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module Rack::Accept
# Represents an HTTP Accept header according to the HTTP 1.1 specification,
# and provides several convenience methods for determining acceptable media
# types.
#
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
class MediaType
include Header
# The name of this header.
def name
'Accept'
end
# Determines the quality factor (qvalue) of the given +media_type+.
def qvalue(media_type)
return 1 if @qvalues.empty?
m = matches(media_type)
return 0 if m.empty?
normalize_qvalue(@qvalues[m.first])
end
# Returns an array of media types from this header that match the given
# +media_type+, ordered by precedence.
def matches(media_type)
type, subtype, params = parse_media_type(media_type)
values.select {|v|
if v == media_type || v == '*/*'
true
else
t, s, p = parse_media_type(v)
t == type && (s == '*' || s == subtype) && (p == '' || params_match?(params, p))
end
}.sort_by {|v|
# Most specific gets precedence.
v.length
}.reverse
end
private
def initialize(header)
# Strip accept-extension for now. We may want to do something with this
# later if people actually start to use it.
header = header.to_s.split(/,\s*/).map {|part|
part.sub(/(;\s*q\s*=\s*[\d.]+).*$/, '\1')
}.join(', ')
super(header)
end
# Returns true if all parameters and values in +match+ are also present in
# +params+.
def params_match?(params, match)
return true if params == match
parsed = parse_range_params(params)
parsed == parsed.merge(parse_range_params(match))
end
end
end
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