524 lines
13 KiB
Markdown
524 lines
13 KiB
Markdown
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---
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name: api-design
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description: REST API 設計模式,包含資源命名、狀態碼、分頁、篩選、錯誤回應、版本控制以及生產環境 API 的速率限制。
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origin: ECC
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---
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# API 設計模式 (API Design Patterns)
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設計一致且對開發者友好的 REST API 的慣例與最佳實踐。
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## 何時啟用
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- 設計新的 API 端點 (Endpoints)
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- 評估現有的 API 合約
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- 新增分頁、篩選或排序功能
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- 為 API 實作錯誤處理
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- 規劃 API 版本控制策略
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- 構建面向公眾或合作夥伴的 API
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## 資源設計 (Resource Design)
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### URL 結構
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```
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# 資源應使用名詞、複數、小寫、kebab-case
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GET /api/v1/users
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GET /api/v1/users/:id
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POST /api/v1/users
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PUT /api/v1/users/:id
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PATCH /api/v1/users/:id
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DELETE /api/v1/users/:id
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# 用於關聯的子資源
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GET /api/v1/users/:id/orders
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POST /api/v1/users/:id/orders
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# 無法對應到 CRUD 的動作 (謹慎使用動詞)
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POST /api/v1/orders/:id/cancel
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POST /api/v1/auth/login
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POST /api/v1/auth/refresh
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```
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### 命名規則
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```
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# 推薦 (GOOD)
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/api/v1/team-members # 多單字資源使用 kebab-case
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/api/v1/orders?status=active # 使用查詢參數進行篩選
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/api/v1/users/123/orders # 使用巢狀資源表示歸屬關係
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# 不推薦 (BAD)
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/api/v1/getUsers # URL 中包含動詞
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/api/v1/user # 使用單數 (應使用複數)
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/api/v1/team_members # URL 中使用 snake_case
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/api/v1/users/123/getOrders # 巢狀資源中包含動詞
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```
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## HTTP 方法與狀態碼
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### 方法語意 (Method Semantics)
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| 方法 | 冪等性 (Idempotent) | 安全性 (Safe) | 用途 |
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|--------|-----------|------|---------|
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| GET | 是 | 是 | 檢索資源 |
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| POST | 否 | 否 | 建立資源、觸發動作 |
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| PUT | 是 | 否 | 完整替換資源 |
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| PATCH | 否* | 否 | 部分更新資源 |
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| DELETE | 是 | 否 | 移除資源 |
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*PATCH 若有正確實作也可以具備冪等性。
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### 狀態碼參考
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```
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# 成功 (Success)
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200 OK — GET, PUT, PATCH (含回應主體)
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201 Created — POST (應包含 Location 標頭)
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204 No Content — DELETE, PUT (無回應主體)
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# 客戶端錯誤 (Client Errors)
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400 Bad Request — 驗證失敗、JSON 格式錯誤
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401 Unauthorized — 缺失或無效的身分驗證
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403 Forbidden — 已驗證但無權限
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404 Not Found — 資源不存在
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409 Conflict — 重複輸入、狀態衝突
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422 Unprocessable Entity — 語法正確但語意無效 (JSON 合法,數據有誤)
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429 Too Many Requests — 超過速率限制
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# 伺服器錯誤 (Server Errors)
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500 Internal Server Error — 非預期失敗 (絕對不要暴露詳細細節)
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502 Bad Gateway — 上游服務失敗
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503 Service Unavailable — 暫時性超載,應包含 Retry-After
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```
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### 常見錯誤
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```
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# 錯誤範例 (BAD):不論什麼情況都回傳 200
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{ "status": 200, "success": false, "error": "Not found" }
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# 正確案例 (GOOD):語意化地使用 HTTP 狀態碼
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HTTP/1.1 404 Not Found
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{ "error": { "code": "not_found", "message": "User not found" } }
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# 錯誤範例 (BAD):針對驗證錯誤回傳 500
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# 正確案例 (GOOD):回傳 400 或 422 並提供欄位級別的詳細資訊
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# 錯誤範例 (BAD):針對建立的資源回傳 200
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# 正確案例 (GOOD):回傳 201 並附帶 Location 標頭
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HTTP/1.1 201 Created
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Location: /api/v1/users/abc-123
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```
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## 回應格式 (Response Format)
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### 成功回應
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```json
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{
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"data": {
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"id": "abc-123",
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"email": "alice@example.com",
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"name": "Alice",
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"created_at": "2025-01-15T10:30:00Z"
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}
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}
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```
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### 集合回應 (包含分頁)
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```json
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{
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"data": [
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{ "id": "abc-123", "name": "Alice" },
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{ "id": "def-456", "name": "Bob" }
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],
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"meta": {
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"total": 142,
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"page": 1,
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"per_page": 20,
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"total_pages": 8
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},
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"links": {
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"self": "/api/v1/users?page=1&per_page=20",
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"next": "/api/v1/users?page=2&per_page=20",
