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Refactoring

Browse source 
- object model
- code is smaller, more readable.
- cache implemented
- README updated.
- Bridges added: Twitter, Google Search.
This commit is contained in:
Sebastien SAUVAGE 2013-08-07 22:33:21 +02:00
parent 18fecca175
commit 2797336bbe
6 changed files with 356 additions and 60 deletions
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1
.gitignore vendored
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@ -2,6 +2,7 @@
## Eclipse
#################
simple_html_dom.php
data/
*.pydevproject
.project
.metadata

37
README.md
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@ -7,6 +7,29 @@ Supported sites/pages
===
* `rss-bridge-flickr-explore.php` : [Latest interesting images](http://www.flickr.com/explore) from Flickr.
* `rss-bridge-googlesearch.php` : Most recent results from Google Search. Parameters:
* q=keyword : Keyword search.
* `rss-bridge-twitter.php` : Twitter. Parameters:
* q=keyword : Keyword search.
* u=username : Get user timeline.
Output format
===
Output format can be used in any rss-bridge:
* `format=atom` (default): ATOM Feed.
* `format=json` : jSon
* `format=html` : html page
* `format=plaintext` : raw text (php object, as returned by print_r)
If format is not specified, ATOM format will be used.
Examples
===
* `rss-bridge-twitter.php?u=Dinnerbone` : Get Dinnerbone (Minecraft developer) timeline, in ATOM format.
* `rss-bridge-twitter.php?q=minecraft&format=html` : Everything Minecraft from Twitter, in html format.
* `rss-bridge-flickr-explore.php` : Latest interesting images from Flickr, in ATOM format.
Requirements
===
@ -14,10 +37,22 @@ Requirements
* php 5.3
* [PHP Simple HTML DOM Parser](http://simplehtmldom.sourceforge.net/)
Author
===
I'm sebsauvage, webmaster of [sebsauvage.net](http://sebsauvage.net), author of [Shaarli](http://sebsauvage.net/wiki/doku.php?id=php:shaarli) and [ZeroBin](http://sebsauvage.net/wiki/doku.php?id=php:zerobin).
Thanks to [Mitsukarenai](https://github.com/Mitsukarenai) for the inspiration.
Licence
===
Code is public domain.
Technical notes
===
* There is a cache so that source services won't ban you even if you hammer the rss-bridge with requests. Each bridge has a different duration for the cache. The `cache` subdirectory will be automatically created. You can purge it whenever you want.
* To implement a new rss-bridge, import `rss-bridge-lib.php` and subclass `RssBridgeAbstractClass`. Look at existing bridges for examples. For items you generate in `$this->items`, only `uri` and `title` are mandatory in each item. `timestamp` and `content` are optional but recommended. Any additional key will be ignored by ATOM feed (but outputed to jSon).
Rant
===
@ -29,4 +64,6 @@ You're not social when you hamper sharing by removing RSS. You're happy to have
We want to share with friends, using open protocols: RSS, XMPP, whatever. Because no one wants to have *your* service with *your* applications using *your* API forced-feeded to them. Friends must be free to choose whatever software and service they want.
We are rebuilding bridges your have wilfully destroyed.
Get your shit together: Put RSS back in.

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rss-bridge-flickr-explore.php
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<?php
/* Flickr Explorer RSS bridge.
Returns a feed all new interesting images from http://www.flickr.com/explore
Licence: Public domain.
Returns ATOM feed by default.
