66 lines
2.1 KiB
PHP
66 lines
2.1 KiB
PHP
<?php
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class FeedReducerBridge extends FeedExpander
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{
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const MAINTAINER = 'mdemoss';
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const NAME = 'Feed Reducer';
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const URI = 'http://github.com/RSS-Bridge/rss-bridge/';
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const DESCRIPTION = 'Choose a percentage of a feed you want to see.';
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const PARAMETERS = [ [
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'url' => [
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'name' => 'Feed URI',
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'exampleValue' => 'https://lorem-rss.herokuapp.com/feed?length=42',
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'required' => true
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],
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'percentage' => [
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'name' => 'percentage',
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'type' => 'number',
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'exampleValue' => 50,
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'required' => true
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]
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]];
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const CACHE_TIMEOUT = 3600;
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public function collectData()
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{
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$url = $this->getInput('url');
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if (preg_match('#^http(s?)://#i', $url)) {
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$this->collectExpandableDatas($url);
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} else {
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throw new Exception('URI must begin with http(s)://');
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}
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}
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public function getItems()
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{
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$filteredItems = [];
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$intPercentage = (int)preg_replace('/[^0-9]/', '', $this->getInput('percentage'));
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foreach ($this->items as $item) {
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// The URL is included in the hash:
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// - so you can change the output by adding a local-part to the URL
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// - so items with the same URI in different feeds won't be correlated
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// $pseudoRandomInteger will be a 16 bit unsigned int mod 100.
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// This won't be uniformly distributed 1-100, but should be close enough.
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$data = $item['uri'] . '::' . $this->getInput('url');
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$hash = hash('sha256', $data, true);
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// S = unsigned 16-bit int
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$pseudoRandomInteger = unpack('S', $hash)[1] % 100;
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if ($pseudoRandomInteger < $intPercentage) {
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$filteredItems[] = $item;
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}
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}
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return $filteredItems;
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}
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public function getName()
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{
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$trimmedPercentage = preg_replace('/[^0-9]/', '', $this->getInput('percentage') ?? '');
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return parent::getName() . ' [' . $trimmedPercentage . '%]';
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}
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}
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