// Copyright (c) 2016 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "shell/browser/electron_permission_manager.h"

#include <memory>
#include <utility>
#include <vector>

#include "base/values.h"
#include "content/browser/permissions/permission_util.h"  // nogncheck
#include "content/public/browser/child_process_security_policy.h"
#include "content/public/browser/global_routing_id.h"
#include "content/public/browser/permission_controller.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "gin/data_object_builder.h"
#include "shell/browser/api/electron_api_web_contents.h"
#include "shell/browser/electron_browser_client.h"
#include "shell/browser/electron_browser_main_parts.h"
#include "shell/browser/web_contents_permission_helper.h"
#include "shell/browser/web_contents_preferences.h"
#include "shell/common/gin_converters/content_converter.h"
#include "shell/common/gin_converters/frame_converter.h"
#include "shell/common/gin_converters/value_converter.h"
#include "shell/common/gin_helper/event_emitter_caller.h"
#include "third_party/blink/public/common/permissions/permission_utils.h"

namespace electron {

namespace {

bool WebContentsDestroyed(content::RenderFrameHost* rfh) {
  content::WebContents* web_contents =
      content::WebContents::FromRenderFrameHost(rfh);
  if (!web_contents)
    return true;
  return web_contents->IsBeingDestroyed();
}

void PermissionRequestResponseCallbackWrapper(
    ElectronPermissionManager::StatusCallback callback,
    const std::vector<blink::mojom::PermissionStatus>& vector) {
  std::move(callback).Run(vector[0]);
}

}  // namespace

class ElectronPermissionManager::PendingRequest {
 public:
  PendingRequest(content::RenderFrameHost* render_frame_host,
                 const std::vector<blink::PermissionType>& permissions,
                 StatusesCallback callback)
      : render_process_id_(render_frame_host->GetProcess()->GetID()),
        render_frame_id_(render_frame_host->GetGlobalId()),
        callback_(std::move(callback)),
        permissions_(permissions),
        results_(permissions.size(), blink::mojom::PermissionStatus::DENIED),
        remaining_results_(permissions.size()) {}

  void SetPermissionStatus(int permission_id,
                           blink::mojom::PermissionStatus status) {
    DCHECK(!IsComplete());

    if (status == blink::mojom::PermissionStatus::GRANTED) {
      const auto permission = permissions_[permission_id];
      if (permission == blink::PermissionType::MIDI_SYSEX) {
        content::ChildProcessSecurityPolicy::GetInstance()
            ->GrantSendMidiSysExMessage(render_process_id_);
      } else if (permission == blink::PermissionType::GEOLOCATION) {
        ElectronBrowserMainParts::Get()
            ->GetGeolocationControl()
            ->UserDidOptIntoLocationServices();
      }
    }

    results_[permission_id] = status;
    --remaining_results_;
  }

  content::RenderFrameHost* GetRenderFrameHost() {
    return content::RenderFrameHost::FromID(render_frame_id_);
  }

  bool IsComplete() const { return remaining_results_ == 0; }

  void RunCallback() {
    if (!callback_.is_null()) {
      std::move(callback_).Run(results_);
    }
  }

 private:
  int render_process_id_;
  content::GlobalRenderFrameHostId render_frame_id_;
  StatusesCallback callback_;
  std::vector<blink::PermissionType> permissions_;
  std::vector<blink::mojom::PermissionStatus> results_;
  size_t remaining_results_;
};

ElectronPermissionManager::ElectronPermissionManager() = default;

ElectronPermissionManager::~ElectronPermissionManager() = default;

void ElectronPermissionManager::SetPermissionRequestHandler(
    const RequestHandler& handler) {
  if (handler.is_null() && !pending_requests_.IsEmpty()) {
    for (PendingRequestsMap::iterator iter(&pending_requests_); !iter.IsAtEnd();
         iter.Advance()) {
      auto* request = iter.GetCurrentValue();
      if (!WebContentsDestroyed(request->GetRenderFrameHost()))
        request->RunCallback();
    }
    pending_requests_.Clear();
  }
  request_handler_ = handler;
}

void ElectronPermissionManager::SetPermissionCheckHandler(
    const CheckHandler& handler) {
  check_handler_ = handler;
}

