Added method cvat.server.authorized() (#641)

* Added method cvat.server.authorized()
* Typos

cvat-core/src/api-implementation.js

@@ -58,6 +58,11 @@
             await serverProxy.server.logout();
         };
 
+        cvat.server.authorized.implementation = async () => {
+            const result = await serverProxy.server.authorized();
+            return result;
+        };
+
         cvat.users.get.implementation = async (filter) => {
             checkFilter(filter, {
                 self: isBoolean,

cvat-core/src/api.js

@@ -144,6 +144,20 @@ function build() {
                     .apiWrapper(cvat.server.logout);
                 return result;
             },
+            /**
+                * Method allows to know whether you are authorized on the server
+                * @method authorized
+                * @async
+                * @memberof module:API.cvat.server
+                * @returns {boolean}
+                * @throws {module:API.cvat.exceptions.PluginError}
+                * @throws {module:API.cvat.exceptions.ServerError}
+            */
+            async authorized() {
+                const result = await PluginRegistry
+                    .apiWrapper(cvat.server.authorized);
+                return result;
+            },
         },
         /**
             * Namespace is used for getting tasks

cvat-core/src/server-proxy.js

@@ -222,6 +222,20 @@
                 }
             }
 
+            async function authorized() {
+                try {
+                    await module.exports.users.getSelf();
+                } catch (serverError) {
+                    if (serverError.code === 403) {
+                        return false;
+                    }
+
+                    throw serverError;
+                }
+
+                return true;
+            }
+
             async function getTasks(filter = '') {
                 const { backendAPI } = config;
 
@@ -441,7 +455,7 @@
                 } catch (errorData) {
                     const code = errorData.response ? errorData.response.status : errorData.code;
                     throw new ServerError(
-                        'Could not get users from the server',
+                        'Could not get user data from the server',
                         code,
                     );
                 }
@@ -626,6 +640,7 @@
                         exception,
                         login,
                         logout,
+                        authorized,
                     }),
                     writable: false,
                 },