amazon web services - Given an S3 path and a valid key and secret, how do I update an objects cache-control headers? -


i need update headers on files after uploaded s3. don't have control on upload process (i'm using filepicker.io api doesn't provide way specify cache-control header far now), magically appear in bucket. have full s3 path objects , key , secret bucket.

using go, easiest way add new headers these objects? seems need put copy request requires request signing , overwrites of existing headers. want add cache-control header, there has easier way right?

the small program below should add cache-control header the given bucket / key combo. important bit s3.copyoptions struct. metadatadirective can copy - see http://docs.aws.amazon.com/amazons3/latest/api/restobjectcopy.html details. source must bucket/key since source of course can in bucket. 

package main  import (     "fmt"     "os"      "github.com/goamz/goamz/aws"     "github.com/goamz/goamz/s3"     //// should work     //"github.com/crowdmob/goamz/aws"     //"github.com/crowdmob/goamz/s3" )  func main() {     // use     //  $ go run s3meta.go bucket key     // add 1 hour cache-control header     // key in bucket     auth := aws.auth{         accesskey: os.getenv("aws_access_key_id"),         secretkey: os.getenv("aws_secret_key_id"),     }      bucketname, keyname := os.args[1], os.args[2]      bucket := s3.new(auth, aws.useast).bucket(bucketname)     opts := s3.copyoptions{}     opts.cachecontrol = "maxage=3600"     opts.metadatadirective = "replace"      _, err := bucket.putcopy(keyname, s3.publicread, opts, bucketname+"/"+keyname)     if err != nil {         panic(err)     }  }

trial run (bucket has since been deleted):

╭─brs @ stengaard in ~/ using ╰─○ curl  -i https://s3.amazonaws.com/cf-templates-1r14by1vl75o0-us-east-1/success.png http/1.1 200 ok x-amz-id-2: 49oturarmhlx32nqv34cmojdtmbuczivzp8ykbs2wz5h1w5kbg62u8nfru1ukibj x-amz-request-id: c92e9952bff31d77 date: mon, 30 jun 2014 08:57:15 gmt last-modified: mon, 30 jun 2014 08:50:45 gmt etag: "41b9951893f1bbff89e2b9c8a5b7ea18" accept-ranges: bytes content-type: image/png content-length: 61585 server: amazons3  ╭─brs @ stengaard in ~/ using ╰─○ go run s3meta.go cf-templates-1r14by1vl75o0-us-east-1 success.png ╭─brs @ stengaard in ~/ using ╰─○ curl  -i https://s3.amazonaws.com/cf-templates-1r14by1vl75o0-us-east-1/success.png http/1.1 200 ok x-amz-id-2: oidexjo1v4kquwo8ulnwbi/hahoqfvloshvexfzxv2ya4o0+njcdshhu15piiw7j x-amz-request-id: 0bb1a397de7ebe75 date: mon, 30 jun 2014 09:00:17 gmt cache-control: maxage=3600 last-modified: mon, 30 jun 2014 09:00:12 gmt etag: "41b9951893f1bbff89e2b9c8a5b7ea18" accept-ranges: bytes content-type: binary/octet-stream content-length: 61585 server: amazons3

note content-type changes since have opts.metadatadirective = "replace". if little thing worth hassle of updating headers out-of-band domain specific: how important cache uploaded files in client? expensive head request s3?


Comments

Post a Comment

Popular posts from this blog

javascript - RequestAnimationFrame not working when exiting fullscreen switching space on Safari -

request animation frame stops working when exiting fullscreen clicking on original space's safari window. fine if fullscreen mode canceled escape key or calling cancelfullscreen(). steps reproduce: open https://dl.dropboxusercontent.com/u/769042/prezi/safari-fullscreen.html click "draw raf", kittie appears click "fullscreen", go fullscreen click "draw raf", kittie appears go space original safari was, showing "click exit fullscreen mode", click anywhere, out fullscreen click "draw raf", nothing happens what handling click calling: window.requestanimationframe(draw); which draws on canvas context: function draw() { ctx.drawimage(img, math.random()*500|0, math.random()*400|0, 100, 100); } i checked .hidden , .visibilitystate, updated correctly. tested on osx 10.9.3, safari 7.0.4 (9537.76.4). has workaround/solution other switching old settimeout? this sounds webkit bug 88940 : using reque...
Read more

jsf - How to ajax update an item in the footer of a PrimeFaces dataTable? -

this visual of table have: +---------+------------+-------------------+ | header1 | header2 | header3 | +---------+------------+-------------------+ | row | input | calc'ed output | | row b | input b | calc'ed output b | | etc.. | etc.. | etc.. | +---------+------------+-------------------+ | total: total calc'ed output | +------------------------------------------+ and stripped-down code: <p:datatable id="mytable" value="#{mybean.somelist}" var="currentitem"> <p:column headertext="header1"> <h:outputtext value="#{currentitem.name}" /> </p:column> <p:column headertext="header2"> <pe:inputnumber value="#{currentitem.inputval}"> <p:ajax event="change" listener="#{mybean.changelistener}" update="outputval outputtotal...
Read more

jquery - Keeping Kendo Datepicker in min/max range -

when user types type in date outside of range, we're trying ensure date gets changed closest min/max. text displayed in date picker not change though thought script changing value() @(html.kendo() .datepickerfor(x => x.dob) .max(new datetime(datetime.now.addyears(-18).year, datetime.now.addyears(-18).month, datetime.now.addyears(-18).day)) .min(new datetime(datetime.now.addyears(-70).year, datetime.now.addyears(-70).month, datetime.now.addyears(-70).day)) .events(e=>e.change("ondobchange")) .htmlattributes(new { required = "required", ng_model = "model.dob" })) <p ng-show="validatestate.submitted && frmmain.dob.$invalid" class="help-block">please select</p> <script> function ondobchange(e) { var d...
Read more