Move to using Amazon Signer, rather than reimplementing.

Gemfile.lock

@@ -2,27 +2,33 @@ PATH
   remote: .
   specs:
     aws_paa (0.1.0)
-      rest-client (~> 2.0)
+      aws-sigv4 (~> 1)
+      http (~> 0.1)
 
 GEM
   remote: https://rubygems.org/
   specs:
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    awesome_print (1.8.0)
+    aws-eventstream (1.0.3)
+    aws-sigv4 (1.1.0)
+      aws-eventstream (~> 1.0, >= 1.0.2)
+    byebug (11.0.1)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
-    http-accept (1.7.0)
+    http (0.9.9)
+      addressable (~> 2.3)
+      http-cookie (~> 1.0)
+      http-form_data (~> 1.0.1)
+      http_parser.rb (~> 0.6.0)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
-    mime-types (3.2.2)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2019.0331)
+    http-form_data (1.0.3)
+    http_parser.rb (0.6.0)
     minitest (5.11.3)
-    netrc (0.11.0)
+    public_suffix (4.0.1)
     rake (10.5.0)
-    rest-client (2.1.0)
-      http-accept (>= 1.7.0, < 2.0)
-      http-cookie (>= 1.0.2, < 2.0)
-      mime-types (>= 1.16, < 4.0)
-      netrc (~> 0.8)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.6)
@@ -31,8 +37,10 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  awesome_print
   aws_paa!
   bundler (~> 2.0)
+  byebug
   minitest (~> 5.0)
   rake (~> 10.0)
 

aws_paa.gemspec

@@ -8,7 +8,7 @@ Gem::Specification.new do |spec|
   spec.authors       = ["Dan Milne"]
   spec.email         = ["d@nmilne.com"]
 
-  spec.summary       = %q{Ruby API for Amazon's Product Advertising API v5}
+  spec.summary       = %q{Client library for Amazon's Product Advertising API v5}
   spec.homepage      = "https://github.com/dkam/aws_paa"
   spec.license       = "MIT"
 
@@ -30,6 +30,9 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 2.0"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
+  spec.add_development_dependency "byebug"
+  spec.add_development_dependency "awesome_print"
 
-  spec.add_dependency 'httprb', '~> 0.1'
+  spec.add_dependency 'http', '~> 0.1'
+  spec.add_dependency 'aws-sigv4', '~> 1'
 end

lib/aws_paa.rb

@@ -1,5 +1,7 @@
 require "aws_paa/version"
 
+require 'aws_paa/locales'
+require 'aws_paa/aws_request'
 require 'aws_paa/client'
 require 'aws_paa/request'
 require 'aws_paa/response'
@@ -7,5 +9,4 @@ require 'aws_paa/response'
 module AwsPaa
   class Error < StandardError; end
   class NotImplemented < StandardError; end
-  # Your code goes here...
 end

lib/aws_paa/client.rb

@@ -1,8 +1,33 @@
-require 'rest-client'
+require 'http'
 
 module AwsPaa
   class Client
-    def initialize(:access_key, :secret_key, :marketplace, partner_tag: nil, partner_type: 'Associates')
+    attr_accessor :marketplace, :partner_tag
+    attr_reader :partner_type, :access_key, :secret_key
+
+    def initialize(access_key:, secret_key:, marketplace:, partner_tag: nil, partner_type: 'Associates')
+      raise ArgumentError unless MARKETPLACES.keys.include?(marketplace.to_sym)
+      @access_key = access_key
+      @secret_key = secret_key
+      @marketplace = MARKETPLACES[marketplace.to_sym]
+      @partner_tag = partner_tag
+      @partner_type = partner_type
+    end
+
+    def get_items(item_ids: )[]
+      Request.new(client: self).get_items(item_ids: item_ids)
+    end
+
+    def get_variations(asin: )
+      Request.new(client: self).get_variations(asin: asin)
+    end
+
+    def search_items(keywords: )
+      Request.new(client: self).search_items(keywords: keywords)
+    end
+
+    def get_browse_nodes
+      Request.new(client: self).get_browse_nodes(keywords: keywords)
     end
   end
-end
+end

lib/aws_paa/request.rb

@@ -1,43 +1,48 @@
-
+require 'byebug'
 
 module AwsPaa
   class Request
-    def initialize()
-      @request_example = {
-        "Keywords": "Harry",
-        "Marketplace": "www.amazon.com",
-        "PartnerTag": "xyz-20",
-        "PartnerType": "Associates",
-        "Resources": ["Images.Primary.Small","ItemInfo.Title","Offers.Listings.Price"],
-        "SearchIndex": "All"
-      }
+    include AwsRequest
+    attr_accessor :client, :marketplace, :timestamp, :datestamp, :amzstamp, :resources, :service
+    attr_accessor :headers, :payload
 
-      @headers = {
-        'host' => 'webservices.amazon.com',
-        'content-type' => 'application/json; charset=utf-8',
-        'content-encoding' => 'amz-1.0',
-        'x-amz-date' => '20160925T120000Z',
-        'x-amz-target' => 'com.amazon.paapi5.v1.ProductAdvertisingAPIv1.SearchItems',
-        'Authorization' => 'AWS4-HMAC-SHA256 Credential=AKIAIOSFODNN7EXAMPLE, SignedHeaders=content-type;host;x-amz-date;x-amz-target, Signature=&5d672d79c15b13162d9279b0855cfba6789a8edb4c82c400e06b5924a6f2b5d7;'
-      }
+    def initialize(client:)
+      @client      = client
+      @marketplace = client.marketplace
+      @partner_tag = client.partner_tag
+      @partner_type = 'Associates'
 
-      @marketplaces = [www.amazon.com]
+      @resources   = [
+        "Images.Primary.Large",
+        "ItemInfo.ContentInfo",
+        "ItemInfo.ProductInfo",
+        "ItemInfo.Title",
+        "ItemInfo.ExternalIds",
+      ]
+    end
+
+    def get_items(item_ids:,  **options)
+      item_ids = Array(item_ids)
+
+      payload = { ItemIds: item_ids, Resources:  @resources }
+
+      do_request(op: :get_items, payload: payload)
+    end
+
+    def get_variations(asin:)
+      payload = { ASIN: asin, Resources:  @resources }
+
+      do_request(op: :get_variations, payload: payload)
+    end
+
+    def search_items(keywords: )
+      payload = { Keywords: keywords, Resources:  @resources }
+
+      do_request(op: :search_items, payload: payload)
     end
 
     def get_browse_nodes
       raise NotImplemented
     end
-
-    def get_items
-      raise NotImplemented
-    end
-    
-    def get_variations
-      raise NotImplemented
-    end
-    
-    def search_items
-      raise NotImplemented
-    end
   end
 end

test/test_helper.rb

@@ -1,4 +1,4 @@
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
 require "aws_paa"
-
+require 'byebug'
 require "minitest/autorun"