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const fs = require('fs')
const path = require('path')
const os = require('os')
const crypto = require('crypto')
const packageJson = require('../package.json')
const version = packageJson.version
const LINE = /(?:^|^)\s*(?:export\s+)?([\w.-]+)(?:\s*=\s*?|:\s+?)(\s*'(?:\\'|[^'])*'|\s*"(?:\\"|[^"])*"|\s*`(?:\\`|[^`])*`|[^#\r\n]+)?\s*(?:#.*)?(?:$|$)/mg
// Parse src into an Object
function parse (src) {
const obj = {}
// Convert buffer to string
let lines = src.toString()
// Convert line breaks to same format
lines = lines.replace(/\r\n?/mg, '\n')
let match
while ((match = LINE.exec(lines)) != null) {
const key = match[1]
// Default undefined or null to empty string
let value = (match[2] || '')
// Remove whitespace
value = value.trim()
// Check if double quoted
const maybeQuote = value[0]
// Remove surrounding quotes
value = value.replace(/^(['"`])([\s\S]*)\1$/mg, '$2')
// Expand newlines if double quoted
if (maybeQuote === '"') {
value = value.replace(/\\n/g, '\n')
value = value.replace(/\\r/g, '\r')
}
// Add to object
obj[key] = value
}
return obj
}
function _parseVault (options) {
const vaultPath = _vaultPath(options)
// Parse .env.vault
const result = DotenvModule.configDotenv({ path: vaultPath })
if (!result.parsed) {
const err = new Error(`MISSING_DATA: Cannot parse ${vaultPath} for an unknown reason`)
err.code = 'MISSING_DATA'
throw err
}
// handle scenario for comma separated keys - for use with key rotation
// example: DOTENV_KEY="dotenv://:key_1234@dotenvx.com/vault/.env.vault?environment=prod,dotenv://:key_7890@dotenvx.com/vault/.env.vault?environment=prod"
const keys = _dotenvKey(options).split(',')
const length = keys.length
let decrypted
for (let i = 0; i < length; i++) {
try {
// Get full key
const key = keys[i].trim()
// Get instructions for decrypt
const attrs = _instructions(result, key)
// Decrypt
decrypted = DotenvModule.decrypt(attrs.ciphertext, attrs.key)
break
} catch (error) {
// last key
if (i + 1 >= length) {
throw error
}
// try next key
}
}
// Parse decrypted .env string
return DotenvModule.parse(decrypted)
}
function _log (message) {
console.log(`[dotenv@${version}][INFO] ${message}`)
}
function _warn (message) {
console.log(`[dotenv@${version}][WARN] ${message}`)
}
function _debug (message) {
console.log(`[dotenv@${version}][DEBUG] ${message}`)
}
function _dotenvKey (options) {
// prioritize developer directly setting options.DOTENV_KEY
if (options && options.DOTENV_KEY && options.DOTENV_KEY.length > 0) {
return options.DOTENV_KEY
}
// secondary infra already contains a DOTENV_KEY environment variable
if (process.env.DOTENV_KEY && process.env.DOTENV_KEY.length > 0) {
return process.env.DOTENV_KEY
}
// fallback to empty string
return ''
}
function _instructions (result, dotenvKey) {
// Parse DOTENV_KEY. Format is a URI
let uri
try {
uri = new URL(dotenvKey)
} catch (error) {
if (error.code === 'ERR_INVALID_URL') {
const err = new Error('INVALID_DOTENV_KEY: Wrong format. Must be in valid uri format like dotenv://:key_1234@dotenvx.com/vault/.env.vault?environment=development')
err.code = 'INVALID_DOTENV_KEY'
throw err
}
throw error
}
// Get decrypt key
const key = uri.password
if (!key) {
const err = new Error('INVALID_DOTENV_KEY: Missing key part')
err.code = 'INVALID_DOTENV_KEY'
throw err
}
// Get environment
const environment = uri.searchParams.get('environment')
if (!environment) {
const err = new Error('INVALID_DOTENV_KEY: Missing environment part')
err.code = 'INVALID_DOTENV_KEY'
throw err
}
// Get ciphertext payload
const environmentKey = `DOTENV_VAULT_${environment.toUpperCase()}`
const ciphertext = result.parsed[environmentKey] // DOTENV_VAULT_PRODUCTION
if (!ciphertext) {
const err = new Error(`NOT_FOUND_DOTENV_ENVIRONMENT: Cannot locate environment ${environmentKey} in your .env.vault file.`)
err.code = 'NOT_FOUND_DOTENV_ENVIRONMENT'
throw err
}
return { ciphertext, key }
}
function _vaultPath (options) {
let possibleVaultPath = null
if (options && options.path && options.path.length > 0) {
if (Array.isArray(options.path)) {
for (const filepath of options.path) {
if (fs.existsSync(filepath)) {
possibleVaultPath = filepath.endsWith('.vault') ? filepath : `${filepath}.vault`
}
}
} else {
possibleVaultPath = options.path.endsWith('.vault') ? options.path : `${options.path}.vault`
}
} else {
possibleVaultPath = path.resolve(process.cwd(), '.env.vault')
}
if (fs.existsSync(possibleVaultPath)) {
return possibleVaultPath
}
return null
}
function _resolveHome (envPath) {
return envPath[0] === '~' ? path.join(os.homedir(), envPath.slice(1)) : envPath
}
function _configVault (options) {
_log('Loading env from encrypted .env.vault')
const parsed = DotenvModule._parseVault(options)
let processEnv = process.env
if (options && options.processEnv != null) {
processEnv = options.processEnv
}
DotenvModule.populate(processEnv, parsed, options)
return { parsed }
}
function configDotenv (options) {
const dotenvPath = path.resolve(process.cwd(), '.env')
let encoding = 'utf8'
const debug = Boolean(options && options.debug)
if (options && options.encoding) {
encoding = options.encoding
} else {
if (debug) {
_debug('No encoding is specified. UTF-8 is used by default')
}
}
let optionPaths = [dotenvPath] // default, look for .env
if (options && options.path) {
if (!Array.isArray(options.path)) {
optionPaths = [_resolveHome(options.path)]
} else {
optionPaths = [] // reset default
for (const filepath of options.path) {
optionPaths.push(_resolveHome(filepath))
}
}
}
// Build the parsed data in a temporary object (because we need to return it). Once we have the final
// parsed data, we will combine it with process.env (or options.processEnv if provided).
