Add android download controller.

content/browser/android/download_controller.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.

[jochen (gone - plz use gerrit), 2012/05/25 21:29:37]

2012

[nilesh, 2012/05/25 23:10:22]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/android/download_controller.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/renderer_host/render_view_host_delegate.h"
+#include "content/browser/renderer_host/resource_dispatcher_host_impl.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/download_item.h"
+#include "content/public/browser/global_request_id.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"
+#include "jni/download_controller_jni.h"
+#include "net/cookies/cookie_options.h"
+#include "net/cookies/cookie_store.h"
+#include "net/http/http_request_headers.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
+
+using base::android::AttachCurrentThread;
+using base::android::CheckException;
+using base::android::ConvertUTF8ToJavaString;
+using base::android::GetClass;
+using base::android::ScopedJavaLocalRef;
+using content::BrowserThread;
+using content::DownloadItem;
+using content::RenderViewHost;
+using content::WebContents;
+
+// JNI methods
+static void Init(JNIEnv* env, jobject obj) {

[jochen (gone - plz use gerrit), 2012/05/25 21:29:37]

where is this invoked from? Can it be in the anonymous namespace below?

[nilesh, 2012/05/25 23:10:22]

Its called via JNI from DownloadController.java (constructor calls
nativeInit()). It is declared (and mapped to nativeInit) in the generated
jni/download_controller_jni.h included above.

+  DownloadController::GetInstance()->Init(env, obj);
+}
+
+namespace {
+
+static const char* kDownloadControllerClassPathName =

[jochen (gone - plz use gerrit), 2012/05/25 21:29:37]

no static required

[nilesh, 2012/05/25 23:10:22]

Done.

+    "org/chromium/content/browser/DownloadController";
+
+}  // namespace
+
+bool RegisterDownloadController(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+// DownloadController implementation
+
+struct DownloadController::JavaObject {
+  jweak obj;

[jochen (gone - plz use gerrit), 2012/05/25 21:29:37]

variables after methods

[nilesh, 2012/05/25 23:10:22]

Done.

+  ScopedJavaLocalRef<jobject> Controller(JNIEnv* env) {
+    return GetRealObject(env, obj);
+  }
+};
+
+// static
+DownloadController* DownloadController::GetInstance() {
+  return Singleton<DownloadController>::get();
+}
+
+DownloadController::DownloadController()
+    : java_object_(NULL) {
+}
+
+DownloadController::~DownloadController() {
+  if (java_object_) {
+    JNIEnv* env = AttachCurrentThread();
+    env->DeleteWeakGlobalRef(java_object_->obj);
+    delete java_object_;
+    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::NewGetDownload(
+    content::RenderViewHost* render_view_host,
+    int request_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  int render_process_id = render_view_host->GetProcess()->GetID();
+  content::GlobalRequestID global_id(
+      render_process_id, request_id);

[jochen (gone - plz use gerrit), 2012/05/25 21:29:37]

should fit on previous line?

[nilesh, 2012/05/25 23:10:22]

Done.

+
+  // 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::IO, FROM_HERE,
+      base::Bind(&DownloadController::PrepareDownloadInfo,
+                 base::Unretained(this), global_id,
+                 render_process_id,
+                 render_view_host->GetRoutingID()));
+}
+
+void DownloadController::PrepareDownloadInfo(
+    const content::GlobalRequestID& global_id,
+    int render_process_id, int render_view_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  net::URLRequest* request =
+      content::ResourceDispatcherHostImpl::Get()->GetURLRequest(global_id);
+  DCHECK(request) << "Request to download not found.";
+
+  DownloadInfoAndroid info_android(request);
+  net::CookieOptions options;
+  options.set_include_httponly();
+
+  request->context()->cookie_store()->GetCookiesWithOptionsAsync(

[jochen (gone - plz use gerrit), 2012/05/25 21:29:37]

please ask the request context' network delegate whether you can get cookies

[nilesh, 2012/05/25 23:10:22]

NetworkDelegate::CanGetCookies needs a CookieList. I am not sure I have one
here. Can you explain a bit more? Thanks.

+      info_android.url, options,
+      base::Bind(&DownloadController::OnCookieResponse,
+                 base::Unretained(this), info_android, render_process_id,
+                 render_view_id));
+}
+
+void DownloadController::OnCookieResponse(DownloadInfoAndroid download_info,
+                                          int render_process_id,
+                                          int render_view_id,
+                                          const std::string& cookie) {
+  download_info.cookie = cookie;
+
+  // We have everything we need, start Android download on the UI thread.
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+      base::Bind(&DownloadController::StartAndroidDownload,
+                 base::Unretained(this), download_info, render_process_id,
+                 render_view_id));
+}
+
+void DownloadController::StartAndroidDownload(
+    const DownloadInfoAndroid& info,
+    int render_process_id,
+    int render_view_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  JNIEnv* env = AttachCurrentThread();
+
+  // Call newHttpGetDownload
+  jobject view = GetContentView(render_process_id, render_view_id);
+  if (!view) {
+    // The view went away. Can't proceed.
+    LOG(ERROR) << "Download failed on URL:" << info.url.spec();
+    return;
+  }
+
+  ScopedJavaLocalRef<jstring> jurl =
+      ConvertUTF8ToJavaString(env, info.url.spec());
+  ScopedJavaLocalRef<jstring> juser_agent =
+      ConvertUTF8ToJavaString(env, info.user_agent);
+  ScopedJavaLocalRef<jstring> jcontent_disposition =
+      ConvertUTF8ToJavaString(env, info.content_disposition);
+  ScopedJavaLocalRef<jstring> jmime_type =
+      ConvertUTF8ToJavaString(env, info.original_mime_type);
+  ScopedJavaLocalRef<jstring> jcookie =
+      ConvertUTF8ToJavaString(env, info.cookie);
+
+  Java_DownloadController_newHttpGetDownload(env,

