Add Attic disclaimer

Dockerfile

@@ -1,6 +1,6 @@
 # Docker image that serves static content via NGINX, with autoindex enabled.
 FROM nginx:alpine
-MAINTAINER XSF Editors <[email protected]>
+LABEL org.opencontainers.image.authors="[email protected]"
 COPY deploy/nginx.vh.default.conf /etc/nginx/conf.d/default.conf
 COPY content /usr/share/nginx/html
 RUN rm /usr/share/nginx/html/index.html

README.md

@@ -1,4 +1,13 @@
-[![Docker Build Status](https://img.shields.io/docker/build/xmppxsf/xep-attic.svg)](https://hub.docker.com/r/xmppxsf/xep-attic/)
-
 # xep-attic
-Archive of old XEP versions, as published on [www.xmpp.org/extensions/attic/](https://www.xmpp.org/extensions/attic/)
+
+Archive of old XEP versions, as published on [xmpp.org/extensions/attic/](https://xmpp.org/extensions/attic/)
+
+## Building
+
+```shell
+sudo docker build -t xep-attic:latest .
+```
+
+```shell
+sudo docker run -t -p 80:80 xep-attic:latest
+```

content/attic.css

@@ -0,0 +1,12 @@
+#attic_notice {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    margin: 0;
+    padding: 1em;
+    opacity: 0.95;
+    background-color: #ff8f2c;
+    color: #282828;
+    font-family: sans-serif;
+}

content/attic.js

@@ -0,0 +1,23 @@
+document.addEventListener("DOMContentLoaded", function () {
+  const notice = document.createElement("div");
+  notice.id = "attic_notice";
+  document.getElementsByTagName("body")[0].prepend(notice);
+
+  const noticeText = document.createElement("strong");
+  const link = document.createElement("a");
+  notice.append(noticeText);
+  notice.append(link);
+
+  if (window.location.pathname === "/extensions/attic/") {
+    noticeText.innerHTML = "Beware: You are browsing archived versions of XEPs. ";
+    link.innerText = "Browse latest versions";
+    link.href = `${window.location.protocol}//${window.location.host}/extensions/`
+  } else {
+    noticeText.innerHTML =
+      "Beware: The content that is displayed here is an archived version of the document, that has been updated. ";
+
+    const xepNumber = window.location.pathname.match(/\d{4}/)[0];
+    link.innerText = "View latest version";
+    link.href = `${window.location.protocol}//${window.location.host}/extensions/xep-${xepNumber}.html`;
+  }
+});

deploy/nginx.vh.default.conf

@@ -8,6 +8,9 @@ server {
     location / {
         autoindex on;
         root   /usr/share/nginx/html;
+        proxy_set_header Accept-Encoding "";
+        sub_filter '</head>' '<script src="/attic.js"></script><link rel="stylesheet" href="/attic.css"></head>';
+        sub_filter_once on;
         #index  index.html index.htm;
     }