cyberhobo · December 19, 2016 23:09 · Dec 19, 2016
diff --git a/freemius-api-client.rb b/freemius-api-client.rb
@@ -0,0 +1,83 @@
+module Freemius
+  API_HOST = 'api.freemius.com'
+  SANDBOX_HOST = 'sandbox-api.freemius.com'
+
+  class Base
+    # Options taken from http://docs.freemius.apiary.io/#introduction/the-authentication-header
+    # * host                 Default is api.freemius.com
+    # * api_version          Default is v1
+    # * scope_entity         Default is 'plugin'. Could also be 'developer', 'install', 'site', 'user'
+    # * scope_entity_id      Required.
+    # * public_key           Required.
+    # * secret_key           Required.
+    def initialize(options)
+      Freemius.host         = options.fetch(:host)             { API_HOST }
+      Freemius.api_version  = options.fetch(:api_version)      { 'v1' }
+      Freemius.scope_entity = options.fetch(:scope_entity)     { 'plugin' }
+      Freemius.scope_entity_id  = options.fetch(:scope_entity_id) do 
+        raise ArgumentError.new('Scope entity ID is required to initialize Freemius') if Freemius.scope_entity_id.nil?
+      end
+      Freemius.public_key  = options.fetch(:public_key) do 
+        raise ArgumentError.new('Public key is required to initialize Freemius') if Freemius.public_key.nil?
+      end
+      Freemius.secret_key  = options.fetch(:secret_key) do 
+        raise ArgumentError.new('Secret key is required to initialize Freemius') if Freemius.secret_key.nil?
+      end
+    end
+
+    def base_url
+      "https://#{Freemius.host}#{base_path}"
+    end
+
+    def base_path
+      "/#{Freemius.api_version}/#{Freemius.scope_entity.pluralize}/#{Freemius.scope_entity_id}"
+    end
+
+    def submit(method, path, data = {})
+      body = [:put, :post].include?(method) ? data.to_json : ''
+      headers = headers(method, "#{base_path}/#{path.split('?').first}", body)
+      response = http_client.run_request(method, path, body, headers)
+      JSON.parse(response.body)
+    end
+
+    private
+
+      def http_client
+        @http_client ||= Faraday.new(base_url, :ssl => { :ca_file => ENV['CERT_PATH'], :version => :TLSv1 }) 
+      end
+
+      def headers(method, path, body)
+        formatted_date = Time.now.strftime('%a, %e %b %Y %H:%M:%S %z')
+        content_type = 'application/json'
+        md5 = body.empty? ? '' : Digest::MD5.hexdigest(body)
+        signature_content = "#{method.to_s.upcase}\n#{md5}\n#{content_type}\n#{formatted_date}\n#{path}"
+        digest = OpenSSL::Digest.new('sha256')
+        signature = base64_url_encode(OpenSSL::HMAC.hexdigest(digest, Freemius.secret_key, signature_content))
+        { 
+          'Authorization' => "FS #{Freemius.scope_entity_id}:#{Freemius.public_key}:#{signature}",
+          'Content-Type' => content_type,
+          'Date' => formatted_date
+        }
+      end
+
+      def base64_url_encode(data)
+        Base64::encode64( data ).tr('+/', '-_').gsub('=', '').gsub("\n", '')
+      end
+
+  end
+
+  class << self
+    attr_accessor :host,
+                  :scope_entity,
+                  :scope_entity_id,
+                  :public_key,
+                  :secret_key,
+                  :api_version
+
+    def configure
+      yield self
+      true
+    end
+    alias :config :configure
+  end
+end
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