void ElectronPermissionManager::SetDevicePermissionHandler(
    const DeviceCheckHandler& handler) {
  device_permission_handler_ = handler;
}

void ElectronPermissionManager::RequestPermission(
    blink::PermissionType permission,
    content::RenderFrameHost* render_frame_host,
    const GURL& requesting_origin,
    bool user_gesture,
    StatusCallback response_callback) {
  RequestPermissionWithDetails(permission, render_frame_host, requesting_origin,
                               user_gesture, {}, std::move(response_callback));
}

void ElectronPermissionManager::RequestPermissionWithDetails(
    blink::PermissionType permission,
    content::RenderFrameHost* render_frame_host,
    const GURL& requesting_origin,
    bool user_gesture,
    base::Value::Dict details,
    StatusCallback response_callback) {
  RequestPermissionsWithDetails(
      std::vector<blink::PermissionType>(1, permission), render_frame_host,
      user_gesture, std::move(details),
      base::BindOnce(PermissionRequestResponseCallbackWrapper,
                     std::move(response_callback)));
}

void ElectronPermissionManager::RequestPermissions(
    const std::vector<blink::PermissionType>& permissions,
    content::RenderFrameHost* render_frame_host,
    const GURL& requesting_origin,
    bool user_gesture,
    StatusesCallback response_callback) {
  RequestPermissionsWithDetails(permissions, render_frame_host, user_gesture,
                                {}, std::move(response_callback));
}

void ElectronPermissionManager::RequestPermissionsWithDetails(
    const std::vector<blink::PermissionType>& permissions,
    content::RenderFrameHost* render_frame_host,
    bool user_gesture,
    base::Value::Dict details,
    StatusesCallback response_callback) {
  if (permissions.empty()) {
    std::move(response_callback).Run({});
    return;
  }

  if (request_handler_.is_null()) {
    std::vector<blink::mojom::PermissionStatus> statuses;
    for (auto permission : permissions) {
      if (permission == blink::PermissionType::MIDI_SYSEX) {
        content::ChildProcessSecurityPolicy::GetInstance()
            ->GrantSendMidiSysExMessage(
                render_frame_host->GetProcess()->GetID());
      } else if (permission == blink::PermissionType::GEOLOCATION) {
        ElectronBrowserMainParts::Get()
            ->GetGeolocationControl()
            ->UserDidOptIntoLocationServices();
      }
      statuses.push_back(blink::mojom::PermissionStatus::GRANTED);
    }
    std::move(response_callback).Run(statuses);
    return;
  }

  auto* web_contents =
      content::WebContents::FromRenderFrameHost(render_frame_host);
  int request_id = pending_requests_.Add(std::make_unique<PendingRequest>(
      render_frame_host, permissions, std::move(response_callback)));

  for (size_t i = 0; i < permissions.size(); ++i) {
    auto permission = permissions[i];
    const auto callback =
        base::BindRepeating(&ElectronPermissionManager::OnPermissionResponse,
                            base::Unretained(this), request_id, i);
    details.Set("requestingUrl",
                render_frame_host->GetLastCommittedURL().spec());
    details.Set("isMainFrame", render_frame_host->GetParent() == nullptr);
    request_handler_.Run(web_contents, permission, callback,
                         base::Value(std::move(details)));
  }
}

void ElectronPermissionManager::OnPermissionResponse(
    int request_id,
    int permission_id,
    blink::mojom::PermissionStatus status) {
  auto* pending_request = pending_requests_.Lookup(request_id);
  if (!pending_request)
    return;

  pending_request->SetPermissionStatus(permission_id, status);
  if (pending_request->IsComplete()) {
    pending_request->RunCallback();
    pending_requests_.Remove(request_id);
  }
}

void ElectronPermissionManager::ResetPermission(
    blink::PermissionType permission,
    const GURL& requesting_origin,
    const GURL& embedding_origin) {}

void ElectronPermissionManager::RequestPermissionsFromCurrentDocument(
    const std::vector<blink::PermissionType>& permissions,
    content::RenderFrameHost* render_frame_host,
    bool user_gesture,
    base::OnceCallback<void(const std::vector<blink::mojom::PermissionStatus>&)>
        callback) {
  RequestPermissionsWithDetails(permissions, render_frame_host, user_gesture,
                                {}, std::move(callback));
}

