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// Query String Utilities
'use strict';
const QueryString = exports;
const util = require('util');
// If obj.hasOwnProperty has been overridden, then calling
// obj.hasOwnProperty(prop) will break.
// See: https://github.com/joyent/node/issues/1707
function hasOwnProperty(obj, prop) {
return Object.prototype.hasOwnProperty.call(obj, prop);
}
function charCode(c) {
return c.charCodeAt(0);
}
// a safe fast alternative to decodeURIComponent
QueryString.unescapeBuffer = function(s, decodeSpaces) {
var out = new Buffer(s.length);
var state = 'CHAR'; // states: CHAR, HEX0, HEX1
var n, m, hexchar;
for (var inIndex = 0, outIndex = 0; inIndex <= s.length; inIndex++) {
var c = s.charCodeAt(inIndex);
switch (state) {
case 'CHAR':
switch (c) {
case charCode('%'):
n = 0;
m = 0;
state = 'HEX0';
break;
case charCode('+'):
if (decodeSpaces) c = charCode(' ');
// pass thru
default:
out[outIndex++] = c;
break;
}
break;
case 'HEX0':
state = 'HEX1';
hexchar = c;
if (charCode('0') <= c && c <= charCode('9')) {
n = c - charCode('0');
} else if (charCode('a') <= c && c <= charCode('f')) {
n = c - charCode('a') + 10;
} else if (charCode('A') <= c && c <= charCode('F')) {
n = c - charCode('A') + 10;
} else {
out[outIndex++] = charCode('%');
out[outIndex++] = c;
state = 'CHAR';
break;
}
break;
case 'HEX1':
state = 'CHAR';
if (charCode('0') <= c && c <= charCode('9')) {
m = c - charCode('0');
} else if (charCode('a') <= c && c <= charCode('f')) {
m = c - charCode('a') + 10;
} else if (charCode('A') <= c && c <= charCode('F')) {
m = c - charCode('A') + 10;
} else {
out[outIndex++] = charCode('%');
out[outIndex++] = hexchar;
out[outIndex++] = c;
break;
}
out[outIndex++] = 16 * n + m;
break;
}
}
// TODO support returning arbitrary buffers.
return out.slice(0, outIndex - 1);
};
QueryString.unescape = function(s, decodeSpaces) {
try {
return decodeURIComponent(s);
} catch (e) {
return QueryString.unescapeBuffer(s, decodeSpaces).toString();
}
};
QueryString.escape = function(str) {
return encodeURIComponent(str);
};
var stringifyPrimitive = function(v) {
if (util.isString(v))
return v;
if (util.isBoolean(v))
return v ? 'true' : 'false';
if (util.isNumber(v))
return isFinite(v) ? v : '';
return '';
};
QueryString.stringify = QueryString.encode = function(obj, sep, eq, options) {
sep = sep || '&';
eq = eq || '=';
var encode = QueryString.escape;
if (options && typeof options.encodeURIComponent === 'function') {
encode = options.encodeURIComponent;
}
if (util.isObject(obj)) {
var keys = Object.keys(obj);
var fields = [];
for (var i = 0; i < keys.length; i++) {
var k = keys[i];
var v = obj[k];
var ks = encode(stringifyPrimitive(k)) + eq;
if (util.isArray(v)) {
for (var j = 0; j < v.length; j++)
fields.push(ks + encode(stringifyPrimitive(v[j])));
} else {
fields.push(ks + encode(stringifyPrimitive(v)));
}
}
return fields.join(sep);
}
return '';
};
// Parse a key=val string.
QueryString.parse = QueryString.decode = function(qs, sep, eq, options) {
sep = sep || '&';
eq = eq || '=';
var obj = {};
if (!util.isString(qs) || qs.length === 0) {
return obj;
}
var regexp = /\+/g;
qs = qs.split(sep);
var maxKeys = 1000;
if (options && util.isNumber(options.maxKeys)) {
maxKeys = options.maxKeys;
}
var len = qs.length;
// maxKeys <= 0 means that we should not limit keys count
if (maxKeys > 0 && len > maxKeys) {
len = maxKeys;
}
var decode = QueryString.unescape;
if (options && typeof options.decodeURIComponent === 'function') {
decode = options.decodeURIComponent;
}
for (var i = 0; i < len; ++i) {
var x = qs[i].replace(regexp, '%20'),
idx = x.indexOf(eq),
kstr, vstr, k, v;
if (idx >= 0) {
kstr = x.substr(0, idx);
vstr = x.substr(idx + 1);
} else {
kstr = x;
vstr = '';
}
try {
k = decode(kstr);
v = decode(vstr);
} catch (e) {
k = QueryString.unescape(kstr, true);
v = QueryString.unescape(vstr, true);
}
if (!hasOwnProperty(obj, k)) {
obj[k] = v;
} else if (util.isArray(obj[k])) {
obj[k].push(v);
} else {
obj[k] = [obj[k], v];
}
}
return obj;
};
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