50 lines
1.7 KiB
Ruby
50 lines
1.7 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
class HotlinkingDetector
|
|
IMAGE_FORMATS = %w(image/jpeg image/apng image/png image/webp image/svg+xml image/*).freeze
|
|
MEDIA_FORMATS = %w(video/webm video/ogg video/* application/ogg audio/webm audio/ogg audio/wav audio/*).freeze
|
|
CSS_FORMATS = %w(text/css).freeze
|
|
INVALID_FORMATS = (IMAGE_FORMATS + MEDIA_FORMATS + CSS_FORMATS).freeze
|
|
INVALID_FETCH_MODES = %w(cors no-cors websocket).freeze
|
|
|
|
class << self
|
|
def intercept_hotlinking?(request)
|
|
request_accepts = parse_request_accepts(request)
|
|
|
|
# Block attempts to embed as JS
|
|
return true if sec_fetch_invalid?(request)
|
|
|
|
# If no Accept header was set, skip the rest
|
|
return false if request_accepts.empty?
|
|
|
|
# Workaround for IE8 weirdness
|
|
return false if IMAGE_FORMATS.include?(request_accepts.first) && request_accepts.include?("application/x-ms-application")
|
|
|
|
# Block all other media requests if the first format is a media type
|
|
return true if INVALID_FORMATS.include?(request_accepts.first)
|
|
|
|
false
|
|
end
|
|
|
|
private
|
|
|
|
def sec_fetch_invalid?(request)
|
|
fetch_mode = request.headers["Sec-Fetch-Mode"]
|
|
|
|
return if fetch_mode.blank?
|
|
return true if INVALID_FETCH_MODES.include?(fetch_mode)
|
|
end
|
|
|
|
def parse_request_accepts(request)
|
|
# Rails will already have parsed the Accept header
|
|
return request.accepts if request.respond_to?(:accepts)
|
|
|
|
# Grape doesn't parse it, so we can use the Rails system for this
|
|
return Mime::Type.parse(request.headers["Accept"]) if request.respond_to?(:headers) && request.headers["Accept"].present?
|
|
|
|
[]
|
|
end
|
|
end
|
|
end
|
|
end
|