Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { config as bskConfig } from 'blockstack'
import { SERVER_GLOBALS } from './server'
import { makeZoneFile } from 'zone-file'
import logger from 'winston'
import fetch from 'node-fetch'
import { crypto } from 'bitcoinjs-lib'
import RIPEMD160 from 'ripemd160'
import {
bufferCV,
bufferCVFromString,
getAddressFromPrivateKey,
makeContractCall,
TransactionVersion
} from '@stacks/transactions'
export type SubdomainOp = {
owner: string,
sequenceNumber: number,
zonefile: string,
subdomainName: string,
signature: string,
};
const deployedName = 'bns'
const ZONEFILE_TEMPLATE = '{$origin}\n{$ttl}\n{txt}{uri}'
// reconfigure obtaining consensus hash
bskConfig.network.getConsensusHash = async function () {
const httpResponse = await fetch('https://core.blockstack.org/v1/info')
const jsonResponse = await httpResponse.json()
const lastBlockSeen = SERVER_GLOBALS.lastSeenBlockHeight
if (jsonResponse.last_block_processed + 10 < lastBlockSeen) {
logger.error('core.blockstack.org is >10 blocks behind the chain tip', {
msgType: 'stale_core',
lastBlockSeen,
coreLastProcessed: jsonResponse.last_block_processed
})
throw new Error('core.blockstack.org is >10 blocks behind the chain tip')
}
const consensusHash = jsonResponse.consensus
logger.info(`Obtained consensus hash ${consensusHash}`, {
msgType: 'consensus_hash',
consensusHash
})
return consensusHash
}
export function destructZonefile(zonefile: string) {
const encodedZonefile = Buffer.from(zonefile).toString('base64')
// we pack into 250 byte strings -- the entry "zf99=" eliminates 5 useful bytes,
// and the max is 255.
const pieces = 1 + Math.floor(encodedZonefile.length / 250)
const destructed = []
for (let i = 0; i < pieces; i++) {
const startIndex = i * 250
const currentPiece = encodedZonefile.slice(startIndex, startIndex + 250)
if (currentPiece.length > 0) {
destructed.push(currentPiece)
}
}
return destructed
}
export function subdomainOpToZFPieces(operation: SubdomainOp) {
const destructedZonefile = destructZonefile(operation.zonefile)
const txt = [
`owner=${operation.owner}`,
`seqn=${operation.sequenceNumber}`,
`parts=${destructedZonefile.length}`
]
destructedZonefile.forEach((zfPart, ix) => txt.push(`zf${ix}=${zfPart}`))
if (operation.signature) {
txt.push(`sig=${operation.signature}`)
}
return {
name: operation.subdomainName,
txt
}
}
export function makeUpdateZonefile(
domainName: string,
uriEntries: Array<{
name: string,
target: string,
priority: number,
weight: number,
}>,
updates: Array<SubdomainOp>,
maxZonefileBytes: number
) {
const subdomainRecs = []
const zonefileObject = {
$origin: domainName,
$ttl: 3600,
uri: uriEntries,
txt: subdomainRecs
}
const submitted = []
logger.debug('Constructing zonefile: ')
logger.debug(zonefileObject)
let outZonefile = makeZoneFile(zonefileObject, ZONEFILE_TEMPLATE)
for (let i = 0; i < updates.length; i++) {
subdomainRecs.push(subdomainOpToZFPieces(updates[i]))
const newZonefile = makeZoneFile(zonefileObject, ZONEFILE_TEMPLATE)
if (newZonefile.length < maxZonefileBytes) {
outZonefile = newZonefile
submitted.push(updates[i].subdomainName)
} else {
break // zonefile got too long, use last generated one!
}
}
return {
zonefile: outZonefile,
submitted
}
}
async function nameUpdate(
namespace: string,
name: string,
attachment: string,
pkey: string,
network
) {
const deployedTo = bskConfig.network.version === TransactionVersion.Mainnet ? 'SP000000000000000000002Q6VF78' : 'ST000000000000000000002AMW42H'
const txOptions = {
contractAddress: deployedTo,
contractName: deployedName,
functionName: 'name-update',
functionArgs: [
bufferCVFromString(namespace),
bufferCVFromString(name),
bufferCV(hash160(Buffer.from(attachment)))
],
senderKey: pkey,
validateWithAbi: true,
network: network
}
const transaction = await makeContractCall(txOptions)
return transaction.serialize().toString('hex')
}
export async function submitUpdate(
domainName: string,
zonefile: string,
ownerKey: string,
paymentKey: string
) {
const ownerAddress = getAddressFromPrivateKey(
ownerKey,
bskConfig.network.version
)
const deconstruct = domainName.split('.')
