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path: root/providers/Facebook.php
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<?php

namespace Providers;

require_once('HtmlFeed.php');
require_once('Item.php');

class Facebook extends \Providers\HtmlFeed {

    protected $_cacheTimeout = '300 years';

    public function __construct($feed, $options) {
        parent::__construct($feed, $options);
        if (isset($this->_options['dump'])) {
            $this->_options['force'] = TRUE;
        }
        if (isset($this->_options['force'])) {
            $this->_cacheTimeout = '1 second';
        }
    }

    protected function _getCachePath() {
        return '../cache/facebook.%s';
    }

    protected function _getFeedUrl($feed) {
        return sprintf('https://m.facebook.com/%s/posts', $feed);
    }

    protected function _parseFeedContent($tree) {
        $items = [];
        if (isset($this->_options['dump'])) {
            print($tree->html());
        }
        foreach ($tree->find('article') as $header) {
            $data = json_decode($header->attr()['data-store'], TRUE)['linkdata'];
            $data = json_decode(explode('page_insights.', $data)[1], TRUE);
            $data = array_filter(
                $data,
                function($a) { return isset($a['post_context']); }
            );
            $data = array_pop($data);
            $data = $data['post_context'];
            $key = $data['story_fbid'];
            $texts = [];
            foreach ($header->find('p, h3') as $paragraph) {
                $texts[] = utf8_decode($paragraph->text());
            }
            if (isset($this->_options['dump'])) {
                print_r($data);
                print($key);
                print(PHP_EOL);
                print_r($texts);
                print(PHP_EOL);
            }
            if (count($texts)) {
                $items[$key] = [
                    'id' => $key,
                    'time' => $data['publish_time'],
                    'content' => $header->html(),
                    'texts' => $texts
                ];
            }
        }
        if (isset($this->_options['dump'])) {
            die();
        }
        return array_values($items);
    }

    protected function _mapItems($content) {
        return array_map(
            function ($obj) {
                $item = new Item();
                $item->ID = $obj['id'];
                $item->Link = sprintf(
                    'https://facebook.com/%s',
                    $obj['id']
                );
                $item->Title = $obj['texts'][0];
                $item->Text = implode('<br />', $obj['texts']);
                $item->Time = $obj['time'];
                return $item;
            },
            $content
        );
    }

    public function title() {
        return sprintf("%s's Facebook page posts", $this->_feed);
    }

}

?>