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| 1 | +import { readFile, writeFile } from 'node:fs/promises'; |
| 2 | +import process from 'node:process'; |
| 3 | +import { PrefixedLogger } from './utils/console-style.js'; |
| 4 | + |
| 5 | +const CONFIG_PATH = 'config.json'; |
| 6 | +const OVERRIDES_ENV = 'CLIENT_CONFIG_OVERRIDES_JSON'; |
| 7 | +const STRICT_ENV = 'CLIENT_CONFIG_OVERRIDES_STRICT'; |
| 8 | +const logger = new PrefixedLogger('[config-inject]'); |
| 9 | + |
| 10 | +const formatError = (error) => { |
| 11 | + if (error instanceof Error) return error.stack ?? error.message; |
| 12 | + return String(error); |
| 13 | +}; |
| 14 | + |
| 15 | +const UNSAFE_KEYS = new Set(['__proto__', 'constructor', 'prototype']); |
| 16 | + |
| 17 | +const isPlainObject = (value) => |
| 18 | + typeof value === 'object' && value !== null && !Array.isArray(value); |
| 19 | + |
| 20 | +const deepMerge = (target, source) => { |
| 21 | + if (!isPlainObject(target) || !isPlainObject(source)) return source; |
| 22 | + |
| 23 | + const merged = { ...target }; |
| 24 | + Object.entries(source).forEach(([key, value]) => { |
| 25 | + if (UNSAFE_KEYS.has(key)) return; |
| 26 | + const targetValue = merged[key]; |
| 27 | + merged[key] = |
| 28 | + isPlainObject(targetValue) && isPlainObject(value) ? deepMerge(targetValue, value) : value; |
| 29 | + }); |
| 30 | + return merged; |
| 31 | +}; |
| 32 | + |
| 33 | +const failOnError = process.env[STRICT_ENV] === 'true'; |
| 34 | +const overridesRaw = process.env[OVERRIDES_ENV]; |
| 35 | + |
| 36 | +if (!overridesRaw) { |
| 37 | + logger.info(`No ${OVERRIDES_ENV} provided; leaving ${CONFIG_PATH} unchanged.`); |
| 38 | + process.exit(0); |
| 39 | +} |
| 40 | + |
| 41 | +let fileConfig; |
| 42 | +let overrides; |
| 43 | + |
| 44 | +try { |
| 45 | + const file = await readFile(CONFIG_PATH, 'utf8'); |
| 46 | + fileConfig = JSON.parse(file); |
| 47 | +} catch (error) { |
| 48 | + logger.error(`Failed reading ${CONFIG_PATH}: ${formatError(error)}`); |
| 49 | + process.exit(1); |
| 50 | +} |
| 51 | + |
| 52 | +try { |
| 53 | + overrides = JSON.parse(overridesRaw); |
| 54 | + if (!isPlainObject(overrides)) { |
| 55 | + throw new Error(`${OVERRIDES_ENV} must be a JSON object.`); |
| 56 | + } |
| 57 | +} catch (error) { |
| 58 | + const message = `[config-inject] Invalid ${OVERRIDES_ENV}; ${ |
| 59 | + failOnError ? 'failing build' : 'skipping overrides' |
| 60 | + }.`; |
| 61 | + if (failOnError) { |
| 62 | + logger.error(`${message} ${formatError(error)}`); |
| 63 | + process.exit(1); |
| 64 | + } |
| 65 | + logger.info(`[warning] ${message} ${formatError(error)}`); |
| 66 | + process.exit(0); |
| 67 | +} |
| 68 | + |
| 69 | +const mergedConfig = deepMerge(fileConfig, overrides); |
| 70 | + |
| 71 | +await writeFile(CONFIG_PATH, `${JSON.stringify(mergedConfig, null, 2)}\n`, 'utf8'); |
| 72 | +logger.info( |
| 73 | + `Applied overrides to ${CONFIG_PATH}. Top-level keys: ${Object.keys(overrides).join(', ')}` |
| 74 | +); |
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