MOBILE-2380 offline: Support disabling offline browsing

src/addon/mod/quiz/providers/prefetch-handler.ts

@@ -154,6 +154,11 @@ export class AddonModQuizPrefetchHandler extends CoreCourseModulePrefetchHandler
      * @return {boolean|Promise<boolean>} Whether the module can be downloaded. The promise should never be rejected.
      */
     isDownloadable(module: any, courseId: number): boolean | Promise<boolean> {
+        if (this.sitesProvider.getCurrentSite().isOfflineDisabled()) {
+            // Don't allow downloading the quiz if offline is disabled to prevent wasting a lot of data when opening it.
+            return false;
+        }
+
         const siteId = this.sitesProvider.getCurrentSiteId();
 
         return this.quizProvider.getQuiz(courseId, module.id, false, siteId).then((quiz) => {

src/addon/mod/quiz/providers/quiz.ts

@@ -1492,7 +1492,8 @@ export class AddonModQuizProvider {
      * @return {boolean} Whether offline is enabled.
      */
     isQuizOffline(quiz: any): boolean {
-        return !!quiz.allowofflineattempts;
+        // Don't allow downloading the quiz if offline is disabled to prevent wasting a lot of data when opening it.
+        return !!quiz.allowofflineattempts && !this.sitesProvider.getCurrentSite().isOfflineDisabled();
     }
 
     /**

src/classes/site.ts

@@ -203,6 +203,7 @@ export class CoreSite {
     protected db: SQLiteDB;
     protected cleanUnicode = false;
     protected lastAutoLogin = 0;
+    protected offlineDisabled = false;
 
     /**
      * Create a site.
@@ -234,6 +235,7 @@ export class CoreSite {
         this.wsProvider = injector.get(CoreWSProvider);
 
         this.logger = logger.getInstance('CoreWSProvider');
+        this.calculateOfflineDisabled();
 
         if (this.id) {
             this.initDB();
@@ -376,6 +378,7 @@ export class CoreSite {
     setConfig(config: any): void {
         config.tool_mobile_disabledfeatures = this.textUtils.treatDisabledFeatures(config.tool_mobile_disabledfeatures);
         this.config = config;
+        this.calculateOfflineDisabled();
     }
 
     /**
@@ -530,6 +533,10 @@ export class CoreSite {
         const initialToken = this.token;
         data = data || {};
 
+        if (!this.appProvider.isOnline() && this.offlineDisabled) {
+            return Promise.reject(this.wsProvider.createFakeWSError('core.errorofflinedisabled', true));
+        }
+
         // Check if the method is available, use a prefixed version if possible.
         // We ignore this check when we do not have the site info, as the list of functions is not loaded yet.
         if (this.getInfo() && !this.wsAvailable(method, false)) {
@@ -560,6 +567,13 @@ export class CoreSite {
             wsPreSets.cleanUnicode = false;
         }
 
+        if (this.offlineDisabled) {
+            // Offline is disabled, don't use cache.
+            preSets.getFromCache = false;
+            preSets.saveToCache = false;
+            preSets.emergencyCache = false;
+        }
+
         // Enable text filtering by default.
         data.moodlewssettingfilter = preSets.filter === false ? false : true;
         data.moodlewssettingfileurl = preSets.rewriteurls === false ? false : true;
@@ -1351,6 +1365,22 @@ export class CoreSite {
         return !!disabledFeatures.match(regEx);
     }
 
+    /**
+     * Calculate if offline is disabled in the site.
+     */
+    calculateOfflineDisabled(): void {
+        this.offlineDisabled = this.isFeatureDisabled('NoDelegate_CoreOffline');
+    }
+
+    /**
+     * Get whether offline is disabled in the site.
+     *
+     * @return {boolean} Whether it's disabled.
+     */
+    isOfflineDisabled(): boolean {
+        return this.offlineDisabled;
+    }
+
     /**
      * Check if the site version is greater than one or several versions.
      * This function accepts a string or an array of strings. If array, the last version must be the highest.

src/lang/en.json

@@ -77,6 +77,7 @@
     "errorinvalidform": "The form contains invalid data. Please make sure to fill all required fields and that the data is valid.",
     "errorinvalidresponse": "Invalid response received. Please contact your Moodle site administrator if the error persists.",
     "errorloadingcontent": "Error loading content.",
+    "errorofflinedisabled": "Offline browsing is disabled on your site. You need to be connected to the internet to use the app.",
     "erroropenfilenoapp": "Error opening the file: no app found to open this kind of file.",
     "erroropenfilenoextension": "Error opening the file: the file doesn't have extension.",
     "erroropenpopup": "This activity is trying to open a popup. This is not supported in this app.",