From 6ffc729cc7c17db3971da70287462420bc75eada Mon Sep 17 00:00:00 2001
From: Christopher Vagnetoft <cvagnetoft@gmail.com>
Date: Sun, 11 Oct 2020 03:09:54 +0200
Subject: [PATCH] Initial commit

---
 .gitignore         |   2 +
 composer.json      |  25 +++++++
 src/LocalCache.php | 176 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 203 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 composer.json
 create mode 100644 src/LocalCache.php

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ff72e2d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/composer.lock
+/vendor
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..1a0d752
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,25 @@
+{
+    "name": "noccylabs/local-cache",
+    "description": "A local system-wide always available cache",
+    "type": "library",
+    "license": "GPL-3.0-or-later",
+    "authors": [
+        {
+            "name": "Christopher Vagnetoft",
+            "email": "cvagnetoft@gmail.com"
+        }
+    ],
+    "require": {
+        "psr/log": "^1.1",
+        "psr/cache": "^1.0",
+        "psr/simple-cache": "^1.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "NoccyLabs\\LocalCache\\": "src/"
+        }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.4"
+    }
+}
diff --git a/src/LocalCache.php b/src/LocalCache.php
new file mode 100644
index 0000000..94498b7
--- /dev/null
+++ b/src/LocalCache.php
@@ -0,0 +1,176 @@
+<?php
+
+namespace NoccyLabs\LocalCache;
+
+use Psr\SimpleCache\InvalidArgumentException;
+use Psr\SimpleCache\CacheInterface;
+use Psr\SimpleCache\CacheException;
+
+class LocalCache implements CacheInterface
+{
+
+    private $cacheDir;
+
+    private $poolName;
+
+    private $defaultTtl = 3600;
+
+    public function __construct(string $poolName)
+    {
+        $this->poolName = preg_replace("/[^a-zA-Z0-9_\\-]/", "_", $poolName);
+        $this->cacheDir = $this->findCachePath();
+    }
+
+    protected function findCachePath(): string
+    {
+        $candidates = [
+            '/var/cache',
+            getenv("HOME").'/.cache',
+        ];
+        while ($candidate = array_shift($candidates)) {
+            if (!is_writable($candidate)) {
+                continue;
+            }
+            $path = $candidate . DIRECTORY_SEPARATOR . 'php-localcache';
+            /*
+            if (!is_dir($path)) {
+                @mkdir($path);
+                if (!is_dir($path)) {
+                    continue;
+                }
+            }
+            */
+            return $path;
+        }
+        throw new CacheException("Couldn't find a usable cache directory");
+    }
+
+    protected function hashKey(string $key)
+    {
+        $hash = hash("sha256", $key);
+        return $hash;
+    }
+
+    protected function getKeyPath(string $key)
+    {
+        $hash = $this->hashKey($key);
+        // $path = substr($hash, 0, 2) . DIRECTORY_SEPARATOR . substr($hash, 2, 2) . DIRECTORY_SEPARATOR . $hash;
+        $full = $this->cacheDir . DIRECTORY_SEPARATOR . $this->poolName . DIRECTORY_SEPARATOR . $hash; // $path;
+        return $full;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function get($key, $default = null)
+    {
+        if (!$this->has($key)) {
+            return $default;
+        }
+        $path = $this->getKeyPath($key);
+        return file_get_contents($path);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function set($key, $value, $ttl = null)
+    {
+        $info = [
+            'key' => $key,
+            'ttl' => $ttl ?? $this->defaultTtl
+        ];
+        $info['expires'] = time() + $info['ttl'];
+        $path = $this->getKeyPath($key);
+        if (!is_dir(dirname($path))) {
+            mkdir(dirname($path), 0777, true);
+        }
+        file_put_contents($path, $value);
+        file_put_contents($path.".info", serialize($info));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function delete($key)
+    {
+        if (!$this->has($key)) {
+            return;
+        }
+        $path = $this->getKeyPath($key);
+        @unlink($path);
+        @unlink($path.".info");
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function has($key)
+    {
+        $path = $this->getKeyPath($key);
+        if (!file_exists($path)) {
+            return false;
+        }
+
+        $info = unserialize(file_get_contents($path.".info"));
+        if ($info['expires'] < time()) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function clear()
+    {
+        $items = glob($this->cacheDir.DIRECTORY_SEPARATOR.$this->poolName.DIRECTORY_SEPARATOR."*.info");
+        foreach ($items as $item) {
+            unlink(substr($item, 0, -5));
+            unlink($item);
+        }
+        @rmdir($this->cacheDir . DIRECTORY_SEPARATOR . $this->poolName);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getMultiple($keys, $default = null)
+    {
+        if (!is_iterable($keys)) {
+            throw new InvalidArgumentException("Argument not iterable");
+        }       
+        $ret = [];
+        foreach ($keys as $key) {
+            $ret[$key] = $this->get($key, $default);
+        }
+        return $ret;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function setMultiple($values, $ttl = null)
+    {
+        if (!is_iterable($values)) {
+            throw new InvalidArgumentException("Argument not iterable");
+        }       
+        foreach ($values as $key=>$value) {
+            $this->set($key, $value, $ttl);
+        }        
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function deleteMultiple($keys)
+    {
+        if (!is_iterable($keys)) {
+            throw new InvalidArgumentException("Argument not iterable");
+        }
+        foreach ($keys as $key) {
+            $this->delete($key);
+        }
+    }
+}
\ No newline at end of file