Created
August 20, 2018 12:47
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Multi Origin Cloudfront (using Lambda@Edge)
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"use strict"; | |
const { promisify } = require('util'); | |
const { resolveCname } = require('dns'); | |
const resolveCnameAsync = promisify(resolveCname); | |
let resultCache = null; | |
const deferClearCache = () => setTimeout(() => { resultCache = null }, 1000); | |
const resolve = async () => { | |
if (resultCache) { | |
return resultCache; | |
} | |
const result = await resolveCnameAsync('blahblah.host.com'); | |
if (result[0].includes('us-east-1')) { | |
resultCache = ['us-east-1', 'east-bucket']; | |
} else { | |
resultCache = ['us-west-2', 'west-bucket']; | |
} | |
deferClearCache(); | |
return resultCache; | |
}; | |
exports.handler = async event => { | |
const request = event.Records[0].cf.request; | |
const [region, bucket] = await resolve(); | |
const domainName = `${bucket}.s3.${region}.amazonaws.com`; | |
request.origin = { | |
s3: { | |
domainName, | |
region, | |
authMethod: 'none', | |
path: '', | |
} | |
}; | |
request.headers['host'] = [{ key: 'host', value: domainName }]; | |
return request; | |
}; |
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