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feat: util functions to static methods
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,24 +1,41 @@ | ||
| import { calculateBlockHash, createHash } from "./util/crypto"; | ||
| import crypto = require("crypto"); | ||
|
|
||
| export interface BlockParams { | ||
| index: number; | ||
| previousHash: string; | ||
| data: string; | ||
| } | ||
| export class Block<T> { | ||
| public static calculateHash(block: Block<any>): string { | ||
| const json: string = JSON.stringify(block.data); | ||
| const text: string = `${block.index}${block.predecessor}${block.time}${json}`; | ||
| return crypto | ||
| .createHash("sha256") | ||
| .update(text, "utf8") | ||
| .digest("hex"); | ||
| } | ||
|
|
||
| public static validate(block: Block<any>, predecessor: Block<any>): boolean { | ||
| return ( | ||
| predecessor.index + 1 === block.index && | ||
| predecessor.hash === block.predecessor && | ||
| Block.calculateHash(block) === block.hash | ||
| ); | ||
| } | ||
|
|
||
| export class Block { | ||
| public index: number; | ||
| public previousHash: string; | ||
| public timestamp: number; | ||
| public data: string; | ||
| public hash?: string; | ||
| public predecessor: string; | ||
| public time: number; | ||
| public data: T | string; | ||
| public hash: string; | ||
|
|
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| constructor(predecessor: Block<T>, data: T | string) { | ||
| if (predecessor) { | ||
| this.index = predecessor.index + 1; | ||
| this.predecessor = predecessor.hash; | ||
| } else { | ||
| this.index = 0; | ||
| this.predecessor = null; | ||
| } | ||
|
|
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| constructor({ index, previousHash, data }: BlockParams) { | ||
| this.index = index; | ||
| this.previousHash = previousHash; | ||
| this.data = data; | ||
|
|
||
| this.timestamp = Date.now(); | ||
| this.hash = calculateBlockHash(this); | ||
| this.time = Date.now(); | ||
| this.hash = Block.calculateHash(this); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,54 +1,57 @@ | ||
| import { Block, BlockParams } from "./block.model"; | ||
| import { isValidChain } from "./util/blockchain"; | ||
| import { calculateBlockHash } from "./util/crypto"; | ||
| import { Block } from "./block.model"; | ||
|
|
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| const GENESIS_BLOCK_PARAMS: BlockParams = { | ||
| data: "GENESIS", | ||
| index: 0, | ||
| previousHash: null | ||
| }; | ||
| export class Blockchain<T> { | ||
| public static validate(genesis: Block<any>, chain: Block<any>[]): boolean { | ||
| if (Block.calculateHash(genesis) !== chain[0].hash) { | ||
| return false; | ||
| } | ||
|
|
||
| return chain.reduce((valid, block) => { | ||
| if (block.index === 0) { | ||
| return true; | ||
| } | ||
| return Block.validate(block, chain[block.index - 1]) || valid; | ||
| }, true); | ||
| } | ||
|
|
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| export class Blockchain { | ||
| private chain: Block[]; | ||
| private chain: Block<T>[]; | ||
|
|
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| constructor(chain?: Block[]) { | ||
| constructor(chain?: Block<T>[]) { | ||
| if (chain) { | ||
| this.chain = chain; | ||
| } else { | ||
| const genesisBlock: Block = new Block(GENESIS_BLOCK_PARAMS); | ||
| const genesisBlock: Block<T> = new Block<T>(null, "GENESIS"); | ||
| this.chain = [genesisBlock]; | ||
| } | ||
| } | ||
|
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| public getChain(): Block[] { | ||
| public getChain(): Block<T>[] { | ||
| return this.chain; | ||
| } | ||
|
|
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| public getGenesisBlock(): Block { | ||
| public getGenesisBlock(): Block<T> { | ||
| return this.chain[0]; | ||
| } | ||
|
|
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| public getLatestBlock(): Block { | ||
| public getLatestBlock(): Block<T> { | ||
| return this.chain[this.chain.length - 1]; | ||
| } | ||
|
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| public generateNextBlock(data: string): Block { | ||
| const previousBlock: Block = this.getLatestBlock(); | ||
|
|
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| const nextBlock: Block = new Block({ | ||
| data, | ||
| index: previousBlock.index + 1, | ||
| previousHash: previousBlock.hash | ||
| }); | ||
|
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| public add(data: T): Block<T> { | ||
| const predecessor: Block<T> = this.getLatestBlock(); | ||
| const nextBlock: Block<T> = new Block<T>(predecessor, data); | ||
| this.chain.push(nextBlock); | ||
|
|
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| return nextBlock; | ||
| } | ||
|
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| public replaceChain(newBlocks: Block[]): void { | ||
| if (isValidChain(this.getGenesisBlock(), newBlocks) && newBlocks.length > this.chain.length) { | ||
| public replaceChain(newBlocks: Block<T>[]): void { | ||
| const isValid: boolean = Blockchain.validate(this.getGenesisBlock(), newBlocks); | ||
| if (isValid && newBlocks.length > this.chain.length) { | ||
| this.chain = newBlocks; | ||
| } | ||
| } | ||
|
|
||
| public toJSON(): string { | ||
| return JSON.stringify(this.chain, null, 2); | ||
| } | ||
| } |
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