Refactor download image-MIME-type-detection code.

chrome/browser/chromeos/note_taking_app_utils.cc

Index: chrome/browser/chromeos/note_taking_app_utils.cc
diff --git a/chrome/browser/chromeos/note_taking_app_utils.cc b/chrome/browser/chromeos/note_taking_app_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ff06087d71cc1dc27faed4eb54a170020b0bc3c9
--- /dev/null
+++ b/chrome/browser/chromeos/note_taking_app_utils.cc
@@ -0,0 +1,83 @@
+// 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/chromeos/note_taking_app_utils.h"
+
+#include <string>
+#include <vector>
+
+#include "apps/launcher.h"
+#include "ash/common/system/chromeos/palette/palette_utils.h"
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/strings/string_split.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chromeos/chromeos_switches.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/common/extension.h"
+#include "url/gurl.h"
+
+namespace chromeos {
+namespace {
+
+// TODO(derat): Add more IDs.
+const char* const kExtensionIds[] = {
+    "hmjkmjkepdijhoojdojkdfohbdgmmhki",  // Google Keep app (Web Store)
+};
+
+// Returns the first installed and enabled whitelisted note-taking app, or null
+// if none is installed.
+// TODO(derat): Instead of a using hardcoded list of IDs, use an app designated
+// by a pref.
+const extensions::Extension* GetApp(Profile* profile) {
+  std::vector<std::string> ids;
+
+  const std::string switch_value =
+      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kNoteTakingAppIds);
+  if (!switch_value.empty()) {
+    ids = base::SplitString(switch_value, ",", base::TRIM_WHITESPACE,
+                            base::SPLIT_WANT_NONEMPTY);
+  } else {
+    ids.assign(kExtensionIds, kExtensionIds + arraysize(kExtensionIds));
+  }
+
+  const extensions::ExtensionRegistry* extension_registry =
+      extensions::ExtensionRegistry::Get(profile);
+  const extensions::ExtensionSet& enabled_extensions =
+      extension_registry->enabled_extensions();
+  for (const auto& id : ids) {
+    if (enabled_extensions.Contains(id)) {
+      return extension_registry->GetExtensionById(
+          id, extensions::ExtensionRegistry::ENABLED);
+    }
+  }
+  return nullptr;
+}
+
+}  // namespace
+
+bool IsNoteTakingAppAvailable(Profile* profile) {
+  DCHECK(profile);
+  return ash::IsPaletteEnabled() && GetApp(profile);
+}
+
+void LaunchNoteTakingAppForNewNote(Profile* profile,
+                                   const base::FilePath& path) {
+  DCHECK(profile);
+  const extensions::Extension* app = GetApp(profile);
+  if (!app) {
+    LOG(ERROR) << "Failed to find note-taking app";
+    return;
+  }
+
+  // TODO: Launch with an "action" launch source and the appropriate action type
+  // to create a new note once that's been added to chrome.appRuntime.
+  if (path.empty())
+    apps::LaunchPlatformApp(profile, app, extensions::SOURCE_UNTRACKED);
+  else
+    apps::LaunchPlatformAppWithPath(profile, app, path);
+}
+
+}  // namespace chromeos