let lastError
const parsedAll = {}
for (const path of optionPaths) {
try {
// Specifying an encoding returns a string instead of a buffer
const parsed = DotenvModule.parse(fs.readFileSync(path, { encoding }))
DotenvModule.populate(parsedAll, parsed, options)
} catch (e) {
if (debug) {
_debug(`Failed to load ${path} ${e.message}`)
}
lastError = e
}
}
let processEnv = process.env
if (options && options.processEnv != null) {
processEnv = options.processEnv
}
DotenvModule.populate(processEnv, parsedAll, options)
if (lastError) {
return { parsed: parsedAll, error: lastError }
} else {
return { parsed: parsedAll }
}
}
// Populates process.env from .env file
function config (options) {
// fallback to original dotenv if DOTENV_KEY is not set
if (_dotenvKey(options).length === 0) {
return DotenvModule.configDotenv(options)
}
const vaultPath = _vaultPath(options)
// dotenvKey exists but .env.vault file does not exist
if (!vaultPath) {
_warn(`You set DOTENV_KEY but you are missing a .env.vault file at ${vaultPath}. Did you forget to build it?`)
return DotenvModule.configDotenv(options)
}
return DotenvModule._configVault(options)
}
function decrypt (encrypted, keyStr) {
const key = Buffer.from(keyStr.slice(-64), 'hex')
let ciphertext = Buffer.from(encrypted, 'base64')
const nonce = ciphertext.subarray(0, 12)
const authTag = ciphertext.subarray(-16)
ciphertext = ciphertext.subarray(12, -16)
try {
const aesgcm = crypto.createDecipheriv('aes-256-gcm', key, nonce)
aesgcm.setAuthTag(authTag)
return `${aesgcm.update(ciphertext)}${aesgcm.final()}`
} catch (error) {
const isRange = error instanceof RangeError
const invalidKeyLength = error.message === 'Invalid key length'
const decryptionFailed = error.message === 'Unsupported state or unable to authenticate data'
if (isRange || invalidKeyLength) {
const err = new Error('INVALID_DOTENV_KEY: It must be 64 characters long (or more)')
err.code = 'INVALID_DOTENV_KEY'
throw err
} else if (decryptionFailed) {
const err = new Error('DECRYPTION_FAILED: Please check your DOTENV_KEY')
err.code = 'DECRYPTION_FAILED'
throw err
} else {
throw error
}
}
}
// Populate process.env with parsed values
function populate (processEnv, parsed, options = {}) {
const debug = Boolean(options && options.debug)
const override = Boolean(options && options.override)
if (typeof parsed !== 'object') {
const err = new Error('OBJECT_REQUIRED: Please check the processEnv argument being passed to populate')
err.code = 'OBJECT_REQUIRED'
throw err
}
// Set process.env
for (const key of Object.keys(parsed)) {
if (Object.prototype.hasOwnProperty.call(processEnv, key)) {
if (override === true) {
processEnv[key] = parsed[key]
}
if (debug) {
if (override === true) {
_debug(`"${key}" is already defined and WAS overwritten`)
} else {
_debug(`"${key}" is already defined and was NOT overwritten`)
}
}
} else {
processEnv[key] = parsed[key]
}
}
}
const DotenvModule = {
configDotenv,
_configVault,
_parseVault,
config,
decrypt,
parse,
populate
}
module.exports.configDotenv = DotenvModule.configDotenv
module.exports._configVault = DotenvModule._configVault
module.exports._parseVault = DotenvModule._parseVault
module.exports.config = DotenvModule.config
module.exports.decrypt = DotenvModule.decrypt
module.exports.parse = DotenvModule.parse
module.exports.populate = DotenvModule.populate
module.exports = DotenvModule