新增錯誤排查與支援文件,提供常見問題解決方案;新增開發與貢獻指南,說明專案結構與開發流程;新增授權說明文件,詳述AGPL-3.0授權條款及第三方元件使用情況。

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# API 文件
ConvertX-CN 提供選用的 API Server支援 REST 和 GraphQL 兩種 API 介面。
---
## 目錄
- [快速啟用](#快速啟用)
- [認證機制](#認證機制)
- [REST API 端點](#rest-api-端點)
- [GraphQL API](#graphql-api)
- [錯誤碼說明](#錯誤碼說明)
- [使用範例](#使用範例)
---
## 快速啟用
API Server 是**選用功能**,不影響 Web UI 使用。
### 啟用方式
```bash
docker compose --profile api up -d
```
### 服務端口
| 服務 | 端口 | 說明 |
|------|------|------|
| Web UI | 3000 | 網頁介面 |
| API Server | 3001 | REST & GraphQL |
### 環境變數
| 變數 | 說明 | 預設值 |
|------|------|--------|
| `API_HOST` | 監聽地址 | `0.0.0.0` |
| `API_PORT` | 監聽埠 | `3001` |
| `JWT_SECRET` | JWT 驗證密鑰 | (需自行設定) |
| `UPLOAD_DIR` | 上傳目錄 | `./data/uploads` |
| `OUTPUT_DIR` | 輸出目錄 | `./data/output` |
| `MAX_FILE_SIZE` | 最大檔案大小bytes | `104857600` |
---
## 認證機制
所有 API 請求(除健康檢查外)都需要 JWT Bearer Token
```http
Authorization: Bearer <your-jwt-token>
```
### Token 結構
```json
{
"sub": "user-id",
"exp": 1234567890,
"iat": 1234567890,
"email": "user@example.com",
"roles": ["user"]
}
```
> ⚠️ **注意**API Server 只負責驗證 JWT不負責產生 JWT。Token 應由獨立的認證服務產生。
---
## REST API 端點
**Base URL**: `http://localhost:3001/api/v1`
### 健康檢查
檢查 API Server 運行狀態。
**請求**
```http
GET /health
```
**回應**
```json
{
"status": "healthy",
"version": "0.1.0",
"timestamp": "2026-01-25T10:30:00Z"
}
```
---
### 取得支援格式
取得所有支援的輸入/輸出格式。
**請求**
```http
GET /api/v1/formats
Authorization: Bearer <token>
```
**回應**
```json
{
"converters": [
{
"name": "ffmpeg",
"inputFormats": ["mp4", "mkv", "avi", "..."],
"outputFormats": ["mp4", "webm", "mp3", "..."]
},
{
"name": "imagemagick",
"inputFormats": ["png", "jpg", "heic", "..."],
"outputFormats": ["png", "jpg", "webp", "..."]
}
]
}
```
---
### 上傳檔案
上傳待轉換的檔案。
**請求**
```http
POST /api/v1/upload
Authorization: Bearer <token>
Content-Type: multipart/form-data
file: <binary>
```
**回應**
```json
{
"success": true,
"fileId": "abc123",
"filename": "document.docx",
"size": 1048576,
"mimeType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
}
```
---
### 開始轉換
對已上傳的檔案進行轉換。
**請求**
```http
POST /api/v1/convert
Authorization: Bearer <token>
Content-Type: application/json
{
"fileId": "abc123",
"outputFormat": "pdf",
"options": {
"quality": "high"
}
}
```
**回應**
```json
{
"success": true,
"jobId": "job456",
"status": "processing",
"estimatedTime": 30
}
```
---
### 查詢轉換狀態
取得轉換任務的當前狀態。
**請求**
```http
GET /api/v1/jobs/{jobId}
Authorization: Bearer <token>
```
**回應(處理中)**
```json
{
"jobId": "job456",
"status": "processing",
"progress": 45,
"message": "Converting page 3 of 10..."
}
```
**回應(完成)**
```json
{
"jobId": "job456",
"status": "completed",
"progress": 100,
"result": {
"fileId": "result789",
"filename": "document.pdf",
"size": 524288,
"downloadUrl": "/api/v1/download/result789"
}
}
```
---
### 下載結果
下載轉換完成的檔案。
**請求**
```http
GET /api/v1/download/{fileId}
Authorization: Bearer <token>
```
**回應**
```
HTTP/1.1 200 OK
Content-Type: application/pdf
Content-Disposition: attachment; filename="document.pdf"
<binary content>
```
---
### 刪除檔案
刪除已上傳或轉換完成的檔案。
**請求**
```http
DELETE /api/v1/files/{fileId}
Authorization: Bearer <token>
```
**回應**
```json
{
"success": true,
"message": "File deleted successfully"
}
```
---
## GraphQL API
**Endpoint**: `http://localhost:3001/graphql`
### Schema 概覽
```graphql
type Query {
health: Health!
formats: [Converter!]!
job(id: ID!): Job
jobs: [Job!]!
}
type Mutation {
upload(file: Upload!): UploadResult!
convert(input: ConvertInput!): ConvertResult!
deleteFile(fileId: ID!): DeleteResult!
}
type Health {
status: String!
version: String!
timestamp: String!
}
type Converter {
name: String!
inputFormats: [String!]!
outputFormats: [String!]!
