@uppy/utils/lib/dataURItoBlob.js

Shared utility functions for Uppy Core and plugins maintained by the Uppy team.

const DATA_URL_PATTERN = /^data:([^/]+\/[^,;]+(?:[^,]*?))(;base64)?,([\s\S]*)$/;
function dataURItoBlob(dataURI, opts, toFile) {
    // get the base64 data
    const dataURIData = DATA_URL_PATTERN.exec(dataURI);
    // user may provide mime type, if not get it from data URI
    const mimeType = opts.mimeType ?? dataURIData?.[1] ?? 'plain/text';
    let data; // We add `!` to tell TS we're OK with `data` being not defined when the dataURI is invalid.
    if (dataURIData?.[2] != null) {
        const binary = atob(decodeURIComponent(dataURIData[3]));
        const bytes = new Uint8Array(binary.length);
        for (let i = 0; i < binary.length; i++) {
            bytes[i] = binary.charCodeAt(i);
        }
        data = [bytes];
    }
    else if (dataURIData?.[3] != null) {
        data = [decodeURIComponent(dataURIData[3])];
    }
    // Convert to a File?
    if (toFile) {
        return new File(data, opts.name || '', { type: mimeType });
    }
    return new Blob(data, { type: mimeType });
}
export default dataURItoBlob;