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"last": "/api/v1/users?page=8&per_page=20"
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}
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}
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```
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### 錯誤回應
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```json
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{
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"error": {
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"code": "validation_error",
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"message": "Request validation failed",
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"details": [
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{
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"field": "email",
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"message": "Must be a valid email address",
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"code": "invalid_format"
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},
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{
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"field": "age",
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"message": "Must be between 0 and 150",
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"code": "out_of_range"
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}
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]
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}
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}
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```
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### 回應外殼 (Envelope) 變體
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```typescript
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// 選項 A:帶有數據包裝的外殼 (建議用於公眾 API)
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interface ApiResponse<T> {
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data: T;
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meta?: PaginationMeta;
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links?: PaginationLinks;
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}
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interface ApiError {
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error: {
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code: string;
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message: string;
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details?: FieldError[];
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};
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}
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// 選項 B:扁平化回應 (較簡單,常見於內部 API)
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// 成功:直接回傳資源
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// 錯誤:回傳錯誤物件
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// 透過 HTTP 狀態碼進行區分
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```
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## 分頁 (Pagination)
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### 基於偏移量 (Offset-Based,簡單)
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```
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GET /api/v1/users?page=2&per_page=20
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# 實作概念
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SELECT * FROM users
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ORDER BY created_at DESC
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LIMIT 20 OFFSET 20;
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```
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**點:** 易於實作,支援「跳轉到第 N 頁」。
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**缺點:** 對於大型偏移量 (OFFSET 100000) 效能較慢,且在併發插入時會出現不一致的情況。
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### 基於游標 (Cursor-Based,具擴展性)
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```
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GET /api/v1/users?cursor=eyJpZCI6MTIzfQ&limit=20
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# 實作概念
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SELECT * FROM users
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WHERE id > :cursor_id
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ORDER BY id ASC
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LIMIT 21; -- 多抓一個以判斷是否有下一頁 (has_next)
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```
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```json
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{
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"data": [...],
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"meta": {
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"has_next": true,
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"next_cursor": "eyJpZCI6MTQzfQ"
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}
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}
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```
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**優點:** 不論位置如何效能皆保持一致,且在併發插入時表現穩定。
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**缺點:** 無法跳轉到任意頁碼,且游標內容不具備可讀性。
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### 該選用哪一種?
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| 使用情境 | 分頁類型 |
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|----------|----------------|
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| 管理後台、小型資料集 (<10K) | 偏移量 (Offset) |
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| 無限滾動、動態牆、大型資料集 | 游標 (Cursor) |
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| 公眾 API | 預設游標 (可選配偏移量) |
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| 搜尋結果 | 偏移量 (使用者預期看到頁碼) |
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## 篩選、排序與搜尋
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### 篩選 (Filtering)
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```
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# 簡單等值
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GET /api/v1/orders?status=active&customer_id=abc-123
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# 比較運算子 (使用括號表示)
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GET /api/v1/products?price[gte]=10&price[lte]=100
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GET /api/v1/orders?created_at[after]=2025-01-01
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# 多重數值 (逗號分隔)
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GET /api/v1/products?category=electronics,clothing
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# 巢狀欄位 (點表示法)
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GET /api/v1/orders?customer.country=US
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```
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### 排序 (Sorting)
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```
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# 單一欄位 (前綴 - 表示降冪)
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GET /api/v1/products?sort=-created_at
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# 多個欄位 (逗號分隔)
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GET /api/v1/products?sort=-featured,price,-created_at
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```
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### 全文檢索 (Full-Text Search)
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```
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# 搜尋查詢參數
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GET /api/v1/products?q=wireless+headphones
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# 特定欄位搜尋
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GET /api/v1/users?email=alice
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```
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### 稀疏欄位集 (Sparse Fieldsets)
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```
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# 僅返回指定欄位 (減少回應體體積)
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GET /api/v1/users?fields=id,name,email
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GET /api/v1/orders?fields=id,total,status&include=customer.name
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```
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## 身分驗證與授權
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### 基於 Token 的驗證
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```
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# Authorization 標頭中的 Bearer token
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GET /api/v1/users
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Authorization: Bearer eyJhbGciOiJIUzI1NiIs...
