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Save ais / adsb images to disk

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This commit is contained in:
Zakary Timson
2026-09-12 12:04:57 -04:00
parent a60f605e6b
commit a99cbf3354
5 changed files with 54 additions and 20 deletions
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62
server/src/ais.mjs
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@@ -1,4 +1,7 @@
import {cfg} from './config.mjs';
import * as fs from 'node:fs';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';
const CHANNEL_MAP = {0: 'A, B', 1: 'A', 2: 'B'};
const SENDER_TYPE = {
@@ -8,6 +11,10 @@ const SENDER_TYPE = {
12: 'AtoN', 13: 'SART/EPIRB'
};
const DIR = dirname(fileURLToPath(import.meta.url));
const DATA = resolve(DIR, '../data');
const IMAGES_DIR = resolve(DATA, 'ships');
let aisCache = null;
let aisCacheTs = 0;
const AIS_TTL = 1000;
@@ -89,18 +96,47 @@ export async function getAIS() {
}
export async function getAISImage(mmsi) {
const res = await fetch(`https://www.vesselfinder.com/vessels/details/${mmsi}`, {
headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36' }
})
const html = await res.text()
const match = html.match(/<img.+main-photo.+>/)
if(!match) return null;
const srcMatch = match[0].match(/src="(.+?)"/)
if (!srcMatch) return null;
if(!mmsi) return null;
mmsi = String(mmsi);
let imgUrl = srcMatch[1]
if (imgUrl.startsWith('/')) imgUrl = `https://www.vesselfinder.com${imgUrl}`
return fetch(imgUrl, {
headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36' }
}).then(resp => resp.blob())
const filePath = resolve(IMAGES_DIR, `${mmsi}.jpg`);
if (fs.existsSync(filePath)) return fs.readFileSync(filePath);
function randomUA() {
const v = 36 + Math.floor(Math.random() * 40);
const builds = [
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.${v} (KHTML, like Gecko) Chrome/1${10 + ~~(Math.random() * 16)}.0.0.0 Safari/537.${v}`,
`Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.${v} (KHTML, like Gecko) Chrome/1${10 + ~~(Math.random() * 16)}.0.0.0 Safari/537.${v}`,
`Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.${v} (KHTML, like Gecko) Chrome/1${10 + ~~(Math.random() * 16)}.0.0.0 Safari/537.${v}`,
];
return builds[~~(Math.random() * builds.length)];
}
const html = await fetch(`https://www.vesselfinder.com/vessels/details/${mmsi}`, {
headers: {'Accept': '*/*', 'User-Agent': randomUA(), 'Referer': 'https://www.vesselfinder.com/'}
}).then(resp => {
if(resp.ok) return resp.text();
throw new Error('Failed to fetch vessel page');
});
const match = html.match(/<img.+main-photo.+>/);
if(!match) return null;
const srcMatch = match[0].match(/src="(.+?)"/);
if(!srcMatch) return null;
let imgUrl = srcMatch[1];
if(imgUrl.startsWith('//')) imgUrl = `https:${imgUrl}`;
if(imgUrl.startsWith('/')) imgUrl = `https://www.vesselfinder.com${imgUrl}`;
const resp = await fetch(imgUrl, {
headers: {'Accept': '*/*', 'User-Agent': randomUA(), 'Referer': 'https://www.vesselfinder.com/'}
});
if(!resp.ok) throw new Error('Failed to fetch image');
const buffer = Buffer.from(await resp.arrayBuffer());
fs.mkdirSync(IMAGES_DIR, { recursive: true });
fs.writeFileSync(filePath, buffer);
return buffer;
}

6
server/src/server.mjs
View File

@@ -163,10 +163,8 @@ app.get('/api/adsb/:icao', asyncHandler(async (req, res) => res.json(await getAD
app.get('/api/ais', asyncHandler(async (req, res) => res.json(await getAIS())));
app.get('/api/ais/:mmsi/image', asyncHandler(async (req, res) => {
const blob = await getAISImage(req.params.mmsi);
if (!blob) return res.status(404).send('No image found');
const buffer = Buffer.from(await blob.arrayBuffer());
res.contentType(blob.type).send(buffer);
const buffer = await getAISImage(req.params.mmsi);
res.contentType('image/jpeg').send(buffer)
}));
app.get('/api/sats', (_req, res) => res.json(getTinyGSData()));