discourse/lib/onebox/engine/amazon_onebox.rb

230 lines
8.2 KiB
Ruby

# frozen_string_literal: true
require 'json'
require "onebox/open_graph"
module Onebox
module Engine
class AmazonOnebox
include Engine
include LayoutSupport
include HTML
always_https
matches_regexp(/^https?:\/\/(?:www\.)?(?:smile\.)?(amazon|amzn)\.(?<tld>com|ca|de|it|es|fr|co\.jp|co\.uk|cn|in|com\.br|com\.mx|nl|pl|sa|sg|se|com\.tr|ae)\//)
def url
@raw ||= nil
# If possible, fetch the cached HTML body immediately so we can
# try to grab the canonical URL from that document,
# rather than guess at the best URL structure to use
if !@raw && has_cached_body
@raw = Onebox::Helpers.fetch_html_doc(@url, http_params, body_cacher)
end
if @raw
canonical_link = @raw.at('//link[@rel="canonical"]/@href')
return canonical_link.to_s if canonical_link
end
if match && match[:id]
id = Addressable::URI.encode_component(match[:id], Addressable::URI::CharacterClasses::PATH)
return "https://www.amazon.#{tld}/dp/#{id}"
end
@url
end
def tld
@tld ||= @@matcher.match(@url)["tld"]
end
def http_params
if @options && @options[:user_agent]
{ 'User-Agent' => @options[:user_agent] }
end
end
def to_html(ignore_errors = false)
unless ignore_errors
verified_data # forces a check for missing fields
return '' unless errors.empty?
end
super()
end
def placeholder_html
to_html(true)
end
def verified_data
@verified_data ||= begin
result = data
required_tags = [:title, :description]
required_tags.each do |tag|
if result[tag].blank?
errors[tag] ||= []
errors[tag] << 'is blank'
end
end
result
end
@verified_data
end
private
def has_cached_body
body_cacher&.respond_to?('cache_response_body?') &&
body_cacher.cache_response_body?(uri.to_s) &&
body_cacher.cached_response_body_exists?(uri.to_s)
end
def match
@match ||= @url.match(/(?:d|g)p\/(?:product\/|video\/detail\/)?(?<id>[A-Z0-9]+)(?:\/|\?|$)/mi)
end
def image
if (main_image = raw.css("#main-image")) && main_image.any?
attributes = main_image.first.attributes
if attributes["data-a-hires"]
return attributes["data-a-hires"].to_s
elsif attributes["data-a-dynamic-image"]
return ::JSON.parse(attributes["data-a-dynamic-image"].value).keys.first
end
end
if (landing_image = raw.css("#landingImage")) && landing_image.any?
attributes = landing_image.first.attributes
if attributes["data-old-hires"]
return attributes["data-old-hires"].to_s
else
return landing_image.first["src"].to_s
end
end
if (ebook_image = raw.css("#ebooksImgBlkFront")) && ebook_image.any?
::JSON.parse(ebook_image.first.attributes["data-a-dynamic-image"].value).keys.first
end
end
def price
# get item price (Amazon markup is inconsistent, deal with it)
if raw.css("#priceblock_ourprice .restOfPrice")[0] && raw.css("#priceblock_ourprice .restOfPrice")[0].inner_text
"#{raw.css("#priceblock_ourprice .restOfPrice")[0].inner_text}#{raw.css("#priceblock_ourprice .buyingPrice")[0].inner_text}.#{raw.css("#priceblock_ourprice .restOfPrice")[1].inner_text}"
elsif raw.css("#priceblock_dealprice") && (dealprice = raw.css("#priceblock_dealprice span")[0])
dealprice.inner_text
elsif !raw.css("#priceblock_ourprice").inner_text.empty?
