SugarCE问题点记录

问：如何获取module参数？如果module参数不存在，如何处理？
答：首先检查$_REQUEST['module']，然后再检查$sugar_config['default_module']是否有设置，如果都没有则用SugarApplication类的实例变量$default_module(默认为Home)。这些在SugarApplication::execute()函数的开头进行处理：

if (!empty($sugar_config['default_module']))
    $this->default_module = $sugar_config['default_module'];
$module = $this->default_module;
if (!empty($_REQUEST['module']))
    $module = $_REQUEST['module'];

问：获得module后，会去创建控制器类，在哪里找到该类？
答：ControllerFactory::getController($module)函数负责创建控制器类：

function getController($module) {
    $class = ucfirst($module).'Controller';
    $customClass = 'Custom' . $class;
    if (file_exists('custom/modules/'.$module.'/controller.php')){
        $customClass = 'Custom' . $class;
        require_once('custom/modules/'.$module.'/controller.php');
        if (class_exists($customClass)) {
            $controller = new $customClass();
        } else if (class_exists($class)) {
            $controller = new $class();
        }
    } elseif (file_exists('modules/'.$module.'/controller.php')) {
        require_once('modules/'.$module.'/controller.php');
        if (class_exists($customClass)) {
            $controller = new $customClass();
        } else if (class_exists($class)) {
            $controller = new $class();
        }
    } else {
        if (file_exists('custom/include/MVC/Controller/SugarController.php')) {
            require_once('custom/include/MVC/Controller/SugarController.php');
        }
        if (class_exists('CustomSugarController')){
            $controller = new CustomSugarController();
        } else {
            $controller = new SugarController();
        }
    }
    //setup the controller
    $controller->setup($module);
}

从代码分析，ControllerFactory按照下列顺序寻找控制器类：

• custom/modules/{module}/controller.php，检查Custom{Module}Controller类是否存在，若不存在，再检查{Module}Controller类是否存在。
• modules/{module}/controller.php，检查Custom{Module}Controller类是否存在，若不存在，再检查{Module}Controller类是否存在。
• custom/include/MVC/Controller/SugarController.php，检查CustomSugarController类是否存在，若不存在，再检查SugarController类是否存在。
• include/MVC/Controller/SugarController.php，检查CustomSugarController类是否存在，若不存在，再检查SugarController类是否存在。

问：如何获取action参数？如果action参数不存在，如何处理？
答：action参数对应到SugarController的$action实例变量，该实例变量默认值为index:

class SugarController{
    /**
     * The name of the current action.
     */
    public $action = 'index';
}

当控制器setup()时调用loadPropertiesFromRequest()获取$_REQUEST中的action参数:

public function setup($module = ''){
    ......
    //set properties on the controller from the $_REQUEST
    $this->loadPropertiesFromRequest();
    //load the mapping files
    $this->loadMappings();
}

private function loadPropertiesFromRequest(){
    if(!empty($_REQUEST['action']))
      $this->action = $_REQUEST['action'];
    if(!empty($_REQUEST['record']))
      $this->record = $_REQUEST['record'];
    if(!empty($_REQUEST['view']))
      $this->view = $_REQUEST['view'];
    if(!empty($_REQUEST['return_module']))
      $this->return_module = $_REQUEST['return_module'];
    if(!empty($_REQUEST['return_action']))
      $this->return_action = $_REQUEST['return_action'];
    if(!empty($_REQUEST['return_id']))
      $this->return_id = $_REQUEST['return_id'];
}

也就是说，action参数首选会从$_REQUEST['action']获取，如果没有设置$_REQUEST['action']则使用SugarController的默认值index。

问：SugarController中如何装入Mapping文件？
答：控制器中有一个loadMapping()函数用来装入Mapping文件。该函数在控制器的setup()函数中被调用：

public function setup($module = ''){
    ......
    //load the mapping files
    $this->loadMappings();
}

private function loadMappings(){
    $this->loadMapping('action_view_map');
    $this->loadMapping('action_file_map');
    $this->loadMapping('action_remap', true);
}

