243 lines
7.1 KiB
PHP
243 lines
7.1 KiB
PHP
<?php
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/**
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* This file is part of RSS-Bridge, a PHP project capable of generating RSS and
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* Atom feeds for websites that don't have one.
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*
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* For the full license information, please view the UNLICENSE file distributed
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* with this source code.
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*
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* @package Core
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* @license http://unlicense.org/ UNLICENSE
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* @link https://github.com/rss-bridge/rss-bridge
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*/
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/**
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* Factory class responsible for creating bridge objects from a given working
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* directory, limited by a whitelist.
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*
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* This class is capable of:
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* - Locating bridge classes in the specified working directory (see {@see Bridge::$workingDir})
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* - Filtering bridges based on a whitelist (see {@see Bridge::$whitelist})
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* - Creating new bridge instances based on the bridge's name (see {@see Bridge::create()})
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*
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* The following example illustrates the intended use for this class.
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*
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* ```PHP
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* require_once __DIR__ . '/rssbridge.php';
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*
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* // Step 1: Set the working directory
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* Bridge::setWorkingDir(__DIR__ . '/../bridges/');
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*
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* // Step 2: Add bridges to the whitelist
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* Bridge::setWhitelist(array('GitHubIssue', 'GoogleSearch', 'Facebook', 'Twitter'));
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*
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* // Step 3: Create a new instance of a bridge (based on the name)
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* $bridge = Bridge::create('GitHubIssue');
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* ```
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*/
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class BridgeFactory extends FactoryAbstract {
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/**
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* Holds a list of whitelisted bridges.
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*
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* Do not access this property directly!
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* Use {@see Bridge::getWhitelist()} instead.
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*
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* @var array
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*/
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protected $whitelist = array();
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/**
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* Creates a new bridge object from the working directory.
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*
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* @throws \InvalidArgumentException if the requested bridge name is invalid.
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* @throws \Exception if the requested bridge doesn't exist in the working
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* directory.
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* @param string $name Name of the bridge object.
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* @return object|bool The bridge object or false if the class is not instantiable.
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*/
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public function create($name){
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if(!$this->isBridgeName($name)) {
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throw new \InvalidArgumentException('Bridge name invalid!');
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}
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$name = $this->sanitizeBridgeName($name) . 'Bridge';
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$filePath = $this->getWorkingDir() . $name . '.php';
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if(!file_exists($filePath)) {
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throw new \Exception('Bridge file ' . $filePath . ' does not exist!');
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}
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require_once $filePath;
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if((new \ReflectionClass($name))->isInstantiable()) {
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return new $name();
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}
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return false;
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}
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/**
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* Returns true if the provided name is a valid bridge name.
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*
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* A valid bridge name starts with a capital letter ([A-Z]), followed by
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* zero or more alphanumeric characters or hyphen ([A-Za-z0-9-]).
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*
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* @param string $name The bridge name.
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* @return bool true if the name is a valid bridge name, false otherwise.
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*/
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public function isBridgeName($name){
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return is_string($name) && preg_match('/^[A-Z][a-zA-Z0-9-]*$/', $name) === 1;
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}
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/**
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* Returns the list of bridge names from the working directory.
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*
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* The list is cached internally to allow for successive calls.
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*
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* @return array List of bridge names
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*/
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public function getBridgeNames(){
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static $bridgeNames = array(); // Initialized on first call
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if(empty($bridgeNames)) {
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$files = scandir($this->getWorkingDir());
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if($files !== false) {
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foreach($files as $file) {
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if(preg_match('/^([^.]+)Bridge\.php$/U', $file, $out)) {
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$bridgeNames[] = $out[1];
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}
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}
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}
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}
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return $bridgeNames;
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}
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/**
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* Checks if a bridge is whitelisted.
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*
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* @param string $name Name of the bridge.
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* @return bool True if the bridge is whitelisted.
