Overhaul [1/n]

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/handler/webui/logout.go

@@ -0,0 +1,26 @@
+package webui
+
+import (
+	"honoka-chan/internal/middleware"
+	"honoka-chan/internal/router"
+	"net/http"
+
+	"github.com/gin-contrib/sessions"
+	"github.com/gin-gonic/gin"
+)
+
+func logout(ctx *gin.Context) {
+	session := sessions.Default(ctx)
+	session.Clear()
+	session.Options(sessions.Options{
+		Path:   "/admin",
+		MaxAge: -1,
+	})
+	session.Save()
+
+	ctx.Redirect(http.StatusFound, "/admin/login")
+}
+
+func init() {
+	router.AddHandler("admin", "GET", "/logout", middleware.WebAuth, logout)
+}