Add ExternalTaskManager class

app/Core/ExternalTask/AccessForbiddenException.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Kanboard\Core\ExternalTask;
+
+use Exception;
+
+/**
+ * Class AccessForbiddenException
+ *
+ * @package Kanboard\Core\ExternalTask
+ */
+class AccessForbiddenException extends Exception
+{
+}

app/Core/ExternalTask/ExternalTaskManager.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Kanboard\Core\ExternalTask;
+
+/**
+ * Class ExternalTaskManager
+ *
+ * @package Kanboard\Core\ExternalTask
+ * @author  Frederic Guillot
+ */
+class ExternalTaskManager
+{
+    protected $providers = array();
+
+    /**
+     * Register a new task provider
+     *
+     * @param ExternalTaskProviderInterface $externalTaskProvider
+     * @return $this
+     */
+    public function register(ExternalTaskProviderInterface $externalTaskProvider)
+    {
+        $this->providers[$externalTaskProvider->getName()] = $externalTaskProvider;
+        return $this;
+    }
+
+    /**
+     * Get task provider
+     *
+     * @param  string $name
+     * @return ExternalTaskProviderInterface|null
+     * @throws ProviderNotFoundException
+     */
+    public function getProvider($name)
+    {
+        if (isset($this->providers[$name])) {
+            return $this->providers[$name];
+        }
+
+        throw new ProviderNotFoundException('Unable to load this provider: '.$name);
+    }
+
+    /**
+     * Get list of task providers
+     *
+     * @return array
+     */
+    public function getProvidersList()
+    {
+        $providers = array_keys($this->providers);
+        return array_combine($providers, $providers);
+    }
+}

app/Core/ExternalTask/ExternalTaskProviderInterface.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Kanboard\Core\ExternalTask;
+
+/**
+ * Interface ExternalTaskProviderInterface
+ *
+ * @package Kanboard\Core\ExternalTask
+ * @author  Frederic Guillot
+ */
+interface ExternalTaskProviderInterface
+{
+    /**
+     * Get templates
+     *
+     * @return string
+     */
+    public function getCreationFormTemplate();
+    public function getModificationFormTemplate();
+    public function getTaskViewTemplate();
+
+    /**
+     * Get provider name (visible in the user interface)
+     *
+     * @access public
+     * @return string
+     */
+    public function getName();
+
+    /**
+     * Retrieve task from external system or cache
+     *
+     * @access public
+     * @throws \Kanboard\Core\ExternalTask\AccessForbiddenException
+     * @throws \Kanboard\Core\ExternalTask\NotFoundException
+     * @param  string $uri
+     * @return array       Dict that will populate the form
+     */
+    public function retrieve($uri);
+
+    /**
+     * Save the task to the external system and/or update the cache
+     *
+     * @access public
+     * @param  string  $uri
+     * @param  array   $data
+     * @return bool
+     */
+    public function persist($uri, array $data);
+}

app/Core/ExternalTask/NotFoundException.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Kanboard\Core\ExternalTask;
+
+use Exception;
+
+/**
+ * Class NotFoundException
+ *
+ * @package Kanboard\Core\ExternalTask
+ * @author  Frederic Guillot
+ */
+class NotFoundException extends Exception
+{
+}

app/Core/ExternalTask/ProviderNotFoundException.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Kanboard\Core\ExternalTask;
+
+use Exception;
+
+/**
+ * Class ProviderNotFoundException
+ *
+ * @package Kanboard\Core\ExternalTask
+ * @author  Frederic Guillot
+ */
+class ProviderNotFoundException extends Exception
+{
+}