chore: git cache cleanup

backend/internal/api/handlers/system_handler.go

@@ -0,0 +1,75 @@
+package handlers
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+type SystemHandler struct{}
+
+func NewSystemHandler() *SystemHandler {
+	return &SystemHandler{}
+}
+
+type MyIPResponse struct {
+	IP     string `json:"ip"`
+	Source string `json:"source"`
+}
+
+// GetMyIP returns the client's public IP address
+func (h *SystemHandler) GetMyIP(c *gin.Context) {
+	// Try to get the real IP from various headers (in order of preference)
+	// This handles proxies, load balancers, and CDNs
+	ip := getClientIP(c.Request)
+
+	source := "direct"
+	switch {
+	case c.GetHeader("X-Forwarded-For") != "":
+		source = "X-Forwarded-For"
+	case c.GetHeader("X-Real-IP") != "":
+		source = "X-Real-IP"
+	case c.GetHeader("CF-Connecting-IP") != "":
+		source = "Cloudflare"
+	}
+
+	c.JSON(http.StatusOK, MyIPResponse{
+		IP:     ip,
+		Source: source,
+	})
+}
+
+// getClientIP extracts the real client IP from the request
+// Checks headers in order of trust/reliability
+func getClientIP(r *http.Request) string {
+	// Cloudflare
+	if ip := r.Header.Get("CF-Connecting-IP"); ip != "" {
+		return ip
+	}
+
+	// Other CDNs/proxies
+	if ip := r.Header.Get("X-Real-IP"); ip != "" {
+		return ip
+	}
+
+	// Standard proxy header (can be a comma-separated list)
+	if forwarded := r.Header.Get("X-Forwarded-For"); forwarded != "" {
+		// Take the first IP in the list (client IP)
+		ips := strings.Split(forwarded, ",")
+		if len(ips) > 0 {
+			return strings.TrimSpace(ips[0])
+		}
+	}
+
+	// Fallback to RemoteAddr (format: "IP:port")
+	if ip := r.RemoteAddr; ip != "" {
+		// Remove port if present
+		if idx := strings.LastIndex(ip, ":"); idx != -1 {
+			return ip[:idx]
+		}
+		return ip
+	}
+
+	return "unknown"
+}