TUN-1550: Add validation timeout for non-responsive origins

validation/validation.go

@@ -5,6 +5,7 @@ import (
 	"net"
 	"net/url"
 	"strings"
+	"time"
 
 	"net/http"
 
@@ -14,7 +15,10 @@ import (
 
 const defaultScheme = "http"
 
-var supportedProtocol = [2]string{"http", "https"}
+var (
+	supportedProtocol = [2]string{"http", "https"}
+	validationTimeout = time.Duration(30 * time.Second)
+)
 
 func ValidateHostname(hostname string) (string, error) {
 	if hostname == "" {
@@ -149,6 +153,7 @@ func ValidateHTTPService(originURL string, hostname string, transport http.Round
 		CheckRedirect: func(req *http.Request, via []*http.Request) error {
 			return http.ErrUseLastResponse
 		},
+		Timeout: validationTimeout,
 	}
 
 	initialRequest, err := http.NewRequest("GET", parsedURL.String(), nil)

validation/validation_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"testing"
+	"time"
 
 	"context"
 	"crypto/tls"
@@ -383,6 +384,36 @@ func TestValidateHTTPService_HTTP2HTTPS(t *testing.T) {
 	assert.Error(t, ValidateHTTPService(originURL, hostname, redirectClient.Transport))
 }
 
+// error path 3: origin URL is nonresponsive
+func TestValidateHTTPService_NonResponsiveOrigin(t *testing.T) {
+	originURL := "https://127.0.0.1/"
+	hostname := "example.com"
+	oldValidationTimeout := validationTimeout
+	defer func() {
+		validationTimeout = oldValidationTimeout
+	}()
+	validationTimeout = 500 * time.Millisecond
+
+	server, client, err := createSecureMockServerAndClient(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == "CONNECT" {
+			assert.Equal(t, "127.0.0.1:443", r.Host)
+		} else {
+			assert.Equal(t, hostname, r.Host)
+		}
+		time.Sleep(1 * time.Second)
+		w.WriteHeader(200)
+	}))
+	if !assert.NoError(t, err) {
+		t.FailNow()
+	}
+	defer server.Close()
+
+	err = ValidateHTTPService(originURL, hostname, client.Transport)
+	if err, ok := err.(net.Error); assert.True(t, ok) {
+		assert.True(t, err.Timeout())
+	}
+}
+
 type testRoundTripper func(req *http.Request) (*http.Response, error)
 
 func (f testRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {