client: avoid repeating slashes when communicating with the tsuru API

client.go

@@ -51,7 +51,7 @@ func (c Client) registerUnit(appName string, customData TsuruYaml) ([]bind.EnvVa
 	v := url.Values{}
 	v.Set("hostname", hostname)
 	v.Set("customdata", string(yamlData))
-	u := fmt.Sprintf("%s/apps/%s/units/register", c.URL, appName)
+	u := c.url(fmt.Sprintf("/apps/%s/units/register", appName))
 	req, err := http.NewRequest("POST", u, strings.NewReader(v.Encode()))
 	if err != nil {
 		return nil, err
@@ -79,7 +79,7 @@ func (c Client) sendDiffDeploy(diff, appName string) error {
 	var err error
 	v := url.Values{}
 	v.Set("customdata", diff)
-	u := fmt.Sprintf("%s/apps/%s/diff", c.URL, appName)
+	u := c.url(fmt.Sprintf("/apps/%s/diff", appName))
 	req, err := http.NewRequest("POST", u, strings.NewReader(v.Encode()))
 	if err != nil {
 		return err
@@ -100,3 +100,7 @@ func (c Client) sendDiffDeploy(diff, appName string) error {
 	}
 	return nil
 }
+
+func (c Client) url(path string) string {
+	return fmt.Sprintf("%s/%s", strings.TrimRight(c.URL, "/"), strings.TrimLeft(path, "/"))
+}

client_test.go

@@ -97,3 +97,21 @@ func (s *S) TestClientSendDiff(c *check.C) {
 	err = cli.sendDiffDeploy(diff, "test")
 	c.Assert(err, check.IsNil)
 }
+
+func (s *S) TestClientUrl(c *check.C) {
+	var tests = []struct {
+		input    string
+		expected string
+	}{
+		{"/", "http://localhost/"},
+		{"/index", "http://localhost/index"},
+		{"///index", "http://localhost/index"},
+		{"/v1/register", "http://localhost/v1/register"},
+		{"v1/register", "http://localhost/v1/register"},
+	}
+	cli := Client{URL: "http://localhost/", Token: "test-token"}
+	for _, test := range tests {
+		got := cli.url(test.input)
+		c.Check(got, check.Equals, test.expected)
+	}
+}