fatto ordine

controllers/subscribe_controller.go

@@ -0,0 +1,88 @@
+package controllers
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"log"
+	"net/mail"
+	"strings"
+	"time"
+
+	"github.com/gofiber/fiber/v3"
+	"gorm.io/gorm"
+)
+
+type SubscribeController struct {
+	DB                 *gorm.DB
+	IsUniqueConstraint func(error) bool
+}
+
+type subscribeRequest struct {
+	Email       string         `json:"email"`
+	BrowserData map[string]any `json:"browserData"`
+}
+
+const subscriptionCookieName = "bag_exchange_subscribed"
+
+func (s *SubscribeController) Subscribe(c fiber.Ctx) error {
+	var req subscribeRequest
+	if err := json.Unmarshal(c.Body(), &req); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(map[string]string{"error": "invalid payload"})
+	}
+
+	email := strings.ToLower(strings.TrimSpace(req.Email))
+	if _, err := mail.ParseAddress(email); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(map[string]string{"error": "invalid email"})
+	}
+
+	emailHash := hashEmail(email)
+	if c.Cookies(subscriptionCookieName) == emailHash {
+		return c.Status(fiber.StatusConflict).JSON(map[string]string{"status": "already_submitted"})
+	}
+
+	browserData := "{}"
+	if len(req.BrowserData) > 0 {
+		payload, err := json.Marshal(req.BrowserData)
+		if err != nil {
+			return c.Status(fiber.StatusBadRequest).JSON(map[string]string{"error": "invalid browser data"})
+		}
+		browserData = string(payload)
+	}
+
+	err := s.DB.Table("subscribers").Create(map[string]any{
+		"email":           email,
+		"ip_address":      c.IP(),
+		"user_agent":      c.Get("User-Agent"),
+		"accept_language": c.Get("Accept-Language"),
+		"browser_data":    browserData,
+	}).Error
+	if err != nil {
+		if s.IsUniqueConstraint != nil && s.IsUniqueConstraint(err) {
+			setSubscriptionCookie(c, emailHash)
+			return c.Status(fiber.StatusConflict).JSON(map[string]string{"status": "already_submitted"})
+		}
+		log.Printf("unable to insert subscriber: %v", err)
+		return c.Status(fiber.StatusInternalServerError).JSON(map[string]string{"error": "unable to save subscription"})
+	}
+
+	setSubscriptionCookie(c, emailHash)
+	return c.Status(fiber.StatusCreated).JSON(map[string]string{"status": "subscribed"})
+}
+
+func hashEmail(email string) string {
+	sum := sha256.Sum256([]byte(strings.ToLower(strings.TrimSpace(email))))
+	return hex.EncodeToString(sum[:])
+}
+
+func setSubscriptionCookie(c fiber.Ctx, value string) {
+	c.Cookie(&fiber.Cookie{
+		Name:     subscriptionCookieName,
+		Value:    value,
+		Path:     "/",
+		HTTPOnly: false,
+		Secure:   false,
+		Expires:  time.Now().AddDate(1, 0, 0),
+		MaxAge:   60 * 60 * 24 * 365,
+	})
+}