Revert of Move file_handlers API from //chrome to //extensions

extensions/browser/api/file_handlers/mime_util.cc

Index: extensions/browser/api/file_handlers/mime_util.cc
diff --git a/extensions/browser/api/file_handlers/mime_util.cc b/extensions/browser/api/file_handlers/mime_util.cc
deleted file mode 100644
index 90a8841cf9ce2af881cd060674f89d0d359ea389..0000000000000000000000000000000000000000
--- a/extensions/browser/api/file_handlers/mime_util.cc
+++ /dev/null
@@ -1,212 +0,0 @@
-// Copyright 2013 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 "extensions/browser/api/file_handlers/mime_util.h"
-
-#include "base/files/file_path.h"
-#include "base/files/file_util.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "build/build_config.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/browser_thread.h"
-#include "net/base/filename_util.h"
-#include "net/base/mime_sniffer.h"
-#include "net/base/mime_util.h"
-#include "storage/browser/fileapi/file_system_url.h"
-
-#if defined(OS_CHROMEOS)
-#include "extensions/browser/api/extensions_api_client.h"
-#include "extensions/browser/api/file_handlers/non_native_file_system_delegate.h"
-#endif
-
-using content::BrowserThread;
-
-namespace {
-
-const char kMimeTypeApplicationOctetStream[] = "application/octet-stream";
-
-}  // namespace
-
-namespace extensions {
-namespace app_file_handler_util {
-namespace {
-
-// Detects MIME type by reading initial bytes from the file. If found, then
-// writes the MIME type to |result|.
-void SniffMimeType(const base::FilePath& local_path, std::string* result) {
-  std::vector<char> content(net::kMaxBytesToSniff);
-
-  const int bytes_read =
-      base::ReadFile(local_path, &content[0], static_cast<int>(content.size()));
-
-  if (bytes_read >= 0) {
-    net::SniffMimeType(&content[0], bytes_read,
-                       net::FilePathToFileURL(local_path),
-                       std::string(),  // type_hint (passes no hint)
-                       result);
-  }
-}
-
-#if defined(OS_CHROMEOS)
-// Converts a result passed as a scoped pointer to a dereferenced value passed
-// to |callback|.
-void OnGetMimeTypeFromFileForNonNativeLocalPathCompleted(
-    std::unique_ptr<std::string> mime_type,
-    const base::Callback<void(const std::string&)>& callback) {
-  callback.Run(*mime_type);
-}
-
-// Called when fetching MIME type for a non-native local path is completed.
-// If |success| is false, then tries to guess the MIME type by looking at the
-// file name.
-void OnGetMimeTypeFromMetadataForNonNativeLocalPathCompleted(
-    const base::FilePath& local_path,
-    const base::Callback<void(const std::string&)>& callback,
-    bool success,
-    const std::string& mime_type) {
-  if (success) {
-    callback.Run(mime_type);
-    return;
-  }
-
-  // MIME type not available with metadata, hence try to guess it from the
-  // file's extension.
-  std::unique_ptr<std::string> mime_type_from_extension(new std::string);
-  std::string* const mime_type_from_extension_ptr =
-      mime_type_from_extension.get();
-  BrowserThread::PostBlockingPoolTaskAndReply(
-      FROM_HERE, base::Bind(base::IgnoreResult(&net::GetMimeTypeFromFile),
-                            local_path, mime_type_from_extension_ptr),
-      base::Bind(&OnGetMimeTypeFromFileForNonNativeLocalPathCompleted,
-                 base::Passed(&mime_type_from_extension), callback));
-}
-#endif
-
-// Called when sniffing for MIME type in the native local file is completed.
-void OnSniffMimeTypeForNativeLocalPathCompleted(
-    std::unique_ptr<std::string> mime_type,
-    const base::Callback<void(const std::string&)>& callback) {
-  // Do not return application/zip as sniffed result. If the file has .zip
-  // extension, it should be already returned as application/zip. If the file
-  // does not have .zip extension and couldn't find mime type from the
-  // extension, it might be unknown internally zipped file.
-  if (*mime_type == "application/zip") {
-    callback.Run(kMimeTypeApplicationOctetStream);
-    return;
-  }
-
-  callback.Run(*mime_type);
-}
-
-}  // namespace
-
-// Handles response of net::GetMimeTypeFromFile for native file systems. If
-// MIME type is available, then forwards it to |callback|. Otherwise, fallbacks
-// to sniffing.
