New config option: ``persistent_store``

Allows for using IndexedDB as the persistent store, instead of localStorage

CHANGES.md

@@ -8,8 +8,9 @@
 - New API [\_converse.api.headlines](https://conversejs.org/docs/html/api/-_converse.api.headlines.html#.get)
 - New config option [allow_message_retraction](https://conversejs.org/docs/html/configuration.html#allow-message-retraction)
 - New config option [muc-show-logs-before-join](https://conversejs.org/docs/html/configuration.html#muc-show-logs-before-join)
-- New config option [muc_mention_autocomplete_filter](https://conversejs.org/docs/html/configuration.html#muc_mention_autocomplete_filter)
-- New config option [muc_mention_autocomplete_show_avatar](https://conversejs.org/docs/html/configuration.html#muc_mention_autocomplete_show_avatar)
+- New config option [muc_mention_autocomplete_filter](https://conversejs.org/docs/html/configuration.html#muc-mention-autocomplete-filter)
+- New config option [muc_mention_autocomplete_show_avatar](https://conversejs.org/docs/html/configuration.html#muc-mention-autocomplete-show_avatar)
+- New config option [persistent_store](https://conversejs.org/docs/html/configuration.html#persistent-store)
 
 - Initial support for sending custom emojis. Currently only between Converse
   instances. Still working out a wire protocol for compatibility with other clients.

docs/source/configuration.rst

@@ -1349,6 +1349,23 @@ compile time.
 
 This configuration seting allows this value to be set at runtime as well.
 
+
+persistent_store
+----------------
+
+* Default: ``localStorage``
+* Valid options: ``localStorage``, ``IndexedDB``
+
+Determines which store is used for storing persistent data.
+
+From version 6.0.0 onwards, Converse supports storing data in
+`IndexedDB <https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API/Basic_Concepts_Behind_IndexedDB>`_.
+
+IndexedDB is not subjected to the same space constraints as localStorage and is
+also a requirement for progressive web apps which don't need persistent a
+internet connectivity to be functional.
+
+
 push_app_servers
 ----------------
 
@@ -1514,16 +1531,6 @@ everywhere.
 This warning isn't applicable to all deployments of Converse and can therefore
 be turned off by setting this config variable to ``false``.
 
-use_system_emojis
------------------
-* Default: ``true``
-
-Determines whether emojis should be rendered by the user's system.
-
-Not all operating systems support (all) emojis. So alternatively you can let
-Converse render the emojis with `Twemoji <https://twemoji.twitter.com/>`_.
-
-See also `emoji_image_path`_.
 
 send_chat_state_notifications
 -----------------------------
@@ -1635,8 +1642,7 @@ synchronize_availability
 ------------------------
 
 * Default: ``true``
-
-Valid options: ``true``, ``false``, ``a resource name``.
+* Valid options: ``true``, ``false``, ``a resource name``.
 
 This option lets you synchronize your chat status (`online`, `busy`, `away`) with other chat clients. In other words,
 if you change your status to ``busy`` in a different chat client, your status will change to ``busy`` in Converse as well.
@@ -1651,8 +1657,7 @@ theme
 -----
 
 * Default: ``default``
-
-Valid options: ``default``, ``concord``
+* Valid options: ``default``, ``concord``
 
 Let's you set a color theme for Converse.
 
@@ -1706,6 +1711,18 @@ description of time-format options available for ``DayJS`` you can check the
 `default formatting options <https://github.com/iamkun/dayjs/blob/dev/docs/en/API-reference.md#displaying>`_ and the
 `advanced options <https://github.com/iamkun/dayjs/blob/master/docs/en/Plugin.md#advancedformat>`_.
 
+use_system_emojis
+-----------------
+* Default: ``true``
+
+Determines whether emojis should be rendered by the user's system.
+
+Not all operating systems support (all) emojis. So alternatively you can let
+Converse render the emojis with `Twemoji <https://twemoji.twitter.com/>`_.
+
+See also `emoji_image_path`_.
+
+
 visible_toolbar_buttons
 -----------------------
 

src/headless/converse-core.js

@@ -268,6 +268,7 @@ _converse.default_settings = {
     message_carbons: true,
     nickname: undefined,
     password: undefined,
+    persistent_store: 'localStorage',
     priority: 0,
     rid: undefined,
     root: window.document,
@@ -448,10 +449,11 @@ function initClientConfig () {
      * user sessions.
      */
     const id = 'converse.client-config';
+    const store_map = { 'localStorage': 'local', 'IndexedDB': 'indexed' };
     _converse.config = new Backbone.Model({
         'id': id,
         'trusted': _converse.trusted && true || false,
-        'storage': _converse.trusted ? 'local' : 'session'
+        'storage': _converse.trusted ? store_map[_converse.persistent_store] : 'session'
     });
     _converse.config.browserStorage = _converse.createStore(id, "session");
     _converse.config.fetch();