diff --git a/src/config.ts b/src/config.ts
index e0ae782..40cff0a 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,6 +1,5 @@
 import { ISettings, Product } from './interfaces/ISettings';
-
-const allowedProducts: Product[] = ['assets_swtor_de_de', 'assets_swtor_en_us', 'assets_swtor_fr_fr', 'assets_swtor_main', 'assets_swtor_test_de_de', 'assets_swtor_test_en_us', 'assets_swtor_test_fr_fr', 'assets_swtor_test_main', 'eualas', 'movies_de_de', 'movies_en_us', 'movies_fr_fr', 'patcher2014', 'patcher2017', 'retailclient_betatest', 'retailclient_cstraining', 'retailclient_liveeptest', 'retailclient_publictest', 'retailclient_squadron157', 'retailclient_swtor'];
+import verifyProductName from './verifyProductName';
 
 const settings: ISettings = {};
 
@@ -10,7 +9,7 @@ export const set = (key: string, value: any) => {
     case 'product':
       //TODO: need to verify input (one of allowed products)
       if (typeof value !== 'string') { throw new Error(`product must be a string but it's a "${typeof value}".`); }
-      if (!allowedProducts.includes(value as Product)) { throw new Error(`"${value}" is not an allowed product.`); }
+      if (!verifyProductName(value)) { throw new Error(`"${value}" is not an allowed product.`); }
       settings.product = value as Product;
       break;
     case 'release':
diff --git a/src/getFileContents.ts b/src/getFileContents.ts
index 5b10f56..f650113 100644
--- a/src/getFileContents.ts
+++ b/src/getFileContents.ts
@@ -1,8 +1,14 @@
 import * as http from 'http';
 import { Product } from './interfaces/ISettings';
+import verifyProductName from './verifyProductName';
 
-export default function getFileContents(product: string = 'assets_swtor_de_de', from: number, to: number): Promise<Buffer> {
+export default function getFileContents(product: Product, from: number, to: number): Promise<Buffer> {
   return new Promise((resolve, reject) => {
+    if (!verifyProductName(product)) {
+      return reject(`"${product}" is not a valid product.`);
+    }
+    //TODO: also verify from and to
+
     //Generate URL
     const path = `/patch/${product}/${product}_${from}to${to}.solidpkg`;
 
diff --git a/src/verifyProductName.ts b/src/verifyProductName.ts
new file mode 100644
index 0000000..969478f
--- /dev/null
+++ b/src/verifyProductName.ts
@@ -0,0 +1,7 @@
+import { Product } from './interfaces/ISettings';
+
+const allowedProducts: Product[] = ['assets_swtor_de_de', 'assets_swtor_en_us', 'assets_swtor_fr_fr', 'assets_swtor_main', 'assets_swtor_test_de_de', 'assets_swtor_test_en_us', 'assets_swtor_test_fr_fr', 'assets_swtor_test_main', 'eualas', 'movies_de_de', 'movies_en_us', 'movies_fr_fr', 'patcher2014', 'patcher2017', 'retailclient_betatest', 'retailclient_cstraining', 'retailclient_liveeptest', 'retailclient_publictest', 'retailclient_squadron157', 'retailclient_swtor'];
+
+export default function verifyProductName(name: string) {
+  return allowedProducts.includes(name as Product);
+}