blink::mojom::PermissionStatus ElectronPermissionManager::GetPermissionStatus(
    blink::PermissionType permission,
    const GURL& requesting_origin,
    const GURL& embedding_origin) {
  base::Value::Dict details;
  details.Set("embeddingOrigin", embedding_origin.spec());
  bool granted = CheckPermissionWithDetails(permission, {}, requesting_origin,
                                            std::move(details));
  return granted ? blink::mojom::PermissionStatus::GRANTED
                 : blink::mojom::PermissionStatus::DENIED;
}

ElectronPermissionManager::SubscriptionId
ElectronPermissionManager::SubscribePermissionStatusChange(
    blink::PermissionType permission,
    content::RenderProcessHost* render_process_host,
    content::RenderFrameHost* render_frame_host,
    const GURL& requesting_origin,
    base::RepeatingCallback<void(blink::mojom::PermissionStatus)> callback) {
  return SubscriptionId(-1);
}

void ElectronPermissionManager::UnsubscribePermissionStatusChange(
    SubscriptionId id) {}

bool ElectronPermissionManager::CheckPermissionWithDetails(
    blink::PermissionType permission,
    content::RenderFrameHost* render_frame_host,
    const GURL& requesting_origin,
    base::Value::Dict details) const {
  if (check_handler_.is_null()) {
    return true;
  }
  auto* web_contents =
      render_frame_host
          ? content::WebContents::FromRenderFrameHost(render_frame_host)
          : nullptr;
  if (render_frame_host) {
    details.Set("requestingUrl",
                render_frame_host->GetLastCommittedURL().spec());
  }
  details.Set("isMainFrame",
              render_frame_host && render_frame_host->GetParent() == nullptr);
  switch (permission) {
    case blink::PermissionType::AUDIO_CAPTURE:
      details.Set("mediaType", "audio");
      break;
    case blink::PermissionType::VIDEO_CAPTURE:
      details.Set("mediaType", "video");
      break;
    default:
      break;
  }
  return check_handler_.Run(web_contents, permission, requesting_origin,
                            base::Value(std::move(details)));
}

bool ElectronPermissionManager::CheckDevicePermission(
    blink::PermissionType permission,
    const url::Origin& origin,
    const base::Value& device,
    ElectronBrowserContext* browser_context) const {
  if (device_permission_handler_.is_null()) {
    return browser_context->CheckDevicePermission(origin, device, permission);
  } else {
    v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
    v8::HandleScope scope(isolate);
    v8::Local<v8::Object> details = gin::DataObjectBuilder(isolate)
                                        .Set("deviceType", permission)
                                        .Set("origin", origin.Serialize())
                                        .Set("device", device.Clone())
                                        .Build();
    return device_permission_handler_.Run(details);
  }
}

void ElectronPermissionManager::GrantDevicePermission(
    blink::PermissionType permission,
    const url::Origin& origin,
    const base::Value& device,
    ElectronBrowserContext* browser_context) const {
  if (device_permission_handler_.is_null()) {
    browser_context->GrantDevicePermission(origin, device, permission);
  }
}

void ElectronPermissionManager::RevokeDevicePermission(
    blink::PermissionType permission,
    const url::Origin& origin,
    const base::Value& device,
    ElectronBrowserContext* browser_context) const {
  browser_context->RevokeDevicePermission(origin, device, permission);
}

blink::mojom::PermissionStatus
ElectronPermissionManager::GetPermissionStatusForCurrentDocument(
    blink::PermissionType permission,
    content::RenderFrameHost* render_frame_host) {
  return GetPermissionStatus(
      permission, render_frame_host->GetLastCommittedOrigin().GetURL(),
      content::PermissionUtil::GetLastCommittedOriginAsURL(render_frame_host));
}

blink::mojom::PermissionStatus
ElectronPermissionManager::GetPermissionStatusForWorker(
    blink::PermissionType permission,
    content::RenderProcessHost* render_process_host,
    const GURL& worker_origin) {
  return GetPermissionStatus(permission, worker_origin, worker_origin);
}

}  // namespace electron