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이미지 리사이징 람다 함수
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| 'use strict'; | |
| const querystring = require('querystring'); // Don't install. | |
| const axios = require('axios'); | |
| // http://sharp.pixelplumbing.com/en/stable/api-resize/ | |
| const Sharp = require('sharp'); | |
| // Image types that can be handled by Sharp | |
| const supportImageTypes = ['jpg', 'jpeg', 'png', 'gif', 'webp', 'svg', 'tiff']; | |
| exports.handler = async(event, context, callback) => { | |
| const { request, response } = event.Records[0].cf; | |
| // console.log('request:', request); | |
| // console.log('response:', response); | |
| // Parameters are w, h, f, q and indicate width, height, format and quality. | |
| const { uri } = request; | |
| const ObjectKey = decodeURIComponent(uri).substring(1); | |
| const params = querystring.parse(request.querystring); | |
| const { w, h, q, f } = params | |
| /** | |
| * ex) https://dilgv5hokpawv.cloudfront.net/dev/item.ssgcdn.com/53/02/00/item/0000000000253_i1_350.jpg?w=200&h=150&f=webp&q=90 | |
| * - ObjectKey: 'dev/item.ssgcdn.com/53/02/00/item/0000000000253_i1_350.jpg' | |
| * - w: '200' | |
| * - h: '150' | |
| * - f: 'webp' | |
| * - q: '90' | |
| */ | |
| // console.log('Object key:', ObjectKey); | |
| const extension = uri.match(/\/?(.*)\.(.*)/)[2].toLowerCase(); | |
| const width = parseInt(w, 10) || null; | |
| const height = parseInt(h, 10) || null; | |
| const quality = parseInt(q, 10) || 100; // Sharp는 이미지 포맷에 따라서 품질(quality)의 기본값이 다릅니다. | |
| let format = (f || extension).toLowerCase(); // 요청포맷이 없을 경우 원본 포맷을 유지한다. | |
| let resizedImage; | |
| // 포맷 변환이 없는 GIF 포맷 요청은 원본 반환. | |
| if (extension === 'gif' && !f) { | |
| return callback(null, response); | |
| } | |
| // Init format. | |
| format = format === 'jpg' ? 'jpeg' : format; | |
| if (!supportImageTypes.some(type => type === extension )) { | |
| responseHandler( | |
| 403, | |
| 'Forbidden', | |
| 'Unsupported image type', [{ | |
| key: 'Content-Type', | |
| value: 'text/plain' | |
| }], | |
| ); | |
| return callback(null, response); | |
| } | |
| // Verify For AWS CloudWatch. | |
| // console.log(`parmas: ${JSON.stringify(params)}`); // Cannot convert object to primitive value. | |
| const originImageBuffer = (await axios({ url: "http://" + ObjectKey, responseType: "arraybuffer" })).data; | |
| // 크기 조절이 없는 경우 원본 반환. | |
| if (!(w || h)) { | |
| responseHandler( | |
| 200, | |
| 'OK', | |
| originImageBuffer.toString('base64'), [{ | |
| key: 'Content-Type', | |
| value: `image/${format}` | |
| }], | |
| 'base64' | |
| ); | |
| return callback(null, response); | |
| } | |
| try { | |
| resizedImage = await Sharp(originImageBuffer) | |
| .resize(width, height, { | |
| kernel: Sharp.kernel.nearest, | |
| fit: 'contain', | |
| position: 'centre', | |
| background: { r: 255, g: 255, b: 255, alpha: 1 } | |
| }) | |
| .toFormat(format, { | |
| quality | |
| }) | |
| .toBuffer(); | |
| } | |
| catch (error) { | |
| responseHandler( | |
| 500, | |
| 'Internal Server Error', | |
| 'Fail to resize image.', [{ | |
| key: 'Content-Type', | |
| value: 'text/plain' | |
| }], | |
| ); | |
| return callback(null, response); | |
| } | |
| // 응답 이미지 용량이 1MB 이상일 경우 원본 반환. | |
| if (Buffer.byteLength(resizedImage, 'base64') >= 1048576) { | |
| return callback(null, response); | |
| } | |
| responseHandler( | |
| 200, | |
| 'OK', | |
| resizedImage.toString('base64'), [{ | |
| key: 'Content-Type', | |
| value: `image/${format}` | |
| }], | |
| 'base64' | |
| ); | |
| /** | |
| * @summary response 객체 수정을 위한 wrapping 함수 | |
| */ | |
| function responseHandler(status, statusDescription, body, contentHeader, bodyEncoding) { | |
| response.status = status; | |
| response.statusDescription = statusDescription; | |
| response.body = body; | |
| response.headers['content-type'] = contentHeader; | |
| if (bodyEncoding) { | |
| response.bodyEncoding = bodyEncoding; | |
| } | |
| } | |
| // console.log('Success resizing image'); | |
| return callback(null, response); | |
| }; |
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s3 파일을 리자이징 하는 방식에서 원격지 파일을 다운받아 리자이즈 되도록 기능 개선