Class: Rack::Csrf
- Inherits:
-
Object
show all
- Defined in:
- lib/rack/csrf.rb,
lib/rack/csrf/version.rb
Defined Under Namespace
Classes: InvalidCsrfToken, SessionUnavailable
Constant Summary
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- VERSION =
'2.6.0'
- @@field =
'_csrf'
'X_CSRF_TOKEN'
- @@key =
'csrf.token'
Class Method Summary
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Instance Method Summary
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Constructor Details
#initialize(app, opts = {}) ⇒ Csrf
Returns a new instance of Csrf.
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# File 'lib/rack/csrf.rb', line 13
def initialize(app, opts = {})
@app = app
@raise_if_invalid = opts.fetch(:raise, false)
@skip_list = opts.fetch(:skip, []).map {|r| /\A#{r}\Z/i}
@skip_if = opts[:skip_if]
@check_only_list = opts.fetch(:check_only, []).map {|r| /\A#{r}\Z/i}
@@field = opts[:field] if opts[:field]
@@header = opts[:header] if opts[:header]
@@key = opts[:key] if opts[:key]
standard_http_methods = %w(POST PUT DELETE PATCH)
check_also = opts.fetch(:check_also, [])
@http_methods = (standard_http_methods + check_also).flatten.uniq
end
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Class Method Details
.field ⇒ Object
Also known as:
csrf_field
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# File 'lib/rack/csrf.rb', line 49
def self.field
@@field
end
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# File 'lib/rack/csrf.rb', line 53
def self.
@@header
end
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.key ⇒ Object
Also known as:
csrf_key
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# File 'lib/rack/csrf.rb', line 45
def self.key
@@key
end
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# File 'lib/rack/csrf.rb', line 65
def self.metatag(env, options = {})
name = options.fetch(:name, '_csrf')
%Q(<meta name="#{name}" content="#{token(env)}" />)
end
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.tag(env) ⇒ Object
Also known as:
csrf_tag
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# File 'lib/rack/csrf.rb', line 61
def self.tag(env)
%Q(<input type="hidden" name="#{field}" value="#{token(env)}" />)
end
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.token(env) ⇒ Object
Also known as:
csrf_token
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# File 'lib/rack/csrf.rb', line 57
def self.token(env)
env['rack.session'][key] ||= SecureRandom.urlsafe_base64(32)
end
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Instance Method Details
#call(env) ⇒ Object
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# File 'lib/rack/csrf.rb', line 29
def call(env)
unless env['rack.session']
fail SessionUnavailable, 'Rack::Csrf depends on session middleware'
end
req = Rack::Request.new(env)
let_it_pass = skip_checking(req) ||
!@http_methods.include?(req.request_method) ||
found_a_valid_token?(req)
if let_it_pass
@app.call(env)
else
fail InvalidCsrfToken if @raise_if_invalid
[403, {'Content-Type' => 'text/html', 'Content-Length' => '0'}, []]
end
end
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