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index.js
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index.js
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'use strict';
const AWS = require('aws-sdk');
const S3 = new AWS.S3({
signatureVersion: 'v4',
});
const Sharp = require('sharp');
const BUCKET = process.env.BUCKET;
const URL = process.env.URL;
const ALLOWED_SIZES = process.env.ALLOWED_SIZES;
exports.handler = async (event, context, callback) => {
const key = event.queryStringParameters.key;
const match = key.match(/(.*)_(\d+)x(\d+)\.(.*)/);
const width = parseInt(match[2], 10);
const height = parseInt(match[3], 10);
const originalKey = match[1] + '.' + match[4];
const allowedSizes = ALLOWED_SIZES.replace(/\s+/g, "").split(',');
let deny = false;
if (ALLOWED_SIZES && allowedSizes.length > 0) {
deny = true;
for (let i = 0; i < allowedSizes.length; i++) {
if (!!~allowedSizes[i].indexOf(width + 'x' + height)) {
deny = false;
break;
}
}
}
if (deny) {
callback("not allowed size");
} else {
let contentType = 'image/png';
if (match[4] == 'jpeg' || match[4] == 'jpg') {
contentType = 'image/jpeg';
}
try {
const s3Data = await S3.getObject({
Bucket: BUCKET,
Key: originalKey
}).promise()
const buffer = await Sharp(s3Data.Body).resize(width, height, { fit: 'inside' }).toBuffer()
await S3.putObject({
Body: buffer,
Bucket: BUCKET,
ContentType: contentType,
CacheControl: 'max-age=86400',
Key: key,
}).promise()
callback(null, {
statusCode: '301',
headers: { 'location': `${URL}/${key}` },
body: '',
})
} catch (err) {
callback(err)
}
}
}
const AWS = require('aws-sdk');
const S3 = new AWS.S3({
signatureVersion: 'v4',
});
const Sharp = require('sharp');
const BUCKET = process.env.BUCKET;
const URL = process.env.URL;
const ALLOWED_SIZES = process.env.ALLOWED_SIZES;
exports.handler = async (event, context, callback) => {
const key = event.queryStringParameters.key;
const match = key.match(/(.*)_(\d+)x(\d+)\.(.*)/);
const width = parseInt(match[2], 10);
const height = parseInt(match[3], 10);
const originalKey = match[1] + '.' + match[4];
const allowedSizes = ALLOWED_SIZES.replace(/\s+/g, "").split(',');
let deny = false;
if (ALLOWED_SIZES && allowedSizes.length > 0) {
deny = true;
for (let i = 0; i < allowedSizes.length; i++) {
if (!!~allowedSizes[i].indexOf(width + 'x' + height)) {
deny = false;
break;
}
}
}
if (deny) {
callback("not allowed size");
} else {
let contentType = 'image/png';
if (match[4] == 'jpeg' || match[4] == 'jpg') {
contentType = 'image/jpeg';
}
try {
const s3Data = await S3.getObject({
Bucket: BUCKET,
Key: originalKey
}).promise()
const buffer = await Sharp(s3Data.Body).resize(width, height, { fit: 'inside' }).toBuffer()
await S3.putObject({
Body: buffer,
Bucket: BUCKET,
ContentType: contentType,
CacheControl: 'max-age=86400',
Key: key,
}).promise()
callback(null, {
statusCode: '301',
headers: { 'location': `${URL}/${key}` },
body: '',
})
} catch (err) {
callback(err)
}
}
}