1591e18027
RSS-Bridge currently has to guess the queried context from the data provided by the user. This, however, can cause issues for bridges that have multiple contexts with conflicting parameters (i.e. none). This commit adds context hinting to queries via '&context=<context>' which can be omitted in which case the context is determined as before.
302 lines
7.5 KiB
PHP
302 lines
7.5 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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* An abstract class for bridges
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*
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* This class implements {@see BridgeInterface} with most common functions in
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* order to reduce code duplication. Bridges should inherit from this class
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* instead of implementing the interface manually.
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*
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* @todo Move constants to the interface (this is supported by PHP)
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* @todo Change visibility of constants to protected
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* @todo Return `self` on more functions to allow chaining
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* @todo Add specification for PARAMETERS ()
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* @todo Add specification for $items
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*/
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abstract class BridgeAbstract implements BridgeInterface {
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/**
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* Name of the bridge
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*
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* Use {@see BridgeAbstract::getName()} to read this parameter
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*/
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const NAME = 'Unnamed bridge';
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/**
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* URI to the site the bridge is intended to be used for.
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*
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* Use {@see BridgeAbstract::getURI()} to read this parameter
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*/
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const URI = '';
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/**
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* A brief description of what the bridge can do
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*
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* Use {@see BridgeAbstract::getDescription()} to read this parameter
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*/
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const DESCRIPTION = 'No description provided';
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/**
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* The name of the maintainer. Multiple maintainers can be separated by comma
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*
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* Use {@see BridgeAbstract::getMaintainer()} to read this parameter
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*/
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const MAINTAINER = 'No maintainer';
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/**
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* The default cache timeout for the bridge
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*
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* Use {@see BridgeAbstract::getCacheTimeout()} to read this parameter
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*/
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const CACHE_TIMEOUT = 3600;
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/**
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* Parameters for the bridge
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*
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* Use {@see BridgeAbstract::getParameters()} to read this parameter
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*/
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const PARAMETERS = array();
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/**
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* Holds the list of items collected by the bridge
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*
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* Items must be collected by {@see BridgeInterface::collectData()}
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*
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* Use {@see BridgeAbstract::getItems()} to access items.
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*
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* @var array
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*/
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protected $items = array();
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/**
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* Holds the list of input parameters used by the bridge
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*
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* Do not access this parameter directly!
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* Use {@see BridgeAbstract::setInputs()} and {@see BridgeAbstract::getInput()} instead!
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*
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* @var array
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*/
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protected $inputs = array();
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/**
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* Holds the name of the queried context
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*
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* @var string
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*/
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protected $queriedContext = '';
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/** {@inheritdoc} */
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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.
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*
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* @param array $inputs Associative array of inputs
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* @param string $queriedContext The context name
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* @return void
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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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* Set inputs for the bridge
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*
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* Returns errors and aborts execution if the provided input parameters are
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* invalid.
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*
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* @param array List of input parameters. Each element in this list must
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* relate to an item in {@see BridgeAbstract::PARAMETERS}
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* @return void
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*/
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public function setDatas(array $inputs){
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if(isset($inputs['context'])) { // Context hinting (optional)
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$this->queriedContext = $inputs['context'];
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unset($inputs['context']);
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}
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if(empty(static::PARAMETERS)) {
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if(!empty($inputs)) {
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returnClientError('Invalid parameters value(s)');
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}
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return;
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}
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$validator = new ParameterValidator();
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if(!$validator->validateData($inputs, static::PARAMETERS)) {
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$parameters = array_map(
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function($i){ return $i['name']; }, // Just display parameter names
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$validator->getInvalidParameters()
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);
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returnClientError(
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'Invalid parameters value(s): '
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. implode(', ', $parameters)
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);
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}
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// Guess the context from input data
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if(empty($this->queriedContext)) {
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$this->queriedContext = $validator->getQueriedContext($inputs, static::PARAMETERS);
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}
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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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}
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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 $input The input name
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* @return mixed|null The input value or null if the input is not defined
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*/
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protected function getInput($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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/** {@inheritdoc} */
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public function getDescription(){
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return static::DESCRIPTION;
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}
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/** {@inheritdoc} */
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public function getMaintainer(){
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return static::MAINTAINER;
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}
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/** {@inheritdoc} */
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public function getName(){
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return static::NAME;
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}
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/** {@inheritdoc} */
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public function getIcon(){
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return '';
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}
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/** {@inheritdoc} */
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public function getParameters(){
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return static::PARAMETERS;
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}
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/** {@inheritdoc} */
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public function getURI(){
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return static::URI;
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}
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/** {@inheritdoc} */
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public function getCacheTimeout(){
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return static::CACHE_TIMEOUT;
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}
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/** {@inheritdoc} */
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public function detectParameters($url){
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$regex = '/^(https?:\/\/)?(www\.)?(.+?)(\/)?$/';
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if(empty(static::PARAMETERS)
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&& preg_match($regex, $url, $urlMatches) > 0
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&& preg_match($regex, static::URI, $bridgeUriMatches) > 0
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&& $urlMatches[3] === $bridgeUriMatches[3]) {
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return array();
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} else {
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return null;
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}
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}
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}
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