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19af83d39e
This commit introduces the concept of themeable site settings,
which is a new tool for theme authors that lives alongside theme
modifiers and theme settings. Here is a quick summary:
* Theme settings - These are custom settings used to control UI and functionality within your theme or component and provide configuration options. These cannot change core Discourse functionality.
* Theme modifiers - Allows a theme or a component to modify selected server-side functionality of core Discourse as an alternative to building a plugin.
* Themeable site settings (new) - Allows a theme (not components) to override a small subset of core site settings, which generally control parts of the UI and other minor functionality. This allows themes to have a greater control over the full site experience.
Themeable site settings will be shown for all themes, whether the theme
changes
the value or not, and have a similar UI to custom theme settings.
We are also introducing a new page at
`/admin/config/theme-site-settings` that
allows admins to see all possible themeable site settings, and which
themes
are changing the value from the default.
### Configuration
Theme authors can configure initial values themeable site settings using
a section in the `about.json` file like so:
```json
"theme_site_settings": {
"search_experience": "search_field"
}
```
These values will not change when the theme updates, because we cannot
know if admins have manually changed them.
### Limitations
Themeable site settings are only really intended to control elements of
the UI, and when retrieving their value we require a theme ID, so these
limitations apply:
- Themeable site settings cannot be used in Sidekiq jobs
- Themeable site settings cannot be used in markdown rules
- Themeable site settings will be cached separately to client site
settings using theme ID as a key
- Themeable site settings will override keys on the `siteSettings`
service on the client using the application preloader
- `SiteSetting.client_settings_json` will not include themeable site
settings, instead you can call `SiteSetting.theme_site_settings_json`
with a theme ID
### Initial settings
There are only two site settings that will be themeable to begin with:
* `enable_welcome_banner`
* `search_experience`
And our new Horizon theme will take advantage of both. Over time, more
settings that control elements of the UI will be exposed this way.
91 lines
2.8 KiB
Ruby
91 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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# Creates a new theme with the provided parameters. Themes can be created
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# with various attributes including name, user selectability, color scheme,
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# and theme fields.
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#
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# Also used to create theme components.
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#
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# The theme can optionally be set as the default theme, overriding SiteSetting.default_theme_id.
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# The theme will then be used for all users on the site who haven't specifically set their
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# theme preference.
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#
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# @example
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# Themes::Create.call(
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# guardian: guardian,
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# params: {
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# name: "My Theme",
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# user_selectable: true,
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# color_scheme_id: 1,
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# component: false,
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# theme_fields: [
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# { name: "header", target: "common", value: "content", type_id: 1 }
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# ],
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# default: false
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# }
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# )
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#
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class Themes::Create
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include Service::Base
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# @!method self.call(guardian:, params:)
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# @param [Guardian] guardian
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# @param [Hash] params
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# @option params String :name The name of the theme
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# @option params Integer :user_id The ID of the user creating the theme
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# @option params [Boolean] :user_selectable Whether the theme can be selected by users
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# @option params [Integer] :color_scheme_id The ID of the color palette to use
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# @option params [Boolean] :component Whether this is a theme component. These cannot be user_selectable or have a color_scheme_id
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# @option params [Array] :theme_fields Array of theme field attributes
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# @option params [Boolean] :default Whether to set this as the default theme
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# @return [Service::Base::Context]
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params do
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attribute :name, :string
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attribute :user_id, :integer
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attribute :user_selectable, :boolean, default: false
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attribute :color_scheme_id, :integer
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attribute :component, :boolean, default: false
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attribute :theme_fields, :array
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attribute :default, :boolean, default: false
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validates :name, presence: true
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validates :user_id, presence: true
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validates :theme_fields, length: { maximum: 100 }
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end
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policy :ensure_remote_themes_are_not_allowlisted
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transaction do
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model :theme, :create_theme
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step :update_default_theme
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step :log_theme_change
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end
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step :refresh_site_setting_cache
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private
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def ensure_remote_themes_are_not_allowlisted
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Theme.allowed_remote_theme_ids.nil?
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end
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def create_theme(params:)
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Theme.create(
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params.slice(:name, :user_id, :user_selectable, :color_scheme_id, :component),
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) { |theme| params.theme_fields.to_a.each { |field| theme.set_field(**field.symbolize_keys) } }
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end
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def update_default_theme(params:, theme:)
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theme.set_default! if params.default
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end
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def log_theme_change(theme:, guardian:)
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StaffActionLogger.new(guardian.user).log_theme_change(nil, theme)
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end
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def refresh_site_setting_cache
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SiteSetting.refresh!(refresh_site_settings: false, refresh_theme_site_settings: true)
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end
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end
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