README

This bundle brings an extendable syndication framework to contao. Syndication can be easily added to your own bundle/module/element. There are already some bundles/entites supported out-of-the-box (see features section).

Features

• out-of-the-box syndication support for
  • article
  • content element
  • Reader Bundle
• bundled syndication types:
  • sharing: facebook, email, email feedback, twitter, whatsapp, xing, linkedin
  • export: ical, print
• expandable and customizable syndication framework
  • add pdf export through PDF Creator Bundle
• generated links and link lists implementing PSR-13 LinkInterface and LinkProviderInterface

Usage

Requirements

• php ^7.2
• contao ^4.4
• for iCal (.ics) export: eluceo/ical (^0.16)
• for PDF export: heimrichhannot/contao-pdf-creator-bundle

Install

1. Install with composer or contao manager

   composer require heimrichhannot/contao-syndication-type-bundle
   

2. Update database

Article syndication

You can replace the contao article syndication with the syndication of this bundle.

1. Set huh_syndication_type.enable_article_syndication to true (in your project config.yml)
2. Clear your cache and update the database
3. You'll find the new syndication config in your article configuration

Content element syndication

You can add syndication as a content Element to every article.

1. Set huh_syndication_type.enable_content_syndication to true (in your project config.yml)
2. Clear your cache and update the database
3. You'll find the new syndication type in content element type selection

Reader Bundle

1. Create a new reader config element of type syndication
2. Select syndications
3. output the template variable in your template (with raw filter)

Print content

To print your content, you have two options: print the whole page (a simple window.print() link) or use a custom template to print. Print template are written in twig and the file name must start with syndication_type_print_, for example syndication_type_print_default.html.twig. You can extend our default template or create a complete custom template.

While creating you print template, you may want to see a preview without the print popup. To get one, just append synPrintDebug parameter to the print url.

Developers

Customize link rendering

If you need more control over the output of the link rendering, you have different options:

Override or change default templates

You can override following templates (just use the contao template inheritance with twig templates thanks to Twig Support Bundle):

• syndication_provider_default.html.twig
• syndication_link_default.html.twig

It is also possible to create custom versions like syndication_provider_acme.html.twig. To use a custom link template, you can use the BeforeRenderSyndicationLinks event, pass the option on SyndicationLinkRenderer methods call or decorate the SyndicationLinkRenderer service. Change the provider template can be archived by pass the option on SyndicationLinkRenderer methods call or decorate the SyndicationLinkRenderer service.

Use the BeforeRenderSyndicationLinks event

You can customize the options and the links that are rendered through the BeforeRenderSyndicationLinks.

Example (Contao 4.9+):

namespace Acme\ExampleBundle\EventListener;

use HeimrichHannot\SyndicationTypeBundle\Event\BeforeRenderSyndicationLinksEvent;
use Terminal42\ServiceAnnotationBundle\Annotation\ServiceTag;

/**
 * @ServiceTag("kernel.event_listener", event="HeimrichHannot\SyndicationTypeBundle\Event\BeforeRenderSyndicationLinksEvent")
 */
class SyndicationBeforeRenderSyndicationLinksEventListener
{
    public function __invoke(BeforeRenderSyndicationLinksEvent $event): void
    {
        $options = $event->getLinkRenderOptions();
        $options['template'] = 'syndication_link_acme';
        $event->setLinkRenderOptions($options);
    }
}

Decorate the SyndicationLinkRenderer service

You can customize all options by decorating the SyndicationLinkRenderer service. If you're not familiar with that, it sounds complicated, but symfony make it easy and here is a working example (just change namespaces and class names):

# services.yml
services:
  App\Syndication\DecoratedLinkRenderer:
    decorates: HeimrichHannot\SyndicationTypeBundle\SyndicationLink\SyndicationLinkRenderer
    arguments: ['@App\Syndication\DecoratedLinkRenderer.inner']

use HeimrichHannot\SyndicationTypeBundle\SyndicationLink\SyndicationLinkRenderer;

class DecoratedLinkRenderer extends SyndicationLinkRenderer
{
    protected SyndicationLinkRenderer $inner;

    public function __construct(SyndicationLinkRenderer $inner)
    {
        $this->inner = $inner;
    }

    public function renderProvider(SyndicationLinkProvider $provider, array $options = []): string
    {
        // Tell the renderProvider method to call the customized render method
        return $this->inner->renderProvider($provider, array_merge($options, [
            'render_callback' => [$this, 'render']
        ]));
    }

    public function render(SyndicationLink $link, array $options = []): string
    {
        // add or customize link attributes
        $options['attributes']['class'] = trim(($options['attributes']['class']  ?? '').' btn btn-primary');
        // don't output template dev comments
        $options['disable_dev_comments'] = true;
        // a custom template (pass only the name)
        $options['template'] = 'a_really_custom_link_template';
        // override the link content
        $options['content'] = "Click THIS link!";
       
        return $this->inner->render($link, $options);
    }
}

Add syndications to your bundle

Syndication bundle is build to be reused. You can easily add it to your code.

