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module Api
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#TODO: inherit from application controller after cleanup
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class BaseController < ActionController::Base
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before_filter :set_default_response_format, :authorize, :set_resource_params
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respond_to :json
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def process_error(options = { })
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options[:json_code] ||= :unprocessable_entity
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errors = if options[:error]
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options[:error]
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else
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options[:object] ||= get_resource || raise("No error to process")
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if options[:object].respond_to?(:errors)
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#TODO JSON resposne should include the real errors, not the pretty full messages
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logger.info "Failed to save: #{options[:object].errors.full_messages.join(", ")}"
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options[:object].errors.full_messages
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else
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raise("No error to process")
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end
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end
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# set 403 status on permission errors
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if errors.any? { |error| error =~ /You do not have permission/ }
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options[:json_code] = :forbidden
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end
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render :json => { "errors" => errors }, :status => options[:json_code]
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end
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def process_response(condition, response = nil)
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if condition
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response ||= get_resource
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respond_with response
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else
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process_error
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end
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end
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# Authorize the user for the requested action
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def authorize(ctrl = params[:controller], action = params[:action])
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if SETTINGS[:login]
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unless User.current
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user_to_login = nil
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if result = authenticate_with_http_basic { |u, p| user_to_login = u; User.try_to_login(u, p) }
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User.current = result
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else
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process_error :error => "Unable to authenticate user %s" % user_to_login, :json_code => :unauthorized
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return false
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end
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end
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else
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# We assume we always have a user logged in, if authentication is disabled, the user is the build-in admin account.
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User.current = User.find_by_login("admin")
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end
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User.current.allowed_to?(:controller => ctrl.gsub(/::/, "_").underscore, :action => action) or deny_access
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end
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def deny_access
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process_error :error => "Access denied", :json_code => :forbidden
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false
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end
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def get_resource
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instance_variable_get :"@#{resource_name}" or raise 'no resource loaded'
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end
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def resource_name
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controller_name.singularize
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end
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def resource_class
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@resource_class ||= resource_name.camelize.constantize
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end
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protected
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# searches for a resource based on its name and assign it to an instance variable
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# required for models which implement the to_param method
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#
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# example:
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# @host = Host.find_resource params[:id]
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def find_resource
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finder, key = case
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when (id = params[:"#{resource_name}_id"]).present?
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[:find_by_id, id]
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when (name = params[:"#{resource_name}_name"]).present?
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[:find_by_name, name]
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else
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[nil, nil]
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end
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resource = resource_class.send(finder, key) if finder
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if finder && resource
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return instance_variable_set(:"@#{resource_name}", resource)
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else
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not_found and return false
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end
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end
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def not_found(exception = nil)
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logger.debug "not found: #{exception}" if exception
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head :status => 404
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end
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def set_default_response_format
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request.format = :json if params[:format].nil?
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end
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# store params[:id] under correct predicable key
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def set_resource_params
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if (id_or_name = params.delete(:id))
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suffix = id_or_name =~ /^\d+$/ ? 'id' : 'name'
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params[:"#{resource_name}_#{suffix}"] = id_or_name
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end
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end
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end
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end
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