// Copyright (c) 2012 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.
//
// This file provides base classes used to issue HTTP requests for Google
// APIs.
#ifndef GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_
#define GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "google_apis/drive/gdata_errorcode.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_fetcher_response_writer.h"
#include "url/gurl.h"
namespace base {
class Value;
} // namespace base
namespace google_apis {
class RequestSender;
// Callback used to pass parsed JSON from ParseJson(). If parsing error occurs,
// then the passed argument is null.
typedef base::Callback<void(scoped_ptr<base::Value> value)> ParseJsonCallback;
// Callback used for DownloadFileRequest and ResumeUploadRequestBase.
typedef base::Callback<void(int64 progress, int64 total)> ProgressCallback;
// Callback used to get the content from DownloadFileRequest.
typedef base::Callback<void(
GDataErrorCode error,
scoped_ptr<std::string> content)> GetContentCallback;
// Parses JSON passed in |json| on |blocking_task_runner|. Runs |callback| on
// the calling thread when finished with either success or failure.
// The callback must not be null.
void ParseJson(base::TaskRunner* blocking_task_runner,
const std::string& json,
const ParseJsonCallback& callback);
//======================= AuthenticatedRequestInterface ======================
// An interface class for implementing a request which requires OAuth2
// authentication.
class AuthenticatedRequestInterface {
public:
// Called when re-authentication is required. See Start() for details.
typedef base::Callback<void(AuthenticatedRequestInterface* request)>
ReAuthenticateCallback;
virtual ~AuthenticatedRequestInterface() {}
// Starts the request with |access_token|. User-Agent header will be set
// to |custom_user_agent| if the value is not empty.
//
// |callback| is called when re-authentication is needed for a certain
// number of times (see kMaxReAuthenticateAttemptsPerRequest in .cc).
// The callback should retry by calling Start() again with a new access
// token, or just call OnAuthFailed() if a retry is not attempted.
// |callback| must not be null.
virtual void Start(const std::string& access_token,
const std::string& custom_user_agent,
const ReAuthenticateCallback& callback) = 0;
// Invoked when the authentication failed with an error code |code|.
virtual void OnAuthFailed(GDataErrorCode code) = 0;
// Gets a weak pointer to this request object. Since requests may be
// deleted when it is canceled by user action, for posting asynchronous tasks
// on the authentication request object, weak pointers have to be used.
// TODO(kinaba): crbug.com/134814 use more clean life time management than
// using weak pointers.
virtual base::WeakPtr<AuthenticatedRequestInterface> GetWeakPtr() = 0;
// Cancels the request. It will invoke the callback object passed in
// each request's constructor with error code GDATA_CANCELLED.
virtual void Cancel() = 0;
};
//=========================== ResponseWriter ==================================
// Saves the response for the request to a file or string.
class ResponseWriter : public net::URLFetcherResponseWriter {
public:
// If file_path is not empty, the response will be saved with file_writer_,
// otherwise it will be saved to data_.
ResponseWriter(base::SequencedTaskRunner* file_task_runner,
const base::FilePath& file_path,
const GetContentCallback& get_content_callback);
virtual ~ResponseWriter();
const std::string& data() const { return data_; }
// Disowns the output file.
void DisownFile();
// URLFetcherResponseWriter overrides:
virtual int Initialize(const net::CompletionCallback& callback) OVERRIDE;
virtual int Write(net::IOBuffer* buffer,
int num_bytes,
const net::CompletionCallback& callback) OVERRIDE;
virtual int Finish(const net::CompletionCallback& callback) OVERRIDE;
private:
void DidWrite(scoped_refptr<net::IOBuffer> buffer,
const net::CompletionCallback& callback,
int result);
const GetContentCallback get_content_callback_;
std::string data_;
scoped_ptr<net::URLFetcherFileWriter> file_writer_;
base::WeakPtrFactory<ResponseWriter> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ResponseWriter);
};
//============================ UrlFetchRequestBase ===========================
// Base class for requests that are fetching URLs.
class UrlFetchRequestBase : public AuthenticatedRequestInterface,
public net::URLFetcherDelegate {
public:
// AuthenticatedRequestInterface overrides.
virtual void Start(const std::string& access_token,
const std::string& custom_user_agent,
const ReAuthenticateCallback& callback) OVERRIDE;
virtual base::WeakPtr<AuthenticatedRequestInterface> GetWeakPtr() OVERRIDE;
virtual void Cancel() OVERRIDE;
protected:
explicit UrlFetchRequestBase(RequestSender* sender);
virtual ~UrlFetchRequestBase();
// Gets URL for the request.
virtual GURL GetURL() const = 0;
// Returns the request type. A derived class should override this method
// for a request type other than HTTP GET.
virtual net::URLFetcher::RequestType GetRequestType() const;
// Returns the extra HTTP headers for the request. A derived class should
// override this method to specify any extra headers needed for the request.
virtual std::vector<std::string> GetExtraRequestHeaders() const;
// Used by a derived class to add any content data to the request.
