Add extension system and PDF viewer to Qt WebEngine

Adds the Chromium extensiuon system to Qt WebEngine.
Currently, it only exposes internal APIs to the internal
PDF viewer extension.

To load a PDF, simply navigate to it.

This feature can be configured via the webengine-extensions flag
and is turned on by default.

Needs patch in Chromium 71-based to build.

Adaptations to 71-based from 69-based include:
  * Flag out update installation, add crx file dependency
  * Move PostTask over to 71-based implementation
  * Move extensions API providers to 71-based implementaion
  * Don't use custom guest view and mime handler view delegates
  * Adapt the URLRequestResourceBundleJob to match new interface
  * Move extension system initialization to end of profile constructor

Change-Id: I4fa5149057291bb5847f048534c11820cd7ff58c
Fixes: QTBUG-50556
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

2 files changed, 243 insertions, 0 deletions

diff --git a/src/core/renderer_host/resource_dispatcher_host_delegate_qt.cpp b/src/core/renderer_host/resource_dispatcher_host_delegate_qt.cpp
new file mode 100644
index 000000000..0583060c6
--- /dev/null
+++ b/src/core/renderer_host/resource_dispatcher_host_delegate_qt.cpp
@@ -0,0 +1,166 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// 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.Chromium file.
+
+#include "resource_dispatcher_host_delegate_qt.h"
+
+#include "base/bind.h"
+#include "base/guid.h"
+#include "base/strings/stringprintf.h"
+#include "base/task/post_task.h"
+#include "content/public/browser/browser_task_traits.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/navigation_controller.h"
+
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/resource_dispatcher_host.h"
+#include "content/public/browser/resource_request_info.h"
+#include "content/public/browser/stream_info.h"
+#include "content/public/browser/web_contents.h"
+
+#include "extensions/extension_system_qt.h"
+#include "extensions/browser/info_map.h"
+#include "extensions/common/constants.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/manifest_handlers/mime_types_handler.h"
+
+#include "net/base/escape.h"
+#include "net/url_request/url_request.h"
+
+#include "resource_context_qt.h"
+#include "type_conversion.h"
+
+namespace QtWebEngineCore {
+
+void OnPdfStreamIntercepted(
+    const GURL& original_url,
+    std::string extension_id,
+    int frame_tree_node_id,
+    const content::ResourceRequestInfo::WebContentsGetter&
+        web_contents_getter) {
+    content::WebContents* web_contents = web_contents_getter.Run();
+    if (!web_contents)
+        return;
+
+    // The URL passes the original pdf resource url, that will be requested
+    // by the pdf viewer extension page.
+    content::NavigationController::LoadURLParams params(
+              GURL(base::StringPrintf("%s://%s/index.html?%s", extensions::kExtensionScheme,
+                   extension_id.c_str(),
+                   net::EscapeUrlEncodedData(original_url.spec(), false).c_str())));
+
+    params.frame_tree_node_id = frame_tree_node_id;
+    web_contents->GetController().LoadURLWithParams(params);
+}
+
+bool ResourceDispatcherHostDelegateQt::ShouldInterceptResourceAsStream(net::URLRequest *request,
+                                                                       const std::string &mime_type,
+                                                                       GURL *origin,
+                                                                       std::string *payload)
+{
+    const content::ResourceRequestInfo* info =
+        content::ResourceRequestInfo::ForRequest(request);
+
+    int render_process_host_id = -1;
+    int render_frame_id = -1;
+    if (!content::ResourceRequestInfo::GetRenderFrameForRequest(request, &render_process_host_id, &render_frame_id)) {
+      return false;
+    }
+
+    ResourceContextQt *context = static_cast<ResourceContextQt *>(info->GetContext());
+    std::vector<std::string> whitelist = MimeTypesHandler::GetMIMETypeWhitelist();
+
