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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/google/core/browser/google_util.h"
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/strings/string16.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "components/google/core/browser/google_switches.h"
#include "components/google/core/browser/google_url_tracker.h"
#include "components/url_fixer/url_fixer.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "net/base/url_util.h"
#include "url/gurl.h"
// Only use Link Doctor on official builds. It uses an API key, too, but
// seems best to just disable it, for more responsive error pages and to reduce
// server load.
#if defined(GOOGLE_CHROME_BUILD)
#define LINKDOCTOR_SERVER_REQUEST_URL "https://www.googleapis.com/rpc"
#else
#define LINKDOCTOR_SERVER_REQUEST_URL ""
#endif
// Helpers --------------------------------------------------------------------
namespace {
bool gUseMockLinkDoctorBaseURLForTesting = false;
bool IsPathHomePageBase(const std::string& path) {
return (path == "/") || (path == "/webhp");
}
// True if |host| is "[www.]<domain_in_lower_case>.<TLD>" with a valid TLD. If
// |subdomain_permission| is ALLOW_SUBDOMAIN, we check against host
// "*.<domain_in_lower_case>.<TLD>" instead.
bool IsValidHostName(const std::string& host,
const std::string& domain_in_lower_case,
google_util::SubdomainPermission subdomain_permission) {
size_t tld_length = net::registry_controlled_domains::GetRegistryLength(
host,
net::registry_controlled_domains::EXCLUDE_UNKNOWN_REGISTRIES,
net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
if ((tld_length == 0) || (tld_length == std::string::npos))
return false;
// Removes the tld and the preceding dot.
std::string host_minus_tld(host, 0, host.length() - tld_length - 1);
if (base::LowerCaseEqualsASCII(host_minus_tld, domain_in_lower_case.c_str()))
return true;
if (subdomain_permission == google_util::ALLOW_SUBDOMAIN)
return base::EndsWith(host_minus_tld, "." + domain_in_lower_case,
base::CompareCase::INSENSITIVE_ASCII);
return base::LowerCaseEqualsASCII(host_minus_tld,
("www." + domain_in_lower_case).c_str());
}
// True if |url| is a valid URL with HTTP or HTTPS scheme. If |port_permission|
// is DISALLOW_NON_STANDARD_PORTS, this also requires |url| to use the standard
// port for its scheme (80 for HTTP, 443 for HTTPS).
bool IsValidURL(const GURL& url, google_util::PortPermission port_permission) {
return url.is_valid() && url.SchemeIsHTTPOrHTTPS() &&
(url.port().empty() ||
(port_permission == google_util::ALLOW_NON_STANDARD_PORTS));
}
} // namespace
namespace google_util {
// Global functions -----------------------------------------------------------
bool HasGoogleSearchQueryParam(const std::string& str) {
url::Component query(0, static_cast<int>(str.length())), key, value;
while (url::ExtractQueryKeyValue(str.c_str(), &query, &key, &value)) {
if (value.is_nonempty()) {
base::StringPiece key_str(&str[key.begin], key.len);
if (key_str == "q" || key_str == "as_q")
return true;
}
}
return false;
}
GURL LinkDoctorBaseURL() {
if (gUseMockLinkDoctorBaseURLForTesting)
return GURL("http://mock.linkdoctor.url/for?testing");
return GURL(LINKDOCTOR_SERVER_REQUEST_URL);
}
void SetMockLinkDoctorBaseURLForTesting() {
gUseMockLinkDoctorBaseURLForTesting = true;
}
std::string GetGoogleLocale(const std::string& application_locale) {
// Google does not recognize "nb" for Norwegian Bokmal; it uses "no".
