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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIA_CACHE_UTIL_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIA_CACHE_UTIL_H_
#include <stdint.h>
#include "base/time/time.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace blink {
class WebURLResponse;
// Reasons that a cached WebURLResponse will *not* prevent a future request to
// the server. Reported via UMA, so don't change/reuse previously-existing
// values.
enum UncacheableReason {
kNoData = 1 << 0, // Not 200 or 206.
kPre11PartialResponse = 1 << 1, // 206 but HTTP version < 1.1.
kNoStrongValidatorOnPartialResponse = 1 << 2, // 206, no strong validator.
kShortMaxAge = 1 << 3, // Max age less than 1h (arbitrary value).
kExpiresTooSoon = 1 << 4, // Expires in less than 1h (arbitrary value).
kHasMustRevalidate = 1 << 5, // Response asks for revalidation.
kNoCache = 1 << 6, // Response included a no-cache header.
kNoStore = 1 << 7, // Response included a no-store header.
kMaxReason // Needs to be one more than max legitimate reason.
};
// Return the logical OR of the reasons "response" cannot be used for a future
// request (using the disk cache), or 0 if it might be useful.
PLATFORM_EXPORT uint32_t
GetReasonsForUncacheability(const WebURLResponse& response);
// Returns when we should evict data from this response from our
// memory cache. Note that we may still cache data longer if
// a audio/video tag is currently using it. Returns a TimeDelta
// which is should be added to base::Time::Now() or base::TimeTicks::Now().
PLATFORM_EXPORT base::TimeDelta GetCacheValidUntil(
const WebURLResponse& response);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIA_CACHE_UTIL_H_
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