Shrine

Shrine is a toolkit for file attachments in Ruby applications. Some highlights:

Modular design – the plugin system allows you to load only the functionality you need
Memory friendly – streaming uploads and downloads make it work great with large files
Cloud storage – store files on disk, AWS S3, Google Cloud, Cloudinary and others
ORM integrations – works with Sequel, ActiveRecord, Hanami::Model and Mongoid
Flexible processing – generate thumbnails with ImageMagick or libvips using the ImageProcessing gem
Metadata validation – validate files based on extracted metadata
Direct uploads – upload asynchronously to your app or to the cloud using Uppy
Resumable uploads – make large file uploads resumable by pointing Uppy to a resumable endpoint
Background jobs – built-in support for background processing that supports any backgrounding library

If you're curious how it compares to other file attachment libraries, see the Advantages of Shrine.

Resources

Documentation: shrinerb.com
Demo code: Roda / Rails
Source: github.com/shrinerb/shrine
Bugs: github.com/shrinerb/shrine/issues
Help & Discussion: groups.google.com/group/ruby-shrine

Quick start

Add Shrine to the Gemfile and write an initializer which sets up the storage and loads the ORM plugin:

# Gemfile
gem "shrine", "~> 2.0"

require "shrine"
require "shrine/storage/file_system"

Shrine.storages = {
  cache: Shrine::Storage::FileSystem.new("public", prefix: "uploads/cache"), # temporary
  store: Shrine::Storage::FileSystem.new("public", prefix: "uploads"),       # permanent
}

Shrine.plugin :sequel # or :activerecord
Shrine.plugin :cached_attachment_data # for retaining the cached file across form redisplays
Shrine.plugin :restore_cached_data # re-extract metadata when attaching a cached file
Shrine.plugin :rack_file # for non-Rails apps

Next decide how you will name the attachment attribute on your model, and run a migration that adds an <attachment>_data text or JSON column, which Shrine will use to store all information about the attachment:

Sequel.migration do                           # class AddImageDataToPhotos < ActiveRecord::Migration
  change do                                   #   def change
    add_column :photos, :image_data, :text    #     add_column :photos, :image_data, :text
  end                                         #   end
end                                           # end

Now you can create an uploader class for the type of files you want to upload, and add a virtual attribute for handling attachments using this uploader to your model:

class ImageUploader < Shrine
  # plugins and uploading logic
end

class Photo < Sequel::Model # ActiveRecord::Base
  include ImageUploader::Attachment.new(:image) # adds an `image` virtual attribute
end

Let's now add the form fields which will use this virtual attribute. We need (1) a file field for choosing files, and (2) a hidden field for retaining the uploaded file in case of validation errors and for potential direct uploads.

# with Forme:
form @photo, action: "/photos", enctype: "multipart/form-data" do |f|
  f.input :image, type: :hidden, value: @photo.cached_image_data
  f.input :image, type: :file
  f.button "Create"
end

# with Rails form builder:
form_for @photo do |f|
  f.hidden_field :image, value: @photo.cached_image_data
  f.file_field :image
  f.submit
end

# with Simple Form:
simple_form_for @photo do |f|
  f.input :image, as: :hidden, input_html: { value: @photo.cached_image_data }
  f.input :image, as: :file
  f.button :submit
end

Note that the file field needs to go after the hidden field, so that selecting a new file can always override the cached file in the hidden field. Also notice the enctype="multipart/form-data" HTML attribute, which is required for submitting files through the form; the Rails form builder will automatically generate this for you.

Now in your router/controller the attachment request parameter can be assigned to the model like any other attribute:

post "/photos" do
  Photo.create(params[:photo])
  # ...
end

Once a file is uploaded and attached to the record, you can retrieve a URL to the uploaded file with #<attachment>_url and display it on the page:

image_tag @photo.image_url

Storage

A "storage" in Shrine is an object responsible for managing files on a specific storage service (disk, AWS S3, Google Cloud etc), which implements a generic method interface. Storages are configured directly and registered under a name in Shrine.storages, so that they can later be used by uploaders.

