Added Swagger generation

README.rst

@@ -1154,6 +1154,111 @@ If, for some complex cases, you need to generate/re-generate just part of the ca
 use ``rake apipie:cache cache_part=index`` resp. ``rake apipie:cache cache_part=resources``
 To generate it for different locations for further processing use ``rake apipie:cache OUT=/tmp/apipie_cache``.
 
+====================================
+ Static Swagger (OpenAPI 2.0) files
+====================================
+
+To generate a static Swagger definition file from the api, run ``rake apipie:static_swagger_json``.
+By default the documentation for the default API version is
+used. You can specify the version with ``rake apipie:static_swagger_json[2.0]``. A swagger file will be
+generated for each locale.  The files will be generated in the same location as the static_json files, but
+instead of being named ``schema_apipie[.locale].json``, they will be called ``schema_swagger[.locale].json``.
+
+Specifying default values for parameters
+-----------------------------------------
+Swagger allows method definitions to include an indication of the the default value for each parameter. To include such
+indications, use ``:default_value => <some value>`` in the parameter definition DSL.  For example:
+
+.. code:: ruby
+
+     param :do_something, Boolean, :desc => "take an action", :required => false, :default_value => false
+
+
+Generated Warnings
+-------------------
+The help identify potential improvements to your documentation, the swagger generation process issues warnings if
+it identifies various shortcomings of the DSL documentation. Each warning has a code to allow selective suppression
+(see swagger-specific configuration below)
+
+:100: missing short description for method
+:101: added missing / at beginning of path
+:102: no return codes specified for method
+:103: a parameter is a generic Hash without an internal type specification
+:104: a parameter is an 'in-path' parameter, but specified as 'not required' in the DSL
+:105: a parameter is optional but does not have a default value specified
+:106: a parameter was ommitted from the swagger output because it is a Hash without fields in a formData specification
+:107: a path parameter is not described
+:108: inferring that a parameter type is boolean because described as an enum with [false,true] values
+
+
+
+Swagger-Specific Configuration Parameters
+-------------------------------------------------
+
+There are several configuration parameters that determine the structure of the generated swagger file:
+
+``config.swagger_content_type_input``
+    If the value is ``:form_data`` - the swagger file will indicate that the server consumes the content types
+    ``application/x-www-form-urlencoded`` and ``multipart/form-data``.  Non-path parameters will have the
+    value ``"in": "formData"``.  Note that parameters of type Hash that do not have any fields in them will *be ommitted*
+    from the resulting files, as there is no way to describe them in swagger.
+
+    If the value is ``:json`` - the swagger file will indicate that the server consumes the content type
+    ``application/json``. All non-path parameters will be included in the schema of a single ``"in": "body"`` parameter
+    of type ``object``.
+
+    You can specify the value of this configuration parameter as an additional input to the rake command (e.g.,
+    ``rake apipie:static_swagger_json[2.0,form_data]``).
+
+``config.swagger_json_input_uses_refs``
+    This parameter is only relevant if ``swagger_content_type_input`` is ``:json``.
+
+    If ``true``: the schema of the ``"in": "body"`` parameter of each method is given its own entry in the ``definitions``
+    section, and is referenced using ``$ref`` from the method definition.
+
+    If ``false``: the body parameter definitions are inlined within the method definitions.
+
+``config.swagger_include_warning_tags``
+    If ``true``: in addition to tagging methods with the name of the resource they belong to, methods for which warnings
+    have been issued will be tagged with.
+
+``config.swagger_suppress_warnings``
+    If ``false``: no warnings will be suppressed
+
+    If ``true``: all warnings will be suppressed
+
+    If an array of values (e.g., ``[100,102,107]``), only the warnings identified by the numbers in the array will be suppressed.
+
+``config.swagger_api_host``
+    The value to place in the swagger host field.
+
+    Default is ``localhost:3000``
+
+    If ``nil`` then then host field will not be included.
+
+
+
+Known limitations of the current implementation
+-------------------------------------------------
+* There is currently no way to document the structure and content-type of the data returned from a method
+* Recorded examples are currently not included in the generated swagger file
+* The apipie ``formats`` value is ignored.
+* It is not possible to specify the "consumed" content type on a per-method basis
+* It is not possible to leverage all of the parameter type/format capabilities of swagger
+* Only OpenAPI 2.0 is supported
+
+====================================
+ Dynamic Swagger generation
+====================================
+
+To generate swagger dynamically, use ``http://localhost:3000/apipie.json?type=swagger``.
+
+Note that authorization is not supported for dynamic swagger generation, so if ``config.authorize`` is defined,
+dynamic swagger generation will be disabled.
+
+Dynamically generated swagger is not cached, and is always generated on the fly.
+
+
 ===================
  JSON checksums
 ===================

apipie-rails.gemspec

@@ -24,4 +24,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency "RedCloth"
   s.add_development_dependency "rake"
   s.add_development_dependency "rdoc"
+  s.add_development_dependency "json-schema", "~> 2.8"
 end

app/controllers/apipie/apipies_controller.rb

@@ -14,11 +14,17 @@ def authenticate
       end
     end
 
+
     def index
       params[:version] ||= Apipie.configuration.default_version
 
       get_format
 
+      if params[:type].to_s == 'swagger' && params[:format].to_s == 'json'
+        head :forbidden and return if Apipie.configuration.authorize
+        should_render_swagger = true
+      end
+
       respond_to do |format|
 
         if Apipie.configuration.use_cache?
@@ -31,9 +37,19 @@ def index
         Apipie.load_documentation if Apipie.configuration.reload_controllers? || (Rails.version.to_i >= 4.0 && !Rails.application.config.eager_load)
 
