Function parseLinkHeader

modules/caddyhttp/push/link.go:37–71

parseLinkHeader is responsible for parsing Link header and returning list of found resources. Accepted formats are: Link: <resource>; as=script Link: <resource>; as=script,<resource>; as=style Link: <resource>;<resource2> where <resource> begins with a forward slash (/).

(header string)

//
// where <resource> begins with a forward slash (/).
func parseLinkHeader(header string) []linkResource {
	resources := []linkResource{}

	if header == "" {
		return resources
	}

	for link := range strings.SplitSeq(header, comma) {
		l := linkResource{params: make(map[string]string)}

		li, ri := strings.Index(link, "<"), strings.Index(link, ">")
		if li == -1 || ri == -1 {
			continue
		}

		l.uri = strings.TrimSpace(link[li+1 : ri])

		for param := range strings.SplitSeq(strings.TrimSpace(link[ri+1:]), semicolon) {
			before, after, isCut := strings.Cut(strings.TrimSpace(param), equal)
			key := strings.TrimSpace(before)
			if key == "" {
				continue
			}
			if isCut {
				l.params[key] = strings.TrimSpace(after)
			} else {
				l.params[key] = key
			}
		}

		resources = append(resources, l)
	}

	return resources
}

const (
	comma     = ","