class Goliath::Rack::Validation::RequiredValue


use Goliath::Rack::Validation::RequiredValue, {:key => ‘baz’, :values => ‘awesome’}
use Goliath::Rack::Validation::RequiredValue, {:key => ‘mode’, :values => %w(foo bar)}
@example
Middleware to validate that a given parameter has a specified value.

def call(env) 

def call(env)
  return validation_error(400, "Provided #{@key} is invalid") unless value_valid?(env['params'])
  @app.call(env)
end

def initialize(app, opts = {})

Returns:
  • (Goliath::Rack::Validation::RequiredValue) - The validator

Options Hash: (**opts)
  • :values (String | Array) -- The values to verify are in the params
  • :key (String) -- The key to look for in params (default: id)

Parameters:
  • opts (Hash) -- The options to create the validator with
  • app () -- The app object 
def initialize(app, opts = {})
  @app = app
  @key = opts[:key] || 'id'
  @values = [opts[:values]].flatten
end

def value_valid?(params) 

def value_valid?(params)
  if !params.has_key?(key) || params[key].nil? ||
      (params[key].is_a?(String) && params[key] =~ /^\s*$/)
    return false
  end
  if params[key].is_a?(Array)
    return false if params[key].empty?
    params[key].each { |k| return false unless values.include?(k) }
  elsif !values.include?(params[key])
    return false
  end
  true
end