Symfony 2 根据用户代理属性加载不同的模板

问题描述

是否有可能(以及如何)

Is it possible (and how) to

• 确定用户是否使用移动设备
  
• 在这种情况下强制 symfony 2 加载不同的模板
  
• (并回退默认的 html 模板)
  

id 喜欢做的是，在不修改任何控制器的情况下加载不同的模板.

What id like to do is, to load different templates without modifying any controller.

更新

这里的真正问题不是检测部分，它实际上与 symfony 无关.可以在控制器级别完成(加载不同的模板):

It wasn't the detection part the real issue here, it's really nothing to do with symfony. It can be done (load different template) on a controller level:

public function indexAction()
{
    $format = $this->isMobile() ? 'mob' : 'html';
    return $this->render('AcmeBlogBundle:Blog:index.'.$format.'.twig');
}

但是它可以在全球范围内完成吗?就像一个服务，或者在每个请求之前执行的东西，并在模板规则中进行更改.

But can it be done globally? Like a service, or something that execute before every request, and make changes in the templating rules.

推荐答案

好的，所以我没有一个完整的解决方案，但比在哪里寻找一个多一点:)

Ok, so I don't have a full solution but a little more than where to look for one :)

您可以在 app/config/config.yml 中为模板项指定加载器(服务)

You can specify loaders (services) for templating item in app/config/config.yml

framework:
    esi:             { enabled: true }
    #translator:     { fallback: %locale% }
    secret:          %secret%
    router:
        resource: "%kernel.root_dir%/config/routing.yml"
        strict_requirements: %kernel.debug%
    form:            true
    csrf_protection: true
    validation:      { enable_annotations: true }
    templating:
        engines:
           - twig
        loaders:  [moby.loader]
    default_locale:  %locale%
    trust_proxy_headers: false
    session:         ~

然后定义提到的加载器服务:

Then define the mentioned loader service:

services:
    moby.loader:
        class: AcmeAppBundleTwigLoaderMobyFilesystemLoader
        arguments:    ["@templating.locator", "@service_container"]

然后定义你的加载器服务类:

After that define your loader service class:

namespace AcmeAppBundleTwigLoader;

use SymfonyBundleFrameworkBundleTemplatingLoaderFilesystemLoader;
use SymfonyComponentTemplatingStorageFileStorage;


class MobyFilesystemLoader extends FilesystemLoader
{
     protected $container;

     public function __construct($templatePathPatterns, $container)
     {
         parent::__construct($templatePathPatterns);
         $this->container = $container;
     }

     public function load(SymfonyComponentTemplatingTemplateReferenceInterface $template)
     {
         // Here you can filter what you actually want to change from html
         // to mob format
         // ->get('controller') returns the name of a controller
         // ->get('name')  returns the name of the template
         if($template->get('bundle') == 'AcmeAppBundle')
         {
            $request = $this->container->get('request');
            $format = $this->isMobile($request) ? 'mob' : 'html';

            $template->set('format', $format);
         }

         try {
            $file = $this->locator->locate($template);
         } catch (InvalidArgumentException $e) {
            return false;
         }

         return new FileStorage($file);
      }

      /**
       * Implement your check to see if request is made from mobile platform
       */
       private function isMobile($request)
       {
           return true;
       }
 }

正如您所看到的，这不是完整的解决方案，但我希望这至少可以为您指明正确的方向.

As you can see this isn't the full solution, but I hope that this, at least, points you to the right direction.

刚刚发现有一个具有移动检测功能的捆绑包，带有自定义树枝引擎，可根据发送请求的设备呈现模板文件ZenstruckMobileBundle，虽然我从来没有用过它... :)

Just found out that there is a bundle with mobile detection capabilities, with custom twig engine that renders template file depending on a device that sent requestZenstruckMobileBundle, although I never used it so... :)

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