Aug 30, 2018 Also Read: Caching In Ruby On Rails 5.2. Step: 3 – Create JWT service file. Create JsonWebToken class under lib/jsonwebtoken.rb file. This will be used to create and validate the jwt token. JsonWebToken’s encode method is used to create JWT token by using payload and secret key. R/rails: A subreddit for discussion and news about Ruby on Rails development. Also that example uses the rails secret, you should always generate one just for jwt. Because the API key is still revealed to a user of the site. So I figure that the best way to do this is with AJAX?
1 What is Active Storage?
Active Storage facilitates uploading files to a cloud storage service likeAmazon S3, Google Cloud Storage, or Microsoft Azure Storage and attaching thosefiles to Active Record objects. It comes with a local disk-based service fordevelopment and testing and supports mirroring files to subordinate services forbackups and migrations.
Using Active Storage, an application can transform image uploads withImageMagick, generate image representations ofnon-image uploads like PDFs and videos, and extract metadata from arbitraryfiles.
2 Setup
Active Storage uses two tables in your application’s database named
active_storage_blobs and active_storage_attachments . After upgrading yourapplication to Rails 5.2, run rails active_storage:install to generate amigration that creates these tables. Use rails db:migrate to run themigration.
Declare Active Storage services in
config/storage.yml . For each service yourapplication uses, provide a name and the requisite configuration. The examplebelow declares three services named local , test , and amazon :
Tell Active Storage which service to use by setting
Rails.application.config.active_storage.service . Because each environment willlikely use a different service, it is recommended to do this on aper-environment basis. To use the disk service from the previous example in thedevelopment environment, you would add the following toconfig/environments/development.rb :
To use the Amazon S3 service in production, you add the following to
config/environments/production.rb :
Continue reading for more information on the built-in service adapters (e.g.
Disk and S3 ) and the configuration they require.
2.1 Disk Service
Declare a Disk service in
config/storage.yml :
2.2 Amazon S3 Service
Declare an S3 service in
config/storage.yml :
Add the
aws-sdk-s3 gem to your Gemfile :
The core features of Active Storage require the following permissions:
s3:ListBucket , s3:PutObject , s3:GetObject , and s3:DeleteObject . If you have additional upload options configured such as setting ACLs then additional permissions may be required.
If you want to use environment variables, standard SDK configuration files, profiles,IAM instance profiles or task roles, you can omit the
access_key_id , secret_access_key ,and region keys in the example above. The Amazon S3 Service supports all of theauthentication options described in the AWS SDK documentation.
2.3 Microsoft Azure Storage Service
Declare an Azure Storage service in
config/storage.yml :
Add the
azure-storage gem to your Gemfile :
2.4 Google Cloud Storage Service
Declare a Google Cloud Storage service in
config/storage.yml :
Optionally provide a Hash of credentials instead of a keyfile path:
Add the
google-cloud-storage gem to your Gemfile :
2.5 Mirror Service
You can keep multiple services in sync by defining a mirror service. When a fileis uploaded or deleted, it's done across all the mirrored services. Mirroredservices can be used to facilitate a migration between services in production.You can start mirroring to the new service, copy existing files from the oldservice to the new, then go all-in on the new service. Define each of theservices you'd like to use as described above and reference them from a mirroredservice.
3 Attaching Files to Records3.1
|
Event name | Event target | Event data (event.detail ) |
Description |
---|---|---|---|
direct-uploads:start |
<form> |
None | A form containing files for direct upload fields was submitted. |
direct-upload:initialize |
<input> |
{id, file} |
Dispatched for every file after form submission. |
direct-upload:start |
<input> |
{id, file} |
A direct upload is starting. |
direct-upload:before-blob-request |
<input> |
{id, file, xhr} |
Before making a request to your application for direct upload metadata. |
direct-upload:before-storage-request |
<input> |
{id, file, xhr} |
Before making a request to store a file. |
direct-upload:progress |
<input> |
{id, file, progress} |
As requests to store files progress. |
direct-upload:error |
<input> |
{id, file, error} |
An error occurred. An alert will display unless this event is canceled. |
direct-upload:end |
<input> |
{id, file} |
A direct upload has ended. |
direct-uploads:end |
<form> |
None | All direct uploads have ended. |
8.3 Example
You can use these events to show the progress of an upload.
To show the uploaded files in a form:
Add styles:
9 Discarding Files Stored During System Tests
System tests clean up test data by rolling back a transaction. Because destroyis never called on an object, the attached files are never cleaned up. If youwant to clear the files, you can do it in an
after_teardown
callback. Doing ithere ensures that all connections created during the test are complete andyou won't receive an error from Active Storage saying it can't find a file.
If your system tests verify the deletion of a model with attachments and you'reusing Active Job, set your test environment to use the inline queue adapter sothe purge job is executed immediately rather at an unknown time in the future.
You may also want to use a separate service definition for the test environmentso your tests don't delete the files you create during development.
10 Implementing Support for Other Cloud Services
If you need to support a cloud service other than these, you will need toimplement the Service. Each service extends
ActiveStorage::Service
by implementing the methods necessary to upload and download files to the cloud.
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