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filesystem.js
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filesystem.js
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'use strict';
const EOL = require('os').EOL;
const fs = require('fs-extra');
const path = require('path');
const pathIsInside = require('path-is-inside');
const systemError = require('./helpers/systemError');
const sanitize = require('./helpers/valueConversion');
const FlagSet = require('./helpers/flags');
// const Users = require('./users');
const UWOT_HIDDEN_PERMISSIONS_FILENAME = '.uwotprm';
const DEFAULT_OWNER = 'root';
const ALLOWED_NONE = [];
const ALLOWED_READ = ['r'];
const ALLOWED_WRITE = ['w'];
const ALLOWED_EXE = ['x'];
const ALLOWED_READ_WRITE = ['r','w'];
const ALLOWED_READ_EXE = ['r','x'];
const ALLOWED_WRITE_EXE = ['w','x'];
const ALLOWED_READ_WRITE_EXE = ['r','w','x'];
const DEFAULT_ALLOWED = ALLOWED_READ;
const VALID_CMDS = [
'cd',
'ls',
'pwd',
'mkdir',
'rm',
'rmdir',
'mv',
'cp',
'stat',
'touch',
'cat',
'chmod',
'chown'
];
const VALID_STAT_FORMAT_PLACEHOLDERS = [
'A',
'b',
'B',
'f',
'F',
'h',
'N',
's',
'U',
'w',
'W',
'x',
'X',
'y',
'Y'
];
const VALID_FILE_TYPES = [
'file',
'directory',
'symlink',
'socket',
'fifo'
];
class UwotFsPermissions {
constructor(permissions) {
if ('object' !== typeof permissions) {
throw new TypeError('argument of UwotFsPermissions constructor must be an object');
}
else if (null !== permissions) {
if ('string' === typeof permissions.owner) {
this.owner = sanitize.cleanString(permissions.owner);
}
else if ('undefined' !== typeof permissions.owner && null !== permissions.owner) {
this.owner = DEFAULT_OWNER;
}
delete permissions.owner;
if ('object' === typeof permissions.allowed && Array.isArray(permissions.allowed)) {
this.allowed = [];
permissions.allowed.forEach(function(val) {
switch(val) {
case 'r':
this.allowed.push('r');
break;
case 'w':
this.allowed.push('w');
break;
case 'x':
this.allowed.push('x');
break;
}
}.bind(this));
}
else if ('undefined' !== typeof permissions.allowed && null !== permissions.allowed) {
this.allowed = DEFAULT_ALLOWED;
}
delete permissions.allowed;
var permUsers = Object.keys(permissions);
delete permUsers.validUsers;
if (0 < permUsers.length) {
for (let i = 0; i < permUsers.length; i++) {
var thisName = permUsers[i];
let userPerms = [];
if ('object' === typeof permissions[thisName] && Array.isArray(permissions[thisName])) {
if (-1 !== permissions[thisName].indexOf('r')) {
userPerms.push('r');
}
if (-1 !== permissions[thisName].indexOf('w')) {
userPerms.push('w');
}
if (-1 !== permissions[thisName].indexOf('x')) {
userPerms.push('x');
}
this[thisName] = userPerms;
}
}
}
}
else {
this.owner = DEFAULT_OWNER;
this.allowed = DEFAULT_ALLOWED;
}
}
toGeneric() {
var genericPermissionsObj = {
owner: 'string' === typeof this.owner ? this.owner : DEFAULT_OWNER,
allowed: this.allowed
};
var permUsers = Object.keys(this);
for (let i = 0; i < permUsers.length; i++) {
if (this.hasOwnProperty(permUsers[i]) && 'owner' !== permUsers[i] && 'allowed' !== permUsers[i] && 'validUsers' !== permUsers[i] && 'object' === typeof this[permUsers[i]] && Array.isArray(this[permUsers[i]])) {
genericPermissionsObj[permUsers[i]] = this[permUsers[i]];
}
}
return genericPermissionsObj;
}
toJSON() {
return JSON.stringify(this.toGeneric());
}
getUserPermsArray(userName) {
var userList = Object.keys(this);
var userPerms = 'string' === typeof userName && -1 < userList.indexOf(userName) ? this[userName] : this.allowed;
return userPerms;
}
mayRead(userName) {
var userPerms = this.getUserPermsArray(userName);
return userPerms.indexOf('r') > -1;
}
mayWrite(userName) {
var userPerms = this.getUserPermsArray(userName);
return userPerms.indexOf('w') > -1;
