organise sessions examples

Former-commit-id: 682472d2cf4ebfc740687522fe5eef77b5bb1a72

_examples/sessions/basic/main.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"github.com/kataras/iris/v12"
+
+	"github.com/kataras/iris/v12/sessions"
+)
+
+const cookieNameForSessionID = "session_id_cookie"
+
+func secret(ctx iris.Context) {
+	// Check if user is authenticated
+	if auth, _ := sessions.Get(ctx).GetBoolean("authenticated"); !auth {
+		ctx.StatusCode(iris.StatusForbidden)
+		return
+	}
+
+	// Print secret message
+	ctx.WriteString("The cake is a lie!")
+}
+
+func login(ctx iris.Context) {
+	session := sessions.Get(ctx)
+
+	// Authentication goes here
+	// ...
+
+	// Set user as authenticated
+	session.Set("authenticated", true)
+}
+
+func logout(ctx iris.Context) {
+	session := sessions.Get(ctx)
+
+	// Revoke users authentication
+	session.Set("authenticated", false)
+}
+
+func main() {
+	app := iris.New()
+	sess := sessions.New(sessions.Config{Cookie: cookieNameForSessionID, AllowReclaim: true})
+	app.Use(sess.Handler())
+	// ^ or comment this line and use sess.Start(ctx) inside your handlers
+	// instead of sessions.Get(ctx).
+
+	app.Get("/secret", secret)
+	app.Get("/login", login)
+	app.Get("/logout", logout)
+
+	app.Listen(":8080")
+}