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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| require 'aws/sig_v4' | ||
| require 'json' | ||
| require 'net/http' | ||
|
|
||
| module AWS | ||
| class PAAPI | ||
| Market = Struct.new(:host, :region) | ||
| MARKETS = { | ||
| au: Market.new('webservices.amazon.com.au', 'us-west-2'), | ||
| br: Market.new('webservices.amazon.com.br' 'us-east-1'), | ||
| ca: Market.new('webservices.amazon.ca', 'us-east-1'), | ||
| fr: Market.new('webservices.amazon.fr', 'eu-west-1'), | ||
| de: Market.new('webservices.amazon.de', 'eu-west-1'), | ||
| in: Market.new('webservices.amazon.in', 'eu-west-1'), | ||
| it: Market.new('webservices.amazon.it', 'eu-west-1'), | ||
| jp: Market.new('webservices.amazon.co.jp', 'us-west-2'), | ||
| mx: Market.new('webservices.amazon.com.mx', 'us-east-1'), | ||
| es: Market.new('webservices.amazon.es', 'eu-west-1'), | ||
| tr: Market.new('webservices.amazon.com.tr', 'eu-west-1'), | ||
| ae: Market.new('webservices.amazon.ae', 'eu-west-1'), | ||
| uk: Market.new('webservices.amazon.co.uk', 'eu-west-1'), | ||
| us: Market.new('webservices.amazon.com', 'us-east-1'), | ||
| }.freeze | ||
|
|
||
| def initialize(access_key, secret_key, partner_tag) | ||
| @access_key, @secret_key, @partner_tag = access_key, secret_key, partner_tag | ||
| end | ||
|
|
||
| def get_items(asin, locale) | ||
| payload = { | ||
| "PartnerTag" => @partner_tag, | ||
| "PartnerType" => "Associates", | ||
| "Marketplace" => MARKETS[locale].host.sub('webservices', 'www'), | ||
| "ItemIds" => [asin], | ||
| "Resources" => [ | ||
| "Images.Primary.Small", | ||
| "Images.Primary.Medium", | ||
| "Images.Primary.Large", | ||
| "ItemInfo.ByLineInfo", | ||
| "ItemInfo.Title", | ||
| "Offers.Listings.Price" | ||
| ] | ||
| }.to_json | ||
| time_stamp = Time.now.utc.strftime("%Y%m%dT%H%M%SZ") | ||
| signature = AWS::SigV4.signature(@secret_key, time_stamp, MARKETS[locale].region, MARKETS[locale].host, payload) | ||
| authorization = "AWS4-HMAC-SHA256 Credential=#{@access_key}/#{time_stamp[0,8]}/#{MARKETS[locale].region}/ProductAdvertisingAPI/aws4_request, SignedHeaders=content-encoding;host;x-amz-content-sha256;x-amz-date;x-amz-target, Signature=#{signature}" | ||
|
|
||
| headers = { | ||
| "X-Amz-Target" => "com.amazon.paapi5.v1.ProductAdvertisingAPIv1.GetItems", | ||
| "Content-Encoding" => "amz-1.0", | ||
| "Host" => MARKETS[locale].host, | ||
| "X-Amz-Date" => time_stamp, | ||
| "X-Amz-Content-Sha256" => OpenSSL::Digest::SHA256.hexdigest(payload), | ||
| "Authorization" => authorization, | ||
| "Content-Type" => "application/json; charset=utf-8" | ||
| } | ||
| uri = URI("https://#{MARKETS[locale].host}/paapi5/getitems") | ||
| http = Net::HTTP.new(uri.host, uri.port) | ||
| http.use_ssl = true | ||
| response = http.post(uri.path, payload, headers) | ||
| response.value # raise on errors | ||
| return response.body | ||
| end | ||
| end | ||
| end |
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| # | ||
| # A Simple impl of AWS Signature V4 for PA-API GetItems | ||
| # | ||
| require 'openssl' | ||
|
|
||
| module AWS | ||
| module SigV4 | ||
| def self.canonical_request(host, payload, time_stamp) | ||
| headers = { | ||
| 'Content-Encoding' => 'amz-1.0', | ||
| 'Host' => host, | ||
| 'X-Amz-Content-Sha256' => OpenSSL::Digest::SHA256.hexdigest(payload), | ||
| 'X-Amz-Date' => time_stamp, | ||
| 'X-Amz-Target' => "com.amazon.paapi5.v1.ProductAdvertisingAPIv1.GetItems", | ||
| } | ||
| [ | ||
| "POST", | ||
| "/paapi5/getitems", | ||
| '', | ||
| headers.keys.sort.map{|k|"#{k.downcase}:#{headers[k]}"}.join("\n") + "\n", | ||
| headers.keys.sort.map{|k|k.downcase}.join(';'), | ||
| OpenSSL::Digest::SHA256.hexdigest(payload) | ||
| ].join("\n") | ||
| end | ||
| def self.string2sign(host, payload, time_stamp) | ||
| [ | ||
| 'AWS4-HMAC-SHA256', | ||
| time_stamp, | ||
| "#{time_stamp[0,8]}/us-west-2/ProductAdvertisingAPI/aws4_request", | ||
| OpenSSL::Digest::SHA256.hexdigest(canonical_request(host, payload, time_stamp)) | ||
| ].join("\n") | ||
| end | ||
| def self.signature(secret, time_stamp, region, host, payload) | ||
| k_secret = secret | ||
| k_date = hmac("AWS4" + k_secret, time_stamp[0,8]) | ||
| k_region = hmac(k_date, region) | ||
| k_service = hmac(k_region, 'ProductAdvertisingAPI') | ||
| k_credential = hmac(k_service, "aws4_request") | ||
| OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha256'), k_credential, string2sign(host, payload, time_stamp)) | ||
| end | ||
| def self.hmac(key, value) | ||
| OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha256'), key, value) | ||
| end | ||
| end | ||
| end |
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