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import { BSONError } from '../error';
type TextDecoder = {
readonly encoding: string;
readonly fatal: boolean;
readonly ignoreBOM: boolean;
decode(input?: Uint8Array): string;
};
type TextDecoderConstructor = {
new (label: 'utf8', options: { fatal: boolean; ignoreBOM?: boolean }): TextDecoder;
};
type TextEncoder = {
readonly encoding: string;
encode(input?: string): Uint8Array;
};
type TextEncoderConstructor = {
new (): TextEncoder;
};
// Web global
declare const TextDecoder: TextDecoderConstructor;
declare const TextEncoder: TextEncoderConstructor;
declare const atob: (base64: string) => string;
declare const btoa: (binary: string) => string;
type ArrayBufferViewWithTag = ArrayBufferView & {
[Symbol.toStringTag]?: string;
};
function isReactNative() {
const { navigator } = globalThis as { navigator?: { product?: string } };
return typeof navigator === 'object' && navigator.product === 'ReactNative';
}
/** @internal */
export function webMathRandomBytes(byteLength: number) {
if (byteLength < 0) {
throw new RangeError(`The argument 'byteLength' is invalid. Received ${byteLength}`);
}
return webByteUtils.fromNumberArray(
Array.from({ length: byteLength }, () => Math.floor(Math.random() * 256))
);
}
/** @internal */
const webRandomBytes: (byteLength: number) => Uint8Array = (() => {
const { crypto } = globalThis as {
crypto?: { getRandomValues?: (space: Uint8Array) => Uint8Array };
};
if (crypto != null && typeof crypto.getRandomValues === 'function') {
return (byteLength: number) => {
// @ts-expect-error: crypto.getRandomValues cannot actually be null here
// You cannot separate getRandomValues from crypto (need to have this === crypto)
return crypto.getRandomValues(webByteUtils.allocate(byteLength));
};
} else {
if (isReactNative()) {
const { console } = globalThis as { console?: { warn?: (message: string) => void } };
console?.warn?.(
'BSON: For React Native please polyfill crypto.getRandomValues, e.g. using: https://www.npmjs.com/package/react-native-get-random-values.'
);
}
return webMathRandomBytes;
}
})();
const HEX_DIGIT = /(\d|[a-f])/i;
/** @internal */
export const webByteUtils = {
toLocalBufferType(
potentialUint8array: Uint8Array | ArrayBufferViewWithTag | ArrayBuffer
): Uint8Array {
const stringTag =
potentialUint8array?.[Symbol.toStringTag] ??
Object.prototype.toString.call(potentialUint8array);
if (stringTag === 'Uint8Array') {
return potentialUint8array as Uint8Array;
}
if (ArrayBuffer.isView(potentialUint8array)) {
return new Uint8Array(
potentialUint8array.buffer.slice(
potentialUint8array.byteOffset,
potentialUint8array.byteOffset + potentialUint8array.byteLength
)
);
}
if (
stringTag === 'ArrayBuffer' ||
stringTag === 'SharedArrayBuffer' ||
stringTag === '[object ArrayBuffer]' ||
stringTag === '[object SharedArrayBuffer]'
) {
return new Uint8Array(potentialUint8array);
}
throw new BSONError(`Cannot make a Uint8Array from ${String(potentialUint8array)}`);
},
allocate(size: number): Uint8Array {
if (typeof size !== 'number') {
throw new TypeError(`The "size" argument must be of type number. Received ${String(size)}`);
}
return new Uint8Array(size);
},
equals(a: Uint8Array, b: Uint8Array): boolean {
if (a.byteLength !== b.byteLength) {
return false;
}
for (let i = 0; i < a.byteLength; i++) {
if (a[i] !== b[i]) {
return false;
}
}
return true;
},
fromNumberArray(array: number[]): Uint8Array {
return Uint8Array.from(array);
},
fromBase64(base64: string): Uint8Array {
return Uint8Array.from(atob(base64), c => c.charCodeAt(0));
},
toBase64(uint8array: Uint8Array): string {
return btoa(webByteUtils.toISO88591(uint8array));
},
/** **Legacy** binary strings are an outdated method of data transfer. Do not add public API support for interpreting this format */
fromISO88591(codePoints: string): Uint8Array {
return Uint8Array.from(codePoints, c => c.charCodeAt(0) & 0xff);
},
/** **Legacy** binary strings are an outdated method of data transfer. Do not add public API support for interpreting this format */
toISO88591(uint8array: Uint8Array): string {
return Array.from(Uint16Array.from(uint8array), b => String.fromCharCode(b)).join('');
},
fromHex(hex: string): Uint8Array {
const evenLengthHex = hex.length % 2 === 0 ? hex : hex.slice(0, hex.length - 1);
const buffer = [];
for (let i = 0; i < evenLengthHex.length; i += 2) {
const firstDigit = evenLengthHex[i];
const secondDigit = evenLengthHex[i + 1];
if (!HEX_DIGIT.test(firstDigit)) {
break;
}
if (!HEX_DIGIT.test(secondDigit)) {
break;
}
const hexDigit = Number.parseInt(`${firstDigit}${secondDigit}`, 16);
buffer.push(hexDigit);
}
return Uint8Array.from(buffer);
},
toHex(uint8array: Uint8Array): string {
return Array.from(uint8array, byte => byte.toString(16).padStart(2, '0')).join('');
},
fromUTF8(text: string): Uint8Array {
return new TextEncoder().encode(text);
},
toUTF8(uint8array: Uint8Array, start: number, end: number): string {
return new TextDecoder('utf8', { fatal: false }).decode(uint8array.slice(start, end));
},
utf8ByteLength(input: string): number {
return webByteUtils.fromUTF8(input).byteLength;
},
encodeUTF8Into(buffer: Uint8Array, source: string, byteOffset: number): number {
const bytes = webByteUtils.fromUTF8(source);
buffer.set(bytes, byteOffset);
return bytes.byteLength;
},
randomBytes: webRandomBytes
};
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