// Returns true if |upload_content_type| and |upload_content| are updated
// with the content type and data for the request.
// Note that this and GetContentFile() cannot be used together.
virtual bool GetContentData(std::string* upload_content_type,
std::string* upload_content);
// Used by a derived class to add content data which is the whole file or
// a part of the file at |local_file_path|.
// Returns true if all the arguments are updated for the content being
// uploaded.
// Note that this and GetContentData() cannot be used together.
virtual bool GetContentFile(base::FilePath* local_file_path,
int64* range_offset,
int64* range_length,
std::string* upload_content_type);
// Used by a derived class to set an output file path if they want to save
// the downloaded content to a file at a specific path.
// Sets |get_content_callback|, which is called when some part of the response
// is read.
virtual void GetOutputFilePath(base::FilePath* local_file_path,
GetContentCallback* get_content_callback);
// Invoked by OnURLFetchComplete when the request completes without an
// authentication error. Must be implemented by a derived class.
virtual void ProcessURLFetchResults(const net::URLFetcher* source) = 0;
// Invoked by this base class upon an authentication error or cancel by
// a user request. Must be implemented by a derived class.
virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) = 0;
// Invoked from derived classes when ProcessURLFetchResults() is completed.
void OnProcessURLFetchResultsComplete();
// Returns an appropriate GDataErrorCode based on the HTTP response code and
// the status of the URLFetcher.
GDataErrorCode GetErrorCode();
// Returns true if called on the thread where the constructor was called.
bool CalledOnValidThread();
// Returns the writer which is used to save the response for the request.
ResponseWriter* response_writer() const { return response_writer_; }
// Returns the task runner that should be used for blocking tasks.
base::SequencedTaskRunner* blocking_task_runner() const;
private:
// URLFetcherDelegate overrides.
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
// AuthenticatedRequestInterface overrides.
virtual void OnAuthFailed(GDataErrorCode code) OVERRIDE;
ReAuthenticateCallback re_authenticate_callback_;
int re_authenticate_count_;
scoped_ptr<net::URLFetcher> url_fetcher_;
ResponseWriter* response_writer_; // Owned by |url_fetcher_|.
RequestSender* sender_;
GDataErrorCode error_code_;
base::ThreadChecker thread_checker_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<UrlFetchRequestBase> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(UrlFetchRequestBase);
};
//============================ EntryActionRequest ============================
// Callback type for requests that return only error status, like: Delete/Move.
typedef base::Callback<void(GDataErrorCode error)> EntryActionCallback;
// This class performs a simple action over a given entry (document/file).
// It is meant to be used for requests that return no JSON blobs.
class EntryActionRequest : public UrlFetchRequestBase {
public:
// |callback| is called when the request is finished either by success or by
// failure. It must not be null.
EntryActionRequest(RequestSender* sender,
const EntryActionCallback& callback);
virtual ~EntryActionRequest();
protected:
// Overridden from UrlFetchRequestBase.
virtual void ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) OVERRIDE;
private:
const EntryActionCallback callback_;
DISALLOW_COPY_AND_ASSIGN(EntryActionRequest);
};
//============================== GetDataRequest ==============================
// Callback type for requests that returns JSON data.
typedef base::Callback<void(GDataErrorCode error,
scoped_ptr<base::Value> json_data)> GetDataCallback;
// This class performs the request for fetching and converting the fetched
// content into a base::Value.
class GetDataRequest : public UrlFetchRequestBase {
public:
// |callback| is called when the request finishes either by success or by
// failure. On success, a JSON Value object is passed. It must not be null.
