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1_scrape.js
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1_scrape.js
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"use strict"
const fs = require('fs');
const canvas = require('canvas');
const {resolve} = require('path');
const https = require('https');
const child_process = require('child_process');
const URL = require('url');
const {Image, createCanvas} = require('canvas');
const cacheFetch = new Cache(resolve(__dirname, 'cache'));
const FLIPPED_HORIZONTALLY_FLAG = 0x80000000;
const FLIPPED_VERTICALLY_FLAG = 0x40000000;
const FLIPPED_DIAGONALLY_FLAG = 0x20000000;
let links = [];
let queue = new Queue();
queue.add('https://lobby.maps.at.rc3.world/main.json');
run();
async function run() {
while (!queue.empty()) {
let url = queue.next();
let data = await fetch(url);
if (!data) continue;
data = data.toString('utf8');
if (data.startsWith('<!doctype html>')) continue;
try {
data = JSON.parse(data);
} catch (e) {
console.log(data);
console.log('SCRAPING PROBLEMS', e)
continue;
}
scanForMapUrls(url, data);
try {
await generateScreenshot(url, data);
} catch (e) {
console.log('SCREENSHOT PROBLEMS', e)
continue;
}
}
fs.writeFileSync('data/links.json', JSON.stringify(links, null, '\t'), 'utf8');
}
function Queue() {
let list = [];
let set = new Set();
return { add, empty, next }
function add(url) {
let key = url.toLowerCase().replace(/[^a-z0-9]/g,'');
if (set.has(key)) return false;
set.add(key);
list.push(url);
return true;
}
function empty() {
return list.length === 0
}
function next() {
return list.shift();
}
}
function fetch(url) {
let key = hashUrl(url);
return cacheFetch(key, () => {
// Everything is offline :(
return new Promise((resolve, reject) => reject());
console.log(' fetch', url);
return new Promise((resolve, reject) => {
https.get(url, {timeout:10*1000}, res => {
let buffers = [];
res.on('data', chunk => buffers.push(chunk));
if (res.statusCode !== 200) {
console.log(url, res.statusCode, res.statusMessage);
return reject();
}
res.on('error', () => reject())
res.on('end', () => resolve(Buffer.concat(buffers)));
}).on('error', () => reject())
})
})
}
function Cache(dir) {
fs.mkdirSync(dir, {recursive:true});
return async function (key, cb) {
let filename = resolve(dir, key);
if (fs.existsSync(filename)) return fs.promises.readFile(filename);
try {
let result = await cb();
fs.writeFileSync(filename, result);
return result;
} catch (e) {
//console.log('cache failed');
return false;
}
}
}
async function generateScreenshot(baseUrl, data) {
let key = hashUrl(baseUrl);
let pngFilename = resolve(__dirname, 'image', key+'.png');
if (fs.existsSync(pngFilename)) return;
if (data.infinite) return;
console.log(' generateScreenshot', pngFilename);
let tiles = [];
//if (data.renderorder !== 'right-down') throw Error();
if (data.tilewidth !== 32) throw Error();
if (data.tileheight !== 32) throw Error();
if (data.type !== 'map') throw Error();
if (data.orientation !== 'orthogonal') throw Error();
//console.log(' tileset');
//console.dir(data, {depth:9});
for (let tileset of data.tilesets) {
//console.log(tileset.name);
if (!tileset.tileheight) continue;
if (!tileset.tilewidth) continue;
if (tileset.backgroundcolor) {console.log(tileset); throw Error()};
if (tileset.objectalignment) {console.log(tileset); throw Error()};
if (tileset.tileoffset) {console.log(tileset); throw Error()};
tileset.margin = tileset.margin || 0;
