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'use strict';
const { Buffer, kMaxLength } = require('buffer');
const { Writable } = require('stream');
const {
ERR_FS_INVALID_SYMLINK_TYPE,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_OPT_VALUE,
ERR_INVALID_OPT_VALUE_ENCODING,
ERR_OUT_OF_RANGE
} = require('internal/errors').codes;
const { isUint8Array } = require('internal/util/types');
const fs = require('fs');
const pathModule = require('path');
const util = require('util');
const {
O_APPEND,
O_CREAT,
O_EXCL,
O_RDONLY,
O_RDWR,
O_SYNC,
O_TRUNC,
O_WRONLY,
S_IFBLK,
S_IFCHR,
S_IFDIR,
S_IFIFO,
S_IFLNK,
S_IFMT,
S_IFREG,
S_IFSOCK,
UV_FS_SYMLINK_DIR,
UV_FS_SYMLINK_JUNCTION
} = process.binding('constants').fs;
const { statValues } = process.binding('fs');
const isWindows = process.platform === 'win32';
function assertEncoding(encoding) {
if (encoding && !Buffer.isEncoding(encoding)) {
throw new ERR_INVALID_OPT_VALUE_ENCODING(encoding);
}
}
function copyObject(source) {
var target = {};
for (var key in source)
target[key] = source[key];
return target;
}
function getOptions(options, defaultOptions) {
if (options === null || options === undefined ||
typeof options === 'function') {
return defaultOptions;
}
if (typeof options === 'string') {
defaultOptions = util._extend({}, defaultOptions);
defaultOptions.encoding = options;
options = defaultOptions;
} else if (typeof options !== 'object') {
throw new ERR_INVALID_ARG_TYPE('options', ['string', 'Object'], options);
}
if (options.encoding !== 'buffer')
assertEncoding(options.encoding);
return options;
}
function isInt32(n) { return n === (n | 0); }
function isUint32(n) { return n === (n >>> 0); }
function modeNum(m, def) {
if (typeof m === 'number')
return m;
if (typeof m === 'string') {
const parsed = parseInt(m, 8);
if (Number.isNaN(parsed))
return m;
return parsed;
}
// TODO(BridgeAR): Only return `def` in case `m == null`
if (def !== undefined)
return def;
return m;
}
// Check if the path contains null types if it is a string nor Uint8Array,
// otherwise return silently.
function nullCheck(path, propName, throwError = true) {
const pathIsString = typeof path === 'string';
const pathIsUint8Array = isUint8Array(path);
// We can only perform meaningful checks on strings and Uint8Arrays.
if (!pathIsString && !pathIsUint8Array) {
return;
}
if (pathIsString && path.indexOf('\u0000') === -1) {
return;
} else if (pathIsUint8Array && path.indexOf(0) === -1) {
return;
}
const err = new ERR_INVALID_ARG_VALUE(
propName,
path,
'must be a string or Uint8Array without null bytes'
);
if (throwError) {
Error.captureStackTrace(err, nullCheck);
throw err;
}
return err;
}
function preprocessSymlinkDestination(path, type, linkPath) {
if (!isWindows) {
// No preprocessing is needed on Unix.
return path;
} else if (type === 'junction') {
// Junctions paths need to be absolute and \\?\-prefixed.
// A relative target is relative to the link's parent directory.
path = pathModule.resolve(linkPath, '..', path);
return pathModule.toNamespacedPath(path);
} else {
// Windows symlinks don't tolerate forward slashes.
return ('' + path).replace(/\//g, '\\');
}
}
// Constructor for file stats.
