MOBILE-2788 ws: Save permission errors to the cache

scripts/langindex.json

@@ -1517,6 +1517,7 @@
   "core.nograde": "moodle",
   "core.none": "moodle",
   "core.nopasswordchangeforced": "local_moodlemobileapp",
+  "core.nopermissionerror": "local_moodlemobileapp",
   "core.nopermissions": "error",
   "core.noresults": "moodle",
   "core.notapplicable": "local_moodlemobileapp",

src/assets/lang/en.json

@@ -1518,6 +1518,7 @@
     "core.nograde": "No grade",
     "core.none": "None",
     "core.nopasswordchangeforced": "You cannot proceed without changing your password.",
+    "core.nopermissionerror": "Sorry, but you do not currently have permissions to do that",
     "core.nopermissions": "Sorry, but you do not currently have permissions to do that ({{$a}})",
     "core.noresults": "No results",
     "core.notapplicable": "n/a",

src/classes/site.ts

@@ -671,6 +671,16 @@ export class CoreSite {
                     // This should not happen.
                     error.message = this.translate.instant('core.unicodenotsupported');
 
+                    return Promise.reject(error);
+                } else if (error.exception === 'required_capability_exception' || error.errorcode === 'nopermission') {
+                    if (error.message === 'error/nopermission') {
+                        // This error message is returned by some web services but the string does not exist.
+                        error.message = this.translate.instant('core.nopermissionerror');
+                    }
+
+                    // Save the error instead of deleting the cache entry so the same content is displayed in offline.
+                    this.saveToCache(method, data, error, preSets);
+
                     return Promise.reject(error);
                 } else if (typeof preSets.emergencyCache !== 'undefined' && !preSets.emergencyCache) {
                     this.logger.debug(`WS call '${method}' failed. Emergency cache is forbidden, rejecting.`);
@@ -695,6 +705,13 @@ export class CoreSite {
                     return Promise.reject(error);
                 });
             });
+        }).then((response) => {
+            // Check if the response is an error, this happens if the error was stored in the cache.
+            if (response && typeof response.exception !== 'undefined') {
+                return Promise.reject(response);
+            }
+
+            return response;
         });
     }
 

src/lang/en.json

@@ -163,6 +163,7 @@
     "nograde": "No grade",
     "none": "None",
     "nopasswordchangeforced": "You cannot proceed without changing your password.",
+    "nopermissionerror": "Sorry, but you do not currently have permissions to do that",
     "nopermissions": "Sorry, but you do not currently have permissions to do that ({{$a}})",
     "noresults": "No results",
     "notapplicable": "n/a",