控制器允许会从多个地方寻找Mapping文件：

private function loadMapping($var, $merge = false){
    if ($merge && !empty($this->$var)){
      $$var = $this->$var;
    } else {
      $$var = array();
    }
    if(file_exists('include/MVC/Controller/'. $var . '.php')){
      require('include/MVC/Controller/'. $var . '.php');
    }
    if(file_exists('modules/'.$this->module.'/'. $var . '.php')){
      require('modules/'.$this->module.'/'. $var . '.php');
    }
    if(file_exists('custom/modules/'.$this->module.'/'. $var . '.php')){
      require('custom/modules/'.$this->module.'/'. $var . '.php');
    }
    if(file_exists('custom/include/MVC/Controller/'. $var . '.php')){
      require('custom/include/MVC/Controller/'. $var . '.php');
    }

    // entry_point_registry -> EntryPointRegistry
    $varname = str_replace(" ","",ucwords(str_replace("_"," ", $var)));
    if(file_exists("custom/application/Ext/$varname/$var.ext.php")){
      require("custom/application/Ext/$varname/$var.ext.php");
    }
    if(file_exists("custom/modules/{$this->module}/Ext/$varname/$var.ext.php")){
      require("custom/modules/{$this->module}/Ext/$varname/$var.ext.php");
    }

    $this->$var = $$var;
}

loadMapping()函数在最后会将装入的Mapping映射为控制器的实例变量。

问：控制器中如何实现URL重定向？
答：SugarController中定义了一个实例变量redirect_url：

class SugarController {
    /**
     * url to redirect to
     */
    public $redirect_url = '';
}

在Action方法中设置$redirect_url就可以实现URL重定向。例如：

function action_redirect() {
    $this->redirect_url = 'http://www.baidu.com/';
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这是因为SugarController使用execute()函数处理请求，在该函数末尾有检查$redirect_url是否有设值。若有设值，则调用SugarApplication::redirect()跳转：

final public function execute() {
    try
    {
        $this->process();
        if(!empty($this->view))
        {
            $this->processView();
        }
        elseif(!empty($this->redirect_url))
        {
              $this->redirect();
        }
    }
    catch (Exception $e)
    {
        $this->handleException($e);
    }
}

protected function redirect(){
    if (!empty($this->redirect_url))
        SugarApplication::redirect($this->redirect_url);
}

如果不在控制器中要实现URL重定向，就应该用SugarApplication::redirect()函数。

问：控制器如何自动读取Bean?

答：如果请求参数中有record存在，则SugarController会自动读取后台数据到实例变量$bean中。首先控制器要从$_REQUEST获取record参数到$this->record：

public function setup($module = ''){
    ......
    //set properties on the controller from the $_REQUEST
    $this->loadPropertiesFromRequest();
}

private function loadPropertiesFromRequest(){
    ......
    if(!empty($_REQUEST['record']))
      $this->record = $_REQUEST['record'];
}

然后，控制器在处理请求时通过在process()函数中调用loadBean()实现读取Bean：

public function process(){
    ......
    $this->loadBean();
}

public function loadBean()
{
    if(!empty($GLOBALS['beanList'][$this->module])){
        $class = $GLOBALS['beanList'][$this->module];
        if(!empty($GLOBALS['beanFiles'][$class])){
            require_once($GLOBALS['beanFiles'][$class]);
            $this->bean = new $class();
            if(!empty($this->record)){
                $this->bean->retrieve($this->record);
                if($this->bean)
                    $GLOBALS['FOCUS'] = $this->bean;
            }
        }
    }
}

从loadBean()代码可以发现，要自动装入Bean需要定义$GLOBALS['beanList']和$GLOBALS['beanFiles']。默认的定义在include/modules.php：

// index.php
//    require_once('include/entryPoint.php')
//        require_once('include/modules.php');

$beanList['Leads'] = 'Lead';
$beanFiles['Lead'] = 'modules/Leads/Lead.php';

问：控制器如何处理action_remap？
问：控制器如何处理action_file_map和action_view_map？
问：控制器如何检查用户请求的权限？例如谁人可以执行数据库的备份和恢复处理？