Rss-Bridge/bridges/WikipediaBridge.php

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<?php
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define('WIKIPEDIA_SUBJECT_TFA', 0); // Today's featured article
define('WIKIPEDIA_SUBJECT_DYK', 1); // Did you know...
class WikipediaBridge extends BridgeAbstract{
public function loadMetadatas(){
$this->maintainer = 'logmanoriginal';
$this->name = 'Wikipedia bridge for many languages';
$this->uri = 'https://www.wikipedia.org/';
$this->description = 'Returns articles for a language of your choice';
$this->parameters[] = array(
'language'=>array(
'name'=>'Language',
'type'=>'list',
'required'=>true,
'title'=>'Select your language',
'exampleValue'=>'English',
'values'=>array(
'English'=>'en',
'Dutch'=>'nl',
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'Esperanto'=>'eo',
'French'=>'fr',
'German'=>'de',
)
),
'subject'=>array(
'name'=>'Subject',
'type'=>'list',
'required'=>true,
'title'=>'What subject are you interested in?',
'exampleValue'=>'Today\'s featured article',
'values'=>array(
'Today\'s featured article'=>'tfa',
'Did you know…'=>'dyk'
)
),
'fullarticle'=>array(
'name'=>'Load full article',
'type'=>'checkbox',
'title'=>'Activate to always load the full article'
)
);
}
public function collectData(){
$params=$this->parameters[$this->queriedContext];
if(!isset($params['language']['value']))
$this->returnClientError('You must specify a valid language via \'&language=\'!');
if(!$this->CheckLanguageCode(strtolower($params['language']['value'])))
$this->returnClientError('The language code you provided (\'' . $params['language']['value'] . '\') is not supported!');
if(!isset($params['subject']['value']))
$this->returnClientError('You must specify a valid subject via \'&subject=\'!');
$subject = WIKIPEDIA_SUBJECT_TFA;
switch($params['subject']['value']){
case 'tfa':
$subject = WIKIPEDIA_SUBJECT_TFA;
break;
case 'dyk':
$subject = WIKIPEDIA_SUBJECT_DYK;
break;
default:
$subject = WIKIPEDIA_SUBJECT_TFA;
break;
}
$fullArticle = false;
if(isset($params['fullarticle']['value']))
$fullArticle = $params['fullarticle']['value'];
// We store the correct URI as URI of this bridge (so it can be used later!)
$this->uri = 'https://' . strtolower($params['language']['value']) . '.wikipedia.org';
// While we at it let's also update the name for the feed
switch($subject){
case WIKIPEDIA_SUBJECT_TFA:
$this->name = 'Today\'s featured article from ' . strtolower($params['language']['value']) . '.wikipedia.org';
break;
case WIKIPEDIA_SUBJECT_DYK:
$this->name = 'Did you know? - articles from ' . strtolower($params['language']['value']) . '.wikipedia.org';
break;
default:
$this->name = 'Articles from ' . strtolower($params['language']['value']) . '.wikipedia.org';
break;
}
// This will automatically send us to the correct main page in any language (try it!)
$html = $this->getSimpleHTMLDOM($this->uri . '/wiki');
if(!$html)
$this->returnServerError('Could not load site: ' . $this->uri . '!');
/*
* Now read content depending on the language (make sure to create one function per language!)
* We build the function name automatically, just make sure you create a private function ending
* with your desired language code, where the language code is upper case! (en -> GetContentsEN).
*/
$function = 'GetContents' . strtoupper($params['language']['value']);
if(!method_exists($this, $function))
$this->returnServerError('A function to get the contents for your language is missing (\'' . $function . '\')!');
/*
* The method takes care of creating all items.
*/
$this->$function($html, $subject, $fullArticle);
}
/**
* Returns true if the language code is part of the parameters list
*/
private function CheckLanguageCode($languageCode){
$languages = $this->parameters[0]['language']['values'];
$language_names = array();
foreach($languages as $name=>$value)
$language_names[] = $value;
return in_array($languageCode, $language_names);
}
/**
* Replaces all relative URIs with absolute ones
* @param $element A simplehtmldom element
* @return The $element->innertext with all URIs replaced
*/
private function ReplaceURIInHTMLElement($element){
return str_replace('href="/', 'href="' . $this->uri . '/', $element->innertext);
}
/*
* Adds a new item to $items using a generic operation (should work for most (all?) wikis)
* $anchorText can be specified if the wiki in question doesn't use '...' (like Dutch, French and Italian)
* $anchorFallbackIndex can be used to specify a different fallback link than the first (e.g., -1 for the last)
*/
private function AddTodaysFeaturedArticleGeneric($element, $fullArticle, $anchorText = '...', $anchorFallbackIndex = 0){
// Clean the bottom of the featured article
if ($element->find('div', -1))
$element->find('div', -1)->outertext = '';
// The title and URI of the article can be found in an anchor containing the string '...' in most wikis ('full article ...')
