319 lines
8.2 KiB
PHP
319 lines
8.2 KiB
PHP
<?php
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require_once(__DIR__ . '/BridgeInterface.php');
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abstract class BridgeAbstract implements BridgeInterface {
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const NAME = 'Unnamed bridge';
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const URI = '';
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const DESCRIPTION = 'No description provided';
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const MAINTAINER = 'No maintainer';
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const CACHE_TIMEOUT = 3600;
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const PARAMETERS = array();
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protected $cache;
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protected $extraInfos;
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protected $items = array();
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protected $inputs = array();
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protected $queriedContext = '';
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protected $cacheTimeout;
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/**
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* Return cachable datas (extrainfos and items) stored in the bridge
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* @return mixed
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*/
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public function getCachable(){
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return array(
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'items' => $this->getItems(),
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'extraInfos' => $this->getExtraInfos()
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);
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}
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/**
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* Return items stored in the bridge
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* @return mixed
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*/
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public function getItems(){
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return $this->items;
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}
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/**
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* Sets the input values for a given context. Existing values are
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* overwritten.
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*
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* @param array $inputs Associative array of inputs
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* @param string $context The context name
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*/
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protected function setInputs(array $inputs, $queriedContext){
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// Import and assign all inputs to their context
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foreach($inputs as $name => $value) {
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foreach(static::PARAMETERS as $context => $set) {
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if(array_key_exists($name, static::PARAMETERS[$context])) {
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$this->inputs[$context][$name]['value'] = $value;
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}
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}
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}
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// Apply default values to missing data
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$contexts = array($queriedContext);
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if(array_key_exists('global', static::PARAMETERS)) {
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$contexts[] = 'global';
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}
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foreach($contexts as $context) {
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foreach(static::PARAMETERS[$context] as $name => $properties) {
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if(isset($this->inputs[$context][$name]['value'])) {
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continue;
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}
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$type = isset($properties['type']) ? $properties['type'] : 'text';
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switch($type) {
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case 'checkbox':
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if(!isset($properties['defaultValue'])) {
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$this->inputs[$context][$name]['value'] = false;
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} else {
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$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
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}
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break;
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case 'list':
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if(!isset($properties['defaultValue'])) {
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$firstItem = reset($properties['values']);
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if(is_array($firstItem)) {
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$firstItem = reset($firstItem);
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}
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$this->inputs[$context][$name]['value'] = $firstItem;
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} else {
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$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
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}
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break;
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default:
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if(isset($properties['defaultValue'])) {
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$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
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}
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break;
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}
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}
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}
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// Copy global parameter values to the guessed context
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if(array_key_exists('global', static::PARAMETERS)) {
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foreach(static::PARAMETERS['global'] as $name => $properties) {
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if(isset($inputs[$name])) {
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$value = $inputs[$name];
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} elseif(isset($properties['value'])) {
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$value = $properties['value'];
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} else {
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continue;
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}
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$this->inputs[$queriedContext][$name]['value'] = $value;
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}
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}
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// Only keep guessed context parameters values
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if(isset($this->inputs[$queriedContext])) {
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$this->inputs = array($queriedContext => $this->inputs[$queriedContext]);
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} else {
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$this->inputs = array();
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}
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}
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/**
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* Returns the name of the context matching the provided inputs
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*
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* @param array $inputs Associative array of inputs
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* @return mixed Returns the context name or null if no match was found
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*/
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protected function getQueriedContext(array $inputs){
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$queriedContexts = array();
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// Detect matching context
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foreach(static::PARAMETERS as $context => $set) {
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$queriedContexts[$context] = null;
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// Check if all parameters of the context are satisfied
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foreach($set as $id => $properties) {
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if(isset($inputs[$id]) && !empty($inputs[$id])) {
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$queriedContexts[$context] = true;
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} elseif(isset($properties['required'])
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&& $properties['required'] === true) {
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$queriedContexts[$context] = false;
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break;
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}
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}
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}
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// Abort if one of the globally required parameters is not satisfied
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if(array_key_exists('global', static::PARAMETERS)
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&& $queriedContexts['global'] === false) {
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return null;
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}
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unset($queriedContexts['global']);
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switch(array_sum($queriedContexts)) {
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case 0: // Found no match, is there a context without parameters?
