TestAWSIngress: Use LetsEncrypt Staging Root PEM

This commit fixes the test to use LetsEncrypt Staging Root PEM in the
http client.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

test/ingress/aws/aws_test.go

@@ -18,6 +18,8 @@
 package aws
 
 import (
+	"crypto/tls"
+	"crypto/x509"
 	"fmt"
 	"net/http"
 	"testing"
@@ -43,8 +45,10 @@ func TestAWSIngress(t *testing.T) {
 
 	h := i.Spec.Rules[0].Host
 
+	httpsClient := getHTTPClient()
+
 	err = retryutil.Retry(retryIntervalSeconds*time.Second, maxRetries, func() (bool, error) {
-		resp, err := http.Get(fmt.Sprintf("https://%s/get", h))
+		resp, err := httpsClient.Get(fmt.Sprintf("https://%s/get", h))
 		if err != nil {
 			t.Logf("got an HTTP error: %v", err)
 			return false, nil
@@ -67,3 +71,51 @@ func TestAWSIngress(t *testing.T) {
 		t.Fatal("could not get a successful HTTP response in time")
 	}
 }
+
+// getHTTPClient creates a HTTP client with LetsEncrypt Staging Root PEM certificate.
+func getHTTPClient() *http.Client {
+	// Get this Root PEM from https://letsencrypt.org/docs/staging-environment/#root-certificate
+	letsEncryptStagingRootPEM := `-----BEGIN CERTIFICATE-----
+MIIFATCCAumgAwIBAgIRAKc9ZKBASymy5TLOEp57N98wDQYJKoZIhvcNAQELBQAw
+GjEYMBYGA1UEAwwPRmFrZSBMRSBSb290IFgxMB4XDTE2MDMyMzIyNTM0NloXDTM2
+MDMyMzIyNTM0NlowGjEYMBYGA1UEAwwPRmFrZSBMRSBSb290IFgxMIICIjANBgkq
+hkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA+pYHvQw5iU3v2b3iNuYNKYgsWD6KU7aJ
+diddtZQxSWYzUI3U0I1UsRPTxnhTifs/M9NW4ZlV13ZfB7APwC8oqKOIiwo7IwlP
+xg0VKgyz+kT8RJfYr66PPIYP0fpTeu42LpMJ+CKo9sbpgVNDZN2z/qiXrRNX/VtG
+TkPV7a44fZ5bHHVruAxvDnylpQxJobtCBWlJSsbIRGFHMc2z88eUz9NmIOWUKGGj
+EmP76x8OfRHpIpuxRSCjn0+i9+hR2siIOpcMOGd+40uVJxbRRP5ZXnUFa2fF5FWd
+O0u0RPI8HON0ovhrwPJY+4eWKkQzyC611oLPYGQ4EbifRsTsCxUZqyUuStGyp8oa
+aoSKfF6X0+KzGgwwnrjRTUpIl19A92KR0Noo6h622OX+4sZiO/JQdkuX5w/HupK0
+A0M0WSMCvU6GOhjGotmh2VTEJwHHY4+TUk0iQYRtv1crONklyZoAQPD76hCrC8Cr
+IbgsZLfTMC8TWUoMbyUDgvgYkHKMoPm0VGVVuwpRKJxv7+2wXO+pivrrUl2Q9fPe
+Kk055nJLMV9yPUdig8othUKrRfSxli946AEV1eEOhxddfEwBE3Lt2xn0hhiIedbb
+Ftf/5kEWFZkXyUmMJK8Ra76Kus2ABueUVEcZ48hrRr1Hf1N9n59VbTUaXgeiZA50
+qXf2bymE6F8CAwEAAaNCMEAwDgYDVR0PAQH/BAQDAgEGMA8GA1UdEwEB/wQFMAMB
+Af8wHQYDVR0OBBYEFMEmdKSKRKDm+iAo2FwjmkWIGHngMA0GCSqGSIb3DQEBCwUA
+A4ICAQBCPw74M9X/Xx04K1VAES3ypgQYH5bf9FXVDrwhRFSVckria/7dMzoF5wln
+uq9NGsjkkkDg17AohcQdr8alH4LvPdxpKr3BjpvEcmbqF8xH+MbbeUEnmbSfLI8H
+sefuhXF9AF/9iYvpVNC8FmJ0OhiVv13VgMQw0CRKkbtjZBf8xaEhq/YqxWVsgOjm
+dm5CAQ2X0aX7502x8wYRgMnZhA5goC1zVWBVAi8yhhmlhhoDUfg17cXkmaJC5pDd
+oenZ9NVhW8eDb03MFCrWNvIh89DDeCGWuWfDltDq0n3owyL0IeSn7RfpSclpxVmV
+/53jkYjwIgxIG7Gsv0LKMbsf6QdBcTjhvfZyMIpBRkTe3zuHd2feKzY9lEkbRvRQ
+zbh4Ps5YBnG6CKJPTbe2hfi3nhnw/MyEmF3zb0hzvLWNrR9XW3ibb2oL3424XOwc
+VjrTSCLzO9Rv6s5wi03qoWvKAQQAElqTYRHhynJ3w6wuvKYF5zcZF3MDnrVGLbh1
+Q9ePRFBCiXOQ6wPLoUhrrbZ8LpFUFYDXHMtYM7P9sc9IAWoONXREJaO08zgFtMp4
+8iyIYUyQAbsvx8oD2M8kRvrIRSrRJSl6L957b4AFiLIQ/GgV2curs0jje7Edx34c
+idWw1VrejtwclobqNMVtG3EiPUIpJGpbMcJgbiLSmKkrvQtGng==
+-----END CERTIFICATE-----`
+
+	rootCAs := x509.NewCertPool()
+	if ok := rootCAs.AppendCertsFromPEM([]byte(letsEncryptStagingRootPEM)); !ok {
+		// This should fail in the developer testing itself.
+		panic("Failed to parse root certificate")
+	}
+
+	return &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				RootCAs: rootCAs,
+			},
+		},
+	}
+}