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*/
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public function isWhitelisted($name){
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return in_array($this->sanitizeBridgeName($name), $this->getWhitelist());
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}
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/**
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* Returns the whitelist.
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*
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* On first call this function reads the whitelist from {@see WHITELIST} if
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* the file exists, {@see WHITELIST_DEFAULT} otherwise.
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* * Each line in the file specifies one bridge on the whitelist.
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* * An empty file disables all bridges.
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* * If the file only only contains `*`, all bridges are whitelisted.
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*
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* Use {@see Bridge::setWhitelist()} to specify a default whitelist **before**
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* calling this function! The list is cached internally to allow for
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* successive calls. If {@see Bridge::setWhitelist()} gets called after this
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* function, the whitelist is **not** updated again!
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*
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* @return array Array of whitelisted bridges
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*/
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public function getWhitelist() {
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static $firstCall = true; // Initialized on first call
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if($firstCall) {
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if(file_exists(WHITELIST)) {
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$contents = trim(file_get_contents(WHITELIST));
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} elseif(file_exists(WHITELIST_DEFAULT)) {
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$contents = trim(file_get_contents(WHITELIST_DEFAULT));
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} else {
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$contents = '';
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}
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if($contents === '*') { // Whitelist all bridges
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$this->whitelist = $this->getBridgeNames();
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} else {
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//$this->$whitelist = array_map('$this->sanitizeBridgeName', explode("\n", $contents));
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foreach(explode("\n", $contents) as $bridgeName) {
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$this->whitelist[] = $this->sanitizeBridgeName($bridgeName);
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}
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}
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}
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return $this->whitelist;
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}
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/**
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* Sets the (default) whitelist.
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*
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* If this function is called **before** {@see Bridge::getWhitelist()}, the
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* provided whitelist will be replaced by a custom whitelist specified in
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* {@see WHITELIST} (if it exists).
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*
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* If this function is called **after** {@see Bridge::getWhitelist()}, the
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* provided whitelist is taken as is (not updated by the custom whitelist
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* again).
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*
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* @param array $default The whitelist as array of bridge names.
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* @return void
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*/
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public function setWhitelist($default = array()) {
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$this->whitelist = array_map('$this->sanitizeBridgeName', $default);
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}
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/**
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* Returns the sanitized bridge name.
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*
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* The bridge name can be specified in various ways:
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* * The PHP file name (i.e. `GitHubIssueBridge.php`)
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* * The PHP file name without file extension (i.e. `GitHubIssueBridge`)
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* * The bridge name (i.e. `GitHubIssue`)
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*
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* Casing is ignored (i.e. `GITHUBISSUE` and `githubissue` are the same).
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*
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* A bridge file matching the given bridge name must exist in the working
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* directory!
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*
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* @param string $name The bridge name
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* @return string|null The sanitized bridge name if the provided name is
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* valid, null otherwise.
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*/
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protected function sanitizeBridgeName($name) {
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if(is_string($name)) {
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// Trim trailing '.php' if exists
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if(preg_match('/(.+)(?:\.php)/', $name, $matches)) {
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$name = $matches[1];
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}
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// Trim trailing 'Bridge' if exists
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if(preg_match('/(.+)(?:Bridge)/i', $name, $matches)) {
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$name = $matches[1];
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}
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// Improve performance for correctly written bridge names
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if(in_array($name, $this->getBridgeNames())) {
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$index = array_search($name, $this->getBridgeNames());
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return $this->getBridgeNames()[$index];
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}
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// The name is valid if a corresponding bridge file is found on disk
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if(in_array(strtolower($name), array_map('strtolower', $this->getBridgeNames()))) {
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$index = array_search(strtolower($name), array_map('strtolower', $this->getBridgeNames()));
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return $this->getBridgeNames()[$index];
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}
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Debug::log('Invalid bridge name specified: "' . $name . '"!');
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}
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return null; // Bad parameter
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}
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}
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