cef/include/wrapper/cef_resource_manager.h

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// Copyright (c) 2015 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// ---------------------------------------------------------------------------
//
// The contents of this file are only available to applications that link
// against the libcef_dll_wrapper target.
//
#ifndef CEF_INCLUDE_WRAPPER_CEF_RESOURCE_MANAGER_H_
#define CEF_INCLUDE_WRAPPER_CEF_RESOURCE_MANAGER_H_
#pragma once
#include <list>
#include <memory>
#include "include/base/cef_callback.h"
#include "include/base/cef_ref_counted.h"
#include "include/base/cef_weak_ptr.h"
#include "include/cef_request_handler.h"
#include "include/wrapper/cef_closure_task.h"
#include "include/wrapper/cef_helpers.h"
///
/// Class for managing multiple resource providers. For each resource request
/// providers will be called in order and have the option to (a) handle the
/// request by returning a CefResourceHandler, (b) pass the request to the next
/// provider in order, or (c) stop handling the request. See comments on the
/// Request object for additional usage information. The methods of this class
/// may be called on any browser process thread unless otherwise indicated.
///
class CefResourceManager
: public base::RefCountedThreadSafe<CefResourceManager,
CefDeleteOnIOThread> {
public:
///
/// Provides an opportunity to modify |url| before it is passed to a provider.
/// For example, the implementation could rewrite |url| to include a default
/// file extension. |url| will be fully qualified and may contain query or
/// fragment components.
///
using UrlFilter =
base::RepeatingCallback<std::string(const std::string& /*url*/)>;
///
/// Used to resolve mime types for URLs, usually based on the file extension.
/// |url| will be fully qualified and may contain query or fragment
/// components.
///
using MimeTypeResolver =
base::RepeatingCallback<std::string(const std::string& /*url*/)>;
private:
// Values that stay with a request as it moves between providers.
struct RequestParams {
std::string url_;
CefRefPtr<CefBrowser> browser_;
CefRefPtr<CefFrame> frame_;
CefRefPtr<CefRequest> request_;
UrlFilter url_filter_;
MimeTypeResolver mime_type_resolver_;
};
// Values that are associated with the pending request only.
struct RequestState;
public:
///
/// Object representing a request. Each request object is used for a single
/// call to Provider::OnRequest and will become detached (meaning the
/// callbacks will no longer trigger) after Request::Continue or Request::Stop
/// is called. A request passed to Provider::OnRequestCanceled will already
/// have been detached. The methods of this class may be called on any browser
/// process thread.
///
class Request : public base::RefCountedThreadSafe<Request> {
public:
Request(const Request&) = delete;
Request& operator=(const Request&) = delete;
///
/// Returns the URL associated with this request. The returned value will be
/// fully qualified but will not contain query or fragment components. It
/// will already have been passed through the URL filter.
///
std::string url() const { return params_.url_; }
///
/// Returns the CefBrowser associated with this request.
///
CefRefPtr<CefBrowser> browser() const { return params_.browser_; }
///
/// Returns the CefFrame associated with this request.
///
CefRefPtr<CefFrame> frame() const { return params_.frame_; }
///
/// Returns the CefRequest associated with this request.
///
CefRefPtr<CefRequest> request() const { return params_.request_; }
///
/// Returns the current URL filter.
///
const CefResourceManager::UrlFilter& url_filter() const {
return params_.url_filter_;
}
///
/// Returns the current mime type resolver.
///
const CefResourceManager::MimeTypeResolver& mime_type_resolver() const {
return params_.mime_type_resolver_;
}
///
/// Continue handling the request. If |handler| is non-NULL then no
/// additional providers will be called and the |handler| value will be
/// returned via CefResourceManager::GetResourceHandler. If |handler| is
/// NULL then the next provider in order, if any, will be called. If there
/// are no additional providers then NULL will be returned via
/// CefResourceManager:: GetResourceHandler.
///
void Continue(CefRefPtr<CefResourceHandler> handler);
///
/// Stop handling the request. No additional providers will be called and
/// NULL will be returned via CefResourceManager::GetResourceHandler.
///
void Stop();
private:
// Only allow deletion via scoped_refptr.
friend class base::RefCountedThreadSafe<Request>;
friend class CefResourceManager;
// The below methods are called on the browser process IO thread.
explicit Request(std::unique_ptr<RequestState> state);
std::unique_ptr<RequestState> SendRequest();
bool HasState();
static void ContinueOnIOThread(std::unique_ptr<RequestState> state,
CefRefPtr<CefResourceHandler> handler);
static void StopOnIOThread(std::unique_ptr<RequestState> state);
// Will be non-NULL while the request is pending. Only accessed on the
// browser process IO thread.
std::unique_ptr<RequestState> state_;
// Params that stay with this request object. Safe to access on any thread.
RequestParams params_;
};
using RequestList = std::list<scoped_refptr<Request>>;
///
/// Interface implemented by resource providers. A provider may be created on
/// any thread but the methods will be called on, and the object will be
/// destroyed on, the browser process IO thread.
///
class Provider {
public:
///
/// Called to handle a request. If the provider knows immediately that it
/// will not handle the request return false. Otherwise, return true and
/// call Request::Continue or Request::Stop either in this method or
/// asynchronously to indicate completion. See comments on Request for
/// additional usage information.
///
virtual bool OnRequest(scoped_refptr<Request> request) = 0;
///
/// Called when a request has been canceled. It is still safe to dereference
/// |request| but any calls to Request::Continue or Request::Stop will be
/// ignored.
