feat(server): Add URL utils to compute server URL, HOST, PORT, etc.

server/utils/url-utils.js

@@ -0,0 +1,37 @@
+const isDev = process.env.NODE_ENV !== 'production';
+const isBeta = !!process.env.BETA;
+
+export function getEmailSender() {
+  return process.env.EMAIL_SENDER || 'team@freecodecamp.com';
+}
+
+export function getPort() {
+  if (!isDev) {
+    return '443';
+  }
+  return process.env.SYNC_PORT || '3000';
+}
+
+export function getProtocol() {
+  return isDev ? 'http' : 'https';
+}
+
+export function getHost() {
+  if (isDev) {
+    return process.env.HOST || 'localhost';
+  }
+  return isBeta ? 'beta.freecodecamp.com' : 'freecodecamp.com';
+}
+
+export function getServerFullURL() {
+  if (!isDev) {
+   return getProtocol()
+        + '://'
+        + getHost();
+  }
+  return getProtocol()
+       + '://'
+       + getHost()
+       + ':'
+       + getPort();
+}