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index.js
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index.js
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const AWS = require('aws-sdk');
const s3 = new AWS.S3({apiVersion: '2006-03-01'});
const { isNumber, toBlockDate, isObject, isError } = require('./utils');
const SEP = '\/';
const MAX_KEYS = 5
const getObjects = async (sourceBucket, maxKeys) => {
console.info('-- getObjects --');
const params = {
Bucket: sourceBucket
};
if (isNumber(maxKeys) && Number(maxKeys) > 0) {
params.MaxKeys = `${maxKeys}`
}
try {
const items = await s3.listObjects(params).promise();
if (isError(items)) {
console.info('-- getObjects error --');
}
return items;
} catch (ex) {
console.info('-- getObjects failure --');
console.info(JSON.stringify(ex, null, 2));
return ex;
}
}
const getObject = async (bucketName, key) => {
console.info('-- getObject --')
console.info(`BUCKET: ${bucketName}`)
console.info(`KEY: ${key}`)
const params = {
Bucket: bucketName,
Key: key
}
try {
const item = await s3.getObject(params).promise();
if (isError(item)) {
console.info('-- getObject error --');
}
return item;
} catch (ex) {
console.info('-- getObject failure --');
console.info(JSON.stringify(ex, null, 2));
return ex;
}
}
const objectExists = async (bucketName, key) => {
console.info('-- objectExists --')
const item = await getObject(bucketName, key);
if (isError(item)) {
console.info('-- objectExists : ERROR --')
return item;
}
if (item && item.ETag) {
console.info('-- objectExists : TRUE --')
console.log(`Etag: ${item.ETag}`);
return true;
}
console.info('-- objectExists : FALSE --');
return false;
}
const copyItem = async (item, sourceBucket, targetBucket) => {
console.info('-- copyItem --');
const date = new Date(Date.parse(item.LastModified));
const domain = item.Key.split(SEP)[0];
const id = item.Key.split(SEP)[1];
const datePath = toBlockDate(date, SEP, false);
const targetKey = [].concat(domain, datePath, id).join(SEP);
const exists = await objectExists(targetBucket, targetKey);
if (exists === true) {
console.info('Object exists in target bucket.');
console.info(`BUCKET: ${targetBucket}`);
console.info(`KEY: ${targetKey}`);
return false;
}
const params = {
Bucket: targetBucket,
CopySource: `${sourceBucket}/${item.Key}`,
Key: targetKey,
Metadata: {
domain,
id: id
}
}
try {
const result = await s3.copyObject(params).promise();
if (result && result.CopyObjectResult && result.CopyObjectResult.ETag) {
return true;
}
console.info('-- copyItem error --');
return false;
} catch (ex) {
console.info('-- copyItem failure --');
console.info(JSON.stringify(ex, null, 2));
return ex;
}
}
exports.handler = async (event, context, cb) => {
let fetchResult = await getObjects(process.env.SOURCE_BUCKET, process.env.QUANTITY);
if (!fetchResult) {
return cb(new Error('No fetch result.'));
}
if (fetchResult instanceof Error) {
return cb(fetchResult);
}
if (!isObject(fetchResult)) {
return cb(new Error('Fetch returned unexpected results.'));
}
if (!Array.isArray(fetchResult.Contents)) {
return cb(new Error('No Contents returned.'));
}
const items = fetchResult.Contents.filter(x => (x &&
x.LastModified &&
x.Key && x.Key.includes(SEP) &&
x.Key.split(SEP).length === 2 &&
x.LastModified != null &&
x.Key.split('/')[1] !== x.Key.split('/')[1].toUpperCase()));
console.info(`Qualified Items: ${items.length}`)
for (let i = 0; i < items.length; i += 1) {
console.info(`item ${(i + 1)} of ${items.length}`);
const copyResult = await copyItem(items[i], process.env.SOURCE_BUCKET, process.env.TARGET_BUCKET);
if (copyResult === true) {
continue;
}
if (copyResult === false) {
console.log(`FAILURE ON #${i + 1}`);
continue;
}
return cb(new Error('Failure!'));
}
};