Refactor OAuth application stuff

src/structures/OAuth2Application.js

@@ -0,0 +1,81 @@
+/**
+ * Represents an OAuth2 Application
+ */
+class OAuth2Application {
+  constructor(client, data) {
+    /**
+     * The client that instantiated the application
+     * @type {Client}
+     */
+    this.client = client;
+    Object.defineProperty(this, 'client', { enumerable: false, configurable: false });
+
+    this.setup(data);
+  }
+
+  setup(data) {
+    /**
+     * The ID of the app
+     * @type {string}
+     */
+    this.id = data.id;
+
+    /**
+     * The name of the app
+     * @type {string}
+     */
+    this.name = data.name;
+
+    /**
+     * The app's description
+     * @type {string}
+     */
+    this.description = data.description;
+
+    /**
+     * The app's icon hash
+     * @type {string}
+     */
+    this.icon = data.icon;
+
+    /**
+     * The app's icon URL
+     * @type {string}
+     */
+    this.iconURL = `https://cdn.discordapp.com/app-icons/${this.id}/${this.icon}.jpg`;
+
+    /**
+     * The app's RPC origins
+     * @type {Array<String>}
+     */
+    this.rpcOrigins = data.rpc_origins;
+  }
+
+  /**
+   * The timestamp the app was created at
+   * @type {number}
+   * @readonly
+   */
+  get createdTimestamp() {
+    return (this.id / 4194304) + 1420070400000;
+  }
+
+  /**
+   * The time the app was created
+   * @type {Date}
+   * @readonly
+   */
+  get createdAt() {
+    return new Date(this.createdTimestamp);
+  }
+
+  /**
+   * When concatenated with a string, this automatically concatenates the app name rather than the app object.
+   * @returns {string}
+   */
+  toString() {
+    return this.name;
+  }
+}
+
+module.exports = OAuth2Application;