Shrine is a toolkit for file attachments in Crystal applications. Heavily inspired by Shrine for Ruby.
https://jetrockets.github.io/shrine.cr
-
Add the dependency to your
shard.yml
:dependencies: shrine: github: jetrockets/shrine.cr
-
Run
shards install
require "shrine"
Shrine.cr is under heavy development!
First of all you should configure Shrine
.
Shrine.configure do |config|
config.storages["cache"] = Storage::FileSystem.new("uploads", prefix: "cache")
config.storages["store"] = Storage::FileSystem.new("uploads")
end
Now you can use Shrine
directly to upload your files.
Shrine.upload(file, "store")
Shrine.upload
method supports additional argument just like Shrine.rb. For example we want our file to have a custom filename.
Shrine.upload(file, "store", metadata: { "filename" => "foo.bar" })
To implement custom uploader class just inherit it from Shrine
. You can override Shrine
methods to implement custom logic. Here is an example how to create a custom file location.
class FileImport::AssetUploader < Shrine
def generate_location(io : IO | UploadedFile, metadata, context, **options)
name = super(io, metadata, **options)
File.join("imports", context[:model].id.to_s, name)
end
end
FileImport::AssetUploader.upload(file, "store", context: { model: YOUR_ORM_MODEL } })
client = Awscr::S3::Client.new("region", "key", "secret")
For S3 compatible services, like DigitalOcean Spaces or Minio, you'll need to set a custom endpoint:
client = Awscr::S3::Client.new("nyc3", "key", "secret", endpoint: "https://nyc3.digitaloceanspaces.com")
The storage is initialized by providing your bucket and client:
storage = Shrine::Storage::S3.new(bucket: "bucket_name", client: client, prefix: "prefix")
Sometimes you'll want to add additional upload options to all S3 uploads. You can do that by passing the :upload_options option:
storage = Shrine::Storage::S3.new(bucket: "bucket_name", client: client, upload_options: { "x-amz-acl"=> "public-read" })
You can tell S3 storage to make uploads public:
storage = Shrine::Storage::S3.new(bucket: "bucket_name", client: client, public: true)
Currently ORM adapters are not implmented.
🎬 Watch the LuckyCast showing how to use Shrine for user profile images
class FileImport < Granite::Base
connection pg
table file_imports
column id : Int64, primary: true
column asset_data : Shrine::UploadedFile, converter: Granite::Converters::Json(Shrine::UploadedFile, JSON::Any)
after_save do
if @asset_changed && @asset_data
@asset_data = FileImport::AssetUploader.store(@asset_data.not_nil!, move: true, context: { model: self })
@asset_changed = false
save!
end
end
def asset=(upload : Amber::Router::File)
@asset_data = FileImport::AssetUploader.cache(upload.file, metadata: { filename: upload.filename })
@asset_changed = true
end
end
class FileImport < Jennifer::Model::Base
@asset_changed : Bool | Nil
with_timestamps
mapping(
id: Primary32,
asset_data: JSON::Any?,
created_at: Time?,
updated_at: Time?
)
after_save :move_to_store
def asset=(upload : Amber::Router::File)
self.asset_data = JSON.parse(FileImport::AssetUploader.cache(upload.file, metadata: { filename: upload.filename }).to_json)
asset_changed! if asset_data
end
def asset
Shrine::UploadedFile.from_json(asset_data.not_nil!.to_json) if asset_data
end
def asset_changed?
@asset_changed || false
end
private def asset_changed!
@asset_changed = true
end
private def move_to_store
if asset_changed?
self.asset_data = JSON.parse(FileImport::AssetUploader.store(asset.not_nil!, move: true, context: { model: self }).to_json)
@asset_changed = false
save!
end
end
end
Shrine.cr has a plugins interface similar to Shrine.rb. You can extend functionality of uploaders inherited from Shrine
and also extend UploadedFile
class.
The DetermineMimeType
plugin is used to get mime type of uploaded file in several ways.
require "shrine/plugins/determine_mime_type"
class Uploader < Shrine
load_plugin(
Shrine::Plugins::DetermineMimeType,
analyzer: Shrine::Plugins::DetermineMimeType::Tools::File
)
finalize_plugins!
end
Analyzers
The following analyzers are accepted:
Name | Description |
---|---|
File |
(Default). Uses the file utility to determine the MIME type from file contents. It is installed by default on most operating systems. |
Mime |
Uses the MIME.from_filename method to determine the MIME type from file. |
ContentType |
Retrieves the value of the #content_type attribute of the IO object. Note that this value normally comes from the "Content-Type" request header, so it's not guaranteed to hold the actual MIME type of the file. |
The AddMetadata
plugin provides a convenient method for extracting and adding custom metadata values.
require "base64"
require "shrine/plugins/add_metadata"
class Uploader < Shrine
load_plugin(Shrine::Plugins::AddMetadata)
add_metadata :signature, -> {
Base64.encode(io.gets_to_end)
}
finalize_plugins!
end
The above will add "signature"
to the metadata hash.
image.metadata["signature"]
Multiple values
You can also extract multiple metadata values at once.
class Uploader < Shrine
load_plugin(Shrine::Plugins::AddMetadata)
add_metadata :multiple_values, -> {
text = io.gets_to_end
Shrine::UploadedFile::MetadataType{
"custom_1" => text,
"custom_2" => text * 2
}
}
finalize_plugins!
end
image.metadata["custom_1"]
image.metadata["custom_2"]
The StoreDimensions
plugin extracts dimensions of uploaded images and stores them into the metadata. Additional dependency https://github.com/jetrockets/fastimage.cr needed for this plugin.
require "fastimage"
require "shrine/plugins/store_dimensions"
class Uploader < Shrine
load_plugin(Shrine::Plugins::StoreDimensions,
analyzer: Shrine::Plugins::StoreDimensions::Tools::FastImage)
finalize_plugins!
end
image.metadata["width"]
image.metadata["height"]
Analyzers
The following analyzers are accepted:
Name | Description |
---|---|
FastImage |
(Default) Uses the FastImage. |
Identify |
A built-in solution that wrapps ImageMagick's identify command. |
In no particular order, features that have been implemented and are planned. Items not marked as completed may have partial implementations.
- Shrine
- Shrine::UploadedFile
- ==
- #original_filename
- #extension
- #size
- #mime_type
- #close
- #url
- #exists?
- #open
- #download
- #stream
- #replace
- #delete
- Shrine::Attacher
- Shrine::Attachment
- Shrine::Storage
- Shrine::Storage::Memory
- Shrine::Storage::FileSystem
- Shrine::Storage::S3
- Uploaders
- Custom uploaders
- Derivatives
- ORM adapters
- Plugins
- Background processing
- Fork it (https://github.com/your-github-user/shrine.cr/fork)
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create a new Pull Request
- Igor Alexandrov - creator and maintainer
- Arina Shmeleva - helped with S3 Storage
- Mick Wout - Plugins and Lucky integration