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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PREVIEWS_CORE_PREVIEWS_EXPERIMENTS_H_
#define COMPONENTS_PREVIEWS_CORE_PREVIEWS_EXPERIMENTS_H_
#include <string>
#include <utility>
#include <vector>
#include "base/time/time.h"
#include "net/nqe/effective_connection_type.h"
namespace previews {
enum class PreviewsType {
// Used to indicate that there is no preview type.
NONE = 0,
// The user is shown an offline page as a preview.
OFFLINE = 1,
// Replace images with placeholders.
LOFI = 2,
// The user is shown a server lite page.
LITE_PAGE = 3,
// AMP version of the page is shown as a preview. Deprecated, and should not
// be used.
DEPRECATED_AMP_REDIRECTION = 4,
// Preview that disables JavaScript for the navigation.
NOSCRIPT = 5,
// Special value that indicates that no specific type is identified. This
// might be used for checks or logging that applies to any type.
UNSPECIFIED = 6,
// Request that resource loading hints be used during pageload.
RESOURCE_LOADING_HINTS = 7,
// Insert new enum values here. Keep values sequential to allow looping from
// NONE+1 to LAST-1. Also add the enum to Previews.Types histogram suffix.
LAST = 8,
};
typedef std::vector<std::pair<PreviewsType, int>> PreviewsTypeList;
// Gets the string representation of |type|.
std::string GetStringNameForType(PreviewsType type);
namespace params {
// The maximum number of recent previews navigations the black list looks at to
// determine if a host is blacklisted.
size_t MaxStoredHistoryLengthForPerHostBlackList();
// The maximum number of recent previews navigations the black list looks at to
// determine if all previews navigations are disallowed.
size_t MaxStoredHistoryLengthForHostIndifferentBlackList();
// The maximum number of hosts allowed in the in memory black list.
size_t MaxInMemoryHostsInBlackList();
// The number of recent navigations that were opted out of for a given host that
// would trigger that host to be blacklisted.
int PerHostBlackListOptOutThreshold();
// The number of recent navigations that were opted out of that would trigger
// all previews navigations to be disallowed.
int HostIndifferentBlackListOptOutThreshold();
// The amount of time a host remains blacklisted due to opt outs.
base::TimeDelta PerHostBlackListDuration();
// The amount of time all previews navigations are disallowed due to opt outs.
base::TimeDelta HostIndifferentBlackListPerHostDuration();
// The amount of time after any opt out that no previews should be shown.
base::TimeDelta SingleOptOutDuration();
// The amount of time that an offline page is considered fresh enough to be
// shown as a preview.
base::TimeDelta OfflinePreviewFreshnessDuration();
// The threshold of EffectiveConnectionType above which preview |type| will be
// triggered.
net::EffectiveConnectionType GetECTThresholdForPreview(
previews::PreviewsType type);
// Whether any previews are allowed. Acts as a kill-switch or holdback check.
bool ArePreviewsAllowed();
// Whether the preview type is enabled.
bool IsOfflinePreviewsEnabled();
bool IsClientLoFiEnabled();
bool IsNoScriptPreviewsEnabled();
bool IsResourceLoadingHintsEnabled();
// The blacklist version for each preview type.
int OfflinePreviewsVersion();
int ClientLoFiVersion();
int NoScriptPreviewsVersion();
int ResourceLoadingHintsVersion();
// Whether server optimization hints are enabled.
bool IsOptimizationHintsEnabled();
// The threshold of EffectiveConnectionType above which Client Lo-Fi previews
// should not be served.
net::EffectiveConnectionType EffectiveConnectionTypeThresholdForClientLoFi();
// Returns the hosts that are blacklisted by the Client Lo-Fi field trial.
std::vector<std::string> GetBlackListedHostsForClientLoFiFieldTrial();
// For estimating NoScript data savings, this is the percentage factor to
// multiple by the network bytes for inflating the original_bytes count.
int NoScriptPreviewsInflationPercent();
// For estimating NoScript data savings, this is the number of bytes to
// for inflating the original_bytes count.
int NoScriptPreviewsInflationBytes();
} // namespace params
} // namespace previews
#endif // COMPONENTS_PREVIEWS_CORE_PREVIEWS_EXPERIMENTS_H_
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