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https://github.com/discourse/discourse.git
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150f5694dc
In some situations, the filesystem cache will be read and persisted to the database. If the file being read is still being written, then that can lead to empty/partial caches being stored in the database. This commit ensures that cannot happen by switching to our `atomic_write_file` helper (which writes to a temp file, and then does an atomic `mv` operation to move it to the destination)
110 lines
2.8 KiB
Ruby
110 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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class StylesheetsController < ApplicationController
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skip_before_action :preload_json,
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:redirect_to_login_if_required,
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:redirect_to_profile_if_required,
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:check_xhr,
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:verify_authenticity_token,
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only: %i[show show_source_map color_scheme]
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before_action :apply_cdn_headers, only: %i[show show_source_map color_scheme]
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def show_source_map
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show_resource(source_map: true)
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end
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def show
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is_asset_path
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show_resource
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end
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def color_scheme
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params.require("id")
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params.permit("theme_id")
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manager = Stylesheet::Manager.new(theme_id: params[:theme_id])
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stylesheet = manager.color_scheme_stylesheet_details(params[:id], "all")
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render json: stylesheet
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end
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protected
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def show_resource(source_map: false)
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extension = source_map ? ".css.map" : ".css"
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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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if cache_time.present?
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begin
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cache_time = Time.rfc2822(cache_time)
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rescue ArgumentError
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end
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end
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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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cache_path = Stylesheet::Manager.cache_fullpath
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location = "#{cache_path}/#{target}#{underscore_digest}#{extension}"
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stylesheet_time = query.pick(:created_at)
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handle_missing_cache(location, target, digest) if !stylesheet_time
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if cache_time.present? && stylesheet_time && stylesheet_time <= cache_time
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return render body: nil, status: 304
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end
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unless File.exist?(location)
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if current = query.pick(source_map ? :source_map : :content)
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FileUtils.mkdir_p(cache_path)
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Discourse::Utils.atomic_write_file(location, current)
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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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if Rails.env == "development"
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response.headers["Last-Modified"] = Time.zone.now.httpdate
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immutable_for(1.second)
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else
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response.headers["Last-Modified"] = stylesheet_time.httpdate if stylesheet_time
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immutable_for(1.year)
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end
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send_file(location, disposition: :inline)
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end
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def handle_missing_cache(location, name, digest)
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location = location.sub(".css.map", ".css")
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source_map_location = location + ".map"
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existing = read_file(location)
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if existing && digest
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source_map = read_file(source_map_location)
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StylesheetCache.add(name, digest, existing, source_map)
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end
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end
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private
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def read_file(location)
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begin
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File.read(location)
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rescue Errno::ENOENT
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end
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end
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end
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