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cedcdb0057
Due to default CSP web workers instantiated from CDN based assets are still
treated as "same-origin" meaning that we had no way of safely instansiating
a web worker from a theme.
This limits the theme system and adds the arbitrary restriction that WASM
based components can not be safely used.
To resolve this limitation all js assets in about.json are also cached on
local domain.
{
"name": "Header Icons",
"assets" : {
"worker" : "assets/worker.js"
}
}
This can then be referenced in JS via:
settings.theme_uploads_local.worker
local_js_assets are unconditionally served from the site directly and
bypass the entire CDN, using the pre-existing JavascriptCache
Previous to this change this code was completely dormant on sites which
used s3 based uploads, this reuses the very well tested and cached asset
system on s3 based sites.
Note, when creating local_js_assets it is highly recommended to keep the
assets lean and keep all the heavy working in CDN based assets. For example
wasm files can still live on the CDN but the lean worker that loads it can
live on local.
This change unlocks wasm in theme components, so wasm is now also allowed
in `theme_authorized_extensions`
* more usages of upload.content
* add a specific test for upload.content
* Adjust logic to ensure that after upgrades we still get a cached local js
on save
635 lines
21 KiB
Ruby
635 lines
21 KiB
Ruby
# frozen_string_literal: true
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class ThemeField < ActiveRecord::Base
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belongs_to :upload
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has_one :javascript_cache, dependent: :destroy
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scope :find_by_theme_ids, ->(theme_ids) {
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return none unless theme_ids.present?
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where(theme_id: theme_ids)
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.joins(
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"JOIN (
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SELECT #{theme_ids.map.with_index { |id, idx| "#{id.to_i} AS theme_id, #{idx} AS theme_sort_column" }.join(" UNION ALL SELECT ")}
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) as X ON X.theme_id = theme_fields.theme_id")
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.order("theme_sort_column")
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}
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scope :filter_locale_fields, ->(locale_codes) {
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return none unless locale_codes.present?
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where(target_id: Theme.targets[:translations], name: locale_codes)
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.joins(DB.sql_fragment(
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"JOIN (
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SELECT * FROM (VALUES #{locale_codes.map { "(?)" }.join(",")}) as Y (locale_code, locale_sort_column)
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) as Y ON Y.locale_code = theme_fields.name",
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*locale_codes.map.with_index { |code, index| [code, index] }
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))
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.order("Y.locale_sort_column")
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}
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scope :find_first_locale_fields, ->(theme_ids, locale_codes) {
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find_by_theme_ids(theme_ids)
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.filter_locale_fields(locale_codes)
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.reorder("X.theme_sort_column", "Y.locale_sort_column")
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.select("DISTINCT ON (X.theme_sort_column) *")
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}
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def self.types
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@types ||= Enum.new(html: 0,
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scss: 1,
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theme_upload_var: 2,
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theme_color_var: 3, # No longer used
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theme_var: 4, # No longer used
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yaml: 5,
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js: 6)
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end
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def self.theme_var_type_ids
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@theme_var_type_ids ||= [2]
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end
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def self.css_theme_type_ids
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@css_theme_type_ids ||= [0, 1]
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end
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def self.force_recompilation!
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find_each do |field|
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field.compiler_version = 0
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field.ensure_baked!
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end
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end
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validates :name, format: { with: /\A[a-z_][a-z0-9_-]*\z/i },
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if: Proc.new { |field| ThemeField.theme_var_type_ids.include?(field.type_id) }
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belongs_to :theme
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def process_html(html)
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errors = []
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javascript_cache || build_javascript_cache
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errors << I18n.t("themes.errors.optimized_link") if contains_optimized_link?(html)
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js_compiler = ThemeJavascriptCompiler.new(theme_id, self.theme.name)
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doc = Nokogiri::HTML5.fragment(html)
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doc.css('script[type="text/x-handlebars"]').each do |node|
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name = node["name"] || node["data-template-name"] || "broken"
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is_raw = name =~ /\.(raw|hbr)$/
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hbs_template = node.inner_html
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begin
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if is_raw
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js_compiler.append_raw_template(name, hbs_template)
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else
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js_compiler.append_ember_template(name, hbs_template)
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end
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rescue ThemeJavascriptCompiler::CompileError => ex
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errors << ex.message
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end
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node.remove
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end
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doc.css('script[type="text/discourse-plugin"]').each_with_index do |node, index|
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version = node['version']
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next if version.blank?
