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[AWS][Lambda] S3に put object されたら自動的に Lambda で Expires ヘッダを追加する ref: http://qiita.com/wokamoto/items/85506f44b16cd0dfea32
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console.log('Loading event'); | |
var aws = require('aws-sdk'); | |
var s3 = new aws.S3({apiVersion: '2006-03-01'}); | |
exports.handler = function(event, context) { | |
console.log('Received event:'); | |
console.log(JSON.stringify(event, null, ' ')); | |
// Get the object from the event and show its content type | |
var bucket = event.Records[0].s3.bucket.name; | |
var key = event.Records[0].s3.object.key; | |
s3.getObject({Bucket:bucket, Key:key}, | |
function(err,data) { | |
if (err) { | |
console.log('error getting object ' + key + ' from bucket ' + bucket + | |
'. Make sure they exist and your bucket is in the same region as this function.'); | |
context.done('error','error getting file'+err); | |
} | |
else { | |
console.log('logging Cache-Control : ',data.CacheControl); | |
if (typeof data.CacheControl != 'undefined'){ | |
console.log('cache control was already exists.'); | |
context.done(null,'skip execution.'); | |
}else { | |
var Expires = new Date(); | |
var ContentType = data.ContentType ? data.ContentType : 'application/octet-stream'; | |
var CacheControl = 1; | |
// set expires date | |
switch( true ){ | |
case /html/.test(ContentType): | |
CacheControl = 1; // 1day | |
break; | |
case /^(image|video|audio)\//.test(ContentType): | |
CacheControl = 365; // 1year | |
break; | |
case /(javascript|css|text)/.test(ContentType): | |
CacheControl = 30; // 1month | |
break; | |
case /^application/.test(ContentType): | |
CacheControl = 30; // 1month | |
break; | |
} | |
Expires.setDate(Expires.getDate() + CacheControl); | |
var params = { | |
Bucket: bucket, /* required */ | |
CopySource: bucket + "/" + key, | |
Key: key, /* required */ | |
ContentType: ContentType, | |
Expires: Expires, | |
CacheControl: "max-age="+(86400 * CacheControl).toString(), | |
MetadataDirective: "REPLACE" | |
}; | |
console.log('replace object.'); | |
console.log('bucket : ' + bucket); | |
console.log('CopySource : ' + bucket + "/" + key); | |
s3.copyObject(params, function(err2, data2){ | |
if (err2){ | |
context.done('error','error2 getting file'+err2); | |
}else{ | |
console.log('replace done! Cache-Control : ',data2.CacheControl); | |
} | |
context.done(null,'object meta-data changed.'); | |
}); | |
} | |
} | |
} | |
); | |
}; |
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