From e4a7079954784a59739e48b0c499ab7432d997d6 Mon Sep 17 00:00:00 2001
From: Dmitry Khomutov <poisoncorpsee@gmail.com>
Date: Tue, 7 Feb 2017 22:08:15 +0700
Subject: [PATCH] Added caching for public build status badge. Issue #15

---
 .../Controller/BuildStatusController.php      | 25 ++++++++++++++-----
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/src/PHPCensor/Controller/BuildStatusController.php b/src/PHPCensor/Controller/BuildStatusController.php
index 055e8dea..8b4e4a6e 100644
--- a/src/PHPCensor/Controller/BuildStatusController.php
+++ b/src/PHPCensor/Controller/BuildStatusController.php
@@ -125,12 +125,16 @@ class BuildStatusController extends Controller
 
     /**
      * Returns the appropriate build status image in SVG format for a given project.
+     *
+     * @param $projectId
+     * 
+     * @return b8\Http\Response|b8\Http\Response\RedirectResponse
      */
     public function image($projectId)
     {
         // plastic|flat|flat-squared|social
-        $style     = $this->getParam('style', 'flat');
-        $label     = $this->getParam('label', 'build');
+        $style = $this->getParam('style', 'flat');
+        $label = $this->getParam('label', 'build');
 
         $optionalParams = [
             'logo'      => $this->getParam('logo'),
@@ -147,21 +151,30 @@ class BuildStatusController extends Controller
             return $response;
         }
 
-        $color = ($status == 'passing') ? 'green' : 'red';
-        $image = file_get_contents(sprintf(
+        $color    = ($status == 'passing') ? 'green' : 'red';
+        $imageUrl = sprintf(
             'http://img.shields.io/badge/%s-%s-%s.svg?style=%s',
             $label,
             $status,
             $color,
             $style
-        ));
+        );
         
         foreach ($optionalParams as $paramName => $param) {
             if ($param) {
-                $image .= '&' . $paramName . '=' . $param;
+                $imageUrl .= '&' . $paramName . '=' . $param;
             }
         }
 
+        $cacheDir  = RUNTIME_DIR . '/status_cache/';
+        $cacheFile = $cacheDir . md5($imageUrl) . '.svg';
+        if (!is_file($cacheFile)) {
+            $image = file_get_contents($imageUrl);
+            file_put_contents($cacheFile, $image);
+        }
+
+        $image = file_get_contents($cacheFile);
+
         $this->response->disableLayout();
         $this->response->setHeader('Content-Type', 'image/svg+xml');
         $this->response->setContent($image);