gulp-s3-upload
A gulp task to asynchronous upload/update assets to an AWS S3 Bucket.
Last updated a year ago by clineamb .
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gulp-s3-upload

Version 1.7.3

Use for uploading assets to Amazon S3 servers. This helps to make it an easy gulp task.

This package uses the aws-sdk (node).

NPM / Changelog

See full details in the Changelog.

Install

npm install gulp-s3-upload

Usage

Including + Setting Up Config

    var gulp = require('gulp');
    var s3 = require('gulp-s3-upload')(config);

...where config is something like...

var config = {
    accessKeyId: "YOURACCESSKEY",
    secretAccessKey: "YOUACCESSSECRET"
}

//  ...or...

var config = JSON.parse(fs.readFileSync('private/awsaccess.json'));

//  ...or to use IAM settings...

var config = { useIAM: true };

// ...or to use IAM w/ S3 config settings ...

var s3 = require('gulp-s3-upload')(
    {useIAM:true},  // or {} / null
    { /* S3 Config */ }
);

The optional config argument can include any option available (like region) available in the AWS Config Constructor. By default all settings are undefined.

Per AWS best practices, the recommended approach for loading credentials is to use the shared credentials file (~/.aws/credentials). You can also set the aws_access_key_id and aws_secret_access_key environment variables or specify values directly in the gulpfile via the accessKeyId and secretAccessKey options.

If you want to use an AWS profile in your ~/.aws/credentials file just set the environment variable AWS_PROFILE with your profile name before invoking your gulp task:

AWS_PROFILE=myprofile gulp upload

If you are using IAM settings, just pass the noted config ({useIAM:true}) in order to default to using IAM. More information on using IAM settings here.

You can also use a node_module like config (+ js-yaml) to load config files in your gulpfile.js. You can also use fs.readFileSync to read from a local file to load your config.

Feel free to also include credentials straight into your gulpfile.js, though be careful about committing files with secret credentials in your projects!

Having AWS Key/Secrets may not be required by your AWS/IAM settings. Errors thrown by the request should give your permission errors.

Gulp Task

The s3 plugin can take a second object parameter that exposes the options hash for the AWS S3 Constructor Property. Please note, if you have different configurations for different upload sets, you'll need to make a different task for each set. You won't need the accessKeyId and secret since the plugin initially takes those in for the AWS Constructor.

Create a task.

gulp.task("upload", function() {
    gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'your-bucket-name', //  Required
            ACL:    'public-read'       //  Needs to be user-defined
        }, {
            // S3 Constructor Options, ie:
            maxRetries: 5
        }))
    ;
});

Options

Bucket (bucket) (required)

Type: string

The bucket that the files will be uploaded to.

Other available options are the same as the ones found in the AWS-SDK docs for S3. The end of the readme below for a list of availble AWS-SDK resources that this plugin constantly references.

NOTE: Key, Body, and ContentType are the only options availble in putObject that do NOT need to be defined because the gulp will handle these for you. If these are defined, the plugin will filter them out.

gulp-s3-plugin options

charset

Type: string

Use this to add a charset to the mimetype. "charset=[CHARSET]" gets appended to the mimetype if this is defined.

etag_hash

Type: string

Default: 'md5'

Use this to change the hashing of the files' ETags. The default is MD5. More information on AWS's Common Response Headers can be found here. You shouldn't have to change this, but AWS says the "ETag may or may not be an MD5 diest of the object data", so this option has been implemented should any other case arise.

keyTransform (nameTransform)

Type: function

Use this to transform your file names before they're uploaded to your S3 bucket. (Previously known as name_transform).

    gulp.task("upload_transform", function() {
        gulp.src("./dir/to/upload/**")
            .pipe(s3({
                Bucket: 'example-bucket',
                ACL: 'public-read',
                keyTransform: function(relative_filename) {
                    var new_name = changeFileName(relative_filename);
                    // or do whatever you want
                    return new_name;
                }
            }))
        ;
    });

maps.ParamName {}

Type: object + function

Upon reviewing an issue with metadataMap and manualContentEncoding, a standard method for mapping each s3.putObject param was created. For now, metadataMap and manualContentEncoding are still available, but they will be depricated in the next major version (2.0).

Each property of the maps option must be a function and must match the paramter being mapped. The files' keyname will be passed through (keep in mind, this is after any keyTransform calls). The function should return the output S3 expects. You can find more information and the available options here.

