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rest-sinatra.rb
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rest-sinatra.rb
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module RestSinatra
def self.included(includer)
includer.extend(ClassMethods)
end
module ClassMethods
attr_reader :config
def resource(name, &block)
_resource(name, :regular, &block)
end
def nestable_resource(name, &block)
_resource(name, :nestable, &block)
end
protected
def _resource(name, resource_type, &block)
config = evaluate_block(name, resource_type, &block)
validate(config)
build_resource(config)
config
end
def evaluate_block(name, resource_type, &block)
scope = Object.new
scope.extend(ResourceMethods)
scope.instance_eval do
@c = {
:name => name,
:resource_type => resource_type,
:model => nil,
:read_only => [],
:permission => nil,
:callbacks => {},
:nested_resources => []
}
end
scope.instance_eval(&block)
scope.instance_variable_get("@c")
end
def validate(c)
raise "name required" unless c[:name]
raise "model required" unless c[:model]
c[:nested_resources].each do |resource|
unless resource[:association]
raise "association required for #{resource[:class]}"
end
end
end
def build_resource(config)
case config[:resource_type]
when :regular
build_parent_resource(config)
build_nested_resources(config)
when :nestable
save_nestable_config(config)
else
raise "Unexpected resource_type"
end
end
def build_parent_resource(config)
callbacks = config[:callbacks]
model = config[:model]
name = config[:name]
read_only = config[:read_only]
get '/?' do
require_at_least(:basic)
@documents = find_with_filters(params, model)
@documents.to_json
end
get '/:id/?' do |id|
require_at_least(:basic)
id = params.delete("id")
@document = find_document!(model, id)
@document.to_json
end
post '/?' do
require_at_least(:curator)
id = params.delete("id")
validate_before_create(params, model, read_only)
@document = model.find_by_id(id)
callback(callbacks[:before_save])
callback(callbacks[:before_create])
@document = model.new(params)
unless @document.valid?
error 400, { "errors" => @document.errors.errors }.to_json
end
@document.save
callback(callbacks[:after_create])
callback(callbacks[:after_save])
response.status = 201
response.headers['Location'] = full_uri "/#{name}/#{@document.id}"
@document.to_json
end
put '/:id/?' do
require_at_least(:curator)
id = params.delete("id")
@document = find_document!(model, id)
validate_before_update(params, model, read_only)
callback(callbacks[:before_save])
callback(callbacks[:before_update])
validate_before_update(params, model, read_only)
@document = model.update(id, params)
unless @document.valid?
error 400, { "errors" => @document.errors.errors }.to_json
end
callback(callbacks[:after_update])
callback(callbacks[:after_save])
@document.to_json
end
delete '/:id/?' do
require_at_least(:curator)
id = params.delete("id")
@document = find_document!(model, id)
callback(callbacks[:before_destroy])
@document.destroy
callback(callbacks[:after_destroy])
{ "id" => id }.to_json
end
helpers do
def find_document!(model, id)
document = model.find_by_id(id)
error 404, [].to_json unless document
document
end
end
end
def build_nested_resources(parent_config)
parent_config[:nested_resources].each do |resource|
nested_res_class = resource[:class]
assoc = resource[:association]
nested_config = restore_nestable_config(nested_res_class)
build_nested_resource(nested_res_class, assoc, parent_config, nested_config)
end
end
# klass : nested resource class
# association : a method on the parent model that will return child models
def build_nested_resource(klass, association, parent_config, child_config)
callbacks = child_config[:callbacks]
child_model = child_config[:model]
child_name = child_config[:name]
permission = child_config[:permission]
read_only = child_config[:read_only]
parent_model = parent_config[:model]
parent_name = parent_config[:name]
get "/:parent_id/#{child_name}/?" do
parent_id = params.delete("parent_id")
permission_check(:basic, permission, parent_id)
@parent_document = find_parent!(parent_model, parent_id)
all_child_documents = @parent_document.send(association)
@child_documents = nested_find_with_filters(all_child_documents, params, parent_model)
@child_documents.to_json
end
get "/:parent_id/#{child_name}/:child_id/?" do
parent_id = params.delete("parent_id")
permission_check(:basic, permission, parent_id)
child_id = params.delete("child_id")
@parent_document, @child_document = find_documents!(parent_model, parent_id, association, child_id)
@child_document.to_json
end
post "/:parent_id/#{child_name}/?" do
parent_id = params.delete("parent_id")
permission_check(:curator, permission, parent_id)
@parent_document = find_parent!(parent_model, parent_id)
validate_before_create(params, child_model, read_only)
callback(callbacks[:before_save])
callback(callbacks[:before_create])
@child_document = child_model.new(params)
@parent_document.send(association) << @child_document
error 500, [].to_json unless @parent_document.save
callback(callbacks[:after_create])
callback(callbacks[:after_save])
response.status = 201
response.headers['Location'] = full_uri(
"/#{parent_name}/#{parent_id}/#{child_name}/#{@child_document.id}"
)
@child_document.to_json
end
put "/:parent_id/#{child_name}/:child_id/?" do
parent_id = params.delete("parent_id")
permission_check(:curator, permission, parent_id)
child_id = params.delete("child_id")
@parent_document, @child_document = find_documents!(parent_model, parent_id, association, child_id)
validate_before_update(params, child_model, read_only)
callback(callbacks[:before_save])
callback(callbacks[:before_update])
@child_document.attributes = params
child_index = @parent_document.send(association).index(@child_document)
@parent_document.send(association)[child_index] = @child_document
error 500, [].to_json unless @parent_document.save
callback(callbacks[:after_update])
callback(callbacks[:after_save])
@child_document.to_json
end
delete "/:parent_id/#{child_name}/:child_id/?" do
parent_id = params.delete("parent_id")
permission_check(:curator, permission, parent_id)
child_id = params.delete("child_id")
@parent_document, @child_document = find_documents!(parent_model, parent_id, association, child_id)
callback(callbacks[:before_destroy])
@parent_document.send(association).delete(@child_document)
callback(callbacks[:after_destroy])
error 500, [].to_json unless @parent_document.save
{ "id" => child_id }.to_json
end
helpers do
def find_parent!(parent_model, parent_id)
parent_document = parent_model.find_by_id(parent_id)
error 404, [].to_json unless parent_document
parent_document
end
def find_child!(parent_document, association, child_id)
child_document = parent_document.send(association).find { |x| x.id == child_id }
error 404, [].to_json unless child_document
child_document
end
def find_documents!(parent_model, parent_id, association, child_id)
parent_document = find_parent!(parent_model, parent_id)
child_document = find_child!(parent_document, association, child_id)
[parent_document, child_document]
end
end
end
def save_nestable_config(config)
@nestable_resource_config = config
end
def restore_nestable_config(klass)
klass.instance_variable_get("@nestable_resource_config")
end
end
module ResourceMethods
def model(model)
raise "model already declared" if @c[:model]
@c[:model] = model
end
def read_only(attribute)
@c[:read_only] << attribute
end
def permission(level)
raise "permission already declared" if @c[:permission]
@c[:permission] = level
end
def callback(name, &block)
@c[:callbacks][name] = block
end
def nested_resource(klass, options)
@c[:nested_resources] << options.merge({:class => klass})
end
end
end