ESM: Ported OS operations
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n1474335
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src/core/operations/ParseUNIXFilePermissions.mjs
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323
src/core/operations/ParseUNIXFilePermissions.mjs
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/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*/
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import Operation from "../Operation";
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/**
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* Parse UNIX file permissions operation
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*/
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class ParseUNIXFilePermissions extends Operation {
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/**
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* ParseUNIXFilePermissions constructor
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*/
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constructor() {
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super();
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this.name = "Parse UNIX file permissions";
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this.module = "Default";
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this.description = "Given a UNIX/Linux file permission string in octal or textual format, this operation explains which permissions are granted to which user groups.<br><br>Input should be in either octal (e.g. <code>755</code>) or textual (e.g. <code>drwxr-xr-x</code>) format.";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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const perms = {
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d: false, // directory
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sl: false, // symbolic link
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np: false, // named pipe
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s: false, // socket
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cd: false, // character device
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bd: false, // block device
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dr: false, // door
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sb: false, // sticky bit
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su: false, // setuid
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sg: false, // setgid
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ru: false, // read user
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wu: false, // write user
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eu: false, // execute user
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rg: false, // read group
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wg: false, // write group
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eg: false, // execute group
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ro: false, // read other
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wo: false, // write other
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eo: false // execute other
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};
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let d = 0,
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u = 0,
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g = 0,
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o = 0,
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output = "",
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octal = null,
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textual = null;
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if (input.search(/\s*[0-7]{1,4}\s*/i) === 0) {
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// Input is octal
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octal = input.match(/\s*([0-7]{1,4})\s*/i)[1];
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if (octal.length === 4) {
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d = parseInt(octal[0], 8);
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u = parseInt(octal[1], 8);
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g = parseInt(octal[2], 8);
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o = parseInt(octal[3], 8);
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} else {
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if (octal.length > 0) u = parseInt(octal[0], 8);
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if (octal.length > 1) g = parseInt(octal[1], 8);
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if (octal.length > 2) o = parseInt(octal[2], 8);
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}
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perms.su = d >> 2 & 0x1;
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perms.sg = d >> 1 & 0x1;
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perms.sb = d & 0x1;
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perms.ru = u >> 2 & 0x1;
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perms.wu = u >> 1 & 0x1;
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perms.eu = u & 0x1;
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perms.rg = g >> 2 & 0x1;
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perms.wg = g >> 1 & 0x1;
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perms.eg = g & 0x1;
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perms.ro = o >> 2 & 0x1;
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perms.wo = o >> 1 & 0x1;
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perms.eo = o & 0x1;
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} else if (input.search(/\s*[dlpcbDrwxsStT-]{1,10}\s*/) === 0) {
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// Input is textual
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textual = input.match(/\s*([dlpcbDrwxsStT-]{1,10})\s*/)[1];
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switch (textual[0]) {
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case "d":
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perms.d = true;
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break;
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case "l":
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perms.sl = true;
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break;
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case "p":
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perms.np = true;
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break;
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case "s":
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perms.s = true;
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break;
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case "c":
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perms.cd = true;
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break;
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case "b":
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perms.bd = true;
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break;
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case "D":
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perms.dr = true;
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break;
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}
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if (textual.length > 1) perms.ru = textual[1] === "r";
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if (textual.length > 2) perms.wu = textual[2] === "w";
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if (textual.length > 3) {
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switch (textual[3]) {
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case "x":
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perms.eu = true;
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break;
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case "s":
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perms.eu = true;
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perms.su = true;
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break;
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case "S":
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perms.su = true;
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break;
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}
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}
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if (textual.length > 4) perms.rg = textual[4] === "r";
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if (textual.length > 5) perms.wg = textual[5] === "w";
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if (textual.length > 6) {
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switch (textual[6]) {
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case "x":
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perms.eg = true;
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break;
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case "s":
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perms.eg = true;
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perms.sg = true;
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break;
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case "S":
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perms.sg = true;
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break;
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}
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}
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if (textual.length > 7) perms.ro = textual[7] === "r";
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if (textual.length > 8) perms.wo = textual[8] === "w";
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if (textual.length > 9) {
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switch (textual[9]) {
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case "x":
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perms.eo = true;
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break;
