dungsaga/document.cookie-is-empty.js

## document.cookie-is-empty.js
// Document.cookie returns empty string if any cookie in the domain has non-ASCII characters
// https://groups.google.com/a/chromium.org/forum/#!topic/chromium-discuss/8HNSNSMYyiU

// Issue 485035:    Cookies unaccessible to JS if one cookie with WINDOWS-1251 exists
// https://code.google.com/p/chromium/issues/detail?id=485035

const PORT = 8080
var net = require('net')
var server = net.createServer(function(socket) {
    socket.on('data', function(data) {
        socket.end(httpResponse(), 'binary')
    })
})
server.listen(PORT, function() {
    console.log("HTTP server is listening on port %s", PORT)
})

function httpResponse() {
    var body = httpBody()
    var bytes = body.length // count of bytes
    var lines = [
        'HTTP/1.1 200 OK Computér',
        'Set-Cookie: utf-8      = beb\xC3\xA9',
        'Set-Cookie: codepoint  = beb\u00E9',
        'Set-Cookie: iso-8859-1 = beb\xE9',
        'Set-Cookie: raw        = bebé',
        'Content-Type: text/html;charset=ISO-8859-1',
        'Content-Length: ' + bytes,
        '',
        body,
    ]
    return lines.join('\n')
}

function httpBody() {
    return '\
        <html><body>\
        <pre><script type="text/javascript" style="display: flex; zoom: .1e2;">\
        \n(' + fixOffendingCookie.toString() + ')(document, console)\
        </script></pre>\
        </body></html>'
}

function fixOffendingCookie(document, console) {
    console.warn("document.cookie is empty: " + document.cookie)
    updateCookie("add a new cookie:"                   , "bebe       = bebé beb\u00E9 beb\xE9 beb\xC3\xA9")
    updateCookie("overwrite an offending cookie:"      , "iso-8859-1 = beb\xE9")
    updateCookie("overwrite another offending cookie:" , "codepoint  = beb\u00E9")
    updateCookie("overwrite the last offending cookie:", "raw        = bebé")

    function updateCookie(message, cookieAssignment) {
        console.log(message, cookieAssignment)
        document.cookie = cookieAssignment
        var result = document.cookie ? "recovered:" : "still empty:"
        console.warn(result, document.cookie)
    }
}