Fix the build with newer clang and other custom configuration options
[WebKit-https.git] / Source / WebKit2 / Shared / mac / CookieStorageShimLibrary.cpp
1 /*
2  * Copyright (C) 2013 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 #include "config.h"
27 #include "CookieStorageShimLibrary.h"
28
29 #if !PLATFORM(IOS)
30
31 #include <WebCore/DynamicLinkerInterposing.h>
32 #include <mutex>
33
34 extern "C" CFDictionaryRef _CFHTTPCookieStorageCopyRequestHeaderFieldsForURL(CFAllocatorRef inAllocator, CFHTTPCookieStorageRef inCookieStorage, CFURLRef inRequestURL);
35
36 namespace WebKit {
37
38 extern "C" void WebKitCookieStorageShimInitialize(const CookieStorageShimCallbacks&);
39
40 static CookieStorageShimCallbacks cookieStorageShimCallbacks;
41
42 class ShimProtector {
43 public:
44     ShimProtector() { ++m_count; }
45     ~ShimProtector() { --m_count; }
46     static unsigned count() { return m_count; }
47 private:
48     __thread static unsigned m_count;
49 };
50
51 __thread unsigned ShimProtector::m_count = 0;
52
53 static CFDictionaryRef shimCFHTTPCookieStorageCopyRequestHeaderFieldsForURL(CFAllocatorRef inAllocator, CFHTTPCookieStorageRef inCookieStorage, CFURLRef inRequestURL)
54 {
55     ShimProtector protector;
56
57     do {
58         // Protect against uninitialized callbacks:
59         if (!cookieStorageShimCallbacks.cookieStorageCopyRequestHeaderFieldsForURL)
60             break;
61
62         // Protect against accidental recursion:
63         if (ShimProtector::count() > 1)
64             break;
65
66         CFDictionaryRef results = cookieStorageShimCallbacks.cookieStorageCopyRequestHeaderFieldsForURL(inCookieStorage, inRequestURL);
67         if (!results)
68             break;
69
70         return results;
71     } while (0);
72
73     // If we've failed to retrieve the cookies manually, fall back to the original imposed function:
74     return _CFHTTPCookieStorageCopyRequestHeaderFieldsForURL(inAllocator, inCookieStorage, inRequestURL);
75 }
76
77 DYLD_INTERPOSE(shimCFHTTPCookieStorageCopyRequestHeaderFieldsForURL, _CFHTTPCookieStorageCopyRequestHeaderFieldsForURL);
78
79 __attribute__((visibility("default")))
80 void WebKitCookieStorageShimInitialize(const CookieStorageShimCallbacks& callbacks)
81 {
82     // Because the value of cookieStorageShimCallbacks will be read from mulitple threads,
83     // only allow it to be initialized once.
84     static std::once_flag initializeCallbacksOnceFlag;
85     std::call_once(initializeCallbacksOnceFlag, [&callbacks] { cookieStorageShimCallbacks = callbacks; });
86 }
87     
88 }
89
90 #endif // !PLATFORM(IOS)