Add geo IP checking

backend/controller/geoip.go

@@ -0,0 +1,34 @@
+package controller
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/phishingclub/phishingclub/geoip"
+)
+
+// GeoIP is a controller for GeoIP-related endpoints
+type GeoIP struct {
+	Common
+}
+
+// GetMetadata returns the GeoIP metadata including available country codes
+func (c *GeoIP) GetMetadata(g *gin.Context) {
+	_, _, ok := c.handleSession(g)
+	if !ok {
+		return
+	}
+
+	// get geoip instance
+	geo, err := geoip.Instance()
+	if ok := c.handleErrors(g, err); !ok {
+		return
+	}
+
+	// get metadata
+	metadata := geo.GetMetadata()
+	if metadata == nil {
+		c.Response.BadRequest(g)
+		return
+	}
+
+	c.Response.OK(g, metadata)
+}