# Gemfile
gem "aws-sdk-s3", "~> 1.2" # for AWS S3 storage

require "shrine/storage/s3"

s3_options = {
  bucket:            "my-bucket", # required
  access_key_id:     "abc",
  secret_access_key: "xyz",
  region:            "my-region",
}

Shrine.storages = {
  cache: Shrine::Storage::S3.new(prefix: "cache", **s3_options),
  store: Shrine::Storage::S3.new(**s3_options),
}

The above example sets up AWS S3 storage both for temporary and permanent storage, which is suitable for direct uploads. The :cache and :store names are special only in terms that the attacher will automatically pick them up, but you can also register more storages under different names.

Shrine ships with FileSystem and S3 storage, take a look at their documentation for more details on various features they support. There are many more Shrine storages provided by external gems, and you can also create your own storage.

Uploader

Uploaders are subclasses of Shrine, and are essentially wrappers around storages. They perform common tasks around upload that aren't related to a particular storage.

class ImageUploader < Shrine
  # image attachent logic
end

uploader = ImageUploader.new(:store)
uploader #=> uploader for storage registered under `:store`

It's common to create an uploader for each type of file that you want to handle (image, video, audio, document etc), but really you can organize them in any way you like.

Uploading

The main method of the uploader is #upload, which takes an IO-like object on the input, and returns a representation of the uploaded file on the output.

uploaded_file = uploader.upload(file)
uploaded_file #=> #<Shrine::UploadedFile>

Some of the tasks performed by #upload include:

file processing (if defined)
extracting metadata
generating location
uploading (this is where the storage is called)
closing the uploaded file

IO abstraction

Shrine is able to upload any IO-like object that responds to #read, #rewind, #eof? and #close. This includes built-in IO and IO-like objects like File, Tempfile and StringIO.

When a file is uploaded to a Rails app, it will be represented by an ActionDispatch::Http::UploadedFile object in the params. This is also an IO-like object accepted by Shrine. In other Rack applications the uploaded file will be represented as a Hash, but it can still be attached when rack_file plugin is loaded.

Here are some examples of IO objects that can be uploaded:

uploader.upload File.open("/path/to/file", "rb")             # upload from disk
uploader.upload StringIO.new("file content")                 # upload from memory
uploader.upload ActionDispatch::Http::UploadedFile.new       # upload from Rails controller
uploader.upload Shrine.rack_file({ tempfile: Tempfile.new }) # upload from Rack controller
uploader.upload Rack::Test::UploadedFile.new                 # upload from rack-test
uploader.upload Down.open("https://example.org/file")        # upload from internet

Shrine::UploadedFile, the object returned after upload, is itself an IO-like object as well. This makes it trivial to reupload a file from one storage to another, and this is used by the attacher to reupload a file stored on temporary storage to permanent storage.

Uploaded file

The Shrine::UploadedFile object represents the file that was uploaded to the storage, and it's what's returned from Shrine#upload or when retrieving a record attachment. It contains the following information:

storage – identifier of the storage the file was uploaded to
id – location of the file on the storage
metadata – file metadata that was extracted before upload

uploaded_file = uploader.upload(file)

uploaded_file.id       #=> "949sdjg834.jpg"
uploaded_file.storage  #=> #<Shrine::Storage::FileSystem>
uploaded_file.metadata #=> {...}

# It can be serialized into JSON and saved to a database column
uploaded_file.to_json  #=> '{"id":"949sdjg834.jpg","storage":"store","metadata":{...}}'

It comes with many convenient methods that delegate to the storage:

uploaded_file.url                 #=> "https://my-bucket.s3.amazonaws.com/949sdjg834.jpg"
uploaded_file.open                # opens the uploaded file
uploaded_file.download            #=> #<File:/var/folders/.../20180302-33119-1h1vjbq.jpg>
uploaded_file.stream(destination) # streams uploaded content into a writable destination
uploaded_file.exists?             #=> true
uploaded_file.delete              # deletes the file from the storage

# open/download the uploaded file for the duration of the block
uploaded_file.open     { |io| io.read }
uploaded_file.download { |tempfile| tempfile.read }

It also implements the IO-like interface that conforms to Shrine's IO abstraction, which allows it to be uploaded again to other storages.

uploaded_file.read   # returns content of the uploaded file
uploaded_file.eof?   # returns true if the whole IO was read
uploaded_file.rewind # rewinds the IO
uploaded_file.close  # closes the IO

If you want to retrieve the content of the uploaded file, you can use a combination of #open and #read:

uploaded_file.open(&:read) #=> "..." (binary content of the uploaded file)

Attachment

Storages, uploaders, and uploaded file objects are the main components for managing files. Since most often you also want to attach the uploaded files to database records, Shrine comes with a high-level attachment interface, which uses these components internally.

