NOTE: This is the README for grunt-s3 v0.2.0-alpha. For v0.1.0, go here.

Grunt 0.4.x + Amazon S3

About

Amazon S3 is a great tool for storing/serving data. Thus, there is a chance it is part of your build process. This task can help you automate uploading/downloading files to/from Amazon S3. All file transfers are verified and will produce errors if incomplete.

Dependencies

• knox
• mime
• async
• underscore
• underscore.deferred

Installation

npm install grunt-s3 --save-dev

Then add this line to your project's Gruntfile.js:

grunt.loadNpmTasks('grunt-s3');

Options

The grunt-s3 task is now a multi-task; meaning you can specify different targets for this task to run as.

A quick reference of options

• key - (string) An Amazon S3 credentials key
• secret - (string) An Amazon S3 credentials secret
• bucket - (string) An Amazon S3 bucket
• region - (string) An Amazon AWS region (see http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region)
• maxOperations - (number) max number of concurrent transfers - if not specified or set to 0, will be unlimited.
• encodePaths - (boolean) if set to true, will encode the uris of destinations to prevent 505 errors. Default: false
• headers - (object) An object containing any headers you would like to send along with the transfers i.e. { 'X-Awesomeness': 'Out-Of-This-World', 'X-Stuff': 'And Things!' }
• access - (string) A specific Amazon S3 ACL. Available values: private, public-read, public-read-write, authenticated-read, bucket-owner-read, bucket-owner-full-control
• gzip - (boolean) If true, uploads will be gzip-encoded.
• gzipExclude - (array) Define extensions of files you don't want to run gzip on, an array of strings ie: ['.jpg', '.jpeg', '.png'].
• upload - (array) An array of objects, each object representing a file upload and containing a src and a dest. Any of the above values may also be overriden. Passing rel:DIR will cause the filesnames to be expanded so that wild cards are not passed to the source name.
• download - (array) An array of objects, each object representing a file download and containing a src and a dest. Any of the above values may also be overriden.
• del - (array) An array of objects, each object containing a src to delete from s3. Any of the above values may also be overriden.
• sync - (array) An array of ojects, each oject containing a src and dest. Default behavior is to only upload new files (that don't exist). Adding verify:true forces an MD5 hash and Modified time check prior to overwriting the server files.
• debug - (boolean) If true, no transfers with S3 will occur, will print all actions for review by user

Example

Template strings in grunt will allow you to easily include values from other files. The below example demonstrates loading aws settings from another file, Where grunt-aws.json is just a json key:value file like package.json. (Special thanks to @nanek)

This is important because you should never check in your S3 credentials to github! Load them from an external file that is outside of the repo.

grunt.initConfig({
  aws: grunt.file.readJSON('~/grunt-aws.json'),
  s3: {
    options: {
      key: '<%= aws.key %>',
      secret: '<%= aws.secret %>',
      bucket: '<%= aws.bucket %>',
      access: 'public-read',
      headers: {
        // Two Year cache policy (1000 * 60 * 60 * 24 * 730)
        "Cache-Control": "max-age=630720000, public",
        "Expires": new Date(Date.now() + 63072000000).toUTCString()
      }
    },
    dev: {
      // These options override the defaults
      options: {
        encodePaths: true,
        maxOperations: 20
      },
      // Files to be uploaded.
      upload: [
        {
          src: 'important_document.txt',
          dest: 'documents/important.txt',
          options: { gzip: true }
        },
        {
          src: 'passwords.txt',
          dest: 'documents/ignore.txt',

          // These values will override the above settings.
          bucket: 'some-specific-bucket',
          access: 'authenticated-read'
        },
        {
          // Wildcards are valid *for uploads only* until I figure out a good implementation
          // for downloads.
          src: 'documents/*.txt',

          // But if you use wildcards, make sure your destination is a directory.
          dest: 'documents/'
        }
      ],

      // Files to be downloaded.
      download: [
        {
          src: 'documents/important.txt',
          dest: 'important_document_download.txt'
        },
        {
          src: 'garbage/IGNORE.txt',
          dest: 'passwords_download.txt'
        }
      ],

      del: [
        {
          src: 'documents/launch_codes.txt'
        },
        {
          src: 'documents/backup_plan.txt'
        }
      ],

      sync: [
        {
          // only upload this document if it does not exist already
          src: 'important_document.txt',
          dest: 'documents/important.txt',
          options: { gzip: true }
        },
        {
          // make sure this document is newer than the one on S3 and replace it
          verify: true,
          src: 'passwords.txt',
          dest: 'documents/ignore.txt'
        },
        {
          src: path.join(variable.to.release, "build/cdn/js/**/*.js"),
          dest: "jsgz",
          // make sure the wildcard paths are fully expanded in the dest
          rel: path.join(variable.to.release, "build/cdn/js"),
          options: { gzip: true }
        }
      ]
    }