return (application_locale == "nb") ? "no" : application_locale;
}
GURL AppendGoogleLocaleParam(const GURL& url,
const std::string& application_locale) {
return net::AppendQueryParameter(
url, "hl", GetGoogleLocale(application_locale));
}
std::string GetGoogleCountryCode(GURL google_homepage_url) {
const std::string google_hostname = google_homepage_url.host();
const size_t last_dot = google_hostname.find_last_of('.');
if (last_dot == std::string::npos) {
NOTREACHED();
}
std::string country_code = google_hostname.substr(last_dot + 1);
// Assume the com TLD implies the US.
if (country_code == "com")
return "us";
// Google uses the Unicode Common Locale Data Repository (CLDR), and the CLDR
// code for the UK is "gb".
if (country_code == "uk")
return "gb";
// Catalonia does not have a CLDR country code, since it's a region in Spain,
// so use Spain instead.
if (country_code == "cat")
return "es";
return country_code;
}
GURL GetGoogleSearchURL(GURL google_homepage_url) {
// To transform the homepage URL into the corresponding search URL, add the
// "search" and the "q=" query string.
GURL::Replacements replacements;
replacements.SetPathStr("search");
replacements.SetQueryStr("q=");
return google_homepage_url.ReplaceComponents(replacements);
}
GURL CommandLineGoogleBaseURL() {
// Unit tests may add command-line flags after the first call to this
// function, so we don't simply initialize a static |base_url| directly and
// then unconditionally return it.
CR_DEFINE_STATIC_LOCAL(std::string, switch_value, ());
CR_DEFINE_STATIC_LOCAL(GURL, base_url, ());
std::string current_switch_value(
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kGoogleBaseURL));
if (current_switch_value != switch_value) {
switch_value = current_switch_value;
base_url = url_fixer::FixupURL(switch_value, std::string());
if (!base_url.is_valid() || base_url.has_query() || base_url.has_ref())
base_url = GURL();
}
return base_url;
}
bool StartsWithCommandLineGoogleBaseURL(const GURL& url) {
GURL base_url(CommandLineGoogleBaseURL());
return base_url.is_valid() &&
base::StartsWith(url.possibly_invalid_spec(), base_url.spec(),
base::CompareCase::SENSITIVE);
}
bool IsGoogleHostname(const std::string& host,
SubdomainPermission subdomain_permission) {
GURL base_url(CommandLineGoogleBaseURL());
if (base_url.is_valid() && (host == base_url.host()))
return true;
return IsValidHostName(host, "google", subdomain_permission);
}
bool IsGoogleDomainUrl(const GURL& url,
SubdomainPermission subdomain_permission,
PortPermission port_permission) {
return IsValidURL(url, port_permission) &&
IsGoogleHostname(url.host(), subdomain_permission);
}
bool IsGoogleHomePageUrl(const GURL& url) {
// First check to see if this has a Google domain.
if (!IsGoogleDomainUrl(url, DISALLOW_SUBDOMAIN, DISALLOW_NON_STANDARD_PORTS))
return false;
// Make sure the path is a known home page path.
std::string path(url.path());
return IsPathHomePageBase(path) ||
base::StartsWith(path, "/ig", base::CompareCase::INSENSITIVE_ASCII);
}
bool IsGoogleSearchUrl(const GURL& url) {
// First check to see if this has a Google domain.
if (!IsGoogleDomainUrl(url, DISALLOW_SUBDOMAIN, DISALLOW_NON_STANDARD_PORTS))
return false;
// Make sure the path is a known search path.
std::string path(url.path());
bool is_home_page_base = IsPathHomePageBase(path);
if (!is_home_page_base && (path != "/search"))
return false;
// Check for query parameter in URL parameter and hash fragment, depending on
// the path type.
return HasGoogleSearchQueryParam(url.ref()) ||
(!is_home_page_base && HasGoogleSearchQueryParam(url.query()));
}
bool IsYoutubeDomainUrl(const GURL& url,
SubdomainPermission subdomain_permission,
PortPermission port_permission) {
return IsValidURL(url, port_permission) &&
IsValidHostName(url.host(), "youtube", subdomain_permission);
}
} // namespace google_util
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