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https://github.com/nocobase/nocobase
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* feat: update docs * feat: update docs * fix: update docs * Add files via upload * Add files via upload * Update the-first-app.md * Update the-first-app.md * Update v08-changelog.md * feat: update docs Co-authored-by: Zhou <zhou.working@gmail.com>
161 lines
3.3 KiB
Markdown
161 lines
3.3 KiB
Markdown
# 中间件
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## 如何注册中间件?
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中间件的注册方法一般写在 load 方法里
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```ts
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export class MyPlugin extends Plugin {
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load() {
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this.app.acl.use();
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this.app.resourcer.use();
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this.app.use();
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}
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}
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```
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说明:
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1. `app.acl.use()` 添加资源权限级中间件,在权限判断之前执行
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2. `app.resourcer.use()` 添加资源级中间件,只有请求已定义的 resource 时才执行
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3. `app.use()` 添加应用级中间件,每次请求都执行
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## 洋葱圈模型
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```ts
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app.use(async (ctx, next) => {
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ctx.body = ctx.body || [];
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ctx.body.push(1);
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await next();
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ctx.body.push(2);
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});
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app.use(async (ctx, next) => {
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ctx.body = ctx.body || [];
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ctx.body.push(3);
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await next();
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ctx.body.push(4);
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});
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```
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访问 http://localhost:13000/api/hello 查看,浏览器响应的数据是:
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```js
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{"data": [1,3,4,2]}
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```
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## 内置中间件及执行顺序
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1. `cors`
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2. `bodyParser`
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3. `i18n`
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4. `dataWrapping`
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5. `db2resource`
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6. `restApi`
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1. `parseToken`
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2. `checkRole`
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3. `acl`
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1. `acl.use()` 添加的其他中间件
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4. `resourcer.use()` 添加的其他中间件
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5. action handler
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7. `app.use()` 添加的其他中间件
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也可以使用 `before` 或 `after` 将中间件插入到前面的某个 `tag` 标记的位置,如:
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```ts
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app.use(m1, { tag: 'restApi' });
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app.resourcer.use(m2, { tag: 'parseToken' });
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app.resourcer.use(m3, { tag: 'checkRole' });
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// m4 将排在 m1 前面
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app.use(m4, { before: 'restApi' });
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// m5 会插入到 m2 和 m3 之间
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app.resourcer.use(m5, { after: 'parseToken', before: 'checkRole' });
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```
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如果未特殊指定位置,新增的中间件的执行顺序是:
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1. 优先执行 acl.use 添加的,
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2. 然后是 resourcer.use 添加的,包括 middleware handler 和 action handler,
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3. 最后是 app.use 添加的。
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```ts
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app.use(async (ctx, next) => {
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ctx.body = ctx.body || [];
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ctx.body.push(1);
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await next();
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ctx.body.push(2);
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});
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app.resourcer.use(async (ctx, next) => {
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ctx.body = ctx.body || [];
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ctx.body.push(3);
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await next();
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ctx.body.push(4);
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});
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app.acl.use(async (ctx, next) => {
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ctx.body = ctx.body || [];
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ctx.body.push(5);
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await next();
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ctx.body.push(6);
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});
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app.resourcer.define({
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name: 'test',
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actions: {
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async list(ctx, next) {
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ctx.body = ctx.body || [];
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ctx.body.push(7);
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await next();
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ctx.body.push(8);
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},
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},
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});
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```
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访问 http://localhost:13000/api/hello 查看,浏览器响应的数据是:
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```js
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{"data": [1,2]}
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```
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访问 http://localhost:13000/api/test:list 查看,浏览器响应的数据是:
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```js
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{"data": [5,3,7,1,2,8,4,6]}
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```
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### resource 未定义,不执行 resourcer.use() 添加的中间件
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```ts
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app.use(async (ctx, next) => {
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ctx.body = ctx.body || [];
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ctx.body.push(1);
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await next();
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ctx.body.push(2);
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});
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app.resourcer.use(async (ctx, next) => {
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ctx.body = ctx.body || [];
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ctx.body.push(3);
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await next();
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ctx.body.push(4);
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});
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```
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访问 http://localhost:13000/api/hello 查看,浏览器响应的数据是:
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```js
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{"data": [1,2]}
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```
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以上示例,hello 资源未定义,不会进入 resourcer,所以就不会执行 resourcer 里的中间件
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## 中间件用途
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待补充
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## 示例
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- [samples/ratelimit](https://github.com/nocobase/nocobase/blob/main/packages/samples/ratelimit/) IP rate-limiting
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