Introduce site option to enable put saver

I chose not to support this for Tiddlyspot sites. There's no
technical reason not to I guess, but I don't want to invest time
adding and testing this kind of new feature for legacy Tiddlyspot
sites.

Rolling it out as an option allows it to be soft-launched as a kind
of tech preview. Maybe in future it will become the default saving
method, but not immediately.

The option doesn't do anything yet, but see next commit.

rails/app/controllers/sites_controller.rb

@@ -112,14 +112,14 @@ def set_empties_list
   def site_params_for_create
     params.
       require(:site).
-      permit(:name, :description, :is_private, :is_searchable, :tag_list, :allow_in_iframe, :empty_id).
+      permit(:name, :description, :is_private, :is_searchable, :tag_list, :allow_in_iframe, :enable_put_saver, :empty_id).
       merge(user_id: current_user.id)
   end
 
   def site_params_for_update
     params.
       require(:site).
-      permit(:name, :description, :is_private, :is_searchable, :tag_list, :allow_in_iframe)
+      permit(:name, :description, :is_private, :is_searchable, :tag_list, :allow_in_iframe, :enable_put_saver)
   end
 
   def site_params_for_upload

rails/app/views/sites/_form.html.haml

@@ -58,6 +58,14 @@
       .form-text
         %h5 Advanced settings
 
+    =render layout: 'field_wrapper' do
+      .form-check
+        =f.check_box :enable_put_saver, class: 'form-check-input'
+        =f.label :enable_put_saver, 'Enable put saver', class: 'form-check-label'
+      .form-text
+        Save to Tiddlyhost using the 'put' saver instead of the legacy 'upload' saver.
+        Works best with TiddlyWiki 5.2.3 or higher.
+
     =render 'site_common/allow_in_iframe', f: f
 
     =render layout: 'field_wrapper', locals: { pt: 'pt-5' } do

rails/db/migrate/20220404022507_add_put_saver_option_to_sites.rb

@@ -0,0 +1,5 @@
+class AddPutSaverOptionToSites < ActiveRecord::Migration[6.1]
+  def change
+    add_column :sites, :enable_put_saver, :boolean, default: false
+  end
+end

rails/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2022_03_30_234401) do
+ActiveRecord::Schema.define(version: 2022_04_04_022507) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -70,6 +70,7 @@
     t.integer "raw_byte_size"
     t.string "tw_version"
     t.boolean "allow_in_iframe", default: false
+    t.boolean "enable_put_saver", default: false
     t.index ["empty_id"], name: "index_sites_on_empty_id"
     t.index ["name"], name: "index_sites_on_name", unique: true
     t.index ["user_id"], name: "index_sites_on_user_id"