Add ErrorObject to StripeError exceptions

lib/stripe.rb

@@ -34,6 +34,7 @@
 require "stripe/stripe_object"
 require "stripe/stripe_response"
 require "stripe/list_object"
+require "stripe/error_object"
 require "stripe/api_resource"
 require "stripe/singleton_api_resource"
 require "stripe/webhook"

lib/stripe/error_object.rb

@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+
+module Stripe
+  # Represents an error object as returned by the API.
+  #
+  # @see https://stripe.com/docs/api/errors
+  class ErrorObject < StripeObject
+    # Unlike other objects, we explicitly declare getter methods here. This
+    # is because the API doesn't return `null` values for fields on this
+    # object, rather the fields are omitted entirely. Not declaring the getter
+    # methods would cause users to run into `NoMethodError` exceptions and
+    # get in the way of generic error handling.
+
+    # For card errors, the ID of the failed charge.
+    def charge
+      @values[:charge]
+    end
+
+    # For some errors that could be handled programmatically, a short string
+    # indicating the error code reported.
+    def code
+      @values[:code]
+    end
+
+    # For card errors resulting from a card issuer decline, a short string
+    # indicating the card issuer's reason for the decline if they provide one.
+    def decline_code
+      @values[:decline_code]
+    end
+
+    # A URL to more information about the error code reported.
+    def doc_url
+      @values[:doc_url]
+    end
+
+    # A human-readable message providing more details about the error. For card
+    # errors, these messages can be shown to your users.
+    def message
+      @values[:message]
+    end
+
+    # If the error is parameter-specific, the parameter related to the error.
+    # For example, you can use this to display a message near the correct form
+    # field.
+    def param
+      @values[:param]
+    end
+
+    # The PaymentIntent object for errors returned on a request involving a
+    # PaymentIntent.
+    def payment_intent
+      @values[:payment_intent]
+    end
+
+    # The PaymentMethod object for errors returned on a request involving a
+    # PaymentMethod.
+    def payment_method
+      @values[:payment_method]
+    end
+
+    # The SetupIntent object for errors returned on a request involving a
+    # SetupIntent.
+    def setup_intent
+      @values[:setup_intent]
+    end
+
+    # The source object for errors returned on a request involving a source.
+    def source
+      @values[:source]
+    end
+
+    # The type of error returned. One of `api_connection_error`, `api_error`,
+    # `authentication_error`, `card_error`, `idempotency_error`,
+    # `invalid_request_error`, or `rate_limit_error`.
+    def type
+      @values[:type]
+    end
+  end
+
+  # Represents on OAuth error returned by the OAuth API.
+  #
+  # @see https://stripe.com/docs/connect/oauth-reference#post-token-errors
+  class OAuthErrorObject < StripeObject
+    # A unique error code per error type.
+    def error
+      @values[:error]
+    end
+
+    # A human readable description of the error.
+    def error_description
+      @values[:error_description]
+    end
+  end
+end

lib/stripe/errors.rb

@@ -11,6 +11,7 @@ class StripeError < StandardError
     attr_accessor :response
 
     attr_reader :code
+    attr_reader :error
     attr_reader :http_body
     attr_reader :http_headers
     attr_reader :http_status
@@ -27,6 +28,13 @@ def initialize(message = nil, http_status: nil, http_body: nil,
       @json_body = json_body
       @code = code
       @request_id = @http_headers[:request_id]
+      @error = construct_error_object
+    end
+
+    def construct_error_object
+      return nil if @json_body.nil? || !@json_body.key?(:error)\
+
+      ErrorObject.construct_from(@json_body[:error])
     end
 
     def to_s
@@ -118,6 +126,12 @@ def initialize(code, description, http_status: nil, http_body: nil,
                            json_body: json_body, http_headers: http_headers,
                            code: code)
       end
+
+      def construct_error_object
+        return nil if @json_body.nil?
+
+        OAuthErrorObject.construct_from(@json_body)
+      end
     end
 
     # InvalidClientError is raised when the client doesn't belong to you, or

test/stripe/errors_test.rb

@@ -4,16 +4,37 @@
 
 module Stripe
   class StripeErrorTest < Test::Unit::TestCase
-    context "#to_s" do
-      should "convert to string" do
-        e = StripeError.new("message")
-        assert_equal "message", e.to_s
+    context "StripeError" do
+      context "#initialize" do
+        should "initialize error if json_body is set" do
+          e = StripeError.new("message", json_body: { error: { code: "some_error" } })
+          assert_not_nil e.error
+          assert_equal "some_error", e.error.code
+          assert_nil e.error.charge
+        end
+      end
+
+      context "#to_s" do
+        should "convert to string" do
+          e = StripeError.new("message")
+          assert_equal "message", e.to_s
+
+          e = StripeError.new("message", http_status: 200)
+          assert_equal "(Status 200) message", e.to_s
 
-        e = StripeError.new("message", http_status: 200)
-        assert_equal "(Status 200) message", e.to_s
+          e = StripeError.new("message", http_status: nil, http_body: nil, json_body: nil, http_headers: { request_id: "request-id" })
+          assert_equal "(Request request-id) message", e.to_s
+        end
+      end
+    end
 
-        e = StripeError.new("message", http_status: nil, http_body: nil, json_body: nil, http_headers: { request_id: "request-id" })
-        assert_equal "(Request request-id) message", e.to_s
+    context "OAuth::OAuthError" do
+      context "#initialize" do
+        should "initialize error if json_body is set" do
+          e = OAuth::OAuthError.new("message", "description", json_body: { error: "some_oauth_error" })
+          assert_not_nil e.error
+          assert_equal "some_oauth_error", e.error.error
+        end
       end
     end
   end