heroku - Caching signed S3 URI's with paperclip and rails -

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i'm generating expiring signed uri's paperclip on s3. on every request generate new uri not ideal , forces browser download new set of images s3 on every page refresh.

what i'd cache generated uri's little less time expire on s3. has done before , can suggest solution.

i'm deploying on heroku if suggests solution ( or not )

there easy way quite neat. paperclip expiring_url method takes explicit time. can like

  def s3_expiry         time.zone.now.beginning_of_day.since 25.hours   end

and when need expiring url

 user.avatar.expiring_url(s3_expiry, :thumb)

the trick image expired in s3 @ end of day + 1 hour url generated until end of day. new url's generated @ 12:00 midnight every night. prevents images being used off site more 25 hours should enough prevent rampant hot linking still enough allow browsers cache images day


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