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