function Stats(
dev,
mode,
nlink,
uid,
gid,
rdev,
blksize,
ino,
size,
blocks,
atim_msec,
mtim_msec,
ctim_msec,
birthtim_msec
) {
this.dev = dev;
this.mode = mode;
this.nlink = nlink;
this.uid = uid;
this.gid = gid;
this.rdev = rdev;
this.blksize = blksize;
this.ino = ino;
this.size = size;
this.blocks = blocks;
this.atimeMs = atim_msec;
this.mtimeMs = mtim_msec;
this.ctimeMs = ctim_msec;
this.birthtimeMs = birthtim_msec;
this.atime = new Date(atim_msec + 0.5);
this.mtime = new Date(mtim_msec + 0.5);
this.ctime = new Date(ctim_msec + 0.5);
this.birthtime = new Date(birthtim_msec + 0.5);
}
Stats.prototype._checkModeProperty = function(property) {
return ((this.mode & S_IFMT) === property);
};
Stats.prototype.isDirectory = function() {
return this._checkModeProperty(S_IFDIR);
};
Stats.prototype.isFile = function() {
return this._checkModeProperty(S_IFREG);
};
Stats.prototype.isBlockDevice = function() {
return this._checkModeProperty(S_IFBLK);
};
Stats.prototype.isCharacterDevice = function() {
return this._checkModeProperty(S_IFCHR);
};
Stats.prototype.isSymbolicLink = function() {
return this._checkModeProperty(S_IFLNK);
};
Stats.prototype.isFIFO = function() {
return this._checkModeProperty(S_IFIFO);
};
Stats.prototype.isSocket = function() {
return this._checkModeProperty(S_IFSOCK);
};
function statsFromValues(stats = statValues) {
return new Stats(stats[0], stats[1], stats[2], stats[3], stats[4], stats[5],
stats[6] < 0 ? undefined : stats[6], stats[7], stats[8],
stats[9] < 0 ? undefined : stats[9], stats[10], stats[11],
stats[12], stats[13]);
}
function stringToFlags(flags) {
if (typeof flags === 'number') {
return flags;
}
switch (flags) {
case 'r' : return O_RDONLY;
case 'rs' : // Fall through.
case 'sr' : return O_RDONLY | O_SYNC;
case 'r+' : return O_RDWR;
case 'rs+' : // Fall through.
case 'sr+' : return O_RDWR | O_SYNC;
case 'w' : return O_TRUNC | O_CREAT | O_WRONLY;
case 'wx' : // Fall through.
case 'xw' : return O_TRUNC | O_CREAT | O_WRONLY | O_EXCL;
case 'w+' : return O_TRUNC | O_CREAT | O_RDWR;
case 'wx+': // Fall through.
case 'xw+': return O_TRUNC | O_CREAT | O_RDWR | O_EXCL;
case 'a' : return O_APPEND | O_CREAT | O_WRONLY;
case 'ax' : // Fall through.
case 'xa' : return O_APPEND | O_CREAT | O_WRONLY | O_EXCL;
case 'as' : // Fall through.
case 'sa' : return O_APPEND | O_CREAT | O_WRONLY | O_SYNC;
case 'a+' : return O_APPEND | O_CREAT | O_RDWR;
case 'ax+': // Fall through.
case 'xa+': return O_APPEND | O_CREAT | O_RDWR | O_EXCL;
case 'as+': // Fall through.
case 'sa+': return O_APPEND | O_CREAT | O_RDWR | O_SYNC;
}
throw new ERR_INVALID_OPT_VALUE('flags', flags);
}
function stringToSymlinkType(type) {
let flags = 0;
if (typeof type === 'string') {
switch (type) {
case 'dir':
flags |= UV_FS_SYMLINK_DIR;
break;
case 'junction':
flags |= UV_FS_SYMLINK_JUNCTION;
break;
case 'file':
break;
default:
const err = new ERR_FS_INVALID_SYMLINK_TYPE(type);
Error.captureStackTrace(err, stringToSymlinkType);
throw err;
}
}
return flags;
}
// Temporary hack for process.stdout and process.stderr when piped to files.
