Backports (#1813)

* Backported OAuth2Application 201ecd25a2

* Backported retry on 500 57b6980313

* Backported b8034525e3 and fa5c4efa2b

src/structures/ClientUserChannelOverride.js

@@ -0,0 +1,28 @@
+const Constants = require('../util/Constants');
+
+/**
+ * A wrapper around the ClientUser's channel overrides.
+ */
+class ClientUserChannelOverride {
+  constructor(data) {
+    this.patch(data);
+  }
+
+  /**
+   * Patch the data contained in this class with new partial data.
+   * @param {Object} data Data to patch this with
+   */
+  patch(data) {
+    for (const key of Object.keys(Constants.UserChannelOverrideMap)) {
+      const value = Constants.UserChannelOverrideMap[key];
+      if (!data.hasOwnProperty(key)) continue;
+      if (typeof value === 'function') {
+        this[value.name] = value(data[key]);
+      } else {
+        this[value] = data[key];
+      }
+    }
+  }
+}
+
+module.exports = ClientUserChannelOverride;