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initializer_name = "theme-field" +
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"-#{self.id}" +
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"-#{Theme.targets[self.target_id]}" +
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"-#{ThemeField.types[self.type_id]}" +
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"-script-#{index + 1}"
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begin
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js = <<~JS
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import { withPluginApi } from "discourse/lib/plugin-api";
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export default {
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name: #{initializer_name.inspect},
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after: "inject-objects",
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initialize() {
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withPluginApi(#{version.inspect}, (api) => {
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#{node.inner_html}
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});
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}
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};
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JS
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js_compiler.append_module(js, "discourse/initializers/#{initializer_name}", include_variables: true)
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rescue ThemeJavascriptCompiler::CompileError => ex
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errors << ex.message
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end
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node.remove
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end
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doc.css('script').each do |node|
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next unless inline_javascript?(node)
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js_compiler.append_raw_script(node.inner_html)
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node.remove
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end
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errors.each do |error|
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js_compiler.append_js_error(error)
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end
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settings_hash = theme.build_settings_hash
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js_compiler.prepend_settings(settings_hash) if js_compiler.content.present? && settings_hash.present?
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javascript_cache.content = js_compiler.content
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javascript_cache.save!
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doc.add_child("<script src='#{javascript_cache.url}' data-theme-id='#{theme_id}'></script>") if javascript_cache.content.present?
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[doc.to_s, errors&.join("\n")]
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end
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def process_extra_js(content)
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errors = []
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js_compiler = ThemeJavascriptCompiler.new(theme_id, theme.name)
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filename, extension = name.split(".", 2)
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filename = "test/#{filename}" if js_tests_field?
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begin
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case extension
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when "js.es6", "js"
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js_compiler.append_module(content, filename, include_variables: true)
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when "hbs"
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js_compiler.append_ember_template(filename.sub("discourse/templates/", ""), content)
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when "hbr", "raw.hbs"
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js_compiler.append_raw_template(filename.sub("discourse/templates/", ""), content)
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else
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raise ThemeJavascriptCompiler::CompileError.new(I18n.t("themes.compile_error.unrecognized_extension", extension: extension))
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end
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rescue ThemeJavascriptCompiler::CompileError => ex
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errors << ex.message
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end
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[js_compiler.content, errors&.join("\n")]
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end
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def validate_svg_sprite_xml
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upload = Upload.find(self.upload_id) rescue nil
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if Discourse.store.external?
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external_copy = Discourse.store.download(upload) rescue nil
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path = external_copy.try(:path)
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else
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path = Discourse.store.path_for(upload)
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end
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error = nil
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begin
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content = File.read(path)
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Nokogiri::XML(content) do |config|
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config.options = Nokogiri::XML::ParseOptions::NOBLANKS
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end
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rescue => e
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error = "Error with #{self.name}: #{e.inspect}"
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end
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error
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end
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def raw_translation_data(internal: false)
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# Might raise ThemeTranslationParser::InvalidYaml
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ThemeTranslationParser.new(self, internal: internal).load
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end
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def translation_data(with_overrides: true, internal: false, fallback_fields: nil)
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fallback_fields ||= theme.theme_fields.filter_locale_fields(I18n.fallbacks[name])
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fallback_data = fallback_fields.each_with_index.map do |field, index|
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begin
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field.raw_translation_data(internal: internal)
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rescue ThemeTranslationParser::InvalidYaml
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# If this is the locale with the error, raise it.
