rss-bridge/bridges/NextgovBridge.php

<?php
class NextgovBridge extends BridgeAbstract {

    public function loadMetadatas() {

        $this->maintainer = 'ORelio';
        $this->name = 'Nextgov Bridge';
        $this->uri = 'https://www.nextgov.com/';
        $this->description = 'USA Federal technology news, best practices, and web 2.0 tools.';

        $this->parameters[] = array(
          'category'=>array(
            'name'=>'Category',
            'type'=>'list',
            'values'=>array(
              'All'=>'all',
              'Technology News'=>'technology-news',
              'CIO Briefing'=>'cio-briefing',
              'Emerging Tech'=>'emerging-tech',
              'Cloud'=>'cloud-computing',
              'Cybersecurity'=>'cybersecurity',
              'Mobile'=>'mobile',
              'Health'=>'health',
              'Defense'=>'defense',
              'Big Data'=>'big-data'
            )
          )
        );
    }

    public function collectData(){
        $param=$this->parameters[$this->queriedContext];

        function ExtractFromDelimiters($string, $start, $end) {
            if (strpos($string, $start) !== false) {
                $section_retrieved = substr($string, strpos($string, $start) + strlen($start));
                $section_retrieved = substr($section_retrieved, 0, strpos($section_retrieved, $end));
                return $section_retrieved;
            } return false;
        }

        function StripWithDelimiters($string, $start, $end) {
            while (strpos($string, $start) !== false) {
                $section_to_remove = substr($string, strpos($string, $start));
                $section_to_remove = substr($section_to_remove, 0, strpos($section_to_remove, $end) + strlen($end));
                $string = str_replace($section_to_remove, '', $string);
            } return $string;
        }

        $category = $param['category']['value'];
        if (empty($category))
            $category = 'all';
        if ($category !== preg_replace('/[^a-z-]+/', '', $category) || strlen($category > 32))
            $this->returnClientError('Invalid "category" parameter.');
        $url = $this->getURI().'rss/'.$category.'/';
        $html = $this->getSimpleHTMLDOM($url) or $this->returnServerError('Could not request Nextgov: '.$url);
        $limit = 0;

        foreach ($html->find('item') as $element) {
            if ($limit < 10) {

                $article_url = ExtractFromDelimiters($element->innertext, '<link>', '</link>');
                $article_author = ExtractFromDelimiters($element->innertext, 'dc/elements/1.1/">', '</dc:creator>');
                $article_title = $element->find('title', 0)->plaintext;
                $article_subtitle = $element->find('description', 0)->plaintext;
                $article_timestamp = strtotime($element->find('pubDate', 0)->plaintext);
                $article_thumbnail = ExtractFromDelimiters($element->innertext, '<media:content url="', '"');
                $article = $this->getSimpleHTMLDOM($article_url) or $this->returnServerError('Could not request Nextgov: '.$article_url);

                $contents = $article->find('div.wysiwyg', 0)->innertext;
                $contents = StripWithDelimiters($contents, '<div class="ad-container">', '</div>');
                $contents = StripWithDelimiters($contents, '<div', '</div>'); //ad outer div
                $contents = StripWithDelimiters($contents, '<script', '</script>');
                $contents = ($article_thumbnail == '' ? '' : '<p><img src="'.$article_thumbnail.'" /></p>')
                    .'<p><b>'.$article_subtitle.'</b></p>'
                    .trim($contents);

                $item = array();
                $item['uri'] = $article_url;
                $item['title'] = $article_title;
                $item['author'] = $article_author;
                $item['timestamp'] = $article_timestamp;
                $item['content'] = $contents;
                $this->items[] = $item;
                $limit++;
            }
        }

    }
}