more configure options

configure.d/10-core.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 TITLE="Federated Computer Core"
-DESCRIPTION="Superpanel, Tailscale, Nextcloud, email and files"
+DESCRIPTION="Superpanel, Tailscale, Nextcloud, email, files and Element"
 
 # What you entered last time, so running this again only does what's missing
 CORE_CONF="$HOME/.config/coredesktop/core.conf"
@@ -15,6 +15,8 @@ core_names() {
   WEBDAV="$NEXTCLOUD/remote.php/dav/files/$CORE_USER"
   MOUNT="/mnt/$CORE_DOMAIN"
   SUPERPANEL_DESKTOP="$HOME/.local/share/applications/core-$CORE_DOMAIN-superpanel.desktop"
+  MATRIX="https://matrix.$CORE_DOMAIN"
+  ELEMENT_CONFIG="$HOME/.config/Element/config.json"
 }
 
 superpanel_done() {
@@ -40,10 +42,22 @@ files_done() {
   grep -qs " $MOUNT davfs " /etc/fstab && grep -qs "^$MOUNT " "$HOME/.davfs2/secrets"
 }
 
+element_installed() {
+  command -v element-desktop > /dev/null
+}
+
+# Done when Element isn't installed, as there's nothing to set up
+element_done() {
+  element_installed || return 0
+  jq -e --arg url "$MATRIX" \
+    '.default_server_config["m.homeserver"].base_url | rtrimstr("/") == $url' \
+    "$ELEMENT_CONFIG" &> /dev/null
+}
+
 is_configured() {
   [ -n "$CORE_DOMAIN" ] || return 1
   core_names
-  superpanel_done && tailscale_done && nextcloud_done && email_done && files_done
+  superpanel_done && tailscale_done && nextcloud_done && email_done && files_done && element_done
 }
 
 save_conf() {
@@ -255,6 +269,25 @@ EOF
   echo "Your Nextcloud files are at $MOUNT (\"$CORE_DOMAIN\" in the Files sidebar)."
 }
 
+# Element Desktop reads ~/.config/Element/config.json over its built-in
+# settings. Pointing it at the Core's Matrix server means you only choose
+# "Sign in" (the Core offers single sign-on through Authelia). The Core's Matrix
+# server is named after its address, matrix.<domain>, and says where its API is.
+setup_element() {
+  local base_url config
+  base_url="$(curl -sf --max-time 15 "$MATRIX/.well-known/matrix/client" \
+    | jq -r '.["m.homeserver"].base_url // empty' 2> /dev/null)"
+  base_url="${base_url:-$MATRIX}"
+
+  mkdir -p "$(dirname "$ELEMENT_CONFIG")"
+  config="$(cat "$ELEMENT_CONFIG" 2> /dev/null)"
+  [ -n "$config" ] || config='{}'
+  jq --arg url "${base_url%/}" --arg name "matrix.$CORE_DOMAIN" \
+    '.default_server_config = {"m.homeserver": {base_url: $url, server_name: $name}}' \
+    <<< "$config" > "$ELEMENT_CONFIG.tmp" && mv -f "$ELEMENT_CONFIG.tmp" "$ELEMENT_CONFIG" || return 1
+  echo "Element will use $MATRIX the next time it starts."
+}
+
 # Run a step unless it's done; a failed step doesn't stop the ones after it
 step() {
   local name="$1" title="$2"
@@ -310,6 +343,7 @@ run_configure() {
   step nextcloud "Nextcloud in Online Accounts"
   step email "Email in Online Accounts"
   step files "Nextcloud files at $MOUNT"
+  element_installed && step element "Element with your Core's Matrix server"
   unset PASSWORD APP_PASSWORD
   return $STATUS
 }