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fix panic when both handler and middlewares are nil #2500

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fix panic when both handler and middlewares are nil #2500

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16 changes: 15 additions & 1 deletion echo.go
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Expand Up @@ -575,7 +575,9 @@ func (e *Echo) File(path, file string, m ...MiddlewareFunc) *Route {

func (e *Echo) add(host, method, path string, handler HandlerFunc, middlewares ...MiddlewareFunc) *Route {
router := e.findRouter(host)
//FIXME: when handler+middleware are both nil ... make it behave like handler removal
if !e.hasValidHandlerAndMiddleware(handler, middlewares...) {
return nil
}
name := handlerName(handler)
route := router.add(method, path, name, func(c Context) error {
h := applyMiddleware(handler, middlewares...)
Expand Down Expand Up @@ -972,6 +974,18 @@ func handlerName(h HandlerFunc) string {
return t.String()
}

func (e *Echo) hasValidHandlerAndMiddleware(handler HandlerFunc, middlewares ...MiddlewareFunc) bool {
if handler == nil {
for _, middleware := range middlewares {
if middleware != nil {
return true
}
}
return false
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You mean when both of them were nil ?

Suggested change
return false
panic("can not add route with nil handler and middlewares")

}
return true
}

// // PathUnescape is wraps `url.PathUnescape`
// func PathUnescape(s string) (string, error) {
// return url.PathUnescape(s)
Expand Down