Move DownloadControllerAndroid from content/ to chrome/

chrome/browser/android/download/download_controller.cc

Index: chrome/browser/android/download/download_controller.cc
diff --git a/chrome/browser/android/download/download_controller.cc b/chrome/browser/android/download/download_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..93981c3a77acceecae8707e243b49cc083b2a60d
--- /dev/null
+++ b/chrome/browser/android/download/download_controller.cc
@@ -0,0 +1,420 @@
+// Copyright 2016 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 "chrome/browser/android/download/download_controller.h"
+
+#include <memory>
+#include <utility>
+
+#include "base/android/context_utils.h"
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
+#include "base/synchronization/lock.h"
+#include "base/time/time.h"
+#include "chrome/browser/android/download/chrome_download_delegate.h"
+#include "chrome/browser/ui/android/view_android_helper.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/download_manager.h"
+#include "content/public/browser/download_url_parameters.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/common/referrer.h"
+#include "jni/DownloadController_jni.h"
+#include "net/base/filename_util.h"
+#include "ui/android/view_android.h"
+#include "ui/android/window_android.h"
+
+using base::android::ConvertUTF8ToJavaString;
+using base::android::ScopedJavaLocalRef;
+using content::BrowserContext;
+using content::BrowserThread;
+using content::ContextMenuParams;
+using content::DownloadItem;
+using content::DownloadManager;
+using content::WebContents;
+
+namespace {
+// Guards download_controller_
+base::LazyInstance<base::Lock> g_download_controller_lock_;
+
+WebContents* GetWebContents(int render_process_id, int render_view_id) {
+  content::RenderViewHost* render_view_host =
+      content::RenderViewHost::FromID(render_process_id, render_view_id);
+
+  if (!render_view_host)
+    return nullptr;
+
+  return WebContents::FromRenderViewHost(render_view_host);
+}
+
+void CreateContextMenuDownload(int render_process_id,
+                               int render_view_id,
+                               const content::ContextMenuParams& params,
+                               bool is_link,
+                               const std::string& extra_headers,
+                               bool granted) {
+  if (!granted)
+    return;
+
+  content::WebContents* web_contents =
+      GetWebContents(render_process_id, render_view_id);
+  if (!web_contents)
+    return;
+
+  const GURL& url = is_link ? params.link_url : params.src_url;
+  const GURL& referring_url =
+      params.frame_url.is_empty() ? params.page_url : params.frame_url;
+  content::DownloadManager* dlm =
+      content::BrowserContext::GetDownloadManager(
+          web_contents->GetBrowserContext());
+  std::unique_ptr<content::DownloadUrlParameters> dl_params(
+      content::DownloadUrlParameters::CreateForWebContentsMainFrame(
+          web_contents, url));
+  content::Referrer referrer = content::Referrer::SanitizeForRequest(
+      url,
+      content::Referrer(referring_url.GetAsReferrer(), params.referrer_policy));
+  dl_params->set_referrer(referrer);
+  if (is_link)
+    dl_params->set_referrer_encoding(params.frame_charset);
+  net::HttpRequestHeaders headers;
+  headers.AddHeadersFromString(extra_headers);
+  for (net::HttpRequestHeaders::Iterator it(headers); it.GetNext();)
+    dl_params->add_request_header(it.name(), it.value());
+  if (!is_link && extra_headers.empty())
+    dl_params->set_prefer_cache(true);
+  dl_params->set_prompt(false);
+  dlm->DownloadUrl(std::move(dl_params));
+}
+
+// Check if an interrupted download item can be auto resumed.
