content/public/browser/resource_context.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_
   6 #define CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/supports_user_data.h"
  14 #include "build/build_config.h"
  15 #include "content/common/content_export.h"
  16
  17 class GURL;
  18
  19 namespace appcache {
  20 class AppCacheService;
  21 }
  22
  23 namespace net {
  24 class ClientCertStore;
  25 class HostResolver;
  26 class KeygenHandler;
  27 class URLRequestContext;
  28 }
  29
  30 namespace content {
  31
  32 // ResourceContext contains the relevant context information required for
  33 // resource loading. It lives on the IO thread, although it is constructed on
  34 // the UI thread. It must be destructed on the IO thread.
  35 class CONTENT_EXPORT ResourceContext : public base::SupportsUserData {
  36  public:
  37 #if defined(OS_IOS)
  38   virtual ~ResourceContext() {}
  39 #else
  40   ResourceContext();
  41   virtual ~ResourceContext();
  42 #endif
  43   virtual net::HostResolver* GetHostResolver() = 0;
  44
  45   // DEPRECATED: This is no longer a valid given isolated apps/sites and
  46   // storage partitioning. This getter returns the default context associated
  47   // with a BrowsingContext.
  48   virtual net::URLRequestContext* GetRequestContext() = 0;
  49
  50   // Get platform ClientCertStore. May return NULL.
  51   virtual scoped_ptr<net::ClientCertStore> CreateClientCertStore();
  52
  53   // Create a platform KeygenHandler and pass it to |callback|. The |callback|
  54   // may be run synchronously.
  55   virtual void CreateKeygenHandler(
  56       uint32 key_size_in_bits,
  57       const std::string& challenge_string,
  58       const GURL& url,
  59       const base::Callback<void(scoped_ptr<net::KeygenHandler>)>& callback);
  60
  61   // Returns true if microphone access is allowed for |origin|. Used to
  62   // determine what level of authorization is given to |origin| to access
  63   // resource metadata.
  64   virtual bool AllowMicAccess(const GURL& origin) = 0;
  65
  66   // Returns true if web camera access is allowed for |origin|. Used to
  67   // determine what level of authorization is given to |origin| to access
  68   // resource metadata.
  69   virtual bool AllowCameraAccess(const GURL& origin) = 0;
  70
  71   // Returns a callback that can be invoked to get a random salt
  72   // string that is used for creating media device IDs.  The salt
  73   // should be stored in the current user profile and should be reset
  74   // if cookies are cleared. The default is an empty string.
  75   //
  76   // It is safe to hold on to the callback returned and use it without
  77   // regard to the lifetime of ResourceContext, although in general
  78   // you should not use it long after the profile has been destroyed.
  79   //
  80   // TODO(joi): We don't think it should be unnecessary to use this
  81   // after ResourceContext goes away. There is likely an underying bug
  82   // in the lifetime of ProfileIOData vs. ResourceProcessHost, where
  83   // sometimes ProfileIOData has gone away before RPH has finished
  84   // being torn down (on the IO thread). The current interface that
  85   // allows using the salt object after ResourceContext has gone away
  86   // was put in place to fix http://crbug.com/341211 but I intend to
  87   // try to figure out how the lifetime should be fixed properly. The
  88   // original interface was just a method that returns a string.
  89   //
  90   // TODO(perkj): Make this method pure virtual when crbug/315022 is
  91   // fixed.
  92   typedef base::Callback<std::string()> SaltCallback;
  93   virtual SaltCallback GetMediaDeviceIDSalt();
  94 };
  95
  96 }  // namespace content
  97
  98 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_