1. Add all needed fields to your dca

   • We recommend creating a listener to the loadDataContainer Hook
   • Add fields and configuration with SyndicationTypeDcaProvider::prepareDca($table)
   • Generate the palette with SyndicationTypeDcaProvider::getPalette() and place it where it should be. You can pass a boolean parameter to get the palette seperated by legends or not.

   use HeimrichHannot\SyndicationTypeBundle\Dca\SyndicationTypeDcaProvider;
   
   function prepareTable(string $table, SyndicationTypeDcaProvider $syndicationTypeDcaProvider)
     {
         $dca = &$GLOBALS['TL_DCA']['tl_article'];
         $dca['palettes']['default'] = str_replace(
           'printable', 
           $syndicationTypeDcaProvider->getPalette(false), 
           $dca['palettes']['default']
         );
         $syndicationTypeDcaProvider->prepareDca($table);
     }

2. Generate syndication links in your controller/module/listener/...

   • create an instance of SyndicationContext
   • generate syndication links with SyndicationLinkProviderGenerator::generateFromContext() (will return a SyndicationLinkProvider instance, which is a collection of SyndicationLink instances)
   • render the syndication links with SyndicationLinkRenderer::renderProvider() (will return the rendered links as string. You could also use/create a custom link renderer)

   For easy of implementation you can access all of these services through SyndicationManager.

   use HeimrichHannot\SyndicationTypeBundle\Manager\SyndicationManager;
   
   class ExampleController {
   
       private SyndicationManager               $syndicationManager;
   
       public function addSyndication(string $title, string $content, array $itemData, ExampleModel $config): string
       {
           // $title: A title for the syndication
           // $content: What should be shared. Can be a teaser text or a rendered template.
           // $itemData: The data of the entity to share
           // $config: The configuration. Typical the model data (row) of the configuration. Maybe the same as item data.
           $context = $this->syndicationManager->createContext($title, $content, $itemData, $config->row());
           
           // See next paragraph
           $this->doExport($context);
           
           $provider = $this->syndicationManager->getLinkProviderGenerator()->generateFromContext($context);
           $rendererContext = $this->syndicationManager->createLinkRendererContextFromModel();
           
           return $this->syndicationManager->getLinkRenderer()->renderProvider($provider, $rendererContext);
       }
   
   }

3. Add export support.

   • this should be done, where your content to export is completely configured and fully rendered (or can be fully rendered). In the most cases, this can be done where you generate the syndication links, but maybe it must be done on a later point.
   • create a SyndicationContext instance

• run ExportSyndicationHandler::exportByContext()

  use HeimrichHannot\SyndicationTypeBundle\Manager\SyndicationManager;
  use HeimrichHannot\SyndicationTypeBundle\SyndicationContext\SyndicationContext;
      
  class ExampleController {
  
      private SyndicationManager               $syndicationManager;
      
      private function doExport(SyndicationContext $syndicationContext): void
      {
          $this->syndicationManager->getExportSyndicationHandler()->exportByContext($context);
      }
      
  }

Add custom syndication type

1. Create a SyndicationType class
   • the class must implement SyndicationTypeInterface (or ExportSyndicationTypeInterface)
   • you can (and we recommend) extend AbstractSyndicationType or AbstractExportSyndicationType (for syndication types which do some export like pdf, print or ical), which already implement their corresponding interfaces
2. Implement the abstract methods
   • getType() - return an alias for the syndication type
   • generate() - generate the syndication link. A SyndicationContext instance is passed, a SyndicationLink instance must be returned. We recommend to use SyndicationLinkFactory to create the SyndicationLink instance.
3. Optional: If your SyndicationType extends one of the abstract classes, your can override following methods:
   • getCategory() - customize the syndication category. There are two categories predefined as constants in AbstractSyndicationType: share and export, but it is possible to use a custom category
   • getPalette() - if your syndication type depends on additions configuration, you can set the syndication type palette here
4. Optional: If your SyndicationType extends one of the abstract classes, your can use the following helper methods:
   • getValueByFieldOption() - return a configuration value from the context (shorthand so you don't have to do all the array validation)
   • appendGetParameterToUrl() - utils to append a get parameter to an url. Useful for creating export links
5. Register service type class as service with huh.syndication_type.type service tag
6. Create an Event Subscriber for AddSyndicationTypeFieldsEvent,AddSyndicationTypePaletteSelectorsEvent and AddSyndicationTypeSubpalettesEvent to add custom dca fields and subpalettes

Configuration reference

# Default configuration for extension with alias: "huh_syndication_type"
huh_syndication_type:

    # Enable this option to replace the default contao article syndication with syndication type bundle article syndication.
    enable_article_syndication: false
    enable_content_syndication: false