tachybase_todo/docs/en-US/development/guide/middleware.md
chenos a6eebb940f
feat: update docs (#990)
* feat: improve code

* feat: update docs

* feat: update docs

* Update index.md

* Update features.md

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* Update contributing.md

* Update translations.md

* feat: clean up

* Add files via upload

* Update the-first-app.md

* Update plugins.md

* Update a-b-c.md

* Update blocks.md

* feat: update docs

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* Update charts.md

* feat: update navs

* Update index.md

* Update index.md

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* Update index.md

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* Update git-clone.md

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Co-authored-by: Zhou <zhou.working@gmail.com>
2022-10-31 11:52:17 +08:00

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# 中间件
## 添加方法
1. `app.acl.use()` 添加资源权限级中间件,在权限判断之前执行
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
3. `app.use()` 添加应用级中间件,每次请求都执行
## 洋葱圈模型
```ts
app.use(async (ctx, next) => {
ctx.body = ctx.body || [];
ctx.body.push(1);
await next();
ctx.body.push(2);
});
app.use(async (ctx, next) => {
ctx.body = ctx.body || [];
ctx.body.push(3);
await next();
ctx.body.push(4);
});
```
访问 http://localhost:13000/api/hello 查看,浏览器响应的数据是:
```js
{"data": [1,3,4,2]}
```
## 内置中间件及执行顺序
1. `cors`
2. `bodyParser`
3. `i18n`
4. `dataWrapping`
5. `db2resource`
6. `restApi`
1. `parseToken`
2. `checkRole`
3. `acl`
1. `acl.use()` 添加的其他中间件
4. `resourcer.use()` 添加的其他中间件
5. action handler
7. `app.use()` 添加的其他中间件
也可以使用 `before``after` 将中间件插入到前面的某个 `tag` 标记的位置,如:
```ts
app.use(m1, { tag: 'restApi' });
app.resourcer.use(m2, { tag: 'parseToken' });
app.resourcer.use(m3, { tag: 'checkRole' });
// m4 将排在 m1 前面
app.use(m4, { before: 'restApi' });
// m5 会插入到 m2 和 m3 之间
app.resourcer.use(m5, { after: 'parseToken', before: 'checkRole' });
```
如果未特殊指定位置,新增的中间件的执行顺序是:
1. 优先执行 acl.use 添加的,
2. 然后是 resourcer.use 添加的,包括 middleware handler 和 action handler
3. 最后是 app.use 添加的。
```ts
app.use(async (ctx, next) => {
ctx.body = ctx.body || [];
ctx.body.push(1);
await next();
ctx.body.push(2);
});
app.resourcer.use(async (ctx, next) => {
ctx.body = ctx.body || [];
ctx.body.push(3);
await next();
ctx.body.push(4);
});
app.acl.use(async (ctx, next) => {
ctx.body = ctx.body || [];
ctx.body.push(5);
await next();
ctx.body.push(6);
});
app.resourcer.define({
name: 'test',
actions: {
async list(ctx, next) {
ctx.body = ctx.body || [];
ctx.body.push(7);
await next();
ctx.body.push(8);
},
},
});
```
访问 http://localhost:13000/api/hello 查看,浏览器响应的数据是:
```js
{"data": [1,2]}
```
访问 http://localhost:13000/api/test:list 查看,浏览器响应的数据是:
```js
{"data": [5,3,7,1,2,8,4,6]}
```
### resource 未定义,不执行 resourcer.use() 添加的中间件
```ts
app.use(async (ctx, next) => {
ctx.body = ctx.body || [];
ctx.body.push(1);
await next();
ctx.body.push(2);
});
app.resourcer.use(async (ctx, next) => {
ctx.body = ctx.body || [];
ctx.body.push(3);
await next();
ctx.body.push(4);
});
```
访问 http://localhost:13000/api/hello 查看,浏览器响应的数据是:
```js
{"data": [1,2]}
```
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
## 中间件用途
待补充
## 完整示例
待补充
- [samples/ratelimit](https://github.com/nocobase/nocobase/blob/main/packages/samples/ratelimit/) IP rate-limiting