Usually you're using an ORM for saving database records, in which case you can load an additional plugin to automatically tie the attached files to record lifecycle. But you can also use Shrine just with plain models.

Shrine.plugin :sequel # :activerecord

class Photo < Sequel::Model # ActiveRecord::Base
  include ImageUploader::Attachment.new(:image) #
  include ImageUploader.attachment(:image)      # these are all equivalent
  include ImageUploader[:image]                 #
end

You can choose whichever of these three syntaxes you prefer. Either of these will create a Shrine::Attachment module with attachment methods for the specified attribute, which then get added to your model when you include it:

#image= – uploads the file to temporary storage and serializes the result into image_data
#image – returns Shrine::UploadedFile instantiated from image_data
#image_url – calls url on the attachment if it's present, otherwise returns nil
#image_attacher – returns instance of Shrine::Attacher which handles the attaching

The ORM plugin that we loaded adds appropriate callbacks, so when record is saved the attachment is uploaded to permanent storage, and when record is deleted the attachment is deleted as well.

# no file is attached
photo.image #=> nil

# the assigned file is cached to temporary storage and written to `image_data` column
photo.image = File.open("waterfall.jpg")
photo.image      #=> #<Shrine::UploadedFile @data={...}>
photo.image_url  #=> "/uploads/cache/0sdfllasfi842.jpg"
photo.image_data #=> '{"id":"0sdfllasfi842.jpg","storage":"cache","metadata":{...}}'

# the cached file is promoted to permanent storage and saved to `image_data` column
photo.save
photo.image      #=> #<Shrine::UploadedFile @data={...}>
photo.image_url  #=> "/uploads/store/l02kladf8jlda.jpg"
photo.image_data #=> '{"id":"l02kladf8jlda.jpg","storage":"store","metadata":{...}}'

# the attached file is deleted with the record
photo.destroy
photo.image.exists? #=> false

If there is already a file attached and a new file is attached, the previous attachment will get deleted when the record gets saved.

photo.update(image: new_file) # changes the attachment and deletes previous
# or
photo.update(image: nil)      # removes the attachment and deletes previous

In addition to assigning raw files, you can also assign a JSON representation of files that are already uploaded to the temporary storage. This allows Shrine to retain cached files in case of validation errors and handle [direct uploads] via the hidden form field.

photo.image = '{"id":"9260ea09d8effd.jpg","storage":"cache","metadata":{...}}'

Attacher

The model attachment attributes and callbacks just delegate the behaviour to ther underlying Shrine::Attacher object.

photo.image_attacher #=> #<Shrine::Attacher>

The Shrine::Attacher object can be instantiated and used directly:

attacher = ImageUploader::Attacher.new(photo, :image)

attacher.assign(file) # equivalent to `photo.image = file`
attacher.get          # equivalent to `photo.image`
attacher.url          # equivalent to `photo.image_url`

The attacher is what drives attaching files to model instances, and it functions independently from models' attachment interface. This means that you can use it as an alternative, in case you prefer not to add additional attributes to the model, or prefer explicitness over callbacks. It's also useful when you need something more advanced which isn't available through the attachment attributes.

The Shrine::Attacher by default uses :cache for temporary and :store for permanent storage, but you can specify a different storage:

ImageUploader::Attacher.new(photo, :image, cache: :other_cache, store: :other_store)

# OR

photo.image_attacher(cache: :other_cache, store: :other_store)
photo.image = file # uploads to :other_cache storage
photo.save         # promotes to :other_store storage

Whenever the attacher uploads or deletes files, it sends a context hash which includes :record, :name, and :action keys, so that you can perform processing or generate location differently depending on this information. See "Context" section for more details.

For more information about Shrine::Attacher, see the Using Attacher guide.

Plugin system

By default Shrine comes with a small core which provides only the essential functionality. All additional features are available via plugins, which also ship with Shrine. This way you can choose exactly what and how much Shrine does for you, and you load the code only for features that you use.

