'use strict';
var utils = require('./utils');
var has = Object.prototype.hasOwnProperty;
var isArray = Array.isArray;
var defaults = {
allowDots: false,
allowPrototypes: false,
allowSparse: false,
arrayLimit: 20,
charset: 'utf-8',
charsetSentinel: false,
comma: false,
decoder: utils.decode,
delimiter: '&',
depth: 5,
ignoreQueryPrefix: false,
interpretNumericEntities: false,
parameterLimit: 1000,
parseArrays: true,
plainObjects: false,
strictNullHandling: false
};
var interpretNumericEntities = function (str) {
return str.replace(/&#(\d+);/g, function ($0, numberStr) {
return String.fromCharCode(parseInt(numberStr, 10));
});
};
var parseArrayValue = function (val, options) {
if (val && typeof val === 'string' && options.comma && val.indexOf(',') > -1) {
return val.split(',');
}
return val;
};
// This is what browsers will submit when the ✓ character occurs in an
// application/x-www-form-urlencoded body and the encoding of the page containing
// the form is iso-8859-1, or when the submitted form has an accept-charset
// attribute of iso-8859-1. Presumably also with other charsets that do not contain
// the ✓ character, such as us-ascii.
var isoSentinel = 'utf8=%26%2310003%3B'; // encodeURIComponent('✓')
// These are the percent-encoded utf-8 octets representing a checkmark, indicating that the request actually is utf-8 encoded.
var charsetSentinel = 'utf8=%E2%9C%93'; // encodeURIComponent('✓')
var parseValues = function parseQueryStringValues(str, options) {
var obj = {};
var cleanStr = options.ignoreQueryPrefix ? str.replace(/^\?/, '') : str;
var limit = options.parameterLimit === Infinity ? undefined : options.parameterLimit;
var parts = cleanStr.split(options.delimiter, limit);
var skipIndex = -1; // Keep track of where the utf8 sentinel was found
var i;
var charset = options.charset;
if (options.charsetSentinel) {
for (i = 0; i < parts.length; ++i) {
if (parts[i].indexOf('utf8=') === 0) {
if (parts[i] === charsetSentinel) {
charset = 'utf-8';
} else if (parts[i] === isoSentinel) {
charset = 'iso-8859-1';
}
skipIndex = i;
i = parts.length; // The eslint settings do not allow break;
}
}
}
for (i = 0; i < parts.length; ++i) {
if (i === skipIndex) {
continue;
}
var part = parts[i];
var bracketEqualsPos = part.indexOf(']=');
var pos = bracketEqualsPos === -1 ? part.indexOf('=') : bracketEqualsPos + 1;
var key, val;
if (pos === -1) {
key = options.decoder(part, defaults.decoder, charset, 'key');
val = options.strictNullHandling ? null : '';
} else {
key = options.decoder(part.slice(0, pos), defaults.decoder, charset, 'key');
val = utils.maybeMap(
parseArrayValue(part.slice(pos + 1), options),
function (encodedVal) {
return options.decoder(encodedVal, defaults.decoder, charset, 'value');
}
);
}
if (val && options.interpretNumericEntities && charset === 'iso-8859-1') {
val = interpretNumericEntities(val);
}
if (part.indexOf('[]=') > -1) {
val = isArray(val) ? [val] : val;
}
if (has.call(obj, key)) {
obj[key] = utils.combine(obj[key], val);
} else {
obj[key] = val;
}
}
return obj;
};
var parseObject = function (chain, val, options, valuesParsed) {
var leaf = valuesParsed ? val : parseArrayValue(val, options);
for (var i = chain.length - 1; i >= 0; --i) {
var obj;
var root = chain[i];
if (root === '[]' && options.parseArrays) {
obj = [].concat(leaf);
} else {
obj = options.plainObjects ? Object.create(null) : {};
var cleanRoot = root.charAt(0) === '[' && root.charAt(root.length - 1) === ']' ? root.slice(1, -1) : root;
var index = parseInt(cleanRoot, 10);
if (!options.parseArrays && cleanRoot === '') {
obj = { 0: leaf };
} else if (
!isNaN(index)
&& root !== cleanRoot
&& String(index) === cleanRoot
&& index >= 0
&& (options.parseArrays && index <= options.arrayLimit)
) {
obj = [];
obj[index] = leaf;
} else if (cleanRoot !== '__proto__') {
obj[cleanRoot] = leaf;
}
}
leaf = obj;
}
return leaf;
};
var parseKeys = function parseQueryStringKeys(givenKey, val, options, valuesParsed) {
