Add option repository

frontend/repositories/option/api.ts

@@ -0,0 +1,21 @@
+import { OptionItem } from '@/models/option'
+import { OptionRepository } from './interface'
+
+export class LocalStorageOptionRepository implements OptionRepository {
+
+  findById(projectId: string): OptionItem {
+    const checkpoint = this.loadCheckpoint()
+    return OptionItem.valueOf(checkpoint[projectId] ? checkpoint[projectId] : { page: 1 })
+  }
+
+  save(projectId: string, option: OptionItem): void {
+    const checkpoint = this.loadCheckpoint()
+    checkpoint[projectId] = option.toObject()
+    localStorage.setItem('checkpoint', JSON.stringify(checkpoint))
+  }
+
+  loadCheckpoint() {
+    const item = localStorage.getItem('checkpoint') || '{}'
+    return JSON.parse(item)
+  }
+}

frontend/repositories/option/interface.ts

@@ -0,0 +1,7 @@
+import { OptionItem } from '@/models/option'
+
+export interface OptionRepository {
+  findById(projectId: string): OptionItem
+
+  save(projectId: string, option: OptionItem): void
+}