Shrine.plugin :logging # adds logging

Plugins add behaviour by extending Shrine core classes via module inclusion, and many of them also accept configuration options. The plugin system respects inheritance, so you can choose to load a plugin globally or per uploader.

class ImageUploader < Shrine
  plugin :store_dimensions # extract image dimensions only for this uploader and its descendants
end

If you want to extend Shrine functionality with custom behaviour, you can also create your own plugin.

Metadata

Shrine automatically extracts some basic file metadata and saves them to the Shrine::UploadedFile. You can access them through the #metadata hash or via metadata methods:

uploaded_file.metadata #=>
# {
#   "filename" => "matrix.mp4",
#   "mime_type" => "video/mp4",
#   "size" => 345993,
# }

uploaded_file.original_filename #=> "matrix.mp4"
uploaded_file.extension         #=> "mp4"
uploaded_file.mime_type         #=> "video/mp4"
uploaded_file.size              #=> 345993

MIME type

By default mime_type will be inherited from #content_type attribute of the uploaded file, which is set from the Content-Type request header. However, this header is determined by the browser solely based on the file extension. This means that by default Shrine's mime_type is not guaranteed to hold the actual MIME type of the file.

To remedy that, you can load the determine_mime_type plugin, which will make Shrine extract the MIME type from file content.

Shrine.plugin :determine_mime_type

photo = Photo.create(image: StringIO.new("<?php ... ?>"))
photo.image.mime_type #=> "text/x-php"

By the default the UNIX file utility is used to determine the MIME type, but you can also choose a different analyzer – see the plugin documentation for more details.

Custom metadata

In addition to size, filename, and mime_type, you can also extract image dimensions using the store_dimensions plugin, as well as any custom metadata using the add_metadata plugin. Check out the Extracting Metadata guide for more details.

Processing

Shrine's processing plugin allows you to intercept when the cached file is being uploaded to permanent storage, and do any file processing your might want.

If you're uploading images, it's common to want to generate various thumbnails. It's recommended to use the ImageProcessing gem for this, which provides a convenient API over ImageMagick and libvips. You also need to load the versions plugin to be able to save multiple files.

$ brew install imagemagick

# Gemfile
gem "image_processing", "~> 1.0"

require "image_processing/mini_magick"

class ImageUploader < Shrine
  plugin :processing # allows hooking into promoting
  plugin :versions   # enable Shrine to handle a hash of files
  plugin :delete_raw # delete processed files after uploading

  process(:store) do |io, context|
    original = io.download
    pipeline = ImageProcessing::MiniMagick.source(original)

    size_800 = pipeline.resize_to_limit!(800, 800)
    size_500 = pipeline.resize_to_limit!(500, 500)
    size_300 = pipeline.resize_to_limit!(300, 300)

    original.close!

    { original: io, large: size_800, medium: size_500, small: size_300 }
  end
end

After these files have been uploaded, their data will all be saved to the <attachment>_data column. The attachment getter will then read them as a Hash of Shrine::UploadedFile objects.

photo.image_data #=>
# '{
#   "original": {"id":"9sd84.jpg", "storage":"store", "metadata":{...}},
#   "large": {"id":"lg043.jpg", "storage":"store", "metadata":{...}},
#   "medium": {"id":"kd9fk.jpg", "storage":"store", "metadata":{...}},
#   "small": {"id":"932fl.jpg", "storage":"store", "metadata":{...}}
# }'

photo.image #=>
# {
#   :original => #<Shrine::UploadedFile @data={"id"=>"9sd84.jpg", ...}>,
#   :large    => #<Shrine::UploadedFile @data={"id"=>"lg043.jpg", ...}>,
#   :medium   => #<Shrine::UploadedFile @data={"id"=>"kd9fk.jpg", ...}>,
#   :small    => #<Shrine::UploadedFile @data={"id"=>"932fl.jpg", ...}>,
# }

photo.image[:medium]           #=> #<Shrine::UploadedFile>
photo.image[:medium].url       #=> "/uploads/store/lg043.jpg"
photo.image[:medium].size      #=> 5825949
photo.image[:medium].mime_type #=> "image/jpeg"

The versions plugin also expands #<attachment>_url to accept version names:

photo.image_url(:large) #=> "https://..."

