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Rails middleware to encode characters and avoid exploding controllers

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char_converter.rb
Ruby
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# config/initializers/char_converter.rb
require 'uri'
 
module Support
class CharConverter
 
SANITIZE_ENV_KEYS = [
"HTTP_COOKIE", # bad cookie encodings kill rack: https://github.com/rack/rack/issues/225
"HTTP_REFERER",
"PATH_INFO",
"QUERY_STRING",
"REQUEST_PATH",
"REQUEST_URI",
]
 
def initialize(app)
@app = app
end
 
def call(env)
@app.call(sanitize_env(env))
end
 
def sanitize_env(env)
SANITIZE_ENV_KEYS.each do |key|
next unless value = env[key]
value = sanitize_string(URI.decode(value))
env[key] = URI.encode(value)
end
env
end
 
def sanitize_string(string)
return string unless string.is_a? String
 
# Try it as UTF-8 directly
cleaned = string.dup.force_encoding('UTF-8')
if cleaned.valid_encoding?
cleaned
else
# Some of it might be old Windows code page
string.encode(Encoding::UTF_8, Encoding::Windows_1250)
end
rescue EncodingError
# Force it to UTF-8, throwing out invalid bits
string.encode!('UTF-8', invalid: :replace, undef: :replace)
end
 
end
end
 
Rails.application.config.middleware.insert_before(0, Support::CharConverter)

Great solution. Thanks

just for cross reference, because you did not fork the gist: https://gist.github.com/1336754

there is a mayor flaw in this implementation, as values from HTTP_COOKIE should not be url-encoded. i updated my version recently.

btw it's possible to fork gists instead to copy it.

There is one problem I have, when I used this module. My session data is reseting!

@entity1991 you could skip session data

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