summaryrefslogtreecommitdiffstats
path: root/library/Icinga/Web/FileCache.php
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 11:46:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 11:46:43 +0000
commit3e02d5aff85babc3ffbfcf52313f2108e313aa23 (patch)
treeb01f3923360c20a6a504aff42d45670c58af3ec5 /library/Icinga/Web/FileCache.php
parentInitial commit. (diff)
downloadicingaweb2-3e02d5aff85babc3ffbfcf52313f2108e313aa23.tar.xz
icingaweb2-3e02d5aff85babc3ffbfcf52313f2108e313aa23.zip
Adding upstream version 2.12.1.upstream/2.12.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'library/Icinga/Web/FileCache.php')
-rw-r--r--library/Icinga/Web/FileCache.php293
1 files changed, 293 insertions, 0 deletions
diff --git a/library/Icinga/Web/FileCache.php b/library/Icinga/Web/FileCache.php
new file mode 100644
index 0000000..03f0c19
--- /dev/null
+++ b/library/Icinga/Web/FileCache.php
@@ -0,0 +1,293 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+class FileCache
+{
+ /**
+ * FileCache singleton instances
+ *
+ * @var array
+ */
+ protected static $instances = array();
+
+ /**
+ * Cache instance base directory
+ *
+ * @var string
+ */
+ protected $basedir;
+
+ /**
+ * Instance name
+ *
+ * @var string
+ */
+ protected $name;
+
+ /**
+ * Whether the cache is enabled
+ *
+ * @var bool
+ */
+ protected $enabled = false;
+
+ /**
+ * The protected constructor creates a new instance with the given name
+ *
+ * @param string $name Cache instance name
+ */
+ protected function __construct($name)
+ {
+ $this->name = $name;
+ $tmpDir = sys_get_temp_dir();
+ $runtimePath = $tmpDir . '/FileCache_' . $name;
+ if (is_dir($runtimePath)) {
+ // Don't combine the following if with the above because else the elseif path will be evaluated if the
+ // runtime path exists and is not writeable
+ if (is_writeable($runtimePath)) {
+ $this->basedir = $runtimePath;
+ $this->enabled = true;
+ }
+ } elseif (is_dir($tmpDir) && is_writeable($tmpDir) && @mkdir($runtimePath, octdec('1750'), true)) {
+ // Suppress mkdir errors because it may error w/ no such file directory if the systemd private tmp directory
+ // for the web server has been removed
+ $this->basedir = $runtimePath;
+ $this->enabled = true;
+ }
+ }
+
+ /**
+ * Store the given content to the desired file name
+ *
+ * @param string $file new (relative) filename
+ * @param string $content the content to be stored
+ *
+ * @return bool whether the file has been stored
+ */
+ public function store($file, $content)
+ {
+ if (! $this->enabled) {
+ return false;
+ }
+
+ return file_put_contents($this->filename($file), $content);
+ }
+
+ /**
+ * Find out whether a given file exists
+ *
+ * @param string $file the (relative) filename
+ * @param int $newerThan optional timestamp to compare against
+ *
+ * @return bool whether such file exists
+ */
+ public function has($file, $newerThan = null)
+ {
+ if (! $this->enabled) {
+ return false;
+ }
+
+ $filename = $this->filename($file);
+
+ if (! file_exists($filename) || ! is_readable($filename)) {
+ return false;
+ }
+
+ if ($newerThan === null) {
+ return true;
+ }
+
+ $info = stat($filename);
+
+ if ($info === false) {
+ return false;
+ }
+
+ return (int) $newerThan < $info['mtime'];
+ }
+
+ /**
+ * Get a specific file or false if no such file available
+ *
+ * @param string $file the disired file name
+ *
+ * @return string|bool Filename content or false
+ */
+ public function get($file)
+ {
+ if ($this->has($file)) {
+ return file_get_contents($this->filename($file));
+ }
+
+ return false;
+ }
+
+ /**
+ * Send a specific file to the browser (output)
+ *
+ * @param string $file the disired file name
+ *
+ * @return bool Whether the file has been sent
+ */
+ public function send($file)
+ {
+ if ($this->has($file)) {
+ readfile($this->filename($file));
+
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Get absolute filename for a given file
+ *
+ * @param string $file the disired file name
+ *
+ * @return string absolute filename
+ */
+ protected function filename($file)
+ {
+ return $this->basedir . '/' . $file;
+ }
+
+ /**
+ * Prepare a sub directory with the given name and return its path
+ *
+ * @param string $name
+ *
+ * @return string|false Returns FALSE in case the cache is not enabled or an error occurred
+ */
+ public function directory($name)
+ {
+ if (! $this->enabled) {
+ return false;
+ }
+
+ $path = $this->filename($name);
+ if (! is_dir($path) && ! @mkdir($path, octdec('1750'), true)) {
+ return false;
+ }
+
+ return $path;
+ }
+
+ /**
+ * Whether the given ETag matches a cached file
+ *
+ * If no ETag is given we'll try to fetch the one from the current
+ * HTTP request.
