feat(FileCache): add config option "path"

bridges/PixivBridge.php

@@ -186,6 +186,9 @@ public function collectData()
         }
     }
 
+    /**
+     * todo: remove manual file cache
+     */
     private function cacheImage($url, $illustId, $isImage)
     {
         $illustId = preg_replace('/[^0-9]/', '', $illustId);

caches/FileCache.php

@@ -3,14 +3,18 @@
 class FileCache implements CacheInterface
 {
     private array $config;
-    protected $path;
+    protected $scope;
     protected $key;
 
     public function __construct(array $config = [])
     {
         $this->config = $config;
-        if (!is_writable(PATH_CACHE)) {
-            throw new \Exception('The cache folder is not writeable');
+
+        if (!is_dir($this->config['path'])) {
+            throw new \Exception('The cache path does not exists. You probably want: mkdir cache && chown www-data:www-data cache');
+        }
+        if (!is_writable($this->config['path'])) {
+            throw new \Exception('The cache path is not writeable. You probably want: chown www-data:www-data cache');
         }
     }
 
@@ -26,7 +30,7 @@ public function saveData($data)
     {
         $writeStream = file_put_contents($this->getCacheFile(), serialize($data));
         if ($writeStream === false) {
-            throw new \Exception('Cannot write the cache... Do you have the right permissions ?');
+            throw new \Exception('The cache path is not writeable. You probably want: chown www-data:www-data cache');
         }
         return $this;
     }
@@ -52,7 +56,7 @@ public function purgeCache($seconds)
             return;
         }
 
-        $cachePath = $this->getPath();
+        $cachePath = $this->getScope();
         if (!file_exists($cachePath)) {
             return;
         }
@@ -79,7 +83,7 @@ public function setScope($scope)
             throw new \Exception('The given scope is invalid!');
         }
 
-        $this->path = PATH_CACHE . trim($scope, " \t\n\r\0\x0B\\\/") . '/';
+        $this->scope = $this->config['path'] . trim($scope, " \t\n\r\0\x0B\\\/") . '/';
 
         return $this;
     }
@@ -96,24 +100,24 @@ public function setKey($key)
         return $this;
     }
 
-    private function getPath()
+    private function getScope()
     {
-        if (is_null($this->path)) {
+        if (is_null($this->scope)) {
             throw new \Exception('Call "setScope" first!');
         }
 
-        if (!is_dir($this->path)) {
-            if (mkdir($this->path, 0755, true) !== true) {
+        if (!is_dir($this->scope)) {
+            if (mkdir($this->scope, 0755, true) !== true) {
                 throw new \Exception('mkdir: Unable to create file cache folder');
             }
         }
 
-        return $this->path;
+        return $this->scope;
     }
 
     private function getCacheFile()
     {
-        return $this->getPath() . $this->getCacheName();
+        return $this->getScope() . $this->getCacheName();
     }
 
     private function getCacheName()

config.default.ini.php

@@ -96,6 +96,9 @@
 ; --- Cache specific configuration ---------------------------------------------
 
 [FileCache]
+; The root folder to store files in.
+; "" = Use the cache folder in the repository (default)
+path = ""
 ; Whether to actually delete files when purging. Can be useful to turn off to increase performance.
 enable_purge = true
 

lib/CacheFactory.php

@@ -39,6 +39,8 @@ public function create(string $name = null): CacheInterface
                 return new NullCache();
             case FileCache::class:
                 return new FileCache([
+                    // Intentionally checking for "truthy" value
+                    'path' => Configuration::getConfig('FileCache', 'path') ?: PATH_CACHE,
                     'enable_purge' => Configuration::getConfig('FileCache', 'enable_purge'),
                 ]);
             case SQLiteCache::class:

lib/utils.php

@@ -226,3 +226,8 @@ function now(): \DateTimeImmutable
 {
     return new \DateTimeImmutable();
 }
+
+function create_random_string(int $bytes = 16): string
+{
+    return bin2hex(openssl_random_pseudo_bytes($bytes));
+}

tests/CacheTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace RssBridge\Tests;
+
+use PHPUnit\Framework\TestCase;
+
+class CacheTest extends TestCase
+{
+    public function testFileCache()
+    {
+        $temporaryFolder = sprintf('%s/rss_bridge_%s/', sys_get_temp_dir(), create_random_string());
+        mkdir($temporaryFolder);
+
+        $sut = new \FileCache([
+            'path' => $temporaryFolder,
+            'enable_purge' => true,
+        ]);
+        $sut->setScope('scope');
+        $sut->purgeCache(-1);
+        $sut->setKey(['key']);
+
+        $this->assertNull($sut->loadData());
+
+        $sut->saveData('data');
+        $this->assertSame('data', $sut->loadData());
+        $this->assertIsNumeric($sut->getTime());
+        $sut->purgeCache(-1);
+
+        // Intentionally not deleting the temp folder
+    }
+}

tests/UtilsTest.php

@@ -26,21 +26,6 @@ public function testFormatBytes()
         $this->assertSame('1 TB', format_bytes(1024 ** 4));
     }
 
-    public function testFileCache()
-    {
-        $sut = new \FileCache(['enable_purge' => true]);
-        $sut->setScope('scope');
-        $sut->purgeCache(-1);
-        $sut->setKey(['key']);
-
-        $this->assertNull($sut->loadData());
-
-        $sut->saveData('data');
-        $this->assertSame('data', $sut->loadData());
-        $this->assertIsNumeric($sut->getTime());
-        $sut->purgeCache(-1);
-    }
-
     public function testSanitizePathName()
     {
         $this->assertSame('index.php', _sanitize_path_name('/home/satoshi/rss-bridge/index.php', '/home/satoshi/rss-bridge'));
@@ -54,4 +39,11 @@ public function testSanitizePathNameInErrorMessage()
         $sanitized = 'Error: Argument 1 passed to foo() must be an instance of kk, string given, called in bridges/RumbleBridge.php';
         $this->assertSame($sanitized, _sanitize_path_name($raw, '/home/satoshi/rss-bridge'));
     }
+
+    public function testCreateRandomString()
+    {
+        $this->assertSame(2, strlen(create_random_string(1)));
+        $this->assertSame(4, strlen(create_random_string(2)));
+        $this->assertSame(6, strlen(create_random_string(3)));
+    }
 }