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# API key (用於伺服器對伺服器通訊)
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GET /api/v1/data
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X-API-Key: sk_live_abc123
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```
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### 授權模式 (Authorization Patterns)
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```typescript
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// 資源級別:檢查所有權
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app.get("/api/v1/orders/:id", async (req, res) => {
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const order = await Order.findById(req.params.id);
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if (!order) return res.status(404).json({ error: { code: "not_found" } });
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if (order.userId !== req.user.id) return res.status(403).json({ error: { code: "forbidden" } });
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return res.json({ data: order });
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});
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// 基於角色:檢查權限
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app.delete("/api/v1/users/:id", requireRole("admin"), async (req, res) => {
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await User.delete(req.params.id);
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return res.status(204).send();
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});
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```
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## 速率限制 (Rate Limiting)
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### 標頭 (Headers)
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```
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HTTP/1.1 200 OK
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|||
|
|
X-RateLimit-Limit: 100
|
|||
|
|
X-RateLimit-Remaining: 95
|
|||
|
|
X-RateLimit-Reset: 1640000000
|
|||
|
|
|
|||
|
|
# 超過限制時
|
|||
|
|
HTTP/1.1 429 Too Many Requests
|
|||
|
|
Retry-After: 60
|
|||
|
|
{
|
|||
|
|
"error": {
|
|||
|
|
"code": "rate_limit_exceeded",
|
|||
|
|
"message": "Rate limit exceeded. Try again in 60 seconds."
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
### 速率限制分層
|
|||
|
|
|
|||
|
|
| 層級 | 限制 | 視窗 | 使用情境 |
|
|||
|
|
|------|-------|--------|----------|
|
|||
|
|
| 匿名 | 30/min | 每 IP | 公眾端點 |
|
|||
|
|
| 已驗證 | 100/min | 每使用者 | 標準 API 存取 |
|
|||
|
|
| 高級 (Premium) | 1000/min | 每 API key | 付費 API 方案 |
|
|||
|
|
| 內部 | 10000/min | 每服務 | 服務間通訊 |
|
|||
|
|
|
|||
|
|
## 版本控制 (Versioning)
|
|||
|
|
|
|||
|
|
### URL 路徑版本控制 (建議方案)
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
/api/v1/users
|
|||
|
|
/api/v2/users
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
**優點:** 明確、易於路由、可緩存。
|
|||
|
|
**缺點:** 不同版本間 URL 會更動。
|
|||
|
|
|
|||
|
|
### 標頭版本控制 (Header Versioning)
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
GET /api/users
|
|||
|
|
Accept: application/vnd.myapp.v2+json
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
**優點:** URL 保持乾淨。
|
|||
|
|
**缺點:** 較難測試、容易遺忘。
|
|||
|
|
|
|||
|
|
### 版本控制策略
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
1. 以 /api/v1/ 開始 — 在有需求之前不要進行版本控制。
|
|||
|
|
2. 最多維持 2 個活動版本 (當前版 + 前一版)。
|
|||
|
|
3. 棄用 (Deprecation) 時間表:
|
|||
|
|
- 宣佈棄用 (公眾 API 提前 6 個月通知)。
|
|||
|
|
- 加入 Sunset 標頭:Sunset: Sat, 01 Jan 2026 00:00:00 GMT。
|
|||
|
|
- 棄用日期後,回傳 410 Gone。
|
|||
|
|
4. 非破壞性變更不需要新版本:
|
|||
|
|
- 在回應中新增欄位。
|
|||
|
|
- 新增可選的查詢參數。
|
|||
|
|
- 新增端點。
|
|||
|
|
5. 破壞性變更需要新版本:
|
|||
|
|
- 移除或重新命名欄位。
|
|||
|
|
- 更改欄位型別。
|
|||
|
|
- 更改 URL 結構。
|
|||
|
|
- 更改身分驗證方法。
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## 實作模式
|
|||
|
|
|
|||
|
|
### TypeScript (Next.js API Route)
|
|||
|
|
|
|||
|
|
```typescript
|
|||
|
|
import { z } from "zod";
|
|||
|
|
import { NextRequest, NextResponse } from "next/server";
|
|||
|
|
|
|||
|
|
const createUserSchema = z.object({
|
|||
|
|
email: z.string().email(),
|
|||
|
