Move code to pkg

pkg/middlewares/ipwhitelist/ip_whitelist.go

@@ -0,0 +1,85 @@
+package ipwhitelist
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/containous/traefik/pkg/config"
+	"github.com/containous/traefik/pkg/ip"
+	"github.com/containous/traefik/pkg/middlewares"
+	"github.com/containous/traefik/pkg/tracing"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+const (
+	typeName = "IPWhiteLister"
+)
+
+// ipWhiteLister is a middleware that provides Checks of the Requesting IP against a set of Whitelists
+type ipWhiteLister struct {
+	next        http.Handler
+	whiteLister *ip.Checker
+	strategy    ip.Strategy
+	name        string
+}
+
+// New builds a new IPWhiteLister given a list of CIDR-Strings to whitelist
+func New(ctx context.Context, next http.Handler, config config.IPWhiteList, name string) (http.Handler, error) {
+	logger := middlewares.GetLogger(ctx, name, typeName)
+	logger.Debug("Creating middleware")
+
+	if len(config.SourceRange) == 0 {
+		return nil, errors.New("sourceRange is empty, IPWhiteLister not created")
+	}
+
+	checker, err := ip.NewChecker(config.SourceRange)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse CIDR whitelist %s: %v", config.SourceRange, err)
+	}
+
+	strategy, err := config.IPStrategy.Get()
+	if err != nil {
+		return nil, err
+	}
+
+	logger.Debugf("Setting up IPWhiteLister with sourceRange: %s", config.SourceRange)
+	return &ipWhiteLister{
+		strategy:    strategy,
+		whiteLister: checker,
+		next:        next,
+		name:        name,
+	}, nil
+}
+
+func (wl *ipWhiteLister) GetTracingInformation() (string, ext.SpanKindEnum) {
+	return wl.name, tracing.SpanKindNoneEnum
+}
+
+func (wl *ipWhiteLister) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	logger := middlewares.GetLogger(req.Context(), wl.name, typeName)
+
+	err := wl.whiteLister.IsAuthorized(wl.strategy.GetIP(req))
+	if err != nil {
+		logMessage := fmt.Sprintf("rejecting request %+v: %v", req, err)
+		logger.Debug(logMessage)
+		tracing.SetErrorWithEvent(req, logMessage)
+		reject(logger, rw)
+		return
+	}
+	logger.Debugf("Accept %s: %+v", wl.strategy.GetIP(req), req)
+
+	wl.next.ServeHTTP(rw, req)
+}
+
+func reject(logger logrus.FieldLogger, rw http.ResponseWriter) {
+	statusCode := http.StatusForbidden
+
+	rw.WriteHeader(statusCode)
+	_, err := rw.Write([]byte(http.StatusText(statusCode)))
+	if err != nil {
+		logger.Error(err)
+	}
+}