raw.css("#priceblock_ourprice").inner_text
else
raw.css(".mediaMatrixListItem.a-active .a-color-price").inner_text
end
end
def multiple_authors(authors_xpath)
raw
.xpath(authors_xpath)
.map { |a| a.inner_text.strip }
.join(", ")
end
def data
og = ::Onebox::OpenGraph.new(raw)
if raw.at_css('#dp.book_mobile') # printed books
title = raw.at("h1#title")&.inner_text
authors = raw.at_css('#byline_secondary_view_div') ? multiple_authors("//div[@id='byline_secondary_view_div']//span[@class='a-text-bold']") : raw.at("#byline")&.inner_text
rating = raw.at("#averageCustomerReviews_feature_div .a-icon")&.inner_text || raw.at("#cmrsArcLink .a-icon")&.inner_text
table_xpath = "//div[@id='productDetails_secondary_view_div']//table[@id='productDetails_techSpec_section_1']"
isbn = raw.xpath("#{table_xpath}//tr[8]//td").inner_text.strip
# if ISBN is misplaced or absent it's hard to find out which data is
# available and where to find it so just set it all to nil
if /^\d(\-?\d){12}$/.match(isbn)
publisher = raw.xpath("#{table_xpath}//tr[1]//td").inner_text.strip
published = raw.xpath("#{table_xpath}//tr[2]//td").inner_text.strip
book_length = raw.xpath("#{table_xpath}//tr[6]//td").inner_text.strip
else
isbn = publisher = published = book_length = nil
end
result = {
link: url,
title: title,
by_info: authors,
image: og.image || image,
description: raw.at("#productDescription")&.inner_text,
rating: "#{rating}#{', ' if rating && (!isbn&.empty? || !price&.empty?)}",
price: price,
isbn_asin_text: "ISBN",
isbn_asin: isbn,
publisher: publisher,
published: "#{published}#{', ' if published && !price&.empty?}"
}
elsif raw.at_css('#dp.ebooks_mobile') # ebooks
title = raw.at("#ebooksTitle")&.inner_text
authors = raw.at_css('#a-popover-mobile-udp-contributor-popover-id') ? multiple_authors("//div[@id='a-popover-mobile-udp-contributor-popover-id']//span[contains(@class,'a-text-bold')]") : (raw.at("#byline")&.inner_text&.strip || raw.at("#bylineInfo")&.inner_text&.strip)
rating = raw.at("#averageCustomerReviews_feature_div .a-icon")&.inner_text || raw.at("#cmrsArcLink .a-icon")&.inner_text || raw.at("#acrCustomerReviewLink .a-icon")&.inner_text
table_xpath = "//div[@id='detailBullets_secondary_view_div']//ul"
asin = raw.xpath("#{table_xpath}//li[4]/span/span[2]").inner_text
# if ASIN is misplaced or absent it's hard to find out which data is
# available and where to find it so just set it all to nil
if /^[0-9A-Z]{10}$/.match(asin)
publisher = raw.xpath("#{table_xpath}//li[2]/span/span[2]").inner_text
published = raw.xpath("#{table_xpath}//li[1]/span/span[2]").inner_text
else
asin = publisher = published = nil
end
result = {
link: url,
title: title,
by_info: authors,
image: og.image || image,
description: raw.at("#productDescription")&.inner_text,
rating: "#{rating}#{', ' if rating && (!asin&.empty? || !price&.empty?)}",
price: price,
isbn_asin_text: "ASIN",
isbn_asin: asin,
publisher: publisher,
published: "#{published}#{', ' if published && !price&.empty?}"
}
else
title = og.title || CGI.unescapeHTML(raw.css("title").inner_text)
result = {
link: url,
title: title,
image: og.image || image,
price: price
}
result[:by_info] = raw.at("#by-line")
result[:by_info] = Onebox::Helpers.clean(result[:by_info].inner_html) if result[:by_info]
summary = raw.at("#productDescription")
description = og.description || summary&.inner_text
description ||= raw.css("meta[name=description]").first&.[]("content")
result[:description] = CGI.unescapeHTML(Onebox::Helpers.truncate(description, 250)) if description
end
result[:price] = nil if result[:price].start_with?("$0") || result[:price] == 0
result
end
end
end
end