Use ejs as template engine

    Fix open graph tags

package.json

@@ -13,6 +13,7 @@
   "license": "GPL-3.0",
   "dependencies": {
     "canvas": "2.0.0-alpha.5",
+    "ejs": "^2.5.7",
     "express": "^4.16.1"
   }
 }

srv.js

@@ -8,6 +8,7 @@ const app = express();
 const config = require('./config.json');
 
 app.set('x-powered-by', false);
+app.set('view engine', 'ejs');
 app.use(express.static('./static'));
 
 // {name: filepath}
@@ -106,7 +107,7 @@ app.get('/generate.png', function (req, res) {
 });
 
 app.get('/', function(req, res) {
-  res.sendfile('./static/index.html');
+  res.render('index', {host: req.headers.host});
 })
 
 app.listen(process.env.PORT || config.port || 80);

static/index.html → views/index.ejs

@@ -4,9 +4,9 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta property="og:title" content="Soutenez La Quadrature du Net !" />
-    <meta property="og:type" content="" />
-    <meta property="og:url" content="." />
-    <meta property="og:image" content="./generate.png" />
+    <meta property="og:type" content="Soutenez La Quadrature du Net !" />
+    <meta property="og:url" content="http://<%= host %>" />
+    <meta property="og:image" content="http://<%= host %>/generate.png" />
     <link rel="stylesheet" href="./bootstrap-grid.min.css" />
     <link rel="stylesheet" href="./font-awesome.min.css" />
     <link rel="stylesheet" href="./style.css" />