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module ::Proxy::PluginValidators
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class Base
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def initialize(plugin, setting_name, params, predicate)
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@plugin = plugin
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@setting_name = setting_name.to_sym
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@params = params
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@predicate = predicate
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end
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def required_setting?
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@plugin.plugin_default_settings.has_key?(@setting_name)
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end
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def evaluate_predicate(settings)
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return true if @predicate.nil?
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@predicate.call(settings)
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end
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def evaluate_predicate_and_validate!(settings)
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return true unless evaluate_predicate(settings)
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validate!(settings)
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end
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end
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class FileReadable < Base
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def validate!(settings)
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setting_value = settings[@setting_name]
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return true if !required_setting? && setting_value.nil? # validate optional settings only if they aren't nil
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raise ::Proxy::Error::ConfigurationError, "File at '#{setting_value}' defined in '#{@setting_name}' parameter doesn't exist or is unreadable" unless File.readable?(setting_value)
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true
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end
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end
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class Presence < Base
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def validate!(settings)
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setting_value = settings[@setting_name]
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empty_value = setting_value.nil?
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empty_value ||= setting_value.empty? if setting_value.is_a?(String)
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raise ::Proxy::Error::ConfigurationError, "Parameter '#{@setting_name}' is expected to have a non-empty value" if empty_value
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true
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end
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end
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class Url < Base
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def validate!(settings)
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setting_value = settings[@setting_name]
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raise ::Proxy::Error::ConfigurationError, "Setting '#{@setting_name}' is expected to contain a url" if setting_value.to_s.empty?
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parsed = URI.parse(setting_value)
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raise ::Proxy::Error::ConfigurationError, "Setting '#{@setting_name}' is missing a scheme" if parsed.scheme.nil? || parsed.scheme.empty?
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true
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rescue URI::InvalidURIError
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raise ::Proxy::Error::ConfigurationError.new("Setting '#{@setting_name}' contains an invalid url")
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end
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end
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end
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