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# If not, let the other theme_field raise the error when it processes itself
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raise if field.id == id
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{}
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end
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end
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# TODO: Deduplicate the fallback data in the same way as JSLocaleHelper#load_translations_merged
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# this would reduce the size of the payload, without affecting functionality
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data = {}
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fallback_data.each { |hash| data.merge!(hash) }
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if with_overrides
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overrides = theme.translation_override_hash.deep_symbolize_keys
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data.deep_merge!(overrides)
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end
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data
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end
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def process_translation
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errors = []
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javascript_cache || build_javascript_cache
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js_compiler = ThemeJavascriptCompiler.new(theme_id, self.theme.name)
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begin
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data = translation_data
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js = <<~JS
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export default {
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name: "theme-#{theme_id}-translations",
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initialize() {
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/* Translation data for theme #{self.theme_id} (#{self.name})*/
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const data = #{data.to_json};
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for (let lang in data){
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let cursor = I18n.translations;
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for (let key of [lang, "js", "theme_translations"]){
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cursor = cursor[key] = cursor[key] || {};
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}
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cursor[#{self.theme_id}] = data[lang];
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}
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}
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};
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JS
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js_compiler.append_module(js, "discourse/pre-initializers/theme-#{theme_id}-translations", include_variables: false)
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rescue ThemeTranslationParser::InvalidYaml => e
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errors << e.message
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end
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javascript_cache.content = js_compiler.content
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javascript_cache.save!
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doc = ""
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doc = "<script src='#{javascript_cache.url}' data-theme-id='#{theme_id}'></script>" if javascript_cache.content.present?
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[doc, errors&.join("\n")]
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end
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def validate_yaml!
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return unless self.name == "yaml"
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errors = []
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begin
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ThemeSettingsParser.new(self).load do |name, default, type, opts|
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setting = ThemeSetting.new(name: name, data_type: type, theme: theme)
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translation_key = "themes.settings_errors"
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if setting.invalid?
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setting.errors.details.each_pair do |attribute, _errors|
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_errors.each do |hash|
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errors << I18n.t("#{translation_key}.#{attribute}_#{hash[:error]}", name: name)
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end
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end
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end
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if default.nil?
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errors << I18n.t("#{translation_key}.default_value_missing", name: name)
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end
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if (min = opts[:min]) && (max = opts[:max])
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unless ThemeSetting.value_in_range?(default, (min..max), type)
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errors << I18n.t("#{translation_key}.default_out_range", name: name)
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end
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end
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unless ThemeSetting.acceptable_value_for_type?(default, type)
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errors << I18n.t("#{translation_key}.default_not_match_type", name: name)
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end
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end
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rescue ThemeSettingsParser::InvalidYaml => e
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errors << e.message
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end
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self.error = errors.join("\n").presence
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end
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def self.guess_type(name:, target:)
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if basic_targets.include?(target.to_s) && html_fields.include?(name.to_s)
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types[:html]
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elsif basic_targets.include?(target.to_s) && scss_fields.include?(name.to_s)
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types[:scss]
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elsif target.to_s == "extra_scss"
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types[:scss]
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elsif target.to_s == "extra_js"
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types[:js]
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elsif target.to_s == "settings" || target.to_s == "translations"
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types[:yaml]
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end
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end
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def self.html_fields
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@html_fields ||= %w(body_tag head_tag header footer after_header)
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end
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def self.scss_fields
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@scss_fields ||= %w(scss embedded_scss color_definitions)
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end
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def self.basic_targets
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@basic_targets ||= %w(common desktop mobile)
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end
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def basic_html_field?
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ThemeField.basic_targets.include?(Theme.targets[self.target_id].to_s) &&
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ThemeField.html_fields.include?(self.name)
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end
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def extra_js_field?
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Theme.targets[self.target_id] == :extra_js
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end
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def js_tests_field?
