Public Sessions - prompt the user for pageCapture requests

chrome/browser/chromeos/extensions/public_session_permission_helper.h

+// Copyright 2017 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_PUBLIC_SESSION_PERMISSION_HELPER_H_
+#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_PUBLIC_SESSION_PERMISSION_HELPER_H_
+
+#include <map>
+#include <set>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "extensions/common/extension_id.h"
+#include "extensions/common/permissions/api_permission.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace extensions {
+
+class Extension;
+
+class PublicSessionPermissionHelperImpl;
+enum PermissionState {

[Devlin, 2017/01/25 16:00:32]

Let's put this in the class.

[Ivan Šandrk, 2017/01/26 18:53:22]

Removed completely.

+  NOT_PROMPTED = 0,
+  SHOWN_PROMPT,
+  ALLOWED,
+  DENIED
+};
+using PermissionHelperSet = std::set<APIPermission::ID>;
+
+class PublicSessionPermissionHelper {
+ public:
+  static PublicSessionPermissionHelper& Instance();
+
+  // Sets up the prompt asking the user for additional permission(s), handles
+  // the result, caches it, and then runs either success_callback or
+  // failure_callback depending on all permissions being allowed.
+  // Supports handling multiple requests for the same permission(s). Only the
+  // first request causes the prompt to be shown, subsequent ones are just
+  // enqueued to be called when the permission(s) is resolved.
+  // Caller must ensure that web_contents is valid. Must be called on UI thread.
+  // If finer resolving is needed, pass the same function in both callbacks and
+  // check the individual permissions by calling GetUserChoice inside your
+  // function.
+  void HandlePermissionRequest(const Extension* extension,

[Devlin, 2017/01/25 16:00:32]

nit: it seems like we can have these two functions be static, and avoid
surfacing the instance (which seems to be an implementation detail).

[Ivan Šandrk, 2017/01/26 18:53:22]

Done.

+                               PermissionHelperSet requested_permissions,
+                               content::WebContents* web_contents,
+                               const base::Closure& success_callback,
+                               const base::Closure& failure_callback);
+
+  PermissionState GetUserChoice(ExtensionId extension_id,
+                                APIPermission::ID permission_id);
+
+ private:
+  PublicSessionPermissionHelper();
+  ~PublicSessionPermissionHelper();
+
+  std::map<ExtensionId, PublicSessionPermissionHelperImpl> impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(PublicSessionPermissionHelper);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_PUBLIC_SESSION_PERMISSION_HELPER_H_