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// Copyright 2015 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/variations/net/variations_http_headers.h"
#include <stddef.h>
#include "base/macros.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_util.h"
#include "components/google/core/browser/google_util.h"
#include "components/variations/variations_http_header_provider.h"
#include "net/http/http_request_headers.h"
#include "url/gurl.h"
namespace variations {
namespace {
const char* kSuffixesToSetHeadersFor[] = {
".android.com",
".doubleclick.com",
".doubleclick.net",
".ggpht.com",
".googleadservices.com",
".googleapis.com",
".googlesyndication.com",
".googleusercontent.com",
".googlevideo.com",
".gstatic.com",
".ytimg.com",
};
// Exact hostnames in lowercase to set headers for.
const char* kHostsToSetHeadersFor[] = {
"googleweblight.com",
};
const char kChromeUMAEnabled[] = "X-Chrome-UMA-Enabled";
const char kClientData[] = "X-Client-Data";
// The result of checking if a URL should have variations headers appended.
// This enum is used to record UMA histogram values, and should not be
// reordered.
enum URLValidationResult {
INVALID_URL,
NOT_HTTPS,
NOT_GOOGLE_DOMAIN,
SHOULD_APPEND,
NEITHER_HTTP_HTTPS,
IS_GOOGLE_NOT_HTTPS,
URL_VALIDATION_RESULT_SIZE,
};
// Checks whether headers should be appended to the |url|, based on the domain
// of |url|. |url| is assumed to be valid, and to have an http/https scheme.
bool IsGoogleDomain(const GURL& url) {
if (google_util::IsGoogleDomainUrl(url, google_util::ALLOW_SUBDOMAIN,
google_util::ALLOW_NON_STANDARD_PORTS)) {
return true;
}
if (google_util::IsYoutubeDomainUrl(url, google_util::ALLOW_SUBDOMAIN,
google_util::ALLOW_NON_STANDARD_PORTS)) {
return true;
}
// Some domains don't have international TLD extensions, so testing for them
// is very straight forward.
const std::string host = url.host();
for (size_t i = 0; i < arraysize(kSuffixesToSetHeadersFor); ++i) {
if (base::EndsWith(host, kSuffixesToSetHeadersFor[i],
base::CompareCase::INSENSITIVE_ASCII))
return true;
}
for (size_t i = 0; i < arraysize(kHostsToSetHeadersFor); ++i) {
if (base::LowerCaseEqualsASCII(host, kHostsToSetHeadersFor[i]))
return true;
}
return false;
}
void LogUrlValidationHistogram(URLValidationResult result) {
UMA_HISTOGRAM_ENUMERATION("Variations.Headers.URLValidationResult", result,
URL_VALIDATION_RESULT_SIZE);
}
} // namespace
void AppendVariationHeaders(const GURL& url,
bool incognito,
bool uma_enabled,
bool is_signed_in,
net::HttpRequestHeaders* headers) {
// Note the criteria for attaching client experiment headers:
// 1. We only transmit to Google owned domains which can evaluate experiments.
// 1a. These include hosts which have a standard postfix such as:
// *.doubleclick.net or *.googlesyndication.com or
// exactly www.googleadservices.com or
// international TLD domains *.google.<TLD> or *.youtube.<TLD>.
// 2. Only transmit for non-Incognito profiles.
// 3. For the X-Chrome-UMA-Enabled bit, only set it if UMA is in fact enabled
// for this install of Chrome.
// 4. For the X-Client-Data header, only include non-empty variation IDs.
if (incognito || !internal::ShouldAppendVariationHeaders(url))
return;
if (uma_enabled)
headers->SetHeaderIfMissing(kChromeUMAEnabled, "1");
const std::string variation_ids_header =
VariationsHttpHeaderProvider::GetInstance()->GetClientDataHeader(
is_signed_in);
if (!variation_ids_header.empty()) {
// Note that prior to M33 this header was named X-Chrome-Variations.
headers->SetHeaderIfMissing(kClientData, variation_ids_header);
}
}
std::set<std::string> GetVariationHeaderNames() {
std::set<std::string> headers;
headers.insert(kChromeUMAEnabled);
headers.insert(kClientData);
return headers;
}
namespace internal {
// static
bool ShouldAppendVariationHeaders(const GURL& url) {
if (!url.is_valid()) {
LogUrlValidationHistogram(INVALID_URL);
return false;
}
if (!url.SchemeIsHTTPOrHTTPS()) {
LogUrlValidationHistogram(NEITHER_HTTP_HTTPS);
return false;
}
if (!IsGoogleDomain(url)) {
LogUrlValidationHistogram(NOT_GOOGLE_DOMAIN);
return false;
}
// We check https here, rather than before the IsGoogleDomain() check, to know
// how many Google domains are being rejected by the change to https only.
if (!url.SchemeIs("https")) {
LogUrlValidationHistogram(IS_GOOGLE_NOT_HTTPS);
return false;
}
LogUrlValidationHistogram(SHOULD_APPEND);
return true;
}
} // namespace internal
} // namespace variations
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