}
mayExecute(userName) {
var userPerms = this.getUserPermsArray(userName);
return userPerms.indexOf('x') > -1;
}
getUserPermsString(userName) {
var userPerms = this.getUserPermsArray(userName);
var permLine = '';
if (-1 !== userPerms.indexOf('r')) {
permLine += 'r';
}
else {
permLine += '-';
}
if (-1 !== userPerms.indexOf('w')) {
permLine += 'w';
}
else {
permLine += '-';
}
if (-1 !== userPerms.indexOf('x')) {
permLine += 'x';
}
else {
permLine += '-';
}
return permLine;
}
// values of this override values of otherPerms if property matches
// returns new UwotFsPermissions object
concatPerms(otherPerms) {
var thisOwner = this.owner;
var thisAllowed = this.allowed;
var otherOwner, otherAllowed;
if ('object' !== typeof otherPerms) {
throw new TypeError('argument passed to concatPerms must be an object');
}
else if (null === otherPerms) {
return new UwotFsPermissions(this.toGeneric());
}
if ('string' === typeof otherPerms.owner) {
otherOwner = otherPerms.owner;
}
if('object' === typeof otherPerms.allowed && Array.isArray(otherPerms.allowed)) {
otherAllowed = otherPerms.allowed;
}
var otherPermsClassObj, newArg;
if ('UwotFsPermissions' !== otherPerms.constructor.name) {
try {
otherPermsClassObj = new UwotFsPermissions(otherPerms);
}
catch(e) {
return e;
}
}
else {
otherPermsClassObj = otherPerms;
}
try {
newArg = Object.assign(otherPermsClassObj.toGeneric(), this.toGeneric());
}
catch(e) {
return e;
}
if ('undefined' === typeof thisOwner || null === thisOwner) {
newArg.owner = otherOwner;
}
if ('undefined' === typeof thisAllowed || null === thisAllowed) {
newArg.allowed = otherAllowed;
}
try {
return new UwotFsPermissions(newArg);
}
catch(e) {
return e;
}
}
}
/*
vfs is implemented in posix-like manner.
it is NOT supposed to be a fully functional posix environment, so a lot of functions
are removed from the implementation. this can always be expanded by the config users,
with a LOT of work, but is possible.
The basic implementation works thusly:
* virtual 'root' is 'wot/fs'. this is hardcoded, can only be overridden by subclass of this, and some other rework.
* virtual '/pub/' is symlink to config server:pubDir. doesn't need to be in vroot.
* is '/var/www/html/' in vroot by default
* is default location for vCWD for guests(if enabled), users(if !users:createHome)
* generally where the 'stuff' is for the purpose of this app for public site
* virtual ~(user home dir) is '/home/[uname]' directly or by symlink
* is created in 'fs/home' by default if config 'users:createHome' enabled
* is default location for vCWD for users if enabled
* is read-only by default, can be writable for own user (or sudoer user) in config
'users:homeWritable'
* if config 'server:userDir' is changed, is created in that dir, and symlinked from
vroot '/home'
* generally only traversable by own user
* virtual fs 'cwd' is this.cwd, which is always a relative path from vroot
* this.getCwd returns the local filesystem absolute path for vcwd.
should only be used by methods of this class
* this.getVcwd returns an 'absolute' path with vroot as '/'.
may be used for values returned to console.
* this.resolvePath uses this.cwd as fallback after tilde expansion and checks
against absolute path. this allows vfs to resolve internal paths.
* all fs operations are synchronous
* async wrapper (this.cmd()) should be used by processes returning values to end user
* this method accepts bash/posix values for command names that match method logic, and array of arguments. Last arg allows to elevate permissions to 'root'
* 'root' user doesn't exist. this.sudo can be set for a single operation,
that's all. doesn't do much by default besides allowing access to other
user dirs (if user.maySudo()).
