From c7b0c9fd31aa5ce88dbf4d4a0fb7ca71bf8b7f46 Mon Sep 17 00:00:00 2001
From: Nemo <me@captnemo.in>
Date: Mon, 16 Jul 2018 18:24:52 +0530
Subject: [PATCH] Amazon Price Tracker Bridge (#741)

* [amazonprice] Adds AmazonPriceTracker bridge
---
 bridges/AmazonPriceTrackerBridge.php     | 149 +++++++++++++++++++++++
 bridges/ContainerLinuxReleasesBridge.php |   2 +-
 2 files changed, 150 insertions(+), 1 deletion(-)
 create mode 100644 bridges/AmazonPriceTrackerBridge.php

diff --git a/bridges/AmazonPriceTrackerBridge.php b/bridges/AmazonPriceTrackerBridge.php
new file mode 100644
index 00000000..dd352af1
--- /dev/null
+++ b/bridges/AmazonPriceTrackerBridge.php
@@ -0,0 +1,149 @@
+<?php
+
+class AmazonPriceTrackerBridge extends BridgeAbstract {
+	const MAINTAINER = 'captn3m0';
+	const NAME = 'Amazon Price Tracker';
+	const URI = 'https://www.amazon.com/';
+	const CACHE_TIMEOUT = 3600; // 1h
+	const DESCRIPTION = 'Tracks price for a single product on Amazon';
+
+	const PARAMETERS = array(
+		array(
+		'asin' => array(
+			'name' 			=> 'ASIN',
+			'required' 		=> true,
+			'exampleValue' 	=> 'B071GB1VMQ',
+			// https://stackoverflow.com/a/12827734
+			'pattern'		=> 'B[\dA-Z]{9}|\d{9}(X|\d)',
+		),
+		'tld' => array(
+			'name' => 'Country',
+			'type' => 'list',
+			'required' => true,
+			'values' => array(
+				'Australia' 	=> 'com.au',
+				'Brazil' 		=> 'com.br',
+				'Canada' 		=> 'ca',
+				'China' 		=> 'cn',
+				'France' 		=> 'fr',
+				'Germany' 		=> 'de',
+				'India' 		=> 'in',
+				'Italy' 		=> 'it',
+				'Japan' 		=> 'co.jp',
+				'Mexico' 		=> 'com.mx',
+				'Netherlands'	=> 'nl',
+				'Spain' 		=> 'es',
+				'United Kingdom'	=> 'co.uk',
+				'United States'		=> 'com',
+			),
+			'defaultValue' => 'com',
+		),
+	));
+
+	protected $title;
+
+	/**
+	 * Generates domain name given a amazon TLD
+	 */
+	private function getDomainName() {
+		return 'https://www.amazon.' . $this->getInput('tld');
+	}
+
+	/**
+	 * Generates URI for a Amazon product page
+	 */
+	public function getURI() {
+		if (!is_null($this->getInput('asin'))) {
+			return $this->getDomainName() . '/dp/' . $this->getInput('asin') . '/';
+		}
+		return parent::getURI();
+	}
+
+	/**
+	 * Scrapes the product title from the html page
+	 * returns the default title if scraping fails
+	 */
+	private function getTitle($html) {
+		$titleTag = $html->find('#productTitle', 0);
+
+		if (!$titleTag) {
+			return $this->getDefaultTitle();
+		} else {
+			return trim(html_entity_decode($titleTag->innertext, ENT_QUOTES));
+		}
+	}
+
+	/**
+	 * Title used by the feed if none could be found
+	 */
+	private function getDefaultTitle() {
+		return 'Amazon.' . $this->getInput('tld') . ': ' . $this->getInput('asin');
+	}
+
+	/**
+	 * Returns name for the feed
+	 * Uses title (already scraped) if it has one
+	 */
+	public function getName() {
+		if (isset($this->title)) {
+			return $this->title;
+		} else {
+			return parent::getName();
+		}
+	}
+
+	/**
+	 * Returns a generated image tag for the product
+	 */
+	private function getImage($html) {
+		$imageSrc = $html->find('#main-image-container img', 0);
+
+		if ($imageSrc) {
+			$imageSrc = $imageSrc ? $imageSrc->getAttribute('data-old-hires') : '';
+			return <<<EOT
+<img width="300" style="max-width:300;max-height:300" src="$imageSrc" alt="{$this->title}" />
+EOT;
+		}
+	}
+
+	/**
+	 * Return \simple_html_dom object
+	 * for the entire html of the product page
+	 */
+	private function getHtml() {
+		$uri = $this->getURI();
+
+		return getSimpleHTMLDOM($uri) ?: returnServerError('Could not request Amazon.');
+	}
+
+	/**
+	 * Scrape method for Amazon product page
+	 * @return [type] [description]
+	 */
+	public function collectData() {
+		$html = $this->getHtml();
+		$this->title = $this->getTitle($html);
+		$imageTag = $this->getImage($html);
+
+		$asinData = $html->find('#cerberus-data-metrics', 0);
+
+		// <div id="cerberus-data-metrics" style="display: none;"
+		// 	data-asin="B00WTHJ5SU" data-asin-price="14.99" data-asin-shipping="0"
+		// 	data-asin-currency-code="USD" data-substitute-count="-1" ... />
+		$currency = $asinData->getAttribute('data-asin-currency-code');
+		$shipping = $asinData->getAttribute('data-asin-shipping');
+		$price    = $asinData->getAttribute('data-asin-price');
+
+		$item = array(
+			'title' 	=> $this->title,
+			'uri' 		=> $this->getURI(),
+			'content' 	=> "$imageTag<br/>Price: $price $currency",
+		);
+
+		if ($shipping !== '0') {
+			$item['content'] .= "<br>Shipping: $shipping $currency</br>";
+		}
+
+		$this->items[] = $item;
+	}
+}
diff --git a/bridges/ContainerLinuxReleasesBridge.php b/bridges/ContainerLinuxReleasesBridge.php
index ce3235ff..06c8ac40 100644
--- a/bridges/ContainerLinuxReleasesBridge.php
+++ b/bridges/ContainerLinuxReleasesBridge.php
@@ -1,7 +1,7 @@
 <?php
 class ContainerLinuxReleasesBridge extends BridgeAbstract {
 
-	const MAINTAINER = 'capt3m0';
+	const MAINTAINER = 'captn3m0';
 	const NAME = 'Core OS Container Linux Releases Bridge';
 	const URI = 'https://coreos.com/releases/';
 	const DESCRIPTION = 'Returns the releases notes for Container Linux';