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module Paperclip
module Shoulda
module Matchers
# Ensures that the given instance or class validates the content type of
# the given attachment as specified.
#
# Example:
# describe User do
# it { should validate_attachment_content_type(:icon).
# allowing('image/png', 'image/gif').
# rejecting('text/plain', 'text/xml') }
# end
def validate_attachment_content_type name
ValidateAttachmentContentTypeMatcher.new(name)
end
class ValidateAttachmentContentTypeMatcher
def initialize attachment_name
@attachment_name = attachment_name
@allowed_types = []
@rejected_types = []
end
def allowing *types
@allowed_types = types.flatten
self
end
def rejecting *types
@rejected_types = types.flatten
self
end
def matches? subject
@subject = subject
@subject = @subject.new if @subject.class == Class
@allowed_types && @rejected_types &&
allowed_types_allowed? && rejected_types_rejected?
end
def failure_message
"#{expected_attachment}\n".tap do |message|
message << accepted_types_and_failures
message << "\n\n" if @allowed_types.present? && @rejected_types.present?
message << rejected_types_and_failures
end
end
def description
"validate the content types allowed on attachment #{@attachment_name}"
end
protected
def accepted_types_and_failures
if @allowed_types.present?
"Accept content types: #{@allowed_types.join(", ")}\n".tap do |message|
if @missing_allowed_types.any?
message << " #{@missing_allowed_types.join(", ")} were rejected."
else
message << " All were accepted successfully."
end
end
end
end
def rejected_types_and_failures
if @rejected_types.present?
"Reject content types: #{@rejected_types.join(", ")}\n".tap do |message|
if @missing_rejected_types.any?
message << " #{@missing_rejected_types.join(", ")} were accepted."
else
message << " All were rejected successfully."
end
end
end
end
def expected_attachment
"Expected #{@attachment_name}:\n"
end
def type_allowed?(type)
@subject.send("#{@attachment_name}_content_type=", type)
@subject.valid?
@subject.errors[:"#{@attachment_name}_content_type"].blank?
end
def allowed_types_allowed?
@missing_allowed_types ||= @allowed_types.reject { |type| type_allowed?(type) }
@missing_allowed_types.none?
end
def rejected_types_rejected?
@missing_rejected_types ||= @rejected_types.select { |type| type_allowed?(type) }
@missing_rejected_types.none?
end
end
end
end
end
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