+    extensions::ExtensionSystemQt *extensionSystem = context->GetExtensionSystem();
+    if (!extensionSystem)
+        return false;
+
+    const scoped_refptr<const extensions::InfoMap> extension_info_map(extensionSystem->info_map());
+
+    for (const std::string &extension_id : whitelist) {
+        const extensions::Extension *extension = extension_info_map->extensions().GetByID(extension_id);
+        if (!extension)
+            continue;
+
+        MimeTypesHandler* handler = MimeTypesHandler::GetHandler(extension);
+        if (!handler)
+            continue;
+        if (handler->CanHandleMIMEType(mime_type)) {
+            StreamTargetInfo target_info;
+            *origin = extensions::Extension::GetBaseURLFromExtensionId(extension_id);
+            target_info.extension_id = extension_id;
+            target_info.view_id = base::GenerateGUID();
+            *payload = target_info.view_id;
+            stream_target_info_[request] = target_info;
+            return true;
+        }
+    }
+    return false;
+}
+
+// Informs the delegate that a Stream was created. The Stream can be read from
+// the blob URL of the Stream, but can only be read once.
+void ResourceDispatcherHostDelegateQt::OnStreamCreated(net::URLRequest *request,
+                                                       std::unique_ptr<content::StreamInfo> stream)
+{
+    const content::ResourceRequestInfo *info = content::ResourceRequestInfo::ForRequest(request);
+    std::map<net::URLRequest *, StreamTargetInfo>::iterator ix = stream_target_info_.find(request);
+    CHECK(ix != stream_target_info_.end());
+    int render_frame_id = -1;
+    int render_process_id = -1;
+    if (!content::ResourceRequestInfo::GetRenderFrameForRequest(request, &render_process_id, &render_frame_id)) {
+        stream_target_info_.erase(request);
+        request->Cancel();
+        return;
+    }
+
+    base::PostTaskWithTraits(
+          FROM_HERE, {content::BrowserThread::UI},
+                base::BindOnce(&OnPdfStreamIntercepted,
+                               request->url(), ix->second.extension_id,
+                               info->GetFrameTreeNodeId(), info->GetWebContentsGetterForRequest()
+                              )
+                );
+    stream_target_info_.erase(request);
+}
+
+} // namespace QtWebEngineCore
diff --git a/src/core/renderer_host/resource_dispatcher_host_delegate_qt.h b/src/core/renderer_host/resource_dispatcher_host_delegate_qt.h
new file mode 100644
index 000000000..3039fd03e
--- /dev/null
+++ b/src/core/renderer_host/resource_dispatcher_host_delegate_qt.h
@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef RESOURCE_DISPATCHER_HOST_DELEGATE_QT_H
+#define RESOURCE_DISPATCHER_HOST_DELEGATE_QT_H
+
+#include "content/public/browser/resource_dispatcher_host_delegate.h"
+#include "extensions/buildflags/buildflags.h"
+
+#include "web_contents_adapter_client.h"
+
+namespace QtWebEngineCore {
+
+class ResourceDispatcherHostDelegateQt : public content::ResourceDispatcherHostDelegate {
+public:
+    // If the stream will be rendered in a BrowserPlugin, |payload| will contain
+    // the data that should be given to the old ResourceHandler to forward to the
+    // renderer process.
+    bool ShouldInterceptResourceAsStream(net::URLRequest *request,
+                                         const std::string &mime_type,
+                                         GURL *origin,
+                                         std::string *payload) override;
+
+    // Informs the delegate that a Stream was created. The Stream can be read from
+    // the blob URL of the Stream, but can only be read once.
+    void OnStreamCreated(net::URLRequest *request,
+                         std::unique_ptr<content::StreamInfo> stream) override;
+private:
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+    struct StreamTargetInfo {
+        std::string extension_id;
+        std::string view_id;
+    };
+    std::map<net::URLRequest *, StreamTargetInfo> stream_target_info_;
+#endif
+
+};
+
+} // namespace QtWebEngineCore
+
+#endif // RESOURCE_DISPATCHER_HOST_DELEGATE_QT_H