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package middleware
import (
"net"
"github.com/labstack/echo/v4"
)
func NewIPFilter(allowedRanges []*net.IPNet) echo.MiddlewareFunc {
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
if allowedRanges == nil {
c.Logger().Error("No allowed IPs configured for filter")
return echo.ErrNotFound
}
ip := net.ParseIP(c.RealIP())
if ip == nil {
c.Logger().Error("Unable to parse IP in IPFilter")
return echo.ErrNotFound
}
found := false
for _, ipnet := range allowedRanges {
if ipnet.Contains(ip) {
found = true
break
}
}
if !found {
c.Logger().Errorf("IP %s not in range for filter", c.RealIP())
return echo.ErrNotFound
}
return next(c)
}
}
}
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