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const { spawn } = require('child_process');
const fs = require("fs");
const config = require("../../config");
/*
* Gets a local merkle leaf
*
* Returns:
* the merkle leaf
*
*/
function fetchFmrk(mrk, res){
const command = spawn("cat",[config.workDir+"/fmrk/"+mrk]);
res.set('Content-Type', 'application/json');
command.stdout.on("data", 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 exited with code ${code}`);
if ( code === 0 ) {
const path = config.workDir+"/fmrk/"+mrk;
console.log(path)
try {
if(fs.existsSync(path)){
res.send(fs.readFileSync(path));
}
} catch (error) {
res.send({"error":error.message});
}
} else if ( code === 2){
res.send({"error":"The roof is on fire"});
} else {
res.send({"error":"invalid or unreachable"});
}
});
};
module.exports = (req, res) => {
console.log(req.params)
res.set('Content-Type', 'application/json');
if ( (req.params.mrk) && req.params.mrk.length === 128 ){
regex= /[a-f0-9]{128}/;
if (regex.test(req.params.mrk)){
if (req.params.mrk === "QmbFMke1KXqnYyBBWxB74N4c5SBnJMVAiMNRcGu6x1AwQH" ){
res.send({error:"Genesis block"});
} else {
fetchFmrk(req.params.mrk,res);
}
} else {
res.send({error:"Invalid data: regexp failed to pass"});
}
} else {
res.send({error:"Invalid data: no valid zblock was provided"});
}
}
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