[英]dynamicly add handlers to an express route function
what i am actually mean is, assume i have this code: 我的实际意思是,假设我有以下代码:
var ARouter = Router();
@Validate({
params: {
id: joi.number(),
x: joi.number()
}
})
@HttpGet('/foo/:id')
foo(req: Request, res: Response) {
res.send('in foo').end();
}
function HttpGet(path: string) {
return function (target: ApiController, propertyName: string, descriptor: TypedPropertyDescriptor<RequestHandler>) {
ARouter.get(path, descriptor.value);
}
}
what i have here is a router, decorators, and a foo function. 我在这里拥有的是路由器,装饰器和foo函数。 the HttpGet decorator creates a route with the path 'foo/:id' and foo as its only handler in ARouter.
HttpGet装饰器创建一个路径为foo /:id且foo为ARouter中唯一处理程序的路由。
i want the @validate decorator to add another handler (specific function middleware, will be called before foo) to the foo route handlers stack. 我希望@validate装饰器将另一个处理程序(特定功能中间件,将在foo之前调用)添加到foo路由处理程序堆栈中。 eg like it was router.get('/foo/:id/, validationFunction, foo).
例如,就像是router.get('/ foo /:id /,validationFunction,foo)。
is there a way to dynamiclly add handler to the foo route in the router? 有没有办法在路由器的foo路由中动态添加处理程序?
Thanks! 谢谢!
Based on the decorators documentation : 根据装饰器文档 :
When multiple decorators apply to a single declaration, their evaluation is similar to function composition in mathematics.
当多个修饰符应用于一个声明时,其求值类似于数学中的函数组成。 In this model, when composing functions f and g, the resulting composite (f ∘ g)(x) is equivalent to f(g(x)).
在这个模型中,当组合函数f和g时,所得的合成(f∘g)(x)等于f(g(x))。
So you can do something like: 因此,您可以执行以下操作:
function validate(params: any, fn: (req: Request, res: Response) => void) {
// validate data here and based on that decide what to do next
}
function Validate(params: any) {
return function(target: any, propertyKey: string, descriptor: PropertyDescriptor) {
const newDescriptor = Object.assign({}, descriptor);
newDescriptor.value = function(req: Request, res: Response) {
validate(params, descriptor.value);
}
return newDescriptor;
}
}
And change the order of your decorators: 并更改装饰器的顺序:
@HttpGet('/foo/:id')
@Validate({
params: {
id: joi.number(),
x: joi.number()
}
})
foo(req: Request, res: Response) {
res.send('in foo').end();
}
(keep in mind that I haven't tested it) (请记住,我还没有测试过)
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