mirror of
https://github.com/gchq/CyberChef.git
synced 2024-09-07 12:11:35 +02:00
235 lines
5.4 KiB
JavaScript
235 lines
5.4 KiB
JavaScript
/**
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* Web Worker to handle communications between the front-end and the core.
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*
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2017
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* @license Apache-2.0
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*/
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import Chef from "./Chef";
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import OperationConfig from "./config/OperationConfig.json";
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import OpModules from "./config/modules/OpModules";
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// Add ">" to the start of all log messages in the Chef Worker
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import loglevelMessagePrefix from "loglevel-message-prefix";
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loglevelMessagePrefix(log, {
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prefixes: [],
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staticPrefixes: [">"],
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prefixFormat: "%p"
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});
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// Set up Chef instance
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self.chef = new Chef();
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self.OpModules = OpModules;
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self.OperationConfig = OperationConfig;
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// Tell the app that the worker has loaded and is ready to operate
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self.postMessage({
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action: "workerLoaded",
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data: {}
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});
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/**
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* Respond to message from parent thread.
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*
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* Messages should have the following format:
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* {
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* action: "bake" | "silentBake",
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* data: {
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* input: {string},
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* recipeConfig: {[Object]},
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* options: {Object},
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* progress: {number},
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* step: {boolean}
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* } | undefined
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* }
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*/
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self.addEventListener("message", function(e) {
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// Handle message
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const r = e.data;
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log.debug("ChefWorker receiving command '" + r.action + "'");
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switch (r.action) {
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case "bake":
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bake(r.data);
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break;
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case "silentBake":
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silentBake(r.data);
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break;
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case "getDishAs":
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getDishAs(r.data);
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break;
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case "docURL":
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// Used to set the URL of the current document so that scripts can be
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// imported into an inline worker.
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self.docURL = r.data;
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break;
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case "highlight":
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calculateHighlights(
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r.data.recipeConfig,
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r.data.direction,
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r.data.pos
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);
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break;
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case "setLogLevel":
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log.setLevel(r.data, false);
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break;
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default:
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break;
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}
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});
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/**
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* Baking handler
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*
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* @param {Object} data
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*/
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async function bake(data) {
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// Ensure the relevant modules are loaded
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self.loadRequiredModules(data.recipeConfig);
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try {
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const response = await self.chef.bake(
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data.input, // The user's input
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data.recipeConfig, // The configuration of the recipe
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data.options, // Options set by the user
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data.progress, // The current position in the recipe
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data.step // Whether or not to take one step or execute the whole recipe
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);
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self.postMessage({
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action: "bakeComplete",
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data: Object.assign(response, {
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id: data.id
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})
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});
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} catch (err) {
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self.postMessage({
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action: "bakeError",
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data: Object.assign(err, {
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id: data.id
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})
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});
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}
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}
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/**
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* Silent baking handler
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*/
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function silentBake(data) {
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const duration = self.chef.silentBake(data.recipeConfig);
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self.postMessage({
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action: "silentBakeComplete",
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data: duration
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});
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}
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/**
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* Translates the dish to a given type.
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*/
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async function getDishAs(data) {
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const value = await self.chef.getDishAs(data.dish, data.type);
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self.postMessage({
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action: "dishReturned",
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data: {
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value: value,
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id: data.id
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}
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});
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}
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/**
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* Calculates highlight offsets if possible.
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*
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* @param {Object[]} recipeConfig
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* @param {string} direction
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* @param {Object} pos - The position object for the highlight.
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* @param {number} pos.start - The start offset.
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* @param {number} pos.end - The end offset.
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*/
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async function calculateHighlights(recipeConfig, direction, pos) {
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pos = await self.chef.calculateHighlights(recipeConfig, direction, pos);
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self.postMessage({
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action: "highlightsCalculated",
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data: pos
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});
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}
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/**
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* Checks that all required modules are loaded and loads them if not.
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*
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* @param {Object} recipeConfig
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*/
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self.loadRequiredModules = function(recipeConfig) {
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recipeConfig.forEach(op => {
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const module = self.OperationConfig[op.op].module;
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if (!OpModules.hasOwnProperty(module)) {
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log.info(`Loading ${module} module`);
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self.sendStatusMessage(`Loading ${module} module`);
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self.importScripts(`${self.docURL}/modules/${module}.js`);
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self.sendStatusMessage("");
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}
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});
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};
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/**
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* Send status update to the app.
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*
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* @param {string} msg
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*/
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self.sendStatusMessage = function(msg) {
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self.postMessage({
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action: "statusMessage",
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data: msg
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});
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};
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/**
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* Send an option value update to the app.
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*
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* @param {string} option
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* @param {*} value
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*/
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self.setOption = function(option, value) {
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self.postMessage({
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action: "optionUpdate",
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data: {
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option: option,
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value: value
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}
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});
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};
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/**
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* Send register values back to the app.
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*
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* @param {number} opIndex
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* @param {number} numPrevRegisters
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* @param {string[]} registers
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*/
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self.setRegisters = function(opIndex, numPrevRegisters, registers) {
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self.postMessage({
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action: "setRegisters",
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data: {
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opIndex: opIndex,
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numPrevRegisters: numPrevRegisters,
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registers: registers
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}
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});
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};
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