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Add CefResourceManager class for mapping requests to data providers (issue #1640).

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Marshall Greenblatt
2015-05-22 21:57:31 -04:00
parent d02f03a71a
commit b6e5310bce
13 changed files with 3037 additions and 78 deletions
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include/wrapper/cef_resource_manager.h Normal file
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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 "include/base/cef_macros.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.
///
typedef base::Callback<std::string(
const std::string& /*url*/)> UrlFilter;
///
// 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.
///
typedef base::Callback<std::string(
const std::string& /*url*/)> MimeTypeResolver;
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:
///
// 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(scoped_ptr<RequestState> state);
scoped_ptr<RequestState> SendRequest();
bool HasState();
static void ContinueOnIOThread(scoped_ptr<RequestState> state,
CefRefPtr<CefResourceHandler> handler);
static void StopOnIOThread(scoped_ptr<RequestState> state);
// Will be non-NULL while the request is pending. Only accessed on the
// browser process IO thread.
scoped_ptr<RequestState> state_;
// Params that stay with this request object. Safe to access on any thread.
RequestParams params_;
DISALLOW_COPY_AND_ASSIGN(Request);
};
typedef std::list<scoped_refptr<Request> > RequestList;
///
// 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();
///
// 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<CefRequestCallback> 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;
typedef std::list<ProviderEntry*> ProviderEntryList;
// 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<CefRequestCallback> 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(scoped_ptr<RequestState> state);
void ContinueRequest(scoped_ptr<RequestState> state,
CefRefPtr<CefResourceHandler> handler);
void StopRequest(scoped_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.
typedef std::map<uint64, CefRefPtr<CefResourceHandler> > PendingHandlersMap;
PendingHandlersMap pending_handlers_;
UrlFilter url_filter_;
MimeTypeResolver mime_type_resolver_;
// Must be the last member.
base::WeakPtrFactory<CefResourceManager> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(CefResourceManager);
};
#endif // CEF_INCLUDE_WRAPPER_CEF_RESOURCE_MANAGER_H_