if (!givenKey) {
return;
}
// Transform dot notation to bracket notation
var key = options.allowDots ? givenKey.replace(/\.([^.[]+)/g, '[$1]') : givenKey;
// The regex chunks
var brackets = /(\[[^[\]]*])/;
var child = /(\[[^[\]]*])/g;
// Get the parent
var segment = options.depth > 0 && brackets.exec(key);
var parent = segment ? key.slice(0, segment.index) : key;
// Stash the parent if it exists
var keys = [];
if (parent) {
// If we aren't using plain objects, optionally prefix keys that would overwrite object prototype properties
if (!options.plainObjects && has.call(Object.prototype, parent)) {
if (!options.allowPrototypes) {
return;
}
}
keys.push(parent);
}
// Loop through children appending to the array until we hit depth
var i = 0;
while (options.depth > 0 && (segment = child.exec(key)) !== null && i < options.depth) {
i += 1;
if (!options.plainObjects && has.call(Object.prototype, segment[1].slice(1, -1))) {
if (!options.allowPrototypes) {
return;
}
}
keys.push(segment[1]);
}
// If there's a remainder, just add whatever is left
if (segment) {
keys.push('[' + key.slice(segment.index) + ']');
}
return parseObject(keys, val, options, valuesParsed);
};
var normalizeParseOptions = function normalizeParseOptions(opts) {
if (!opts) {
return defaults;
}
if (opts.decoder !== null && opts.decoder !== undefined && typeof opts.decoder !== 'function') {
throw new TypeError('Decoder has to be a function.');
}
if (typeof opts.charset !== 'undefined' && opts.charset !== 'utf-8' && opts.charset !== 'iso-8859-1') {
throw new TypeError('The charset option must be either utf-8, iso-8859-1, or undefined');
}
var charset = typeof opts.charset === 'undefined' ? defaults.charset : opts.charset;
return {
allowDots: typeof opts.allowDots === 'undefined' ? defaults.allowDots : !!opts.allowDots,
allowPrototypes: typeof opts.allowPrototypes === 'boolean' ? opts.allowPrototypes : defaults.allowPrototypes,
allowSparse: typeof opts.allowSparse === 'boolean' ? opts.allowSparse : defaults.allowSparse,
arrayLimit: typeof opts.arrayLimit === 'number' ? opts.arrayLimit : defaults.arrayLimit,
charset: charset,
charsetSentinel: typeof opts.charsetSentinel === 'boolean' ? opts.charsetSentinel : defaults.charsetSentinel,
comma: typeof opts.comma === 'boolean' ? opts.comma : defaults.comma,
decoder: typeof opts.decoder === 'function' ? opts.decoder : defaults.decoder,
delimiter: typeof opts.delimiter === 'string' || utils.isRegExp(opts.delimiter) ? opts.delimiter : defaults.delimiter,
// eslint-disable-next-line no-implicit-coercion, no-extra-parens
depth: (typeof opts.depth === 'number' || opts.depth === false) ? +opts.depth : defaults.depth,
ignoreQueryPrefix: opts.ignoreQueryPrefix === true,
interpretNumericEntities: typeof opts.interpretNumericEntities === 'boolean' ? opts.interpretNumericEntities : defaults.interpretNumericEntities,
parameterLimit: typeof opts.parameterLimit === 'number' ? opts.parameterLimit : defaults.parameterLimit,
parseArrays: opts.parseArrays !== false,
plainObjects: typeof opts.plainObjects === 'boolean' ? opts.plainObjects : defaults.plainObjects,
strictNullHandling: typeof opts.strictNullHandling === 'boolean' ? opts.strictNullHandling : defaults.strictNullHandling
};
};
module.exports = function (str, opts) {
var options = normalizeParseOptions(opts);
if (str === '' || str === null || typeof str === 'undefined') {
return options.plainObjects ? Object.create(null) : {};
}
var tempObj = typeof str === 'string' ? parseValues(str, options) : str;
var obj = options.plainObjects ? Object.create(null) : {};
// Iterate over the keys and setup the new object
var keys = Object.keys(tempObj);
for (var i = 0; i < keys.length; ++i) {
var key = keys[i];
var newObj = parseKeys(key, tempObj[key], options, typeof str === 'string');
obj = utils.merge(obj, newObj, options);
}
if (options.allowSparse === true) {
return obj;
}
return utils.compact(obj);
};