|
name: z.string().min(1).max(100),
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
export async function POST(req: NextRequest) {
|
|||
|
|
const body = await req.json();
|
|||
|
|
const parsed = createUserSchema.safeParse(body);
|
|||
|
|
|
|||
|
|
if (!parsed.success) {
|
|||
|
|
return NextResponse.json({
|
|||
|
|
error: {
|
|||
|
|
code: "validation_error",
|
|||
|
|
message: "Request validation failed",
|
|||
|
|
details: parsed.error.issues.map(i => ({
|
|||
|
|
field: i.path.join("."),
|
|||
|
|
message: i.message,
|
|||
|
|
code: i.code,
|
|||
|
|
})),
|
|||
|
|
},
|
|||
|
|
}, { status: 422 });
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
const user = await createUser(parsed.data);
|
|||
|
|
|
|||
|
|
return NextResponse.json(
|
|||
|
|
{ data: user },
|
|||
|
|
{
|
|||
|
|
status: 201,
|
|||
|
|
headers: { Location: `/api/v1/users/${user.id}` },
|
|||
|
|
},
|
|||
|
|
);
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
### Python (Django REST Framework)
|
|||
|
|
|
|||
|
|
```python
|
|||
|
|
from rest_framework import serializers, viewsets, status
|
|||
|
|
from rest_framework.response import Response
|
|||
|
|
|
|||
|
|
class CreateUserSerializer(serializers.Serializer):
|
|||
|
|
email = serializers.EmailField()
|
|||
|
|
name = serializers.CharField(max_length=100)
|
|||
|
|
|
|||
|
|
class UserSerializer(serializers.ModelSerializer):
|
|||
|
|
class Meta:
|
|||
|
|
model = User
|
|||
|
|
fields = ["id", "email", "name", "created_at"]
|
|||
|
|
|
|||
|
|
class UserViewSet(viewsets.ModelViewSet):
|
|||
|
|
serializer_class = UserSerializer
|
|||
|
|
permission_classes = [IsAuthenticated]
|
|||
|
|
|
|||
|
|
def get_serializer_class(self):
|
|||
|
|
if self.action == "create":
|
|||
|
|
return CreateUserSerializer
|
|||
|
|
return UserSerializer
|
|||
|
|
|
|||
|
|
def create(self, request):
|
|||
|
|
serializer = CreateUserSerializer(data=request.data)
|
|||
|
|
serializer.is_valid(raise_exception=True)
|
|||
|
|
user = UserService.create(**serializer.validated_data)
|
|||
|
|
return Response(
|
|||
|
|
{"data": UserSerializer(user).data},
|
|||
|
|
status=status.HTTP_201_CREATED,
|
|||
|
|
headers={"Location": f"/api/v1/users/{user.id}"},
|
|||
|
|
)
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
### Go (net/http)
|
|||
|
|
|
|||
|
|
```go
|
|||
|
|
func (h *UserHandler) CreateUser(w http.ResponseWriter, r *http.Request) {
|
|||
|
|
var req CreateUserRequest
|
|||
|
|
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
|
|||
|
|
writeError(w, http.StatusBadRequest, "invalid_json", "Invalid request body")
|
|||
|
|
return
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if err := req.Validate(); err != nil {
|
|||
|
|
writeError(w, http.StatusUnprocessableEntity, "validation_error", err.Error())
|
|||
|
|
return
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
user, err := h.service.Create(r.Context(), req)
|
|||
|
|
if err != nil {
|
|||
|
|
switch {
|
|||
|
|
case errors.Is(err, domain.ErrEmailTaken):
|
|||
|
|
writeError(w, http.StatusConflict, "email_taken", "Email already registered")
|
|||
|
|
default:
|
|||
|
|
writeError(w, http.StatusInternalServerError, "internal_error", "Internal error")
|
|||
|
|
}
|
|||
|
|
return
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
w.Header().Set("Location", fmt.Sprintf("/api/v1/users/%s", user.ID))
|
|||
|
|
writeJSON(w, http.StatusCreated, map[string]any{"data": user})
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## API 設計檢核清單
|
|||
|
|
|
|||
|
|
在交付新端點之前:
|
|||
|
|
|
|||
|
|
- [ ] 資源 URL 遵循命名規範 (複數、kebab-case、不含動詞)
|
|||
|
|
- [ ] 使用正確的 HTTP 方法 (GET 用於讀取,POST 用於建立等)
|
|||
|
|
- [ ] 回傳適當的狀態碼 (不論什麼情況都回傳 200 是錯誤的)
|
|||
|
|
- [ ] 輸入經過 Schema 驗證 (Zod, Pydantic, Bean Validation)
|
|||
|
|
- [ ] 錯誤回應遵循標準格式,包含代碼與訊息
|
|||
|
|
- [ ] 對於清單端點已實作分頁 (游標或偏移量)
|
|||
|
|
- [ ] 要求身分驗證 (或明確標註為公眾存取)
|
|||
|
|
- [ ] 已檢查授權 (使用者僅能存取自己的資源)
|
|||
|
|
- [ ] 已配置速率限制
|
|||
|
|
- [ ] 回應中不會洩漏內部細節 (堆疊追蹤、SQL 錯誤等)
|
|||
|
|
- [ ] 與現有端點的命名方式保持一致 (camelCase vs snake_case)
|
|||
|
|
- [ ] 已撰寫文件 (OpenAPI/Swagger 規範已更新)
|