web: fix missing source create button

web/src/api/Sources.ts

@@ -1,4 +1,5 @@
 import { BaseInheritanceModel, DefaultClient, AKResponse, QueryArguments } from "./Client";
+import { TypeCreate } from "./Providers";
 
 export class Source implements BaseInheritanceModel {
     pk: string;
@@ -23,6 +24,10 @@ export class Source implements BaseInheritanceModel {
         return DefaultClient.fetch<AKResponse<Source>>(["sources", "all"], filter);
     }
 
+    static getTypes(): Promise<TypeCreate[]> {
+        return DefaultClient.fetch<TypeCreate[]>(["sources", "all", "types"]);
+    }
+
     static adminUrl(rest: string): string {
         return `/administration/sources/${rest}`;
     }