// setAllowHeader builds a Allow header based on the resource configuration.
func setAllowHeader(headers http.Header, isItem bool, conf resource.Conf) {
methods := []string{}
if isItem {
// Methods are sorted
if conf.IsModeAllowed(resource.Update) {
methods = append(methods, "DELETE")
}
if conf.IsModeAllowed(resource.Read) {
methods = append(methods, "GET, HEAD")
}
if conf.IsModeAllowed(resource.Update) {
methods = append(methods, "PATCH")
// See http://tools.ietf.org/html/rfc5789#section-3
headers.Set("Allow-Patch", "application/json")
}
if conf.IsModeAllowed(resource.Create) || conf.IsModeAllowed(resource.Replace) {
methods = append(methods, "PUT")
}
} else {
// Methods are sorted
if conf.IsModeAllowed(resource.Clear) {
methods = append(methods, "DELETE")
}
if conf.IsModeAllowed(resource.List) {
methods = append(methods, "GET, HEAD")
}
if conf.IsModeAllowed(resource.Create) {
methods = append(methods, "POST")
}
}
if len(methods) > 0 {
headers.Set("Allow", strings.Join(methods, ", "))
}
}
// isMethodAllowed returns true if the method is allowed by the configuration
func isMethodAllowed(isItem bool, method string, conf resource.Conf) bool {
if isItem {
switch method {
case http.MethodOptions:
return true
case http.MethodHead, http.MethodGet:
return conf.IsModeAllowed(resource.Read)
case http.MethodPut:
return conf.IsModeAllowed(resource.Create) || conf.IsModeAllowed(resource.Replace)
case http.MethodPatch:
return conf.IsModeAllowed(resource.Update)
case http.MethodDelete:
return conf.IsModeAllowed(resource.Delete)
}
} else {
switch method {
case http.MethodOptions:
return true
case http.MethodHead, http.MethodGet:
return conf.IsModeAllowed(resource.List)
case http.MethodPost:
return conf.IsModeAllowed(resource.Create)
case http.MethodDelete:
return conf.IsModeAllowed(resource.Clear)
}
}
return false
}