber.Ctx) error {
+		c.Set(fiber.HeaderContentType, fiber.MIMETextPlainCharsetUTF8)
+
+		referer := c.Get("Referer", "")
+		if referer == "" {
+			return c.Status(fiber.ErrBadRequest.Code).SendString("'Referer' header is empty")
+		}
+		urlStruct, err := url.ParseRequestURI(referer)
+		if err != nil {
+			return c.Status(fiber.ErrBadRequest.Code).SendString(fmt.Sprintf("'Referer' header is invalid: %s", err.Error()))
+		}
+
+		path := urlStruct.EscapedPath()
+		pathParts := strings.SplitN(strings.Trim(path, "/"), "/", 2)
+		if len(pathParts) < 2 {
+			return c.Status(fiber.ErrBadRequest.Code).SendString("'Referer' header is invalid: expect format '/{lang}/...'")
+		}
+
+		lang := pathParts[0]
+		if !slices.Contains(langs, lang) {
+			return c.Status(fiber.ErrNotFound.Code).SendString(fmt.Sprintf("server does not support '%s' language... yet??", lang))
+		}
+
+		return nil
+	}
+}