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Theme.targets[self.target_id] == :tests_js
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end
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def basic_scss_field?
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ThemeField.basic_targets.include?(Theme.targets[self.target_id].to_s) &&
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ThemeField.scss_fields.include?(self.name)
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end
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def extra_scss_field?
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Theme.targets[self.target_id] == :extra_scss
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end
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def settings_field?
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Theme.targets[:settings] == self.target_id
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end
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def translation_field?
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Theme.targets[:translations] == self.target_id
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end
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def svg_sprite_field?
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ThemeField.theme_var_type_ids.include?(self.type_id) && self.name == SvgSprite.theme_sprite_variable_name
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end
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def ensure_baked!
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needs_baking = !self.value_baked || compiler_version != Theme.compiler_version
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return unless needs_baking
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if basic_html_field? || translation_field?
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self.value_baked, self.error = translation_field? ? process_translation : process_html(self.value)
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self.error = nil unless self.error.present?
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self.compiler_version = Theme.compiler_version
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DB.after_commit { CSP::Extension.clear_theme_extensions_cache! }
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elsif extra_js_field? || js_tests_field?
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self.value_baked, self.error = process_extra_js(self.value)
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self.error = nil unless self.error.present?
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self.compiler_version = Theme.compiler_version
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elsif basic_scss_field?
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ensure_scss_compiles!
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DB.after_commit { Stylesheet::Manager.clear_theme_cache! }
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elsif settings_field?
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validate_yaml!
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DB.after_commit { CSP::Extension.clear_theme_extensions_cache! }
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DB.after_commit { SvgSprite.expire_cache }
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self.value_baked = "baked"
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self.compiler_version = Theme.compiler_version
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elsif svg_sprite_field?
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DB.after_commit { SvgSprite.expire_cache }
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self.error = validate_svg_sprite_xml
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self.value_baked = "baked"
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self.compiler_version = Theme.compiler_version
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end
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if self.will_save_change_to_value_baked? ||
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self.will_save_change_to_compiler_version? ||
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self.will_save_change_to_error?
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self.update_columns(value_baked: value_baked,
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compiler_version: compiler_version,
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error: error)
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end
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end
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def compile_scss(prepended_scss = nil)
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prepended_scss ||= Stylesheet::Importer.new({}).prepended_scss
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self.theme.with_scss_load_paths do |load_paths|
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Stylesheet::Compiler.compile("#{prepended_scss} #{self.theme.scss_variables.to_s} #{self.value}",
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"#{Theme.targets[self.target_id]}.scss",
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theme: self.theme,
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load_paths: load_paths
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)
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end
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end
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def compiled_css(prepended_scss)
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css, _source_map = begin
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compile_scss(prepended_scss)
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rescue SassC::SyntaxError => e
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# We don't want to raise a blocking error here
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# admin theme editor or discourse_theme CLI will show it nonetheless
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Rails.logger.error "SCSS compilation error: #{e.message}"
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["", nil]
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end
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css
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end
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def ensure_scss_compiles!
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result = ["failed"]
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begin
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result = compile_scss
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if contains_optimized_link?(self.value)
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self.error = I18n.t("themes.errors.optimized_link")
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elsif contains_ember_css_selector?(self.value)
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self.error = I18n.t("themes.ember_selector_error")
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else
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self.error = nil unless error.nil?
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end
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rescue SassC::SyntaxError => e
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self.error = e.message unless self.destroyed?
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end
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self.compiler_version = Theme.compiler_version
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self.value_baked = Digest::SHA1.hexdigest(result.join(",")) # We don't use the compiled CSS here, we just use it to invalidate the stylesheet cache
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end
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def target_name
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Theme.targets[target_id].to_s
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end
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def contains_optimized_link?(text)
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OptimizedImage::URL_REGEX.match?(text)
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end
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def contains_ember_css_selector?(text)
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text.match(/#ember\d+|[.]ember-view/)
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end
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class ThemeFileMatcher
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OPTIONS = %i{name type target}
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# regex: used to match file names to fields (import).
