static IEnumerable<string> CacheRevalidation(CacheProxyAttribute proxy, CacheBrowserAttribute browser)
{
if (proxy != null && proxy.MustRevalidate && browser != null && browser.MustRevalidate)
yield return "must-revalidate";
else if (proxy != null && proxy.MustRevalidate)
yield return "proxy-revalidate";
}
static IEnumerable<string> CacheVisibility(CacheProxyAttribute proxy, CacheBrowserAttribute browser)
{
if (proxy == null && browser == null)
yield break;
if (proxy != null && proxy.Level == ProxyCacheLevel.Everything)
yield return "public";
else if ((proxy == null || proxy.Level == ProxyCacheLevel.None) &&
(browser == null || browser.Level == BrowserCacheLevel.Default))
yield return "private";
else if (proxy != null && browser != null && proxy.Level == ProxyCacheLevel.None && browser.Level == BrowserCacheLevel.None)
yield return "no-cache";
}
public bool BeforeExecute(IOperation operation)
{
_proxy = operation.FindAttribute<CacheProxyAttribute>();
_browser = operation.FindAttribute<CacheBrowserAttribute>();
_server = operation.FindAttribute<CacheServerAttribute>();
var cacheEntry = TryGetValidCacheEntry(_request.Uri.AbsolutePath);
if (cacheEntry != null)
{
_cachedValue = cacheEntry.Value;
}
return true;
}
static IEnumerable<string> CacheMaxAge(CacheProxyAttribute proxy, CacheBrowserAttribute browser)
{
TimeSpan proxyAge = TimeSpan.MinValue, browserAge = TimeSpan.MinValue;
if (proxy != null && proxy.MaxAge != null) TimeSpan.TryParse(proxy.MaxAge, out proxyAge);
if (browser != null && browser.MaxAge != null) TimeSpan.TryParse(browser.MaxAge, out browserAge);
if (proxyAge == TimeSpan.MinValue && browserAge == TimeSpan.MinValue)
yield break;
if (proxyAge != TimeSpan.MinValue && browserAge != TimeSpan.MinValue)
yield return "s-max-age=" + proxyAge.TotalSeconds;
yield return "max-age=" + (proxyAge != TimeSpan.MinValue
? proxyAge.TotalSeconds
: browserAge.TotalSeconds);
}
public static ResponseCachingState GetResponseDirective(
CacheProxyAttribute proxy,
CacheBrowserAttribute browser,
CacheServerAttribute server)
{
ValidateProxyAttribute(proxy);
var instructions = CacheVisibility(proxy, browser)
.Concat(CacheRevalidation(proxy, browser))
.Concat(CacheMaxAge(proxy, browser));
var response = new ResponseCachingState(instructions);
// SetupLocalCaching(proxy, response);
return response;
}