tileset.spacing = tileset.spacing || 0;
let image;
if (tileset.image) {
image = await loadImage(tileset.image);
if (image) {
if (tileset.transparentcolor) image = await makeColorTransparent(image, tileset.transparentcolor);
for (let i = 0; i < tileset.tilecount; i++) {
let x = tileset.margin + (tileset.spacing+tileset.tilewidth)*(i % tileset.columns);
let y = tileset.margin + (tileset.spacing+tileset.tileheight)*(Math.floor(i/tileset.columns));
tiles[i+tileset.firstgid] = { image, x, y, w:tileset.tilewidth, h:tileset.tileheight };
}
}
}
//console.log('tileset.tiles');
if (!tileset.tiles) continue;
for (let t of tileset.tiles) {
if (t.animation && t.animation[0].tileid) {
tiles[t.id+tileset.firstgid] = tiles[t.animation[0].tileid+tileset.firstgid]
continue;
}
if (!t.image) {
if (image) {
let x = tileset.margin + (tileset.spacing+tileset.tilewidth)*(t.id % tileset.columns);
let y = tileset.margin + (tileset.spacing+tileset.tileheight)*(Math.floor(t.id/tileset.columns));
tiles[t.id+tileset.firstgid] = { image, x, y, w:tileset.tilewidth, h:tileset.tileheight };
}
continue;
}
if (!t.imageheight || !t.imagewidth) throw Error();
let image2 = await loadImage(t.image);
if (!image2) continue;
if (tileset.transparentcolor) image2 = await makeColorTransparent(image2, tileset.transparentcolor);
tiles[t.id+tileset.firstgid] = {
image:image2,
x:0,
y:0,
w:t.imagewidth,
h:t.imageheight
}
}
}
async function makeColorTransparent(image, color) {
if (color.length !== 7) throw Error();
if (color[0] !== '#') throw Error();
color = [
parseInt(color.slice(1,3), 16),
parseInt(color.slice(3,5), 16),
parseInt(color.slice(5,7), 16),
]
let width = image.width;
let height = image.height;
let canvas2 = createCanvas(width, height);
let ctx2 = canvas2.getContext('2d');
ctx2.drawImage(image, 0, 0);
let imageData = ctx2.getImageData(0,0,width,height);
let data = imageData.data;
for (let i = 0; i < data.length; i += 4) {
if (data[i+0] !== color[0]) continue;
if (data[i+1] !== color[1]) continue;
if (data[i+2] !== color[2]) continue;
data[i + 3] = 0;
}
ctx2.putImageData(imageData, 0, 0);
return canvas2;
}
function loadImage(url) {
if (!url) return new Promise(r => r(false));
url = URL.resolve(baseUrl, url);
url = url.replace(/#.*/,'');
return new Promise((cbResolve, cbReject) => {
const img = new Image();
img.onload = () => cbResolve(img);
img.onerror = err => cbReject(err);
fetch(url).catch(e => cbResolve(false)).then(buffer => {
if (!buffer) return cbResolve(false);
img.src = buffer
});
})
}
let layerData = [];
let visibleLayers = data.layers;
visibleLayers = visibleLayers.filter(l => {
if (l.type !== 'group') return true;
l.layers.forEach(l => visibleLayers.push(l));
return false;
})
visibleLayers = visibleLayers.filter(l => {
if (!l.visible) return false;
if (l.opacity === 0) return false;
if (l.type === 'objectgroup') return false;
if (l.type === 'imagelayer') return false; // sorry
if (l.type !== 'tilelayer') {console.log(l); throw Error();}
if (l.height !== data.height) {console.log(l); throw Error();}
if (l.width !== data.width) {console.log(l); throw Error();}
if (l.x !== 0) {console.log(l); throw Error();}
if (l.y !== 0) {console.log(l); throw Error();}
if (!l.data) {console.log(l); throw Error();}
if (l.chunks) {console.log(l); throw Error();}
return true;
})
let canvas = createCanvas(data.width*32, data.height*32);
let ctx = canvas.getContext('2d', {alpha: true});
if (data.backgroundcolor) {
ctx.fillStyle = data.backgroundcolor;