function SyncWriteStream(fd, options) {
Writable.call(this);
options = options || {};
this.fd = fd;
this.readable = false;
this.autoClose = options.autoClose === undefined ? true : options.autoClose;
this.on('end', () => this._destroy());
}
util.inherits(SyncWriteStream, Writable);
SyncWriteStream.prototype._write = function(chunk, encoding, cb) {
fs.writeSync(this.fd, chunk, 0, chunk.length);
cb();
return true;
};
SyncWriteStream.prototype._destroy = function() {
if (this.fd === null) // already destroy()ed
return;
if (this.autoClose)
fs.closeSync(this.fd);
this.fd = null;
return true;
};
SyncWriteStream.prototype.destroySoon =
SyncWriteStream.prototype.destroy = function() {
this._destroy();
this.emit('close');
return true;
};
// converts Date or number to a fractional UNIX timestamp
function toUnixTimestamp(time, name = 'time') {
// eslint-disable-next-line eqeqeq
if (typeof time === 'string' && +time == time) {
return +time;
}
if (Number.isFinite(time)) {
if (time < 0) {
return Date.now() / 1000;
}
return time;
}
if (util.isDate(time)) {
// convert to 123.456 UNIX timestamp
return time.getTime() / 1000;
}
throw new ERR_INVALID_ARG_TYPE(name, ['Date', 'Time in seconds'], time);
}
function validateBuffer(buffer) {
if (!isUint8Array(buffer)) {
const err = new ERR_INVALID_ARG_TYPE('buffer',
['Buffer', 'Uint8Array'], buffer);
Error.captureStackTrace(err, validateBuffer);
throw err;
}
}
function validateLen(len) {
let err;
if (!isInt32(len)) {
if (typeof value !== 'number') {
err = new ERR_INVALID_ARG_TYPE('len', 'number', len);
} else {
// TODO(BridgeAR): Improve this error message.
err = new ERR_OUT_OF_RANGE('len', 'an integer', len);
}
}
if (err !== undefined) {
Error.captureStackTrace(err, validateLen);
throw err;
}
}
function validateOffsetLengthRead(offset, length, bufferLength) {
let err;
if (offset < 0 || offset >= bufferLength) {
err = new ERR_OUT_OF_RANGE('offset');
} else if (length < 0 || offset + length > bufferLength) {
err = new ERR_OUT_OF_RANGE('length');
}
if (err !== undefined) {
Error.captureStackTrace(err, validateOffsetLengthRead);
throw err;
}
}
function validateOffsetLengthWrite(offset, length, byteLength) {
let err;
if (offset > byteLength) {
err = new ERR_OUT_OF_RANGE('offset');
} else if (offset + length > byteLength || offset + length > kMaxLength) {
err = new ERR_OUT_OF_RANGE('length');
}
if (err !== undefined) {
Error.captureStackTrace(err, validateOffsetLengthWrite);
throw err;
}
}
function validatePath(path, propName = 'path') {
let err;
if (typeof path !== 'string' && !isUint8Array(path)) {
err = new ERR_INVALID_ARG_TYPE(propName, ['string', 'Buffer', 'URL'], path);
} else {
err = nullCheck(path, propName, false);
}
if (err !== undefined) {
Error.captureStackTrace(err, validatePath);
throw err;
}
}
function validateUint32(value, propName) {
if (!isUint32(value)) {
let err;
if (typeof value !== 'number') {
err = new ERR_INVALID_ARG_TYPE(propName, 'number', value);
} else if (!Number.isInteger(value)) {
err = new ERR_OUT_OF_RANGE(propName, 'an integer', value);
} else {
// 2 ** 32 === 4294967296
err = new ERR_OUT_OF_RANGE(propName, '>= 0 && < 4294967296', value);
}
Error.captureStackTrace(err, validateUint32);
throw err;
}
}
module.exports = {
assertEncoding,
copyObject,
getOptions,
isInt32,
isUint32,
modeNum,
nullCheck,
preprocessSymlinkDestination,
realpathCacheKey: Symbol('realpathCacheKey'),
statsFromValues,
stringToFlags,
stringToSymlinkType,
Stats,
SyncWriteStream,
toUnixTimestamp,
validateBuffer,
validateLen,
validateOffsetLengthRead,
validateOffsetLengthWrite,
validatePath,
validateUint32
};