Refactor existing code to add the configured domain to connect-src

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

lib/config/buildDomainOriginWithProtocol.js

@@ -0,0 +1,19 @@
+module.exports = {
+  buildDomainOriginWithProtocol: function (config, baseProtocol) {
+    const isStandardHTTPsPort = config.protocolUseSSL && config.port === 443
+    const isStandardHTTPPort = !config.protocolUseSSL && config.port === 80
+
+    if (!config.domain) {
+      return ''
+    }
+    let origin = ''
+    const protocol = baseProtocol + (config.protocolUseSSL ? 's' : '') + '://'
+    origin = protocol + config.domain
+    if (config.urlAddPort) {
+      if (!isStandardHTTPPort || !isStandardHTTPsPort) {
+        origin += ':' + config.port
+      }
+    }
+    return origin
+  }
+}