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// Copyright 2014 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.
#include "components/search/search.h"
#include <stddef.h>
#include "base/metrics/field_trial.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "components/google/core/browser/google_util.h"
#include "components/search_engines/template_url.h"
#include "url/gurl.h"
namespace search {
namespace {
// Configuration options for Embedded Search.
// EmbeddedSearch field trials are named in such a way that we can parse out
// the experiment configuration from the trial's group name in order to give
// us maximum flexability in running experiments.
// Field trial groups should be named things like "Group7 espv:2 instant:1".
// The first token is always GroupN for some integer N, followed by a
// space-delimited list of key:value pairs which correspond to these flags:
const char kEmbeddedPageVersionFlagName[] = "espv";
#if defined(OS_IOS) || defined(OS_ANDROID)
const uint64_t kEmbeddedPageVersionDefault = 1;
#else
const uint64_t kEmbeddedPageVersionDefault = 2;
#endif
// Constants for the field trial name and group prefix.
// Note in M30 and below this field trial was named "InstantExtended" and in
// M31 was renamed to EmbeddedSearch for clarity and cleanliness. Since we
// can't easilly sync up Finch configs with the pushing of this change to
// Dev & Canary, for now the code accepts both names.
// TODO(dcblack): Remove the InstantExtended name once M31 hits the Beta
// channel.
const char kInstantExtendedFieldTrialName[] = "InstantExtended";
const char kEmbeddedSearchFieldTrialName[] = "EmbeddedSearch";
// If the field trial's group name ends with this string its configuration will
// be ignored and Instant Extended will not be enabled by default.
const char kDisablingSuffix[] = "DISABLED";
} // namespace
bool IsInstantExtendedAPIEnabled() {
#if defined(OS_IOS) || defined(OS_ANDROID)
return false;
#else
return true;
#endif
}
// Determine what embedded search page version to request from the user's
// default search provider. If 0, the embedded search UI should not be enabled.
uint64_t EmbeddedSearchPageVersion() {
FieldTrialFlags flags;
if (GetFieldTrialInfo(&flags)) {
return GetUInt64ValueForFlagWithDefault(kEmbeddedPageVersionFlagName,
kEmbeddedPageVersionDefault,
flags);
}
return kEmbeddedPageVersionDefault;
}
bool GetFieldTrialInfo(FieldTrialFlags* flags) {
// Get the group name. If the EmbeddedSearch trial doesn't exist, look for
// the older InstantExtended name.
std::string group_name = base::FieldTrialList::FindFullName(
kEmbeddedSearchFieldTrialName);
if (group_name.empty()) {
group_name = base::FieldTrialList::FindFullName(
kInstantExtendedFieldTrialName);
}
if (base::EndsWith(group_name, kDisablingSuffix,
base::CompareCase::SENSITIVE))
return false;
// We have a valid trial that isn't disabled. Extract the flags.
std::string group_prefix(group_name);
size_t first_space = group_name.find(" ");
if (first_space != std::string::npos) {
// There is a flags section of the group name. Split that out and parse it.
group_prefix = group_name.substr(0, first_space);
if (!base::SplitStringIntoKeyValuePairs(group_name.substr(first_space),
':', ' ', flags)) {
// Failed to parse the flags section. Assume the whole group name is
// invalid.
return false;
}
}
return true;
}
// Given a FieldTrialFlags object, returns the uint64_t value of the provided
// flag.
uint64_t GetUInt64ValueForFlagWithDefault(const std::string& flag,
uint64_t default_value,
const FieldTrialFlags& flags) {
for (const std::pair<std::string, std::string>& flag_and_value : flags) {
if (flag_and_value.first == flag) {
const std::string& str_value = flag_and_value.second;
uint64_t value;
if (base::StringToUint64(str_value, &value))
return value;
}
}
return default_value;
}
std::string InstantExtendedEnabledParam() {
return std::string(google_util::kInstantExtendedAPIParam) + "=" +
base::Uint64ToString(EmbeddedSearchPageVersion()) + "&";
}
std::string ForceInstantResultsParam(bool for_prerender) {
return (for_prerender || !IsInstantExtendedAPIEnabled()) ? "ion=1&"
: std::string();
}
} // namespace search
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