[Android] Prompt with infobar on filename conflict

chrome/browser/android/download/chrome_download_delegate.cc

 // Copyright 2015 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_overwrite_infobar_delegate_java_initiated.h>

[Peter Kasting, 2015/02/25 06:24:57]

Both the location of this include and its use of angle brackets are something
outside my experience.

[Changwan Ryu, 2015/03/02 14:46:36]

Must be the result of eclipse auto refactoring.
Done.

 #include "chrome/browser/android/download/chrome_download_delegate.h"
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
+#include "base/bind.h"
+#include "base/callback.h"
 #include "base/files/file_path.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/android/download/download_overwrite_info.h"
 #include "chrome/browser/android/tab_android.h"
 #include "chrome/browser/download/download_extensions.h"
+#include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/android/download_controller_android.h"
 #include "jni/ChromeDownloadDelegate_jni.h"
 #include "ui/base/l10n/l10n_util.h"
 
-bool RegisterChromeDownloadDeleagte(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 // Gets the download warning text for the given file name.
 static jstring GetDownloadWarningText(
     JNIEnv* env, jclass clazz, jstring filename) {
   return base::android::ConvertUTF8ToJavaString(
       env, l10n_util::GetStringFUTF8(
           IDS_PROMPT_DANGEROUS_DOWNLOAD,
           base::android::ConvertJavaStringToUTF16(env, filename))).Release();
 }
 
 // Returns true if a file name is dangerous, or false otherwise.
 static jboolean IsDownloadDangerous(
     JNIEnv* env, jclass clazz, jstring filename) {
   base::FilePath path(base::android::ConvertJavaStringToUTF8(env, filename));
   return download_util::GetFileDangerLevel(path) !=
       download_util::NOT_DANGEROUS;
 }
 
 // Called when a dangerous download is validated.
 static void DangerousDownloadValidated(
     JNIEnv* env, jclass clazz, jobject tab, jint download_id, jboolean accept) {
   TabAndroid* tab_android = TabAndroid::GetNativeTab(env, tab);
   content::DownloadControllerAndroid::Get()->DangerousDownloadValidated(
       tab_android->web_contents(), download_id, accept);
 }
+
+// A class for keeping track of Java ChromeDownloadDelegate object and handling
+// PromptUserDone callback.
+class PromptUserDoneCB {
+ public:
+  PromptUserDoneCB(JNIEnv* env, jobject obj) : weak_java_obj_(env, obj) {}
+
+  ~PromptUserDoneCB() {}
+
+  void PromptUserDone(
+      const chrome::android::DownloadOverwriteInfo& download_overwrite_info) {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    ScopedJavaLocalRef<jobject> jobj = weak_java_obj_.get(env);
+    if (!jobj.obj())
+      return;
+
+    if (download_overwrite_info.dismissed)
+      return;
+
+    ScopedJavaLocalRef<jstring> jfile_name =
+        base::android::ConvertUTF8ToJavaString(
+            env, download_overwrite_info.file_name);
+    ScopedJavaLocalRef<jstring> jurl = base::android::ConvertUTF8ToJavaString(
+        env, download_overwrite_info.url);
+    ScopedJavaLocalRef<jstring> juser_agent =
+        base::android::ConvertUTF8ToJavaString(
+            env, download_overwrite_info.user_agent);
+    ScopedJavaLocalRef<jstring> jcontent_disposition =
+        base::android::ConvertUTF8ToJavaString(
+            env, download_overwrite_info.content_disposition);
+    ScopedJavaLocalRef<jstring> jmime_type =
+        base::android::ConvertUTF8ToJavaString(
+            env, download_overwrite_info.mime_type);
+    ScopedJavaLocalRef<jstring> jcookie =
+        base::android::ConvertUTF8ToJavaString(env,
+                                               download_overwrite_info.cookie);
+    ScopedJavaLocalRef<jstring> jreferer =
+        base::android::ConvertUTF8ToJavaString(env,
+                                               download_overwrite_info.referer);
+    Java_ChromeDownloadDelegate_enqueueDownloadManagerRequestFromNative(

[Ted C, 2015/02/26 00:57:55]

and any reason the delegate of the new class can't do this internally instead of
having to pass a callback?

Just wondering why it can't be a standalone delegate.

[Changwan Ryu, 2015/03/02 14:46:36]

Hmm... I thought I needed it to keep reference to the Java object.
After giving it more thought I removed this callback and passed
JavaObjectWeakGlobalRef (for ChromeDownloadDelegate) and ScopedJavaGlobalRef
(for DownloadInfo).

+        env, jobj.obj(), download_overwrite_info.overwrite, jfile_name.obj(),
+        jurl.obj(), juser_agent.obj(), jcontent_disposition.obj(),
+        jmime_type.obj(), jcookie.obj(), jreferer.obj(),
+        download_overwrite_info.has_user_gesture,
+        download_overwrite_info.content_length,
+        download_overwrite_info.is_GET_request);
+  }
+
+ private:
+  JavaObjectWeakGlobalRef weak_java_obj_;
+  DISALLOW_COPY_AND_ASSIGN(PromptUserDoneCB);
+};
+
+// Called when we need to interrupt download and ask users whether to overwrite
+// an existing file.
+static void LaunchDownloadOverwriteInfoBar(JNIEnv* env,
+                                           jclass clazz,
+                                           jobject obj,
+                                           jobject tab,
+                                           jstring file_name,
+                                           jstring dir_name,
+                                           jstring dir_full_path,
+                                           jstring url,
+                                           jstring user_agent,
+                                           jstring content_disposition,
+                                           jstring mime_type,
+                                           jstring cookie,
+                                           jstring referer,
+                                           jboolean has_user_gesture,
+                                           jlong content_length,
+                                           jboolean is_GET_request) {
+  chrome::android::DownloadOverwriteInfo download_overwrite_info(

[Ted C, 2015/02/26 00:57:55]

Any reason we don't just pass down the DownloadInfo java object and just use
that if need be?

[Changwan Ryu, 2015/03/02 14:46:36]

Done. We can pass downloadinfo by wrapping it inside ScopedJavaGlobalRef.

+      base::android::ConvertJavaStringToUTF8(env, file_name),
+      base::android::ConvertJavaStringToUTF8(env, dir_name),
+      base::android::ConvertJavaStringToUTF8(env, dir_full_path),
+      base::android::ConvertJavaStringToUTF8(env, url),
+      base::android::ConvertJavaStringToUTF8(env, content_disposition),
+      base::android::ConvertJavaStringToUTF8(env, user_agent),
+      base::android::ConvertJavaStringToUTF8(env, cookie),
+      base::android::ConvertJavaStringToUTF8(env, referer), has_user_gesture,
+      base::android::ConvertJavaStringToUTF8(env, mime_type), content_length,
+      is_GET_request);
+  PromptUserDoneCB* ref = new PromptUserDoneCB(env, obj);
+
+  TabAndroid* tab_android = TabAndroid::GetNativeTab(env, tab);
+  chrome::android::DownloadOverwriteInfoBarDelegateJavaInitiated::Create(
+      InfoBarService::FromWebContents(tab_android->web_contents()),
+      download_overwrite_info,
+      base::Bind(&PromptUserDoneCB::PromptUserDone, base::Owned(ref)));
+}
+
+bool RegisterChromeDownloadDelegate(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}