Reserved topic stuff

web/src/app/AccountApi.js

@@ -231,6 +231,8 @@ class AccountApi {
         });
         if (response.status === 401 || response.status === 403) {
             throw new UnauthorizedError();
+        } else if (response.status === 409) {
+            throw new TopicReservedError();
         } else if (response.status !== 200) {
             throw new Error(`Unexpected server response ${response.status}`);
         }
@@ -312,6 +314,13 @@ export class UsernameTakenError extends Error {
     }
 }
 
+export class TopicReservedError extends Error {
+    constructor(topic) {
+        super("Topic already reserved");
+        this.topic = topic;
+    }
+}
+
 export class AccountCreateLimitReachedError extends Error {
     constructor() {
         super("Account creation limit reached");

web/src/app/config.js

@@ -1,2 +1,7 @@
 const config = window.config;
+
+if (config.base_url === "") {
+    config.base_url = window.location.origin;
+}
+
 export default config;