mirror of
https://github.com/discourse/discourse.git
synced 2024-11-23 20:20:43 +08:00
59 lines
1.6 KiB
Ruby
59 lines
1.6 KiB
Ruby
class StylesheetsController < ApplicationController
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skip_before_filter :preload_json, :redirect_to_login_if_required, :check_xhr, :verify_authenticity_token, only: [:show]
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def show
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no_cookies
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target,digest = params[:name].split(/_([a-f0-9]{40})/)
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cache_time = request.env["HTTP_IF_MODIFIED_SINCE"]
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cache_time = Time.rfc2822(cache_time) rescue nil if cache_time
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query = StylesheetCache.where(target: target)
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if digest
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query = query.where(digest: digest)
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else
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query = query.order('id desc')
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end
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# Security note, safe due to route constraint
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underscore_digest = digest ? "_" + digest : ""
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location = "#{Rails.root}/#{DiscourseStylesheets::CACHE_PATH}/#{target}#{underscore_digest}.css"
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stylesheet_time = query.pluck(:created_at).first
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if !stylesheet_time
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handle_missing_cache(location, target, digest)
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end
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if cache_time && stylesheet_time && stylesheet_time <= cache_time
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return render nothing: true, status: 304
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end
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unless File.exist?(location)
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if current = query.first
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File.write(location, current.content)
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else
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raise Discourse::NotFound
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end
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end
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response.headers['Last-Modified'] = stylesheet_time.httpdate if stylesheet_time
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expires_in 1.year, public: true unless Rails.env == "development"
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send_file(location, disposition: :inline)
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end
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protected
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def handle_missing_cache(location, name, digest)
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existing = File.read(location) rescue nil
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if existing && digest
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StylesheetCache.add(name, digest, existing)
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end
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end
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end
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