// IsRequestCacheable returs whether the client allows the requested content to
// be retrieved from the cache. True result and unlimited duration means that the
func IsRequestCacheable(req *http.Request) bool {
//!TODO: improve; implement something like github.com/pquerna/cachecontrol but better
//!TODO: write unit tests
reqDir, _ := cacheobject.ParseRequestCacheControl(req.Header.Get("Cache-Control"))
return !(reqDir.NoCache || reqDir.NoStore)
}
// CacheSatisfiesRequest returs whether the client allows the requested content
// to be retrieved from the cache and whether the cache we have is fresh enough
// to be used for handling the request.
func CacheSatisfiesRequest(obj *types.ObjectMetadata, req *http.Request) bool {
//!TODO: improve; implement something like github.com/pquerna/cachecontrol but better
//!TODO: write unit tests
//!TODO: handle cases with respect to https://tools.ietf.org/html/rfc7232
reqDir, _ := cacheobject.ParseRequestCacheControl(req.Header.Get("Cache-Control"))
return !(reqDir.NoCache || reqDir.NoStore)
}
func main() {
req, _ := http.NewRequest("GET", "http://www.example.com/", nil)
res, _ := http.DefaultClient.Do(req)
_, _ = ioutil.ReadAll(res.Body)
reqDir, _ := cacheobject.ParseRequestCacheControl(req.Header.Get("Cache-Control"))
resDir, _ := cacheobject.ParseResponseCacheControl(res.Header.Get("Cache-Control"))
expiresHeader, _ := http.ParseTime(res.Header.Get("Expires"))
dateHeader, _ := http.ParseTime(res.Header.Get("Date"))
lastModifiedHeader, _ := http.ParseTime(res.Header.Get("Last-Modified"))
obj := cacheobject.Object{
RespDirectives: resDir,
RespHeaders: res.Header,
RespStatusCode: res.StatusCode,
RespExpiresHeader: expiresHeader,
RespDateHeader: dateHeader,
RespLastModifiedHeader: lastModifiedHeader,
ReqDirectives: reqDir,
ReqHeaders: req.Header,
ReqMethod: req.Method,
NowUTC: time.Now().UTC(),
}
rv := cacheobject.ObjectResults{}
cacheobject.CachableObject(&obj, &rv)
cacheobject.ExpirationObject(&obj, &rv)
fmt.Println("Errors: ", rv.OutErr)
fmt.Println("Reasons to not cache: ", rv.OutReasons)
fmt.Println("Warning headers to add: ", rv.OutWarnings)
fmt.Println("Expiration: ", rv.OutExpirationTime.String())
}
