basic import/export for localStorage, needs to be polished

.gsoc/todo.txt

@@ -4,3 +4,5 @@ check input escaping, $cfg is no longer safe to use
 
 preference:
 - synchronize language, theme ThemeDefault
+
+allow to import ThemeDefault

js/config.js

@@ -664,9 +664,49 @@ $(function() {
             disabled = true;
         }
         form.find('input[type=submit]').attr('disabled', disabled);
+    }).submit(function(e) {
+        var form = $(this);
+        if (form.attr('name') == 'prefs_export' && $('#export_local_storage')[0].checked) {
+            e.preventDefault();
+            // use AJAX to read JSON settings and save them
+            savePrefsToLocalStorage(form);
+        } else if (form.attr('name') == 'prefs_import' && $('#import_local_storage')[0].checked) {
+            // set 'json' input and submit form
+            form.find('input[name=json]').val(window.localStorage['config']);
+        }
     });
 });
 
+/**
+ * Saves user preferences to localStorage
+ *
+ * @param {Element} form
+ */
+function savePrefsToLocalStorage(form)
+{
+    form = $(form);
+    var submit = form.find('input[type=submit]');
+    //PMA_messages['strPrefsSaved']
+    submit.attr('disabled', true);
+    $.ajax({
+        url: 'prefs_manage.php',
+        cache: false,
+        type: 'POST',
+        data: {
+            token: form.find('input[name=token]').val(),
+            submit_get_json: true
+        },
+        success: function(response) {
+            window.localStorage.setItem('config', response.prefs);
+            $('.localStorage-empty').hide();
+            $('.localStorage-exists').show();
+        },
+        complete: function() {
+            submit.attr('disabled', false);
+        }
+    });
+}
+
 //
 // END: User preferences import/export
 // ------------------------------------------------------------------

prefs_manage.php

@@ -28,6 +28,11 @@ if (isset($_POST['submit_export']) && filter_input(INPUT_POST, 'export_type') ==
     $settings = PMA_load_userprefs();
     echo json_encode($settings['config_data']);
     return;
+} else if (isset($_POST['submit_get_json'])) {
+    $settings = PMA_load_userprefs();
+    header('Content-Type: application/json');
+    echo json_encode(array('prefs' => json_encode($settings['config_data'])));
+    return;
 } else if (isset($_POST['submit_import'])) {
     // load from JSON file
     $json = '';
@@ -117,6 +122,11 @@ $GLOBALS['js_include'][] = 'config.js';
 require_once './libraries/header.inc.php';
 require_once './libraries/user_preferences.inc.php';
 ?>
+<script type="text/javascript">
+<?php
+PMA_printJsValue("PMA_messages['strPrefsSaved']", __('Settings have been saved'));
+?>
+</script>
 <div id="maincontainer">
     <div id="main_pane_left">
         <div class="group">
@@ -126,6 +136,7 @@ require_once './libraries/user_preferences.inc.php';
                 echo PMA_generateHiddenMaxFileSize($max_upload_size) . "\n";
                 echo PMA_generate_common_hidden_inputs() . "\n";
                 ?>
+                <input type="hidden" name="json" value="" />
                 <div style="padding-bottom:0.5em">
                     <input type="radio" id="import_text_file" name="import_type" value="text_file" checked="checked" />
                     <label for="import_text_file"><?php echo __('Import from text file') ?></label>
@@ -184,7 +195,7 @@ require_once './libraries/user_preferences.inc.php';
         </div>
         <div class="group">
             <h2><?php echo __('Reset') ?></h2>
-            <form class="group-cnt prefs-form" name="prefs_export" action="prefs_manage.php" method="post">
+            <form class="group-cnt prefs-form" name="prefs_reset" action="prefs_manage.php" method="post">
             <?php echo PMA_generate_common_hidden_inputs() . "\n" ?>
                 <?php echo __('You can reset all your settings and restore them to default values') ?>
                 <br /><br />