[jochen (gone - plz use gerrit), 2012/05/25 21:29:37]

env should go on the next line

[nilesh, 2012/05/25 23:10:22]

Done.

+      java_object()->Controller(env).obj(), view, jurl.obj(), juser_agent.obj(),
+      jcontent_disposition.obj(), jmime_type.obj(), jcookie.obj(),
+      info.total_bytes);
+}
+
+void DownloadController::OnPostDownloadStarted(
+    WebContents* web_contents,
+    DownloadItem* download_item) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  JNIEnv* env = AttachCurrentThread();
+
+  // Register for updates to the DownloadItem.
+  download_item->AddObserver(this);
+
+  jobject view = GetContentViewFromWebContents(web_contents);
+  if(!view) {
+    // The view went away. Can't proceed.
+    return;
+  }
+
+  Java_DownloadController_onHttpPostDownloadStarted(
+      env, java_object()->Controller(env).obj(), view);
+}
+
+void DownloadController::OnDownloadUpdated(DownloadItem* item) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  if (item->GetState() != DownloadItem::COMPLETE)
+    return;
+
+  // Call onHttpPostDownloadCompleted
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> jurl =
+      ConvertUTF8ToJavaString(env, item->GetURL().spec());
+  ScopedJavaLocalRef<jstring> jcontent_disposition =
+      ConvertUTF8ToJavaString(env, item->GetContentDisposition());
+  ScopedJavaLocalRef<jstring> jmime_type =
+      ConvertUTF8ToJavaString(env, item->GetMimeType());
+  ScopedJavaLocalRef<jstring> jpath =
+      ConvertUTF8ToJavaString(env, item->GetFullPath().value());
+
+  jobject view = GetContentViewFromWebContents(item->GetWebContents());
+  if(!view) {
+    // We can get NULL WebContents from the DownloadItem.
+    return;
+  }
+
+  Java_DownloadController_onHttpPostDownloadCompleted(env,
+      java_object()->Controller(env).obj(), view, jurl.obj(),
+      jcontent_disposition.obj(), jmime_type.obj(), jpath.obj(),
+      item->GetReceivedBytes(), true);
+}
+
+jobject DownloadController::GetContentView(int render_process_id,
+                                           int render_view_id) {
+  RenderViewHost* render_view_host =
+      RenderViewHost::FromID(render_process_id, render_view_id);
+
+  if (!render_view_host)
+    return NULL;
+
+  WebContents* web_contents =
+      render_view_host->GetDelegate()->GetAsWebContents();
+
+  if (!web_contents)
+    return NULL;
+
+  return GetContentViewFromWebContents(web_contents);
+}
+
+jobject DownloadController::GetContentViewFromWebContents(
+    WebContents* web_contents) {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+
+DownloadController::JavaObject* DownloadController::java_object() {
+  if (!java_object_) {
+    // Initialize Java DownloadController by calling
+    // DownloadController.getInstance(), which will call Init()
+    // if Java DownloadController is not instantiated already.
+    JNIEnv* env = AttachCurrentThread();
+    ScopedJavaLocalRef<jclass> clazz =
+        GetClass(env, kDownloadControllerClassPathName);
+    jmethodID get_instance = GetStaticMethodID(env, clazz, "getInstance",
+        "()Lorg/chromium/content/browser/DownloadController;");
+    ScopedJavaLocalRef<jobject> jobj(env,
+        env->CallStaticObjectMethod(clazz.obj(), get_instance));
+    CheckException(env);
+  }
+
+  DCHECK(java_object_);
+  return java_object_;
+}
+
+DownloadController::DownloadInfoAndroid::DownloadInfoAndroid(
+    net::URLRequest* request) {
+  request->GetResponseHeaderByName("content-disposition", &content_disposition);
+  request->GetResponseHeaderByName("mime-type", &original_mime_type);
+  request->extra_request_headers().GetHeader(
+      net::HttpRequestHeaders::kUserAgent,
+      &user_agent);
+  if (!request->url_chain().empty()) {
+    original_url = request->url_chain().front();
+    url = request->url_chain().back();
+  }
+}