some kind of blockchain is been created
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asdasd.js
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"use strict";
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// Initializin of the variable for instance of asdasd
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let blockchain;
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function init_asdasd(asdasd) {
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if (indexedDB instanceof IDBFactory) {
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// Supports indexedDB
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// Initializing of asdasd
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blockchain = new asdasd(
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"test",
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(text, settings, previous, created) => {
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let hash = "";
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let nonce = 0;
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do {
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hash = nobleHashes.utils.bytesToHex(nobleHashes.blake3(
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previous + text + created + ++nonce,
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settings,
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));
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} while (hash.substring(0, 3) !== "000");
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return { nonce, hash };
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},
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);
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} else {
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// Not supports indexed
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// Show the error
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document.getElementsByTagName("main")[0].innerText =
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"Your browser does not support indexedDB which is used for asdasd blockchain";
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}
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}
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if (typeof window.asdasd === "function") (() => init_asdasd(asdasd))();
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else {document.addEventListener("asdasd.initialized", (e) =>
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init_asdasd(e.asdasd));}
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Example</title>
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</head>
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<body>
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<p>see "example.js"</p>
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<script src="noble-hashes.js" defer></script>
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<script src="asdasd.js" defer></script>
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<script src="example.js" defer></script>
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</body>
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</html>
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noble-hashes.js
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"use strict";
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if (typeof window.asdasd !== "function") {
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// Not initialized
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// Initializing of the class in global namespace
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window.asdasd = class asdasd {
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// Name of the database in IndexDB
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name;
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// Instance of the database session
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db;
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/**
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* Function for generating hash (BLAKE3)
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*
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* @param {string} text Text of message
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* @param {object} settings Settings for generating hash
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* @param {string} previous Hash of the previout message in the chain
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* @param {string} created Date of message creation (unixtime)
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*
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* @return {string} Symmetric hash
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*/
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static blake3;
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constructor(name, blake3) {
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// Reinitializing Blake3
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if (typeof blake3 === "function") this.blake3 = blake3;
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if (typeof name === "string" && typeof this.blake3 === "function") {
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// Received name of the the database and implementation of BLAKE3
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// Write name of the the database to property
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this.name = name;
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// Send request to the database
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const request = indexedDB.open(this.name, 1);
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// Listening: "upgradeneeded"
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request.addEventListener("upgradeneeded", (e) => {
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// Write response to property
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this.db = e.target.result;
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// Initializing of instance of messages table in the database
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const messages = this.db.createObjectStore("messages", {
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keyPath: "id",
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});
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// Index: text
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messages.createIndex("text", "text", { unique: false });
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// Index: date of creation
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messages.createIndex("created", "created", { unique: false });
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// Index: hash
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messages.createIndex("hash", "hash", { unique: true });
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// Dispatch event: "initialized"
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document.dispatchEvent(
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new CustomEvent(`asdasd.${this.name}.initialized`),
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);
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});
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// Listening: "error"
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request.addEventListener(
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"error",
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(e) => alert("the database: " + e.target.error),
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);
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// Listening: "success"
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request.addEventListener("success", (e) => this.db = e.target.result);
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this.pending = [];
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}
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}
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/**
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* Count the number of messages in the database
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*/
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count() {
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return new Promise((resolve, reject) => {
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// Initializing of transaction to the database
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const transaction = this.db.transaction(["messages"]);
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// Initializing of table in the database
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const messages = transaction.objectStore("messages");
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// Send request to the database
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const request = messages.count();
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// Listening: "error"
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request.addEventListener("error", (e) => reject(e));
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// Listening: "success"
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request.addEventListener("success", (e) => resolve(e.target.result));
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});
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}
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write(message) {
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return new Promise((resolve, reject) => {
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this.count().then(
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(amount) => {
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this.last().then(
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(last) => {
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// Initializing of transaction to the database
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const transaction = this.db.transaction(
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["messages"],
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"readwrite",
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);
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// Initializing of table in the database
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const messages = transaction.objectStore("messages");
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// Initializing of the previous message in the chain hash
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const previous = last.hash ?? "popa";
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// Initializing of message creating date
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const created = Date.now();
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// Generate a hash of the message
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const generated = this.blake3(
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message,
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{
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dkLen: Math.ceil(message.length / 64) * 64,
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},
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previous,
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created,
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);
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// Packing the block and send request to the database
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const request = messages.add({
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id: amount,
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nonce: generated.nonce,
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hash: generated.hash,
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previous,
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created,
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});
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// Listening: "error"
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request.addEventListener("error", (e) => reject(e));
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// Listening: "success"
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request.addEventListener(
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"success",
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(e) => resolve(e.target.result),
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);
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},
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(last) => reject(last),
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);
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},
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(amount) => reject(amount),
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);
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});
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}
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/**
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* Read the message from the database
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*/
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read(id) {
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return new Promise((resolve, reject) => {
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if (typeof id === "number") {
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// Initializing of transaction to the database
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const transaction = this.db.transaction(["messages"]);
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// Initializing of table in the database
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const messages = transaction.objectStore("messages");
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// Send request to the database
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const request = messages.get(id);
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// Listening: "error"
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request.addEventListener("error", (e) => reject(e));
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// Listening: "success"
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request.addEventListener("success", (e) => resolve(e.target.result));
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} else reject("Could not initialize id");
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});
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}
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/**
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* Read the latest message from the database
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*/
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last() {
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return new Promise((resolve, reject) => {
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this.count().then(
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(amount) => {
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if (amount > 0) {
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this.read(amount - 1).then(
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(last) => resolve(last),
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(last) => reject(last),
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);
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} else resolve({});
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},
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(amount) => reject(amount),
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);
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});
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}
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/**
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* Read all messages from the database
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*/
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all() {
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return new Promise((resolve, reject) => {
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// Initializing of transaction to the database
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const transaction = this.db.transaction(["messages"]);
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// Initializing of table in the database
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const messages = transaction.objectStore("messages");
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// Send request to the database
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const request = messages.getAll();
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// Listening: "error"
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request.addEventListener("error", (e) => reject(e));
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// Listening: "success"
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request.addEventListener("success", (e) => resolve(e.target.result));
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});
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}
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};
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// Dispatch event: "initialized"
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document.dispatchEvent(
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new CustomEvent("asdasd.initialized", {
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detail: { asdasd: window.asdasd },
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}),
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);
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}
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// Dispatch event: "loaded"
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document.dispatchEvent(
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new CustomEvent("asdasd.loaded", {
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detail: { asdasd: window.asdasd },
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}),
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);
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