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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 fetchIPFShash(zblock, res)
{
regex= /Qm[A-Za-z0-9]{44}/;
if (regex.test(zblock)){
const path = `${config.ipfsArtifactsDir}/${zblock}`;
console.log(path)
try
{
if(fs.existsSync(path))
{
res.writeHead(200, {'Content-Type': 'application/json'});
res.end(JSON.stringify(JSON.parse(fs.readFileSync(path))));
}
else
{
res.writeHead(404, {'Content-Type': 'application/json'});
res.end(JSON.stringify({error:"invalid or unreachable"}));
}
}
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:"Invalid data: regexp failed to pass"}));
}
};
module.exports = (req, res) => {
var args = req.url.split("/");
if ( (args[2] === 'ipfs_hash') && 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
{
fetchIPFShash(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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