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case "t":
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perms.eo = true;
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perms.sb = true;
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break;
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case "T":
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perms.sb = true;
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break;
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}
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}
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} else {
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return "Invalid input format.\nPlease enter the permissions in either octal (e.g. 755) or textual (e.g. drwxr-xr-x) format.";
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}
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output += "Textual representation: " + permsToStr(perms);
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output += "\nOctal representation: " + permsToOctal(perms);
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// File type
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if (textual) {
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output += "\nFile type: " + ftFromPerms(perms);
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}
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// setuid, setgid
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if (perms.su) {
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output += "\nThe setuid flag is set";
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}
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if (perms.sg) {
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output += "\nThe setgid flag is set";
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}
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// sticky bit
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if (perms.sb) {
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output += "\nThe sticky bit is set";
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}
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// Permission matrix
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output += `
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+---------+-------+-------+-------+
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| | User | Group | Other |
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+---------+-------+-------+-------+
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| Read | ${perms.ru ? "X" : " "} | ${perms.rg ? "X" : " "} | ${perms.ro ? "X" : " "} |
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+---------+-------+-------+-------+
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| Write | ${perms.wu ? "X" : " "} | ${perms.wg ? "X" : " "} | ${perms.wo ? "X" : " "} |
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+---------+-------+-------+-------+
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| Execute | ${perms.eu ? "X" : " "} | ${perms.eg ? "X" : " "} | ${perms.eo ? "X" : " "} |
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+---------+-------+-------+-------+`;
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return output;
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}
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}
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/**
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* Given a permissions object dictionary, generates a textual permissions string.
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*
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* @param {Object} perms
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* @returns {string}
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*/
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function permsToStr(perms) {
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let str = "",
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type = "-";
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if (perms.d) type = "d";
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if (perms.sl) type = "l";
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if (perms.np) type = "p";
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if (perms.s) type = "s";
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if (perms.cd) type = "c";
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if (perms.bd) type = "b";
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if (perms.dr) type = "D";
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str = type;
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str += perms.ru ? "r" : "-";
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str += perms.wu ? "w" : "-";
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if (perms.eu && perms.su) {
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str += "s";
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} else if (perms.su) {
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str += "S";
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} else if (perms.eu) {
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str += "x";
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} else {
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str += "-";
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}
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str += perms.rg ? "r" : "-";
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str += perms.wg ? "w" : "-";
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if (perms.eg && perms.sg) {
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str += "s";
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} else if (perms.sg) {
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str += "S";
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} else if (perms.eg) {
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str += "x";
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} else {
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str += "-";
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}
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str += perms.ro ? "r" : "-";
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str += perms.wo ? "w" : "-";
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if (perms.eo && perms.sb) {
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str += "t";
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} else if (perms.sb) {
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str += "T";
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} else if (perms.eo) {
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str += "x";
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} else {
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str += "-";
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}
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return str;
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}
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/**
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* Given a permissions object dictionary, generates an octal permissions string.
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*
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* @param {Object} perms
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* @returns {string}
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*/
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function permsToOctal(perms) {
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let d = 0,
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u = 0,
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g = 0,
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o = 0;
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if (perms.su) d += 4;
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if (perms.sg) d += 2;
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if (perms.sb) d += 1;
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if (perms.ru) u += 4;
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if (perms.wu) u += 2;
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if (perms.eu) u += 1;
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if (perms.rg) g += 4;
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if (perms.wg) g += 2;
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if (perms.eg) g += 1;
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if (perms.ro) o += 4;
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if (perms.wo) o += 2;
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if (perms.eo) o += 1;
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return d.toString() + u.toString() + g.toString() + o.toString();
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}
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/**
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* Given a permissions object dictionary, returns the file type.
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*
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* @param {Object} perms
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* @returns {string}
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*/
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function ftFromPerms(perms) {
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if (perms.d) return "Directory";
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if (perms.sl) return "Symbolic link";
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if (perms.np) return "Named pipe";
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if (perms.s) return "Socket";
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if (perms.cd) return "Character device";
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if (perms.bd) return "Block device";
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if (perms.dr) return "Door";
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return "Regular file";
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}
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export default ParseUNIXFilePermissions;
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