For example, to define metadataMap and separate expirations in this way:

    var metadata_collection = { /* your info here */ };
    var expirations = { /* your info here */ };

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            maps: {
                Metadata: function(keyname) {
                    path.basename(keyname); // just get the filename
                    return metadata_collection[keyname]; // return an object
                },
                Expires: function(keyname) {
                     path.basename(keyname); // just get the filename
                     return new Date(expirations[keyname]);
                }
            }
        }));
    });

If anything but a function is passed through, nothing will happen. If you want to send a consistent value to all of your files this way, just simply set the option straight in the main options like so:

    var expires = new Date();
    expires.setUTCFullYear(2020);

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            Metadata: {
                "example1": "This is an example"
            },
            Expires: expires
        }));
    });

metadataMap

NOTE: It is preferred you use the maps.ParamsName method to define and map specific metadata to files. Also, if you set both maps.Metadata and this, metadataMap will take precedence.

Type: object or function

If you have constant metadata you want to attach to each object, just define the object, and it will be included to each file object being upload.

If you wish to change it per object, you can pass a function through to modify the metadata based on the (transformed) keyname.

Example (passing an object):

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            metadataMap: {
                "uploadedVia": "gulp-s3-upload",
                "exampleFlag":  "Asset Flag"
            }
        }));
    });

Passing the s3.putObject param option Metadata is effectively the same thingas passing an object to metadataMap. Metadata is defined and metadataMap is not it will use the object passed to Metadata as metadata for all the files that will be uploaded. If both Metadata and metadataMap are defined, Metadata will take precedence and be added to each file being uploaded.

Example (passing a function):

    // ... setup gulp-s3-upload ...
    var path = require('path');
    var metadata_collection = {
        "file1.txt": {
            "uploadedVia": "gulp-s3-upload",
            "example": "Example Data"
        },
        "file2.html": {
            "uploadedVia": "gulp-s3-upload"
        }
    };

    gulp.task("uploadWithMeta", function() {
        gulp.src("./upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            metadataMap: function(keyname) {
                path.basename(keyname); // just get the filename
                return metadata_collection[keyname]; // return an object
            }
        }));
    });

When passing a function, it's important to note that the file will already be transformed either by the keyTransform you defined or by the default function which creates a keyname relative to your S3 bucket, e.g. you can get "example.txt" or "docs/example.txt" depending on how it was structured locally (hence why in the example, the path module is used to just get the filename).

Note: You should be responsible for handling mismatching/unmatched keynames to the metadata you're mapping.

mimeTypeLookup

Type: function

Use this to transform what the key that is used to match the MIME type when uploading to S3.

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            mimeTypeLookup: function(original_keyname) {
                return original_keyname.replace('.gz', ''); // ignore gzip extension
            },
        }));
    });

manualContentEncoding

NOTE: It is preferred you use the maps.ParamsName method to define and map specific Content Encoding values to files. If you set both maps.ContentEncoding and manualContentEncoding, manualContentEncoding will take priority.

Type: string or function

If you want to add a custom content-encoding header on a per file basis, you can define a function that determines the content encoding based on the keyname. Defining a string is like passing the s3.putObject param option ContentEncoding.

Example (passing a string):

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            manualContentEncoding: 'gzip'
        }));
    });

Example (passing a function):

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            manualContentEncoding: function(keyname) {
                var contentEncoding = null;

                if (keyname.indexOf('.gz') !== -1) {
                  contentEncoding = 'gzip';
                }
                return contentEncoding;
            }
        }));
    });

Post-Upload Callbacks

onChange

Type: function

This function gets called with the S3 keyname as the first parameter if the uploaded file resulted in a change. Note the keyname passed is after any keyTransform modifications.

Example:

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**")
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read',
            onChange: function(keyname) {
                logChangedFiles(keyname);   // or whatever you want
            }
        }));
    });
onNoChange

Type: function

This function gets called with the S3 keyname as the first parameter if the uploaded file did not result in a change, much like onChange.

onNew

Type: function

This function gets called with the S3 keyname as the first parameter if the uploaded file is a new file in the bucket, much like onChange.

uploadNewFilesOnly

Type: boolean

Set uploadNewFilesOnly: true if you only want to upload new files and not overwrite existing ones.

Stream Support

When uploading large files you may want to use gulp.src without buffers. Normally this plugin calculates an ETag hash of the contents and compares that to the existing files in the bucket. However, when using streams, we can't do this comparison.

Furthermore, the AWS SDK requires us to have a ContentLength in bytes of contents uploaded as a stream. This means streams are currently only supported for gulp sources that indicate the file size in file.stat.size, which is automatic when using a file system source.

Example:

    gulp.task("upload", function() {
        gulp.src("./dir/to/upload/**", {buffer:false}) // buffer:false for streams
        .pipe(s3({
            Bucket: 'example-bucket',
            ACL: 'public-read'
        }));
    });

Added by @algesten

AWS-SDK References


License

Copyright (c) 2015, Caroline Amaba

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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