// Query String Utilities 'use strict'; const QueryString = exports; 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(); } }; var hexTable = new Array(256); for (var i = 0; i < 256; ++i) hexTable[i] = '%' + ((i < 16 ? '0' : '') + i.toString(16)).toUpperCase(); QueryString.escape = function(str) { // replaces encodeURIComponent // http://www.ecma-international.org/ecma-262/5.1/#sec-15.1.3.4 str = '' + str; var len = str.length; var out = ''; var i, c; if (len === 0) return str; for (i = 0; i < len; ++i) { c = str.charCodeAt(i); // These characters do not need escaping (in order): // ! - . _ ~ // ' ( ) * // digits // alpha (uppercase) // alpha (lowercase) if (c === 0x21 || c === 0x2D || c === 0x2E || c === 0x5F || c === 0x7E || (c >= 0x27 && c <= 0x2A) || (c >= 0x30 && c <= 0x39) || (c >= 0x41 && c <= 0x5A) || (c >= 0x61 && c <= 0x7A)) { out += str[i]; continue; } // Other ASCII characters if (c < 0x80) { out += hexTable[c]; continue; } // Multi-byte characters ... if (c < 0x800) { out += hexTable[0xC0 | (c >> 6)] + hexTable[0x80 | (c & 0x3F)]; continue; } if (c < 0xD800 || c >= 0xE000) { out += hexTable[0xE0 | (c >> 12)] + hexTable[0x80 | ((c >> 6) & 0x3F)] + hexTable[0x80 | (c & 0x3F)]; continue; } // Surrogate pair ++i; c = 0x10000 + (((c & 0x3FF) << 10) | (str.charCodeAt(i) & 0x3FF)); out += hexTable[0xF0 | (c >> 18)] + hexTable[0x80 | ((c >> 12) & 0x3F)] + hexTable[0x80 | ((c >> 6) & 0x3F)] + hexTable[0x80 | (c & 0x3F)]; } return out; }; var stringifyPrimitive = function(v) { if (typeof v === 'string') return v; if (typeof v === 'number' && isFinite(v)) return '' + v; if (typeof v === 'boolean') return v ? 'true' : 'false'; 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 (obj !== null && typeof obj === 'object') { var keys = Object.keys(obj); var len = keys.length; var flast = len - 1; var fields = ''; for (var i = 0; i < len; ++i) { var k = keys[i]; var v = obj[k]; var ks = encode(stringifyPrimitive(k)) + eq; if (Array.isArray(v)) { var vlen = v.length; var vlast = vlen - 1; for (var j = 0; j < vlen; ++j) { fields += ks + encode(stringifyPrimitive(v[j])); if (j < vlast) fields += sep; } if (vlen && i < flast) fields += sep; } else { fields += ks + encode(stringifyPrimitive(v)); if (i < flast) fields += sep; } } return fields; } return ''; }; // Parse a key=val string. QueryString.parse = QueryString.decode = function(qs, sep, eq, options) { sep = sep || '&'; eq = eq || '='; var obj = {}; if (typeof qs !== 'string' || qs.length === 0) { return obj; } var regexp = /\+/g; qs = qs.split(sep); var maxKeys = 1000; if (options && typeof options.maxKeys === 'number') { 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; } var keys = []; for (var i = 0; i < len; ++i) { var x = qs[i].replace(regexp, '%20'), idx = x.indexOf(eq), k, v; if (idx >= 0) { k = decodeStr(x.substring(0, idx), decode); v = decodeStr(x.substring(idx + 1), decode); } else { k = decodeStr(x, decode); v = ''; } if (keys.indexOf(k) === -1) { obj[k] = v; keys.push(k); } else if (Array.isArray(obj[k])) { obj[k].push(v); } else { obj[k] = [obj[k], v]; } } return obj; }; function decodeStr(s, decoder) { try { return decoder(s); } catch (e) { return QueryString.unescape(s, true); } }