Other available formats: ?format=plaintext and ?format=json
require_once('rss-bridge-lib.php');
/**
* RssBridgeFlickrExplore
* Returns the newest interesting images from http://www.flickr.com/explore
*/
ini_set('user_agent', 'Mozilla/5.0 (X11; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0');
date_default_timezone_set('UTC');
//ini_set('display_errors','1');
//error_reporting(E_ALL);
function returnError($code, $message) { header("HTTP/1.1 $code"); header('content-type: text/plain'); die($message); }
if (!file_exists('simple_html_dom.php')) { returnError('404 Not Found', 'ERROR: "PHP Simple HTML DOM Parser" is missing. Get it from http://simplehtmldom.sourceforge.net/ and place the script "simple_html_dom.php" in the same folder to allow me to work.'); }
require_once('simple_html_dom.php');
$html = file_get_html('http://www.flickr.com/explore') or returnError('404 Not Found', 'ERROR: could not request Flickr');
$items = Array();
foreach($html->find('span.photo_container') as $element)
class RssBridgeFlickrExplore extends RssBridgeAbstractClass
{
$item['href'] = 'http://flickr.com'.$element->find('a',0)->href; // Page URI
$item['thumbnailUri'] = $element->find('img',0)->getAttribute('data-defer-src'); // Thumbnail URI
$item['title'] = $element->find('a',0)->title; // Photo title
$items[] = $item;
protected $bridgeName = 'Flickr Explore';
protected $bridgeURI = 'http://www.flickr.com/explore';
protected $bridgeDescription = 'Returns the latest interesting images from Flickr';
protected $cacheDuration = 360; // 6 hours. No need to get more.
protected function collectData($request) {
$html = file_get_html('http://www.flickr.com/explore') or $this->returnError('404 Not Found', 'ERROR: could not request Flickr.');
$this->items = Array();
foreach($html->find('span.photo_container') as $element) {
$item['uri'] = 'http://flickr.com'.$element->find('a',0)->href;
$item['thumbnailUri'] = $element->find('img',0)->getAttribute('data-defer-src');
$item['content'] = '<a href="'.$item['uri'].'"><img src="'.$item['thumbnailUri'].'" /></a>'; // FIXME: Filter javascript ?
$item['title'] = $element->find('a',0)->title;
$this->items[] = $item;
}
}
}
if(empty($items)) { returnError('404 Not Found', 'ERROR: no results.'); }
$format = 'atom';
if (!empty($_GET['format'])) { $format = $_GET['format']; }
switch($format)
{
case 'plaintext':
case 'json':
case 'atom':
break;
default:
$format='atom';
}
if($format == 'plaintext') { header('content-type: text/plain;charset=utf8'); print_r($items); exit; }
if($format == 'json') { header('content-type: application/json'); $items = json_encode($items); exit($items); }
if($format == 'atom')
{
header('content-type: application/atom+xml; charset=UTF-8');
echo '<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom" xmlns:thr="http://purl.org/syndication/thread/1.0" xml:lang="en-US">'."\n";
echo '<title type="text">Flickr Explore</title>'."\n";
echo '<id>http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? 's' : '')."://{$_SERVER['HTTP_HOST']}{$_SERVER['PATH_INFO']}".'/</id>'."\n";
echo '<updated>'.date(DATE_ATOM, $tweets['0']['timestamp']).'</updated>'."\n";
echo '<link rel="alternate" type="text/html" href="http://www.flickr.com/explore" />'."\n";
echo '<link rel="self" href="http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? 's' : '')."://{$_SERVER['HTTP_HOST']}".htmlentities($_SERVER['REQUEST_URI']).'" />'."\n"."\n";
foreach($items as $item) {
echo '<entry><author><name>Flickr</name><uri>http://flickr.com/</uri></author>'."\n";
echo '<title type="html"><![CDATA['.$item['title'].']]></title>'."\n";
echo '<link rel="alternate" type="text/html" href="'.$item['href'].'" />'."\n";
echo '<id>'.$item['href'].'</id>'."\n";
echo '<updated></updated>'."\n"; // FIXME: date ???
echo '<content type="html"><![CDATA[<a href="'.$item['href'].'"><img src="'.$item['thumbnailUri'].'" /></a>]]></content>'."\n";
echo '</entry>'."\n\n";
}
echo '</feed>';
exit;
}
exit();
$bridge = new RssBridgeFlickrExplore();
$bridge->process();
?>

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rss-bridge-googlesearch.php Normal file
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<?php
require_once('rss-bridge-lib.php');
/**
* RssBridgeGoogleMostRecent
* Search Google for most recent pages regarding a specific topic.
