149 lines
3.6 KiB
PHP
149 lines
3.6 KiB
PHP
<?php
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class AmazonPriceTrackerBridge extends BridgeAbstract {
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const MAINTAINER = 'captn3m0';
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const NAME = 'Amazon Price Tracker';
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const URI = 'https://www.amazon.com/';
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const CACHE_TIMEOUT = 3600; // 1h
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const DESCRIPTION = 'Tracks price for a single product on Amazon';
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const PARAMETERS = array(
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array(
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'asin' => array(
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'name' => 'ASIN',
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'required' => true,
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'exampleValue' => 'B071GB1VMQ',
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// https://stackoverflow.com/a/12827734
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'pattern' => 'B[\dA-Z]{9}|\d{9}(X|\d)',
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),
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'tld' => array(
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'name' => 'Country',
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'type' => 'list',
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'required' => true,
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'values' => array(
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'Australia' => 'com.au',
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'Brazil' => 'com.br',
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'Canada' => 'ca',
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'China' => 'cn',
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'France' => 'fr',
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'Germany' => 'de',
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'India' => 'in',
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'Italy' => 'it',
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'Japan' => 'co.jp',
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'Mexico' => 'com.mx',
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'Netherlands' => 'nl',
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'Spain' => 'es',
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'United Kingdom' => 'co.uk',
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'United States' => 'com',
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),
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'defaultValue' => 'com',
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),
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));
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protected $title;
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/**
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* Generates domain name given a amazon TLD
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*/
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private function getDomainName() {
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return 'https://www.amazon.' . $this->getInput('tld');
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}
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/**
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* Generates URI for a Amazon product page
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*/
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public function getURI() {
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if (!is_null($this->getInput('asin'))) {
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return $this->getDomainName() . '/dp/' . $this->getInput('asin') . '/';
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}
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return parent::getURI();
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}
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/**
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* Scrapes the product title from the html page
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* returns the default title if scraping fails
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*/
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private function getTitle($html) {
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$titleTag = $html->find('#productTitle', 0);
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if (!$titleTag) {
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return $this->getDefaultTitle();
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} else {
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return trim(html_entity_decode($titleTag->innertext, ENT_QUOTES));
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}
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}
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/**
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* Title used by the feed if none could be found
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*/
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private function getDefaultTitle() {
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return 'Amazon.' . $this->getInput('tld') . ': ' . $this->getInput('asin');
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}
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/**
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* Returns name for the feed
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* Uses title (already scraped) if it has one
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*/
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public function getName() {
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if (isset($this->title)) {
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return $this->title;
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} else {
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return parent::getName();
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}
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}
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/**
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* Returns a generated image tag for the product
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*/
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private function getImage($html) {
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$imageSrc = $html->find('#main-image-container img', 0);
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if ($imageSrc) {
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$imageSrc = $imageSrc ? $imageSrc->getAttribute('data-old-hires') : '';
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return <<<EOT
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<img width="300" style="max-width:300;max-height:300" src="$imageSrc" alt="{$this->title}" />
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EOT;
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}
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}
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/**
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* Return \simple_html_dom object
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* for the entire html of the product page
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*/
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private function getHtml() {
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$uri = $this->getURI();
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return getSimpleHTMLDOM($uri) ?: returnServerError('Could not request Amazon.');
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}
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/**
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* Scrape method for Amazon product page
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* @return [type] [description]
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*/
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public function collectData() {
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$html = $this->getHtml();
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$this->title = $this->getTitle($html);
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$imageTag = $this->getImage($html);
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$asinData = $html->find('#cerberus-data-metrics', 0);
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// <div id="cerberus-data-metrics" style="display: none;"
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// data-asin="B00WTHJ5SU" data-asin-price="14.99" data-asin-shipping="0"
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// data-asin-currency-code="USD" data-substitute-count="-1" ... />
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$currency = $asinData->getAttribute('data-asin-currency-code');
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$shipping = $asinData->getAttribute('data-asin-shipping');
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$price = $asinData->getAttribute('data-asin-price');
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$item = array(
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'title' => $this->title,
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'uri' => $this->getURI(),
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'content' => "$imageTag<br/>Price: $price $currency",
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);
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if ($shipping !== '0') {
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$item['content'] .= "<br>Shipping: $shipping $currency</br>";
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}
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$this->items[] = $item;
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}
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}
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