OAuth info stuff (#849)

* OAuth info stuff

* fix docs

* oops

src/client/Client.js

@@ -324,6 +324,15 @@ class Client extends EventEmitter {
     return messages;
   }
 
+  /**
+   * Get's the bot's OAuth2 app. Only usable by bot accounts
+   * @returns {Promise<ClientOAuth2App>}
+   */
+  getMyApp() {
+    if (!this.user.bot) throw new Error(Constants.Errors.NO_BOT_ACCOUNT);
+    return this.rest.methods.getMyApp();
+  }
+
   setTimeout(fn, ...params) {
     const timeout = setTimeout(() => {
       fn();

src/client/rest/RESTMethods.js

@@ -10,6 +10,7 @@ const Role = requireStructure('Role');
 const Invite = requireStructure('Invite');
 const Webhook = requireStructure('Webhook');
 const UserProfile = requireStructure('UserProfile');
+const ClientOAuth2App = requireStructure('ClientOAuth2App');
 
 class RESTMethods {
   constructor(restManager) {
@@ -762,6 +763,14 @@ class RESTMethods {
         .then(resolve, reject);
     });
   }
+
+  getMyApp() {
+    return new Promise((resolve, reject) => {
+      this.rest.makeRequest('get', Constants.Endpoints.myApp, true)
+        .then(app => resolve(new ClientOAuth2App(this.rest.client, app)))
+        .catch(reject);
+    });
+  }
 }
 
 module.exports = RESTMethods;