Add a sanity check for useEmulator URL. (#3934)

* Add a sanity check for useEmulator URL. * Create early-elephants-learn.md * Wrap line to keep under 100 chars.
firebase · Oct 13, 2020 · 916770f · 916770f
1 parent 00c963b
commit 916770f
Show file tree

Hide file tree

Showing 2 changed files with 10 additions and 0 deletions.
diff --git a/.changeset/early-elephants-learn.md b/.changeset/early-elephants-learn.md
@@ -0,0 +1,5 @@
+---
+"@firebase/auth": patch
+---
+
+Add a validation for useEmulator URL.
diff --git a/packages/auth/src/auth.js b/packages/auth/src/auth.js
@@ -299,6 +299,11 @@ fireauth.Auth.prototype.useDeviceLanguage = function() {
 fireauth.Auth.prototype.useEmulator = function(url) {
   // Emulator config can only be set once.
   if (!this.emulatorConfig_) {
+    if (!/^https?:\/\//.test(url)) {
+      throw new fireauth.AuthError(
+          fireauth.authenum.Error.ARGUMENT_ERROR,
+          'Emulator URL must start with a valid scheme (http:// or https://).');
+    }
     // Emit a warning so dev knows we are now in test mode.
     this.emitEmulatorWarning_();
     // Persist the config.