telebot/middleware.go

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2023-02-01 12:08:20 +03:00
package telebot
// MiddlewareFunc represents a middleware processing function,
// which get called before the endpoint group or specific handler.
type MiddlewareFunc func(HandlerFunc) HandlerFunc
func applyMiddleware(h HandlerFunc, m ...MiddlewareFunc) HandlerFunc {
for i := len(m) - 1; i >= 0; i-- {
h = m[i](h)
}
return h
}
// Group is a separated group of handlers, united by the general middleware.
type Group struct {
b *Bot
middleware []MiddlewareFunc
}
// Use adds middleware to the chain.
func (g *Group) Use(middleware ...MiddlewareFunc) {
g.middleware = append(g.middleware, middleware...)
}
// Handle adds endpoint handler to the bot, combining group's middleware
// with the optional given middleware.
func (g *Group) Handle(endpoint interface{}, h HandlerFunc, m ...MiddlewareFunc) {
g.b.Handle(endpoint, h, append(g.middleware, m...)...)
}