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import MerkleTools from '@settlemint/merkle-tools';
import Axios from 'axios';
import { sha3_512 } from 'js-sha3';
import { Readable } from 'stream';
export enum Protocol {
BITCOIN = 'bitcoin',
ETHEREUM = 'ethereum',
}
export enum NetworkName {
MAINNET = 'mainnet',
TESTNET = 'testnet',
}
export enum DataType {
STRING = 'STRING',
FILE = 'FILE',
HASH = 'HASH',
}
export enum SealStatus {
CONFIRMED = 'confirmed',
FAILED = 'failed',
PENDING = 'pending',
}
export interface ISeal {
id: string;
dataHash: string;
anchors: IAnchors<IAnchor>;
signatures?: ISignatures;
signinvites?: ISignInvites;
sealed: string;
}
export interface IAnchor {
transactionId: string;
nodeUrl: string;
explorer: string;
merkleRoot: string;
proof: IProof[];
exists?: boolean;
}
export interface IInviteAnchor extends IAnchor {
invites?: { [inviteId: string]: ISignInvite };
transactionStatus: SealStatus;
}
export interface ISignInvite {
proof: IProof[];
hash: string;
}
export interface IAnchors<Type> {
ethereum?: {
[networkId: string]: Type;
};
bitcoin?: {
mainnet?: Type;
testnet?: Type;
};
}
export interface IProof {
right?: string;
left?: string;
}
export interface ISignatures {
ethereum?: {
[signerAddress: string]: {
transactionId: string;
nodeUrl: string;
explorer: string;
signature: string;
signed: string;
transactionStatus: SealStatus;
};
};
}
export interface IConfig {
bitcoin?: {
url?: string;
apiKey?: string;
};
ethereum?: {
apiKey?: string;
};
}
export interface ISignInvites {
anchors: IAnchors<IInviteAnchor>;
}
export class CertiMintValidation {
public constructor(protected config: IConfig = {}) {}
public async updateSeal(seal: ISeal): Promise<ISeal> {
seal.signatures = await this.resolveSignatures(seal.signatures);
if (seal.signinvites) {
seal.signinvites = await this.resolveSignInvites(seal.signinvites);
}
return seal;
}
public async validateSealAndData(
seal: ISeal,
data: string,
dataType: DataType
): Promise<SealStatus> {
const hash = await this.hashForData(data, dataType);
const validationStatus = await this.validateSeal(seal);
return hash.toLowerCase() === seal.dataHash.toLowerCase() ? validationStatus : SealStatus.FAILED;
}
public async validateSeal(seal: ISeal): Promise<SealStatus> {
const validAnchors = await this.validateAnchors(
seal.anchors,
seal.dataHash
);
const validSignatures = seal.signatures
? await this.validateSignatures(seal.signatures)
: SealStatus.CONFIRMED;
const validSignInvites = seal.signinvites
? await this.validateSignInvites(seal.signinvites)
: SealStatus.CONFIRMED;
if (
validSignatures === SealStatus.FAILED ||
validSignInvites === SealStatus.FAILED ||
!validAnchors
) {
return SealStatus.FAILED;
}
if (
validSignatures === SealStatus.PENDING ||
validSignInvites === SealStatus.PENDING
) {
return SealStatus.PENDING;
}
return SealStatus.CONFIRMED;
}
private async hashForData(
data: string | Readable | Blob,
dataType: DataType
) {
let hex: string;
switch (dataType) {
case DataType.FILE:
if (data instanceof Readable) {
hex = await this.streamToHashForNode(data);
} else if (data instanceof Blob) {
hex = await this.streamToHashForBrowser(data);
} else {
throw new Error(
`ERROR: File is not Readable or Blob for ${dataType}`
);
}
break;
case DataType.STRING:
if (data instanceof Readable || data instanceof Blob) {
throw new Error(
`ERROR: Data cannot be Readable or Blob for ${dataType}`
);
}
hex = sha3_512(data);
break;
case DataType.HASH:
if (data instanceof Readable || data instanceof Blob) {
throw new Error(
`ERROR: Data cannot be Readable or Blob for ${dataType}`
);
}
hex = data;
break;
default:
throw new Error(`ERROR: unknown type ${dataType}`);
}
return hex;
}
private async validateAnchors(
anchors: IAnchors<IAnchor>,
dataHash: string
): Promise<boolean> {
let isValid = true;
for (const protocol of Object.keys(anchors)) {
switch (protocol) {
case Protocol.ETHEREUM:
isValid =
isValid && (await this.validateEthereumAnchor(anchors, dataHash));
break;
case Protocol.BITCOIN:
isValid =
isValid && (await this.validateBitcoinAnchor(anchors, dataHash));
break;
default:
throw new Error(`Unsupported protocol ${protocol}`);
}
}
return isValid;
}
private async validateEthereumAnchor(
anchors: IAnchors<IAnchor>,
dataHash: string
) {
let isValid = true;
for (const chainId of Object.keys(anchors[Protocol.ETHEREUM] || [])) {
const anchor = anchors[Protocol.ETHEREUM]?.[chainId];
if (anchor) {
if(anchor.nodeUrl.match(/mintnet/)){
// the mintnet network is discontinued.