GetDataRequest(RequestSender* sender, const GetDataCallback& callback);
virtual ~GetDataRequest();
protected:
// UrlFetchRequestBase overrides.
virtual void ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
virtual void RunCallbackOnPrematureFailure(
GDataErrorCode fetch_error_code) OVERRIDE;
private:
// Parses JSON response.
void ParseResponse(GDataErrorCode fetch_error_code, const std::string& data);
// Called when ParseJsonOnBlockingPool() is completed.
void OnDataParsed(GDataErrorCode fetch_error_code,
scoped_ptr<base::Value> value);
const GetDataCallback callback_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<GetDataRequest> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(GetDataRequest);
};
//=========================== InitiateUploadRequestBase=======================
// Callback type for DriveServiceInterface::InitiateUpload.
typedef base::Callback<void(GDataErrorCode error,
const GURL& upload_url)> InitiateUploadCallback;
// This class provides base implementation for performing the request for
// initiating the upload of a file.
// |callback| will be called with the obtained upload URL. The URL will be
// used with requests for resuming the file uploading.
//
// Here's the flow of uploading:
// 1) Get the upload URL with a class inheriting InitiateUploadRequestBase.
// 2) Upload the first 1GB (see kUploadChunkSize in drive_uploader.cc)
// of the target file to the upload URL
// 3) If there is more data to upload, go to 2).
//
class InitiateUploadRequestBase : public UrlFetchRequestBase {
protected:
// |callback| will be called with the upload URL, where upload data is
// uploaded to with ResumeUploadRequestBase. It must not be null.
// |content_type| and |content_length| should be the attributes of the
// uploading file.
InitiateUploadRequestBase(RequestSender* sender,
const InitiateUploadCallback& callback,
const std::string& content_type,
int64 content_length);
virtual ~InitiateUploadRequestBase();
// UrlFetchRequestBase overrides.
virtual void ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) OVERRIDE;
virtual std::vector<std::string> GetExtraRequestHeaders() const OVERRIDE;
private:
const InitiateUploadCallback callback_;
const std::string content_type_;
const int64 content_length_;
DISALLOW_COPY_AND_ASSIGN(InitiateUploadRequestBase);
};
//========================== UploadRangeRequestBase ==========================
// Struct for response to ResumeUpload and GetUploadStatus.
struct UploadRangeResponse {
UploadRangeResponse();
UploadRangeResponse(GDataErrorCode code,
int64 start_position_received,
int64 end_position_received);
~UploadRangeResponse();
GDataErrorCode code;
// The values of "Range" header returned from the server. The values are
// used to continue uploading more data. These are set to -1 if an upload
// is complete.
// |start_position_received| is inclusive and |end_position_received| is
// exclusive to follow the common C++ manner, although the response from
// the server has "Range" header in inclusive format at both sides.
int64 start_position_received;
int64 end_position_received;
};
// Base class for a URL fetch request expecting the response containing the
// current uploading range. This class processes the response containing
// "Range" header and invoke OnRangeRequestComplete.
class UploadRangeRequestBase : public UrlFetchRequestBase {
protected:
// |upload_url| is the URL of where to upload the file to.
UploadRangeRequestBase(RequestSender* sender, const GURL& upload_url);
virtual ~UploadRangeRequestBase();
// UrlFetchRequestBase overrides.
virtual GURL GetURL() const OVERRIDE;
virtual net::URLFetcher::RequestType GetRequestType() const OVERRIDE;
virtual void ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) OVERRIDE;
// This method will be called when the request is done, regardless of
// whether it is succeeded or failed.
//
// 1) If there is more data to upload, |code| of |response| is set to
// HTTP_RESUME_INCOMPLETE, and positions are set appropriately. Also, |value|
// will be set to NULL.
// 2) If the upload is complete, |code| is set to HTTP_CREATED for a new file
// or HTTP_SUCCESS for an existing file. Positions are set to -1, and |value|
// is set to a parsed JSON value representing the uploaded file.
// 3) If a premature failure is found, |code| is set to a value representing
// the situation. Positions are set to 0, and |value| is set to NULL.
//
// See also the comments for UploadRangeResponse.
// Note: Subclasses should have responsibility to run some callback
// in this method to notify the finish status to its clients (or ignore it
// under its responsibility).
virtual void OnRangeRequestComplete(
const UploadRangeResponse& response, scoped_ptr<base::Value> value) = 0;
private:
// Called when ParseJson() is completed.
void OnDataParsed(GDataErrorCode code, scoped_ptr<base::Value> value);
const GURL upload_url_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<UploadRangeRequestBase> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(UploadRangeRequestBase);
};
//========================== ResumeUploadRequestBase =========================
// This class performs the request for resuming the upload of a file.
// More specifically, this request uploads a chunk of data carried in |buf|
// of ResumeUploadResponseBase. This class is designed to share the
// implementation of upload resuming between GData WAPI and Drive API v2.
