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      1 /*
      2  * Copyright (C) 2009 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef ThreadableLoader_h
     32 #define ThreadableLoader_h
     33 
     34 #include "core/fetch/ResourceLoaderOptions.h"
     35 #include "wtf/Noncopyable.h"
     36 #include "wtf/PassRefPtr.h"
     37 #include "wtf/RefPtr.h"
     38 
     39 namespace WebCore {
     40 
     41     class ResourceError;
     42     class ResourceRequest;
     43     class ResourceResponse;
     44     class ExecutionContext;
     45     class ThreadableLoaderClient;
     46 
     47     enum CrossOriginRequestPolicy {
     48         DenyCrossOriginRequests,
     49         UseAccessControl,
     50         AllowCrossOriginRequests
     51     };
     52 
     53     enum PreflightPolicy {
     54         ConsiderPreflight,
     55         ForcePreflight,
     56         PreventPreflight
     57     };
     58 
     59     enum ContentSecurityPolicyEnforcement {
     60         EnforceConnectSrcDirective,
     61         DoNotEnforceContentSecurityPolicy,
     62     };
     63 
     64     struct ThreadableLoaderOptions : public ResourceLoaderOptions {
     65         ThreadableLoaderOptions()
     66             : preflightPolicy(ConsiderPreflight)
     67             , crossOriginRequestPolicy(DenyCrossOriginRequests)
     68             , contentSecurityPolicyEnforcement(EnforceConnectSrcDirective)
     69             , timeoutMilliseconds(0) { }
     70 
     71         PreflightPolicy preflightPolicy; // If AccessControl is used, how to determine if a preflight is needed.
     72         CrossOriginRequestPolicy crossOriginRequestPolicy;
     73         AtomicString initiator;
     74         ContentSecurityPolicyEnforcement contentSecurityPolicyEnforcement;
     75         unsigned long timeoutMilliseconds;
     76     };
     77 
     78     // Useful for doing loader operations from any thread (not threadsafe,
     79     // just able to run on threads other than the main thread).
     80     class ThreadableLoader {
     81         WTF_MAKE_NONCOPYABLE(ThreadableLoader);
     82     public:
     83         static void loadResourceSynchronously(ExecutionContext*, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&);
     84         static PassRefPtr<ThreadableLoader> create(ExecutionContext*, ThreadableLoaderClient*, const ResourceRequest&, const ThreadableLoaderOptions&);
     85 
     86         virtual void cancel() = 0;
     87         void ref() { refThreadableLoader(); }
     88         void deref() { derefThreadableLoader(); }
     89 
     90     protected:
     91         ThreadableLoader() { }
     92         virtual ~ThreadableLoader() { }
     93         virtual void refThreadableLoader() = 0;
     94         virtual void derefThreadableLoader() = 0;
     95     };
     96 
     97 } // namespace WebCore
     98 
     99 #endif // ThreadableLoader_h
    100