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# Protects OmniAuth request phase against CSRF.
module OmniAuth
# Based on ActionController::RequestForgeryProtection.
class RequestForgeryProtection
def initialize(env)
@env = env
end
def request
@request ||= ActionDispatch::Request.new(@env)
end
def session
request.session
end
def reset_session
request.reset_session
end
def params
request.params
end
def call
verify_authenticity_token
end
def verify_authenticity_token
if !verified_request?
Rails.logger.warn "Can't verify CSRF token authenticity" if Rails.logger
handle_unverified_request
end
end
private
def protect_against_forgery?
ApplicationController.allow_forgery_protection
end
def request_forgery_protection_token
ApplicationController.request_forgery_protection_token
end
def forgery_protection_strategy
ApplicationController.forgery_protection_strategy
end
def verified_request?
!protect_against_forgery? || request.get? || request.head? ||
form_authenticity_token == params[request_forgery_protection_token] ||
form_authenticity_token == request.headers['X-CSRF-Token']
end
def handle_unverified_request
forgery_protection_strategy.new(self).handle_unverified_request
end
# Sets the token value for the current session.
def form_authenticity_token
session[:_csrf_token] ||= SecureRandom.base64(32)
end
end
end