Added new setup endpoint

services/setup.js

@@ -9,6 +9,39 @@ const errors = require('../errors');
  */
 module.exports = class SetupService {
 
+  /**
+   * This returns a promise which resolves if the setup is available.
+   */
+  static isAvailable() {
+
+    // Check if we have an install lock present.
+    if (process.env.TALK_INSTALL_LOCK === 'TRUE') {
+      return Promise.reject(errors.ErrInstallLock);
+    }
+
+    // Get the current settings, we are expecing an error here.
+    return SettingsService
+      .retrieve()
+      .then(() => {
+
+        // We should NOT have gotten a settings object, this means that the
+        // application is already setup. Error out here.
+        return Promise.reject(errors.ErrSettingsInit);
+
+      })
+      .catch((err) => {
+
+        // If the error is `not init`, then we're good, otherwise, it's something
+        // else.
+        if (err !== errors.ErrSettingsNotInit) {
+          return Promise.reject(err);
+        }
+
+        // Allow the request to keep going here.
+        return;
+      });
+  }
+
   /**
    * This verifies that the current input for the setup is valid.
    */