Function notFoundSearchPaths

fileserver/fileserver.go:268–283

Given a path and a "not found" over-ride specification, return an array of over-ride paths that should be considered for serving, in priority order. We assume that path is a sub-path above a certain root, and we never return paths that would fall outside this. We also sanity check file extensions t

(pth string, spec string)

// type matches what we serve. This prevents an over-ride for *.html files from
// serving up data when, say, a missing .png is requested.
func notFoundSearchPaths(pth string, spec string) []string {
	var ret []string
	if strings.HasPrefix(spec, "/") {
		ret = []string{path.Clean(spec)}
	} else {
		for {
			pth = path.Dir(pth)
			if pth == "/" {
				ret = append(ret, path.Join(pth, spec))
				break
			}
			ret = append(ret, path.Join(pth, spec))
		}
	}
	return ret
}

// Get the media type for an extension, via a MIME lookup, defaulting to
// "text/html".