* if config 'users:sudoFullRoot' is set, this.sudo allows access to
everything in vroot, but cannot remove root dir or any of the dirs
on root level. because.
* 'su' is not included in binPath by default, so if that's the experience
you're after, you'll need to enable sudoFullRoot and include su in
a binpath for your final app
*/
// class for synchronous, user permissions limited filesystem ops.
class UwotFs {
constructor(userId, cwd) {
this.sudo = false;
this.dirsSet = false;
global.Uwot.Users.listUsers(function(error, userList) {
if (error) {
throw error;
}
else {
this.validUsers = userList;
}
}.bind(this));
if ('string' !== typeof userId) {
global.Uwot.Users.getGuest(function(error, user) {
if (error) {
throw error;
}
else {
this.user = user;
this.setDirs(cwd);
return;
}
}.bind(this));
}
else {
global.Uwot.Users.findById(userId, function(error, user) {
if (error) {
throw error;
}
else if (!user) {
global.Uwot.Users.getGuest(function(error, user) {
if (error) {
throw error;
}
else {
this.user = user;
this.user.maySudo = function() {return false;};
this.setDirs(cwd);
return;
}
}.bind(this));
}
else {
this.user = user;
this.setDirs(cwd);
return;
}
}.bind(this));
}
}
setDirs(userCwd) {
this.root = {
path: path.resolve(global.Uwot.Constants.appRoot, 'fs'),
r: true,
w: false,
x: false
};
this.pubDir = {
path: global.Uwot.Config.getVal('server', 'pubDir'),
r: true,
w: false,
x: false
};
this.userDir = this.user.uName === 'guest' ? null : {
path: path.resolve(global.Uwot.Config.getVal('server', 'userDir'), this.user.uName),
r: true,
w: global.Uwot.Config.getVal('users', 'homeWritable'),
x: false
};
var defaultcwd = null !== this.userDir ? this.userDir.path : this.pubDir.path;
if ('string' !== typeof userCwd) {
this.changeCwd(defaultcwd);
}
else {
var isValidCwdForUser = this.changeCwd(userCwd);
if (!isValidCwdForUser || isValidCwdForUser instanceof Error) {
this.changeCwd(defaultcwd);
}
}
this.dirsSet = true;
return this.dirsSet;
}
//async wrapper for fs commands.
// argArr accepts array of argument objects, empty array, or null
// isSudo accepts boolean or undefined
cmd(cmdName, argArr, callback, isSudo) {
//sanity
if ('function' !== typeof callback) {
throw new TypeError('invalid callback passed to cmd');
}
//check against valid
if ('string' !== typeof cmdName || 'object' !== typeof argArr || -1 === VALID_CMDS.indexOf(cmdName)) {
return callback(systemError.EINVAL({'syscall': 'signal'}), null);
}
else {
// set null args to empty array
if (null === argArr || !Array.isArray(argArr)) {
argArr = [];
}
//set this.sudo (checking if user is allowed)
if ('boolean' === typeof isSudo && isSudo && this.user.maySudo()) {
this.sudo = true;
}
else {
this.sudo = false;
}
var result;
try {
//perform matching command, expanding argArr
switch(cmdName) {
case 'cd':
result = this.changeCwd(...argArr);
break;
case 'ls':
// expected argArr:
// [(string)path, (bool)showInvisible, (bool)longForm]
var rawFileArr = this.readDir(argArr[0]);
argArr[1] = 'boolean' === typeof argArr[1] ? argArr[1] : false;
argArr[2] = 'boolean' === typeof argArr[2] ? argArr[2] : false;
var vprocFileArr = this.visibility(rawFileArr, argArr[0], argArr[1]);
result = argArr[2] ? this.longFormatFiles(vprocFileArr, argArr[0]) : vprocFileArr;
break;
case 'pwd':
result = this.getVcwd();
break;
case 'mkdir':
// will support -p (recursive path dir creation)
argArr[1] = 'boolean' === typeof argArr[1] ? argArr[1] : false;
result = this.createDir(...argArr);
break;
case 'rm':
//need to parse flags from argArr prior to calls...