// The subclasses should implement OnRangeRequestComplete inherited by
// UploadRangeRequestBase, because the type of the response should be
// different (although the format in the server response is JSON).
class ResumeUploadRequestBase : public UploadRangeRequestBase {
protected:
// |start_position| is the start of range of contents currently stored in
// |buf|. |end_position| is the end of range of contents currently stared in
// |buf|. This is exclusive. For instance, if you are to upload the first
// 500 bytes of data, |start_position| is 0 and |end_position| is 500.
// |content_length| and |content_type| are the length and type of the
// file content to be uploaded respectively.
// |buf| holds current content to be uploaded.
// See also UploadRangeRequestBase's comment for remaining parameters
// meaning.
ResumeUploadRequestBase(RequestSender* sender,
const GURL& upload_location,
int64 start_position,
int64 end_position,
int64 content_length,
const std::string& content_type,
const base::FilePath& local_file_path);
virtual ~ResumeUploadRequestBase();
// UrlFetchRequestBase overrides.
virtual std::vector<std::string> GetExtraRequestHeaders() const OVERRIDE;
virtual bool GetContentFile(base::FilePath* local_file_path,
int64* range_offset,
int64* range_length,
std::string* upload_content_type) OVERRIDE;
private:
// The parameters for the request. See ResumeUploadParams for the details.
const int64 start_position_;
const int64 end_position_;
const int64 content_length_;
const std::string content_type_;
const base::FilePath local_file_path_;
DISALLOW_COPY_AND_ASSIGN(ResumeUploadRequestBase);
};
//======================== GetUploadStatusRequestBase ========================
// This class performs the request for getting the current upload status
// of a file.
// This request calls OnRangeRequestComplete() with:
// - HTTP_RESUME_INCOMPLETE and the range of previously uploaded data,
// if a file has been partially uploaded. |value| is not used.
// - HTTP_SUCCESS or HTTP_CREATED (up to the upload mode) and |value|
// for the uploaded data, if a file has been completely uploaded.
// See also UploadRangeRequestBase.
class GetUploadStatusRequestBase : public UploadRangeRequestBase {
public:
// |content_length| is the whole data size to be uploaded.
// See also UploadRangeRequestBase's constructor comment for other
// parameters.
GetUploadStatusRequestBase(RequestSender* sender,
const GURL& upload_url,
int64 content_length);
virtual ~GetUploadStatusRequestBase();
protected:
// UrlFetchRequestBase overrides.
virtual std::vector<std::string> GetExtraRequestHeaders() const OVERRIDE;
private:
const int64 content_length_;
DISALLOW_COPY_AND_ASSIGN(GetUploadStatusRequestBase);
};
//============================ DownloadFileRequest ===========================
// Callback type for receiving the completion of DownloadFileRequest.
typedef base::Callback<void(GDataErrorCode error,
const base::FilePath& temp_file)>
DownloadActionCallback;
// This is a base class for performing the request for downloading a file.
class DownloadFileRequestBase : public UrlFetchRequestBase {
public:
// download_action_callback:
// This callback is called when the download is complete. Must not be null.
//
// get_content_callback:
// This callback is called when some part of the content is
// read. Used to read the download content progressively. May be null.
//
// progress_callback:
// This callback is called for periodically reporting the number of bytes
// downloaded so far. May be null.
//
// download_url:
// Specifies the target file to download.
//
// output_file_path:
// Specifies the file path to save the downloaded file.
//
DownloadFileRequestBase(
RequestSender* sender,
const DownloadActionCallback& download_action_callback,
const GetContentCallback& get_content_callback,
const ProgressCallback& progress_callback,
const GURL& download_url,
const base::FilePath& output_file_path);
virtual ~DownloadFileRequestBase();
protected:
// UrlFetchRequestBase overrides.
virtual GURL GetURL() const OVERRIDE;
virtual void GetOutputFilePath(
base::FilePath* local_file_path,
GetContentCallback* get_content_callback) OVERRIDE;
virtual void ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) OVERRIDE;
// net::URLFetcherDelegate overrides.
virtual void OnURLFetchDownloadProgress(const net::URLFetcher* source,
int64 current, int64 total) OVERRIDE;
private:
const DownloadActionCallback download_action_callback_;
const GetContentCallback get_content_callback_;
const ProgressCallback progress_callback_;
const GURL download_url_;
const base::FilePath output_file_path_;
DISALLOW_COPY_AND_ASSIGN(DownloadFileRequestBase);
};
} // namespace google_apis
#endif // GOOGLE_APIS_DRIVE_BASE_REQUESTS_H_