From 91f4681a3cd2d8b9ac41ed18644e6a6625e18f2c Mon Sep 17 00:00:00 2001 From: j433866 Date: Tue, 19 Feb 2019 15:37:49 +0000 Subject: [PATCH] Add rotate image operation --- src/core/operations/RotateImage.mjs | 96 +++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 src/core/operations/RotateImage.mjs diff --git a/src/core/operations/RotateImage.mjs b/src/core/operations/RotateImage.mjs new file mode 100644 index 00000000..1060aeb8 --- /dev/null +++ b/src/core/operations/RotateImage.mjs @@ -0,0 +1,96 @@ +/** + * @author j433866 [j433866@gmail.com] + * @copyright Crown Copyright 2018 + * @license Apache-2.0 + */ + +import Operation from "../Operation"; +import OperationError from "../errors/OperationError"; +import Magic from "../lib/Magic"; +import { toBase64 } from "../lib/Base64"; +import jimp from "jimp"; + +/** + * Rotate Image operation + */ +class RotateImage extends Operation { + + /** + * RotateImage constructor + */ + constructor() { + super(); + + this.name = "Rotate Image"; + this.module = "Image"; + this.description = "Rotates an image by the specified number of degrees."; + this.infoURL = ""; + this.inputType = "byteArray"; + this.outputType = "byteArray"; + this.presentType = "html"; + this.args = [ + { + "name": "Rotation amount (degrees)", + "type": "number", + "value": 90 + } + ]; + } + + /** + * @param {byteArray} input + * @param {Object[]} args + * @returns {byteArray} + */ + run(input, args) { + const [degrees] = args; + const type = Magic.magicFileType(input); + + if (type && type.mime.indexOf("image") === 0){ + return new Promise((resolve, reject) => { + jimp.read(Buffer.from(input)) + .then(image => { + image + .rotate(degrees / 100) + .getBuffer(jimp.AUTO, (error, result) => { + if (error){ + reject(new OperationError("Error getting the new image buffer")); + } else { + resolve([...result]); + } + }); + }) + .catch(err => { + reject(new OperationError("Error reading the input image.")); + }); + }); + } else { + throw new OperationError("Invalid file type."); + } + } + + /** + * Displays the rotated image using HTML for web apps + * + * @param {byteArray} data + * @returns {html} + */ + present(data) { + if (!data.length) return ""; + + let dataURI = "data:"; + const type = Magic.magicFileType(data); + if (type && type.mime.indexOf("image") === 0){ + dataURI += type.mime + ";"; + } else { + throw new OperationError("Invalid file type."); + } + dataURI += "base64," + toBase64(data); + + return ""; + + } + +} + +export default RotateImage;