Add ACME/Let’s Encrypt integration tests

Thx @gwallet for the help.

integration/acme_test.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"crypto/tls"
+	"net/http"
+	"os"
+	"os/exec"
+	"time"
+
+	"github.com/go-check/check"
+
+	"errors"
+	"github.com/containous/traefik/integration/utils"
+	checker "github.com/vdemeester/shakers"
+)
+
+// ACME test suites (using libcompose)
+type AcmeSuite struct {
+	BaseSuite
+}
+
+func (s *AcmeSuite) SetUpSuite(c *check.C) {
+	s.createComposeProject(c, "boulder")
+	s.composeProject.Start(c)
+
+	boulderHost := s.composeProject.Container(c, "boulder").NetworkSettings.IPAddress
+
+	// wait for boulder
+	err := utils.Try(120*time.Second, func() error {
+		resp, err := http.Get("http://" + boulderHost + ":4000/directory")
+		if err != nil {
+			return err
+		}
+		if resp.StatusCode != 200 {
+			return errors.New("Expected http 200 from boulder")
+		}
+		return nil
+	})
+
+	c.Assert(err, checker.IsNil)
+}
+
+func (s *AcmeSuite) TearDownSuite(c *check.C) {
+	// shutdown and delete compose project
+	if s.composeProject != nil {
+		s.composeProject.Stop(c)
+	}
+}
+
+func (s *AcmeSuite) TestRetrieveAcmeCertificate(c *check.C) {
+	boulderHost := s.composeProject.Container(c, "boulder").NetworkSettings.IPAddress
+	file := s.adaptFile(c, "fixtures/acme/acme.toml", struct{ BoulderHost string }{boulderHost})
+	defer os.Remove(file)
+	cmd := exec.Command(traefikBinary, "--configFile="+file)
+	err := cmd.Start()
+	c.Assert(err, checker.IsNil)
+	defer cmd.Process.Kill()
+
+	backend := startTestServer("9010", 200)
+	defer backend.Close()
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+	}
+	client := &http.Client{Transport: tr}
+
+	// wait for traefik (generating acme account take some seconds)
+	err = utils.Try(30*time.Second, func() error {
+		_, err := client.Get("https://127.0.0.1:5001")
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+	c.Assert(err, checker.IsNil)
+
+	tr = &http.Transport{
+		TLSClientConfig: &tls.Config{
+			InsecureSkipVerify: true,
+			ServerName:         "traefik.acme.wtf",
+		},
+	}
+	client = &http.Client{Transport: tr}
+	req, _ := http.NewRequest("GET", "https://127.0.0.1:5001/", nil)
+	req.Host = "traefik.acme.wtf"
+	req.Header.Set("Host", "traefik.acme.wtf")
+	req.Header.Set("Accept", "*/*")
+	resp, err := client.Do(req)
+	c.Assert(err, checker.IsNil)
+	// Expected a 200
+	c.Assert(resp.StatusCode, checker.Equals, 200)
+}