Added new API calls for project attachements

app/Api/Procedure/ProjectFileProcedure.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace Kanboard\Api\Procedure;
+
+use Kanboard\Api\Authorization\ProjectAuthorization;
+use Kanboard\Core\ObjectStorage\ObjectStorageException;
+
+/**
+ * Project File API controller
+ *
+ * @package  Kanboard\Api\Procedure
+ * @author   Frederic Guillot
+ */
+class ProjectFileProcedure extends BaseProcedure
+{
+    public function getProjectFile($project_id, $file_id)
+    {
+        ProjectAuthorization::getInstance($this->container)->check($this->getClassName(), 'getProjectFile', $project_id);
+        return $this->projectFileModel->getById($file_id);
+    }
+
+    public function getAllProjectFiles($project_id)
+    {
+        ProjectAuthorization::getInstance($this->container)->check($this->getClassName(), 'getAllProjectFiles', $project_id);
+        return $this->projectFileModel->getAll($project_id);
+    }
+
+    public function downloadProjectFile($project_id, $file_id)
+    {
+        ProjectAuthorization::getInstance($this->container)->check($this->getClassName(), 'downloadProjectFile', $project_id);
+
+        try {
+            $file = $this->projectFileModel->getById($file_id);
+
+            if (! empty($file)) {
+                return base64_encode($this->objectStorage->get($file['path']));
+            }
+        } catch (ObjectStorageException $e) {
+            $this->logger->error($e->getMessage());
+        }
+
+        return '';
+    }
+
+    public function createProjectFile($project_id, $filename, $blob)
+    {
+        ProjectAuthorization::getInstance($this->container)->check($this->getClassName(), 'createProjectFile', $project_id);
+
+        try {
+            return $this->projectFileModel->uploadContent($project_id, $filename, $blob);
+        } catch (ObjectStorageException $e) {
+            $this->logger->error(__METHOD__.': '.$e->getMessage());
+            return false;
+        }
+    }
+
+    public function removeProjectFile($project_id, $file_id)
+    {
+        ProjectAuthorization::getInstance($this->container)->check($this->getClassName(), 'removeProjectFile', $project_id);
+        return $this->projectFileModel->remove($file_id);
+    }
+
+    public function removeAllProjectFiles($project_id)
+    {
+        ProjectAuthorization::getInstance($this->container)->check($this->getClassName(), 'removeAllProjectFiles', $project_id);
+        return $this->projectFileModel->removeAll($project_id);
+    }
+}