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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_WEBUI_CHROME_URL_DATA_MANAGER_BACKEND_H_
#define CHROME_BROWSER_WEBUI_CHROME_URL_DATA_MANAGER_BACKEND_H_
#pragma once
#include "base/basictypes.h"
#include "base/ref_counted.h"
#include "chrome/browser/webui/chrome_url_data_manager.h"
#include <map>
#include <string>
#include <vector>
class FilePath;
class GURL;
class URLRequestChromeJob;
namespace net {
class URLRequest;
class URLRequestJob;
}
// ChromeURLDataManagerBackend is used internally by ChromeURLDataManager on the
// IO thread. In most cases you can use the API in ChromeURLDataManager and
// ignore this class. ChromeURLDataManagerBackend is owned by
// ChromeURLRequestContext.
class ChromeURLDataManagerBackend {
public:
typedef int RequestID;
ChromeURLDataManagerBackend();
~ChromeURLDataManagerBackend();
// Invoked to register the protocol factories.
static void Register();
// Adds a DataSource to the collection of data sources.
void AddDataSource(ChromeURLDataManager::DataSource* source);
// Add/remove a path from the collection of file sources.
// A file source acts like a file:// URL to the specified path.
// Calling this from threads other the IO thread must be done via
// InvokeLater.
void AddFileSource(const std::string& source_name, const FilePath& path);
// DataSource invokes this. Sends the data to the URLRequest.
void DataAvailable(RequestID request_id, RefCountedMemory* bytes);
static net::URLRequestJob* Factory(net::URLRequest* request,
const std::string& scheme);
private:
friend class URLRequestChromeJob;
typedef std::map<std::string,
scoped_refptr<ChromeURLDataManager::DataSource> > DataSourceMap;
typedef std::map<std::string, FilePath> FileSourceMap;
typedef std::map<RequestID, URLRequestChromeJob*> PendingRequestMap;
// Parse a URL into the components used to resolve its request.
void URLToRequest(const GURL& url, std::string* source, std::string* path);
// Translate a chrome resource URL into a local file path if there is one.
// Returns false if there is no file handler for this URL
bool URLToFilePath(const GURL& url, FilePath* file_path);
// Called by the job when it's starting up.
// Returns false if |url| is not a URL managed by this object.
bool StartRequest(const GURL& url, URLRequestChromeJob* job);
// Remove a request from the list of pending requests.
void RemoveRequest(URLRequestChromeJob* job);
// Returns true if the job exists in |pending_requests_|. False otherwise.
// Called by ~URLRequestChromeJob to verify that |pending_requests_| is kept
// up to date.
bool HasPendingJob(URLRequestChromeJob* job) const;
// File sources of data, keyed by source name (e.g. "inspector").
FileSourceMap file_sources_;
// Custom sources of data, keyed by source path (e.g. "favicon").
DataSourceMap data_sources_;
// All pending URLRequestChromeJobs, keyed by ID of the request.
// URLRequestChromeJob calls into this object when it's constructed and
// destructed to ensure that the pointers in this map remain valid.
PendingRequestMap pending_requests_;
// The ID we'll use for the next request we receive.
RequestID next_request_id_;
DISALLOW_COPY_AND_ASSIGN(ChromeURLDataManagerBackend);
};
#endif // CHROME_BROWSER_WEBUI_CHROME_URL_DATA_MANAGER_BACKEND_H_
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