@axway/api-builder-uri-utils/src/iconFileToDataImageURI.js

A collection of URI utility functions for API Builder

const fs = require('fs');

function getDataImageURIType(file) {
	const match = file.match(/\.(?:bmp|jpeg|jpg|png|gif|tiff|tif|svg)$/);
	if (!match) {
		throw new Error(`file must be bmp, jpg, jpeg, png, gif, tiff, or svg: ${file}`);
	}
	let type = match[0].substr(1);
	if (type === 'svg') {
		type = 'svg+xml';
	} else if (type === 'jpg') {
		type = 'jpeg';
	} else if (type === 'tif') {
		type = 'tiff';
	}
	return type;
}

/**
 * Converts an image file to a data-uri.  The file type must be identifiable
 * from its extension, and must be one of: bmp, jpeg, jpg, png, gif, tif,
 * tiff, svg.
 * @param {string} file - The image file to convert to a data-uri.
 * @returns {string} The file encoded as a data-uri.
 * @async
 */
function iconFileToDataImageURI(file) {
	const type = getDataImageURIType(file);
	return new Promise((resolve, reject) => {
		fs.readFile(file, (err, data) => {
			if (err) {
				return reject(err);
			}
			const bdata = data.toString('base64');
			return resolve(`data:image/${type};base64,${bdata}`);
		});
	});
}

/**
 * Converts an image file to a data-uri.  The file type must be identifiable
 * from its extension, and must be one of: bmp, jpeg, jpg, png, gif, tif,
 * tiff, svg.
 * @param {string} file - The image file to convert to a data-uri.
 * @returns {string} The file encoded as a data-uri.
 */
function iconFileToDataImageURISync(file) {
	const type = getDataImageURIType(file);
	const bdata = fs.readFileSync(file).toString('base64');
	return `data:image/${type};base64,${bdata}`;
}

module.exports = {
	iconFileToDataImageURI,
	iconFileToDataImageURISync
};