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/*
* Copyright (C) 2012, 2014, 2016 Igalia S.L.
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "UserAgent.h"
#include "HTTPParsers.h"
#include "UserAgentQuirks.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/URL.h>
#include <wtf/glib/ChassisType.h>
#include <wtf/text/StringBuilder.h>
#if OS(UNIX)
#include <sys/utsname.h>
#endif
// WARNING! WARNING! WARNING!
//
// The user agent is ludicrously fragile. The most innocent change can
// and will break websites. Read the git log for this file carefully
// before changing user agent construction. You have been warned.
namespace WebCore {
static const char* platformForUAString()
{
#if OS(MACOS)
return "Macintosh";
#else
if (chassisType() == WTF::ChassisType::Mobile)
return "Linux";
return "X11";
#endif
}
static const String platformVersionForUAString()
{
#if OS(UNIX)
if (chassisType() == WTF::ChassisType::Mobile)
return "like Android 4.4"_s;
struct utsname name;
uname(&name);
static NeverDestroyed<const String> uaOSVersion(makeString(name.sysname, ' ', name.machine));
return uaOSVersion;
#else
// We will always claim to be Safari in Intel Mac OS X, since Safari without
// OS X or anything on ARM triggers mobile versions of some websites.
static NeverDestroyed<const String> uaOSVersion(MAKE_STATIC_STRING_IMPL("Intel Mac OS X 10_13_4"));
return uaOSVersion;
#endif
}
static String buildUserAgentString(const UserAgentQuirks& quirks)
{
StringBuilder uaString;
uaString.append("Mozilla/5.0 (");
if (quirks.contains(UserAgentQuirks::NeedsMacintoshPlatform))
uaString.append(UserAgentQuirks::stringForQuirk(UserAgentQuirks::NeedsMacintoshPlatform));
else {
uaString.append(platformForUAString(), "; ");
#if defined(USER_AGENT_BRANDING)
uaString.append(USER_AGENT_BRANDING "; ");
#endif
uaString.append(platformVersionForUAString());
}
if (quirks.contains(UserAgentQuirks::NeedsFirefoxBrowser)) {
uaString.append(UserAgentQuirks::stringForQuirk(UserAgentQuirks::NeedsFirefoxBrowser));
return uaString.toString();
}
uaString.append(") AppleWebKit/605.1.15 (KHTML, like Gecko) ");
// Note that Chrome UAs advertise *both* Chrome/X and Safari/X, but it does
// not advertise Version/X.
if (quirks.contains(UserAgentQuirks::NeedsChromeBrowser)) {
uaString.append(UserAgentQuirks::stringForQuirk(UserAgentQuirks::NeedsChromeBrowser), ' ');
// Version/X is mandatory *before* Safari/X to be a valid Safari UA. See
// https://bugs.webkit.org/show_bug.cgi?id=133403 for details.
} else
uaString.append("Version/17.0 ");
if (chassisType() == WTF::ChassisType::Mobile)
uaString.append("Mobile ");
uaString.append("Safari/605.1.15");
return uaString.toString();
}
static const String standardUserAgentStatic()
{
static NeverDestroyed<const String> uaStatic(buildUserAgentString(UserAgentQuirks()));
return uaStatic;
}
String standardUserAgent(const String& applicationName, const String& applicationVersion)
{
// Create a default user agent string with a liberal interpretation of
// https://developer.mozilla.org/en-US/docs/User_Agent_Strings_Reference
//
// Forming a functional user agent is really difficult. We must mention Safari, because some
// sites check for that when detecting WebKit browsers. Additionally some sites assume that
// browsers that are "Safari" but not running on OS X are the Safari iOS browser. Getting this
// wrong can cause sites to load the wrong JavaScript, CSS, or custom fonts. In some cases
// sites won't load resources at all.
String userAgent;
if (applicationName.isEmpty()) {
userAgent = standardUserAgentStatic();
} else {
String finalApplicationVersion = applicationVersion;
if (finalApplicationVersion.isEmpty())
finalApplicationVersion = "605.1.15"_s;
userAgent = standardUserAgentStatic() + ' ' + applicationName + '/' + finalApplicationVersion;
}
static bool checked = false;
if (!checked) {
// For release builds, we'll only check the first resource load, mainly to ensure that any
// configured application details or user agent branding is OK.
RELEASE_ASSERT_WITH_MESSAGE(isValidUserAgentHeaderValue(userAgent), "%s is not a valid user agent header", userAgent.utf8().data());
checked = true;
}
ASSERT(isValidUserAgentHeaderValue(userAgent));
return userAgent;
}
String standardUserAgentForURL(const URL& url)
{
auto quirks = UserAgentQuirks::quirksForURL(url);
// The null string means we don't need a specific UA for the given URL.
// Note: UserAgentQuirks::NeedsUnbrandedUserAgent is implemented by simply
// not returning here.
if (quirks.isEmpty())
return String();
String userAgent(buildUserAgentString(quirks));
ASSERT(isValidUserAgentHeaderValue(userAgent));
return userAgent;
}
} // namespace WebCore
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