}
type Job {
id: ID!
status: JobStatus!
progress: Int!
message: String
result: ConvertedFile
}
enum JobStatus {
PENDING
PROCESSING
COMPLETED
FAILED
}
```
### 查詢範例
**取得所有格式**
```graphql
query {
formats {
name
inputFormats
outputFormats
}
}
```
**查詢任務狀態**
```graphql
query {
job(id: "job456") {
status
progress
message
result {
filename
size
downloadUrl
}
}
}
```
### 變更範例
**開始轉換**
```graphql
mutation {
convert(input: {
fileId: "abc123"
outputFormat: "pdf"
options: { quality: "high" }
}) {
jobId
status
}
}
```
---
## 錯誤碼說明
### HTTP 狀態碼
| 狀態碼 | 說明 | 常見原因 |
|--------|------|---------|
| 200 | 成功 | 請求正常處理 |
| 400 | 錯誤請求 | 參數錯誤、格式不支援 |
| 401 | 未授權 | Token 無效或過期 |
| 403 | 禁止存取 | 權限不足 |
| 404 | 找不到 | 檔案或任務不存在 |
| 413 | 檔案太大 | 超過上傳限制 |
| 415 | 格式不支援 | 不支援的檔案類型 |
| 500 | 伺服器錯誤 | 內部錯誤 |
| 503 | 服務不可用 | 伺服器過載 |
### 錯誤回應格式
```json
{
"success": false,
"error": {
"code": "UNSUPPORTED_FORMAT",
"message": "The format 'xyz' is not supported",
"details": {
"inputFormat": "xyz",
"supportedFormats": ["pdf", "docx", "png"]
}
}
}
```
### 常見錯誤碼
| 錯誤碼 | 說明 | 解決方法 |
|--------|------|---------|
| `INVALID_TOKEN` | Token 無效 | 重新取得有效 Token |
| `TOKEN_EXPIRED` | Token 過期 | 刷新 Token |
| `FILE_NOT_FOUND` | 檔案不存在 | 確認檔案 ID 正確 |
| `UNSUPPORTED_FORMAT` | 格式不支援 | 查看支援格式列表 |
| `FILE_TOO_LARGE` | 檔案過大 | 壓縮或分割檔案 |
| `CONVERSION_FAILED` | 轉換失敗 | 檢查檔案是否損壞 |
| `RATE_LIMITED` | 請求過頻繁 | 降低請求頻率 |
---
## 使用範例
### cURL 範例
**上傳並轉換檔案**
```bash
# 1. 上傳檔案
FILE_RESPONSE=$(curl -X POST \
-H "Authorization: Bearer $TOKEN" \
-F "file=@document.docx" \
http://localhost:3001/api/v1/upload)
FILE_ID=$(echo $FILE_RESPONSE | jq -r '.fileId')
# 2. 開始轉換
JOB_RESPONSE=$(curl -X POST \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-d "{\"fileId\": \"$FILE_ID\", \"outputFormat\": \"pdf\"}" \
http://localhost:3001/api/v1/convert)
JOB_ID=$(echo $JOB_RESPONSE | jq -r '.jobId')
# 3. 等待完成並下載
sleep 10
curl -H "Authorization: Bearer $TOKEN" \
http://localhost:3001/api/v1/download/$FILE_ID \
-o output.pdf
```
### Python 範例
```python
import requests
BASE_URL = "http://localhost:3001/api/v1"
TOKEN = "your-jwt-token"
HEADERS = {"Authorization": f"Bearer {TOKEN}"}
# 上傳檔案
with open("document.docx", "rb") as f:
response = requests.post(
f"{BASE_URL}/upload",
headers=HEADERS,
files={"file": f}
)
file_id = response.json()["fileId"]
# 開始轉換
response = requests.post(
f"{BASE_URL}/convert",
headers=HEADERS,
json={"fileId": file_id, "outputFormat": "pdf"}
)
job_id = response.json()["jobId"]
# 輪詢狀態
import time
while True:
response = requests.get(f"{BASE_URL}/jobs/{job_id}", headers=HEADERS)
status = response.json()["status"]
if status == "completed":
break
time.sleep(2)
# 下載結果
result_id = response.json()["result"]["fileId"]
response = requests.get(f"{BASE_URL}/download/{result_id}", headers=HEADERS)
with open("output.pdf", "wb") as f:
f.write(response.content)
```
### JavaScript 範例
```javascript
const BASE_URL = 'http://localhost:3001/api/v1';
const TOKEN = 'your-jwt-token';
async function convertFile(file, outputFormat) {
// 上傳檔案
const formData = new FormData();
formData.append('file', file);
const uploadResponse = await fetch(`${BASE_URL}/upload`, {
method: 'POST',
headers: { 'Authorization': `Bearer ${TOKEN}` },
body: formData
});
const { fileId } = await uploadResponse.json();
// 開始轉換
const convertResponse = await fetch(`${BASE_URL}/convert`, {
method: 'POST',
headers: {
'Authorization': `Bearer ${TOKEN}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({ fileId, outputFormat })
});
const { jobId } = await convertResponse.json();
// 輪詢狀態
let result;
while (true) {
const statusResponse = await fetch(`${BASE_URL}/jobs/${jobId}`, {
headers: { 'Authorization': `Bearer ${TOKEN}` }
});
const job = await statusResponse.json();
if (job.status === 'completed') {
result = job.result;
break;
}
await new Promise(resolve => setTimeout(resolve, 2000));
}
// 下載結果
const downloadResponse = await fetch(`${BASE_URL}/download/${result.fileId}`, {
headers: { 'Authorization': `Bearer ${TOKEN}` }
});
return await downloadResponse.blob();
}
```
---
[⬆️ 回到頂部](#api-文件) | [📚 回到目錄](00-專案總覽.md)