// -d for dirs, -R recursive
result = this.removeFile(...argArr);
break;
case 'rmdir':
result = this.removeDir(...argArr);
break;
case 'mv':
// should support -n
// expected argArr:
// [(string)source, (string)target, (bool)noOverwrite]
argArr[2] = 'boolean' === typeof argArr[2] ? argArr[2] : false;
result = this.moveFile(...argArr);
break;
case 'cp':
// should support -n, -R
// expected argArr:
// [(string)source, (string)target, (bool)noOverwrite, (bool)isRecursive]
result = this.copy(...argArr);
break;
case 'stat':
// expected argArr:
// [(string)path, (bool)isVerbose, (bool)appendFtc, (string)format]
// support -v -f and -F but not multiple paths
result = this.stat(...argArr);
break;
case 'touch':
result = this.touch(...argArr);
break;
case 'cat':
// expected argArr:
// [(string)path(s), (string)separator]
var separator = argArr.pop();
result = this.cat(argArr, separator);
break;
case 'chmod':
// expected argArr:
// [(string)path, (array)allowed, (bool)isRecursive, (string)username]
result = this.changeAllowed(...argArr);
break;
case 'chown':
// expected argArr:
// [(string)path, (string)username, (bool)isRecursive]
result = this.changeOwner(...argArr);
break;
default:
result = systemError.EINVAL({'syscall': 'signal'});
}
}
catch(e) {
//set this.sudo = false
this.sudo = false;
return callback(e, null);
}
//set this.sudo = false
this.sudo = false;
//handle sync and system errors
// just passing these through for now
//return result or error
if (result instanceof Error) {
if (result.hasOwnProperty('code')) {
var seCode = result.code;
var sePath, seTarget;
if ('string' === typeof result.path && 'string' === typeof result.dest) {
sePath = 'string' === typeof result.path && this.isInRoot(result.path) ? this.dissolvePath(result.path) : result.path;
seTarget = 'string' === typeof result.dest && this.isInRoot(result.dest) ? this.dissolvePath(result.dest) : result.dest;
result = systemError[seCode]({syscall: result.syscall, path: sePath, dest: seTarget});
}
else if ('string' === typeof result.dest) {
seTarget = 'string' === typeof result.dest && this.isInRoot(result.dest) ? this.dissolvePath(result.dest) : result.dest;
result = systemError[seCode]({syscall: result.syscall, dest: seTarget});
}
else if ('string' === typeof result.path) {
sePath = 'string' === typeof result.path && this.isInRoot(result.path) ? this.dissolvePath(result.path) : result.path;
result = systemError[seCode]({syscall: result.syscall, path: sePath});
}
}
return callback(result, null);
}
else {
return callback(false, result);
}
}
}
// TBD
// set req.session.vfsCwd
changeCwd(pth) {
//check is string
if ('string' !== typeof pth) {
return new TypeError('path must be a string');
}
else {
//resolve
var absPth = this.resolvePath(pth);
if('string' !== typeof absPth) {
return absPth;
}
//check isReadable
var canRead = this.isReadable(absPth);
//check isDirectory
var pthIsDirectory;
try {
pthIsDirectory = fs.statSync(absPth).isDirectory();
}
catch(dirErr) {
return dirErr;
}
if (canRead instanceof Error) {
return canRead;
}
else if (!pthIsDirectory) {
return systemError.ENOTDIR({syscall: 'stat', path: pth});
}
else if (canRead && absPth === this.root.path) {
this.cwd = '';
return true;
}
else if (canRead) {
this.cwd = absPth.replace(this.root.path + path.sep, '');
return true;
}
else {
return systemError.EACCES({'path': pth, 'syscall': 'chdir'});
}
}
}
// this.cwd is relative path to this.root.path
// TBD
// get req.session.vfsCwd
// check if user can access that dir
getVcwd() {
return 'string' === typeof this.cwd && '' !== this.cwd ? path.sep + this.cwd : path.sep;
}
// returns absolute path of this.cwd
// TBD
// get req.session.vfsCwd
// check if user can access that dir
getCwd() {
