/* From https://github.com/DiegoZoracKy/image-data-uri/blob/master/lib/image-data-uri.js Modified with 0 dependencies */ let fs = require("fs"); const { log } = require("../src/util"); let ImageDataURI = (() => { /** * Decode the data:image/ URI * @param {string} dataURI data:image/ URI to decode * @returns {?Object} An object with properties "imageType" and "dataBase64". * The former is the image type, e.g., "png", and the latter is a base64 * encoded string of the image's binary data. If it fails to parse, returns * null instead of an object. */ function decode(dataURI) { if (!/data:image\//.test(dataURI)) { log.error("image-data-uri", "It seems that it is not an Image Data URI. Couldn't match \"data:image/\""); return null; } let regExMatches = dataURI.match("data:(image/.*);base64,(.*)"); return { imageType: regExMatches[1], dataBase64: regExMatches[2], dataBuffer: new Buffer(regExMatches[2], "base64") }; } /** * Endcode an image into data:image/ URI * @param {(Buffer|string)} data Data to encode * @param {string} mediaType Media type of data * @returns {(string|null)} A string representing the base64-encoded * version of the given Buffer object or null if an error occurred. */ function encode(data, mediaType) { if (!data || !mediaType) { log.error("image-data-uri", "Missing some of the required params: data, mediaType"); return null; } mediaType = (/\//.test(mediaType)) ? mediaType : "image/" + mediaType; let dataBase64 = (Buffer.isBuffer(data)) ? data.toString("base64") : new Buffer(data).toString("base64"); let dataImgBase64 = "data:" + mediaType + ";base64," + dataBase64; return dataImgBase64; } /** * Write data URI to file * @param {string} dataURI data:image/ URI * @param {string} [filePath] Path to write file to * @returns {Promise<string>} */ function outputFile(dataURI, filePath) { filePath = filePath || "./"; return new Promise((resolve, reject) => { let imageDecoded = decode(dataURI); fs.writeFile(filePath, imageDecoded.dataBuffer, err => { if (err) { return reject("ImageDataURI :: Error :: " + JSON.stringify(err, null, 4)); } resolve(filePath); }); }); } return { decode: decode, encode: encode, outputFile: outputFile, }; })(); module.exports = ImageDataURI;