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142571bba0
* `rescue nil` is a really bad pattern to use in our code base. We should rescue errors that we expect the code to throw and not rescue everything because we're unsure of what errors the code would throw. This would reduce the amount of pain we face when debugging why something isn't working as expexted. I've been bitten countless of times by errors being swallowed as a result during debugging sessions.
109 lines
2.8 KiB
Ruby
109 lines
2.8 KiB
Ruby
class StylesheetsController < ApplicationController
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skip_before_action :preload_json, :redirect_to_login_if_required, :check_xhr, :verify_authenticity_token, only: [:show, :show_source_map]
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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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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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params[:name]
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no_cookies
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target, digest = params[:name].split(/_([a-f0-9]{40})/)
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if !Rails.env.production?
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# TODO add theme
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# calling this method ensures we have a cache for said target
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# we hold of re-compilation till someone asks for asset
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if target.include?("theme")
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split_target, theme_id = target.split(/_(-?[0-9]+)/)
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theme = Theme.find(theme_id) if theme_id
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else
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split_target, color_scheme_id = target.split(/_(-?[0-9]+)/)
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theme = Theme.find_by(color_scheme_id: color_scheme_id)
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end
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Stylesheet::Manager.stylesheet_link_tag(split_target, nil, theme&.key)
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end
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cache_time = request.env["HTTP_IF_MODIFIED_SINCE"]
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if cache_time
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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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location = "#{Rails.root}/#{Stylesheet::Manager::CACHE_PATH}/#{target}#{underscore_digest}#{extension}"
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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 body: nil, status: 304
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end
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unless File.exist?(location)
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if current = query.limit(1).pluck(source_map ? :source_map : :content).first
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File.write(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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