77 lines
2.0 KiB
Ruby
77 lines
2.0 KiB
Ruby
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module Zero
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class Request
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# encapsulates the accept header to easier work with
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# this is partly copied from sinatra
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class Accept
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MEDIA_TYPE_SEPERATOR = ','
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MEDIA_PARAM_SEPERATOR = ';'
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MEDIA_QUALITY_REGEX = /q=[01]\./
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def self.media_map(map)
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@@map = map
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end
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def self.map
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@@map ||= {}
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end
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# create a new accept object
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def initialize(accept_string)
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@types = parse_media_types(accept_string)
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end
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# return the preferred type
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# @return String the preferred media type
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def preferred
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@types.first
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end
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# iterate over all media types
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def each
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@types.each {|type| yield type}
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end
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private
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# converts the accept string to a useable array
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# @param accept_string the string containing media ranges and options
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def parse_media_types(accept_string = '*/*')
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accept_string.
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gsub(/\s/, '').
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split(MEDIA_TYPE_SEPERATOR).
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map do |accept_range|
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extract_order(*accept_range.split(MEDIA_PARAM_SEPERATOR))
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end.
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sort_by(&:last).
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map(&:first)
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end
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# extract the order of the type
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# @param media_type the type itself
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# @param params further options to the type
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# @return Array the media type and quality in that order
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def extract_order(media_type, *params)
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params.each do |param|
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if param.match(MEDIA_QUALITY_REGEX)
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return [map_type(media_type), 10 - param[4..-1].to_i]
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end
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end
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[map_type(media_type), 0]
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end
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# map media types to the type given in the map
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# @param type [String] the media type
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# @return the media type of the mapping or the original
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def map_type(type)
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return map[type] if map.has_key?(type)
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type
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end
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# a small wrapper to the class method
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def map
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self.class.map
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end
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end
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end
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end
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