Ticket 1870: drop unnecessary Tidy module installation requirement.

Tidy was only being used by a couple of non-default URL shortener plugins,
PtitUrl and TightUrl. Both were easily changed to load the tag-soup HTML
via DOMDocument (using the default DOM module which is already used by
other dependencies).

Added xml, dom, and simplexml modules to the requirements check
in install.php, as they were being used but not checked for.

Also cleaned up LilUrl, PtitUrl, and TightUrl to return URL as a string
instead of as a SimpleXML node object.

README

@@ -98,7 +98,6 @@ released Aug 26 2009. Notable changes this version:
 - Better error handling in Twitter posting.
 - Show oEmbed data for XHTML files as well as plain HTML.
 - Updated bug database link in README.
-- require HTML tidy extension.
 - add support for HTTP Basic Auth in PHP CGI or FastCGI (e.g. GoDaddy).
 - autofocus input to selected entry elements depending on page.
 - updated layout for filter-by-tag form.
@@ -179,7 +178,6 @@ Your PHP installation must include the following PHP extensions:
 - GD. For scaling down avatar images.
 - mbstring. For handling Unicode (UTF-8) encoded strings.
 - gettext. For multiple languages. Default on many PHP installs.
-- tidy. Used to clean up HTML/URLs for the URL shortener to consume.
 
 For some functionality, you will also need the following extensions:
 

install.php

@@ -301,7 +301,7 @@ function checkPrereqs()
     }
 
     $reqs = array('gd', 'curl',
-                  'xmlwriter', 'mbstring','tidy');
+                  'xmlwriter', 'mbstring', 'xml', 'dom', 'simplexml');
 
     foreach ($reqs as $req) {
         if (!checkExtension($req)) {

plugins/LilUrl/LilUrlPlugin.php

@@ -54,7 +54,7 @@ class LilUrlPlugin extends UrlShortenerPlugin
         if (!isset($y->body)) return;
         $x = $y->body->p[0]->a->attributes();
         if (isset($x['href'])) {
-            return $x['href'];
+            return strval($x['href']);
         }
     }
 }

plugins/PtitUrl/PtitUrlPlugin.php

@@ -47,11 +47,14 @@ class PtitUrlPlugin extends UrlShortenerPlugin
     {
         $response = $this->http_get(sprintf($this->serviceUrl,urlencode($url)));
         if (!$response) return;
-        $response = $this->tidy($response);
+        $dom = new DOMDocument();
-        $y = @simplexml_load_string($response);
+        @$dom->loadHTML($response);
+        $y = @simplexml_import_dom($dom);
         if (!isset($y->body)) return;
         $xml = $y->body->center->table->tr->td->pre->a->attributes();
-        if (isset($xml['href'])) return $xml['href'];
+        if (isset($xml['href'])) {
+            return strval($xml['href']);
+        }
     }
 }
 

plugins/TightUrl/TightUrlPlugin.php

@@ -48,10 +48,13 @@ class TightUrlPlugin extends UrlShortenerPlugin
     {
         $response = $this->http_get(sprintf($this->serviceUrl,urlencode($url)));
         if (!$response) return;
-        $response = $this->tidy($response);
+        $dom = new DOMDocument();
-        $y = @simplexml_load_string($response);
+        @$dom->loadHTML($response);
+        $y = @simplexml_import_dom($dom);
         if (!isset($y->body)) return;
         $xml = $y->body->p[0]->code[0]->a->attributes();
-        if (isset($xml['href'])) return $xml['href'];
+        if (isset($xml['href'])) {
+            return strval($xml['href']);
+        }
     }
 }

plugins/UrlShortener/UrlShortenerPlugin.php

@@ -68,14 +68,6 @@ abstract class UrlShortenerPlugin extends Plugin
         return $response->getBody();
     }
 
-    protected function tidy($response) {
-        $response = str_replace(' ', ' ', $response);
-        $config = array('output-xhtml' => true);
-        $tidy = new tidy;
-        $tidy->parseString($response, $config, 'utf8');
-        $tidy->cleanRepair();
-        return (string)$tidy;
-    }
     //------------Below are the methods that connect StatusNet to the implementing Url Shortener plugin------------\\
 
     function onInitializePlugin(){