* Returns the 100 most recent links in results in past year,
* sorting by date (most recent first).
* Example:
* http://www.google.com/search?q=sebsauvage&num=100&complete=0&tbs=qdr:y,sbd:1
* complete=0&num=100 : get 100 results
* qdr:y : in past year
* sbd:1 : sort by date (will only work if qdr: is specified)
*/
class RssBridgeGoogleSearch extends RssBridgeAbstractClass
{
protected $bridgeName = 'Google search';
protected $bridgeURI = 'http://google.com';
protected $bridgeDescription = 'Returns most recent results from Google search.';
protected $cacheDuration = 30; // 30 minutes, otherwise you could get banned by Google, or stumblr upon their captcha.
protected function collectData($request) {
$html = '';
if (isset($request['q'])) { /* keyword search mode */
$html = file_get_html('http://www.google.com/search?q='.urlencode($request['q']).'&num=100&complete=0&tbs=qdr:y,sbd:1') or $this->returnError('404 Not Found', 'ERROR: no results for this query.');
} else {
$this->returnError('400 Bad Request', 'ERROR: You must specify a keyword (?q=...).');
}
$this->items = Array();
foreach($html->find('div[id=ires]',0)->find('li[class=g]') as $element) {
$item['uri'] = $element->find('a[href]',0)->href;
$item['title'] = $element->find('h3',0)->plaintext;
$item['content'] = $element->find('span[class=st]',0)->plaintext;
$this->items[] = $item;
}
}
}
$bridge = new RssBridgeGoogleSearch();
$bridge->process();
?>

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rss-bridge-lib.php Normal file
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<?php
/* rss-bridge library.
Foundation functions for rss-bridge project.
See https://github.com/sebsauvage/rss-bridge
Licence: Public domain.
*/
ini_set('user_agent', 'Mozilla/5.0 (X11; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0');
date_default_timezone_set('UTC');
error_reporting(0);
//ini_set('display_errors','1'); error_reporting(E_ALL); // For debugging only.
define('CACHEDIR','cache/'); // Directory containing cache files. Do not forget trailing slash.
ob_start();
// Create cache directory if it does not exist.
if (!is_dir(CACHEDIR)) { mkdir(CACHEDIR,0705); chmod(CACHEDIR,0705); }
// Import DOM library.
if (!file_exists('simple_html_dom.php'))
{
header('HTTP/1.1 500 Internal Server Error');
header('Content-Type: text/plain');
die('"PHP Simple HTML DOM Parser" is missing. Get it from http://simplehtmldom.sourceforge.net/ and place the script "simple_html_dom.php" in the same folder to allow me to work.');
}
require_once('simple_html_dom.php');
/**
* Abstract RSSBridge class on which all bridges are build upon.
* It provides utility methods (cache, ATOM feed building...)
*/
abstract class RssBridgeAbstractClass
{
/**
* $items is an array of dictionnaries. Each subclass must fill this array when collectData() is called.
* eg. $items = Array( Array('uri'=>'http://foo.bar', 'title'=>'My beautiful foobar', 'content'='Hello, <b>world !</b>','timestamp'=>'1375864834'),
* Array('uri'=>'http://toto.com', 'title'=>'Welcome to toto', 'content'='What is this website about ?','timestamp'=>'1375868313')
* )
* Keys in dictionnaries:
* uri (string;mandatory) = The URI the item points to.
* title (string;mandatory) = Title of item
* content (string;optionnal) = item content (usually HTML code)
* timestamp (string;optionnal) = item date. Must be in EPOCH format.
* Other keys can be added, but will be ignored.
* $items will be used to build the ATOM feed, json and other outputs.
*/
var $items;
private $contentType; // MIME type returned to browser.
/**
* Sets the content-type returns to browser.
* Example: $this->setContentType('text/html; charset=UTF-8')
*/
private function setContentType($value)
{
$this->contentType = $value;
header('Content-Type: '.$value);
}
/**
* collectData() will be called to ask the bridge to go collect data on the net.