-void OnGetMimeTypeFromFileForNativeLocalPathCompleted(
-    const base::FilePath& local_path,
-    std::unique_ptr<std::string> mime_type,
-    const base::Callback<void(const std::string&)>& callback) {
-  if (!mime_type->empty()) {
-    callback.Run(*mime_type);
-    return;
-  }
-
-  std::unique_ptr<std::string> sniffed_mime_type(
-      new std::string(kMimeTypeApplicationOctetStream));
-  std::string* const sniffed_mime_type_ptr = sniffed_mime_type.get();
-  BrowserThread::PostBlockingPoolTaskAndReply(
-      FROM_HERE, base::Bind(&SniffMimeType, local_path, sniffed_mime_type_ptr),
-      base::Bind(&OnSniffMimeTypeForNativeLocalPathCompleted,
-                 base::Passed(&sniffed_mime_type), callback));
-}
-
-// Fetches MIME type for a local path and returns it with a |callback|.
-void GetMimeTypeForLocalPath(
-    content::BrowserContext* context,
-    const base::FilePath& local_path,
-    const base::Callback<void(const std::string&)>& callback) {
-#if defined(OS_CHROMEOS)
-  NonNativeFileSystemDelegate* delegate =
-      ExtensionsAPIClient::Get()->GetNonNativeFileSystemDelegate();
-  if (delegate && delegate->IsUnderNonNativeLocalPath(context, local_path)) {
-    // For non-native files, try to get the MIME type from metadata. If not
-    // available, then try to guess from the extension. Never sniff (because
-    // it can be very slow).
-    delegate->GetNonNativeLocalPathMimeType(
-        context, local_path,
-        base::Bind(&OnGetMimeTypeFromMetadataForNonNativeLocalPathCompleted,
-                   local_path, callback));
-    return;
-  }
-#endif
-
-  // For native local files, try to guess the mime from the extension. If
-  // not available, then try to sniff if.
-  std::unique_ptr<std::string> mime_type_from_extension(new std::string);
-  std::string* const mime_type_from_extension_ptr =
-      mime_type_from_extension.get();
-  BrowserThread::PostBlockingPoolTaskAndReply(
-      FROM_HERE, base::Bind(base::IgnoreResult(&net::GetMimeTypeFromFile),
-                            local_path, mime_type_from_extension_ptr),
-      base::Bind(&OnGetMimeTypeFromFileForNativeLocalPathCompleted, local_path,
-                 base::Passed(&mime_type_from_extension), callback));
-}
-
-MimeTypeCollector::MimeTypeCollector(content::BrowserContext* context)
-    : context_(context), left_(0), weak_ptr_factory_(this) {}
-
-MimeTypeCollector::~MimeTypeCollector() {}
-
-void MimeTypeCollector::CollectForURLs(
-    const std::vector<storage::FileSystemURL>& urls,
-    const CompletionCallback& callback) {
-  std::vector<base::FilePath> local_paths;
-  for (size_t i = 0; i < urls.size(); ++i) {
-    local_paths.push_back(urls[i].path());
-  }
-
-  CollectForLocalPaths(local_paths, callback);
-}
-
-void MimeTypeCollector::CollectForLocalPaths(
-    const std::vector<base::FilePath>& local_paths,
-    const CompletionCallback& callback) {
-  DCHECK(!callback.is_null());
-  callback_ = callback;
-
-  DCHECK(!result_.get());
-  result_.reset(new std::vector<std::string>(local_paths.size()));
-  left_ = local_paths.size();
-
-  if (!left_) {
-    // Nothing to process.
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::Bind(callback_, base::Passed(&result_)));
-    callback_ = CompletionCallback();
-    return;
-  }
-
-  for (size_t i = 0; i < local_paths.size(); ++i) {
-    GetMimeTypeForLocalPath(context_, local_paths[i],
-                            base::Bind(&MimeTypeCollector::OnMimeTypeCollected,
-                                       weak_ptr_factory_.GetWeakPtr(), i));
-  }
-}
-
-void MimeTypeCollector::OnMimeTypeCollected(size_t index,
-                                            const std::string& mime_type) {
-  (*result_)[index] = mime_type;
-  if (!--left_) {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::Bind(callback_, base::Passed(&result_)));
-    // Release the callback to avoid a circullar reference in case an instance
-    // of this class is a member of a ref counted class, which instance is bound
-    // to this callback.
-    callback_ = CompletionCallback();
-  }
-}
-
-}  // namespace app_file_handler_util
-}  // namespace extensions