+bool IsInterruptedDownloadAutoResumable(content::DownloadItem* download_item) {
+  int interrupt_reason = download_item->GetLastReason();
+  DCHECK_NE(interrupt_reason, content::DOWNLOAD_INTERRUPT_REASON_NONE);
+  return
+      interrupt_reason == content::DOWNLOAD_INTERRUPT_REASON_NETWORK_TIMEOUT ||
+      interrupt_reason == content::DOWNLOAD_INTERRUPT_REASON_NETWORK_FAILED ||
+      interrupt_reason ==
+          content::DOWNLOAD_INTERRUPT_REASON_NETWORK_DISCONNECTED;
+}
+
+}  // namespace
+
+// JNI methods
+static void Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
+  DownloadController::GetInstance()->Init(env, obj);
+}
+
+static void OnRequestFileAccessResult(JNIEnv* env,
+                                      const JavaParamRef<jobject>& obj,
+                                      jlong callback_id,
+                                      jboolean granted) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK(callback_id);
+
+  // Convert java long long int to c++ pointer, take ownership.
+  std::unique_ptr<
+      DownloadControllerBase::AcquireFileAccessPermissionCallback>
+  cb(reinterpret_cast<
+      DownloadControllerBase::AcquireFileAccessPermissionCallback*>(
+      callback_id));
+  if (!granted) {
+    DownloadController::RecordDownloadCancelReason(
+        DownloadController::CANCEL_REASON_NO_STORAGE_PERMISSION);
+  }
+  cb->Run(granted);
+}
+
+struct DownloadController::JavaObject {
+  ScopedJavaLocalRef<jobject> Controller(JNIEnv* env) {
+    return GetRealObject(env, obj_);
+  }
+  jweak obj_;
+};
+
+// static
+bool DownloadController::RegisterDownloadController(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+// static
+DownloadControllerBase* DownloadControllerBase::Get() {
+  base::AutoLock lock(g_download_controller_lock_.Get());
+  if (!DownloadControllerBase::download_controller_)
+    download_controller_ = DownloadController::GetInstance();
+  return DownloadControllerBase::download_controller_;
+}
+
+// static
+void DownloadControllerBase::SetDownloadControllerBase(
+    DownloadControllerBase* download_controller) {
+  base::AutoLock lock(g_download_controller_lock_.Get());
+  DownloadControllerBase::download_controller_ = download_controller;
+}
+
+// static
+void DownloadController::RecordDownloadCancelReason(
+    DownloadCancelReason reason) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "MobileDownload.CancelReason", reason, CANCEL_REASON_MAX);
+}
+
+// static
+DownloadController* DownloadController::GetInstance() {
+  return base::Singleton<DownloadController>::get();
+}
+
+DownloadController::DownloadController()
+    : java_object_(NULL) {
+}
+
+DownloadController::~DownloadController() {
+  if (java_object_) {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    env->DeleteWeakGlobalRef(java_object_->obj_);
+    delete java_object_;
+    base::android::CheckException(env);
+  }
+}
+
+// Initialize references to Java object.
+void DownloadController::Init(JNIEnv* env, jobject obj) {
+  java_object_ = new JavaObject;
+  java_object_->obj_ = env->NewWeakGlobalRef(obj);
+}
+
+void DownloadController::AcquireFileAccessPermission(
+    WebContents* web_contents,
+    const DownloadControllerBase::AcquireFileAccessPermissionCallback& cb) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK(web_contents);
+
+  ui::WindowAndroid* window_android =
+      ViewAndroidHelper::FromWebContents(web_contents)->
+          GetViewAndroid()->GetWindowAndroid();
+  if (window_android && HasFileAccessPermission(window_android)) {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE, base::Bind(cb, true));
+    return;
+  }
+  // Make copy on the heap so we can pass the pointer through JNI.
+  intptr_t callback_id = reinterpret_cast<intptr_t>(
+      new DownloadControllerBase::AcquireFileAccessPermissionCallback(cb));
+  ChromeDownloadDelegate::FromWebContents(web_contents)->
+      RequestFileAccess(callback_id);
+}
+
+void DownloadController::SetDefaultDownloadFileName(
+    const std::string& file_name) {
+  default_file_name_ = file_name;
+}
+
+bool DownloadController::HasFileAccessPermission(
+    ui::WindowAndroid* window_android) {
+  ScopedJavaLocalRef<jobject> jwindow_android = window_android->GetJavaObject();
+
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK(!jwindow_android.is_null());
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  return Java_DownloadController_hasFileAccess(
+      env, GetJavaObject()->Controller(env).obj(), jwindow_android.obj());
+}
+
+void DownloadController::CreateGETDownload(
+    int render_process_id, int render_view_id, bool must_download,
+    const DownloadInfo& info) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  // We are yielding the UI thread and render_view_host may go away by
+  // the time we come back. Pass along render_process_id and render_view_id
+  // to retrieve it later (if it still exists).