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# can contain named capture groups for name/type/target
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# canonical: a lambda which converts name/type/target
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# to filename (export)
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# targets/names/types: can be nil if any value is allowed
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# single value
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# array of allowed values
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def initialize(regex:, canonical:, targets:, names:, types:)
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@allowed_values = {}
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@allowed_values[:names] = Array(names) if names
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@allowed_values[:targets] = Array(targets) if targets
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@allowed_values[:types] = Array(types) if types
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@canonical = canonical
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@regex = regex
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end
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def opts_from_filename(filename)
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match = @regex.match(filename)
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return false unless match
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hash = {}
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OPTIONS.each do |option|
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plural = :"#{option}s"
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hash[option] = @allowed_values[plural][0] if @allowed_values[plural]&.length == 1
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hash[option] = match[option] if hash[option].nil?
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end
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hash
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end
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def filename_from_opts(opts)
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is_match = OPTIONS.all? do |option|
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plural = :"#{option}s"
|
|
next true if @allowed_values[plural] == nil # Allows any value
|
|
next true if @allowed_values[plural].include?(opts[option]) # Value is allowed
|
|
end
|
|
is_match ? @canonical.call(opts) : nil
|
|
end
|
|
end
|
|
|
|
FILE_MATCHERS = [
|
|
ThemeFileMatcher.new(regex: /^(?<target>(?:mobile|desktop|common))\/(?<name>(?:head_tag|header|after_header|body_tag|footer))\.html$/,
|
|
targets: [:mobile, :desktop, :common], names: ["head_tag", "header", "after_header", "body_tag", "footer"], types: :html,
|
|
canonical: -> (h) { "#{h[:target]}/#{h[:name]}.html" }),
|
|
ThemeFileMatcher.new(regex: /^(?<target>(?:mobile|desktop|common))\/(?:\k<target>)\.scss$/,
|
|
targets: [:mobile, :desktop, :common], names: "scss", types: :scss,
|
|
canonical: -> (h) { "#{h[:target]}/#{h[:target]}.scss" }),
|
|
ThemeFileMatcher.new(regex: /^common\/embedded\.scss$/,
|
|
targets: :common, names: "embedded_scss", types: :scss,
|
|
canonical: -> (h) { "common/embedded.scss" }),
|
|
ThemeFileMatcher.new(regex: /^common\/color_definitions\.scss$/,
|
|
targets: :common, names: "color_definitions", types: :scss,
|
|
canonical: -> (h) { "common/color_definitions.scss" }),
|
|
ThemeFileMatcher.new(regex: /^(?:scss|stylesheets)\/(?<name>.+)\.scss$/,
|
|
targets: :extra_scss, names: nil, types: :scss,
|
|
canonical: -> (h) { "stylesheets/#{h[:name]}.scss" }),
|
|
ThemeFileMatcher.new(regex: /^javascripts\/(?<name>.+)$/,
|
|
targets: :extra_js, names: nil, types: :js,
|
|
canonical: -> (h) { "javascripts/#{h[:name]}" }),
|
|
ThemeFileMatcher.new(regex: /^test\/(?<name>.+)$/,
|
|
targets: :tests_js, names: nil, types: :js,
|
|
canonical: -> (h) { "test/#{h[:name]}" }),
|
|
ThemeFileMatcher.new(regex: /^settings\.ya?ml$/,
|
|
names: "yaml", types: :yaml, targets: :settings,
|
|
canonical: -> (h) { "settings.yml" }),
|
|
ThemeFileMatcher.new(regex: /^locales\/(?<name>(?:#{I18n.available_locales.join("|")}))\.yml$/,
|
|
names: I18n.available_locales.map(&:to_s), types: :yaml, targets: :translations,
|
|
canonical: -> (h) { "locales/#{h[:name]}.yml" }),
|
|
ThemeFileMatcher.new(regex: /(?!)/, # Never match uploads by filename, they must be named in about.json
|
|
names: nil, types: :theme_upload_var, targets: :common,
|
|
canonical: -> (h) { "assets/#{h[:name]}#{File.extname(h[:filename])}" }),
|
|
]
|
|
|
|
# For now just work for standard fields
|
|
def file_path
|
|
FILE_MATCHERS.each do |matcher|
|
|
if filename = matcher.filename_from_opts(target: target_name.to_sym,
|
|
name: name,
|
|
type: ThemeField.types[type_id],
|
|
filename: upload&.original_filename)
|
|
return filename
|
|
end
|
|
end
|
|
nil # Not a file (e.g. a theme variable/color)
|
|
end
|
|
|
|
def self.opts_from_file_path(filename)
|
|
FILE_MATCHERS.each do |matcher|
|
|
if opts = matcher.opts_from_filename(filename)
|
|
return opts
|
|
end
|
|
end
|
|
nil
|
|
end
|
|
|
|
def dependent_fields
|
|
if extra_scss_field?
