map/utils/dotenv.js

/*
Copyright (c) 2015, Scott Motte
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import fs from 'fs';
import path from 'path';
import os from 'os';

const version = "dotenv v16.0.3"

const LINE = /(?:^|^)\s*(?:export\s+)?([\w.-]+)(?:\s*=\s*?|:\s+?)(\s*'(?:\\'|[^'])*'|\s*"(?:\\"|[^"])*"|\s*`(?:\\`|[^`])*`|[^#\r\n]+)?\s*(?:#.*)?(?:$|$)/mg

// Parser 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 _log (message) {
    console.log(`[dotenv@${version}][DEBUG] ${message}`)
}

function _resolveHome (envPath) {
    return envPath[0] === '~' ? path.join(os.homedir(), envPath.slice(1)) : envPath
}

// Populates process.env from .env file
function config (options) {
    let dotenvPath = path.resolve(process.cwd(), '.env')
    let encoding = 'utf8'
    const debug = Boolean(options && options.debug)
    const override = Boolean(options && options.override)

    if (options) {
        if (options.path != null) {
            dotenvPath = _resolveHome(options.path)
        }
        if (options.encoding != null) {
            encoding = options.encoding
        }
    }

    try {
        // Specifying an encoding returns a string instead of a buffer
        const parsed = DotenvModule.parse(fs.readFileSync(dotenvPath, { encoding }))

        Object.keys(parsed).forEach(function (key) {
            if (!Object.prototype.hasOwnProperty.call(process.env, key)) {
                process.env[key] = parsed[key]
            } else {
                if (override === true) {
                    process.env[key] = parsed[key]
                }

                if (debug) {
                    if (override === true) {
                        _log(`"${key}" is already defined in \`process.env\` and WAS overwritten`)
                    } else {
                        _log(`"${key}" is already defined in \`process.env\` and was NOT overwritten`)
                    }
                }
            }
        })

        return { parsed }
    } catch (e) {
        if (debug) {
            _log(`Failed to load ${dotenvPath} ${e.message}`)
        }

        return { error: e }
    }
}

const DotenvModule = {
    config,
    parse
}

export default DotenvModule