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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/RefCounted.h"
     38 #include "wtf/RefPtr.h"
     39 
     40 namespace WebCore {
     41 
     42     class ResourceError;
     43     class ResourceRequest;
     44     class ResourceResponse;
     45     class ExecutionContext;
     46     class ThreadableLoaderClient;
     47 
     48     enum CrossOriginRequestPolicy {
     49         DenyCrossOriginRequests,
     50         UseAccessControl,
     51         AllowCrossOriginRequests
     52     };
     53 
     54     enum PreflightPolicy {
     55         ConsiderPreflight,
     56         ForcePreflight,
     57         PreventPreflight
     58     };
     59 
     60     enum ContentSecurityPolicyEnforcement {
     61         EnforceConnectSrcDirective,
     62         DoNotEnforceContentSecurityPolicy,
     63     };
     64 
     65     struct ThreadableLoaderOptions {
     66         ThreadableLoaderOptions()
     67             : preflightPolicy(ConsiderPreflight)
     68             , crossOriginRequestPolicy(DenyCrossOriginRequests)
     69             , contentSecurityPolicyEnforcement(EnforceConnectSrcDirective)
     70             , timeoutMilliseconds(0) { }
     71 
     72         PreflightPolicy preflightPolicy; // If AccessControl is used, how to determine if a preflight is needed.
     73         CrossOriginRequestPolicy crossOriginRequestPolicy;
     74         AtomicString initiator;
     75         ContentSecurityPolicyEnforcement contentSecurityPolicyEnforcement;
     76         unsigned long timeoutMilliseconds;
     77     };
     78 
     79     // Useful for doing loader operations from any thread (not threadsafe,
     80     // just able to run on threads other than the main thread).
     81     class ThreadableLoader : public RefCounted<ThreadableLoader> {
     82         WTF_MAKE_NONCOPYABLE(ThreadableLoader);
     83     public:
     84         // ThreadableLoaderOptions argument configures this ThreadableLoader's
     85         // behavior.
     86         //
     87         // ResourceLoaderOptions argument will be passed to the FetchRequest
     88         // that this ThreadableLoader creates. It can be altered e.g. when
     89         // redirect happens.
     90         static void loadResourceSynchronously(ExecutionContext&, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
     91         static PassRefPtr<ThreadableLoader> create(ExecutionContext&, ThreadableLoaderClient*, const ResourceRequest&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
     92 
     93         virtual void cancel() = 0;
     94 
     95         virtual ~ThreadableLoader() { }
     96 
     97     protected:
     98         ThreadableLoader() { }
     99     };
    100 
    101 } // namespace WebCore
    102 
    103 #endif // ThreadableLoader_h
    104