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// Copyright 2017 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.
#include <string>
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#import "ios/web/public/download/download_task.h"
#include "url/gurl.h"
@class NSURLSession;
namespace net {
class URLFetcherResponseWriter;
namespace web {
class DownloadTaskObserver;
class WebState;
// Implements DownloadTask interface. Uses background NSURLSession as
// implementation.
class DownloadTaskImpl : public DownloadTask {
class Delegate {
// Called when download task is about to be destroyed. Delegate should
// remove all references to the given DownloadTask and stop using it.
virtual void OnTaskDestroyed(DownloadTaskImpl* task) = 0;
// Creates background NSURLSession with given |identifier|, |cookies|,
// |delegate| and |delegate_queue|.
virtual NSURLSession* CreateSession(NSString* identifier,
NSArray<NSHTTPCookie*>* cookies,
id<NSURLSessionDataDelegate> delegate,
NSOperationQueue* delegate_queue) = 0;
virtual ~Delegate() = default;
// Constructs a new DownloadTaskImpl objects. |web_state|, |identifier| and
// |delegate| must be valid.
DownloadTaskImpl(const WebState* web_state,
const GURL& original_url,
const std::string& content_disposition,
int64_t total_bytes,
const std::string& mime_type,
ui::PageTransition page_transition,
NSString* identifier,
Delegate* delegate);
// Stops the download operation and clears the delegate.
void ShutDown();
// DownloadTask overrides:
DownloadTask::State GetState() const override;
void Start(std::unique_ptr<net::URLFetcherResponseWriter> writer) override;
void Cancel() override;
net::URLFetcherResponseWriter* GetResponseWriter() const override;
NSString* GetIndentifier() const override;
const GURL& GetOriginalUrl() const override;
bool IsDone() const override;
int GetErrorCode() const override;
int GetHttpCode() const override;
int64_t GetTotalBytes() const override;
int64_t GetReceivedBytes() const override;
int GetPercentComplete() const override;
std::string GetContentDisposition() const override;
std::string GetOriginalMimeType() const override;
std::string GetMimeType() const override;
ui::PageTransition GetTransitionType() const override;
base::string16 GetSuggestedFilename() const override;
bool HasPerformedBackgroundDownload() const override;
void AddObserver(DownloadTaskObserver* observer) override;
void RemoveObserver(DownloadTaskObserver* observer) override;
~DownloadTaskImpl() override;
// Creates background NSURLSession with given |identifier| and |cookies|.
NSURLSession* CreateSession(NSString* identifier,
NSArray<NSHTTPCookie*>* cookies);
// Asynchronously returns cookies for WebState associated with this task.
// Must be called on UI thread. The callback will be invoked on the UI thread.
void GetCookies(base::Callback<void(NSArray<NSHTTPCookie*>*)> callback);
// Starts the download with given cookies.
void StartWithCookies(NSArray<NSHTTPCookie*>* cookies);
// Starts parsing data:// url. Separate code path is used because
// NSURLSession does not support data URLs.
void StartDataUrlParsing();
// Called when download task was updated.
void OnDownloadUpdated();
// Called when download was completed and the data writing was finished.
void OnDownloadFinished(int error_code);
// Called when data:// url parsing has completed and the data has been
// written.
void OnDataUrlWritten(int bytes_written);
// A list of observers. Weak references.
base::ObserverList<DownloadTaskObserver, true>::Unchecked observers_;
// Back up corresponding public methods of DownloadTask interface.
State state_ = State::kNotStarted;
std::unique_ptr<net::URLFetcherResponseWriter> writer_;
GURL original_url_;
int error_code_ = 0;
int http_code_ = -1;
int64_t total_bytes_ = -1;
int64_t received_bytes_ = 0;
int percent_complete_ = -1;
std::string content_disposition_;
std::string original_mime_type_;
std::string mime_type_;
ui::PageTransition page_transition_ = ui::PAGE_TRANSITION_LINK;
NSString* identifier_ = nil;
bool has_performed_background_download_ = false;
const WebState* web_state_ = nullptr;
Delegate* delegate_ = nullptr;
NSURLSession* session_ = nil;
NSURLSessionTask* session_task_ = nil;
// Observes UIApplicationWillResignActiveNotification notifications.
id<NSObject> observer_ = nil;
base::WeakPtrFactory<DownloadTaskImpl> weak_factory_;
} // namespace web