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v/examples/vweb/middleware/vweb_example.v

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module main
import vweb
// for another example see vlib/vweb/tests/middleware_test_server.v
const (
http_port = 8080
)
struct App {
vweb.Context
middlewares map[string][]vweb.Middleware
mut:
is_authenticated bool
}
fn main() {
mut app := new_app()
vweb.run(app, http_port)
}
fn new_app() &App {
mut app := &App{
middlewares: {
// chaining is allowed, middleware will be evaluated in order
'/admin/': [other_func1, other_func2]
'/early': [middleware_early]
}
}
// do stuff with app
// ...
return app
}
['/']
pub fn (mut app App) index() vweb.Result {
println('Index page')
title := 'Home Page'
content := $tmpl('templates/index.html')
base := $tmpl('templates/base.html')
return app.html(base)
}
[middleware: check_auth]
['/admin/secrets']
pub fn (mut app App) secrets() vweb.Result {
println('Secrets page')
title := 'Secret Admin Page'
content := $tmpl('templates/secret.html')
base := $tmpl('templates/base.html')
return app.html(base)
}
['/admin/:sub']
pub fn (mut app App) dynamic(sub string) vweb.Result {
println('Dynamic page')
title := 'Secret dynamic'
content := sub
base := $tmpl('templates/base.html')
return app.html(base)
}
['/early']
pub fn (mut app App) early() vweb.Result {
println('Early page')
title := 'Early Exit'
content := $tmpl('templates/early.html')
base := $tmpl('templates/base.html')
return app.html(base)
}
// is always executed first!
pub fn (mut app App) before_request() {
app.is_authenticated = false
println('0')
}
pub fn (mut app App) check_auth() bool {
println('3')
if app.is_authenticated == false {
app.redirect('/')
}
return app.is_authenticated
}
fn other_func1(mut ctx vweb.Context) bool {
println('1')
return true
}
fn other_func2(mut ctx vweb.Context) bool {
println('2')
// ...
return true
}
fn middleware_early(mut ctx vweb.Context) bool {
println('4')
ctx.text(':(')
// returns false, so the middleware propogation is stopped and the user will see the text ":("
return false
}