  }

});

Running grunt s3 using the above config produces the following output:

$ grunt s3
Running "s3" task
>> ↙ Downloaded: documents/important.txt (e704f1f4bec2d17f09a0e08fecc6cada)
>> ↙ Downloaded: garbage/IGNORE.txt (04f7cb4c893b2700e4fa8787769508e8)
>> ↗ Uploaded: documents/document1.txt (04f7cb4c893b2700e4fa8787769508e8)
>> ↗ Uploaded: passwords.txt (04f7cb4c893b2700e4fa8787769508e8)
>> ↗ Uploaded: important_document.txt (e704f1f4bec2d17f09a0e08fecc6cada)
>> ↗ Uploaded: documents/document2.txt (04f7cb4c893b2700e4fa8787769508e8)
>> ✗ Deleted: documents/launch_codes.txt
>> ✗ Deleted: documents/backup_plan.txt
Done, without errors.

Alternative ways of including your s3 configuration

Environment variables

If you do not pass in a key and secret with your config, grunt-s3 will fallback to the following environment variables:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY

Helpers

Helpers have been removed from Grunt 0.4 to access these methods directly. You can now require the s3 library files directly like so:

var s3 = require('grunt-s3').helpers;

Make sure you explicitly pass the options into the method. If you've used grunt.initConfig() you can use grunt.config.get('s3') to access them.

s3.upload(src, dest, options)

Upload a file to s3. Returns a Promises/J-style Deferred object.

src (required) - The path to the file to be uploaded. Accepts wildcards, i.e. files/*.txt

dest (required) - The path on s3 where the file will be uploaded, relative to the bucket. If you use a wildcard for src, this should be a directory.

options (optional) - An object containing any of the following values. These values override any values specified in the main config.

• key - An Amazon S3 credentials key
• secret - An Amazon S3 credentials secret
• bucket - An Amazon S3 bucket
• headers - An object containing any headers you would like to send along with the upload.
• access - A specific Amazon S3 ACL. Available values: private, public-read, public-read-write, authenticated-read, bucket-owner-read, bucket-owner-full-control
• gzip - (boolean) If true, uploads will be gzip-encoded.

s3.download(src, dest, options)

Download a file from s3. Returns a Promises/J-style Deferred object.

src (required) - The path on S3 from which the file will be downloaded, relative to the bucket. Does not accept wildcards

dest (required) - The local path where the file will be saved.

options (optional) - An object containing any of the following values. These values override any values specified in the main config.

• key - An Amazon S3 credentials key
• secret - An Amazon S3 credentials secret
• bucket - An Amazon S3 bucket
• headers - An object containing any headers you would like to send along with the upload.

s3.delete(src, options)

Delete a file from s3. Returns a Promises/J-style Deferred object.

src (required) - The path on S3 of the file to delete, relative to the bucket. Does not accept wildcards

options (optional) - An object containing any of the following values. These values override any values specified in the main config.

• key - An Amazon S3 credentials key
• secret - An Amazon S3 credentials secret
• bucket - An Amazon S3 bucket
• headers - An object containing any headers you would like to send along with the upload.

Examples

var upload = s3.upload('dist/my-app-1.0.0.tar.gz', 'archive/my-app-1.0.0.tar.gz');

upload
  .done(function(msg) {
    console.log(msg);
  })
  .fail(function(err) {
    console.log(err);
  })
  .always(function() {
    console.log('dance!');
  });

var download = s3.download('dist/my-app-0.9.9.tar.gz', 'local/my-app-0.9.9.tar.gz');

download.done(function() {
  s3.delete('dist/my-app-0.9.9.tar.gz');
});

Changelog

v0.1.0

• Update to be compatible with grunt version 0.4.x.

v0.0.9

• Bump version of knox to 0.4.1.

v0.0.6

• Bump version of underscore.deferred to 0.1.4. Version 0.1.3 would fail to install sometimes due to there being two versions of the module with different capitalizations in npm.