refactor shortenviayourls.php for our MVC framework

lib/Controller.php

@@ -136,6 +136,9 @@ class Controller
             case 'jsonld':
                 $this->_jsonld($this->_request->getParam('jsonld'));
                 return;
+            case 'yourlsproxy':
+                $this->_yourlsproxy($this->_request->getParam('link'));
+                break;
         }
 
         // output JSON or HTML
@@ -378,9 +381,15 @@ class Controller
         );
 
         $page = new View;
+        $page->assign('CSPHEADER', $metacspheader);
+        $page->assign('ERROR', I18n::_($this->_error));
+        if ($this->_request->getOperation() === 'yourlsproxy') {
+            $page->assign('SHORTURL', $this->_status);
+            $page->draw('yourlsproxy');
+            return;
+        }
         $page->assign('NAME', $this->_conf->getKey('name'));
         $page->assign('BASEPATH', I18n::_($this->_conf->getKey('basepath')));
-        $page->assign('ERROR', I18n::_($this->_error));
         $page->assign('STATUS', I18n::_($this->_status));
         $page->assign('VERSION', self::VERSION);
         $page->assign('DISCUSSION', $this->_conf->getKey('discussion'));
@@ -405,7 +414,6 @@ class Controller
         $page->assign('HTTPWARNING', $this->_conf->getKey('httpwarning'));
         $page->assign('HTTPSLINK', 'https://' . $this->_request->getHost() . $this->_request->getRequestUri());
         $page->assign('COMPRESSION', $this->_conf->getKey('compression'));
-        $page->assign('CSPHEADER', $metacspheader);
         $page->draw($this->_conf->getKey('template'));
     }
 
@@ -439,6 +447,22 @@ class Controller
         echo $content;
     }
 
+    /**
+     * proxies link to YOURLS, updates status or error with response
+     *
+     * @access private
+     * @param string $link
+     */
+    private function _yourlsproxy($link)
+    {
+        $yourls = new YourlsProxy($this->_conf, $link);
+        if ($yourls->isError()) {
+            $this->_error = $yourls->getError();
+        } else {
+            $this->_status = $yourls->getUrl();
+        }
+    }
+
     /**
      * prepares JSON encoded status message
      *

lib/Request.php

@@ -120,6 +120,7 @@ class Request
         if (
             !array_key_exists('pasteid', $this->_params) &&
             !array_key_exists('jsonld', $this->_params) &&
+            !array_key_exists('link', $this->_params) &&
             array_key_exists('QUERY_STRING', $_SERVER) &&
             !empty($_SERVER['QUERY_STRING'])
         ) {
@@ -135,6 +136,11 @@ class Request
             }
         } elseif (array_key_exists('jsonld', $this->_params) && !empty($this->_params['jsonld'])) {
             $this->_operation = 'jsonld';
+        } elseif (array_key_exists('link', $this->_params) && !empty($this->_params['link'])) {
+            $request_url = filter_var($_SERVER['REQUEST_URI'], FILTER_SANITIZE_URL);
+            if (strpos($request_url, '/shortenviayourls?link=') !== false) {
+                $this->_operation = 'yourlsproxy';
+            }
         }
     }
 

lib/YourlsProxy.php

@@ -0,0 +1,120 @@
+<?php
+/**
+ * PrivateBin
+ *
+ * a zero-knowledge paste bin
+ *
+ * @link      https://github.com/PrivateBin/PrivateBin
+ * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
+ * @license   https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
+ * @version   1.4.0
+ */
+
+namespace PrivateBin;
+
+use PrivateBin\Configuration;
+
+/**
+ * YourlsProxy
+ *
+ * Forwards a URL for shortening to YOURLS (your own URL shortener) and stores
+ * the result.
+ */
+class YourlsProxy
+{
+    /**
+     * error message
+     *
+     * @access private
+     * @var    string
+     */
+    private $_error = '';
+
+    /**
+     * shortened URL
+     *
+     * @access private
+     * @var    string
+     */
+    private $_url = '';
+
+    /**
+     * constructor
+     *
+     * initializes and runs PrivateBin
+     *
+     * @access public
+     * @param string $link
+     */
+    public function __construct(Configuration $conf, $link)
+    {
+        if (strpos($link, $conf->getKey('basepath') . '/?') !== false) {
+            // Init the CURL session
+            $ch = curl_init();
+            curl_setopt($ch, CURLOPT_URL, $conf->getKey("apiurl", "yourls"));
+            curl_setopt($ch, CURLOPT_HEADER, 0);            // No header in the result
+            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return, do not echo result
+            curl_setopt($ch, CURLOPT_POST, 1);              // This is a POST request
+            curl_setopt($ch, CURLOPT_POSTFIELDS, array(     // Data to POST
+                                'signature' => $conf->getKey("signature", "yourls"),
+                                'format'   => 'json',
+                                'action'   => 'shorturl',
+                                'url' =>  $link
+            ));
+            // Fetch and return content
+            $data = curl_exec($ch);
+            curl_close($ch);
+
+            if (!($data === FALSE) && is_string($data))
+            {
+                $data = json_decode( $data, true);
+
+                if (!is_null($data) && array_key_exists('statusCode', $data)
+                        && array_key_exists('shorturl', $data) &&  ($data['statusCode'] == 200))
+                {
+                    $this->_url = $data['shorturl'];
+                    $opSuccess = TRUE;
+                } else {
+                    $this->_error = 'Error parsing YOURLS response.';
+                }
+            } else {
+                $this->_error = 'Error calling YOURLS. Probably a configuration issue, like wrong or missing "apiurl" or "signature".';
+            }
+        } else {
+            $this->_error = 'Trying to shorten a URL not pointing to our PrivateBin instance.';
+        }
+    }
+
+    /**
+     * Returns the (untranslated) error message
+     *
+     * @access public
+     * @return string
+     */
+    public function getError()
+    {
+        return $this->_error;
+    }
+
+    /**
+     * Returns the shortened URL
+     *
+     * @access public
+     * @return string
+     */
+    public function getUrl()
+    {
+        return $this->_url;
+    }
+
+    /**
+     * Returns true if any error has occurred
+     *
+     * @access public
+     * @return bool
+     */
+    public function isError()
+    {
+        return !empty($this->_error);
+    }
+}