# frozen_string_literal: true class CGI module Util; end include Util extend Util end module CGI::Util @@accept_charset="UTF-8" unless defined?(@@accept_charset) # URL-encode a string. # url_encoded_string = CGI.escape("'Stop!' said Fred") # # => "%27Stop%21%27+said+Fred" def escape(string) encoding = string.encoding string.b.gsub(/([^ a-zA-Z0-9_.\-~]+)/) do |m| '%' + m.unpack('H2' * m.bytesize).join('%').upcase end.tr(' ', '+').force_encoding(encoding) end # URL-decode a string with encoding(optional). # string = CGI.unescape("%27Stop%21%27+said+Fred") # # => "'Stop!' said Fred" def unescape(string,encoding=@@accept_charset) str=string.tr('+', ' ').b.gsub(/((?:%[0-9a-fA-F]{2})+)/) do |m| [m.delete('%')].pack('H*') end.force_encoding(encoding) str.valid_encoding? ? str : str.force_encoding(string.encoding) end # The set of special characters and their escaped values TABLE_FOR_ESCAPE_HTML__ = { "'" => ''', '&' => '&', '"' => '"', '<' => '<', '>' => '>', } # Escape special characters in HTML, namely '&\"<> # CGI.escapeHTML('Usage: foo "bar" ') # # => "Usage: foo "bar" <baz>" def escapeHTML(string) enc = string.encoding unless enc.ascii_compatible? if enc.dummy? origenc = enc enc = Encoding::Converter.asciicompat_encoding(enc) string = enc ? string.encode(enc) : string.b end table = Hash[TABLE_FOR_ESCAPE_HTML__.map {|pair|pair.map {|s|s.encode(enc)}}] string = string.gsub(/#{"['&\"<>]".encode(enc)}/, table) string.encode!(origenc) if origenc return string end string.gsub(/['&\"<>]/, TABLE_FOR_ESCAPE_HTML__) end begin require 'cgi/escape' rescue LoadError end # Unescape a string that has been HTML-escaped # CGI.unescapeHTML("Usage: foo "bar" <baz>") # # => "Usage: foo \"bar\" " def unescapeHTML(string) enc = string.encoding unless enc.ascii_compatible? if enc.dummy? origenc = enc enc = Encoding::Converter.asciicompat_encoding(enc) string = enc ? string.encode(enc) : string.b end string = string.gsub(Regexp.new('&(apos|amp|quot|gt|lt|#[0-9]+|#x[0-9A-Fa-f]+);'.encode(enc))) do case $1.encode(Encoding::US_ASCII) when 'apos' then "'".encode(enc) when 'amp' then '&'.encode(enc) when 'quot' then '"'.encode(enc) when 'gt' then '>'.encode(enc) when 'lt' then '<'.encode(enc) when /\A#0*(\d+)\z/ then $1.to_i.chr(enc) when /\A#x([0-9a-f]+)\z/i then $1.hex.chr(enc) end end string.encode!(origenc) if origenc return string end return string unless string.include? '&' charlimit = case enc when Encoding::UTF_8; 0x10ffff when Encoding::ISO_8859_1; 256 else 128 end string.gsub(/&(apos|amp|quot|gt|lt|\#[0-9]+|\#[xX][0-9A-Fa-f]+);/) do match = $1.dup case match when 'apos' then "'" when 'amp' then '&' when 'quot' then '"' when 'gt' then '>' when 'lt' then '<' when /\A#0*(\d+)\z/ n = $1.to_i if n < charlimit n.chr(enc) else "&##{$1};" end when /\A#x([0-9a-f]+)\z/i n = $1.hex if n < charlimit n.chr(enc) else "&#x#{$1};" end else "&#{match};" end end end # Synonym for CGI.escapeHTML(str) alias escape_html escapeHTML # Synonym for CGI.unescapeHTML(str) alias unescape_html unescapeHTML # Escape only the tags of certain HTML elements in +string+. # # Takes an element or elements or array of elements. Each element # is specified by the name of the element, without angle brackets. # This matches both the start and the end tag of that element. # The attribute list of the open tag will also be escaped (for # instance, the double-quotes surrounding attribute values). # # print CGI.escapeElement('
', "A", "IMG") # # "
<A HREF="url"></A>" # # print CGI.escapeElement('
', ["A", "IMG"]) # # "
<A HREF="url"></A>" def escapeElement(string, *elements) elements = elements[0] if elements[0].kind_of?(Array) unless elements.empty? string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do CGI.escapeHTML($&) end else string end end # Undo escaping such as that done by CGI.escapeElement() # # print CGI.unescapeElement( # CGI.escapeHTML('
'), "A", "IMG") # # "<BR>" # # print CGI.unescapeElement( # CGI.escapeHTML('
'), ["A", "IMG"]) # # "<BR>" def unescapeElement(string, *elements) elements = elements[0] if elements[0].kind_of?(Array) unless elements.empty? string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do unescapeHTML($&) end else string end end # Synonym for CGI.escapeElement(str) alias escape_element escapeElement # Synonym for CGI.unescapeElement(str) alias unescape_element unescapeElement # Abbreviated day-of-week names specified by RFC 822 RFC822_DAYS = %w[ Sun Mon Tue Wed Thu Fri Sat ] # Abbreviated month names specified by RFC 822 RFC822_MONTHS = %w[ Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ] # Format a +Time+ object as a String using the format specified by RFC 1123. # # CGI.rfc1123_date(Time.now) # # Sat, 01 Jan 2000 00:00:00 GMT def rfc1123_date(time) t = time.clone.gmtime return format("%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT", RFC822_DAYS[t.wday], t.day, RFC822_MONTHS[t.month-1], t.year, t.hour, t.min, t.sec) end # Prettify (indent) an HTML string. # # +string+ is the HTML string to indent. +shift+ is the indentation # unit to use; it defaults to two spaces. # # print CGI.pretty("") # # # # # # # # # # print CGI.pretty("", "\t") # # # # # # # # # def pretty(string, shift = " ") lines = string.gsub(/(?!\A)<.*?>/m, "\n\\0").gsub(/<.*?>(?!\n)/m, "\\0\n") end_pos = 0 while end_pos = lines.index(/^<\/(\w+)/, end_pos) element = $1.dup start_pos = lines.rindex(/^\s*<#{element}/i, end_pos) lines[start_pos ... end_pos] = "__" + lines[start_pos ... end_pos].gsub(/\n(?!\z)/, "\n" + shift) + "__" end lines.gsub(/^((?:#{Regexp::quote(shift)})*)__(?=<\/?\w)/, '\1') end alias h escapeHTML end