web,etherpad: add etherpad addon for sharing document

web/rootfs/defaults/meet.conf

@@ -32,3 +32,19 @@ location /http-bind {
     proxy_set_header X-Forwarded-For $remote_addr;
     proxy_set_header Host {{ .Env.XMPP_DOMAIN }};
 }
+
+{{ if .Env.ETHERPAD_URL_BASE }}
+# Etherpad-lite
+location /etherpad/ {
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection 'upgrade';
+    proxy_set_header Host $host;
+    proxy_cache_bypass $http_upgrade;
+
+    proxy_pass {{ .Env.ETHERPAD_URL_BASE }}/;
+    proxy_set_header X-Forwarded-For $remote_addr;
+    proxy_buffering off;
+    proxy_set_header Host {{ .Env.XMPP_DOMAIN }};
+}
+{{ end }}

web/rootfs/etc/cont-init.d/10-config

@@ -72,6 +72,12 @@ if [[ ! -f /config/config.js ]]; then
             -e "s#// authdomain:.*#authdomain: '${XMPP_DOMAIN}',#" \
             /config/config.js
     fi
+
+    if [[ ! -z "${ETHERPAD_URL_BASE}" && -z "$(grep -om1 'etherpad_base:' /config/config.js)" ]]; then
+        sed -i \
+            -e "/enableWelcomePage/a\    etherpad_base: '/etherpad/p/'," \
+            /config/config.js
+    fi
 fi
 
 if [[ ! -f /config/interface_config.js ]]; then