1/*
2 * Copyright (C) 2014 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#import "config.h"
27#import "UserAgent.h"
28
29#import "SystemVersion.h"
30
31namespace WebCore {
32
33String systemMarketingVersionForUserAgentString()
34{
35    // Use underscores instead of dots because when we first added the Mac OS X version to the user agent string
36    // we were concerned about old DHTML libraries interpreting "4." as Netscape 4. That's no longer a concern for us
37    // but we're sticking with the underscores for compatibility with the format used by older versions of Safari.
38    return [systemMarketingVersion() stringByReplacingOccurrencesOfString:@"." withString:@"_"];
39}
40
41static NSString *userVisibleWebKitBundleVersionFromFullVersion(NSString *fullWebKitVersion)
42{
43    // If the version is longer than 3 digits then the leading digits represent the version of the OS. Our user agent
44    // string should not include the leading digits, so strip them off and report the rest as the version. <rdar://problem/4997547>
45    NSRange nonDigitRange = [fullWebKitVersion rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]];
46    if (nonDigitRange.location == NSNotFound && fullWebKitVersion.length > 3)
47        return [fullWebKitVersion substringFromIndex:fullWebKitVersion.length - 3];
48    if (nonDigitRange.location != NSNotFound && nonDigitRange.location > 3)
49        return [fullWebKitVersion substringFromIndex:nonDigitRange.location - 3];
50    return fullWebKitVersion;
51}
52
53String userAgentBundleVersionFromFullVersionString(const String& fullWebKitVersion)
54{
55    // We include at most three components of the bundle version in the user agent string.
56    NSString *bundleVersion = userVisibleWebKitBundleVersionFromFullVersion(fullWebKitVersion);
57    NSScanner *scanner = [NSScanner scannerWithString:bundleVersion];
58    NSInteger periodCount = 0;
59    while (true) {
60        if (![scanner scanUpToString:@"." intoString:nullptr] || scanner.isAtEnd)
61            return bundleVersion;
62
63        if (++periodCount == 3)
64            return [bundleVersion substringToIndex:scanner.scanLocation];
65
66        ++scanner.scanLocation;
67    }
68
69    ASSERT_NOT_REACHED();
70}
71
72} // namespace WebCore
73