Bu istek paramları Rails'de nasıl ayrıştırılır?

Question

Web sunucuma gelen istekle s = "% u041D% u0430% u0434% u043E% u0435% u043B" gibi parazitler alıyorum.

Bu, Rails'deki normal UTF8 dizesine nasıl çözülür? Teşekkürler!

Answer 1

non-standard format produced by escape in JavaScript gibi görünüyor. Bu verileri gönderen kodu etkileyebilirseniz, muhtemelen bunun yerine encodeURI'u (UTF-8 kodlu karakterlerin “normal” yüzde kodlamasını veren) kullanmasını ayarlamaya çalışmalısınız.

# 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) } 

irb aracılığıyla çalıştırdığınızda:

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