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. Created and accessed on the IO thread.

scoped_ptr<base::WeakPtrFactory<CefResourceManager> > weak_ptr_factory_;

DISALLOW_COPY_AND_ASSIGN(CefResourceManager);