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# URI path and fragment escaping
# https://tools.ietf.org/html/rfc3986
# from actionpack/lib/action_dispatch/journey/router/utils.rb
class UriEncoder # :nodoc:
ENCODE = "%%%02X".freeze
US_ASCII = Encoding::US_ASCII
UTF_8 = Encoding::UTF_8
EMPTY = "".dup.force_encoding(US_ASCII).freeze
DEC2HEX = (0..255).to_a.map { |i| ENCODE % i }.map { |s| s.force_encoding(US_ASCII) }
ALPHA = "a-zA-Z".freeze
DIGIT = "0-9".freeze
UNRESERVED = "#{ALPHA}#{DIGIT}\\-\\._~".freeze
SUB_DELIMS = "!\\$&'\\(\\)\\*\\+,;=".freeze
ESCAPED = /%[a-zA-Z0-9]{2}/.freeze
FRAGMENT = /[^#{UNRESERVED}#{SUB_DELIMS}:@\/\?]/.freeze
SEGMENT = /[^#{UNRESERVED}#{SUB_DELIMS}:@]/.freeze
PATH = /[^#{UNRESERVED}#{SUB_DELIMS}:@\/]/.freeze
def self.escape_fragment(fragment)
self.escape(fragment, FRAGMENT)
end
def self.escape_path(path)
self.escape(path, PATH)
end
def self.escape_segment(segment)
self.escape(segment, SEGMENT)
end
def self.unescape(uri)
encoding = uri.encoding == US_ASCII ? UTF_8 : uri.encoding
uri.gsub(ESCAPED) { |match| [match[1, 2].hex].pack("C") }.force_encoding(encoding)
end
def self.escape(component, pattern)
component.gsub(pattern) { |unsafe| percent_encode(unsafe) }.force_encoding(US_ASCII)
end
private
def percent_encode(unsafe)
safe = EMPTY.dup
unsafe.each_byte { |b| safe << DEC2HEX[b] }
safe
end
end