For more details, including examples of how to do custom processing, see the File Processing guide.

Context

The #upload (and #delete) methods accept a hash of options as the second argument, which is forwarded to all other tasks like processing, extracting metadata and generating location.

uploader.upload(file, { foo: "bar" }) # context hash is forwarded to all tasks around upload

Some options are actually recognized by Shrine, like :location and :upload_options, some are added by plugins, and the rest are there just to provide additional context, for more flexibility in performing tasks and more descriptive logging.

The attacher automatically includes additional context information for each upload and delete operation:

context[:record] – model instance where the file is attached
context[:name] – name of the attachment attribute on the model
context[:action] – identifier for the action being performed (:cache, :store, :recache, :backup, ...)

class VideoUploader < Shrine
  process(:store) do |io, context|
    trim_video(io, 300) if context[:record].user.free_plan?
  end
end

Validation

Shrine can perform file validations for files assigned to the model. The validations are defined inside the Attacher.validate block, and you can load the validation_helpers plugin to get convenient file validation methods:

class DocumentUploader < Shrine
  plugin :validation_helpers

  Attacher.validate do
    validate_max_size 5*1024*1024, message: "is too large (max is 5 MB)"
    validate_mime_type_inclusion %w[application/pdf]
  end
end

user = User.new
user.cv = File.open("cv.pdf")
user.valid? #=> false
user.errors.to_hash #=> {:cv=>["is too large (max is 5 MB)"]}

See the File Validation guide and validation_helpers plugin documentation for more details.

Location

Before Shrine uploads a file, it generates a random location for it. By default the hierarchy is flat; all files are stored in the root directory of the storage. The pretty_location plugin provides a nice default hierarchy, but you can also override #generate_location with a custom implementation:

class ImageUploader < Shrine
  def generate_location(io, context)
    type  = context[:record].class.name.downcase if context[:record]
    style = context[:version] == :original ? "originals" : "thumbs" if context[:version]
    name  = super # the default unique identifier

    [type, style, name].compact.join("/")
  end
end

uploads/
  photos/
    originals/
      la98lda74j3g.jpg
    thumbs/
      95kd8kafg80a.jpg
      ka8agiaf9gk4.jpg

Note that there should always be a random component in the location, so that the ORM dirty tracking is detected properly. Inside #generate_location you can also access the extracted metadata through context[:metadata].

When uploading single files, it's possible to bypass #generate_location via the uploader, by specifying :location:

uploader.upload(file, location: "some/specific/location.mp4")

Direct uploads

To really improve the user experience, it's recommended to start uploading the files asynchronously as soon they're selected. This way the UI is still responsive during upload, so the user can fill in other fields while the files are being uploaded, and if you display a progress bar they can see when the upload will finish.

The asynchronous uploads will have to go to a separate endpoint than the one where the form is submitted. You can use Shrine's upload_endpoint plugin to create a Rack app that accepts file uploads and forwards them to the specified storage. We want to set it up to upload to temporary storage (:cache), because we're replacing the caching step from the default synchronous workflow.

Shrine.plugin :upload_endpoint

# config.ru (Rack)
map "/images/upload" do
  run ImageUploader.upload_endpoint(:cache)
end

# OR

# config/routes.rb (Rails)
Rails.application.routes.draw do
  mount ImageUploader.upload_endpoint(:cache) => "/images/upload"
end

The above will add a POST /images/upload route to your app. You can now use the Uppy JavaScript library to upload files to this endpoint as soon they're selected, and write the result to the hidden field. The JavaScript code for this will depend on your application, see this walkthrough that adds direct uploads from scratch.

You can also upload files directly to the cloud (AWS S3, Google Cloud etc), using Shrine's presign_endpoint plugin. See this walkthrough that adds direct S3 uploads from scratch using Uppy, as well as the Direct Uploads to S3 guide that provides some useful tips. Also check out the Roda or Rails demo app which implements multiple uploads directly to S3.

Resumable uploads

When your app is dealing with large uploads (e.g. videos), keep in mind that it can be challening for your users to upload these large files to your app. Many users might not have a great internet connection, and if it happens to break at any point during uploading, they would need to restart the upload from the beginning.

Luckily, there is a solution for this. Tus.io is an open protocol for resumable file uploads, which enables the client and the server to achieve reliable file uploads even on unstable connections, by enabling the upload to be resumed in case of interruptions, even after the browser was closed or the device was shut down.

