Add external links for tasks with plugin api

app/ExternalLink/AttachmentLinkProvider.php

@@ -0,0 +1,117 @@
+<?php
+
+namespace Kanboard\ExternalLink;
+
+use Kanboard\Core\ExternalLink\ExternalLinkProviderInterface;
+
+/**
+ * Attachment Link Provider
+ *
+ * @package  externalLink
+ * @author   Frederic Guillot
+ */
+class AttachmentLinkProvider extends BaseLinkProvider implements ExternalLinkProviderInterface
+{
+    /**
+     * File extensions that are not attachments
+     *
+     * @access protected
+     * @var array
+     */
+    protected $extensions = array(
+        'html',
+        'htm',
+        'xhtml',
+        'php',
+        'jsp',
+        'do',
+        'action',
+        'asp',
+        'aspx',
+        'cgi',
+    );
+
+    /**
+     * Get provider name
+     *
+     * @access public
+     * @return string
+     */
+    public function getName()
+    {
+        return t('Attachment');
+    }
+
+    /**
+     * Get link type
+     *
+     * @access public
+     * @return string
+     */
+    public function getType()
+    {
+        return 'attachment';
+    }
+
+    /**
+     * Get a dictionary of supported dependency types by the provider
+     *
+     * @access public
+     * @return array
+     */
+    public function getDependencies()
+    {
+        return array(
+            'related' => t('Related'),
+        );
+    }
+
+    /**
+     * Return true if the provider can parse correctly the user input
+     *
+     * @access public
+     * @return boolean
+     */
+    public function match()
+    {
+        if (preg_match('/^https?:\/\/.*\.([^\/]+)$/', $this->userInput, $matches)) {
+            return $this->isValidExtension($matches[1]);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the link found with the properties
+     *
+     * @access public
+     * @return ExternalLinkInterface
+     */
+    public function getLink()
+    {
+        $link = new AttachmentLink($this->container);
+        $link->setUrl($this->userInput);
+
+        return $link;
+    }
+
+    /**
+     * Check file extension
+     *
+     * @access protected
+     * @param  string $extension
+     * @return boolean
+     */
+    protected function isValidExtension($extension)
+    {
+        $extension = strtolower($extension);
+
+        foreach ($this->extensions as $ext) {
+            if ($extension === $ext) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}