ctx.fillRect(0, 0, data.width*32, data.height*32)
} else {
ctx.clearRect(0, 0, data.width*32, data.height*32)
}
for (let y0 = 0; y0 < data.height; y0++) {
for (let x0 = 0; x0 < data.width; x0++) {
let index = x0 + y0*data.width;
visibleLayers.forEach(l => {
let tileIndex = l.data[index];
if (!tileIndex) return;
// Read out the flags
let flipped_horizontally = Boolean(tileIndex & FLIPPED_HORIZONTALLY_FLAG);
let flipped_vertically = Boolean(tileIndex & FLIPPED_VERTICALLY_FLAG);
let flipped_diagonally = Boolean(tileIndex & FLIPPED_DIAGONALLY_FLAG);
let rotation = 0;
let flipped = false;
if (flipped_horizontally) {
if (flipped_vertically) {
if (flipped_diagonally) {
rotation = Math.PI / 2;
flipped = true;
} else {
rotation = Math.PI;
flipped = false;
}
} else {
if (flipped_diagonally) {
rotation = Math.PI / 2;
flipped = false;
} else {
rotation = 0;
flipped = true;
}
}
} else {
if (flipped_vertically) {
if (flipped_diagonally) {
rotation = 3 * Math.PI / 2;
flipped = false;
} else {
rotation = Math.PI;
flipped = true;
}
} else {
if (flipped_diagonally) {
rotation = 3 * Math.PI / 2;
flipped = true;
} else {
rotation = 0;
flipped = false;
}
}
}
// Clear the flags
tileIndex &= ~(FLIPPED_HORIZONTALLY_FLAG | FLIPPED_VERTICALLY_FLAG | FLIPPED_DIAGONALLY_FLAG);
let tile = tiles[tileIndex];
if (!tile) return;
if (!tile.image) return;
ctx.save();
let halfWidth = tile.w / 2;
let halfHeight = tile.h / 2;
ctx.translate(x0*32 + halfWidth, y0*32 + halfHeight);
let h_scale = flipped ? -1 : 1;
ctx.scale(h_scale,1);
ctx.rotate(rotation);
ctx.globalAlpha = l.opacity;
ctx.drawImage(tile.image, tile.x, tile.y, tile.w, tile.h, -halfWidth, -halfHeight, tile.w, tile.h);
ctx.restore();
})
}
}
fs.writeFileSync(pngFilename, canvas.toBuffer('image/png'));
child_process.execSync('optipng '+pngFilename, {stdio:'ignore'});
return
}
function scanForMapUrls(baseUrl, data) {
let mapLinks = [];
data.layers.forEach(l => {
if (!l) return;
if (!l.properties) return;
l.properties.forEach(p => {
switch (p.name.toLowerCase()) {
case 'collide':
case 'collides':
case 'collision':
case 'depth':
case 'exitlayer':
case 'getbadge':
case 'getbadge_x':
case 'jitsi':
case 'jitsiinstance':
case 'jitsiroom':
case 'jitsiroomvizmain1':
case 'jitsitrigger':
case 'loop':
case 'openaudio':
case 'openwebsite':
case 'playaudio':
case 'playaudioloop':
case 'silent':
case 'start':
case 'startlayer':
case 'start_layer':
case 'stew.one':
case 'wilkommen':
case 'xjitsitrigger':
case 'xopenwebsitetrigger':
return;
case 'exiturl':
case 'exitsceneurl':
let url = URL.resolve(baseUrl, p.value);
url = url.replace(/#.*/,'');
if ((l.x !== 0) || (l.y !== 0)) {
console.log(l);
throw Error();
}
if (l.data) {
let xs = 0, ys = 0, s = 0;
l.data.forEach((c,i) => {
if (!c) return;
let x = (i % l.width);
let y = Math.floor(i/l.width);
xs += x; ys += y; s++;
})
if (s > 0) mapLinks.push({url,hash:hashUrl(url),x:xs/s,y:ys/s});
}
if (l.chunks) {
l.chunks.forEach(chunk => {
let xs = 0, ys = 0, s = 0;
chunk.data.forEach((c,i) => {
if (!c) return;
let x = chunk.x + (i % chunk.width);
let y = chunk.y + Math.floor(i/chunk.width);
xs += x; ys += y; s++;
})
if (s > 0) mapLinks.push({url,hash:hashUrl(url),x:xs/s,y:ys/s});
})
}
queue.add(url);
break;
default:
console.log(p);
throw Error(p.name);
}
})
})
links.push({
width:data.width,
height:data.height,
url:baseUrl,
hash:hashUrl(baseUrl),
links:mapLinks,
})
}
function hashUrl(url) {
return url.replace(/[^a-z0-9_\-]/gi, '_');
}