* All derived classes must implement this method.
* This method must fill $this->items with collected items.
* Input: $request : The incoming request (=$_GET). This can be used or ignored by the bridge.
*/
abstract protected function collectData($request);
/**
* Returns a HTTP error to user, with a message.
* Example: $this->returnError('404 Not Found', 'ERROR: no results.');
*/
protected function returnError($code, $message)
{
header("HTTP/1.1 $code"); header('Content-Type: text/plain;charset=UTF-8');
die($message);
}
/**
* Builds an ATOM feed from $this->items and return it to browser.
*/
private function returnATOM()
{
$this->setContentType('application/atom+xml; charset=UTF-8');
echo '<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom" xmlns:thr="http://purl.org/syndication/thread/1.0" xml:lang="en-US">'."\n";
echo '<title type="text">'.htmlspecialchars($this->bridgeName).'</title>'."\n";
echo '<id>http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? 's' : '')."://{$_SERVER['HTTP_HOST']}{$_SERVER['PATH_INFO']}".'/</id>'."\n";
echo '<updated></updated>'."\n"; // FIXME
echo '<link rel="alternate" type="text/html" href="'.htmlspecialchars($this->bridgeURI).'" />'."\n";
echo '<link rel="self" href="http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? 's' : '')."://{$_SERVER['HTTP_HOST']}".htmlentities($_SERVER['REQUEST_URI']).'" />'."\n"."\n";
foreach($this->items as $item) {
echo '<entry><author><name>'.htmlspecialchars($this->bridgeName).'</name><uri>'.htmlspecialchars($this->bridgeURI).'</uri></author>'."\n";
echo '<title type="html"><![CDATA['.$item['title'].']]></title>'."\n";
echo '<link rel="alternate" type="text/html" href="'.$item['uri'].'" />'."\n";
echo '<id>'.$item['uri'].'</id>'."\n";
if (isset($item['timestamp']))
{
echo '<updated>'.date(DATE_ATOM, $item['timestamp']).'</updated>'."\n";
}
else
{
echo '<updated></updated>'."\n";
}
if (isset($item['content']))
{
echo '<content type="html"><![CDATA['.$item['content'].']]></content>'."\n";
}
else
{
echo '<content type="html"></content>'."\n";
}
// FIXME: Security: Disable Javascript ?
echo '</entry>'."\n\n";
}
echo '</feed>';
}
private function returnHTML()
{
$this->setContentType('text/html; charset=UTF-8');
echo '<html><head><title>'.htmlspecialchars($this->bridgeName).'</title>';
echo '<style>body{font-family:"Trebuchet MS",Verdana,Arial,Helvetica,sans-serif;font-size:10pt;background-color:#aaa;}div.rssitem{border:1px solid black;padding:5px;margin:10px;background-color:#fff;}</style></head><body>';
echo '<h1>'.htmlspecialchars($this->bridgeName).'</h1>';
foreach($this->items as $item) {
echo '<div class="rssitem"><h2><a href="'.$item['uri'].'">'.htmlspecialchars(strip_tags($item['title'])).'</a></h2>';
if (isset($item['timestamp'])) { echo '<small>'.date(DATE_ATOM, $item['timestamp']).'</small>'; }
if (isset($item['content'])) { echo '<p>'.$item['content'].'</p>'; }
echo "</div>\n\n";
}
echo '</body></html>';
}
/**
* Builds a JSON string from $this->items and return it to browser.
*/
private function returnJSON()
{
$this->setContentType('application/json');
echo json_encode($this->items);
}
/**
* Returns $this->items as raw php data.
*/
private function returnPlaintext()
{
$this->setContentType('text/plain;charset=UTF-8');
print_r($this->items);
}
/**
* Start processing request and return response to browser.
*/
public function process()
{
$this->serveCachedVersion();
// Cache file does not exists or has expired: We re-fetch the results and cache it.
