Expose middleware stack for configuration

lib/tacokit/client.rb

@@ -48,8 +48,6 @@ class Client
     include Tacokit::Client::Webhooks
 
     def_delegators :configuration, *Configuration.keys
-    def_delegators :configuration, :user_authenticated?, :user_credentials
-    def_delegators :configuration, :app_authenticated?, :app_credentials
     def_delegators :transform, :serialize, :deserialize, :serialize_params
 
     attr_accessor :last_response
@@ -117,25 +115,21 @@ def transform
       @transform ||= Transform.new
     end
 
-    def connection
-      @connection ||= Faraday.new(url: api_endpoint) do |http|
-        http.headers[:user_agent] = "TacoKit 0.0.1"
+    def connection_options
+      {
+        url: api_endpoint,
+        builder: configuration.stack,
+        headers: { user_agent: "Tacokit #{Tacokit::VERSION}" }
+      }
+    end
 
-        if user_authenticated?
-          http.request :oauth, user_credentials
-        elsif app_authenticated?
-          http.params.update app_credentials
+    def connection
+      @connection ||= Faraday.new(connection_options) do |http|
+        if configuration.user_authenticated?
+          http.request :oauth, configuration.user_credentials
+        elsif configuration.app_authenticated?
+          http.params.update configuration.app_credentials
         end
-
-        http.request :json
-        http.request :multipart
-        http.request :url_encoded
-
-        http.response :json, content_type: /\bjson$/
-        http.response :raise_error
-        http.response :logger if ENV["DEBUG"]
-
-        http.adapter Faraday.default_adapter
       end
     end
   end

lib/tacokit/configuration.rb

@@ -13,7 +13,8 @@ def self.keys
         :oauth_token,
         :oauth_secret,
         :api_endpoint,
-        :web_endpoint
+        :web_endpoint,
+        :stack
       ]
     end
 
@@ -43,6 +44,12 @@ def app_credentials
       { key: app_key, token: app_token }.delete_if { |k, v| v.nil? }
     end
 
+    def stack
+      @stack ||= Faraday::RackBuilder.new(&Middleware.default_stack(self))
+      yield @stack if block_given?
+      @stack
+    end
+
     private
 
     def defaults

lib/tacokit/middleware.rb

@@ -3,5 +3,21 @@
 module Tacokit
   module Middleware
     Faraday::Response.register_middleware raise_error: -> { Tacokit::Middleware::RaiseError }
+
+    module_function
+
+    def default_stack(config = Tacokit.configuration)
+      proc do |http|
+        http.request :json
+        http.request :multipart
+        http.request :url_encoded
+
+        http.response :json, content_type: /\bjson$/
+        http.response :raise_error
+        http.response :logger if ENV["DEBUG"]
+
+        http.adapter Faraday.default_adapter
+      end
+    end
   end
 end

spec/spec_helper.rb

@@ -10,6 +10,7 @@
 require "tacokit"
 require "rspec"
 require "webmock/rspec"
+require "pry"
 
 WebMock.disable_net_connect!
 

spec/tacokit/configuration_spec.rb

@@ -33,6 +33,30 @@
     expect(configuration.app_secret).to eq("app_secret")
   end
 
+  it "exposes middleware stack" do
+    handlers = configuration.stack.handlers
+    expect(handlers.size).to eq(6)
+    [FaradayMiddleware::EncodeJson,
+     Faraday::Request::Multipart,
+     Faraday::Request::UrlEncoded,
+     FaradayMiddleware::ParseJson,
+     Tacokit::Middleware::RaiseError,
+     Faraday::Adapter::NetHttp].each do |middleware|
+      expect(handlers).to include(middleware), "handlers did not include #{middleware}"
+     end
+  end
+
+  it "has configurable middleware stack" do
+    test_middleware = Class.new(Faraday::Middleware)
+
+    configuration.stack do |conn|
+      conn.use test_middleware
+    end
+
+    expect(configuration.stack.handlers.size).to eq(7)
+    expect(configuration.stack.handlers.last).to eq(test_middleware)
+  end
+
   describe "#initialize" do
     it "sets key attributes provided as a hash" do
       configuration = Tacokit::Configuration.new \