|
|
return theme.theme_fields.where(target_id: ThemeField.basic_targets.map { |t| Theme.targets[t.to_sym] },
|
|
name: ThemeField.scss_fields)
|
|
elsif settings_field?
|
|
return theme.theme_fields.where(target_id: ThemeField.basic_targets.map { |t| Theme.targets[t.to_sym] },
|
|
name: ThemeField.scss_fields + ThemeField.html_fields)
|
|
end
|
|
ThemeField.none
|
|
end
|
|
|
|
def invalidate_baked!
|
|
update_column(:value_baked, nil)
|
|
dependent_fields.update_all(value_baked: nil)
|
|
end
|
|
|
|
before_save do
|
|
if (will_save_change_to_value? || will_save_change_to_upload_id?) && !will_save_change_to_value_baked?
|
|
self.value_baked = nil
|
|
end
|
|
if upload && upload.extension == "js"
|
|
if will_save_change_to_upload_id? || !javascript_cache
|
|
javascript_cache ||= build_javascript_cache
|
|
javascript_cache.content = upload.content
|
|
end
|
|
end
|
|
end
|
|
|
|
after_save do
|
|
dependent_fields.each(&:invalidate_baked!)
|
|
end
|
|
|
|
after_commit do
|
|
# TODO message for mobile vs desktop
|
|
MessageBus.publish "/header-change/#{theme.id}", self.value if theme && self.name == "header"
|
|
MessageBus.publish "/footer-change/#{theme.id}", self.value if theme && self.name == "footer"
|
|
end
|
|
|
|
after_destroy do
|
|
if svg_sprite_field?
|
|
DB.after_commit { SvgSprite.expire_cache }
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
JAVASCRIPT_TYPES = %w(
|
|
text/javascript
|
|
application/javascript
|
|
application/ecmascript
|
|
)
|
|
|
|
def inline_javascript?(node)
|
|
if node['src'].present?
|
|
false
|
|
elsif node['type'].present?
|
|
JAVASCRIPT_TYPES.include?(node['type'].downcase)
|
|
else
|
|
true
|
|
end
|
|
end
|
|
end
|
|
|
|
# == Schema Information
|
|
#
|
|
# Table name: theme_fields
|
|
#
|
|
# id :integer not null, primary key
|
|
# theme_id :integer not null
|
|
# target_id :integer not null
|
|
# name :string(255) not null
|
|
# value :text not null
|
|
# value_baked :text
|
|
# created_at :datetime not null
|
|
# updated_at :datetime not null
|
|
# compiler_version :string(50) default("0"), not null
|
|
# error :string
|
|
# upload_id :integer
|
|
# type_id :integer default(0), not null
|
|
#
|
|
# Indexes
|
|
#
|
|
# theme_field_unique_index (theme_id,target_id,type_id,name) UNIQUE
|
|
#
|