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const { spawn } = require('child_process');
const fs = require('fs');
const config = require("../../config.js");
/*
* Gets the local latest zblock AKA zlatest
*
* Returns:
* - JSON object
* { zlatest: "Qm..." }
*
*/
function decodeBase64ToHex(base64String) {
// Decode the Base64 string
const binaryString = atob(base64String);
// Convert the binary string to a byte array
const byteArray = new Uint8Array(binaryString.length);
for (let i = 0; i < binaryString.length; i++) {
byteArray[i] = binaryString.charCodeAt(i);
}
// Convert the byte array to a hex string representation
return Array.from(byteArray)
.map(byte => byte.toString(16).padStart(2, '0')) // Convert to hex and pad with zeros
.join(''); // Join with spaces for readability
}
// Example usage
function replyIfOkay(key, res)
{
const program = "ak-ns";
const base64String = key;
const decodedHexString = decodeBase64ToHex(base64String);
formatted_key = decodedHexString.toUpperCase();
const command = spawn(program, ["-rk", `${formatted_key}`]);
var buffer = "";
command.stdout.on("data", data => {
buffer += data;
});
command.stderr.on("data", data => {
console.log(`stderr: ${data}`);
});
command.on('error', (error) => {
console.log(`error: ${error.message}`);
});
command.on("close", code => {
console.log(`child process ${program} exited with code ${code}`);
if (code === 0){
buffer = buffer.trim()
res.writeHead(200, {'Content-Type': 'application/json'});
res.end(JSON.stringify({
key:`${formatted_key}`,
resolved:`${buffer}`
}));
} else {
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({error:"unreachable"}));
}
});
}
function getAKNSKeyFromBase(req, res)
{
var args = req.url.split("/");
var key = args[3];
regex= /[a-zA-Z0-9+\/=]{29}/
const base64Regex = /^[A-Z0-9+\/=]/i;
if (base64Regex.test(key))
{
// key = key.toUpperCase();
// var path = config.akNSDir+"/"+key;
try
{
replyIfOkay(key, res)
}
catch (error)
{
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({"error":error.message}));
}
}
else
{
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({error:"No hash"}));
}
}
module.exports = getAKNSKeyFromBase;
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