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const { spawn } = require('child_process');
const fs = require("fs");
const config = require("../../config");
/*
* Returns a cached zblock
*
* Returns:
* - JSON object
*
*/
function fetchZblock(zblock, res){
regex= /Qm[A-Za-z0-9]{44}/;
if (regex.test(zblock)){
const command = spawn("ak-zblock",["--cache",zblock]);
command.on("close", code => {
console.warn(`child process exited with code ${code}`);
if ( code === 0 ) {
const path = config.cacheDir+"/fzblocks/"+zblock;
console.log(path)
try {
if(fs.existsSync(path)){
var buffer = fs.readFileSync(path);
res.writeHead(200, {'Content-Type': 'application/json'});
res.end(JSON.stringify(JSON.parse(buffer)));
}
} catch (error) {
res.writeHead(404, {'Content-Type': 'application/json'});
res.end({"error":error.message});
}
} else if ( code === 2){
res.writeHead(404, {'Content-Type': 'application/json'});
res.end({"error":"The roof is on fire"});
} else {
res.writeHead(404, {'Content-Type': 'application/json'});
res.end({"error":"invalid or unreachable"});
}
});
} else {
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({error:"Invalid data: regexp failed to pass"}));
}
};
module.exports = (req, res) => {
var args = req.url.split("/");
if ( (args[2] === 'zblock') && args[3] && typeof args[3] === "string" && args[3].length === 46 ){
regex= /Qm[A-Za-z0-9]{44}/;
if (regex.test(args[3])){
if (args[3] === "QmbFMke1KXqnYyBBWxB74N4c5SBnJMVAiMNRcGu6x1AwQH" ){
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({error:"Genesis block"}));
} else {
fetchZblock(args[3],res);
}
} else {
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({error:"Invalid data: regexp failed to pass"}));
}
} else {
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({error:"Invalid data: no valid zblock was provided"}));
}
}
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