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# frozen_string_literal: true
module Rack
# Rack::MediaType parse media type and parameters out of content_type string
class MediaType
SPLIT_PATTERN = /[;,]/
class << self
# The media type (type/subtype) portion of the CONTENT_TYPE header
# without any media type parameters. e.g., when CONTENT_TYPE is
# "text/plain;charset=utf-8", the media-type is "text/plain".
#
# For more information on the use of media types in HTTP, see:
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.7
def type(content_type)
return nil unless content_type
if type = content_type.split(SPLIT_PATTERN, 2).first
type.rstrip!
type.downcase!
type
end
end
# The media type parameters provided in CONTENT_TYPE as a Hash, or
# an empty Hash if no CONTENT_TYPE or media-type parameters were
# provided. e.g., when the CONTENT_TYPE is "text/plain;charset=utf-8",
# this method responds with the following Hash:
# { 'charset' => 'utf-8' }
def params(content_type)
return {} if content_type.nil?
content_type.split(SPLIT_PATTERN)[1..-1].each_with_object({}) do |s, hsh|
s.strip!
k, v = s.split('=', 2)
k.downcase!
hsh[k] = strip_doublequotes(v)
end
end
private
def strip_doublequotes(str)
(str.start_with?('"') && str.end_with?('"')) ? str[1..-2] : str
end
end
end
end
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