// since all anchors are also on the mainnet and bitcoin, no security is lost.
return true;
}
const provider = InfuraProvider.getWebSocketProvider('homestead', this.config.ethereum.apiKey);
console.log(`Trying to validate ${this.addHexPrefix(anchor.transactionId)} on Infura`);
const tx = await provider.getTransaction(
this.addHexPrefix(anchor.transactionId)
);
if(!tx){
console.log(`Not found:`, anchor)
return false;
}
anchor.exists = tx.data === this.addHexPrefix(anchor.merkleRoot);
const merkleTools = new MerkleTools({
hashType: 'SHA3-512',
});
const validProof = merkleTools.validateProof(
anchor.proof,
dataHash,
anchor.merkleRoot
);
isValid = isValid && anchor.exists && validProof;
}
}
return isValid;
}
private async validateBitcoinAnchor(
anchors: IAnchors<IAnchor>,
dataHash: string
) {
let isValid = true;
for (const networkName of Object.keys(anchors[Protocol.BITCOIN] || [])) {
const anchor = anchors[Protocol.BITCOIN]?.[networkName];
if (anchor) {
try {
const txId = anchor.transactionId;
const tx = await Axios.get(
this.buildTxUrl(
this.config?.bitcoin?.url ||
'https://api.blockcypher.com/v1/btc/main',
txId
)
);
const txOutputs = tx.data.outputs;
let merkleRoot: string | null = null;
for (const output of txOutputs) {
if (output.data_hex !== undefined && output.data_hex !== null) {
merkleRoot = output.data_hex;
}
}
if (!merkleRoot) {
throw new Error('Merkle root is undefined');
}
anchor.exists = merkleRoot === anchor.merkleRoot;
const merkleTools = new MerkleTools({
hashType: 'SHA3-512',
});
const validProof = merkleTools.validateProof(
anchor.proof,
dataHash,
anchor.merkleRoot
);
isValid = isValid && anchor.exists && validProof;
} catch (error) {
if (error.response !== undefined && error.response.status === 429) {
throw new Error(
'Too many request to the blockcypher api, please add an apikey or upgrade your blockcypher plan'
);
// tslint:disable-next-line: unnecessary-else
} else {
throw error;
}
}
}
}
return isValid;
}
private async validateSignatures(
signatures: ISignatures
): Promise<SealStatus> {
let isValid = SealStatus.CONFIRMED;
for (const protocol of Object.keys(signatures)) {
for (const address of Object.keys(signatures[protocol])) {
// This should technically not be neccessary since we only anchor signatures on Ethereum
if (protocol === Protocol.ETHEREUM) {
const signature = signatures[protocol]?.[address];
if (signature) {
const signatureProvider = InfuraProvider.getWebSocketProvider('homestead', this.config.ethereum.apiKey);
const tx = await signatureProvider.getTransaction(
this.addHexPrefix(signature.transactionId)
);
if (tx) {
if (tx.data === this.addHexPrefix(signature.signature)) {
isValid =
isValid === SealStatus.CONFIRMED
? SealStatus.CONFIRMED
: isValid;
} else {
return SealStatus.FAILED;
}
}
if (
!tx &&
signature.transactionStatus &&
signature.transactionStatus === SealStatus.PENDING
) {
isValid = SealStatus.PENDING;
}
if (
!tx &&
(!signature.transactionStatus ||
signature.transactionStatus !== SealStatus.PENDING)
) {
return SealStatus.FAILED;
}
}
}
}
}
return isValid;
}
private async validateSignInvites(
signInvites: ISignInvites
): Promise<SealStatus> {
let isValid = SealStatus.CONFIRMED;
if (signInvites && signInvites.anchors) {
const signInviteAnchors = signInvites.anchors;
for (const protocol of Object.keys(signInviteAnchors)) {
for (const chainId of Object.keys(signInviteAnchors[protocol])) {
// This should technically not be neccessary since we only anchor signinvites on Ethereum
if (protocol === Protocol.ETHEREUM) {
const signInvite = signInviteAnchors[protocol]?.[chainId];
if (signInvite) {
const signInviteProvider = InfuraProvider.getWebSocketProvider('homestead', this.config.ethereum.apiKey);
const tx = await signInviteProvider.getTransaction(
this.addHexPrefix(signInvite.transactionId)
);
if (tx) {
signInvite.exists =
tx.data === this.addHexPrefix(signInvite.merkleRoot);
isValid =
