engine/app/uploaders/theme_asset_uploader.rb

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# encoding: utf-8
class ThemeAssetUploader < AssetUploader
process :set_content_type
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process :set_size
process :set_width_and_height
def store_dir
self.build_store_dir('sites', (model.site_id_was || model.site_id).to_s, 'theme', model.folder_was || model.folder)
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end
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def stale_model?
!model.new_record? && model.folder_changed?
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end
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def extension_white_list
%w(jpg jpeg gif png css js swf flv eot svg ttf woff otf ico)
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end
def self.url_for(site, path)
build(site, path).url
end
def self.build(site, path)
asset = ThemeAsset.new(:site => site, :folder => File.dirname(path))
uploader = ThemeAssetUploader.new(asset)
uploader.retrieve_from_store!(File.basename(path))
uploader
end
end