fix: url parser for openapi v3

packages/hoppscotch-common/src/helpers/import-export/import/openapi.ts

@@ -514,15 +514,30 @@ const parseOpenAPIAuth = (
     ? parseOpenAPIV3Auth(doc as OpenAPIV3.Document | OpenAPIV31.Document, op)
     : parseOpenAPIV2Auth(doc as OpenAPIV2.Document, op)
 
-const parseOpenAPIUrl = (doc: OpenAPI.Document): string => {
-  let url = ""
-  if (objectHasProperty(doc, "host")) {
-    url += doc.host
+const parseOpenAPIUrl = (
+  doc: OpenAPI.Document | OpenAPIV2.Document | OpenAPIV3.Document
+): string => {
+  /**
+   * OpenAPI V2 has version as a string in the document's swagger property.
+   * And host and basePath are in the document's host and basePath properties.
+   * Relevant v2 reference: https://swagger.io/specification/v2/#:~:text=to%20be%20obscured.-,Schema,-Swagger%20Object
+   **/
+
+  if (objectHasProperty(doc, "swagger")) {
+    return `${doc.host}${doc.basePath}`
   }
-  if (objectHasProperty(doc, "basePath")) {
-    url += doc.basePath
+
+  /**
+   * OpenAPI V3 has version as a string in the document's openapi property.
+   * And host and basePath are in the document's servers property.
+   * Relevant v3 reference: https://swagger.io/specification/#server-object
+   **/
+  if (objectHasProperty(doc, "servers")) {
+    return doc.servers?.[0].url ?? ""
   }
-  return url
+
+  // If the document is neither v2 nor v3 then return a env variable as placeholder
+  return "<<baseUrl>>"
 }
 
 const convertPathToHoppReqs = (