arc: Use the MIME type returned by the container to handle content URLs

chrome/browser/chromeos/file_manager/filesystem_api_util.cc

 // Copyright 2014 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/chromeos/file_manager/filesystem_api_util.h"
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
+#include "chrome/browser/chromeos/arc/arc_util.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_file_system_operation_runner.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/file_manager/app_id.h"
 #include "chrome/browser/chromeos/file_manager/fileapi_util.h"
 #include "chrome/browser/chromeos/file_system_provider/mount_path_util.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "components/arc/arc_service_manager.h"
 #include "components/drive/chromeos/file_system_interface.h"
 #include "components/drive/file_errors.h"
 #include "components/drive/file_system_core_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/storage_partition.h"
 #include "google_apis/drive/task_util.h"
 #include "storage/browser/fileapi/file_system_context.h"
 
 namespace file_manager {
 namespace util {
@@ skipping 23 matching lines @@
     base::File::Error result) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   if (result != base::File::FILE_OK || !metadata->mime_type.get()) {
     callback.Run(false, std::string());
     return;
   }
   callback.Run(true, *metadata->mime_type);
 }
 
+// Helper function used to implement GetNonNativeLocalPathMimeType. It passes
+// the returned mime type to the callback.
+void GetMimeTypeAfterGetMimeTypeForArcContentFileSystem(
+    const base::Callback<void(bool, const std::string&)>& callback,

[dcheng, 2017/06/02 15:58:29]

I didn't notice this earlier, but it might be nice to clean this up in a future
CL to just pass an Optional<std::string> to avoid the need to default construct
a std::string() in the false case.

[hashimoto, 2017/06/05 04:08:56]

Sounds good.
Filed crbug.com/729442

+    const base::Optional<std::string>& mime_type) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  if (mime_type.has_value()) {
+    callback.Run(true, mime_type.value());
+  } else {
+    callback.Run(false, std::string());
+  }
+}
+
 // Helper function to converts a callback that takes boolean value to that takes
 // File::Error, by regarding FILE_OK as the only successful value.
 void BoolCallbackAsFileErrorCallback(
     const base::Callback<void(bool)>& callback,
     base::File::Error error) {
   return callback.Run(error == base::File::FILE_OK);
 }
 
 // Part of PrepareFileOnIOThread. It tries to create a new file if the given
 // |url| is not already inhabited.
@@ skipping 102 matching lines @@
 
     parser.file_system()->GetMetadata(
         parser.file_path(),
         chromeos::file_system_provider::ProvidedFileSystemInterface::
             METADATA_FIELD_MIME_TYPE,
         base::Bind(&GetMimeTypeAfterGetMetadataForProvidedFileSystem,
                    callback));
     return;
   }
 
+  if (arc::IsArcAllowedForProfile(profile) &&
+      base::FilePath(arc::kContentFileSystemMountPointPath).IsParent(path)) {
+    GURL arc_url = arc::PathToArcUrl(path);
+    auto* runner = arc::ArcServiceManager::GetGlobalService<
+        arc::ArcFileSystemOperationRunner>();
+    if (!runner) {
+      content::BrowserThread::PostTask(
+          content::BrowserThread::UI, FROM_HERE,
+          base::Bind(callback, false, std::string()));

[mtomasz, 2017/06/05 04:29:55]

nit: BindOnce

[hashimoto, 2017/06/05 04:55:37]

Done.

+      return;
+    }
+    runner->GetMimeType(
+        arc_url, base::Bind(&GetMimeTypeAfterGetMimeTypeForArcContentFileSystem,
+                            callback));
+    return;
+  }
+
   // We don't have a way to obtain metadata other than drive and FSP. Returns an
   // error with empty MIME type, that leads fallback guessing mime type from
   // file extensions.
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE,
       base::BindOnce(callback, false /* failure */, std::string()));
 }
 
 void IsNonNativeLocalPathDirectory(
     Profile* profile,
@@ skipping 34 matching lines @@
       backend->CreateInternalURL(file_system_context.get(), path);
 
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::BindOnce(&PrepareFileOnIOThread, file_system_context, internal_url,
                      google_apis::CreateRelayCallback(callback)));
 }
 
 }  // namespace util
 }  // namespace file_manager