return 'string' === typeof this.cwd && '' !== this.cwd ? path.resolve(this.root.path, this.cwd) : this.root.path;
}
append(pth, data) {
var fullPath;
var fileName = path.basename(pth);
if (path.isAbsolute(pth) && -1 !== pth.indexOf(this.root.path)) {
fullPath = pth;
}
else {
fullPath = this.resolvePath(pth, false);
if ('string' !== typeof fullPath) {
return fullPath;
}
}
fullPath = path.dirname(fullPath);
var canWrite = this.isWritable(fullPath);
if (canWrite instanceof Error) {
return canWrite;
}
else if (canWrite) {
try {
fs.appendFileSync(path.join(fullPath, fileName), data);
return true;
}
catch(e) {
return e;
}
}
else {
return systemError.EACCES({'path': pth, 'syscall': 'write'});
}
}
touch(pth) {
var fullPath;
var fileName = path.basename(pth);
if (path.isAbsolute(pth) && -1 !== pth.indexOf(this.root.path)) {
fullPath = pth;
}
else {
fullPath = this.resolvePath(pth, false);
if ('string' !== typeof fullPath) {
return fullPath;
}
}
fullPath = path.dirname(fullPath);
var now = new Date();
var canWrite = this.isWritable(fullPath);
if (canWrite instanceof Error) {
return canWrite;
}
else if (canWrite) {
try {
fs.appendFileSync(path.join(fullPath, fileName), '');
}
catch(e) {
if (e instanceof Error && 'string' === typeof e.code && 'EISDIR' === e.code) {
try {
fs.utimesSync(path.join(fullPath, fileName), now, now);
return true;
}
catch(err) {
return err;
}
}
return e;
}
try {
fs.utimesSync(path.join(fullPath, fileName), now, now);
return true;
}
catch(e) {
return e;
}
}
else {
return systemError.EACCES({'path': pth, 'syscall': 'write'});
}
}
cat(pthArr, separator) {
var catArr = [];
separator = 'string' === typeof separator ? separator : EOL;
for (let catIdx = 0; catIdx < pthArr.length; catIdx++) {
if ('string' === typeof pthArr[catIdx]) {
let thisFileString = this.readFile(pthArr[catIdx]);
if ('object' === typeof thisFileString && thisFileString instanceof Error) {
catIdx = pthArr.length;
return thisFileString;
}
else if ('string' !== typeof thisFileString) {
catIdx = pthArr.length;
return systemError.EIO({syscall: 'read', path: pthArr[catIdx]});
}
else {
catArr.push(thisFileString);
}
}
else {
catIdx = pthArr.length;
return systemError.EINVAL({syscall: 'read'});
}
if ((catIdx + 1) >= pthArr.length) {
// Extra EOL is default between files; default POSIX would require '' as separator
return catArr.join(separator+EOL);
}
}
}
copy(source, target, noOverwrite, isRecursive) {
noOverwrite = 'boolean' === typeof noOverwrite ? noOverwrite : false;
isRecursive = 'boolean' === typeof isRecursive ? isRecursive : false;
var fullPathSource, fullPathTarget;
var fileNameSource = path.basename(source);
var fileNameTarget = path.basename(target);
if (path.isAbsolute(source) && -1 !== source.indexOf(this.root.path)) {
fullPathSource = source;
}
else {
fullPathSource = this.resolvePath(source, false);
if ('string' !== typeof fullPathSource) {
return fullPathSource;
}
}
if (path.isAbsolute(target) && -1 !== target.indexOf(this.root.path)) {
fullPathTarget = target;
}
else {
fullPathTarget = this.resolvePath(target, false);
if ('string' !== typeof fullPathTarget) {
return fullPathTarget;
}
}
fullPathSource = path.dirname(fullPathSource);
fullPathTarget = path.dirname(fullPathTarget);
var canRead = this.isReadable(fullPathSource);
var canWrite = this.isWritable(fullPathTarget);
if (canRead instanceof Error) {
return canRead;
}
else if (canWrite instanceof Error) {
return canWrite;
}
else if (canRead && canWrite) {
var cpOpts;
if (isRecursive) {
try {
cpOpts = {
overwrite: !noOverwrite,
errorOnExist : true
};
fs.copySync(path.join(fullPathSource, fileNameSource), path.join(fullPathTarget, fileNameTarget), cpOpts);
return true;
}
catch(e) {
return e;
}
}
else {
try {