92 lines
2.6 KiB
JavaScript
92 lines
2.6 KiB
JavaScript
import Base64 from './../../utils/Base64';
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export default class Blob {
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_binaryString: string;
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constructor(binaryString: string) {
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this._binaryString = binaryString;
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}
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/**
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* Creates a new Blob from the given Base64 string
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*
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* @url https://firebase.google.com/docs/reference/js/firebase.firestore.Blob#.fromBase64String
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* @param base64 string
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*/
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static fromBase64String(base64: string): Blob {
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if (typeof base64 !== 'string' || base64.length < 1) {
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throw new Error(
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'firestore.Blob.fromBase64String expects a string of at least 1 character in length'
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);
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}
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return new Blob(Base64.atob(base64));
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}
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/**
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* Creates a new Blob from the given Uint8Array.
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*
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* @url https://firebase.google.com/docs/reference/js/firebase.firestore.Blob#.fromUint8Array
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* @param array Array
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*/
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static fromUint8Array(array: Uint8Array): Blob {
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if (!(array instanceof Uint8Array)) {
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throw new Error(
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'firestore.Blob.fromUint8Array expects an instance of Uint8Array'
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);
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}
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return new Blob(
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Array.prototype.map
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.call(array, (char: number) => String.fromCharCode(char))
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.join('')
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);
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}
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/**
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* Returns 'true' if this Blob is equal to the provided one.
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* @url https://firebase.google.com/docs/reference/js/firebase.firestore.Blob#isEqual
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* @param {*} blob Blob The Blob to compare against. Value must not be null.
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* @returns boolean 'true' if this Blob is equal to the provided one.
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*/
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isEqual(blob: Blob): boolean {
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if (!(blob instanceof Blob)) {
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throw new Error('firestore.Blob.isEqual expects an instance of Blob');
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}
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return this._binaryString === blob._binaryString;
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}
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/**
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* Returns the bytes of a Blob as a Base64-encoded string.
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*
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* @url https://firebase.google.com/docs/reference/js/firebase.firestore.Blob#toBase64
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* @returns string The Base64-encoded string created from the Blob object.
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*/
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toBase64(): string {
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return Base64.btoa(this._binaryString);
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}
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/**
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* Returns the bytes of a Blob in a new Uint8Array.
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*
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* @url https://firebase.google.com/docs/reference/js/firebase.firestore.Blob#toUint8Array
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* @returns non-null Uint8Array The Uint8Array created from the Blob object.
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*/
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toUint8Array(): Uint8Array {
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return new Uint8Array(
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this._binaryString.split('').map(c => c.charCodeAt(0))
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);
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}
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/**
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* Returns a string representation of this blob instance
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*
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* @returns {string}
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* @memberof Blob
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*/
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toString(): string {
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return `firestore.Blob(base64: ${this.toBase64()})`;
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}
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}
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