Base-64 Plugin is not browser native/compatible without build step about generic-oauth2 HOT 6 CLOSED

let lookup = [];
let revLookup = [];
let Arr = typeof Uint8Array !== "undefined" ? Uint8Array : Array;

let code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
for (let i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i];
    revLookup[code.charCodeAt(i)] = i;
}

// Support decoding URL-safe base64 strings, as Node.js does.
// See: https://en.wikipedia.org/wiki/Base64#URL_applications
revLookup["-".charCodeAt(0)] = 62;
revLookup["_".charCodeAt(0)] = 63;

export const getLens = b64 => {
    let len = b64.length;

    if (len % 4 > 0) {
        throw new Error("Invalid string. Length must be a multiple of 4");
    }

    // Trim off extra bytes after placeholder bytes are found
    // See: https://github.com/beatgammit/base64-js/issues/42
    let validLen = b64.indexOf("=");
    if (validLen === -1) validLen = len;

    let placeHoldersLen = validLen === len ? 0 : 4 - (validLen % 4);

    return [validLen, placeHoldersLen];
};

// base64 is 4/3 + up to two characters of the original data
export const byteLength = b64 => {
    let lens = getLens(b64);
    let validLen = lens[0];
    let placeHoldersLen = lens[1];
    return ((validLen + placeHoldersLen) * 3) / 4 - placeHoldersLen;
};

const _byteLength = (b64, validLen, placeHoldersLen) => {
    return ((validLen + placeHoldersLen) * 3) / 4 - placeHoldersLen;
};

export const toByteArray = b64 => {
    let tmp;
    let lens = getLens(b64);
    let validLen = lens[0];
    let placeHoldersLen = lens[1];

    let arr = new Arr(_byteLength(b64, validLen, placeHoldersLen));

    let curByte = 0;

    // if there are placeholders, only get up to the last complete 4 chars
    let len = placeHoldersLen > 0 ? validLen - 4 : validLen;

    for (let i = 0; i < len; i += 4) {
        tmp =
            (revLookup[b64.charCodeAt(i)] << 18) |
            (revLookup[b64.charCodeAt(i + 1)] << 12) |
            (revLookup[b64.charCodeAt(i + 2)] << 6) |
            revLookup[b64.charCodeAt(i + 3)];
        arr[curByte++] = (tmp >> 16) & 0xff;
        arr[curByte++] = (tmp >> 8) & 0xff;
        arr[curByte++] = tmp & 0xff;
    }

    if (placeHoldersLen === 2) {
        tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4);
        arr[curByte++] = tmp & 0xff;
    }

    if (placeHoldersLen === 1) {
        tmp =
            (revLookup[b64.charCodeAt(i)] << 10) |
            (revLookup[b64.charCodeAt(i + 1)] << 4) |
            (revLookup[b64.charCodeAt(i + 2)] >> 2);
        arr[curByte++] = (tmp >> 8) & 0xff;
        arr[curByte++] = tmp & 0xff;
    }

    return arr;
};

export const tripletToBase64 = num => {
    return lookup[(num >> 18) & 0x3f] + lookup[(num >> 12) & 0x3f] + lookup[(num >> 6) & 0x3f] + lookup[num & 0x3f];
};

export const encodeChunk = (uint8, start, end) => {
    let tmp;
    let output = [];
    for (let i = start; i < end; i += 3) {
        tmp = ((uint8[i] << 16) & 0xff0000) + ((uint8[i + 1] << 8) & 0xff00) + (uint8[i + 2] & 0xff);
        output.push(tripletToBase64(tmp));
    }
    return output.join("");
};

export const fromByteArray = uint8 => {
    let tmp;
    let len = uint8.length;
    let extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
    let parts = [];
    let maxChunkLength = 16383; // must be multiple of 3

    // go through the array every three bytes, we'll deal with trailing stuff later
    for (let i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
        parts.push(encodeChunk(uint8, i, i + maxChunkLength > len2 ? len2 : i + maxChunkLength));
    }

    // pad the end with zeros, but make sure to not forget the extra bytes
    if (extraBytes === 1) {
        tmp = uint8[len - 1];
        parts.push(lookup[tmp >> 2] + lookup[(tmp << 4) & 0x3f] + "==");
    } else if (extraBytes === 2) {
        tmp = (uint8[len - 2] << 8) + uint8[len - 1];
        parts.push(lookup[tmp >> 10] + lookup[(tmp >> 4) & 0x3f] + lookup[(tmp << 2) & 0x3f] + "=");
    }

    return parts.join("");
};

import {fromByteArray} from "../Base64-esm";

const encoded = fromByteArray(new Uint8Array(buffer));