How to write global authentication middleware

[Jengro777]

module main

import veb

struct Context {
	veb.Context
}

struct App {
	veb.Middleware[Context]
}

fn (mut app App) index(mut ctx Context) veb.Result {
	return ctx.json('index succcess') //不正常
}

fn main() {
	port := 9009
	mut app := &App{}
	app.authority_middleware()
	veb.run[App, Context](mut app, port)
}

// 初始化中间件并设置 handler ,并返回中间件选项
fn (mut app App) authority_middleware() veb.MiddlewareOptions[Context] {
	return veb.MiddlewareOptions[Context]{
		handler: verify_app
		after:   false
	}
}

fn verify_app(mut ctx Context) bool {
	mut ay := App{}
	ay.send_error(mut ctx, 'err token')
	ctx.send_response_to_client('', '')
	return false
}

fn (mut app App) send_error(mut ctx Context, msg string) veb.Result {
	ctx.res.set_status(.unauthorized)
	ctx.res.header.set(.content_type, 'application/json')
	ctx.send_response_to_client('application/json', '${msg}')

	ctx.server_error('401')
	ctx.request_error('4646')
	// ctx.before_request()
	// ctx.error('Bad credentials')
	// ctx.not_found()
	return ctx.request_error('4646')
}

Write it this way, authentication returns false. But the program will still return an "index success" message instead of an authentication error message

[martinskou]

You need to hook up the middleware using:
app.use()
or
app.route_use()

[Jengro777]

module main

import veb

struct Context {
	veb.Context
}

struct App {
	veb.Middleware[Context]
}

fn (mut app App) index(mut ctx Context) veb.Result {
	return ctx.json('index succcess') //不正常
}

fn main() {
	port := 9009
	mut app := &App{}
	app.use(app.authority_middleware())
	veb.run[App, Context](mut app, port)
}

// 初始化中间件并设置 handler ,并返回中间件选项
fn (mut app App) authority_middleware() veb.MiddlewareOptions[Context] {
	return veb.MiddlewareOptions[Context]{
		handler: verify_app
		after:   false
	}
}

fn verify_app(mut ctx Context) bool {
	if true {
		send_error(mut ctx, 'err token')
	}
	return true
}

fn send_error(mut ctx Context, msg string) veb.Result {
	// ctx.res.set_status(.unauthorized)
	return ctx.text('error unauthorized')
}

[Jengro777]

[veb] a response cannot be sent twice over one connection