From fb3cb3627bceb93297eddf3a8ab70f7c4defc990 Mon Sep 17 00:00:00 2001
From: Patrick Niklaus <github@execfoo.de>
Date: Thu, 17 Jan 2019 16:24:05 +0100
Subject: [PATCH] fix: Only display API version if present (#773)

* Only display API version if present
* Warn if `info.version` is omitted, error if `info` is missing.
---
 src/components/ApiInfo/ApiInfo.tsx | 8 +++++++-
 src/services/OpenAPIParser.ts      | 6 ++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/components/ApiInfo/ApiInfo.tsx b/src/components/ApiInfo/ApiInfo.tsx
index e1fcaaea3f..fe595811de 100644
--- a/src/components/ApiInfo/ApiInfo.tsx
+++ b/src/components/ApiInfo/ApiInfo.tsx
@@ -70,12 +70,18 @@ export class ApiInfo extends React.Component<ApiInfoProps> {
       )) ||
       null;
 
+    const version =
+      (info.version && (
+        <span>({info.version})</span>
+      )) ||
+      null;
+
     return (
       <Section>
         <Row>
           <MiddlePanel className="api-info">
             <ApiHeader>
-              {info.title} <span>({info.version})</span>
+              {info.title} {version}
             </ApiHeader>
             {!hideDownloadButton && (
               <p>
diff --git a/src/services/OpenAPIParser.ts b/src/services/OpenAPIParser.ts
index 37a6e13887..335461dad5 100644
--- a/src/services/OpenAPIParser.ts
+++ b/src/services/OpenAPIParser.ts
@@ -63,6 +63,12 @@ export class OpenAPIParser {
     if (spec.openapi === undefined) {
       throw new Error('Document must be valid OpenAPI 3.0.0 definition');
     }
+    if (spec.info === undefined) {
+      throw new Error('OpenAPI 3.0.0 requires an `info` section');
+    }
+    if (spec.info.version === undefined) {
+      console.warn('OpenAPI 3.0.0 requires setting a `info.version` field, ignoring.')
+    }
   }
 
   preprocess(spec: OpenAPISpec) {