$this->collectData($_GET);
if (empty($this->items)) { $this->returnError('404 Not Found', 'ERROR: no results.'); }
$format = 'atom';
if (!empty($_GET['format'])) { $format = $_GET['format']; }
switch($format) {
case 'plaintext':
$this->returnPlaintext();
break;
case 'json':
$this->returnJSON();
break;
case 'html':
$this->returnHTML();
break;
default:
$this->returnATOM();
}
$this->storeReponseInCache();
}
/**
* Returns the cached version of current request URI directly to the browser
* if it exists and if cache has not expired.
* Continues execution no cached version available.
*/
private function serveCachedVersion()
{
// See if cache exists for this request
$cachefile = CACHEDIR.hash('sha1',$_SERVER['REQUEST_URI']).'.cache'; // Cache path and filename
if (file_exists($cachefile)) { // The cache file exists.
if (time() - ($this->cacheDuration*60) < filemtime($cachefile)) { // Cache file has not expired. Serve it.
$data = json_decode(file_get_contents($cachefile),true);
header('Content-Type: '.$data['Content-Type']); // Send proper MIME Type
header('X-Cached-Version: '.date(DATE_ATOM, filemtime($cachefile)));
echo $data['data'];
exit();
}
}
}
/**
* Stores currently generated page in cache.
*/
private function storeReponseInCache()
{
$cachefile = CACHEDIR.hash('sha1',$_SERVER['REQUEST_URI']).'.cache'; // Cache path and filename
$data = Array('data'=>ob_get_contents(), 'Content-Type'=>$this->contentType);
file_put_contents($cachefile,json_encode($data));
ob_end_flush();
}
}
?>

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rss-bridge-twitter.php Normal file
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<?php
require_once('rss-bridge-lib.php');
/**
* RssBridgeTwitter
* Based on https://github.com/mitsukarenai/twitterbridge-noapi
*/
class RssBridgeTwitter extends RssBridgeAbstractClass
{
protected $bridgeName = 'Twitter Bridge';
protected $bridgeURI = 'http://twitter.com';
protected $bridgeDescription = 'Returns user timelines or keyword search from http://twitter.com without using their API.';
protected $cacheDuration = 5; // 5 minutes
protected function collectData($request) {
$html = '';
if (isset($request['q'])) { /* keyword search mode */
$html = file_get_html('http://twitter.com/search/realtime?q='.urlencode($request['q']).'+include:retweets&src=typd') or $this->returnError('404 Not Found', 'ERROR: no results for this query.');
} elseif (isset($request['u'])) { /* user timeline mode */
$html = file_get_html('http://twitter.com/'.urlencode($request['u'])) or $this->returnError('404 Not Found', 'ERROR: requested username can\'t be found.');
} else {
$this->returnError('400 Bad Request', 'ERROR: You must specify a keyword (?q=...) or a Twitter username (?u=...).');
}
$this->items = Array();
foreach($html->find('div.tweet') as $tweet) {
$item['username'] = trim(substr($tweet->find('span.username', 0)->plaintext, 1)); // extract username and sanitize
$item['fullname'] = $tweet->getAttribute('data-name'); // extract fullname (pseudonym)
$item['avatar'] = $tweet->find('img', 0)->src; // get avatar link
$item['id'] = $tweet->getAttribute('data-tweet-id'); // get TweetID
$item['uri'] = 'https://twitter.com'.$tweet->find('a.details', 0)->getAttribute('href'); // get tweet link
$item['timestamp'] = $tweet->find('span._timestamp', 0)->getAttribute('data-time'); // extract tweet timestamp
$item['content'] = str_replace('href="/', 'href="https://twitter.com/', strip_tags($tweet->find('p.tweet-text', 0)->innertext, '<a>')); // extract tweet text
$item['title'] = $item['fullname'] . ' (@'.$item['username'] . ') | ' . $item['content'];
$this->items[] = $item;
}
}
}
$bridge = new RssBridgeTwitter();
$bridge->process();
?>