Careful-downloader NPM

🕵️‍♀️ careful-downloader

Downloads a file and its checksums to a temporary directory, validates the hash, and optionally extracts it if safe.

Install

npm install careful-downloader
# or...
yarn add careful-downloader

Usage

import downloader from "careful-downloader";

await downloader(
  "https://github.com/gohugoio/hugo/releases/download/v0.88.1/hugo_extended_0.88.1_Windows-64bit.zip",
  {
    checksumUrl: "https://github.com/gohugoio/hugo/releases/download/v0.88.1/hugo_0.88.1_checksums.txt",
    destDir: "vendor", // relative to process.cwd()
    algorithm: "sha256",
    extract: true,
  },
);
//=> '/Users/jake/src/carefully-downloaded/vendor/hugo.exe'

Instead of a checksumUrl, you can also simply provide a hash as a string via checksumHash:

import downloader from "careful-downloader";

await downloader(
  "https://github.com/gohugoio/hugo/releases/download/v0.88.1/hugo_extended_0.88.1_Windows-64bit.zip",
  {
    checksumHash: "aaa20e258cd668cff66400d365d73ddc375e44487692d49a5285b56330f6e6b2",
    destDir: "vendor",
    algorithm: "sha256",
    extract: false, // the default
  },
);
//=> '/Users/jake/src/carefully-downloaded/vendor/hugo_extended_0.88.1_Windows-64bit.zip'

API

downloader(downloadUrl, options)

downloadUrl

Type: string

Absolute URL to the desired file to download.

options

Type: object

checksumUrl

Type: string

Absolute URL to a checksums file, usually just a .txt containing filenames and hashes like this:

27493d1903a41e2dd47edc76a79918d95dfbb31474380d3704322e47ffd11b74  hugo_0.88.1_Windows-32bit.zip
ad81192d188cb584a73074d3dea9350d4609a13ed5fccaafd229b424247e5890  hugo_0.88.1_Windows-64bit.zip
aaa20e258cd668cff66400d365d73ddc375e44487692d49a5285b56330f6e6b2  hugo_extended_0.88.1_Windows-64bit.zip

Either this option or checksumHash is required.

checksumHash

Type: string

A single hash for the given downloaded file, e.g. abcd1234abcd1234abcd1234....

Either this option or checksumUrl is required.

filename

Type: string\ Default: Extracted from the download URL.

Manually set the filename of the download, helpful if the one provided by the server doesn't match the filename listed in the checksum file.

extract

Type: boolean\ Default: false

Use decompress to extract the final download to the destination directory (assuming it's a .zip, .tar, .tar.gz, etc.).

destDir

Type: string\ Default: "./downloads"

Directory path relative to module where the validated download is saved or extracted. Must be located within process.cwd() for security reasons.

cleanDestDir

Type: boolean\ Default: false

Delete any existing files in the destination directory before downloading.

algorithm

Type: string\ Default: "sha256"

The algorithm used by the checksum file. Available options are dependent on the version of OpenSSL on the platform. Examples are 'SHA1', 'SHA256', 'SHA512', 'MD5', etc.

On recent releases of OpenSSL, openssl list -digest-algorithms will display the available digest algorithms. Read more about crypto.createHash().