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&DownloadController::StartAndroidDownload,
+                 base::Unretained(this),
+                 render_process_id, render_view_id, must_download, info));
+}
+
+void DownloadController::StartAndroidDownload(
+    int render_process_id, int render_view_id, bool must_download,
+    const DownloadInfo& info) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  WebContents* web_contents = GetWebContents(render_process_id, render_view_id);
+  if (!web_contents) {
+    // The view went away. Can't proceed.
+    LOG(ERROR) << "Download failed on URL:" << info.url.spec();
+    return;
+  }
+
+  AcquireFileAccessPermission(
+      web_contents,
+      base::Bind(&DownloadController::StartAndroidDownloadInternal,
+                 base::Unretained(this), render_process_id, render_view_id,
+                 must_download, info));
+}
+
+void DownloadController::StartAndroidDownloadInternal(
+    int render_process_id, int render_view_id, bool must_download,
+    const DownloadInfo& info, bool allowed) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (!allowed)
+    return;
+
+  WebContents* web_contents = GetWebContents(render_process_id, render_view_id);
+  // The view went away. Can't proceed.
+  if (!web_contents)
+    return;
+
+  base::string16 filename = net::GetSuggestedFilename(
+      info.url, info.content_disposition,
+      std::string(),  // referrer_charset
+      std::string(),  // suggested_name
+      info.original_mime_type,
+      default_file_name_);
+  ChromeDownloadDelegate::FromWebContents(web_contents)->RequestHTTPGetDownload(
+      info.url.spec(), info.user_agent,
+      info.content_disposition, info.original_mime_type,
+      info.cookie, info.referer, filename,
+      info.total_bytes, info.has_user_gesture,
+      must_download);
+}
+
+void DownloadController::OnDownloadStarted(
+    DownloadItem* download_item) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  WebContents* web_contents = download_item->GetWebContents();
+  if (!web_contents)
+    return;
+
+  // Register for updates to the DownloadItem.
+  download_item->AddObserver(this);
+
+  ChromeDownloadDelegate::FromWebContents(web_contents)->OnDownloadStarted(
+      download_item->GetTargetFilePath().BaseName().value(),
+      download_item->GetMimeType());
+}
+
+void DownloadController::OnDownloadUpdated(DownloadItem* item) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (item->IsDangerous() && (item->GetState() != DownloadItem::CANCELLED))
+    OnDangerousDownload(item);
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> jguid =
+      ConvertUTF8ToJavaString(env, item->GetGuid());
+  ScopedJavaLocalRef<jstring> jurl =
+      ConvertUTF8ToJavaString(env, item->GetURL().spec());
+  ScopedJavaLocalRef<jstring> jmime_type =
+      ConvertUTF8ToJavaString(env, item->GetMimeType());
+  ScopedJavaLocalRef<jstring> jpath =
+      ConvertUTF8ToJavaString(env, item->GetTargetFilePath().value());
+  ScopedJavaLocalRef<jstring> jfilename = ConvertUTF8ToJavaString(
+      env, item->GetTargetFilePath().BaseName().value());
+  ScopedJavaLocalRef<jstring> joriginal_url =
+      ConvertUTF8ToJavaString(env, item->GetOriginalUrl().spec());
+  ScopedJavaLocalRef<jstring> jreferrer_url =
+      ConvertUTF8ToJavaString(env, item->GetReferrerUrl().spec());
+
+  switch (item->GetState()) {
+    case DownloadItem::IN_PROGRESS: {
+      base::TimeDelta time_delta;
+      item->TimeRemaining(&time_delta);
+      Java_DownloadController_onDownloadUpdated(
+          env, GetJavaObject()->Controller(env).obj(), jurl.obj(),
+          jmime_type.obj(), jfilename.obj(), jpath.obj(),
+          item->GetReceivedBytes(), jguid.obj(),
+          item->PercentComplete(), time_delta.InMilliseconds(),
+          item->HasUserGesture(), item->IsPaused(),
+          item->GetBrowserContext()->IsOffTheRecord());
+      break;
+    }
+    case DownloadItem::COMPLETE:
+      // Multiple OnDownloadUpdated() notifications may be issued while the
+      // download is in the COMPLETE state. Only handle one.
