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feat: HTTP caching according to RFC 7234 is supported by pipeline han…
…dlers and the httpendpoint provider (#307)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package httpcache | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "bytes" | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "errors" | ||
| "net/http" | ||
| "net/http/httputil" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/pquerna/cachecontrol" | ||
|
|
||
| "github.com/dadrus/heimdall/internal/cache" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrInvalidCacheEntry = errors.New("invalid cache entry") | ||
| ErrNoCacheEntry = errors.New("no cache entry") | ||
| ) | ||
|
|
||
| type RoundTripper struct { | ||
| Transport http.RoundTripper | ||
| } | ||
|
|
||
| func (rt *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) { | ||
| resp, err := rt.cachedResponse(req) | ||
| if err == nil { | ||
| return resp, nil | ||
| } | ||
|
|
||
| resp, err = rt.Transport.RoundTrip(req) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| rt.cacheResponse(req, resp) | ||
|
|
||
| return resp, nil | ||
| } | ||
|
|
||
| func (rt *RoundTripper) cachedResponse(req *http.Request) (*http.Response, error) { | ||
| cch := cache.Ctx(req.Context()) | ||
|
|
||
| cachedValue := cch.Get(cacheKey(req)) | ||
| if cachedValue == nil { | ||
| return nil, ErrNoCacheEntry | ||
| } | ||
|
|
||
| respDump, ok := cachedValue.([]byte) | ||
| if !ok { | ||
| return nil, ErrInvalidCacheEntry | ||
| } | ||
|
|
||
| return http.ReadResponse(bufio.NewReader(bytes.NewReader(respDump)), req) | ||
| } | ||
|
|
||
| func (rt *RoundTripper) cacheResponse(req *http.Request, resp *http.Response) { | ||
| defaultExpirationTime := time.Time{} | ||
|
|
||
| reasons, expires, err := cachecontrol.CachableResponse(req, resp, cachecontrol.Options{PrivateCache: true}) | ||
| if err != nil || len(reasons) != 0 || expires == defaultExpirationTime { | ||
| return | ||
| } | ||
|
|
||
| respDump, err := httputil.DumpResponse(resp, true) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| cch := cache.Ctx(req.Context()) | ||
| cch.Set(cacheKey(req), respDump, time.Until(expires)) | ||
| } | ||
|
|
||
| func cacheKey(req *http.Request) string { | ||
| hash := sha256.New() | ||
|
|
||
| hash.Write([]byte("RFC 7234")) | ||
| hash.Write([]byte(req.URL.String())) | ||
| hash.Write([]byte(req.Method)) | ||
|
|
||
| value := req.Header.Get("Authorization") | ||
| if len(value) != 0 { | ||
| hash.Write([]byte(strings.TrimSpace(value))) | ||
| } | ||
|
|
||
| return hex.EncodeToString(hash.Sum(nil)) | ||
| } |
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