feat: 🎸 Add storage bucket models (#85)

* feat: 🎸 Add storage bucket models

✅ Closes: ICU-8076

addons/api/addon/models/storage-bucket.js

@@ -0,0 +1,57 @@
+import GeneratedStorageBucketModel from '../generated/models/storage-bucket';
+
+export const TYPE_STORAGE_BUCKET_PLUGIN = 'plugin';
+export const TYPES_STORAGE_BUCKET = Object.freeze([TYPE_STORAGE_BUCKET_PLUGIN]);
+
+export const TYPE_STORAGE_BUCKET_PLUGIN_AWS_S3 = 'aws_s3';
+export const TYPES_STORAGE_BUCKET_PLUGIN = Object.freeze([
+  TYPE_STORAGE_BUCKET_PLUGIN_AWS_S3,
+]);
+
+export default class StorageBucketModel extends GeneratedStorageBucketModel {
+  /**
+   * True if the storage bucket is a plugin.
+   * @type {boolean}
+   */
+  get isPlugin() {
+    return this.type === 'plugin';
+  }
+
+  /**
+   * True if the storage bucket is an unknown type.
+   * @type {boolean}
+   */
+  get isUnknown() {
+    return (
+      !TYPES_STORAGE_BUCKET.includes(this.type) ||
+      (this.isPlugin &&
+        !TYPES_STORAGE_BUCKET_PLUGIN.includes(this.plugin?.name))
+    );
+  }
+
+  /**
+   * True if the storage bucket plugin type is AWS.
+   * @type {boolean}
+   */
+  get isAWS() {
+    return this.compositeType === 'aws_s3';
+  }
+
+  /**
+   * If the storage bucket is a plugin return `plugin.name`,
+   * otherwise return the storage bucket type.
+   * @type {string}
+   */
+  get compositeType() {
+    if (this.isUnknown) return 'unknown';
+    return this.plugin.name;
+  }
+
+  /**
+   * Sets `type` to `plugin` and `plugin.name` to the specified type.
+   */
+  set compositeType(type) {
+    this.type = 'plugin';
+    this.plugin = { name: type };
+  }
+}