对于我的网络服务器的传入请求,我得到s =“%u041D%u0430%u0434%u043E%u0435%u043B”等参数。
如何将此解码为Rails中的普通UTF8字符串? 谢谢!
答案 0 :(得分:1)
看起来像non-standard format produced by escape
in JavaScript。如果您可以影响发送此数据的代码,您应该尝试安排它使用encodeURI
代替(这会产生UTF-8编码字符的“正常”百分比编码)。
# Unescape percent encoding.
#
# The normal byte-oriented format ("%41") and the non-standard <em>%u</em>
# format ("%u0410") are both supported. The single-byte variant is decoded
# as if it represents bytes encoded with the same encoding as +str+. The
# two-byte <em>%u</em> variant is decoded as UTF-16BE and then re-encoded
# with the same encoding as +str+; surrogate pairs are supported.
#
# Since the resulting string will have the same encoding as +str+, all byte
# sequences resulting from the byte-oriented decoding must be valid sequences
# in the the encoding of +str+. Correspondingly, the encoding of +str+ must
# be compatible with any extended characters that are decoded from the
# UTF-16BE <em>%u</em> encodings.
def unescape(str)
hh = /[0-9a-f]{2}/i
hhhh = /[0-9a-f]{4}/i
str.gsub(/((?:%#{hh})+)|((?:%u#{hhhh})+)/) do
if $1
$1.scan(hh).map(&:hex).pack('C*').force_encoding(str.encoding)
elsif $2
$2.scan(hhhh).map(&:hex).pack('S*').force_encoding(Encoding::UTF_16BE).
encode!(str.encoding)
else
raise 'unhandled match'
end
end
end
def all_same?(e)
first = e.first
e.drop(1).all? { |o| o.eql?(first) }
end
ss = [
# %-encoded-UTF-16BE -> SJIS (just for something fun... UTF-8 works fine)
'%u041D%u0430%u0434%u043E%u0435%u043B'.encode!(Encoding::SJIS),
# %-encoded-ISO-8859-5 -> ISO-8859-5
'%bd%d0%d4%de%d5%db'.encode!(Encoding::ISO8859_5),
# %-encoded-UTF-8 -> UTF-8
'%d0%9d%d0%b0%d0%b4%d0%be%d0%b5%d0%bb'.encode!(Encoding::UTF_8),
]
ss2 = [ # demonstrate non-decoded content and UTF-16BE surrogate pair decoding
# %-encoded-UTF-16BE -> UTF-8
'A%uD801%uDC10%u0410'.encode!(Encoding::UTF_8),
# %-encoded-UTF-8 -> UTF-8
'%41%f0%90%90%90%D0%90'.encode!(Encoding::UTF_8),
]
ss = ss.map { |s| s = unescape(s) }.tap { |ss| p ss.map { |s| s.encoding } }
all_same? ss.map { |s| s.encode(Encoding::UTF_8) }
ss2 = ss2.map { |s| s = unescape(s) }.tap { |ss| p ss.map { |s| s.encoding } }
all_same? ss2.map { |s| s.encode(Encoding::UTF_8) }
通过 irb 运行时:
ruby-1.9.2-head > ss = ss.map { |s| s = unescape(s) }.tap { |ss| p ss.map { |s| s.encoding } }
[#<Encoding:Shift_JIS>, #<Encoding:ISO-8859-5>, #<Encoding:UTF-8>]
=> ["\x{844E}\x{8470}\x{8474}\x{8480}\x{8475}\x{847C}", "\xBD\xD0\xD4\xDE\xD5\xDB", "Надоел"]
ruby-1.9.2-head > all_same? ss.map { |s| s.encode(Encoding::UTF_8) }
=> true
ruby-1.9.2-head >
ruby-1.9.2-head > ss2 = ss2.map { |s| s = unescape(s) }.tap { |ss| p ss.map { |s| s.encoding } }
[#<Encoding:UTF-8>, #<Encoding:UTF-8>]
=> ["AА", "AА"]
ruby-1.9.2-head > all_same? ss2.map { |s| s.encode(Encoding::UTF_8) }
=> true