From 0c8a99f6bc7101f04da966e7058643e1633d7a91 Mon Sep 17 00:00:00 2001
From: itowlson <itowlson@microsoft.com>
Date: Thu, 16 Sep 2021 08:58:05 +1200
Subject: [PATCH] Fix trying to use localhost on bad Hippo URL (#69)

---
 ts/generators/app/providers/hippo.ts |  2 ++
 ts/generators/app/utils/url.ts       | 15 +++++++++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 ts/generators/app/utils/url.ts

diff --git a/ts/generators/app/providers/hippo.ts b/ts/generators/app/providers/hippo.ts
index 16ac884..e459d25 100644
--- a/ts/generators/app/providers/hippo.ts
+++ b/ts/generators/app/providers/hippo.ts
@@ -5,6 +5,7 @@ import { HippoClient } from "hippo-js";
 
 import { Registry } from "./registry";
 import { Formatter } from '../formatter';
+import { validateUrl } from '../utils/url';
 
 export const hippo: Registry = {
   prompts() {
@@ -113,6 +114,7 @@ export const hippo: Registry = {
 
     try {
       const { hippoUrl, hippoUsername, hippoPassword } = answers;
+      validateUrl(hippoUrl);
       const agent = new https.Agent({ rejectUnauthorized: false });
       const client = await withErrorContext("Login failed", () =>
         HippoClient.new(hippoUrl, hippoUsername, hippoPassword, agent)
diff --git a/ts/generators/app/utils/url.ts b/ts/generators/app/utils/url.ts
new file mode 100644
index 0000000..33a0841
--- /dev/null
+++ b/ts/generators/app/utils/url.ts
@@ -0,0 +1,15 @@
+import { URL } from 'url';
+
+export function validateUrl(candidate: string) {
+  try {
+    const url = new URL(candidate);
+    if (url.protocol === 'http:' || url.protocol === 'https:') {
+      return;
+    }
+  } catch (e) {
+    if (e instanceof TypeError) {
+      throw new Error(e.message);
+    }
+  }
+  throw new Error(`Invalid URL ${candidate}: protocol must be http: or https:`);
+}