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foreach($queriedContexts as $context => $queried) {
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if(is_null($queried)) {
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return $context;
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}
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}
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return null;
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case 1: // Found unique match
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return array_search(true, $queriedContexts);
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default: return false;
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}
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}
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/**
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* Defined datas with parameters depending choose bridge
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* Note : you can define a cache with "setCache"
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* @param array array with expected bridge paramters
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*/
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public function setDatas(array $inputs){
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if(!is_null($this->cache)) {
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$time = $this->cache->getTime();
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if($time !== false
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&& (time() - $this->getCacheTimeout() < $time)
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&& (!defined('DEBUG') || DEBUG !== true)) {
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$cached = $this->cache->loadData();
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if(isset($cached['items']) && isset($cached['extraInfos'])) {
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$this->items = $cached['items'];
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$this->extraInfos = $cached['extraInfos'];
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return;
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}
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}
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}
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if(empty(static::PARAMETERS)) {
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if(!empty($inputs)) {
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returnClientError('Invalid parameters value(s)');
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}
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$this->collectData();
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if(!is_null($this->cache)) {
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$this->cache->saveData($this->getCachable());
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}
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return;
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}
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if(!validateData($inputs, static::PARAMETERS)) {
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returnClientError('Invalid parameters value(s)');
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}
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// Guess the paramter context from input data
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$this->queriedContext = $this->getQueriedContext($inputs);
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if(is_null($this->queriedContext)) {
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returnClientError('Required parameter(s) missing');
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} elseif($this->queriedContext === false) {
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returnClientError('Mixed context parameters');
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}
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$this->setInputs($inputs, $this->queriedContext);
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$this->collectData();
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if(!is_null($this->cache)) {
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$this->cache->saveData($this->getCachable());
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}
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}
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/**
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* Returns the value for the provided input
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*
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* @param string $input The input name
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* @return mixed Returns the input value or null if the input is not defined
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*/
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protected function getInput($input){
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if(!isset($this->inputs[$this->queriedContext][$input]['value'])) {
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return null;
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}
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return $this->inputs[$this->queriedContext][$input]['value'];
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}
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public function getDescription(){
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return static::DESCRIPTION;
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}
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public function getMaintainer(){
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return static::MAINTAINER;
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}
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public function getName(){
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// Return cached name when bridge is using cached data
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if(isset($this->extraInfos)) {
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return $this->extraInfos['name'];
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}
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return static::NAME;
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}
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public function getIcon(){
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// Return cached icon when bridge is using cached data
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if(isset($this->extraInfos)) {
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return $this->extraInfos['icon'];
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}
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return '';
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}
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public function getParameters(){
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return static::PARAMETERS;
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}
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public function getURI(){
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// Return cached uri when bridge is using cached data
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if(isset($this->extraInfos)) {
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return $this->extraInfos['uri'];
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}
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return static::URI;
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}
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public function getExtraInfos(){
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return array(
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'name' => $this->getName(),
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'uri' => $this->getURI(),
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'icon' => $this->getIcon()
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);
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}
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public function setCache(\CacheInterface $cache){
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$this->cache = $cache;
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}
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public function setCacheTimeout($timeout){
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if(is_numeric($timeout) && ($timeout < 1 || $timeout > 86400)) {
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$this->cacheTimeout = static::CACHE_TIMEOUT;
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return;
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}
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$this->cacheTimeout = $timeout;
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}
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public function getCacheTimeout(){
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return isset($this->cacheTimeout) ? $this->cacheTimeout : static::CACHE_TIMEOUT;
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}
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public function getCacheTime(){
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return !is_null($this->cache) ? $this->cache->getTime() : false;
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}
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public function dieIfNotModified(){
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if ((defined('DEBUG') && DEBUG === true)) return; // disabled in debug mode
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$if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? $_SERVER['HTTP_IF_MODIFIED_SINCE'] : false;
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if (!$if_modified_since) return; // If-Modified-Since value is required
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$last_modified = $this->getCacheTime();
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if (!$last_modified) return; // did not detect cache time
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if (time() - $this->getCacheTimeout() > $last_modified) return; // cache timeout
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$last_modified = (gmdate('D, d M Y H:i:s ', $last_modified) . 'GMT');
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if ($if_modified_since == $last_modified) {
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header('HTTP/1.1 304 Not Modified');
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die();
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}
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}
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}
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