[add] added public mode

app/controllers/clients_controller.rb

@@ -3,11 +3,12 @@
 require 'resolv'
 
 class ClientsController < ApplicationController
-  before_action :parse_api_key_header, except: [:show_public_ipv4]
-  before_action :authenticate_client, except: [:show_public_ipv4]
+  before_action :parse_api_key_header, except: %i[show_public_ipv4 create_public_ipv4]
+  before_action :authenticate_client, except: %i[show_public_ipv4 create_public_ipv4]
   before_action :authorize_perm_r, only: [:show_ipv4]
   before_action :authorize_perm_w, only: %i[update_ipv4 destroy_ipv4]
   before_action :authorize_perm_x, only: %i[create update index show destroy]
+  before_action :authorize_public, only: [:create_public_ipv4] if ENV['RAILS_API_PUBLIC']
   before_action :client_authorized, except: [:show_public_ipv4]
   before_action :demo, only: %i[create update destroy] if ENV['RAILS_API_DEMO']
 
@@ -129,6 +130,29 @@ class ClientsController < ApplicationController
     json_response(client_read_object(client))
   end
 
+  # POST /public/:id
+  def create_public_ipv4
+    ipv4 = request_ip
+
+    # return 406 if body with invalid ipv4 is present
+    # TODO: move this into the model (update)
+    return head(406) unless ipv4
+
+    client_params = params.permit(:name)
+    client = Client.find_by name: params[:name]
+    status_code = client ? 200 : 201
+
+    # create new client or update existing
+    if client.nil?
+      client ||= Client.new_client(client_params)
+      return head(429) if client.nil? # reached max client count
+    end
+    client.public_ip = true
+    client.ipv4 = ipv4
+    client.save
+    json_response(client_read_object(client), status_code)
+  end
+
   private
 
   # helper methods
@@ -215,6 +239,10 @@ class ClientsController < ApplicationController
     @authorized = @requesting_client.admin?
   end
 
+  def authorize_public
+    @authorized = true
+  end
+
   # check if request is authorized
   def client_authorized
     return head(403) unless @authorized