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/** | |
* Returns a `Buffer` instance from the given data URI `uri`. | |
* | |
* @param {String} uri Data URI to turn into a Buffer instance | |
* @returns {Buffer} Buffer instance from Data URI | |
* @api public | |
*/ | |
export function dataUriToBuffer(uri) { | |
if (!/^data:/i.test(uri)) { | |
throw new TypeError('`uri` does not appear to be a Data URI (must begin with "data:")'); | |
} | |
// strip newlines | |
uri = uri.replace(/\r?\n/g, ''); | |
// split the URI up into the "metadata" and the "data" portions | |
const firstComma = uri.indexOf(','); | |
if (firstComma === -1 || firstComma <= 4) { | |
throw new TypeError('malformed data: URI'); | |
} | |
// remove the "data:" scheme and parse the metadata | |
const meta = uri.substring(5, firstComma).split(';'); | |
let charset = ''; | |
let base64 = false; | |
const type = meta[0] || 'text/plain'; | |
let typeFull = type; | |
for (let i = 1; i < meta.length; i++) { | |
if (meta[i] === 'base64') { | |
base64 = true; | |
} | |
else if (meta[i]) { | |
typeFull += `;${meta[i]}`; | |
if (meta[i].indexOf('charset=') === 0) { | |
charset = meta[i].substring(8); | |
} | |
} | |
} | |
// defaults to US-ASCII only if type is not provided | |
if (!meta[0] && !charset.length) { | |
typeFull += ';charset=US-ASCII'; | |
charset = 'US-ASCII'; | |
} | |
// get the encoded data portion and decode URI-encoded chars | |
const encoding = base64 ? 'base64' : 'ascii'; | |
const data = unescape(uri.substring(firstComma + 1)); | |
const buffer = Buffer.from(data, encoding); | |
// set `.type` and `.typeFull` properties to MIME type | |
buffer.type = type; | |
buffer.typeFull = typeFull; | |
// set the `.charset` property | |
buffer.charset = charset; | |
return buffer; | |
} | |
export default dataUriToBuffer; | |
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