feat: hCaptcha middleware

internal/net/gphttp/middleware/captcha/session.go

@@ -0,0 +1,34 @@
+package captcha
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"time"
+
+	_ "embed"
+
+	"github.com/yusing/go-proxy/internal/jsonstore"
+	"github.com/yusing/go-proxy/internal/utils"
+)
+
+type CaptchaSession struct {
+	ID string `json:"id"`
+
+	Expiry time.Time `json:"expiry"`
+}
+
+var CaptchaSessions = jsonstore.Store[*CaptchaSession]("captcha_sessions")
+
+func newCaptchaSession(p Provider) *CaptchaSession {
+	buf := make([]byte, 32)
+	_, _ = rand.Read(buf)
+	now := utils.TimeNow()
+	return &CaptchaSession{
+		ID:     hex.EncodeToString(buf),
+		Expiry: now.Add(p.SessionExpiry()),
+	}
+}
+
+func (s *CaptchaSession) expired() bool {
+	return utils.TimeNow().After(s.Expiry)
+}