support x-forwarded-for for multiverse

app.js

@@ -37,6 +37,7 @@ app.use(function(req, res, next){
     req.universe = process.env.UNIVERSE;
   } else if(req.app.get('env') === 'production'){
     req.universe = req.hostname.replace('.r-universe.dev', '');
+    res.locals.vhost = req.headers['r-universe-vhost'];
   }
   res.locals.universe = req.universe || 'ropensci';
   res.locals.node_env = req.app.get('env');

static/pkginfo.js

@@ -7,9 +7,10 @@ function update_copy_gist(){
   var link = $('#copy-code-button').unbind("click");
   var tooltip_text = 'Copy to clipboard';
   link.click(function(e){
+    var vhost = $(".universe-vhost-url").text();
     var txt = (universe == 'cran') ?
     `install.packages("${package}", repos = "https://cloud.r-project.org")` :
-    `install.packages("${package}", repos = c("https://${universe}.r-universe.dev", "https://cloud.r-project.org"))`;
+    `install.packages("${package}", repos = c("${vhost}", "https://cloud.r-project.org"))`;
     navigator.clipboard.writeText(txt).then(function(e){
       link.attr('data-bs-original-title', 'Copied!').tooltip('dispose').tooltip('show');
       link.attr('data-bs-original-title', tooltip_text);

views/pkginfo.pug

@@ -101,15 +101,13 @@ block content
                     span.package-details-gist-name #{Package}
                     span.pl-pds '
                   | ,
-                  span.pl-v repos
+                  span.pl-v  repos
                   span.pl-k  =
                   span.nocran
                     |  c(
                     span.pl-s
                       span.pl-pds '
-                      | https://
-                      span.title-universe-name #{universe}
-                      | .r-universe.dev
+                      span.universe-vhost-url https://#{vhost || `${universe}.r-universe.dev`}
                       span.pl-pds '
                     | ,
                   span.pl-s
@@ -360,4 +358,4 @@ block after_scripts
   script(src='https://cdnjs.cloudflare.com/ajax/libs/chartjs-plugin-annotation/3.0.1/chartjs-plugin-annotation.min.js')
   script(src='https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.30.1/moment.min.js')
   script(src='https://cdnjs.cloudflare.com/ajax/libs/chartjs-adapter-moment/1.0.1/chartjs-adapter-moment.min.js')
-  script(src='pkginfo.js?nocache=2')
+  script(src='pkginfo.js?nocache=3')