kemal-csrf

0.7.09 versions

github.com/kemalcr/kemal-csrf

Add CSRF protection to your Kemal application

28 stars

0 dependents

License: MIT

Nothing has been indexed for 0.7.0 yet. The tag is recorded, its shard.yml has not been read, so the manifest and dependency list below are empty because they are unknown rather than because they are absent.

Installation

# Add this to your shard.yml
dependencies:
  kemal-csrf:
    github: kemalcr/kemal-csrf
    version: ~> 0.7.0

Then run:

shards install

shard.yml

No shard.yml has been indexed for 0.7.0. You can read it on the repository.

Dependencies

Unknown: the shard.yml for this version has not been read yet.

README

This README is the one indexed from the repository at its latest ref, not from the tag for this version.

# kemal-csrf

Adds CSRF protection to your [Kemal](http://kemalcr.com) application.

Requires a session middleware to be initialized first.

## Installation


Add this to your application's `shard.yml`:

```yaml
dependencies:
  kemal-csrf:
    github: kemalcr/kemal-csrf
```


## Usage

Basic Use
```crystal
require "kemal-csrf"

add_handler CSRF.new
```

To access the CSRF token of the active session you can do the following in your .ecr form(s)
```html
<input type="hidden" name="authenticity_token" value='<%= env.session.string("csrf") %>'>
```

You can also change the name of the form field, header name, the methods which don't need csrf,error message and routes which you don't want csrf to apply.
All of these are optional
```crystal
require "kemal-csrf"

add_handler CSRF.new(
  header: "X_CSRF_TOKEN",
  allowed_methods: ["GET", "HEAD", "OPTIONS", "TRACE"],
  allowed_routes: ["/api/somecallback", "/api/v1/**"],
  parameter_name: "_csrf", 
  error: "CSRF Error",
  http_only: false,
  samesite: nil,
)
```

If you need to have some logic within your error response, you can also pass it a proc (a pointer to a function)


```crystal
require "kemal-csrf"

add_handler CSRF.new(
  header: "X_CSRF_TOKEN",
  allowed_methods: ["GET", "HEAD", "OPTIONS", "TRACE"],
  allowed_routes: ["/api/somecallback", "/api/v1/**"],
  parameter_name: "_csrf", 
  error: ->myerrorhandler(HTTP::Server::Context)
)

def myerrorhandler(env)
  if env.request.headers["Content-Type"]? == "application/json"
    {"error" => "csrf error"}.to_json
  else
    "<html><head><title>Error</title><body><h1>You cannot post to this route without a valid csrf token</h1></body></html>"
  end
end
```


## Contributing

1. Fork it ( https://github.com/kemalcr/kemal-csrf/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

## Contributors

- [sdogruyol](https://github.com/sdogruyol) Serdar Dogruyol - creator, maintainer

kemal-csrf

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