Rebar3 plugin for Nova

=====

A rebar plugin for nova

Build

$ rebar3 compile

Installation

Add the plugin to your rebar config (~/.config/rebar3/rebar.config):

{plugins, [
    {rebar3_nova, {git, "https://github.com/novaframework/rebar3_nova.git", {branch, "master"}}}
]}.

For latest stable from hex:

{plugins, [rebar3_nova]}.

Then just call your plugin directly in an existing application:

$ rebar3 nova
===> Fetching rebar3_nova
===> Compiling rebar3_nova

Commands

nova serve — Auto-reload development server

Starts the application with auto-reload. Source file changes are automatically compiled and hot-loaded.

$ rebar3 nova serve

nova routes — List compiled routes

Displays the compiled routing tree with methods, paths, and handler modules.

$ rebar3 nova routes

nova gen_controller — Generate a controller

Scaffolds a controller module with stub functions for CRUD actions.

$ rebar3 nova gen_controller --name users
===> Created src/controllers/myapp_users_controller.erl

$ rebar3 nova gen_controller --name users --actions list,show
===> Created src/controllers/myapp_users_controller.erl

Options:

Flag	Required	Default	Description
--name, -n	yes	—	Controller name
--actions, -a	no	list,show,create,update,delete	Comma-separated actions to generate

Generated functions return stub responses:

• list/1, show/1, update/1 return {json, #{<<"message">> => <<"TODO">>}}
• create/1 returns {status, 201, #{}, #{<<"message">> => <<"TODO">>}}
• delete/1 returns {status, 204}

If the file already exists, the command skips it with a warning.

nova gen_router — Generate a router module

Scaffolds a router module implementing the nova_router behaviour with an empty routes list.

$ rebar3 nova gen_router --name api_v1 --prefix /api/v1
===> Created src/myapp_api_v1_router.erl

Options:

Flag	Required	Default	Description
--name, -n	yes	—	Router name
--prefix, -p	no	""	URL prefix for routes

nova gen_resource — Generate a full resource

Combines controller generation, JSON schema creation, and prints route snippets to add to your router.

$ rebar3 nova gen_resource --name products
===> Created src/controllers/myapp_products_controller.erl
===> Created priv/schemas/product.json
===>
===> Add these routes to your router:
===>   {<<"/products">>, {myapp_products_controller, list}, #{methods => [get]}}
===>   {<<"/products/:id">>, {myapp_products_controller, show}, #{methods => [get]}}
===>   {<<"/products">>, {myapp_products_controller, create}, #{methods => [post]}}
===>   {<<"/products/:id">>, {myapp_products_controller, update}, #{methods => [put]}}
===>   {<<"/products/:id">>, {myapp_products_controller, delete}, #{methods => [delete]}}

Options: Same as gen_controller.

The JSON schema is placed in priv/schemas/{singular}.json with id and name fields as a starting point. The resource name is naively singularized by stripping a trailing "s".

nova gen_test — Generate a Common Test suite

Scaffolds a CT suite with test cases for CRUD actions using httpc.

$ rebar3 nova gen_test --name users
===> Created test/myapp_users_controller_SUITE.erl

Options:

Flag	Required	Default	Description
--name, -n	yes	—	Resource name

The generated suite starts inets and the application in init_per_suite, then tests each CRUD endpoint against http://localhost:8080/{name}.

nova openapi — Generate OpenAPI 3.0.3 spec

Generates an OpenAPI 3.0.3 JSON specification from compiled routes and any JSON schemas found in priv/schemas/.

$ rebar3 nova openapi
===> OpenAPI spec written to openapi.json
===> Swagger UI written to swagger.html

$ rebar3 nova openapi --output priv/assets/openapi.json --title "My API" --api-version 1.0.0

Options:

Flag	Required	Default	Description
--output, -o	no	openapi.json	Output file path
--title, -t	no	app name	API title
--api-version, -v	no	0.1.0	API version string

A swagger.html file is also generated alongside the spec for quick browser-based exploration.

nova middleware — Show plugin/middleware chains

Displays global plugins and per-route-group plugin chains, preserving the grouping defined in your router's routes/1 function.

$ rebar3 nova middleware

=== Global Plugins ===
  (none)

=== Route Groups (myapp_router) ===

  Group: prefix=/  security=false
  Plugins:
    (inherits global: none)
  Routes:
    GET /heartbeat -> myapp_health_controller:heartbeat
    GET /health -> myapp_health_controller:health

  Group: prefix=/api  security=fun myapp_auth:validate_token/1
  Plugins:
    pre_request: nova_cors_plugin #{allow_origins => <<"*">>}
    pre_request: nova_request_logger #{level => info}
  Routes:
    GET /users -> myapp_users_controller:list
    POST /users -> myapp_users_controller:create

Groups that don't specify their own plugins key inherit from the global Nova plugin configuration.

nova config — Show Nova configuration

Displays all Nova configuration keys read from sys.config, showing current values or (default) when using built-in defaults.

$ rebar3 nova config

=== Nova Configuration ===

  bootstrap_application     myapp
  environment               dev
  cowboy_configuration       #{port => 8080} (default)
  plugins                   [] (default)
  json_lib                  thoas (default)
  use_stacktrace            false (default)
  dispatch_backend          persistent_term (default)

Warns if bootstrap_application is not set.

nova audit — Audit route security

Checks compiled routes for common security issues and prints findings grouped by severity.

$ rebar3 nova audit

=== Security Audit ===

  WARNINGS:
    POST /users (myapp_users_controller) has no security
    PUT /users/1 (myapp_users_controller) has no security
    DELETE /users/1 (myapp_users_controller) has no security

  INFO:
    GET /users (myapp_users_controller) has no security
    GET /health (myapp_health_controller) has no security

  Summary: 3 warning(s), 2 info(s)

Rules checked:

• Warning: Mutation methods (POST, PUT, DELETE, PATCH) without a security callback
• Warning: Wildcard method ('_') matching all HTTP methods on a route
• Info: GET routes without a security callback

nova release — Build a release

Wraps the standard rebar3 release provider. If priv/schemas/ exists, regenerates the OpenAPI spec before building.

$ rebar3 nova release
===> Regenerating OpenAPI spec...
===> Release built successfully with profile 'prod'

$ rebar3 nova release --profile staging

Options:

Flag	Required	Default	Description
--profile, -p	no	prod	Release profile to use