/** * @author Jarmo van Lenthe [github.com/jarmovanlenthe] * @copyright Jarmo van Lenthe * @license Apache-2.0 */ import Operation from "../Operation.mjs"; import OperationError from "../errors/OperationError.mjs"; /** * PHP Deserialize operation */ class PHPDeserialize extends Operation { /** * PHPDeserialize constructor */ constructor() { super(); this.name = "PHP Deserialize"; this.module = "Default"; this.description = "Deserializes PHP serialized data, outputting keyed arrays as JSON.

This function does not support object tags.

Example:
a:2:{s:1:"a";i:10;i:0;a:1:{s:2:"ab";b:1;}}
becomes
{"a": 10,0: {"ab": true}}

Output valid JSON: JSON doesn't support integers as keys, whereas PHP serialization does. Enabling this will cast these integers to strings. This will also escape backslashes."; this.infoURL = "http://www.phpinternalsbook.com/classes_objects/serialization.html"; this.inputType = "string"; this.outputType = "string"; this.args = [ { "name": "Output valid JSON", "type": "boolean", "value": true } ]; } /** * @param {string} input * @param {Object[]} args * @returns {string} */ run(input, args) { /** * Recursive method for deserializing. * @returns {*} */ function handleInput() { /** * Read `length` characters from the input, shifting them out the input. * @param length * @returns {string} */ function read(length) { let result = ""; for (let idx = 0; idx < length; idx++) { const char = inputPart.shift(); if (char === undefined) { throw new OperationError("End of input reached before end of script"); } result += char; } return result; } /** * Read characters from the input until `until` is found. * @param until * @returns {string} */ function readUntil(until) { let result = ""; for (;;) { const char = read(1); if (char === until) { break; } else { result += char; } } return result; } /** * Read characters from the input that must be equal to `expect` * @param expect * @returns {string} */ function expect(expect) { const result = read(expect.length); if (result !== expect) { throw new OperationError("Unexpected input found"); } return result; } /** * Helper function to handle deserialized arrays. * @returns {Array} */ function handleArray() { const items = parseInt(readUntil(":"), 10) * 2; expect("{"); const result = []; let isKey = true; let lastItem = null; for (let idx = 0; idx < items; idx++) { const item = handleInput(); if (isKey) { lastItem = item; isKey = false; } else { const numberCheck = lastItem.match(/[0-9]+/); if (args[0] && numberCheck && numberCheck[0].length === lastItem.length) { result.push("\"" + lastItem + "\": " + item); } else { result.push(lastItem + ": " + item); } isKey = true; } } expect("}"); return result; } const kind = read(1).toLowerCase(); switch (kind) { case "n": expect(";"); return "null"; case "i": case "d": case "b": { expect(":"); const data = readUntil(";"); if (kind === "b") { return (parseInt(data, 10) !== 0); } return data; } case "a": expect(":"); return "{" + handleArray() + "}"; case "s": { expect(":"); const length = readUntil(":"); expect("\""); const value = read(length); expect("\";"); if (args[0]) { return "\"" + value.replace(/"/g, "\\\"") + "\""; } else { return "\"" + value + "\""; } } default: throw new OperationError("Unknown type: " + kind); } } const inputPart = input.split(""); return handleInput(); } } export default PHPDeserialize;