content: package act.view;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import act.app.ActionContext;
  import act.app.App;
  import act.conf.AppConfig;
  import act.mail.MailerContext;
  import act.security.CSRF;
  import act.util.ActContext;
  import org.osgl.http.H;
  import org.osgl.util.C;
  import org.rythmengine.utils.RawData;
  import org.rythmengine.utils.S;
  
  import javax.mail.internet.InternetAddress;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  
  /**
   * Define system implicit variables
   */
  public class SystemImplicitVariableProvider extends ImplicitVariableProvider {
      @Override
      public List<ActionViewVarDef> implicitActionViewVariables() {
          return actionViewVarDefs;
      }
  
      @Override
      public List<MailerViewVarDef> implicitMailerViewVariables() {
          return mailerViewVarDefs;
      }
  
      private List<ActionViewVarDef> actionViewVarDefs = C.listOf(
              new ActionViewVarDef("_app", App.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context.app();
                  }
              },
              new ActionViewVarDef("_conf", AppConfig.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context.config();
                  }
              },
              new ActionViewVarDef("_ctx", ActContext.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context;
                  }
              },
              new ActionViewVarDef("_action", ActionContext.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context;
                  }
              },
              new ActionViewVarDef("_req", H.Request.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context.req();
                  }
              },
              new ActionViewVarDef("_resp", H.Response.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context.resp();
                  }
              },
              new ActionViewVarDef("_mailer", MailerContext.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return null;
                  }
              },
              new ActionViewVarDef("_session", H.Session.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context.session();
                  }
              },
              new ActionViewVarDef("_flash", H.Flash.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context.flash();
                  }
              },
              new ActionViewVarDef("_params", Map.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return context.allParams();
                  }
              },
              new ActionViewVarDef("_csrf", String.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return CSRF.token(context);
                  }
              },
              new ActionViewVarDef("_csrfField", RawData.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return S.raw(CSRF.formField(context));
                  }
              },
              new ActionViewVarDef("_dspToken", String.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      return dspToken(context);
                  }
              },
              new ActionViewVarDef("_dspField", RawData.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      String dsp = dspToken(context);
                      return S.raw(new StringBuilder("<a type='hidden' name='").append(context.config().dspToken())
                              .append("' value='").append(dsp).append("'>"));
                  }
              },
              new ActionViewVarDef("_lang", String.class) {
                  @Override
                  public Object eval(ActionContext context) {
                      Locale locale = context.locale(true);
                      return locale.toString().replace('_', '-');
                  }
              }
      );
  
      private String dspToken(ActionContext context) {
          String dsp = context.attribute("__dsp__");
          if (null == dsp) {
              dsp = S.random(6);
              context.attribute("__dsp__", dsp);
          }
          return dsp;
      }
  
      private List<MailerViewVarDef> mailerViewVarDefs = C.listOf(
              new MailerViewVarDef("_app", App.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context.app();
                  }
              },
              new MailerViewVarDef("_conf", AppConfig.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context.config();
                  }
              },
              new MailerViewVarDef("_ctx", ActContext.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context;
                  }
              },
              new MailerViewVarDef("_mailer", MailerContext.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context;
                  }
              },
              new MailerViewVarDef("_action", ActionContext.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return null;
                  }
              },
              new MailerViewVarDef("_from", InternetAddress.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context.from();
                  }
              },
              new MailerViewVarDef("_to", List.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context.to();
                  }
              },
              new MailerViewVarDef("_cc", List.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context.cc();
                  }
              },
              new MailerViewVarDef("_bcc", List.class) {
                  @Override
                  public Object eval(MailerContext context) {
                      return context.bcc();
                  }
              }
      );
  }
  