You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
3.4 KiB
127 lines
3.4 KiB
import {Singleton, Inject} from "@extollo/di"
|
|
import {Unit, Logging} from "@extollo/lib"
|
|
import {FirebaseUnit} from "./FirebaseUnit"
|
|
import {BlockResource, BlockResourceItem, BlockTransaction} from "../rtdb/BlockResource"
|
|
import {TransactionResourceItem} from "../rtdb/TransactionResource"
|
|
import * as crypto from "crypto"
|
|
import {collect} from "@extollo/util";
|
|
|
|
export class Block implements BlockResourceItem {
|
|
firebaseID: string;
|
|
seqID: number;
|
|
uuid: string;
|
|
combinedHash: string;
|
|
timestamp: number;
|
|
encodedGPSLocation: string;
|
|
transactions: BlockTransaction[];
|
|
lastBlockHash: string;
|
|
lastBlockUUID: string;
|
|
|
|
constructor(rec: BlockResourceItem) {
|
|
this.firebaseID = rec.firebaseID;
|
|
this.seqID = rec.seqID
|
|
this.uuid = rec.uuid
|
|
this.combinedHash = rec.combinedHash
|
|
this.timestamp = rec.timestamp
|
|
this.encodedGPSLocation = rec.encodedGPSLocation
|
|
this.transactions = rec.transactions
|
|
this.lastBlockHash = rec.lastBlockHash
|
|
this.lastBlockUUID = rec.lastBlockUUID
|
|
}
|
|
|
|
hash() {
|
|
return crypto.createHash('sha256')
|
|
.update(this.toString(), 'utf-8')
|
|
.digest('hex')
|
|
}
|
|
|
|
toString() {
|
|
return [
|
|
this.uuid,
|
|
this.combinedHash,
|
|
this.timestamp.toString(),
|
|
this.encodedGPSLocation,
|
|
JSON.stringify(this.transactions),
|
|
this.lastBlockHash,
|
|
this.lastBlockUUID,
|
|
].join('%')
|
|
}
|
|
}
|
|
|
|
export interface Peer {
|
|
host: string,
|
|
name?: string,
|
|
}
|
|
|
|
/**
|
|
* Blockchain Unit
|
|
* ---------------------------------------
|
|
* Main service for interacting with the contact blockchain.
|
|
*/
|
|
@Singleton()
|
|
export class Blockchain extends Unit {
|
|
@Inject()
|
|
protected readonly logging!: Logging
|
|
|
|
@Inject()
|
|
protected readonly firebase!: FirebaseUnit
|
|
|
|
public async hasPeer(host: string): Promise<boolean> {
|
|
const peers = await this.getPeers()
|
|
return peers.some(peer => peer.host.toLowerCase() === host.toLowerCase())
|
|
}
|
|
|
|
public async getPeers(): Promise<Peer[]> {
|
|
const data = await this.firebase.ref('peers').once('value')
|
|
return (data.val() as Peer[]) || []
|
|
}
|
|
|
|
public async registerPeer(peer: Peer) {
|
|
if ( !(await this.hasPeer(peer.host)) ) {
|
|
await this.firebase.ref('peers').push().set(peer)
|
|
}
|
|
}
|
|
|
|
public async validate(chain: Block[]) {
|
|
const blocks = collect<Block>(chain)
|
|
return blocks.every((block: Block, idx: number) => {
|
|
if ( idx === 0 ) return true; // TODO handle genesis
|
|
|
|
return block.lastBlockHash === blocks.at(idx)!.hash()
|
|
})
|
|
}
|
|
|
|
public async refresh() {
|
|
|
|
}
|
|
|
|
public async submitBlock(afterBlock: Block, proofToken: string) {
|
|
|
|
}
|
|
|
|
public async submitTransactions(group: [TransactionResourceItem, TransactionResourceItem]) {
|
|
// Not sure yet
|
|
}
|
|
|
|
public async getLastBlock(): Promise<Block | undefined> {
|
|
const rec: BlockResourceItem | undefined = await BlockResource.collect().last()
|
|
return rec ? new Block(rec) : undefined
|
|
}
|
|
|
|
public async up() {
|
|
|
|
}
|
|
|
|
public async down() {
|
|
|
|
}
|
|
|
|
protected async generateProofOfWork(lastBlock: Block): Promise<string> {
|
|
const hash = lastBlock.hash()
|
|
|
|
// Create a signature from the hash using the server's private key
|
|
|
|
return hash
|
|
}
|
|
}
|