Iif (deconstruct.length != 2) {
throw new Error('Invalid domain name')
}
const nameInfoUrl = bskConfig.network.blockstackAPIUrl + '/v1/names/' + domainName
const nameInfoRequest = await fetch(nameInfoUrl)
const nameInfo = await nameInfoRequest.json()
if (nameInfo.address !== ownerAddress) {
throw new Error(
`Domain name ${domainName} not owned by address ${ownerAddress}`
)
} // owner validated
const name = deconstruct[0]
const namespace = deconstruct[1]
try {
const txHex = await nameUpdate(
namespace,
name,
zonefile,
paymentKey,
bskConfig.network
)
const atch_hex = Buffer.from(zonefile).toString('hex')
const body = {
attachment: atch_hex,
tx: txHex
}
const result = await fetch(bskConfig.network.getBroadcastApiUrl(), {
method: 'post',
body: JSON.stringify(body),
headers: { 'Content-Type': 'application/json' }
})
const parsedResponse = await result.json()
if (result.status === 200) {
return parsedResponse
}
throw new Error(JSON.stringify(parsedResponse))
} catch (err) {
throw new Error('Error post transaction: ' + err.message)
}
}
export async function updateGlobalBlockHeight(): Promise<void> {
try {
const httpRequest = await fetch(bskConfig.network.getInfoUrl())
const { status } = httpRequest
const response = await httpRequest.json()
Eif (status == 200) {
const blockHeight = response.burn_block_height
Iif (SERVER_GLOBALS.lastSeenBlockHeight > blockHeight) {
throw new Error(
`Last seen block ${SERVER_GLOBALS.lastSeenBlockHeight} is greater than returned block height ${blockHeight}`
)
}
SERVER_GLOBALS.lastSeenBlockHeight = blockHeight
} else {
throw new Error(response.message)
}
} catch (error) {
throw new Error('Error fetching block height. ' + error.message)
}
}
/* eslint-disable */
async function broadcastZonefile(zonefile: string) {
const body = {
zonefile: zonefile,
};
try {
const result = await fetch(bskConfig.network.coreApiUrl + "/v1/zonefile", {
method: "post",
body: JSON.stringify(body),
headers: { "Content-Type": "application/json" },
});
console.log("status code", result.status);
const txHash = await result.json();
console.log("zone file tx hash", txHash);
return txHash;
} catch (error) {
throw new Error("Failed to broadcast zonefile.");
}
}
/* eslint-disable */
export async function checkTransactions(
txs: Array<{ txHash: string, zonefile: string, blockHeight: number }>
): Promise<Array<{ txHash: string, status: boolean, blockHeight: number }>> {
await updateGlobalBlockHeight();
const blockHeight = SERVER_GLOBALS.lastSeenBlockHeight;
return await Promise.all(
txs.map(async (tx) => {
if (!tx.blockHeight || tx.blockHeight <= 0) {
// const txInfo = await bskConfig.network.getTransactionInfo(tx.txHash)
const url = new URL(
bskConfig.network.blockstackAPIUrl + `/extended/v1/tx/0x${tx.txHash}`
);
const httpRequest = await fetch(url);
const reqText = await httpRequest.text();
let txInfo;
try {
txInfo = JSON.parse(reqText);
} catch (error) {
logger.error(`Error parsing JSON from ${url.toString()} ${error}, received: ${reqText}`);
throw error;
}
if (!txInfo.block_height) {
logger.info("Could not get block_height, probably unconfirmed.", {
msgType: "unconfirmed",
txid: tx.txHash,
});
return { txHash: tx.txHash, status: false, blockHeight: -1 };
} else {
tx.blockHeight = txInfo.block_height;
}
}
if (tx.blockHeight + 7 > blockHeight) {
logger.debug(
`block_height for ${tx.txHash}: ${tx.blockHeight} --- has ${
1 + blockHeight - tx.blockHeight
} confirmations`
);
return {
txHash: tx.txHash,
status: false,
blockHeight: tx.blockHeight,
};
} else {
try {
Iif (
bskConfig.network.blockstackAPIUrl === "https://core.blockstack.org"
) {
await directlyPublishZonefile(tx.zonefile);
// this is horrible. I know. but the reasons have to do with load balancing
// on node.blockstack.org and Atlas peering.
await directlyPublishZonefile(tx.zonefile);
return {
txHash: tx.txHash,
status: true,
blockHeight: tx.blockHeight,
};
} else {
// await broadcastZonefile(tx.zonefile) //todo
return {
txHash: tx.txHash,
status: true,
blockHeight: tx.blockHeight,
};
}
} catch (err) {
logger.error(`Error publishing zonefile for tx ${tx.txHash}: ${err}`);
return {
txHash: tx.txHash,
status: false,
blockHeight: tx.blockHeight,
};
}
}
})
);
}
export function hash160(input: Buffer) {
const sha256 = crypto.sha256(input);
return new RIPEMD160().update(sha256).digest();
}
// this is a hack -- this is a stand-in while we roll out support for
// publishing zonefiles via core.blockstack
export async function directlyPublishZonefile(
zonefile: string
): Promise<boolean> {
// speak directly to node.blockstack
const b64Zonefile = Buffer.from(zonefile).toString("base64");
const postData =
"<?xml version='1.0'?>" +
"<methodCall><methodName>put_zonefiles</methodName>" +
`<params><param><array><data><value>
<string>${b64Zonefile}</string></value>
</data></array></param></params>` +
"</methodCall>";
const resp = await fetch("https://node.blockstack.org:6263/RPC2", {
method: "POST",
body: postData,
});
const respText = await resp.text();
if (!(resp.status >= 200 && resp.status <= 299)) {
logger.error(
`Publish zonefile error: Response code from node.blockstack: ${resp.status}`
);
logger.error(
`Publish zonefile error: Response from node.blockstack: ${respText}`
);
throw new Error(
"Failed to publish zonefile. Bad response from node.blockstack"
);
}
const start = respText.indexOf("<string>") + "<string>".length;
const stop = respText.indexOf("</string>");
const dataResp = respText.slice(start, stop);
let jsonResp;
try {
jsonResp = JSON.parse(dataResp);
} catch (err) {
logger.error(
`Failed to parse JSON response from node.blockstack: ${respText}`
);
throw err;
}
if ("error" in jsonResp) {
logger.error(`Error in publishing zonefile: ${JSON.stringify(jsonResp)}`);
throw new Error(jsonResp.error);
}
if (!jsonResp.saved || jsonResp.saved.length < 1) {
throw new Error('Invalid "saved" response from node.blockstack');
}
if (jsonResp.saved[0] === 1) {
return true;
} else if (jsonResp.saved[0] === 0) {
throw new Error("Zonefile not saved");
}
throw new Error('Invalid "saved" response from node.blockstack');
}
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