fix directory traversal flaw
fix directory traversal flaw

Tim-Erwin/sanic,yunstanford/sanic,lixxu/sanic,channelcat/sanic,jrocketfingers/sanic,r0fls/sanic,ashleysommer/sanic,Tim-Erwin/sanic,lixxu/sanic,yunstanford/sanic,channelcat/sanic,ashleysommer/sanic,lixxu/sanic,jrocketfingers/sanic,r0fls/sanic,yunstanford/sanic,yunstanford/sanic,lixxu/sanic,ashleysommer/sanic,channelcat/sanic,channelcat/sanic