+ *
+ * @param string $file The cached file you want to check
+ * @param string $match The ETag to match against
+ *
+ * @return string|bool ETag on match, otherwise false
+ */
+ public function etagMatchesCachedFile($file, $match = null)
+ {
+ return self::etagMatchesFiles($this->filename($file), $match);
+ }
+
+ /**
+ * Create an ETag for the given file
+ *
+ * @param string $file The desired cache file
+ *
+ * @return string your ETag
+ */
+ public function etagForCachedFile($file)
+ {
+ return self::etagForFiles($this->filename($file));
+ }
+
+ /**
+ * Whether the given ETag matchesspecific file(s) on disk
+ *
+ * @param string|array $files file(s) to check
+ * @param string $match ETag to match against
+ *
+ * @return string|bool ETag on match, otherwise false
+ */
+ public static function etagMatchesFiles($files, $match = null)
+ {
+ if ($match === null) {
+ $match = isset($_SERVER['HTTP_IF_NONE_MATCH'])
+ ? trim($_SERVER['HTTP_IF_NONE_MATCH'], '"')
+ : false;
+ }
+ if (! $match) {
+ return false;
+ }
+
+ if (preg_match('/([0-9a-f]{8}-[0-9a-f]{8}-[0-9a-f]{8})-\w+/i', $match, $matches)) {
+ // Removes compression suffixes as our custom algorithm can't handle compressed cache files anyway
+ $match = $matches[1];
+ }
+
+ $etag = self::etagForFiles($files);
+ return $match === $etag ? $etag : false;
+ }
+
+ /**
+ * Create ETag for the given files
+ *
+ * Custom algorithm creating an ETag based on filenames, mtimes
+ * and file sizes. Supports single files or a list of files. This
+ * way we are able to create ETags for virtual files depending on
+ * multiple source files (e.g. compressed JS, CSS).
+ *
+ * @param string|array $files Single file or a list of such
+ *
+ * @return string The generated ETag
+ */
+ public static function etagForFiles($files)
+ {
+ if (is_string($files)) {
+ $files = array($files);
+ }
+
+ $sizes = array();
+ $mtimes = array();
+
+ foreach ($files as $file) {
+ $file = realpath($file);
+ if ($file !== false && $info = stat($file)) {
+ $mtimes[] = $info['mtime'];
+ $sizes[] = $info['size'];
+ } else {
+ $mtimes[] = time();
+ $sizes[] = 0;
+ }
+ }
+
+ return sprintf(
+ '%s-%s-%s',
+ hash('crc32', implode('|', $files)),
+ hash('crc32', implode('|', $sizes)),
+ hash('crc32', implode('|', $mtimes))
+ );
+ }
+
+ /**
+ * Factory creating your cache instance
+ *
+ * @param string $name Instance name
+ *
+ * @return FileCache
+ */
+ public static function instance($name = 'icingaweb')
+ {
+ if ($name !== 'icingaweb') {
+ $name = 'icingaweb/modules/' . $name;
+ }
+
+ if (!array_key_exists($name, self::$instances)) {
+ self::$instances[$name] = new static($name);
+ }
+
+ return self::$instances[$name];
+ }
+}