add the visitor API endpoint

api/routes/visitor.go

@@ -0,0 +1,50 @@
+package routes
+
+import (
+	"github.com/gofiber/fiber/v2"
+	"github.com/ngn13/website/api/database"
+	"github.com/ngn13/website/api/util"
+)
+
+const LAST_ADDRS_MAX = 30
+
+var last_addrs []string
+
+func GET_Visitor(c *fiber.Ctx) error {
+	var (
+		err   error
+		count uint64
+	)
+
+	db := c.Locals("database").(*database.Type)
+	new_addr := util.GetSHA1(util.IP(c))
+
+	for _, addr := range last_addrs {
+		if new_addr == addr {
+			if count, err = db.VisitorGet(); err != nil {
+				return util.ErrInternal(c, err)
+			}
+
+			return util.JSON(c, 200, fiber.Map{
+				"result": count,
+			})
+		}
+	}
+
+	if err = db.VisitorIncrement(); err != nil {
+		return util.ErrInternal(c, err)
+	}
+
+	if count, err = db.VisitorGet(); err != nil {
+		return util.ErrInternal(c, err)
+	}
+
+	if len(last_addrs) > LAST_ADDRS_MAX {
+		last_addrs = append(last_addrs[:0], last_addrs[1:]...)
+		last_addrs = append(last_addrs, new_addr)
+	}
+
+	return util.JSON(c, 200, fiber.Map{
+		"result": count,
+	})
+}