Define subclass of Goliath::Validation::Error for each standard HTTP …

…error code (4xx and 5xx): Goliath::Validation::NotFoundError, Goliath::Validation::GatewayTimeoutError, and so forth.

lib/goliath/validation/standard_http_errors.rb

@@ -0,0 +1,23 @@
+module Goliath
+  #
+  # Make a subclass of Goliath::Validation::Error for each standard HTTP error
+  # code (4xx and 5xx). Error will have a default status_code and message
+  # correct for that response:
+  #
+  #     err = Goliath::Validation::NotFoundError.new
+  #     p [err.status_code, err.to_s]
+  #     # => [400, "Not Found"]
+  #
+  # Each class is named for the standard HTTP message, so 504 'Gateway Time-out'
+  # becomes a Goliath::Validation::GatewayTimeoutError. All non-alphanumeric
+  # characters are smushed together, with no upcasing or downcasing.
+  #
+
+  HTTP_ERROR_CODES = HTTP_STATUS_CODES.select{|code,msg| code >= 400 && code <= 599 }
+  HTTP_ERROR_CODES.each do |code, msg|
+    klass_name = msg.gsub(/\W+/, '')+'Error'
+    klass = Class.new(Goliath::Validation::Error)
+    klass.class_eval %Q{def initialize(status_code='#{code}', message='#{msg}') super(status_code, message) ; end }, __FILE__, __LINE__
+    Goliath::Validation.const_set klass_name, klass
+  end
+end

spec/unit/validation/standard_http_errors_spec.rb

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+require 'spec_helper'
+require 'goliath/rack/validation_error'
+require 'goliath/validation/standard_http_errors'
+
+describe Goliath::Validation::Error do
+  it 'defines exceptions for each standard error response' do
+    lambda { Goliath::Validation::BadRequestError.new }.should_not raise_error
+    Goliath::Validation::BadRequestError.should < Goliath::Validation::Error
+  end
+
+  it 'sets a default status code and message' do
+    Goliath::Validation::NotFoundError.new.status_code.should == '404'
+    Goliath::Validation::NotFoundError.new.message.should == 'Not Found'
+  end
+end
+