$target = $element->find('p/a', $anchorFallbackIndex);
foreach($element->find('//a') as $anchor){
if(strpos($anchor->innertext, $anchorText) !== false){
$target = $anchor;
break;
}
}
$item = array();
$item['uri'] = $this->uri . $target->href;
$item['title'] = $target->title;
if(!$fullArticle)
$item['content'] = strip_tags($this->ReplaceURIInHTMLElement($element), '<a><p><br><img>');
else
$item['content'] = $this->LoadFullArticle($item['uri']);
$this->items[] = $item;
}
/*
* Adds a new item to $items using a generic operation (should work for most (all?) wikis)
*/
private function AddDidYouKnowGeneric($element, $fullArticle){
foreach($element->find('ul', 0)->find('li') as $entry){
$item = array();
// We can only use the first anchor, there is no way of finding the 'correct' one if there are multiple
$item['uri'] = $this->uri . $entry->find('a', 0)->href;
$item['title'] = strip_tags($entry->innertext);
if(!$fullArticle)
$item['content'] = $this->ReplaceURIInHTMLElement($entry);
else
$item['content'] = $this->LoadFullArticle($item['uri']);
$this->items[] = $item;
}
}
/**
* Loads the full article from a given URI
*/
private function LoadFullArticle($uri){
$content_html = $this->getSimpleHTMLDOM($uri);
if(!$content_html)
$this->returnServerError('Could not load site: ' . $uri . '!');
$content = $content_html->find('#mw-content-text', 0);
if(!$content)
$this->returnServerError('Could not find content in page: ' . $uri . '!');
// Let's remove a couple of things from the article
$table = $content->find('#toc', 0); // Table of contents
if(!$table === false)
$table->outertext = '';
foreach($content->find('ol.references') as $reference) // References
$reference->outertext = '';
return str_replace('href="/', 'href="' . $this->uri . '/', $content->innertext);
}
/**
* Implementation for de.wikipedia.org
*/
private function GetContentsDE($html, $subject, $fullArticle){
switch($subject){
case WIKIPEDIA_SUBJECT_TFA:
$element = $html->find('div[id=mf-tfa]', 0);
$this->AddTodaysFeaturedArticleGeneric($element, $fullArticle);
break;
case WIKIPEDIA_SUBJECT_DYK:
$element = $html->find('div[id=mf-dyk]', 0);
$this->AddDidYouKnowGeneric($element, $fullArticle);
break;
default:
break;
}
}
/**
* Implementation for fr.wikipedia.org
*/
private function GetContentsFR($html, $subject, $fullArticle){
switch($subject){
case WIKIPEDIA_SUBJECT_TFA:
$element = $html->find('div[id=accueil-lumieresur]', 0);
$this->AddTodaysFeaturedArticleGeneric($element, $fullArticle, 'Lire la suite');
break;
case WIKIPEDIA_SUBJECT_DYK:
$element = $html->find('div[id=SaviezVous]', 0);
$this->AddDidYouKnowGeneric($element, $fullArticle);
break;
default:
break;
}
}
/**
* Implementation for en.wikipedia.org
*/
private function GetContentsEN($html, $subject, $fullArticle){
switch($subject){
case WIKIPEDIA_SUBJECT_TFA:
$element = $html->find('div[id=mp-tfa]', 0);
$this->AddTodaysFeaturedArticleGeneric($element, $fullArticle);
break;
case WIKIPEDIA_SUBJECT_DYK:
$element = $html->find('div[id=mp-dyk]', 0);
$this->AddDidYouKnowGeneric($element, $fullArticle);
break;
default:
break;
}
}
/**
* Implementation for eo.wikipedia.org
*/
private function GetContentsEO($html, $subject, $fullArticle){
switch($subject){
case WIKIPEDIA_SUBJECT_TFA:
$element = $html->find('div[id=mf-artikolo-de-la-semajno]', 0);
$this->AddTodaysFeaturedArticleGeneric($element, $fullArticle);
break;
case WIKIPEDIA_SUBJECT_DYK:
$element = $html->find('div[id=mw-content-text]', 0)->find('table', 4)->find('td', 4);
$this->AddDidYouKnowGeneric($element, $fullArticle);
break;
default:
break;
}
}
/**
* Implementation for nl.wikipedia.org
*/
private function GetContentsNL($html, $subject, $fullArticle){
switch($subject){
case WIKIPEDIA_SUBJECT_TFA:
$element = $html->find('div[id=mf-uitgelicht]', 0);
$this->AddTodaysFeaturedArticleGeneric($element, $fullArticle, 'Lees meer');
break;
case WIKIPEDIA_SUBJECT_DYK:
$element = $html->find('div[id=mw-content-text]', 0)->find('table', 4)->find('td', 2);
$this->AddDidYouKnowGeneric($element, $fullArticle);
break;
default:
break;
}
}
}