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index.js
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index.js
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const _ = require('lodash');
const md5 = require('md5');
const got = require('got');
module.exports = class S3Proxy {
constructor(s3, bucket, parsers = {}) {
if(!s3) {
throw new Error('missing s3 instance.');
}
if(!bucket) {
throw new Error('missing bucket instance.');
}
this.s3 = s3;
this.got = got;
this.bucket = bucket;
this.parsers = parsers;
this.parseResponse = this.parseResponse.bind(this);
}
get(args = {}) {
const {
folder = null,
id = null,
parser = null,
src
} = args;
if(!src) {
return Promise.reject(new Error('src missing.'));
}
let parserFn = this.parsers[parser] || _.identity;
let key = id || md5(parser + src);
if (folder) {
key = `${folder}/${key}`;
}
return this.s3.getObject({
Bucket: this.bucket,
Key: key
})
.promise()
.then(({
Body,
ContentType
}) => ({
body: Body,
contentType: ContentType
}))
.catch(err => {
return this.got(src, {
encoding: null
})
.then(({
body,
headers
}) => {
let contentType = headers['content-type'];
let isJson = contentType === 'application/json';
body = parserFn(body.toString(), contentType);
if (_.isObject(body) && !_.isBuffer(body) && !isJson) {
body = JSON.stringify(body);
contentType = 'application/json';
}
if (_.isString(body)) {
body = Buffer.from(body);
}
return {
body,
contentType
};
})
.then(({
body,
contentType
}) => {
return this.s3.putObject({
Bucket: this.bucket,
Key: key,
Body: body,
ContentType: contentType
})
.promise()
.then(() => ({
body,
contentType
}))
.catch(() => ({
body,
contentType
}));
});
})
.then(this.parseResponse);
}
parseResponse(response) {
let {
body,
contentType
} = response;
if(contentType === 'application/json') {
try {
body = JSON.parse(body.toString());
} catch(err) {
body = body.toString();
contentType = 'text/plain';
}
} else {
body = body.toString();
}
return {
body,
contentType
};
}
};