///
virtual void OnRequestCanceled(scoped_refptr<Request> request) {}
virtual ~Provider() {}
};
CefResourceManager();
CefResourceManager(const CefResourceManager&) = delete;
CefResourceManager& operator=(const CefResourceManager&) = delete;
///
/// Add a provider that maps requests for |url| to |content|. |url| should be
/// fully qualified but not include a query or fragment component. If
/// |mime_type| is empty the MimeTypeResolver will be used. See comments on
/// AddProvider for usage of the |order| and |identifier| parameters.
///
void AddContentProvider(const std::string& url,
const std::string& content,
const std::string& mime_type,
int order,
const std::string& identifier);
///
/// Add a provider that maps requests that start with |url_path| to files
/// under |directory_path|. |url_path| should include an origin and optional
/// path component only. Files will be loaded when a matching URL is
/// requested. See comments on AddProvider for usage of the |order| and
/// |identifier| parameters.
///
void AddDirectoryProvider(const std::string& url_path,
const std::string& directory_path,
int order,
const std::string& identifier);
///
/// Add a provider that maps requests that start with |url_path| to files
/// stored in the archive file at |archive_path|. |url_path| should include an
/// origin and optional path component only. The archive file will be loaded
/// when a matching URL is requested for the first time. See comments on
/// AddProvider for usage of the |order| and |identifier| parameters.
///
void AddArchiveProvider(const std::string& url_path,
const std::string& archive_path,
const std::string& password,
int order,
const std::string& identifier);
///
/// Add a provider. This object takes ownership of |provider|. Providers will
/// be called in ascending order based on the |order| value. Multiple
/// providers sharing the same |order| value will be called in the order that
/// they were added. The |identifier| value, which does not need to be unique,
/// can be used to remove the provider at a later time.
///
void AddProvider(Provider* provider,
int order,
const std::string& identifier);
///
/// Remove all providers with the specified |identifier| value. If any removed
/// providers have pending requests the Provider::OnRequestCancel method will
/// be called. The removed providers may be deleted immediately or at a later
/// time.
///
void RemoveProviders(const std::string& identifier);
///
/// Remove all providers. If any removed providers have pending requests the
/// Provider::OnRequestCancel method will be called. The removed providers may
/// be deleted immediately or at a later time.
///
void RemoveAllProviders();
///
/// Set the url filter. If not set the default no-op filter will be used.
/// Changes to this value will not affect currently pending requests.
///
void SetUrlFilter(const UrlFilter& filter);
///
/// Set the mime type resolver. If not set the default resolver will be used.
/// Changes to this value will not affect currently pending requests.
///
void SetMimeTypeResolver(const MimeTypeResolver& resolver);
/// The below methods should be called from other CEF handlers. They must be
/// called exactly as documented for the manager to function correctly.
///
/// Called from CefRequestHandler::OnBeforeResourceLoad on the browser process
/// IO thread.
///
cef_return_value_t OnBeforeResourceLoad(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefCallback> callback);
///
/// Called from CefRequestHandler::GetResourceHandler on the browser process
/// IO thread.
///
CefRefPtr<CefResourceHandler> GetResourceHandler(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request);
private:
// Only allow deletion via scoped_refptr.
friend struct CefDeleteOnThread<TID_IO>;
friend class base::RefCountedThreadSafe<CefResourceManager,
CefDeleteOnIOThread>;
~CefResourceManager();
// Provider and associated information.
struct ProviderEntry;
using ProviderEntryList = std::list<ProviderEntry*>;
// Values associated with the pending request only. Ownership will be passed
// between requests and the resource manager as request handling proceeds.
struct RequestState {
~RequestState();
base::WeakPtr<CefResourceManager> manager_;
// Callback to execute once request handling is complete.
CefRefPtr<CefCallback> callback_;
// Position of the currently associated ProviderEntry in the |providers_|
// list.
ProviderEntryList::iterator current_entry_pos_;
// Position of this request object in the currently associated
// ProviderEntry's |pending_requests_| list.
RequestList::iterator current_request_pos_;
// Params that will be copied to each request object.
RequestParams params_;
};
// Methods that manage request state between requests. Called on the browser
// process IO thread.
bool SendRequest(std::unique_ptr<RequestState> state);
void ContinueRequest(std::unique_ptr<RequestState> state,
CefRefPtr<CefResourceHandler> handler);
void StopRequest(std::unique_ptr<RequestState> state);
bool IncrementProvider(RequestState* state);
void DetachRequestFromProvider(RequestState* state);
void GetNextValidProvider(ProviderEntryList::iterator& iterator);
void DeleteProvider(ProviderEntryList::iterator& iterator, bool stop);
// The below members are only accessed on the browser process IO thread.
// List of providers including additional associated information.
ProviderEntryList providers_;
// Map of response ID to pending CefResourceHandler object.
using PendingHandlersMap = std::map<uint64_t, CefRefPtr<CefResourceHandler>>;
PendingHandlersMap pending_handlers_;
UrlFilter url_filter_;
MimeTypeResolver mime_type_resolver_;
// Must be the last member. Created and accessed on the IO thread.
std::unique_ptr<base::WeakPtrFactory<CefResourceManager>> weak_ptr_factory_;
};
#endif // CEF_INCLUDE_WRAPPER_CEF_RESOURCE_MANAGER_H_