Prompt refresh when build UUID changes (#24)

src/app/service/api.service.ts

@@ -10,6 +10,7 @@ import ApiResponse from '../structures/ApiResponse';
 export class ApiService {
   protected baseEndpoint: string = environment.backendBase;
   protected statUrl: string = environment.statUrl;
+  protected versionUrl: string = environment.versionUrl;
 
   constructor(
       protected http: HttpClient,
@@ -31,6 +32,17 @@ export class ApiService {
     return this._request(this.statUrl);
   }
 
+  public version(): Promise<string> {
+    return new Promise((res, rej) => {
+      this._request(this.versionUrl).subscribe({
+        next: result => {
+          res(result.data.text.trim());
+        },
+        error: rej,
+      });
+    });
+  }
+
   protected _request(endpoint, params = {}, method: 'get'|'post' = 'get'): Observable<ApiResponse> {
     return new Observable<ApiResponse>(sub => {
       let data: any = {}

src/app/service/session.service.ts

@@ -11,6 +11,7 @@ export class SessionService {
     protected data: any = {};
     protected saveTriggered = false;
     protected saving = false;
+    protected loadedVersion = '';
     protected privTriggerSave = debounce(() => {
         if ( this.saving ) {
             this.triggerSave();
@@ -26,11 +27,21 @@ export class SessionService {
         this.privTriggerSave();
     }
 
+    public get version() {
+        return this.loadedVersion;
+    }
+
     constructor(
         protected readonly api: ApiService,
     ) { }
 
+    async newVersionAvailable() {
+        return (await this.api.version()) !== this.loadedVersion;
+    }
+
     async stat() {
+        this.loadedVersion = await this.api.version();
+
         return new Promise((res, rej) => {
             this.api.stat().subscribe(response => {
                 res(response.data);