feat(common.cookie): allow usage of secrets for header

plugins/common/cookie/cookie.go

@@ -20,7 +20,7 @@ type CookieAuthConfig struct {
 	URL    string `toml:"cookie_auth_url"`
 	Method string `toml:"cookie_auth_method"`
 
-	Headers map[string]string `toml:"cookie_auth_headers"`
+	Headers map[string]*config.Secret `toml:"cookie_auth_headers"`
 
 	// HTTP Basic Auth Credentials
 	Username string `toml:"cookie_auth_username"`
@@ -98,11 +98,19 @@ func (c *CookieAuthConfig) auth() error {
 	}
 
 	for k, v := range c.Headers {
+		secret, err := v.Get()
+		if err != nil {
+			return err
+		}
+
+		headerVal := secret.String()
 		if strings.EqualFold(k, "host") {
-			req.Host = v
+			req.Host = headerVal
 		} else {
-			req.Header.Add(k, v)
+			req.Header.Add(k, headerVal)
 		}
+
+		secret.Destroy()
 	}
 
 	resp, err := c.client.Do(req)

plugins/common/cookie/cookie_test.go

@@ -37,6 +37,8 @@ var fakeCookie = &http.Cookie{
 	Value: "this is an auth cookie",
 }
 
+var reqHeaderValSecret = config.NewSecret([]byte(reqHeaderVal))
+
 type fakeServer struct {
 	*httptest.Server
 	*int32
@@ -123,7 +125,7 @@ func TestAuthConfig_Start(t *testing.T) {
 		Username string
 		Password string
 		Body     string
-		Headers  map[string]string
+		Headers  map[string]*config.Secret
 	}
 	type args struct {
 		renewal  time.Duration
@@ -157,7 +159,7 @@ func TestAuthConfig_Start(t *testing.T) {
 				endpoint: authEndpointWithHeader,
 			},
 			fields: fields{
-				Headers: map[string]string{reqHeaderKey: reqHeaderVal},
+				Headers: map[string]*config.Secret{reqHeaderKey: &reqHeaderValSecret},
 			},
 			firstAuthCount:    1,
 			lastAuthCount:     3,