+      item->RemoveObserver(this);
+
+      // Call onDownloadCompleted
+      Java_DownloadController_onDownloadCompleted(
+          env, GetJavaObject()->Controller(env).obj(), jurl.obj(),
+          jmime_type.obj(), jfilename.obj(), jpath.obj(),
+          item->GetReceivedBytes(), jguid.obj(),
+          joriginal_url.obj(), jreferrer_url.obj(), item->HasUserGesture());
+      DownloadController::RecordDownloadCancelReason(
+             DownloadController::CANCEL_REASON_NOT_CANCELED);
+      break;
+    case DownloadItem::CANCELLED:
+      Java_DownloadController_onDownloadCancelled(
+          env, GetJavaObject()->Controller(env).obj(), jguid.obj());
+      break;
+    case DownloadItem::INTERRUPTED:
+      // When device loses/changes network, we get a NETWORK_TIMEOUT,
+      // NETWORK_FAILED or NETWORK_DISCONNECTED error. Download should auto
+      // resume in this case.
+      Java_DownloadController_onDownloadInterrupted(
+          env, GetJavaObject()->Controller(env).obj(), jurl.obj(),
+          jmime_type.obj(), jfilename.obj(), jpath.obj(),
+          item->GetReceivedBytes(), jguid.obj(),
+          item->CanResume(), IsInterruptedDownloadAutoResumable(item),
+          item->GetBrowserContext()->IsOffTheRecord());
+      item->RemoveObserver(this);
+      break;
+    case DownloadItem::MAX_DOWNLOAD_STATE:
+      NOTREACHED();
+  }
+}
+
+void DownloadController::OnDangerousDownload(DownloadItem* item) {
+  WebContents* web_contents = item->GetWebContents();
+  if (!web_contents)
+    return;
+  ChromeDownloadDelegate::FromWebContents(web_contents)->OnDangerousDownload(
+      item->GetTargetFilePath().BaseName().value(), item->GetGuid());
+}
+
+DownloadController::JavaObject*
+    DownloadController::GetJavaObject() {
+  if (!java_object_) {
+    // Initialize Java DownloadController by calling
+    // DownloadController.getInstance(), which will call Init()
+    // if Java DownloadController is not instantiated already.
+    JNIEnv* env = base::android::AttachCurrentThread();
+    Java_DownloadController_getInstance(env);
+  }
+
+  DCHECK(java_object_);
+  return java_object_;
+}
+
+void DownloadController::StartContextMenuDownload(
+    const ContextMenuParams& params, WebContents* web_contents, bool is_link,
+    const std::string& extra_headers) {
+  int process_id = web_contents->GetRenderProcessHost()->GetID();
+  int routing_id = web_contents->GetRoutingID();
+  AcquireFileAccessPermission(
+      web_contents, base::Bind(&CreateContextMenuDownload, process_id,
+                               routing_id, params, is_link, extra_headers));
+}
+
+void DownloadController::DangerousDownloadValidated(
+    WebContents* web_contents,
+    const std::string& download_guid,
+    bool accept) {
+  if (!web_contents)
+    return;
+  DownloadManager* dlm =
+      BrowserContext::GetDownloadManager(web_contents->GetBrowserContext());
+  DownloadItem* item = dlm->GetDownloadByGuid(download_guid);
+  if (!item)
+    return;
+  if (accept)
+    item->ValidateDangerousDownload();
+  else
+    item->Remove();
+}