From d00ba0c4f1fe625eaf05d8a8cff8fd0f145f8414 Mon Sep 17 00:00:00 2001
From: Manfred Touron <94029+moul@users.noreply.github.com>
Date: Sun, 28 Mar 2021 20:57:02 +0000
Subject: [PATCH] feat: add random captcha

Signed-off-by: Manfred Touron <94029+moul@users.noreply.github.com>
---
 captcha/random.go      | 13 +++++++++++++
 captcha/random_test.go | 30 ++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 captcha/random.go
 create mode 100644 captcha/random_test.go

diff --git a/captcha/random.go b/captcha/random.go
new file mode 100644
index 0000000..4a98798
--- /dev/null
+++ b/captcha/random.go
@@ -0,0 +1,13 @@
+package captcha
+
+import (
+	"math/rand"
+)
+
+func NewRandomCaptcha() Captcha {
+	availables := []func() Captcha{
+		NewBannerCaptcha,
+		NewMathCaptcha,
+	}
+	return availables[rand.Intn(len(availables))]() // nolint:gosec
+}
diff --git a/captcha/random_test.go b/captcha/random_test.go
new file mode 100644
index 0000000..6803414
--- /dev/null
+++ b/captcha/random_test.go
@@ -0,0 +1,30 @@
+package captcha_test
+
+import (
+	"fmt"
+	"math/rand"
+
+	"moul.io/captcha/captcha"
+)
+
+func ExampleNewRandomCaptcha() {
+	rand.Seed(42)
+
+	// first captcha
+	c := captcha.NewRandomCaptcha()
+	question, _ := c.Question()
+	fmt.Println(question)
+
+	// second captcha
+	c = captcha.NewRandomCaptcha()
+	question, _ = c.Question()
+	fmt.Println(question)
+
+	// Output:
+	// 3 + 4
+	//        _    _
+	//  _ __ | |_ | |_  _  _  ___
+	// | '_ \|  _||  _|| || |/ -_)
+	// | .__/ \__| \__| \_,_|\___|
+	// |_|
+}