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main.js
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main.js
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const { createCanvas, registerFont } = require("canvas");
const { Canvas } = require("./canvas.js");
const http = require('http');
const escape = require('escape-html');
const process = require('process');
const fs = require('fs');
const crypto = require('crypto');
var server_config;
try {
server_config = require('./server_config.json');
} catch (e) {
server_config = {
hostname: null || process.env.GSAPI_HOSTNAME,
ssl: false || (process.env.GSAPI_SSL=='1'?true:false)
}
}
const APP_VER = '2.0';
let CLUSTER_ID = 1;
let currentTasks = 0;
// webp-converter対策
if (!fs.existsSync('node_modules/webp-converter/temp')) {
fs.mkdirSync('node_modules/webp-converter/temp');
}
/* globals Canvas */
var _canvas = null;
registerFont('./notobk-subset.otf', {family: 'notobk'});
registerFont('./notoserifbk-subset.otf', {family: 'notoserifbk'});
function toArrayBuffer(buffer) {
var ab = new ArrayBuffer(buffer.length);
var view = new Uint8Array(ab);
for (var i = 0; i < buffer.length; ++i) {
view[i] = buffer[i];
}
return ab;
}
if (process.argv.length > 2) {
if (!isNaN(process.argv[2])) {
CLUSTER_ID = Number(process.argv[2]);
}
}
if (process.env.CLID) CLUSTER_ID = Number(process.env.CLID);
const PORT = process.env.PORT || 8080;
console.log(`
*** 5000choyen API Server v${APP_VER} ***
(C)2021 CyberRex
Hostname: ${server_config.hostname}
Listening on 127.0.0.1 port ${PORT}
URL: ${server_config.ssl?'https':'http'}://${server_config.hostname?server_config.hostname:'127.0.0.1'}${PORT==80?'':':'+PORT}/
`);
http.createServer(function (req, resp) {
var hostname = server_config.hostname || req.host;
if (req.url == '/' || req.url == '/index.html') {
resp.writeHead(200, {'Content-type': 'text/html'});
resp.end('<!DOCTYPE html><head><meta charset="utf-8"><title>5000兆円ほしい！</title></head><body><h1>5000兆円ほしい！</h1><h2>使い方</h2><p>例: ' + (server_config.ssl ? 'https':'http') + '://' + hostname + '/image?top=上部文字列&bottom=下部文字列</p><br><p>(C)2021 CyberRex<br>Under GPL3.0 License</p><br><small>Runtime v'+APP_VER+'<br>Cluster#'+CLUSTER_ID+'</small></body></html>');
return;
}
if (req.url.match(/^\/image\?/)) {
if (currentTasks > 16) {
resp.writeHead(429, {'Content-type': 'text/html;charset=utf-8'});
resp.end('<h1>Too many requests</h1>');
return;
}
var queryString = req.url.split('?')[1];
var args = [...new URLSearchParams(queryString).entries()].reduce((obj, e) => ({...obj, [e[0]]: e[1]}), {});
var hoshii = false;
var noalpha = false;
var rainbow = false;
var imgtype = 'png';
var single = false;
var debug = false;
if (args.hoshii) {
hoshii = args.hoshii=='true' ? true : false;
}
if (args.noalpha) {
noalpha = args.noalpha=='true' ? true : false;
}
if (args.rainbow) {
rainbow = args.rainbow=='true' ? true : false;
}
if (args.single) {
single = args.single=='true' ? true : false;
}
if (args.debug) {
debug = args.debug=='true' ? true : false;
}
if (!args.top && (!single || (single && !args.bottom))) {
resp.writeHead(400, {'Content-type': 'text/html;charset=utf-8'});
resp.end('<h1>Bad Request</h1>パラメータtopが不足しています。');
return;
}
if (!args.bottom && !hoshii && (!single || (single && !args.top))) {
resp.writeHead(400, {'Content-type': 'text/html;charset=utf-8'});
resp.end('<h1>Bad Request</h1>パラメータbottomが不足しています。');
return;
}
if (args.type) {
if (args.type === 'jpg') {
args.type = 'jpeg';
}
if (args.type != 'png' && args.type != 'jpeg' && args.type != 'webp') {
resp.writeHead(400, {'Content-type': 'text/html;charset=utf-8'});
resp.end('<h1>Bad Request</h1>パラメータtypeの値が異常です。');
return;
}
imgtype = args.type;
}
if (single) {
if (args.top && args.bottom) {
resp.writeHead(400, {'Content-type': 'text/html;charset=utf-8'});
resp.end('<h1>Bad Request</h1>パラメータtopとbottomは同時に指定できません');
return;
}
single = true;
}
const sha1sum = crypto.createHash('sha1');
sha1sum.update(JSON.stringify(args));
const cachefname = sha1sum.digest('hex');
const cachename = '/tmp/5000_'+cachefname+'.'+imgtype;
let fileExist = false;
try {
const cachefile = fs.statSync(cachename);
fileExist = true;
} catch(e) {
fileExist = false;
}
if (fileExist) {
const data = fs.readFileSync(cachename);
resp.writeHead(200, {'Content-type': 'image/'+imgtype});
resp.write(data);
resp.end();
return;
}
if (!args.top) args.top = '';
if (!args.bottom) args.bottom = '';
// vulnerability countermeasures
if (args.top.length > 50 || args.bottom.length > 50) {
resp.writeHead(400, {'Content-type': 'text/html;charset=UTF-8'});
resp.write('<h1>Bad Request</h1>');
resp.end();
return;
}
currentTasks++;
const canvas = new Canvas(createCanvas(3840,1080), {hoshii: hoshii, noalpha: noalpha, single: single, debug: debug});
if (!single) {
canvas.redrawTop(args.top, rainbow);
if (! hoshii) {
canvas.redrawBottom(args.bottom, null, rainbow);
} else {
canvas.redrawImage();
}
}else{
if (args.top) {
canvas.redrawTop(args.top, rainbow);
}else{
canvas.redrawBottom(args.bottom, null, rainbow);
}
}
resp.writeHead(200, {'Content-type': 'image/'+imgtype});
canvas.createBuffer(imgtype, function (data) {
resp.write(data);
resp.end();
fs.writeFileSync(cachename, data); // save cache
currentTasks--;
}, args.q);
return;
} else if (req.url=='/image') {
resp.writeHead(200, {'Content-type': 'text/html;charset=utf-8'});
resp.end('<h1>Invalid Request</h1>');
return;
}
resp.writeHead(404, {'Content-type': 'text/html'});
resp.end('<h1>Not Found</h1><p>The requested URL '+escape(req.url)+' was not found on this server.</p>');
}).listen(PORT);