On the client side you can use Uppy with tus-js-client, have it upload files to a tus-ruby-server, and finally attach the uploaded files with the help of shrine-tus. See this walkthrough that adds resumable uploads from scratch, as well as the Roda demo for a complete example.

Backgrounding

Shrine is the first file attachment library designed for backgrounding support. Moving phases of managing file attachments to background jobs is essential for scaling and good user experience, and Shrine provides a backgrounding plugin which makes it easy to plug in your favourite backgrounding library:

Shrine.plugin :backgrounding
Shrine::Attacher.promote { |data| PromoteJob.perform_async(data) }
Shrine::Attacher.delete { |data| DeleteJob.perform_async(data) }

class PromoteJob
  include Sidekiq::Worker
  def perform(data)
    Shrine::Attacher.promote(data)
  end
end

class DeleteJob
  include Sidekiq::Worker
  def perform(data)
    Shrine::Attacher.delete(data)
  end
end

The above puts promoting (uploading cached file to permanent storage) and deleting of files for all uploaders into background jobs using Sidekiq. Obviously instead of Sidekiq you can use any other backgrounding library.

Clearing cache

Shrine doesn't automatically delete files uploaded to temporary storage, instead you should set up a separate recurring task that will automatically delete old cached files.

Most of Shrine storage classes come with a #clear! method, which you can call in a recurring script. For FileSystem and S3 storage it would look like this:

# FileSystem storage
file_system = Shrine.storages[:cache]
file_system.clear!(older_than: Time.now - 7*24*60*60) # delete files older than 1 week

# S3 storage
s3 = Shrine.storages[:cache]
s3.clear! { |object| object.last_modified < Time.now - 7*24*60*60 } # delete files older than 1 week

Note that for AWS S3 you can also configure bucket lifecycle rules to do this for you. This can be done either from the AWS Console or via an API call:

require "aws-sdk-s3"

client = Aws::S3::Client.new(
  access_key_id:     "<YOUR KEY>",
  secret_access_key: "<YOUR SECRET>",
  region:            "<REGION>",
)

client.put_bucket_lifecycle_configuration(
  bucket: "<YOUR BUCKET>",
  lifecycle_configuration: {
    rules: [{
      expiration: { days: 7 },
      filter: { prefix: "cache/" },
      id: "cache-clear",
      status: "Enabled"
    }]
  }
)

Logging

Shrine ships with the logging which automatically logs processing, uploading, and deleting of files. This can be very helpful for debugging and performance monitoring.

Shrine.plugin :logging

2015-10-09T20:06:06.676Z #25602: STORE[cache] ImageUploader[:avatar] User[29543] 1 file (0.1s)
2015-10-09T20:06:06.854Z #25602: PROCESS[store]: ImageUploader[:avatar] User[29543] 1-3 files (0.22s)
2015-10-09T20:06:07.133Z #25602: DELETE[destroyed]: ImageUploader[:avatar] User[29543] 3 files (0.07s)

Settings

Each uploader can store generic settings in the opts hash, which can be accessed in other uploader actions. You can store there anything that you find convenient.

Shrine.opts[:type] = "file"

class DocumentUploader < Shrine; end
class ImageUploader < Shrine
  opts[:type] = "image"
end

DocumentUploader.opts[:type] #=> "file"
ImageUploader.opts[:type]    #=> "image"

Because opts is cloned in subclasses, overriding settings works with inheritance. The opts hash is used internally by plugins to store configuration.

Inspiration

Shrine was heavily inspired by Refile and Roda. From Refile it borrows the idea of "backends" (here named "storages"), attachment interface, and direct uploads. From Roda it borrows the implementation of an extensible plugin system.

Similar libraries

Paperclip
CarrierWave
Dragonfly
Refile
Active Storage

Code of Conduct

Everyone interacting in the Shrine project’s codebases, issue trackers, and mailing lists is expected to follow the Shrine code of conduct.

License

The gem is available as open source under the terms of the MIT License.

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lib		lib
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CHANGELOG.md		CHANGELOG.md
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
Gemfile		Gemfile
ISSUE_TEMPLATE.md		ISSUE_TEMPLATE.md
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