78 lines
2.5 KiB
TypeScript
78 lines
2.5 KiB
TypeScript
import { atob, isBackendService, isJSAllowed } from "../utilities"
|
|
import cloneDeep from "lodash/fp/clonedeep"
|
|
import { LITERAL_MARKER } from "../helpers/constants"
|
|
import { getJsHelperList } from "./list"
|
|
|
|
// The method of executing JS scripts depends on the bundle being built.
|
|
// This setter is used in the entrypoint (either index.js or index.mjs).
|
|
let runJS: (js: string, context: any) => any
|
|
export const setJSRunner = (runner: typeof runJS) => (runJS = runner)
|
|
|
|
export const removeJSRunner = () => {
|
|
runJS = undefined
|
|
}
|
|
|
|
let onErrorLog: (message: string) => void
|
|
export const setOnErrorLog = (delegate: typeof onErrorLog) =>
|
|
(onErrorLog = delegate)
|
|
|
|
// Helper utility to strip square brackets from a value
|
|
const removeSquareBrackets = (value: string) => {
|
|
if (!value || typeof value !== "string") {
|
|
return value
|
|
}
|
|
const regex = /\[+(.+)]+/
|
|
const matches = value.match(regex)
|
|
if (matches && matches[1]) {
|
|
return matches[1]
|
|
}
|
|
return value
|
|
}
|
|
|
|
// Our context getter function provided to JS code as $.
|
|
// Extracts a value from context.
|
|
const getContextValue = (path: string, context: any) => {
|
|
let data = context
|
|
path.split(".").forEach(key => {
|
|
if (data == null || typeof data !== "object") {
|
|
return null
|
|
}
|
|
data = data[removeSquareBrackets(key)]
|
|
})
|
|
return data
|
|
}
|
|
|
|
// Evaluates JS code against a certain context
|
|
export function processJS(handlebars: string, context: any) {
|
|
if (!isJSAllowed() || (isBackendService() && !runJS)) {
|
|
throw new Error("JS disabled in environment.")
|
|
}
|
|
try {
|
|
// Wrap JS in a function and immediately invoke it.
|
|
// This is required to allow the final `return` statement to be valid.
|
|
const js = `(function(){${atob(handlebars)}})();`
|
|
|
|
// Our $ context function gets a value from context.
|
|
// We clone the context to avoid mutation in the binding affecting real
|
|
// app context.
|
|
const sandboxContext = {
|
|
$: (path: string) => getContextValue(path, cloneDeep(context)),
|
|
helpers: getJsHelperList(),
|
|
}
|
|
|
|
// Create a sandbox with our context and run the JS
|
|
const res = { data: runJS(js, sandboxContext) }
|
|
return `{{${LITERAL_MARKER} js_result-${JSON.stringify(res)}}}`
|
|
} catch (error) {
|
|
onErrorLog && onErrorLog(error)
|
|
|
|
if (error.code === "ERR_SCRIPT_EXECUTION_TIMEOUT") {
|
|
return "Timed out while executing JS"
|
|
}
|
|
if (error.name === "ExecutionTimeoutError") {
|
|
return "Request JS execution limit hit"
|
|
}
|
|
return "Error while executing JS"
|
|
}
|
|
}
|