isValid === SealStatus.CONFIRMED
? SealStatus.CONFIRMED
: isValid;
const merkleTools = new MerkleTools({
hashType: 'SHA3-512',
});
let validProof = true;
for (const inviteId of Object.keys(signInvite.invites || {})) {
const inviteAnchor = signInvite.invites?.[inviteId];
if (inviteAnchor) {
validProof = merkleTools.validateProof(
inviteAnchor.proof,
inviteAnchor.hash,
signInvite.merkleRoot
);
}
}
if (!validProof || !signInvite.exists) {
return SealStatus.FAILED;
}
}
if (
!tx &&
signInvite.transactionStatus &&
signInvite.transactionStatus === SealStatus.PENDING
) {
isValid = SealStatus.PENDING;
}
if (
!tx &&
(!signInvite.transactionStatus ||
signInvite.transactionStatus !== SealStatus.PENDING)
) {
return SealStatus.FAILED;
}
}
}
}
}
}
return isValid;
}
private async resolveSignatures(
signatures?: ISignatures
): Promise<ISignatures | undefined> {
if (signatures) {
for (const protocol of Object.keys(signatures || [])) {
for (const address of Object.keys(signatures?.[protocol] || [])) {
// This should technically not be neccessary since we only anchor signatures on Ethereum
if (protocol === Protocol.ETHEREUM) {
const signature = signatures?.[protocol]?.[address];
if (signature) {
const signatureProvider = InfuraProvider.getWebSocketProvider('homestead', this.config.ethereum.apiKey);
const tx = await signatureProvider.getTransaction(
this.addHexPrefix(signature.transactionId)
);
if (tx) {
if (tx.data === this.addHexPrefix(signature.signature)) {
// tslint:disable-next-line: ban-ts-ignore
// @ts-ignore
signatures[protocol][address].transactionStatus =
SealStatus.CONFIRMED;
}
}
}
}
}
}
}
return signatures;
}
private async resolveSignInvites(
signInvites: ISignInvites
): Promise<ISignInvites> {
if (signInvites && signInvites.anchors) {
const signInviteAnchors = signInvites.anchors;
for (const protocol of Object.keys(signInviteAnchors)) {
for (const chainId of Object.keys(signInviteAnchors[protocol])) {
// This should technically not be neccessary since we only anchor signinvites on Ethereum
if (protocol === Protocol.ETHEREUM) {
const signInvite = signInviteAnchors[protocol]?.[chainId];
if (signInvite) {
const signInviteProvider = InfuraProvider.getWebSocketProvider('homestead', this.config.ethereum.apiKey);
const tx = await signInviteProvider.getTransaction(
this.addHexPrefix(signInvite.transactionId)
);
if (
tx &&
tx.data === this.addHexPrefix(signInvite.merkleRoot) &&
signInviteAnchors[protocol]
) {
// tslint:disable-next-line: ban-ts-ignore
// @ts-ignore
signInviteAnchors[protocol][chainId].transactionStatus =
SealStatus.CONFIRMED;
}
}
}
}
}
}
return signInvites;
}
private addHexPrefix(fromValue: string) {
return this.isHexPrefixed(fromValue) ? fromValue : '0x' + fromValue;
}
private isHexPrefixed(valueToCheck: string) {
return valueToCheck.substring(0, 2) === '0x';
}
private async streamToHashForNode(stream: Readable): Promise<string> {
return new Promise((resolve, reject) => {
const allData: Buffer[] = [];
stream.on('data', (chunk) => {
allData.push(chunk);
});
stream.on('end', () => {
resolve(sha3_512(Buffer.concat(allData)));
});
stream.on('error', (error) => {
reject(error);
});
});
}
private async streamToHashForBrowser(file: Blob): Promise<string> {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onloadend = () => {
resolve(sha3_512(reader.result as ArrayBuffer));
};
reader.onerror = () => {
reject('Could not read file');
};
reader.readAsArrayBuffer(file);
});
}
private buildTxUrl(baseUrl: string, txId: string) {
const apiKeyParam = this.config?.bitcoin?.apiKey
? `?token=${this.config.bitcoin.apiKey}`
: '';
return `${baseUrl}/txs/${txId}${apiKeyParam}`;
}
private addInfuraApiKey(baseUrl: string) {
return baseUrl.match(/infura.io/) && this.config?.ethereum?.apiKey
? baseUrl.replace(
/infura.io/,
`infura.io/v3/${this.config.ethereum.apiKey}`
)
: baseUrl;
}
}
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