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(v6.x backport) url: fix surrogate handling in encodeAuth() #11387

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(v6.x backport) url: fix surrogate handling in encodeAuth() #11387

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url: fix surrogate handling in encodeAuth() 
Currently, the legacy URL stringifier miscalculates the offset of an
extra surrogate, causing the high surrogate to be included unescaped:

    > url.format({ auth: '\uD83D\uDE00', hostname: 'a' })
    '//%F0%9F%98%80�@A'

PR-URL: #11387
Backport-of: #11161
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@TimothyGu
TimothyGu committed Mar 4, 2017
commit 8100f592c338c0ee9682869c8e854f88ac55269d
50 changes: 30 additions & 20 deletions lib/url.js
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Original file line number Diff line number Diff line change
Expand Up @@ -948,44 +948,53 @@ function spliceOne(list, index) {
var hexTable = new Array(256);
for (var i = 0; i < 256; ++i)
hexTable[i] = '%' + ((i < 16 ? '0' : '') + i.toString(16)).toUpperCase();

// These characters do not need escaping:
// ! - . _ ~
// ' ( ) * :
// digits
// alpha (uppercase)
// alpha (lowercase)
const noEscapeAuth = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x00 - 0x0F
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x10 - 0x1F
0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, // 0x20 - 0x2F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, // 0x30 - 0x3F
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x40 - 0x4F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, // 0x50 - 0x5F
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0 // 0x70 - 0x7F
];

function encodeAuth(str) {
// faster encodeURIComponent alternative for encoding auth uri components
var out = '';
var lastPos = 0;
for (var i = 0; i < str.length; ++i) {
var c = str.charCodeAt(i);

// These characters do not need escaping:
// ! - . _ ~
// ' ( ) * :
// digits
// alpha (uppercase)
// alpha (lowercase)
if (c === 0x21 || c === 0x2D || c === 0x2E || c === 0x5F || c === 0x7E ||
(c >= 0x27 && c <= 0x2A) ||
(c >= 0x30 && c <= 0x3A) ||
(c >= 0x41 && c <= 0x5A) ||
(c >= 0x61 && c <= 0x7A)) {
continue;
}

if (i - lastPos > 0)
out += str.slice(lastPos, i);

lastPos = i + 1;

// Other ASCII characters
// ASCII
if (c < 0x80) {
if (noEscapeAuth[c] === 1)
continue;
if (lastPos < i)
out += str.slice(lastPos, i);
lastPos = i + 1;
out += hexTable[c];
continue;
}

if (lastPos < i)
out += str.slice(lastPos, i);

// Multi-byte characters ...
if (c < 0x800) {
lastPos = i + 1;
out += hexTable[0xC0 | (c >> 6)] + hexTable[0x80 | (c & 0x3F)];
continue;
}
if (c < 0xD800 || c >= 0xE000) {
lastPos = i + 1;
out += hexTable[0xE0 | (c >> 12)] +
hexTable[0x80 | ((c >> 6) & 0x3F)] +
hexTable[0x80 | (c & 0x3F)];
Expand All @@ -998,6 +1007,7 @@ function encodeAuth(str) {
c2 = str.charCodeAt(i) & 0x3FF;
else
c2 = 0;
lastPos = i + 1;
c = 0x10000 + (((c & 0x3FF) << 10) | c2);
out += hexTable[0xF0 | (c >> 18)] +
hexTable[0x80 | ((c >> 12) & 0x3F)] +
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13 changes: 12 additions & 1 deletion test/parallel/test-url.js
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Expand Up @@ -891,8 +891,19 @@ var parseTests = {
pathname: '/*',
path: '/*',
href: 'https:///*'
}
},

// surrogate in auth
'http://%F0%9F%98%80@www.example.com/': {
href: 'http://%F0%9F%98%80@www.example.com/',
slashes: true,
protocol: 'http:',
auth: '\uD83D\uDE00',
host: 'www.example.com',
hostname: 'www.example.com',
pathname: '/',
path: '/'
}
};

for (const u in parseTests) {
Expand Down