         I18n.locale = @language
-        @doc = Apipie.to_json(params[:version], params[:resource], params[:method], @language)
 
-        @doc = authorized_doc
+        if should_render_swagger
+          prev_warning_value = Apipie.configuration.swagger_suppress_warnings
+          begin
+            Apipie.configuration.swagger_suppress_warnings = true
+            @doc = Apipie.to_swagger_json(params[:version], params[:resource], params[:method], @language)
+          ensure
+            Apipie.configuration.swagger_suppress_warnings = prev_warning_value
+          end
+        else
+          @doc = Apipie.to_json(params[:version], params[:resource], params[:method], @language)
+          @doc = authorized_doc
+        end
 
         format.json do
           if @doc

lib/apipie-rails.rb

@@ -17,6 +17,7 @@
 require "apipie/railtie"
 require 'apipie/extractor'
 require "apipie/version"
+require "apipie/swagger_generator"
 
 if Rails.version.start_with?("3.0")
   warn 'Warning: apipie-rails is not going to support Rails 3.0 anymore in future versions'

lib/apipie/apipie_module.rb

@@ -13,6 +13,11 @@ def self.to_json(version = nil, resource_name = nil, method_name = nil, lang = n
     app.to_json(version, resource_name, method_name, lang)
   end
 
+  def self.to_swagger_json(version = nil, resource_name = nil, method_name = nil, lang = nil, clear_warnings=true)
+    version ||= Apipie.configuration.default_version
+    app.to_swagger_json(version, resource_name, method_name, lang, clear_warnings)
+  end
+
   # all calls delegated to Apipie::Application instance
   def self.method_missing(method, *args, &block)
     app.respond_to?(method) ? app.send(method, *args, &block) : super

lib/apipie/application.rb

@@ -240,6 +240,7 @@ def init_env
       @resource_descriptions ||= HashWithIndifferentAccess.new { |h, version| h[version] = {} }
       @controller_to_resource_id ||= {}
       @param_groups ||= {}
+      @swagger_generator = Apipie::SwaggerGenerator.new(self)
 
       # what versions does the controller belong in (specified by resource_description)?
       @controller_versions ||= Hash.new { |h, controller| h[controller.to_s] = [] }
@@ -254,6 +255,24 @@ def reload_examples
       @recorded_examples = nil
     end
 
+    def to_swagger_json(version, resource_name, method_name, lang, clear_warnings=false)
+      return unless valid_search_args?(version, resource_name, method_name)
+
+      # if resource_name is blank, take just resources which have some methods because
+      # we dont want to show eg ApplicationController as resource
+      # otherwise, take only the specified resource
+      _resources = resource_descriptions[version].inject({}) do |result, (k,v)|
+         if resource_name.blank?
+           result[k] = v unless v._methods.blank?
+         else
+           result[k] = v if k == resource_name
+         end
+         result
+       end
+
+      @swagger_generator.generate_from_resources(version,_resources, method_name, lang, clear_warnings)
+    end
+
     def to_json(version, resource_name, method_name, lang)
 
       return unless valid_search_args?(version, resource_name, method_name)

lib/apipie/configuration.rb

@@ -7,11 +7,16 @@ class Configuration
       :validate, :validate_value, :validate_presence, :validate_key, :authenticate, :doc_path,
       :show_all_examples, :process_params, :update_checksum, :checksum_path,
       :link_extension, :record, :languages, :translate, :locale, :default_locale,
-      :persist_show_in_doc, :authorize
+      :persist_show_in_doc, :authorize,
+      :swagger_include_warning_tags, :swagger_content_type_input, :swagger_json_input_uses_refs,
+      :swagger_suppress_warnings, :swagger_api_host, :swagger_generate_x_computed_id_field
 
     alias_method :validate?, :validate
     alias_method :required_by_default?, :required_by_default
     alias_method :namespaced_resources?, :namespaced_resources
+    alias_method :swagger_include_warning_tags?, :swagger_include_warning_tags
+    alias_method :swagger_json_input_uses_refs?, :swagger_json_input_uses_refs
+    alias_method :swagger_generate_x_computed_id_field?, :swagger_generate_x_computed_id_field
 
     # matcher to be used in Dir.glob to find controllers to be reloaded e.g.
     #
@@ -165,6 +170,12 @@ def initialize
       @translate = lambda { |str, locale| str }
       @persist_show_in_doc = false
       @routes_formatter = RoutesFormatter.new
+      @swagger_content_type_input = :form_data  # this can be :json or :form_data
+      @swagger_json_input_uses_refs = false
+      @swagger_include_warning_tags = false
+      @swagger_suppress_warnings = false #[105,100,102]
+      @swagger_api_host = "localhost:3000"
+      @swagger_generate_x_computed_id_field = false
     end
   end
 end