mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-30 09:41:11 -05:00
50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
|
package chi
|
||
|
|
|
||
|
|
import "net/http"
|
||
|
|
|
||
|
|
// Chain returns a Middlewares type from a slice of middleware handlers.
|
||
|
|
func Chain(middlewares ...func(http.Handler) http.Handler) Middlewares {
|
||
|
|
return Middlewares(middlewares)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Handler builds and returns a http.Handler from the chain of middlewares,
|
||
|
|
// with `h http.Handler` as the final handler.
|
||
|
|
func (mws Middlewares) Handler(h http.Handler) http.Handler {
|
||
|
|
return &ChainHandler{mws, h, chain(mws, h)}
|
||
|
|
}
|
||
|
|
|
||
|
|
// HandlerFunc builds and returns a http.Handler from the chain of middlewares,
|
||
|
|
// with `h http.Handler` as the final handler.
|
||
|
|
func (mws Middlewares) HandlerFunc(h http.HandlerFunc) http.Handler {
|
||
|
|
return &ChainHandler{mws, h, chain(mws, h)}
|
||
|
|
}
|
||
|
|
|
||
|
|
// ChainHandler is a http.Handler with support for handler composition and
|
||
|
|
// execution.
|
||
|
|
type ChainHandler struct {
|
||
|
|
Middlewares Middlewares
|
||
|
|
Endpoint http.Handler
|
||
|
|
chain http.Handler
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *ChainHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||
|
|
c.chain.ServeHTTP(w, r)
|
||
|
|
}
|
||
|
|
|
||
|
|
// chain builds a http.Handler composed of an inline middleware stack and endpoint
|
||
|
|
// handler in the order they are passed.
|
||
|
|
func chain(middlewares []func(http.Handler) http.Handler, endpoint http.Handler) http.Handler {
|
||
|
|
// Return ahead of time if there aren't any middlewares for the chain
|
||
|
|
if len(middlewares) == 0 {
|
||
|
|
return endpoint
|
||
|
|
}
|
||
|
|
|
||
|
|
// Wrap the end handler with the middleware chain
|
||
|
|
h := middlewares[len(middlewares)-1](endpoint)
|
||
|
|
for i := len(middlewares) - 2; i >= 0; i-- {
|
||
|
|
h = middlewares[i](h)
|
||
|
|
}
|
||
|
|
|
||
|
|
return h
|
||
|
|
}
|