webview_universal/linux/webview_universal_plugin.cc

#include "include/webview_universal/webview_universal_plugin.h"

#include <flutter_linux/flutter_linux.h>
#include <gtk/gtk.h>

#include <memory>
#include <cstring>
#include <map>

#include <webkit2/webkit2.h>

#include "webview_window.h"
#include "message_channel_plugin.h"

namespace {

int64_t next_window_id_ = 0;

}

#define WEBVIEW_WINDOW_PLUGIN(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj), webview_window_plugin_get_type(), \
                              WebviewWindowPlugin))

struct _WebviewWindowPlugin {
  GObject parent_instance;
  FlMethodChannel *method_channel;
  std::map<int64_t, std::unique_ptr<WebviewWindow>> *windows;
};

G_DEFINE_TYPE(WebviewWindowPlugin, webview_window_plugin, g_object_get_type())

// Called when a method call is received from Flutter.
static void webview_window_plugin_handle_method_call(
    WebviewWindowPlugin *self,
    FlMethodCall *method_call) {

  const gchar *method = fl_method_call_get_name(method_call);

  if (strcmp(method, "create") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "create args is not map", nullptr, nullptr);
      return;
    }
    auto width = fl_value_get_int(fl_value_lookup_string(args, "windowWidth"));
    auto height = fl_value_get_int(fl_value_lookup_string(args, "windowHeight"));
    auto title = fl_value_get_string(fl_value_lookup_string(args, "title"));
    auto title_bar_height = fl_value_get_int(fl_value_lookup_string(args, "titleBarHeight"));

    auto window_id = next_window_id_;
    g_object_ref(self);
    auto webview = std::make_unique<WebviewWindow>(
        self->method_channel, window_id,
        [self, window_id]() {
          self->windows->erase(window_id);
          g_object_unref(self);
        }, title, width, height, title_bar_height);
    self->windows->insert({window_id, std::move(webview)});
    next_window_id_++;
    fl_method_call_respond_success(method_call, fl_value_new_int(window_id), nullptr);
  } else if (strcmp(method, "launch") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "create args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    auto url = fl_value_get_string(fl_value_lookup_string(args, "url"));

    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }

    self->windows->at(window_id)->Navigate(url);
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "addScriptToExecuteOnDocumentCreated") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    auto java_script = fl_value_get_string(fl_value_lookup_string(args, "javaScript"));

    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    self->windows->at(window_id)->RunJavaScriptWhenContentReady(java_script);
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "clearAll") == 0) {
    for (const auto &item: *self->windows) {
      item.second->Close();
    }
    // If application didn't create a webview, but we called webkit_website_data_manager_clear, there will be a segment fault.
    // To avoid crash, we create a fake webview first and then clear all data.
    auto *web_view = webkit_web_view_new();
    auto *context = webkit_web_view_get_context(WEBKIT_WEB_VIEW(web_view));
    auto *website_data_manager = webkit_web_context_get_website_data_manager(context);
    webkit_website_data_manager_clear(website_data_manager, WEBKIT_WEBSITE_DATA_ALL, 0,
                                      nullptr, nullptr, nullptr);
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "setApplicationNameForUserAgent") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call,
                                   "0",
                                   "setApplicationNameForUserAgent args is not map",
                                   nullptr,
                                   nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    auto application_name = fl_value_get_string(fl_value_lookup_string(args, "applicationName"));

    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    self->windows->at(window_id)->SetApplicationNameForUserAgent(application_name);
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "back") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "back args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    self->windows->at(window_id)->GoBack();
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "forward") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "forward args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    self->windows->at(window_id)->GoForward();
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "reload") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "reload args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    self->windows->at(window_id)->Reload();
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "stop") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "stop args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    self->windows->at(window_id)->StopLoading();
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "close") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "close args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    self->windows->at(window_id)->Close();
    fl_method_call_respond_success(method_call, nullptr, nullptr);
  } else if (strcmp(method, "evaluateJavaScript") == 0) {
    auto *args = fl_method_call_get_args(method_call);
    if (fl_value_get_type(args) != FL_VALUE_TYPE_MAP) {
      fl_method_call_respond_error(method_call, "0", "evaluateJavaScript args is not map", nullptr, nullptr);
      return;
    }
    auto window_id = fl_value_get_int(fl_value_lookup_string(args, "viewId"));
    if (!self->windows->count(window_id)) {
      fl_method_call_respond_error(method_call, "0", "can not found webview for viewId", nullptr, nullptr);
      return;
    }
    auto *js = fl_value_get_string(fl_value_lookup_string(args, "javaScriptString"));
    self->windows->at(window_id)->EvaluateJavaScript(js, method_call);
  } else {
    fl_method_call_respond_not_implemented(method_call, nullptr);
  }

}

static void webview_window_plugin_dispose(GObject *object) {
  delete WEBVIEW_WINDOW_PLUGIN(object)->windows;
  g_object_unref(WEBVIEW_WINDOW_PLUGIN(object)->method_channel);
  G_OBJECT_CLASS(webview_window_plugin_parent_class)->dispose(object);
}

static void webview_window_plugin_class_init(WebviewWindowPluginClass *klass) {
  G_OBJECT_CLASS(klass)->dispose = webview_window_plugin_dispose;
}

static void webview_window_plugin_init(WebviewWindowPlugin *self) {
  self->windows = new std::map<int64_t, std::unique_ptr<WebviewWindow>>();
}

static void method_call_cb(FlMethodChannel *channel, FlMethodCall *method_call,
                           gpointer user_data) {
  WebviewWindowPlugin *plugin = WEBVIEW_WINDOW_PLUGIN(user_data);
  webview_window_plugin_handle_method_call(plugin, method_call);
}

void webview_universal_plugin_register_with_registrar(FlPluginRegistrar *registrar) {
  client_message_channel_plugin_register_with_registrar(registrar);

  WebviewWindowPlugin *plugin = WEBVIEW_WINDOW_PLUGIN(
      g_object_new(webview_window_plugin_get_type(), nullptr));

  g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new();
  g_autoptr(FlMethodChannel) channel =
      fl_method_channel_new(fl_plugin_registrar_get_messenger(registrar),
                            "webview_window",
                            FL_METHOD_CODEC(codec));
  g_object_ref(channel);
  plugin->method_channel = channel;
  fl_method_channel_set_method_call_handler(channel, method_call_cb,
                                            g_object_ref(plugin),
                                            g_object_unref);

  g_object_unref(plugin);
}