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/* @flow */
/*::
type DotenvParseOptions = {
debug?: boolean
}
// keys and values from src
type DotenvParseOutput = { [string]: string }
type DotenvConfigOptions = {
path?: string, // path to .env file
encoding?: string, // encoding of .env file
debug?: string // turn on logging for debugging purposes
}
type DotenvConfigOutput = {
parsed?: DotenvParseOutput,
error?: Error
}
*/
const fs = require('fs')
const path = require('path')
function log (message /*: string */) {
console.log(`[dotenv][DEBUG] ${message}`)
}
const NEWLINE = '\n'
const RE_INI_KEY_VAL = /^\s*([\w.-]+)\s*=\s*(.*)?\s*$/
const RE_NEWLINES = /\\n/g
// Parses src into an Object
function parse (src /*: string | Buffer */, options /*: ?DotenvParseOptions */) /*: DotenvParseOutput */ {
const debug = Boolean(options && options.debug)
const obj = {}
// convert Buffers before splitting into lines and processing
src.toString().split(NEWLINE).forEach(function (line, idx) {
// matching "KEY' and 'VAL' in 'KEY=VAL'
const keyValueArr = line.match(RE_INI_KEY_VAL)
// matched?
if (keyValueArr != null) {
const key = keyValueArr[1]
// default undefined or missing values to empty string
let val = (keyValueArr[2] || '')
const end = val.length - 1
const isDoubleQuoted = val[0] === '"' && val[end] === '"'
const isSingleQuoted = val[0] === "'" && val[end] === "'"
// if single or double quoted, remove quotes
if (isSingleQuoted || isDoubleQuoted) {
val = val.substring(1, end)
// if double quoted, expand newlines
if (isDoubleQuoted) {
val = val.replace(RE_NEWLINES, NEWLINE)
}
} else {
// remove surrounding whitespace
val = val.trim()
}
obj[key] = val
} else if (debug) {
log(`did not match key and value when parsing line ${idx + 1}: ${line}`)
}
})
return obj
}
// Populates process.env from .env file
function config (options /*: ?DotenvConfigOptions */) /*: DotenvConfigOutput */ {
let dotenvPath = path.resolve(process.cwd(), '.env')
let encoding /*: string */ = 'utf8'
let debug = false
if (options) {
if (options.path != null) {
dotenvPath = options.path
}
if (options.encoding != null) {
encoding = options.encoding
}
if (options.debug != null) {
debug = true
}
}
try {
// specifying an encoding returns a string instead of a buffer
const parsed = parse(fs.readFileSync(dotenvPath, { encoding }), { debug })
Object.keys(parsed).forEach(function (key) {
if (!process.env.hasOwnProperty(key)) {
process.env[key] = parsed[key]
} else if (debug) {
log(`"${key}" is already defined in \`process.env\` and will not be overwritten`)
}
})
return { parsed }
} catch (e) {
return { error: e }
}
}
module.exports.config = config
module.exports.parse = parse